There are two questions hiding in that one, and they have different answers.
The naming question is settled by a single measurement. The DF13 is a 1.25mm pitch wire-to-board crimping connector from Hirose Electric. The DF12 is a different Hirose series designation — not the same family, not the same mating interface. A drawing or a purchase order that says "DF12" while describing a 1.25mm crimp wire-to-board connector has the wrong series written on it, and the intended series is almost always the DF13.
The sourcing question depends on three things — your position count, your row count, and your current per contact. Pitch alone does not answer it, and neither does "we need a 1.25mm equivalent".
I work on connector and harness programmes at KONNRA, which publishes a documented cross-reference to this series (the KR1256). Here is what actually decides the answer.
Why the DF12 slip happens, and how to close it in thirty seconds
The mix-up is not carelessness. Three things cause it:
- The designations are one digit apart, and both belong to Hirose's "DF" numbering block. DF12, DF13, DF14, DF19 and DF20 all sit inside the same block, and the numbers were issued as the series were developed rather than as a mnemonic system.
- The two names travel together in the same documents. Hirose's own catalogue and distributor listings interleave the DF series, so a search for "DF12" returns DF13 material and vice versa, and the wrong digit gets copied into a BOM.
- The DF13 is very often the part someone is actually holding. It is one of the highest-volume 1.25mm crimp families in the world, so when a drawing says DF12 and the physical part is a 1.25mm crimp connector, DF13 is the usual intended answer.
How to settle it without documentation:
- Measure the contact pitch — centre-to-centre between adjacent contacts. 1.25mm points at the DF13 class. Any pitch other than 1.25mm rules the DF13 out entirely.
- Count the rows. The DF13 is offered in 1 or 2 rows. A single-row 1.25mm crimp family in this block is also DF13 territory.
- Count the positions. The DF13 series listing covers 2–15, plus 20, 30 and 40. A count outside that set needs the original series page opened, not a guess.
- Look at the mating half. A DF13 header on the board takes a socket housing with a crimped contact. If the mating half is a flat cable, a board-to-board stack, or a different pitch, it is a different series.
- Read the marking or the reel label. The full part number is the only thing that identifies a series with certainty.
Rule of thumb: at 1.25mm and 1.0mm pitch, cross-reference on the part number, never on the pitch or the appearance. DF12, DF13, DF14, DF19, DF20, DF50, JST GH, JST SH and Molex PicoBlade all live within a fraction of a millimetre of each other, and none of them mate with any other.
What the DF13 actually is
The DF13 is a 1.25mm pitch miniature crimping connector for wire-to-board connections, positioned by Hirose inside its SignalBee™ range of signal connectors. Hirose's own summary of the series is short and functional: compact size, multi-contact, pick-and-place mounting, basic functionality at a small size, and UL certification.
It is a crimp family, and that word carries most of the engineering. The board-mounted half is a header — a wafer that is either through-hole (THT) or surface-mount (SMT), in straight or right-angle orientation. The cable-side half is a socket housing that receives a crimped contact on a discrete wire. There is no insulation-displacement path and no flat-cable path: the DF13 terminates discrete wire only, and it does so by crimping.
Documented series parameters, from Hirose's own DF13 pages:
- Contact pitch and mounting pitch: 1.25mm — the same figure for both
- One or two rows — the series page lists the number of rows (interface) as 1 and 2
- Positions: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20, 30 and 40
- Rated current: 1.0A and 2.5A across the series (more on this below — it is the row most people misread)
- Rated voltage: AC 150.0V and DC 150.0V
- Mounting: SMT and THT, in straight and right-angle orientation
- Standard on-board mounting side, with soldering as the PCB stabilising feature and no staggered lead
- Connector envelope across the series: heights 3.4mm to 5.4mm, widths 3.2mm to 5.5mm, lengths 4.15mm to 30.85mm
- Mating/unmating: 30 or 50 cycles, depending on variant
- Plating: gold or tin, at 0.2μm, 0.76μm or 1.0μm
- Wire: discrete wire, recommended sizes spanning AWG 26 to AWG 32
- Operating temperature: −35°C to +85°C
- Safety standard: UL
The half is named differently on this series, and it catches people
If you come to the DF13 from the DF19 or the JST SH world expecting "receptacle" and "plug", you will mis-map the halves.
