component
LMR51420YDDCR
Public Made by Adomby adom
Texas Instruments DC-DC Converters, SOT-23-6. 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
markdownLMR51420YDDCR
Texas Instruments · DC-DC Converters · SOT-23-6
LMR51420YDDCR from Texas Instruments, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Power ground terminal that connects to low-side FET source and system ground; shortest path to input capacitor ground required. |
| 2 | SW | output | Switching output (-0.3 to 38 V DC, -3.0 to 38 V transient) that connects to power inductor and high-side/low-side FET switch node. |
| 3 | VIN | power_in | Supply input terminal (4.5 to 36 V operating range) to internal bias LDO and high-side FET; connect input bypass capacitors directly to this pin and GND. |
| 4 | FB | input | Feedback input (0 to 4.5 V operating, -0.3 to 5.5 V absolute maximum) for resistor divider output voltage setting that must never be shorted to ground during operation. |
| 5 | EN | input | Precision enable input (1.1 to 1.36 V rising threshold, 0.95 to 1.22 V falling threshold) that controls ON/OFF operation; high = on, low = off; cannot be left floating. |
| 6 | CB | output | Bootstrap capacitor connection (-0.3 to 43.5 V absolute maximum, -0.3 to 5.5 V to SW) requiring 100-nF ceramic capacitor connection between this pin and SW pin for high-side FET gate drive. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |
CAD (KiCad official)
- Symbol:
LMR51420YDDCR - Footprint:
Package_TO_SOT_SMD:SOT-23-6 - 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files:
lmr51420yddcr-etched.step/lmr51420yddcr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lmr51420yddcr.step/lmr51420yddcr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (33 pp, sha256
0ad3d2ef438f42ca, retrieved 2026-09-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).