Skip to main content
Log in
Texas Instruments TPA3121D2PWP — Analog & Data Acquisition

TPA3121D2PWP Class D Audio Amp IC, 30W Mono / 15W Stereo

MPNTPA3121D2PWP
End of Life

Texas Instruments TPA3121D2PWP, Class D audio amplifier IC, 30W x 1 @ 8Ω mono or 15W x 2 @ 4Ω stereo, 10V–26V supply, -40°C to 85°C, 24-HTSSOP exposed-pad package, Tube.

$5.47Ref. price · indicative, final on quote
Texas Instruments TPA3121D2PWP datasheet (PDF)
Packaging24-TSSOP (0.173", 4.40mm Width) Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

TPA3121D2PWP specifications
ParameterValue
TypeClass D
Output type1-Channel (Mono) or 2-Channel (Stereo)
MountingSurface Mount
Supply voltage10V ~ 26V
Max output power x channels @ load30W x 1 @ 8Ohm; 15W x 2 @ 4Ohm
Operating temperature-40°C ~ 85°C (TA)
PackageTube
FeaturesDepop, Mute, Short-Circuit and Thermal Protection, Shutdown
Case24-TSSOP (0.173\", 4.40mm Width) Exposed Pad

Product details

Mono or stereo wiring — one chip, two topologies

For stereo operation, wire each channel to its own 4 Ω speaker — the part delivers 15 W per side. For mono, bridge the outputs into a single 8 Ω load for 30 W. The datasheet application diagrams show the BTL (bridged) connection for mono and the single-ended filter for stereo. The mute and shutdown pins are active-low; pull them to ground to disable the output, or leave them pulled up through a resistor for normal operation. The depop circuit ramps the output bias slowly on startup, so you don't get a thump into the speaker.

Active, ROHS3, sourced to order

Frequently asked questions

What is the difference between TPA3121D2PWP and TPA3121D2?

The TPA3121D2PWP is the same die in a 24-HTSSOP exposed-pad package (PowerPAD), while TPA3121D2 refers to the standard 24-TSSOP non-exposed-pad variant. The PWP suffix indicates the PowerPAD package, which improves thermal dissipation for higher continuous output power.

Is TPA3121D2PWP a direct replacement for TPA3121D2?

Yes, the TPA3121D2PWP is pin-compatible with the TPA3121D2. The PWP version adds an exposed thermal pad for better heat transfer. In a design originally laid out for the standard TSSOP, the PWP version fits the same footprint — just ensure the PCB has a copper pad under the part for the exposed pad to solder to.

Does TPA3121D2PWP require an external heatsink?

At 30 W mono into 8 Ω, the exposed pad on the 24-HTSSOP package can dissipate roughly 2-3 W into a good copper pour. For continuous full-power operation, a small clip-on heatsink or a larger board copper area is recommended. At 15 W stereo into 4 Ω, the pad alone may suffice with adequate airflow.

How do I wire TPA3121D2PWP for stereo operation?

For stereo, connect each channel's output through an LC filter (typically 10 µH + 0.47 µF) to a 4 Ω speaker. The left channel uses the OUTL+ and OUTL- pins; the right channel uses OUTR+ and OUTR-. Leave the BTL (bridge-tied load) configuration for mono only. The datasheet application schematic shows the filter component values.

How to configure TPA3121D2PWP for mono output?

For mono, bridge the two channels by connecting the speaker between OUTL+ and OUTR- (or the complementary pair), and drive both channels with the same input signal. This BTL configuration delivers 30 W into an 8 Ω load. The datasheet provides the exact pin connections.