JST Connectors Explained: 2-Pin Types, Identification & Cable Buying Guide

If you've ever searched for JST 2 pin connector types and ended up staring at a photo of a different tiny white connector, this article is for you. In my role, I help electronic manufacturers source JST connectors on tight deadlines. Last quarter alone, we handled 47 rush orders with a 95% on-time rate. The biggest source of delay wasn't freight. It was not knowing which JST series the customer actually needed.

Here is a practical FAQ that covers JST company overview, JST 2-pin connector types, JST connector identification, cable questions, and the Cisco vs JST question that keeps appearing in searches.

JST Company Overview: Who Actually Makes JST?

JST is short for J.S.T. Mfg. Co., Ltd., a Japanese company founded in Osaka in 1957. The initials stand for Japan Solderless Terminal. According to JST's official corporate history at jst.com, the company began by manufacturing solderless terminals and then grew into a major connector manufacturer.

This background matters because JST is not one part. It is a company with dozens of connector series. When someone says I need a JST, they almost always mean a JST series like PH, SH, XH, or VH. Naming the manufacturer is only the beginning of the specification.

JST 2-Pin Connector Types: PH, XH, VH, and More

A JST 2-pin connector is usually a wire-to-board connector system. It has a female housing that latches onto a male header. Within that system, the series determines the pitch, terminal size, and current capability.

These are the series I see most often when someone asks about 2-pin JST connectors:

• SH (1.0 mm pitch) - tiny signal-level connector used in small battery packs and compact circuit boards.
• ZH (1.5 mm pitch) - compact connector used in cameras, alarms, and other space-limited products.
• PH (2.0 mm pitch) - the connector many people actually call JST; common in LED, drone, and consumer electronics applications.
• XH (2.5 mm pitch) - a larger pitch version popular in battery packs and RC charging leads.
• VH (3.96 mm pitch) - a heavier connector for power supplies and AC/DC input cables.

Within each series, you also have male headers, female housings, crimp terminals, and pre-crimped leads. So a complete request should say JST PH 2-pin female housing with contacts, not just JST 2 pin.

JST Connector Identification: How to Tell Them Apart Quickly

The best first step is not a photo. It's a measurement.

1. Measure pitch. Use digital calipers to measure from center of the first pin to center of the second. JST pitches are commonly 1.0, 1.5, 2.0, 2.5, or 3.96 mm.
2. Count pins and decide connector side. A 2-pin connector can be the board-mount header or the cable-side housing.
3. Look at the locking tab profile. Compare it side-by-side with official datasheet drawings from JST.
4. Check for markings. Some housings or headers have series marks; often not. Do not assemble from a low-res photo alone.

To be honest, I learned this the hard way. Early in my career, I approved a 5,000-piece rush order based on photos and sent a customer JST XH housings when they needed PH. The pitch difference was 0.5 mm. The order had to be redone. After that, I stopped guessing and started treating every unknown connector as an unknown until I measured it.

What Cable Should I Use with JST 2-Pin Connectors?

JST connectors do not come with a cable unless you order a cable assembly. A cable assembly is made from three pieces: housing, crimp contacts, and wire. The contact is the piece that decides what wire size fits.

For a small 2-pin PH cable, 26 or 28 AWG stranded wire is common. For larger XH and VH connectors, the approved wire sizes are generally larger, but always check the specific terminal's crimp range. Do not force oversized wire into the barrel, and do not use undersized wire and expect the crimp to hold.

Use stranded wire with a proper crimp. Soldered wire inserted into a connector works for a quick bench prototype, but solder wicks and stiffens the wire, and that becomes a failure point in a moving cable.

What About Cisco vs JST?

I have to address this because those two terms end up in the same search query more often than you might think. Cisco and JST are not competitors. Cisco builds network equipment; JST builds connectors. They solve different problems.

Where this gets practical is a replacement cable. Cisco console ports normally use RJ45 or USB connections, not a JST 2-pin connector. JST connectors may show up inside network gear for fans or power boards, but those are internal component-level connections and Cisco does not specify them as standard user cables.

If a machine or switch has a small connector that looks like a JST, do not buy a cable based on the Cisco device name alone. Match the connector series, count the pins, and check pinout. The device brand will not tell you which 2-pin connector is on the other end.

Why Choose a Genuine JST Connector?

There are cheaper connectors on the market that look like JST PH or XH. Some are fine for a one-off prototype. I do not recommend them when the final product has a compliance test or a warranty period.

An original JST connector is manufactured to a defined specification: plastic material, terminal material, retention force, and temperature rating. A copy can look similar but fail in ways that do not show up on day one. The failure I have seen most often in low-cost imitation parts is loose terminal retention.

And here is where I land on time certainty: in a production emergency, the difference between a genuine connector and an unknown clone is not the price. It is the probability of a second failure. Buying very cheap connectors to save on a $2,000 downtime risk is false economy.

Rush Order for JST: Can You Get It Fast?

Yes, if the specification is confirmed before you speed up delivery. In March 2024, a client called at 3 p.m. with a stopped production line. They needed a JST PH 2-pin cable assembly with a specific wire length by the next morning. Standard lead time was five days. We confirmed the drawing, paid a rush fee for an overnight build, and delivered it before the client's shift started. The rush fee was roughly $250; the missed production time would have been far more expensive.

That is why I keep saying identify first, expedite second. If a customer says just 2-pin JST and asks for overnight shipping, the first task is to ask more questions. A rushed but wrong connector is worse than a slightly slower but correct one. Once the part is known, pay for certainty. In a deadline, a probably-will-fit connector is the biggest risk you can take.