The LM4861MX/NOPB: The 1.5W into 8Ω rating is the headline figure — it tells you the amplifier can drive a small speaker to reasonable volume without clipping. At lower supply voltages (say 3V) the output power drops, but the part still delivers useful audio for voice prompts or alert tones. The 2V minimum supply means it can run from a nearly depleted battery, extending runtime in portable gear. Shutdown and thermal protection are built in: the shutdown pin lets a microcontroller put the amp into a low-power idle, and the thermal protection prevents die damage if the speaker is shorted or the ambient temperature spikes. The 8-SOIC package is a standard footprint; no board respin needed if you're replacing an older 8-pin audio amp.
LM4861MX-NOPB
LM4861MX/NOPB TI Boomer Class AB Audio Amp, 1.5W Mono 8-SOIC
MPNLM4861MX/NOPB
End of Life
Texas Instruments Boomer® series, Class AB audio amplifier, mono 1.5W output into 8Ω, 2V to 5.5V supply, 8-SOIC package, -40°C to 85°C operating temperature.
$2.61Ref. price · indicative, final on quote
Packaging8-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
SeriesBoomer®
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Type | Class AB |
| Series | Boomer® |
| Output type | 1-Channel (Mono) |
| Mounting | Surface Mount |
| Supply voltage | 2V ~ 5.5V |
| Max output power x channels @ load | 1.5W x 1 @ 8Ohm |
| Operating temperature | -40°C ~ 85°C (TA) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Features | Shutdown, Thermal Protection |
| Case | 8-SOIC (0.154\", 3.90mm Width) |
Product details
Frequently asked questions
Is LM4861MX/NOPB RoHS compliant?
Yes, the LM4861MX/NOPB is ROHS3 compliant per the manufacturer's listing.
What are the alternatives to LM4861MX/NOPB?
Pin-compatible alternatives in the Boomer family include the LM4860 and LM4862, which share the same 8-SOIC footprint and supply range but differ in output power or shutdown logic. Verify the specific output power and control pin function against your design before substituting.
What is the pin configuration of LM4861MX/NOPB?
The LM4861MX/NOPB uses an 8-pin SOIC package. The pinout follows the standard Boomer mono amplifier layout: inputs, output, shutdown, bypass, and supply/ground pins. Refer to the Texas Instruments datasheet for the exact pin map.