Diodes Incorporated PAM8007NHR

Overview

PAM8007NHR from Diodes Incorporated is a filterless 3W Class-D stereo audio amplifier with integrated headphone driver and 64-step DC volume control. It delivers 3.1W into 4Ω at 5V, achieves 92% efficiency, supports dual output modes (speaker/earphone), and operates across 2.5–5.5V supply range-enabling compact portable audio systems without external LC filters.

For engineers reviewing the PAM8007NHR datasheet, PAM8007NHR pinout, PAM8007NHR application, or PAM8007NHR equivalent, this device requires attention to its dual-stage gain control architecture, SSOP-24 thermal layout constraints, mute/shutdown timing sequencing, and line/earphone mode switching logic in system-level integration.

Technical Context

The PAM8007NHR integrates two independent Class-D PWM amplifiers (left/right) with separate power grounds (PGNDL/PGNDR), each driving a full-bridge output stage operating at 200–300kHz. Its filterless architecture relies on speaker inductance to suppress high-frequency content, eliminating external low-pass filters while maintaining THD+N ≤0.15% at 3W into 4Ω.

A dedicated earphone amplifier stage provides 69mW into 32Ω with SNR ≥97dB and THD+N ≤0.04%, controlled via shared VOLUME and LINE/EAR pins. The 64-step DC volume control adjusts both Class-D and earphone gains simultaneously using analog reference voltage (VDC) and internal DAC mapping per Table 1.

Key Specifications

Pinout & Package

The PAM8007NHR is housed in a 24-pin SSOP package (5.6mm × 7.8mm, 0.635mm pitch) with exposed thermal pad for PCB heat dissipation. Pin assignments are validated per DS36430 Rev. 2–3, with dedicated PGNDL/PGNDR pairs and isolated analog/digital ground paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PAM8007NHR, PAM8019E offers measurable improvements in PSRR and distortion while maintaining pin compatibility, whereas TPA2013D1 trades headphone integration and analog volume control for programmability and supply flexibility-making each suitable for distinct subsystem architectures.

Availability

PAM8007NHR is available at Aetrix Electronics and suitable for portable speakers, VoIP speakerphones, and notebook computers requiring stable component supply with known end-of-life planning.

Supply support for PAM8007NHR 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 PAM8007 belongs to Diodes' Class-D audio amplifier product line, engineered for cost-sensitive portable audio systems where filterless operation, low quiescent current, and dual-output capability are critical design requirements.

FAQ

What is the maximum recommended PCB trace length between PAM8007NHR and speaker terminals?

For filterless operation, speaker traces should be ≤20cm and routed as tightly coupled differential pairs. Longer traces increase EMI radiation and risk instability due to parasitic inductance interacting with Class-D switching edges. Ferrite beads (e.g., MH2012HM221-T) are mandatory beyond 15cm per the datasheet's EMI mitigation guidelines.

Can PAM8007NHR drive 8Ω speakers at full rated power?

No. At 8Ω load, maximum continuous output is 1.75W (10% THD+N), not 3W. The 3W rating applies only to 4Ω loads. Driving 8Ω at 3W would exceed safe operating area limits, triggering thermal shutdown or degrading long-term reliability due to increased junction temperature.

How does the LINE/EAR pin affect headphone output impedance matching?

When LINE/EAR = high, the earphone amplifier stage activates and presents 32Ω output impedance optimized for standard headphones. The internal feedback network automatically configures gain and bandwidth-no external resistors are needed. Incorrect LINE/EAR state causes no output or clipping due to mismatched load termination.

Is PAM8007NHR qualified for automotive use per AEC-Q100?

No. The PAM8007NHR is not AEC-Q100 qualified. Diodes explicitly states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing-none of which apply to this SSOP-24 commercial-grade part. For automotive applications, contact Diodes for qualified alternatives like the PAM8019E-A.