# 1SMA5927BT3G

**onsemi** · Zener Diodes · SMA

1SMA5927BT3G from onsemi, in a SMA. 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 | CATHODE | passive | Cathode terminal, marked by the molded polarity notch or cathode band on the SMA package (STYLE 1: Pin 1 is CATHODE, polarity band). |
| 2 | ANODE | passive | Anode terminal of the two-terminal Zener voltage regulator, opposite the cathode polarity band. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SMA |
| Category | Diodes |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage (nominal 12 V type) | VZ | 11.4 | 12 | 12.6 | V | @ IZT = 31.2 mA; VZ limits guaranteed at thermal equilibrium (Note 4) | 2 |
| Zener voltage tolerance |  | -5 |  | 5 | % | Type number indicates 5% tolerance (Note 3) | 2 |
| Maximum Zener impedance | ZZT |  |  | 6.5 | Ω | @ IZT = 31.2 mA | 2 |
| Maximum Zener impedance | ZZK |  |  | 550 | Ω | @ IZK = 0.25 mA | 2 |
| Maximum DC Zener current | IZM |  |  | 125 | mA(dc) |  | 2 |
| Forward voltage | VF |  |  | 1.5 | V | @ IF = 200 mA, for all types | 2 |
| DC power dissipation @ TL | PD |  |  | 1.5 | W | TL = 75C, measured zero lead length (Note 1) | 1 |
| DC power dissipation @ TA | PD |  |  | 0.5 | W | TA = 25C (Note 2) | 1 |
| Operating and storage temperature range | TJ, Tstg | -65 |  | 150 | C |  | 1 |
| Derating above 75C (lead) | PD |  | 20 |  | mW/C | Derate above TL = 75C | 1 |
| Derating above 25C (ambient) | PD |  | 4 |  | mW/C | Derate above TA = 25C | 1 |
| Thermal resistance, junction-to-lead | RJL |  | 50 |  | C/W | Junction-to-lead, 1 in² copper pad (Note 1) | 1 |
| Thermal resistance, junction-to-ambient | RJA |  | 250 |  | C/W | Junction-to-ambient, FR-4 minimum recommended footprint (Note 2) | 1 |

## CAD (KiCad official)

- Symbol: `1SMA5927BT3G`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `1sma5927bt3g-etched.step` / `1sma5927bt3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma5927bt3g.step` / `1sma5927bt3g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/1sma5927bt3-d.pdf) (5 pp, sha256 `1ca169f64a35c9ee`, retrieved 2026-10-21, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/1sma5927bt3g-datasheet.pdf)