# BM04B-SRSS-TB

**JST Sales America** · Wire To Board Connector · JST_SH_BM04B-SRSS-TB_1x04-1MP_P1.00mm_Vertical

BM04B-SRSS-TB from JST Sales America, in a JST_SH_BM04B-SRSS-TB_1x04-1MP_P1.00mm_Vertical. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | 1 | passive | Circuit No. 1 contact of the 1.0 mm pitch SMT header, marked 'No. 1 circuit' in the drawing, rated 0.7 A AC/DC and 50 V AC/DC. |
| 2 | 2 | passive | Circuit 2 contact at 1.0 mm pitch from pin 1, rated 0.7 A AC/DC and 50 V AC/DC. |
| 3 | 3 | passive | Circuit 3 contact at 1.0 mm pitch from pin 2, rated 0.7 A AC/DC and 50 V AC/DC. |
| 4 | 4 | passive | Circuit 4 contact at 1.0 mm pitch from pin 3, rated 0.7 A AC/DC and 50 V AC/DC. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JST Sales America |
| Package | JST_SH_BM04B-SRSS-TB_1x04-1MP_P1.00mm_Vertical |
| Category | Connectors |
| Pins | 4 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Contact resistance (initial value) |  |  |  | 20 | mΩ | Initial value | 1 |
| Contact resistance (after environmental tests) |  |  |  | 40 | mΩ | After environmental tests | 1 |
| Insulation resistance |  | 100 |  |  | MΩ |  | 1 |
| Current rating |  |  |  | 0.7 | A | AC/DC | 1 |
| Voltage rating |  |  |  | 50 | V | AC/DC | 1 |
| Operating temperature range |  | -25 |  | 85 | °C | Including temperature rise while applying electrical current | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | PBT |  | Base housing: PBT (Glass-filled), UL94V-0, natural (white) | 3 |
| contacts | Phosphor bronze | tin | Contact: Phosphor bronze, tin-plated | 2 |

## CAD (KiCad official)

- Symbol: `BM04B-SRSS-TB`
- Footprint: `Connector_JST:JST_SH_BM04B-SRSS-TB_1x04-1MP_P1.00mm_Vertical`
- 3D model: JST_SH_BM04B-SRSS-TB_1x04-1MP_P1.00mm_Vertical (KiCad packages3D, STEP)

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [JST Sales America datasheet](https://www.mouser.com/datasheet/3/1070/1/eSR_SZ.pdf) (4 pp, sha256 `25c2aa750d4a0918`, retrieved 2026-11-10, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/bm04b-srss-tb-datasheet.pdf)