component
LM4128BMFX-3.3
Public Made by Adomby adom
Texas Instruments Voltage Reference, SOT-23-5. 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
markdownLM4128BMFX-3.3
Texas Instruments · Voltage Reference · SOT-23-5
LM4128BMFX-3.3 from Texas Instruments, in a SOT-23-5. 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 | N/C | unconnected | No connect pin, leave floating. |
| 2 | GND | power_in | Ground reference. |
| 3 | EN | input | Enable pin for shutdown mode control with input logic thresholds: 35% VIN (low) and 65% VIN (high), drawing 3-7 µA supply current when low. |
| 4 | VIN | power_in | Input supply voltage with operating range from VREF + 400 mV to 5.5V. |
| 5 | VREF | power_in | Reference output voltage (3.3V nominal) providing up to 20 mA output current with dropout voltage of 200-400 mV at 10 mA load. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |
CAD (KiCad official)
- Symbol:
LM4128BMFX-3.3 - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files:
lm4128bmfx-3-3-etched.step/lm4128bmfx-3-3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm4128bmfx-3-3.step/lm4128bmfx-3-3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (35 pp, sha256
e27d30b33d01ce1e, retrieved 2026-10-06, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(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).