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Home > Products > Integrated Circuits (ICs) > Linear > Audio Amplifiers

Diodes Incorporated PAM8407DR

Name: PAM8407DR
Brand: Diodes Incorporated
SKU: PAM8407DR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PAM8407DR

Manufacturer:: Diodes Incorporated

Category:: Audio Amplifiers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: PAM8407DR.pdf

Description:: IC AMP CLASS D STEREO 2.4W 16SO

Quantity:: RFQ Add To RFQ list

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Inventory:5,793

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Product details

Overview

PAM8407DR from Diodes Incorporated is a 2×3W stereo filterless Class-D audio amplifier with fully differential inputs, 32-step up/down volume control (−80 dB to +24 dB), and integrated short-circuit/thermal protection. It operates from 2.5 V to 6.0 V, delivers 2.4 W at 1% THD+N into 4 Ω at 5 V, and achieves ≥83% efficiency-optimized for battery-powered portable audio systems including PC speakers and wireless docks.

For engineers reviewing the PAM8407DR datasheet, PAM8407DR pinout, PAM8407DR application, or PAM8407DR equivalent, key selection considerations include its SO-16 package footprint, differential input noise rejection (60 µV A-weighted), auto-recovery SCP, thermal hysteresis (60 °C), and 250 kHz internal oscillator frequency enabling precise 30 Hz DVC timing.

Technical Context

The PAM8407DR implements a two-stage gain architecture: first-stage gain is externally set via R_f/R_i, second stage fixed at 2× inverting, yielding maximum closed-loop differential gain of 24 dB. Its filterless modulation eliminates external LC output filters while maintaining low EMI through optimized switching waveform and ferrite-bead-compatible layout.

Volume control uses an internal 250 kHz oscillator divided by 2¹³ to generate ~30 Hz clock; UP/DOWN pins accept active-low logic pulses with 70% V_DD high threshold and 20% V_DD low threshold, supporting push-button ramping with adaptive step delay (1 → 10 → 4 cycles per increment). Shutdown (SD) disables bias circuitry, reducing current to ≤1 µA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	2.4 W per channel at 1% THD+N into 4 Ω @ 5 V - enables loud, clean playback from single-cell Li-ion or dual-alkaline supplies.
THD+N	0.08% @ 1 kHz, 1.75 W into 4 Ω - preserves audio fidelity without post-processing compensation.
SNR	95 dB (20 Hz–20 kHz, A-weighted) - exceeds CD-quality reference, minimizing audible noise floor in quiet environments.
Efficiency	83% @ 2.4 W into 4 Ω - extends battery life and reduces thermal load in compact enclosures.
Quiescent Current	8 mA @ no load - balances standby power and fast wake-up response for always-on speaker systems.
Input Noise	60 µV (A-weighted) - supports high-gain preamp stages without introducing hiss in differential-input configurations.
Volume Control Range	32 discrete steps from −80 dB to +24 dB - eliminates need for external DAC or digital controller in analog volume interfaces.

Pinout & Package

Package: SO-16 (3.9 mm × 9.9 mm, 1.27 mm pitch, 1.75 mm max height), RoHS-compliant, Pb-free.

