component
1SMA5921BT3G
Public Made by Adomby adom
onsemi Zener Diodes, SMA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
1SMA5921BT3G
onsemi · Zener Diodes · SMA
1SMA5921BT3G 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 of the Zener regulator, identified by the molded polarity notch or cathode band; the datasheet specifies the cathode as pin 1 (Style 1). |
| 2 | ANODE | passive | Anode terminal of the Zener regulator; the datasheet specifies a maximum forward voltage of VF = 1.5 V at IF = 200 mA for all types. |
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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage | VZ | 6.46 | 6.8 | 7.14 | V | @ IZT = 55.1 mA (TA = 25°C) | 2 |
| Zener voltage tolerance (type number 5% designation) | -5 | 5 | % | Type number 1SMA5921BT3G indicates 5% tolerance (Note 3) | 2 | ||
| Maximum Zener Impedance | ZZT | 2.5 | Ω | @ IZT = 55.1 mA | 2 | ||
| Maximum Zener Impedance | ZZK | 200 | Ω | @ IZK = 1.0 mA | 2 | ||
| Reverse Leakage Current | IR | 2.5 | µA | @ VR = 5.2 V | 2 | ||
| Forward Voltage | VF | 1.5 | V | @ IF = 200 mA | 2 | ||
| Maximum DC Zener Current | IZM | 221 | mA | 2 | |||
| DC Power Dissipation | PD | 1.5 | W | @ TL = 75°C, measured zero lead length (Note 1) | 1 | ||
| DC Power Dissipation | PD | 0.5 | W | @ TA = 25°C (Note 2) | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal Resistance, Junction-to-Lead | RθJL | 50 | °C/W | Note 1 (1 in² copper pad, FR-4) | 1 | ||
| Thermal Resistance, Junction-to-Ambient | RθJA | 250 | °C/W | Note 2 (FR-4, ON Semiconductor minimum recommended footprint) | 1 |
CAD (KiCad official)
- Symbol:
1SMA5921BT3G - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
1sma5921bt3g-etched.step/1sma5921bt3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma5921bt3g.step/1sma5921bt3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (5 pp, sha256
1ca169f64a35c9ee, retrieved 2026-10-21, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).
# 1SMA5921BT3G
**onsemi** · Zener Diodes · SMA
1SMA5921BT3G 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 of the Zener regulator, identified by the molded polarity notch or cathode band; the datasheet specifies the cathode as pin 1 (Style 1). |
| 2 | ANODE | passive | Anode terminal of the Zener regulator; the datasheet specifies a maximum forward voltage of VF = 1.5 V at IF = 200 mA for all types. |
## 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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage | VZ | 6.46 | 6.8 | 7.14 | V | @ IZT = 55.1 mA (TA = 25°C) | 2 |
| Zener voltage tolerance (type number 5% designation) | | -5 | | 5 | % | Type number 1SMA5921BT3G indicates 5% tolerance (Note 3) | 2 |
| Maximum Zener Impedance | ZZT | | | 2.5 | Ω | @ IZT = 55.1 mA | 2 |
| Maximum Zener Impedance | ZZK | | | 200 | Ω | @ IZK = 1.0 mA | 2 |
| Reverse Leakage Current | IR | | | 2.5 | µA | @ VR = 5.2 V | 2 |
| Forward Voltage | VF | | | 1.5 | V | @ IF = 200 mA | 2 |
| Maximum DC Zener Current | IZM | | | 221 | mA | | 2 |
| DC Power Dissipation | PD | | | 1.5 | W | @ TL = 75°C, measured zero lead length (Note 1) | 1 |
| DC Power Dissipation | PD | | | 0.5 | W | @ TA = 25°C (Note 2) | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 1 |
| Thermal Resistance, Junction-to-Lead | RθJL | | 50 | | °C/W | Note 1 (1 in² copper pad, FR-4) | 1 |
| Thermal Resistance, Junction-to-Ambient | RθJA | | 250 | | °C/W | Note 2 (FR-4, ON Semiconductor minimum recommended footprint) | 1 |
## CAD (KiCad official)
- Symbol: `1SMA5921BT3G`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `1sma5921bt3g-etched.step` / `1sma5921bt3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma5921bt3g.step` / `1sma5921bt3g.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/1sma5921bt3-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/1sma5921bt3g-datasheet.pdf)