component
1SMA5940BT3G
Public Made by Adomby adom
onsemi Zener Diodes, SMA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1SMA5940BT3G
onsemi · Zener Diodes · SMA
1SMA5940BT3G 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, identified by the polarity band or molded polarity notch on the SMA package (CASE 403D, STYLE 1, pin 1). |
| 2 | ANODE | passive | Anode terminal of the Zener diode (CASE 403D, STYLE 1, pin 2), opposite the cathode 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 (VZ), 43 V nominal, ±5% part | VZ | 40.85 | 43 | 45.15 | V | @ IZT = 8.7 mA, TA = 25°C (Note 4: guaranteed at thermal equilibrium) | 2 |
| Zener voltage tolerance | -5 | 5 | % | Type number tolerance designation (Note 3) | 2 | ||
| Maximum Zener impedance | ZZT | 53 | Ω | @ IZT = 8.7 mA | 2 | ||
| Maximum Zener impedance | ZZK | 950 | Ω | @ IZK = 0.25 mA | 2 | ||
| Reverse leakage current | IR | 0.5 | µA | @ VR = 32.7 V | 2 | ||
| Maximum DC Zener current | IZM | 35 | mA(dc) | 2 | |||
| Forward voltage | VF | 1.2 | V | @ IF = 200 mA | 2 | ||
| DC power dissipation (lead-referenced) | PD | 1.5 | W | TL = 75°C, measured zero lead length (Note 1); derate 20 mW/°C above 75°C | 1 | ||
| DC power dissipation (ambient) | PD | 0.5 | W | TA = 25°C (Note 2); derate 4.0 mW/°C above 25°C | 1 | ||
| Operating and storage temperature range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal resistance, junction-to-lead | RJL | 50 | °C/W | Junction-to-lead, 1 in² copper pad, FR-4 (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:
1SMA5940BT3G - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
1sma5940bt3g-etched.step/1sma5940bt3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma5940bt3g.step/1sma5940bt3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (5 pp, sha256
718bfbda0fd2b50b, 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).
# 1SMA5940BT3G
**onsemi** · Zener Diodes · SMA
1SMA5940BT3G 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, identified by the polarity band or molded polarity notch on the SMA package (CASE 403D, STYLE 1, pin 1). |
| 2 | ANODE | passive | Anode terminal of the Zener diode (CASE 403D, STYLE 1, pin 2), opposite the cathode 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 (VZ), 43 V nominal, ±5% part | VZ | 40.85 | 43 | 45.15 | V | @ IZT = 8.7 mA, TA = 25°C (Note 4: guaranteed at thermal equilibrium) | 2 |
| Zener voltage tolerance | | -5 | | 5 | % | Type number tolerance designation (Note 3) | 2 |
| Maximum Zener impedance | ZZT | | | 53 | Ω | @ IZT = 8.7 mA | 2 |
| Maximum Zener impedance | ZZK | | | 950 | Ω | @ IZK = 0.25 mA | 2 |
| Reverse leakage current | IR | | | 0.5 | µA | @ VR = 32.7 V | 2 |
| Maximum DC Zener current | IZM | | | 35 | mA(dc) | | 2 |
| Forward voltage | VF | | | 1.2 | V | @ IF = 200 mA | 2 |
| DC power dissipation (lead-referenced) | PD | | | 1.5 | W | TL = 75°C, measured zero lead length (Note 1); derate 20 mW/°C above 75°C | 1 |
| DC power dissipation (ambient) | PD | | | 0.5 | W | TA = 25°C (Note 2); derate 4.0 mW/°C above 25°C | 1 |
| Operating and storage temperature range | TJ, Tstg | -65 | | 150 | °C | | 1 |
| Thermal resistance, junction-to-lead | RJL | | | 50 | °C/W | Junction-to-lead, 1 in² copper pad, FR-4 (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: `1SMA5940BT3G`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `1sma5940bt3g-etched.step` / `1sma5940bt3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma5940bt3g.step` / `1sma5940bt3g.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/1sma5940bt3-d.pdf) (5 pp, sha256 `718bfbda0fd2b50b`, 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/1sma5940bt3g-datasheet.pdf)