- Header — the board-mounted half. Header part numbers carry a
P. Hirose lists headers in SMT and THT, in straight and right-angle orientation. - Socket — the cable-side housing. Socket part numbers carry an
S. The socket receives crimped contacts. This is the half the DF19 calls a "plug" and the JST SH world calls a "housing". - Contact — the crimp terminal. Hirose lists it as its own connector type alongside header and socket, which is the tell that this is a crimp family: the terminal is a separately ordered line item, not a pre-fitted part.
On the second-source side the same three parts are called a wafer, a housing and a terminal. The mapping is mechanical — headers become wafers, sockets become housings, contacts become terminals — but the words do not agree, and a harness drawing that says "plug" on a DF13 build will be read as a socket by one person and as something else by the next.
How a confirmed DF13 part number reads: take DF13 - 2 S - 1.25 C. DF13 is the series. 2 is the position count. S is a socket — a P in that position denotes a header, the board-mounted half. 1.25 is the contact pitch. C is crimp termination for discrete wire.
What is not documented at series level: the suffix that distinguishes a straight header from a right-angle one, and an SMT header from a THT one. That lives in the individual part numbers and the series catalogue. Confirm it against the catalogue before you commit a footprint — on this series a wrong suffix is a wrong footprint, and a wrong footprint is a scrapped board.
Where a DF13 cross-reference is strong, and where it stops
This is the part that decides whether a second source is a drop-in or a redesign. Four points, in the order they usually bite.
1. The rated current is a dual figure on one side and a single figure on the other. Hirose's DF13 series page lists 1.0A and 2.5A; Hirose's part page for DF13-2S-1.25C — a 2-position socket housing — lists 2.5A for that specific part. The second source documents its equivalent at 1A.
Neither figure is wrong. They are published against different part numbers, and the safe reading is that 1A is the figure you can rely on across the second-source range, while 2.5A exists on the Hirose side for specific low-position parts. If your design draws more than 1A, this is the first thing to settle, and it has to be settled against your specific position count and part number — not against the series headline.
2. Position counts are described as a set on one side and a range on the other — and on the dual-row side they are not the same thing. Hirose publishes a flat position set: 2 through 15, then 20, 30 and 40, without stating which counts are single row and which are dual row. The second source publishes a range: 2–15 positions in single row, and 2×5 to 2×20 positions in dual row, which describes a continuous span of per-row counts.
The single-row spans are equivalent. The dual-row descriptions are not:
- A 2×10 dual-row socket is 20 circuits, which corresponds to Hirose's 20.
- 2×15 corresponds to 30.
- 2×20 corresponds to 40.
- But a continuous 2×5 to 2×20 range also implies intermediate configurations — 2×6, 2×7, 2×8 and so on — which do not appear in the Hirose series position set.
If your build calls for an intermediate dual-row count, confirm availability in writing rather than assuming a continuous range on either side.
3. The second-source temperature range is wider than the original's, and that is a question, not a bonus. Hirose specifies −35°C to +85°C. The KR1256 is documented at −40°C to +105°C — 5°C wider at the bottom and 20°C wider at the top. A wider declared range on a second source is normal; if your application genuinely relies on operation above +85°C, request the test data behind the figure rather than accepting the headline range, because that is what your design review will be asked for.
4. Contact plating is described in different terms, and only one side publishes a thickness. Hirose documents gold or tin at 0.2μm, 0.76μm or 1.0μm. The KR1256 documents gold flash / tin over nickel with no micron figure. Gold flash is a thin gold deposit, and Hirose's thinnest documented option is 0.2μm — so the two descriptions are not interchangeable and cannot be compared without a number. If contact finish is part of your qualification, ask for the plating thickness in microns.
Three more gaps worth knowing before you release a drawing
- Mating durability is published on the Hirose side and not on the second-source side. Hirose documents 30 or 50 cycles depending on variant; the KR1256 does not publish a cycle count. On a 1.25mm crimp interface this matters less than it does on a display connector — the mating half is usually a harness fitted once — but if your service model involves re-mating, ask for the figure.
