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STMicroelectronics TDA7387 — Analog & Data Acquisition

STMicroelectronics TDA7387 Class AB Audio Amp

MPNTDA7387
End of Life

STMicroelectronics TDA7387, Class AB, 4-Channel (Quad), 41W x 4 @ 4Ohm, Through Hole, 25-Flexiwatt (Formed Leads), -40°C ~ 105°C.

$4.88Ref. price · indicative, final on quote
STMicroelectronics TDA7387 datasheet (PDF)
Packaging25-Flexiwatt (Formed Leads)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

TDA7387 specifications
ParameterValue
TypeClass AB
Output type4-Channel (Quad)
MountingThrough Hole
Max output power x channels @ load41W x 4 @ 4Ohm
Operating temperature-40°C ~ 105°C (TA)
PackageTube
Case25-Flexiwatt (Formed Leads)

Product details

The STMicroelectronics TDA7387 is a Class AB audio power amplifier in a 25-Flexiwatt through-hole package, delivering 41 W per channel into 4-ohm loads across four channels. It's built for car-radio head units and aftermarket automotive audio systems where the board sits in a ventilated chassis but sees under-dash temperatures — the -40 to 105 °C operating range covers that environment without a fan. The formed leads on the Flexiwatt package let you bolt it to a heatsink directly; the vertical mounting variant (25-Flexiwatt Vertical) is the one you'll see on most production boards.

41 W x 4 — what that rating actually means for the BOM

The 41 W per channel into 4 ohms is the max output at a stated distortion level. That's enough to drive a set of 4-ohm door speakers.

The formed leads mean the pins are pre-bent to a vertical standoff.

Frequently asked questions

What is the pinout of TDA7387?

The TDA7387 uses the standard 25-Flexiwatt pinout common to ST's quad audio amp family. Pin 1 is the standby input, pin 2 is the mute input, pins 3–6 are the four non-inverting inputs, pins 7–10 are the four inverting inputs, and the remaining pins carry the four output channels, supply rails, and ground returns. For the exact pin map, reference the ST datasheet — the formed-lead variant has the same pin numbering as the vertical version.

What is the equivalent of TDA7387?

The TDA7563B is the closest functional equivalent in the same 25-Flexiwatt footprint, but it delivers 75 W per channel and adds I²C control, so it is not a pin-for-pin replacement unless the design already supports the I²C bus and higher output. For a direct swap without changing the board layout, stick with the TDA7387.

Does TDA7387 require an external heatsink?

Yes. The 41 W per channel output generates significant heat, and the Flexiwatt package is designed to be bolted to a heatsink. Without one, the thermal protection will engage well below rated power. Use a thermal pad or grease between the tab and the heatsink.

Can TDA7387 replace TDA7386?

The TDA7387 is a higher-power variant (41 W vs the TDA7386's typical 30–35 W range) in the same Flexiwatt footprint. The pinout is compatible, but check the supply voltage and load impedance requirements — the TDA7387 expects a 4-ohm load for its rated output. If the original design used the TDA7386 at 4 ohms, the swap is straightforward.