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LMSZ5251BT1G
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LRC Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LMSZ5251BT1G
LRC · Zener Diodes · SOD-123
LMSZ5251BT1G from LRC, in a SOD-123. 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 is marked by the polarity band and is pin 1; for this device the reverse Zener voltage is 22 V nominal (20.90 V min to 23.10 V max at IZT = 5.6 mA). |
| 2 | Anode | passive | Anode is pin 2, and the datasheet gives a forward voltage of 0.9 V max at IF = 10 mA, with a junction and storage temperature range of −55 °C to +150 °C. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| Package | SOD-123 |
| 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 (nominal 22 V) @ IZT | VZ | 20.9 | 22 | 23.1 | V | @ IZT = 5.6 mA | 3 |
| Zener voltage tolerance | VZ | -5 | 5 | % | Standard tolerance on nominal Zener voltage (Note 3) | 3 | |
| Maximum Zener Impedance @ IZT | ZZT | 29 | Ω | @ IZT = 5.6 mA | 3 | ||
| Maximum Zener Impedance @ IZK | ZZK | 600 | Ω | @ IZK = 0.25 mA | 3 | ||
| Reverse Leakage Current | IR | 0.1 | µA | @ VR = 17 V | 3 | ||
| Forward Voltage | VF | 0.9 | V | @ IF = 10 mA | 3 | ||
| Total Power Dissipation on FR-5 Board | PD | 500 | mW | @ TL = 75°C (Note 1, FR-5 = 3.5 X 1.5 inches) | 1 | ||
| Derating of Total Power Dissipation | PD | 6.7 | mW/°C | Derated above 75°C | 1 | ||
| Thermal Resistance, Junction-to-Ambient | RJA | 340 | °C/W | (Note 2) infrared scan method | 1 | ||
| Thermal Resistance, Junction-to-Lead | RJL | 150 | °C/W | (Note 2) infrared scan method | 1 | ||
| Junction and Storage Temperature Range | TJ, Tstg | -55 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
LMSZ5251BT1G - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files:
lmsz5251bt1g-etched.step/lmsz5251bt1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lmsz5251bt1g.step/lmsz5251bt1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LRC datasheet (6 pp, sha256
9dcd48ce1826b714, retrieved 2026-10-19, tier: lcsc) - 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).
# LMSZ5251BT1G
**LRC** · Zener Diodes · SOD-123
LMSZ5251BT1G from LRC, in a SOD-123. 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 is marked by the polarity band and is pin 1; for this device the reverse Zener voltage is 22 V nominal (20.90 V min to 23.10 V max at IZT = 5.6 mA). |
| 2 | Anode | passive | Anode is pin 2, and the datasheet gives a forward voltage of 0.9 V max at IF = 10 mA, with a junction and storage temperature range of −55 °C to +150 °C. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| Package | SOD-123 |
| 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 (nominal 22 V) @ IZT | VZ | 20.9 | 22 | 23.1 | V | @ IZT = 5.6 mA | 3 |
| Zener voltage tolerance | VZ | -5 | | 5 | % | Standard tolerance on nominal Zener voltage (Note 3) | 3 |
| Maximum Zener Impedance @ IZT | ZZT | | | 29 | Ω | @ IZT = 5.6 mA | 3 |
| Maximum Zener Impedance @ IZK | ZZK | | | 600 | Ω | @ IZK = 0.25 mA | 3 |
| Reverse Leakage Current | IR | | | 0.1 | µA | @ VR = 17 V | 3 |
| Forward Voltage | VF | | | 0.9 | V | @ IF = 10 mA | 3 |
| Total Power Dissipation on FR-5 Board | PD | | | 500 | mW | @ TL = 75°C (Note 1, FR-5 = 3.5 X 1.5 inches) | 1 |
| Derating of Total Power Dissipation | PD | | | 6.7 | mW/°C | Derated above 75°C | 1 |
| Thermal Resistance, Junction-to-Ambient | RJA | | | 340 | °C/W | (Note 2) infrared scan method | 1 |
| Thermal Resistance, Junction-to-Lead | RJL | | | 150 | °C/W | (Note 2) infrared scan method | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -55 | | 150 | °C | | 1 |
## CAD (KiCad official)
- Symbol: `LMSZ5251BT1G`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `lmsz5251bt1g-etched.step` / `lmsz5251bt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lmsz5251bt1g.step` / `lmsz5251bt1g.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [LRC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586185780100812800) (6 pp, sha256 `9dcd48ce1826b714`, retrieved 2026-10-19, tier: lcsc)
- **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/lmsz5251bt1g-datasheet.pdf)