component
lm4875mx
Public Unreviewedby Ray
Texas Instruments Audio Power OpAmps, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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README
markdownLM4875MX
Texas Instruments · Audio Power OpAmps · SOIC-8
LM4875MX 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 | VO1 | output | Amp1 (non-inverting bridge half) audio output. Drives one side of the bridged 8 Ω speaker and, in headphone mode, drives the single-ended headphone load referenced to GND. Biased at VDD/2 in bridge mode. |
| 2 | BYPASS | passive | Half-supply (VDD/2) bias-node bypass pin. A capacitor CB (typically 1.0 µF) from this pin to GND filters the internal bias reference and sets the click/pop turn-on time (~280 ms with 1.0 µF). Larger CB improves PSRR. |
| 3 | HP-Sense | input | Headphone-sense control input. VIL ≤ 0.8 V places the amplifier in bridged speaker mode; VIH ≥ 4 V (up to VCC) mutes Amp2, disconnects the bridge load, and enables single-ended headphone drive from VO1. Typically driven by a headphone-jack switch contact through a resistor divider. |
| 4 | DC Vol/SD | input | DC voltage volume control and shutdown pin. Input range GND to VDD sets gain from about −72 dB (VPIN4 ≤ 0.9 V, 20% VDD) up to +20 dB (VPIN4 ≥ 4.0 V, 80% VDD). Applying <300 mV activates the 0.7 µA micropower shutdown; 500 mV-1 V asserts mute (~75 dB attenuation). |
| 5 | -IN | input | Inverting audio input to Amp1. Drive through an input coupling capacitor Ci (blocks DC and forms a highpass with the internal 10 kΩ-110 kΩ input resistor RIN, which varies with the DC Vol/SD setting). Amp1's closed-loop gain is set by the DC Vol/SD voltage. |
| 6 | GND | power_in | Device ground / analog reference. All voltages in the datasheet are measured with respect to this pin. |
| 7 | VDD | power_in | Positive supply rail. Operating range 2.7 V to 5.5 V (absolute max 6.0 V). Quiescent current 4 mA typ (bridge mode) / 3.5 mA typ (headphone mode). Bypass close to the pin with 10 µF and 0.1 µF capacitors to GND for low noise and high PSRR. |
| 8 | VO2 | output | Amp2 (inverting bridge half) audio output. Drives the second side of the bridge-mode 8 Ω speaker with a signal 180° out of phase with VO1 (fixed −1 gain vs Amp1). Muted (Amp2 off) when HP-Sense is driven high. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Op-amp/Cmp |
| Pins | 8 |
Ordering variants
LM4875MXLM4875M/NOPBLM4875MX/NOPBLM4875MXLM4875MM/NOPB
CAD (KiCad official)
- Symbol:
LM4875MX - 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
25dfcc49bd825558, retrieved 2026-08-17, tier: manufacturer) - 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).
Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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