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Diodes Incorporated PAM8304ASR
- Part No.:
- PAM8304ASR
- Manufacturer:
- Diodes Incorporated
- Category:
- Audio Amplifiers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
PAM8304ASR.pdf
- Description:
- IC AMP CLASS D MONO 3W 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:29,779
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Product details
Overview
PAM8304ASR from Diodes Incorporated is a mono, filter-less Class-D audio amplifier with differential input, 3W output into 4Ω at 5V/10% THD, 90% peak efficiency, and 2.8–6.0V supply range-designed for portable battery-powered audio systems such as MP3 players and digital photo frames.
For engineers reviewing the PAM8304ASR datasheet, PAM8304ASR pinout, PAM8304ASR application, or PAM8304ASR equivalent, key selection criteria include its BTL output architecture, shutdown current <1μA, thermal/short-circuit protection, and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The PAM8304ASR implements a PWM-based Class-D topology with integrated gate drivers, undervoltage lockout (UVLO) triggering at 2.5V, and anti-pop circuitry that ramps internal reference voltage to VDD/2 before enabling output. Its differential input stage rejects common-mode noise while supporting 18dB fixed gain.
It features dual-level protection: short-circuit detection disables outputs immediately, and overtemperature protection (OTP) shuts down at ~150°C junction temperature-auto-recovering after die cools by 40°C. The 400kHz switching frequency balances EMI suppression and efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 3.0W @ 10% THD, 4Ω, 5V supply - delivers full loudness in compact speakers without heatsinking |
| Supply Range | 2.8V to 6.0V - supports 3–4 alkaline cells or single Li-ion with LDO pre-regulation |
| THD+N | 0.14% @ 1W, 8Ω, 1kHz - ensures clean audio reproduction with minimal harmonic distortion |
| Efficiency | 93% @ 1W, 8Ω - extends battery life and reduces thermal load in sealed enclosures |
| Shutdown Current | <1μA - enables ultra-low-power standby in always-on portable devices |
| PSRR | −70dB @ 1kHz - rejects power rail noise without external regulators or LC filtering |
| Dynamic Range | 95dB @ 5V, 8Ω - preserves signal fidelity across quiet-to-loud passages |
Pinout & Package
Package: MSOP-8 (3.0mm × 4.9mm, 0.65mm pitch), RoHS-compliant matte tin-plated leads, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT+ | Positive BTL Output | Drives speaker positive terminal in bridge-tied-load configuration; requires no output filter capacitor |
| PVDD | Power Supply Input | High-current path for H-bridge switches; must be decoupled with 1μF ceramic + 10μF bulk capacitor |
| VDD | Analog Power Supply | Bias and control logic supply; separate from PVDD to reduce noise coupling into input stage |
| IN− | Negative Differential Input | Accepts inverted audio signal; paired with IN+ for common-mode noise rejection |
| IN+ | Positive Differential Input | Accepts non-inverted audio signal; differential pair enables DC-blocking capacitor reduction |
| /SD | Active-Low Shutdown | Logic low disables all internal circuitry; transitions cleanly to prevent pop/click during enable/disable |
| GND | Analog & Power Ground | Common return for analog and power sections; requires low-impedance star grounding to minimize noise |
| OUT− | Negative BTL Output | Drives speaker negative terminal; phase-inverted relative to OUT+ for doubled voltage swing |
Key Features
| Feature | Design Value |
|---|---|
| Filter-less BTL Output | Eliminates external LC filters-reducing BOM count, PCB area, and cost while maintaining EMI compliance via integrated ferrite-bead-ready layout |
| Differential Input Stage | Rejects >60dB of common-mode noise from shared PCB traces or noisy DC-DC converters-critical in mixed-signal portable designs |
| Integrated Anti-Pop Circuitry | Ramps internal reference to VDD/2 before enabling output-ensures zero DC offset at turn-on/turn-off, eliminating audible transients |
| Thermal Foldback Protection | Reduces output power before reaching 150°C shutdown threshold-maintains audio continuity during sustained high-volume operation |
| UVLO with Hysteresis | Enables at 2.8V and disables at 2.5V-prevents erratic behavior during battery sag or cold-start conditions |
Applications
| MP3/MP4 Players | GPS Navigation Devices |
|---|---|
|
Use Scenario: Battery-powered handheld audio playback with 3–4Ω miniature speaker. IC Role / Device Role / Timing Role: Mono Class-D amplifier delivering 3W peak power in BTL mode with no output filter. Use Value: Enables loud, clear audio from single-cell lithium or 4-cell alkaline batteries while consuming <5mA quiescent current. |
Use Scenario: In-dash or portable GPS unit requiring voice prompt clarity under engine noise. IC Role / Device Role / Timing Role: Audio driver for spoken turn-by-turn instructions with fast startup and pop-free activation. Use Value: Differential input rejects RF interference from GPS antenna; 95dB dynamic range ensures intelligible speech at low volumes. |
| Tablets & Digital Photo Frames | Portable Game Consoles |
|