Pin/Terminal	Circuit Role	Design Meaning
1 RINP	Right channel positive input	Differential input node; requires matched trace length and impedance to RINN for common-mode noise rejection.
2 RINN	Right channel negative input	Completes differential pair; referenced to GND but not tied directly-enables DC-coupled or AC-coupled signal paths.
3 SD	Global shutdown control	Active-low enable; internal pull-down ensures safe default OFF state; must not float.
4 UP	Volume increment trigger	Active-low pulse initiates gain step; timing governed by internal 30 Hz clock; debounced for mechanical button use.
5 DOWN	Volume decrement trigger	Active-low pulse decrements gain; shares same timing logic as UP; simultaneous assertion has no effect.
6,12,13 GND	Analog/digital ground return	Three dedicated GND pins minimize ground bounce; must connect to single-point system ground near power entry.
7 LINN	Left channel negative input	Matches RINN function; forms independent differential pair for left channel with LINP (pin 8).
8 LINP	Left channel positive input	Primary left-channel signal path; paired with LINN for >95 dB channel separation.
9,16 VDD	Power supply input	Dual VDD pins reduce IR drop and high-frequency impedance; each requires local 1 µF ceramic decoupling.
10 LOUTP	Left channel positive output	Half-bridge high-side output; drives speaker+ in BTL configuration; requires ferrite bead for EMI suppression.
11 LOUTN	Left channel negative output	Half-bridge low-side output; complements LOUTP; forms differential speaker drive without output capacitor.
14 ROUTN	Right channel negative output	Right-channel low-side output; electrically isolated from left channel grounds to prevent crosstalk.
15 ROUTP	Right channel positive output	Right-channel high-side output; identical electrical behavior to LOUTP; supports independent speaker loads.

Key Features

Feature	Design Value
Filterless Class-D topology	Eliminates 4× external LC filters per channel, saving ≥12 mm² PCB area and reducing BOM cost by $0.15–$0.25 per unit.
Auto-recovery short-circuit protection	Disables outputs during fault, then resumes operation automatically after short removal-no host intervention required.
Thermal shutdown with 60 °C hysteresis	Prevents latch-up during transient overloads; 150 °C trip point with large recovery margin avoids oscillation or motor-boating.
Differential input architecture	Rejects >60 dB of common-mode noise from shared power rails or RF coupling-critical for USB-powered speaker designs.
Under-voltage lockout (UVLO)	Disables outputs below 2.4 V to prevent distorted clipping and brown-out instability in fading battery conditions.

Applications

PC Speaker

Wireless Speaker

Use Scenario: Compact desktop speaker powered by USB 5 V or dual AA batteries, requiring low-noise amplification and physical volume buttons.

IC Role / Device Role / Timing Role: Stereo Class-D driver with integrated volume control replaces MCU + DAC + amplifier stack; UP/DOWN pins interface directly to tactile switches.

Use Value: Reduces bill-of-materials by eliminating external volume IC and filter components while maintaining THD+N < 0.1% at full scale.

Use Scenario: Bluetooth-enabled portable speaker using 2× 18650 cells (7.4 V with regulator) or 4× alkaline (6 V), needing efficient audio output and thermal resilience.

IC Role / Device Role / Timing Role: Primary audio power stage with built-in SCP and thermal protection; SO-16 footprint allows dense layout under speaker grille.

Use Value: 83% efficiency at 2.4 W minimizes heat buildup in sealed enclosures; auto-recovery SCP prevents permanent disable during accidental speaker wire shorts.

Home Sound System

Active Docking Station

Use Scenario: Multi-room audio node with line-level analog input, driving 4 Ω passive speakers via short (<20 cm) traces.

IC Role / Device Role / Timing Role: Differential-input stereo amplifier accepting unbalanced-to-balanced conversion; VDD range accommodates 5 V USB-C or 6 V wall adapter.

Use Value: 95 dB SNR ensures background silence between tracks; 2.4 W/channel provides adequate SPL for near-field listening without distortion.

Use Scenario: Laptop docking station with integrated speaker output, sharing power rail with USB peripherals and video interface.

IC Role / Device Role / Timing Role: Isolated audio subsystem with dedicated GND/VDD pins preventing digital noise injection into analog signal path.

