component
LP2951ACM-3.3
Public Unreviewedby Ray
Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOIC-8. Datasheet-verified pinout, 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
markdownLP2951ACM-3.3
Texas Instruments · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOIC-8
LP2951ACM-3.3 from Texas Instruments, in a SOIC-8. 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 | OUT | power_out | Regulated output voltage (3.3 V nominal, ±0.5% typ). Sourced through internal PMOS pass element; rated to 100 mA. Requires an output capacitor (≥ 2.2 µF for 3.3-V version) with ESR of 10 mΩ-6 Ω for stability. |
| 2 | SENSE | input | Output voltage sense (Kelvin-sense) input for the internal error amplifier. Normally tied to OUT (pin 1) at the load to compensate for IR drop in the output trace. Do not leave floating. |
| 3 | SHUTDOWN | input | Logic-level shutdown control. Regulator ON when driven low (≤ 0.6 V ensured over -40 °C to 125 °C); regulator OFF when driven high (≥ 2 V). Input threshold typ 1.3 V; may be tied to IN or driven from CMOS/TTL logic. |
| 4 | GND | power_in | Device ground reference and return for internal circuitry. On the WSON (NGT) variant the exposed DAP must also be connected to this pin/GND. |
| 5 | ERROR | output | Open-collector active-low error flag. Pulls low when the output falls ~5% below nominal (dropout / undervoltage warning); useful as a power-on-reset. Off-state leakage ≤ 1 µA at 30 V; VOL ≤ 250 mV at IOL = 400 µA. Requires an external pull-up resistor. |
| 6 | VTAP | output | Output of the internal resistor divider tap (nominally 1.235 V reference for the 3.3-V fixed configuration). Tie to FEEDBACK (pin 7) to select the factory-preset 3.3-V output; leave open (or tie to an external divider node) when programming a custom output voltage. |
| 7 | FEEDBACK | input | Error-amplifier feedback input; internally regulated to VREF ≈ 1.235 V. Tie to VTAP (pin 6) for the fixed 3.3-V output, or connect to an external R1/R2 divider from OUT to program 1.24 V ≤ VOUT ≤ 29 V. Input bias current ~20 nA (typ). |
| 8 | IN | power_in | Input supply voltage, 2.3 V to 30 V. Requires a bypass capacitor (≥ 1 µF) close to the pin. Dropout is typically 40 mV at 100 µA and 380 mV at 100 mA of load. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
LP2951ACM-3.3/NOPBLP2951ACMX-3.3/NOPBLP2951ACMM-3.3/NOPBLP2951ACMMX-3.3/NOPBLP2951ACSDX-3.3/NOPBLP2951ACN/NOPB
CAD (KiCad official)
- Symbol:
LP2951ACM-3.3 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (None pp, sha256
b9e1f8851a20b9c9, retrieved 2026-08-17, tier: lcsc) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).