# MSR12A1R009F2

**prosemi** · Current Sense Resistors / Shunt Resistors · 1206

MSR12A1R009F2 from prosemi, in a 1206. 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 | First end terminal of the 2-terminal (type A) 1206 metal alloy short terminal resistor, rated 1.0W at 70℃ with operating range -55℃ to +150℃. |
| 2 | 2 | passive | Second end terminal of the 2-terminal (type A) 1206 metal alloy short terminal resistor, rated current (P/R)^1/2 with ±1% tolerance for the F code. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | prosemi |
| Package | 1206 |
| Category | Resistors |
| Pins | 2 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Resistance tolerance (code F = ±1%) |  | -1 |  | 1 | % |  | 1 |
| Temperature coefficient of resistance (TCR) | TCR | -50 |  | 50 | ppm/℃ | Resistance range 5~20 mΩ | 1 |
| Rated power | P |  |  | 1 | W | At 70℃ ambient; derate above 70℃ per curve | 1 |
| Operation temperature range |  | -55 |  | 150 | ℃ |  | 1 |
| Resistance change, resistance to soldering heat | △R |  |  | 0.5 | % | 260℃±5℃, 12 s ±0.5 s (MIL-STD-202 Method 210) | 5 |
| Resistance change, short time overload | △R |  |  | 1 | % | 1206, 1.5≤R≤10 mΩ: 4 times rated power, 5 s | 5 |
| Resistance change, temperature cycling | △R |  |  | 1 | % | -55℃ (15 min)/+150℃ (15 min), 300 cycles (MIL-STD-202 Method 107G) | 5 |
| Resistance change, low temperature storage | △R |  |  | 1 | % | -55℃, 1000 hours, no power (IEC60115-1 4.23.4) | 5 |
| Resistance change, high temperature storage | △R |  |  | 1 | % | 150℃, 1000 hours, no power (IEC60115-1 4.25) | 5 |
| Resistance change, bias humidity | △R |  |  | 1 | % | +85℃, 85% RH, 10% bias, 1000 hours; 1.5~10 mΩ (MIL-STD-202 Method 103) | 5 |
| Resistance change, vibration | △R |  |  | 0.5 | % | 5g, 20 min, 12 cycles each of 3 orientations, 10 Hz-2000 Hz (MIL-STD-202 Method 204) | 5 |
| Resistance change, operational life | △R |  |  | 1 | % | 1206, 1.5~9 mΩ: 70℃±2℃, 1000 hours, rated power 1.5 h ON / 0.5 h OFF (MIL-STD-202 Method 108) | 5 |
| Resistance change, moisture resistance | △R |  |  | 0.5 | % | MIL-STD-202 Method 106, no power, 7b not required | 5 |

## CAD (KiCad official)

- Symbol: `MSR12A1R009F2`
- Footprint: `Resistor_SMD:R_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `msr12a1r009f2-etched.step` / `msr12a1r009f2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `msr12a1r009f2.step` / `msr12a1r009f2.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [prosemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590918849678430208) (7 pp, sha256 `216066e52aa868f6`, retrieved 2026-11-07, 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/msr12a1r009f2-datasheet.pdf)