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Texas Instruments LM4991LDX/NOPB — Memory (DRAM / SRAM / Flash / EEPROM)
Texas Instruments

LM4991LDX/NOPB Boomer® Class AB Audio Amp, 3W Mono, 8-WSON

MPNLM4991LDX/NOPB
End of Life

Texas Instruments Boomer® series, LM4991LDX/NOPB, Class AB audio power amplifier, 1-Channel (Mono), 3W x 1 @ 3Ohm max output, 2.2V ~ 5.5V supply, -40°C ~ 85°C, 8-WDFN Exposed Pad / 8-WSON (4x4) package, Surface Mount, Bulk.

$0.71Ref. price · indicative, final on quote
LM4991LDX/NOPB datasheet
Packaging8-WDFN Exposed Pad
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

LM4991LDX/NOPB Technical Specifications
ParameterValue
TypeClass AB
SeriesBoomer®
Output type1-Channel (Mono)
Mounting typeSurface Mount
Voltage2.2V ~ 5.5V
Max output power x channels @ load3W x 1 @ 3Ohm
Operating temperature-40°C ~ 85°C (TA)
PackageBulk
FeaturesDepop, Shutdown, Thermal Protection
Case8-WDFN Exposed Pad

Product details

3W into 3Ω — what that means for the BOM

The 3W rating into 3Ω is the maximum output power at 1% THD+N typical for this Class AB stage. The supply voltage directly sets the available swing: at 5V you get the full 3W; at 3.3V output drops proportionally.

Active production — no LTB risk

The LM4991LDX/NOPB carries an Active product status per the manufacturer. That means no last-time-buy window, no end-of-life notice pending. For a BOM line that needs a proven audio amp with industrial temperature range, this part is safe to qualify into new production. The NOPB suffix confirms lead-free / RoHS-compliant finish — no separate Pb-free conversion needed.

Package and mounting — 8-WSON with exposed pad

The package has an exposed pad on the bottom. That pad must be soldered to a PCB thermal land and connected to the ground plane for heat dissipation.

Frequently asked questions

Is LM4991LDX/NOPB equivalent to LM4991MTX?

The LM4991MTX is a different package variant (TSSOP) of the same amplifier core. The LDX/NOPB is in an 8-WSON package. They are electrically equivalent but not pin-compatible — the package footprint differs.

What is the pinout of LM4991LDX/NOPB?

The pinout is standard for the Boomer® mono amplifier family: pins include shutdown, bypass, input, output, and supply/ground. Refer to the datasheet for the exact pin mapping for the 8-WSON package.