Use Scenario: Slim tablet chassis with limited board space and thermal budget for multimedia alerts. IC Role / Device Role / Timing Role: Low-profile audio amplifier in MSOP-8 package driving 8Ω speaker with 93% efficiency. Use Value: Reduces heat generation and eliminates need for external filter components-saving 12mm² PCB area vs. filtered Class-AB solutions. |
Use Scenario: Handheld gaming device requiring responsive audio feedback with minimal power draw. IC Role / Device Role / Timing Role: Audio subsystem amplifier with <1μA shutdown current and fast wake-up from sleep mode. Use Value: Extends gameplay time between charges; short-circuit protection safeguards against accidental speaker wire shorts during field use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mono Class-D audio amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPA2012D2RTJR | 2.5W max into 4Ω @ 5V; requires external LC filter; 1.8–5.5V supply | Larger solution size due to filter components; lower THD+N (0.05%) but reduced output power | Preferred when ultra-low distortion outweighs PCB area and BOM count constraints |
| MAX9718ETA+ | 2.8W into 4Ω @ 5V; filter-less; 2.7–5.5V supply; 1.2μA shutdown current | Higher quiescent current (7mA vs. 5mA); same MSOP-8 footprint but different pinout (IN+/IN− swapped) | Consider only if existing layout accommodates pinout revision and higher idle power is acceptable |
Compared with TPA2012D2RTJR and MAX9718ETA+, the PAM8304ASR offers highest output power per mm² in MSOP-8, lowest shutdown current, and native pin-compatible support for differential-input noise immunity-making it optimal for cost-sensitive, space-constrained portable audio.
Availability
PAM8304ASR is available at Aetrix Electronics and suitable for MP3 players, GPS navigation units, and digital photo frames requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for PAM8304ASR 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 manufacturer of discrete semiconductors and ICs, specializing in high-efficiency power management, signal integrity, and audio solutions for consumer and industrial markets.
The PAM8304 belongs to Diodes' Class-D audio amplifier product line, engineered specifically for battery-powered portable electronics where efficiency, small footprint, and robust protection are mandatory design requirements.
FAQ
What is the maximum speaker impedance supported by the PAM8304ASR?
The PAM8304ASR is characterized for 3Ω to 8Ω loads. At 8Ω and 5V supply, it delivers 1.75W at 10% THD. Driving impedances above 8Ω is possible but reduces output power linearly and may increase THD due to reduced current capability-designers should verify thermal performance and clipping behavior in final layout.
Does the PAM8304ASR require input coupling capacitors?
Yes-input coupling capacitors (Ci) are required to bias the differential inputs at VDD/2. With typical 150kΩ input impedance and 150Hz bass extension target, a 10nF ceramic capacitor is recommended. Low-leakage type is critical to avoid DC offset and headroom loss, especially in high-gain configurations.
How does the shutdown pin (/SD) behave electrically?
The /SD pin is active-low with VIH = 1.4V min and VIL = 0.4V max at 5V supply. It exhibits hysteresis to prevent chatter near threshold. When pulled low, the device enters standby with <1μA supply current and mutes outputs; release allows automatic restart after internal reference ramp completes (~10ms).
Can the PAM8304ASR drive a piezo speaker directly?
No-piezo elements present highly capacitive loads that destabilize the Class-D output stage and violate absolute maximum ratings for output current slew rate. The PAM8304ASR is designed exclusively for resistive-inductive (voice-coil) speaker loads from 3Ω to 8Ω. Piezo drivers require dedicated high-voltage charge-pump amplifiers.
PAM8304ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Class D
- Output Type:
- 1-Channel (Mono)
- Max Output Power x Channels @ Load:
- 3W x 1 @ 4Ohm
- Voltage - Supply:
- 2.8V ~ 6V
- Features:
- Depop, Short-Circuit and Thermal Protection
- Mounting Type:
- Surface Mount
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-MSOP
PAM8304ASR FAQ
1.How can I place an order for PAM8304ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM8304ASR 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 PAM8304ASR reliable?
The price and inventory of PAM8304ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM8304ASR is usually 5 days.
3.What payment methods are accepted for PAM8304ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM8304ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM8304ASR?
PAM8304ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM8304ASR 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 PAM8304ASR?
For technical support, including PAM8304ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM8304ASR requirements.
6.How does Aetrix verify that PAM8304ASR is sourced from the original manufacturer or authorized distributors?
All PAM8304ASR 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 PAM8304ASR meets industry standards.
7.What is the process for return or replacement of PAM8304ASR?
All PAM8304ASR units undergo pre-shipment inspection (PSI). If there is an issue with PAM8304ASR, 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 PAM8304ASR part is unused and in its original packaging.
Return procedure for PAM8304ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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