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lm4861mx

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Texas Instruments Audio Power OpAmps, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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docs lm4861mx: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers lm4861mx: viewers · Ray 2mo ago
lm4861mx-etched.fit.json lm4861mx: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
lm4861mx-etched.glb lm4861mx: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
lm4861mx-etched.step lm4861mx: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
lm4861mx.glb Publish 0.1.0 · Ray 2mo ago
lm4861mx.kicad_mod Publish 0.1.0 · Ray 2mo ago
lm4861mx.kicad_sym Publish 0.1.0 · Ray 2mo ago
lm4861mx.lbr Publish 0.1.0 · Ray 2mo ago
lm4861mx.step Publish 0.1.0 · Ray 2mo ago
package.json Publish 0.1.0 · Ray 2mo ago
page.json lm4861mx: specified limits as data (metadata.characteristics, 15 rows from the datasheet) · Ray 20d ago
README.md lm4861mx: specified limits as data (metadata.characteristics, 15 rows from the datasheet) · Ray 20d ago

LM4861MX

Texas Instruments · Audio Power OpAmps · SOIC-8

LM4861MX 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 SHUTDOWN input Active-high shutdown control. Drive to VDD to disable the amplifier (typical shutdown current 0.6µA); drive to GND to enable. Must not be left floating - no internal pull-down exists. An external 47kΩ pull-up can be used with a switch to GND to enable.
2 BYPASS passive Half-supply (VDD/2) internal reference bypass node. Connect an external bypass capacitor CB (typ 1.0µF) from this pin to GND to filter the half-supply reference; larger CB improves low-frequency THD+N.
3 +IN input Non-inverting input of the first (gain-configurable) amplifier. Typically tied to the BYPASS (VDD/2) node through a resistor in bridged applications so the amplifier's input is biased at half-supply.
4 -IN input Inverting input of the first amplifier. Closed-loop differential gain is set by Rf/Ri (Avd = 2·Rf/Ri); connect the audio input through a coupling capacitor Ci and series resistor Ri, with feedback resistor Rf from Vo1 to this pin.
5 Vo1 output Output of the first (gain-configurable) amplifier. One side of the bridge-tied load; biased at VDD/2. Drives the 8Ω load differentially with Vo2 (180° out of phase). Delivers up to 1.1W (1% THD+N) into 8Ω at VDD = 5V.
6 VDD power_in Positive supply voltage input, 2.0V to 5.5V operating range (6.0V absolute maximum). Typical quiescent current 6.5mA. Bypass locally with a 0.1µF ceramic capacitor as close as possible to the pin for low-noise operation and high PSRR.
7 GND power_in Ground reference return. All voltages are measured with respect to this pin.
8 Vo2 output Output of the second amplifier, internally fixed at unity gain in an inverting configuration (Av = -1) via two internal 40kΩ resistors. Forms the second half of the bridge-tied load with Vo1; biased at VDD/2 and 180° out of phase with Vo1. In single-ended use, load with a 0.1µF + 2kΩ dummy network for stability.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Op-amp/Cmp
Pins 8

Ordering variants

  • LM4861MX
  • LM4861MXLM4861M/NOPB
  • LM4861MX/NOPB

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Supply Voltage VDD 2 5.5 V 3
Quiescent Power Supply Current IDD 6.5 10 mA VIN = 0V, IO = 0A 3
Shutdown Current ISD 0.6 10 μA VSHUTDOWN = VDD 3
Output Offset Voltage VOS 5 50 mV VIN = 0V 3
Output Power PO 1 1.1 W THD = 1% (max); f = 1 kHz 3
Temperature Range TA -40 85 °C TMIN ≤ TA ≤ TMAX 3
Supply Voltage VDD 2 5.5 V 3
Supply Voltage 6 V 3
Input Voltage -0.3 V Upper limit printed as VDD + 0.3V 3
Storage Temperature -65 150 °C 3
Junction Temperature TJ 150 °C 3
Soldering Information (SOIC vapor phase) 215 °C Vapor phase, 60 sec. 3
Soldering Information (SOIC infrared) 220 °C Infrared, 15 sec. 3
Thermal Resistance Junction-to-Case θJC 35 °C/W M08A package 3
Thermal Resistance Junction-to-Ambient θJA 140 °C/W M08A package 3

CAD (KiCad official)

  • Symbol: LM4861MX
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: lm4861mx-etched.step / lm4861mx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm4861mx.step / lm4861mx.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (None pp, sha256 d212743516cb9c3a, 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).

Datasheet PDF