component
LMBZ5257BLT1G
Public Made by Adomby adom
LRC Zener Diodes, SOT-23. 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
markdownLMBZ5257BLT1G
LRC · Zener Diodes · SOT-23
LMBZ5257BLT1G from LRC, in a SOT-23. 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 | Anode | passive | Zener diode anode; the datasheet gives forward voltage VF of 0.9 V max at IF = 10 mA on page 3 (page 2 states 0.95 V max). |
| 2 | NC | unconnected | No internal connection; the datasheet pinout lists pin 2 as No Connection. |
| 3 | Cathode | passive | Zener diode cathode, indicated on the package by the polarity band. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| Package | SOT-23 |
| Category | Diodes |
| Pins | 3 |
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 | 31.35 | 33 | 34.65 | Volts | @ IZT = 3.8 mA; pulse test at 25°C (Note 3) | 3 |
| Maximum Zener Impedance | ZZT | 58 | Ω | @ IZT = 3.8 mA | 3 | ||
| Maximum Zener Impedance | ZZK | 700 | Ω | @ IZK = 0.25 mA | 3 | ||
| Forward Voltage | VF | 0.9 | V | @ IF = 10 mA | 3 | ||
| Total Power Dissipation on FR-5 Board | PD | 225 | mW | @ TA = 25°C (Note 1, FR-5 board) | 1 | ||
| Derating above 25°C (FR-5 Board) | PD | 1.8 | mW/°C | derated above 25°C (Note 1, FR-5 board) | 1 | ||
| Thermal Resistance Junction-to-Ambient (FR-5 Board) | RJA | 556 | °C/W | Note 1, FR-5 board | 1 | ||
| Total Power Dissipation on Alumina Substrate | PD | 300 | mW | @ TA = 25°C (Note 2, alumina substrate) | 1 | ||
| Derating above 25°C (Alumina Substrate) | PD | 2.4 | mW/°C | derated above 25°C (Note 2, alumina substrate) | 1 | ||
| Thermal Resistance Junction-to-Ambient (Alumina Substrate) | RJA | 417 | °C/W | Note 2, alumina substrate | 1 | ||
| Junction and Storage Temperature Range | TJ,Tstg | -65 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
LMBZ5257BLT1G - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
lmbz5257blt1g-etched.step/lmbz5257blt1g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lmbz5257blt1g.step/lmbz5257blt1g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LRC datasheet (6 pp, sha256
6a89f966292ecd91, retrieved 2026-10-20, 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).