component
1SMA5942BT3G-MS
Public Made by Adomby adom
MSKSEMI Zener Diodes, SMA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdown1SMA5942BT3G-MS
MSKSEMI · Zener Diodes · SMA
1SMA5942BT3G-MS from MSKSEMI, 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 | K | passive | Cathode, indicated by the molded polarity notch or cathode band; Zener voltage 51 V nominal (48.45 V to 53.55 V) at IZT = 7.3 mA for the 1SMA5942B type, reverse-biased in regulation. |
| 2 | A | passive | Anode of the Zener diode; forward voltage VF is 1.2 V max at IF = 200 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| 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 | 48.45 | 51 | 53.55 | V | @ IZT = 7.3 mA, TA = 25°C | 3 |
| Zener Test Current | IZT | 7.3 | mA | Test current for VZ and ZZT | 3 | ||
| Maximum Zener Impedance | ZZT | 70 | Ω | @ IZT = 7.3 mA | 3 | ||
| Maximum Zener Impedance | ZZK | 1100 | Ω | @ IZK = 0.25 mA | 3 | ||
| Reverse Current (knee) | IZK | 0.25 | mA | Test current for ZZK | 3 | ||
| Reverse Leakage Current | IR | 0.5 | μA | @ VR = 38.8 V | 3 | ||
| Reverse Voltage | VR | 38.8 | V | Test voltage for IR | 3 | ||
| Maximum DC Zener Current | IZM | 29 | mA | 3 | |||
| Forward Voltage | VF | 1.2 | V | @ IF = 200 mA, all types | 3 | ||
| DC Power Dissipation (lead) | PD | 1.5 | W | @ TL = 75°C, zero lead length, 1 in square copper pad FR-4 | 2 | ||
| Derating above 75°C | 20 | mW/°C | Above TL = 75°C | 2 | |||
| DC Power Dissipation (ambient) | PD | 0.5 | W | @ TA = 25°C, FR-4 board, minimum recommended footprint | 2 | ||
| Derating above 25°C | 4 | mW/°C | Above TA = 25°C | 2 | |||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 2 | ||
| Thermal Resistance, Junction-to-Lead | RθJL | 50 | °C/W | 1 in square copper pad, FR-4 board | 2 | ||
| Thermal Resistance, Junction-to-Ambient | RθJA | 250 | °C/W | FR-4 board, minimum recommended footprint | 2 | ||
| Zener Voltage Tolerance | -5 | 5 | % | Type number indicates tolerance of ±5% | 3 |
CAD (KiCad official)
- Symbol:
1SMA5942BT3G-MS - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
1sma5942bt3g-ms-etched.step/1sma5942bt3g-ms-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma5942bt3g-ms.step/1sma5942bt3g-ms.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MSKSEMI datasheet (7 pp, sha256
84b58db054664c6f, retrieved 2026-10-27, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).