- Applicable wire is specified two different ways. Hirose specifies a wire type — discrete wire, AWG 26 to AWG 32, with a Ø0.6±0.03 dimension in its catalogue material. The KR1256 specifies an outer dimension instead: insulation O.D. 1.0mm max, with no gauge or conductor construction listed. A 1.0mm ceiling is generous — wider than most cable that would crimp reliably into a 1.25mm contact — so pin the accepted conductor size and insulation diameter to your own assembly drawing rather than working to the ceiling. The practical rule: choose the wire from the gauge side (stay inside AWG 26 to AWG 32), then verify the jacket also satisfies the 1.0mm maximum.
- The mechanical envelope is published on one side only. Hirose documents heights of 3.4mm to 5.4mm, widths of 3.2mm to 5.5mm and lengths of 4.15mm to 30.85mm. The second-source product page does not publish an envelope dimension. The envelope governs board stacking, cable bend clearance and whether the connector fits under a cover, so it has to come from the engineering drawing before the footprint is released.
One honest note about all of this. Every "not documented" above is a gap in the documentation reviewed, not a statement that the property does not exist. Hirose publishes a DF13 specification sheet with the full electrical and mechanical tables, and KONNRA publishes a KR1256 specification PDF. Rather than fill the open cells from a third-party aggregator, they are left open.
What the second source actually covers
The KR1256 series is documented against the Hirose DF13 interface at 1.25mm pitch, and it is not a single part — it is a small configuration space: two board-mounting technologies, two wafer orientations, one or two rows, and a housing and terminal to match. Eight components are published against the series:
- DIP single-row right-angle wafer — through-hole header, cable exits parallel to the board
- DIP single-row straight wafer — through-hole header, cable exits perpendicular to the board
- SMT single-row right-angle wafer — surface-mount header, cable parallel to the board
- SMT single-row straight wafer — surface-mount header, cable perpendicular to the board
- SMT dual-row straight wafer — surface-mount dual-row header
- Single-row housing — cable-side socket for 2–15 positions
- Dual-row housing — cable-side socket for 2×5 to 2×20 positions
- Terminal — crimp contact for discrete wire
That split mirrors the way Hirose divides the family into header, socket and contact. What does not map mechanically is the footprint: the wafer geometry has to be checked against the Hirose header footprint position by position, and that is the single most common reason a first-article build fails.
Documented KR1256 general specifications: pitch 1.25mm; 1A; 150V; withstanding voltage 500V AC / minute; contact resistance 30mΩ max; insulation resistance 500MΩ min; insulation O.D. 1.0mm max; temperature range −40°C to +105°C; materials PA66 / UL94 / PA6T / Phosphor Bronze / Brass; plating gold flash / tin over nickel; RoHS compliant.
Two things on the KR1256 that Hirose's page does not state: the series is described as supporting automatic mounting, as using an anti-skew box structure to avoid mis-insertion, and as having a friction locking mechanism to hold the mated connection under vibration or shock. Hirose lists pick-and-place mounting as a DF13 series feature and states there is no staggered lead — so the two descriptions agree in substance on automatic assembly, while the locking and anti-skew features are the second source's own characterisation of the part.
A note on the withstanding voltage figure, since it is the one place where a number can look like a mistake and is not: 500V AC / minute against a 150V rated voltage is a factor of about 3.3, which is the shape of a genuine dielectric-withstand test rather than a rating copied into the wrong field. The same 500V AC / minute figure appears in KONNRA's documentation for its KR1002 series, the Hirose DF19 equivalent — which suggests a common dielectric-withstand test applied across its small-pitch ranges rather than a series-specific measurement. That is fine, as long as your design review knows it.
Design notes that account for most field problems
A 1.25mm crimp connector is a mature part, and the failures that reach a customer are almost never electrical. They are mechanical and process-related, and they cluster in five places.
Do not assume the series letter tells you the mating geometry. The DF13 and the DF14 are both 1.25mm, and neither mates with the other. In the cross-reference range the DF13 is KR1256, the DF14 is KR1255, and the DF14 with a lock is KR1258 — three separate part families, three separate mating geometries. A quotation that offers "a 1.25mm equivalent" without naming which of the three it is has not answered the question.
Crimp quality is a tooling question, not a wire question. The DF13 terminates by crimping, and Hirose lists contact as a separate connector type — meaning the terminal is ordered as its own line item and installed with its own tooling. If you build harnesses in house, ask which applicator and press the terminal is validated against before you buy a reel of contacts. If you buy finished assemblies, the tooling question becomes your supplier's, and it is worth asking directly, because it is the difference between a harness vendor and an assembly bench.
