Diodes Incorporated PAM8124RHR

Overview

PAM8124RHR from Diodes Incorporated is a 15W stereo Class-D audio power amplifier in TSSOP-24-EP package, supporting both single-ended (4Ω) and bridge-tied-load (8Ω BTL) output configurations with four fixed-gain settings (20/26/32/36dB), internal oscillator, and thermal/short-circuit protection with auto-recovery - used in TV audio stages and active speaker amplification.

For engineers reviewing the PAM8124RHR datasheet, PAM8124RHR pinout, PAM8124RHR application, or PAM8124RHR equivalent, key selection criteria include supply voltage range (10–26V), gain select logic compatibility with AVCC, bootstrap capacitor requirements (220nF per channel), VCLAMP decoupling (1µF), and SE/BTL configuration control via SE_BTL pin logic level.

Technical Context

The PAM8124RHR integrates dual half-bridge Class-D output stages with independent left/right H-bridge power supplies (PVCCL/PVCCR), internal 250–360kHz oscillator, and analog input biasing via VCM reference. It uses NMOS-only output transistors requiring external bootstrap capacitors (BSL/BSR) and internal gate-clamp regulation (VCLAMP).

Gain is set by TTL-compatible GAIN0/GAIN1 pins controlling on-chip resistor ratios, yielding ±20% input impedance variation (6.67kΩ to 40kΩ) across gain steps. MUTE and SDN pins provide independent output disable and ultra-low-quiescent shutdown (≤60µA), with thermal trip at 160°C and 60°C hysteresis.

Key Specifications

Pinout & Package

Package: TSSOP-24-EP (exposed thermal pad), 0.65mm pitch, RoHS-compliant Pb-free lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo Class-D audio amplifier applications.

Compared with TPA3110D2PWP and MAX9718ETA+, the PAM8124RHR uniquely combines 26V operation, four selectable gains, integrated oscillator and VCLAMP, and auto-recovering protection - making it optimal for cost-sensitive, space-constrained 10–24V consumer audio systems requiring design flexibility and robustness.

Availability

PAM8124RHR is available at Aetrix Electronics and suitable for smart TV audio subsystems, powered speaker production, and soundbar manufacturing requiring stable component supply, long-lifecycle support, and consistent parametric performance across batches.

Supply support for PAM8124RHR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.

The PAM8124RHR belongs to Diodes' PAM family of Class-D audio amplifiers, designed specifically for high-efficiency, low-EMI, heatsink-free audio power delivery in cost-sensitive consumer electronics.

FAQ

What is the minimum recommended input coupling capacitor value for PAM8124RHR at 20Hz bass extension with 40kΩ input impedance?

Using the formula f_c = 1/(2π × R_i × C_i), a 40kΩ input impedance requires C_i = 1/(2π × 40kΩ × 20Hz) ≈ 200nF. The datasheet recommends 220nF ceramic or low-leakage tantalum to ensure flat bass response down to 20Hz while minimizing DC offset and leakage-induced headroom loss.

How does the SE_BTL pin affect both output configuration and oscillator frequency?

A logic low on SE_BTL configures the device for mono bridge-tied-load (BTL) operation and sets oscillator frequency to 360kHz; a logic high enables stereo single-ended (SE) mode and reduces oscillator frequency to 250kHz. This dual function allows optimized EMI filtering (higher f_osc → smaller LC components) and topology selection using one pin.

Can PAM8124RHR operate safely without an external heatsink at full 15W output?

Yes - due to ≥95% efficiency and 40°C/W junction-to-ambient thermal resistance in TSSOP-24-EP, the device remains within 125°C junction limit at 15W into 4Ω with standard 2-layer PCB (35µm copper, thermal pad soldered, ≥9 vias). No external heatsink is required if PCB thermal design follows datasheet layout guidelines.

What failure modes trigger auto-recovery versus latched shutdown in PAM8124RHR?

Short-circuit and thermal faults trigger auto-recovery: outputs disable immediately but resume normal operation once fault condition clears (e.g., short removed or die cools by 60°C). OVP and UVLO are also auto-recovering. Only persistent SDN low or catastrophic latch-up causes non-recovering failure - no internal latched fault states exist in normal operation.