# Adafruit STEMMA to Male Headers 200 mm

> Adafruit 3955 STEMMA cable, 200 mm: JST PH 4-pin (2 mm pitch, STEMMA I2C) on one end and 4 × 0.1″ male header plugs on the other; wires black GND, red V+, white SDA, green SCL. Breaks a STEMMA port out to a breadboard or socket header; the JST PH plug also fits a Seeed Grove socket with matching wires.

- Manufacturer: Adafruit Industries
- Part number: 3955
- Category: Cables & harnesses
- Canonical page: https://www.xirkit.io/products/adafruit-stemma-to-male-headers-200-mm-3ec9
- Pinout: https://www.xirkit.io/products/adafruit-stemma-to-male-headers-200-mm-3ec9/pinout
- Structured JSON: https://www.xirkit.io/products/adafruit-stemma-to-male-headers-200-mm-3ec9/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Cable type | adapter |
| Ecosystem | STEMMA (JST PH) / Grove-compatible |
| Connector A | JST PH 4-pin, 2 mm pitch (STEMMA) |
| Connector B | 4 × 0.1″ male header plugs |
| Conductors | 4 |
| Connector pitch | 2 mm |
| Length | 200 mm |

## Pinout (4 pins, 0 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| SCL | PH-1 | i2c scl | — | scl | — | — | — | — | — | — | — |
| SDA | PH-2 | i2c sda | — | sda | — | — | — | — | — | — | — |
| V+ | PH-3 | power | — | v+ | — | — | — | — | — | — | — |
| GND | PH-4 | ground | — | ground | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| www.adafruit.com | 1.5 USD | in_stock | 2026-10-01 | https://www.adafruit.com/product/3955 |

## FAQ

**How much does the Adafruit STEMMA to Male Headers 200 mm cost?**

From $1.5 at www.adafruit.com. Prices are observed unit prices before tax and shipping.

**Where does this Adafruit STEMMA to Male Headers 200 mm data come from?**

Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.

## Sources

- [Adafruit STEMMA to Male Headers 200 mm datasheet](https://www.adafruit.com/product/3955)
- [www.adafruit.com listing](https://www.adafruit.com/product/3955)

## Part graph

### Alternatives (by use case)

- [Adafruit Grove to STEMMA QT Cable 100 mm](https://www.xirkit.io/products/adafruit-grove-to-stemma-qt-cable-100-mm-b07f) — Both serve robot wiring and sensor chains — check the trade-offs; $1.95 vs $1.5
- [Adafruit JST PH to JST SH Cable 200 mm (STEMMA to QT)](https://www.xirkit.io/products/adafruit-jst-ph-to-jst-sh-cable-200-mm-stemma-to-qt-108e) — Both serve robot wiring and sensor chains — check the trade-offs; $1.5 vs $0.95
- [Adafruit STEMMA QT Cable 300 mm (JST SH 4-pin)](https://www.xirkit.io/products/adafruit-stemma-qt-cable-300-mm-jst-sh-4-pin-552f) — Both serve robot wiring and sensor chains — check the trade-offs; $1.5 vs $1.25
- [Adafruit QT to Female Sockets 150 mm (STEMMA QT)](https://www.xirkit.io/products/adafruit-qt-to-female-sockets-150-mm-stemma-qt-5bb4) — Both serve robot wiring and sensor chains — check the trade-offs; $1.5 vs $0.95
- [Adafruit STEMMA QT Cable 50 mm (JST SH 4-pin)](https://www.xirkit.io/products/adafruit-stemma-qt-cable-50-mm-jst-sh-4-pin-6d1b) — Both serve robot wiring and sensor chains — check the trade-offs; $1.5 vs $0.95
- [Adafruit STEMMA QT Cable 400 mm (JST SH 4-pin)](https://www.xirkit.io/products/adafruit-stemma-qt-cable-400-mm-jst-sh-4-pin-8edd) — Both serve robot wiring and sensor chains — check the trade-offs; $1.5 vs $1.5
- [Adafruit STEMMA QT Cable 100 mm (JST SH 4-pin)](https://www.xirkit.io/products/adafruit-stemma-qt-cable-100-mm-jst-sh-4-pin-c913) — Both serve robot wiring and sensor chains — check the trade-offs; $1.5 vs $0.95
- [Adafruit STEMMA to Female Sockets 200 mm](https://www.xirkit.io/products/adafruit-stemma-to-female-sockets-200-mm-f0d7) — Both serve robot wiring and sensor chains — check the trade-offs; $1.5 vs $1.5
- [Adafruit STEMMA QT Cable 200 mm (JST SH 4-pin)](https://www.xirkit.io/products/adafruit-stemma-qt-cable-200-mm-jst-sh-4-pin-f7bb) — Both serve robot wiring and sensor chains — check the trade-offs; $1.5 vs $1.25
- [SparkFun Flexible Qwiic Cable 500 mm](https://www.xirkit.io/products/sparkfun-flexible-qwiic-cable-500-mm-a6c2) — Both serve robot wiring and sensor chains — check the trade-offs; $2.75 vs $1.5