The friction lock holds the connector, not the wire. Three consequences: route the harness so a technician can get a grip on the socket and pull it squarely; leave a strain-relief loop, because a straight taut run from the socket into a cable tie puts every pull force into the crimp; and do not rely on the lock alone in a shock environment — lock plus a cable tie to the board is the combination that survives.
Check polarisation on the drawing. The anti-skew box structure guides the socket home rather than relying on the operator to align it, which is a genuine process benefit — but a harness built with reversed orientation will still physically fit some designs. Confirm which way round the socket goes before the harness is released.
Take the footprint and the reflow profile from the drawing, not the product page. Right-angle wafers put the cable along the board and are the right answer when the harness has to travel across the board or exit through a side wall; straight wafers put the cable perpendicular to the board and need enough height above the connector for the cable's minimum bend radius. The product page does not publish an envelope dimension; the drawing does. The same applies to the soldering profile for the SMT wafer, which is not documented on the product page either.
What the DF13 is not for. It is not a power connector. The series is documented at 1.0A and 2.5A, and the second-source side at 1A — so it carries signal and modest supply current, not motor, heater or lighting loads. If your design needs materially more than 1A across the range, the answer is a larger pitch class, not a different DF13 variant. And because the series terminates discrete wire only, it is not the part for a flat-cable link or a board-to-board stack.
What to send for a cross-reference check
Most DF13 sourcing enquiries stall on the same thing: the buyer is not sure what information the supplier needs, so the enquiry never gets sent. This is the complete list.
- The original part number, if you have it — for example
DF13-2S-1.25C, or the full header part number including its suffix - Position count, and whether it is single row (2–15) or dual row (2×5 to 2×20)
- Row count — one or two; the series is offered in both, and the two are different hardware
- Wafer orientation and mounting technology — straight or right angle, and DIP (through-hole) or SMT
- Wire specification — gauge, strand construction and jacket diameter
- Current per contact — especially if your design draws more than 1A
- Application, annual volume, and whether you buy connectors or finished harnesses
- A drawing or photo, if the part number is unreadable, the design has been reverse-engineered, or the note says DF12 and you need it resolved to a series
When you send a part number, three things get confirmed against Hirose's own documentation: the applicable current rating for your specific part number and wire, the mounting footprint your wafer geometry corresponds to, and whether your row count and position count are covered. Those are the three places a DF13 cross-reference most often goes wrong.
What you get back: a mapped KR1256 part number with the relevant product and engineering drawings, a specification comparison against your original part, and a sample and quote plan.
And take a photo if you are stuck. On a 1.25mm pitch part a photo next to a ruler identifies the pitch reliably; the part number identifies the series. If your drawing says DF12, mention it — it is resolvable from the pitch alone.
About KONNRA
Dongguan Konnra Electronics Co., Ltd. (brand: KONNRA) was founded in 2004 and is a National High-Tech Enterprise specialising in connector and wiring harness research, development, production and sales. Manufacturing is vertically integrated — precision mould design and manufacturing, precision injection moulding, stamping, assembly and CCD visual inspection — with automation coverage exceeding 95% across production lines. Testing runs through a CNAS-accredited laboratory with 45+ sets of precision testing instruments.
Quality systems: ISO9001, ISO14001, IATF16949, ISO45001:2018, ISO13485, IPC620, and UL product and operational safety certifications, with automotive-grade series additionally certified to LV214 and US CAR-2. Complete connector set samples can be delivered within 45 days; connector production lead time is typically 2–3 weeks and wiring harness lead time typically 3–4 weeks. Harness assemblies are built in the standard configurations — single-headed, same-side-head, reverse-side-head, and adapter or transition harnesses where one board uses a DF13 header and the far end does not match.
Contact KONNRA Electronics
- Phone: (86)-769-85449875
- Email: info@konnra.com
- Address: No.6 Nanchang South Road, Chijiao, Wangniudun, Dongguan, Guangdong, China
- Contact us
View the KONNRA KR1256 Hirose DF13 Equivalent
https://konnra.com/hirose-df13-connector-complete-guide/
Dongguan Konnra Electronics Co., Ltd
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