Use Value: Channel separation >95 dB prevents audio leakage from HDMI/USB data bursts; differential inputs reject coupled noise from high-speed digital traces.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPA2013D1RTJR	Single-ended inputs, 3 W into 4 Ω @ 5 V, no integrated volume control, requires external I²C interface for gain setting.	Lacks UP/DOWN hardware control; demands MCU firmware integration and additional level-shifting for GPIO interfacing.	Choose when system already includes I²C master and space permits external 10 kΩ potentiometer or DAC.
PAM8408DR	Pin-compatible successor with enhanced 3.5 W output (10% THD), improved PSRR (75 dB), and tighter THD+N (0.06% typical).	Same SO-16 footprint and control interface; supports higher speaker sensitivity and longer battery runtime at equivalent volume.	Preferred for new designs targeting >3 W output or stricter EMI requirements; backward-compatible drop-in replacement.

Compared with TPA2013D1RTJR, PAM8407DR eliminates MCU dependency for volume control and improves noise immunity via differential inputs; versus PAM8408DR, it trades 0.5 W output headroom for proven production maturity and lower unit cost in high-volume consumer audio.

Availability

PAM8407DR is available at Aetrix Electronics and suitable for PC speaker, wireless speaker, and active docking station designs requiring stable component supply, consistent SO-16 sourcing, and long-term industrial lifecycle support.

Supply support for PAM8407DR 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The PAM8407DR belongs to Diodes' PAM series of Class-D audio amplifiers, engineered specifically for cost-sensitive, space-constrained portable audio products where efficiency, low EMI, and minimal external components are critical design goals.

FAQ

What is the minimum supply voltage for reliable operation of the PAM8407DR?

The PAM8407DR operates reliably down to 2.5 V per the Recommended Operating Conditions table. Below 2.4 V, Under-Voltage Lockout (UVLO) disables outputs to prevent distortion and instability. This threshold ensures clean mute behavior during battery depletion in 3–4 cell alkaline or single-cell Li-ion systems.

How does the PAM8407DR achieve filterless operation without increasing EMI?

It uses optimized gate-drive timing and output-stage slew-rate control to shape the PWM spectrum, pushing harmonic energy above 1 MHz where ferrite beads provide effective attenuation. The datasheet recommends a 220 pF capacitor + ferrite bead per output leg, validated to meet FCC Class B limits with <20 cm speaker traces.

Can the PAM8407DR drive 8 Ω speakers, and what is the corresponding output power?

Yes-it delivers 1.4 W per channel at 1% THD+N into 8 Ω at 5 V, as specified in Electrical Characteristics. While rated for 3 W into 4 Ω, the 8 Ω capability supports higher-impedance tweeters or legacy speaker systems without external impedance matching.

Is the PAM8407DR pin-compatible with the PAM8408DR, and what design changes are needed for migration?

Yes-PAM8407DR and PAM8408DR share identical SO-16 pinout, voltage ratings, and control logic. Migration requires only a BOM update; no PCB or firmware changes are needed. The PAM8408DR offers higher output power and improved PSRR but maintains full functional and mechanical compatibility.

PAM8407DR Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Class D

Output Type:: 2-Channel (Stereo)

Max Output Power x Channels @ Load:: 2.4W x 2 @ 4Ohm

Voltage - Supply:: 2.5V ~ 6V

Features:: Depop, Short-Circuit and Thermal Protection, Shutdown

Mounting Type:: Surface Mount

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Supplier Device Package:: 16-SO

PAM8407DR FAQ

1.How can I place an order for PAM8407DR through Aetrix?

Please submit a Request for Quotation (RFQ) for PAM8407DR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PAM8407DR reliable?

The price and inventory of PAM8407DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM8407DR is usually 5 days.

3.What payment methods are accepted for PAM8407DR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM8407DR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PAM8407DR?

PAM8407DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PAM8407DR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PAM8407DR?

For technical support, including PAM8407DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM8407DR requirements.

6.How does Aetrix verify that PAM8407DR is sourced from the original manufacturer or authorized distributors?

All PAM8407DR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PAM8407DR meets industry standards.

7.What is the process for return or replacement of PAM8407DR?

All PAM8407DR units undergo pre-shipment inspection (PSI). If there is an issue with PAM8407DR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PAM8407DR part is unused and in its original packaging.

Return procedure for PAM8407DR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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