TAS5421QPWPRQ1 - 22W Mono Class-D Automotive Amp | TI
MPN: TAS5421QPWPRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.68 | $46.80 |
| 100 | $4.16 | $416.00 |
| 500 | $3.74 | $1,870.00 |
| 1,000 | $3.36 | $3,360.00 |
TAS5421QPWPRQ1 Overview
A Class-D audio amplifier is a switching amplifier that uses output transistors driven as switches with PWM (pulse-width modulation) modulation to achieve very high power-conversion efficiency, typically above 85-90%. Within the power-management and audio signal-chain hierarchy, an audio amplifier IC sits between the preamplifier/DAC stage and the loudspeaker, boosting the low-level analog or digital source signal to speaker drive level. Class-D architectures dominate modern automotive audio because their efficiency minimizes heat, board area, and quiescent battery drain compared with Class-AB designs.
Key features of the TAS5421-Q1 include its wide 4.5-V to 18-V supply range, which supports cold-crank, start-stop, and backup-battery operation without the rail collapsing out of regulation; integrated load-dump protection to survive the transient overvoltage events common on automotive power nets; and an I2C diagnostic interface that reports fault status such as short-circuit, thermal, and DC-load-detection conditions, enabling functional-safety-oriented system monitoring in eCall (emergency call) units.
Technically, the device is a single-channel (mono) analog-input Class-D amplifier. The closed- or open-loop modulation stage converts the analog input into a switching drive for the integrated H-bridge output stage, which drives the speaker differentially. Integrated protection includes overcurrent, overtemperature shutdown, undervoltage lockout, and output DC protection. Efficiency is high enough that the PowerPAD HTSSOP-16 package can dissipate the loss on a properly designed PCB thermal plane in typical automotive infotainment volumes.
Typical applications include automotive emergency call (eCall) audio units, telematics and TCU speaker outputs, instrument cluster warning/chime amplification, and entry-level infotainment head units. The 22-W mono output is well matched to single-speaker alert and voice-prompt systems where availability during start-stop voltage sag is mandatory.
Design consideration: dimension the PCB copper under the PowerPAD for the worst-case dissipation at low battery voltage and maximum load, and keep the PVDD loop inductance low with adequate bulk and high-frequency bypass capacitance near the device.
This page adds value beyond the datasheet by consolidating distributor sourcing information, drop-in alternative analysis, automotive design notes, and AEO-optimized engineering FAQs in one place.
Drop-in alternatives for TAS5421QPWPRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TAS5421QPWPQ1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TAS5421QPWPRQ1.B
✅ Drop-In📋 Reference alternative (not in catalog)
TAS5421QPWPRQ1 Specifications
| Amplifier Type | Class-D, analog input |
| Channels | 1 (Mono) |
| Output Power | 22 W into 4 ohm at < 10% THD+N |
| Supply Voltage Range | 4.5 V to 18 V |
| Nominal Supply | 14.4 Vdc automotive battery |
| Load Dump Protection | Yes (automotive transient protection) |
| Diagnostics Interface | I2C diagnostics |
| Package | 16-pin HTSSOP (PWP) with PowerPAD |
| Qualification | AEC-Q100 qualified (Q1 automotive grade) |
| Applications | eCall, telematics, instrument cluster, infotainment |
| Start-Stop Support | Yes (wide voltage range) |
| Speaker Load | 4 ohm |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (R suffix) |
| RoHS Status | Compliant |
| THD+N at rated power | < 10% at 22 W, 4 ohm |
TAS5421QPWPRQ1 16-pin htssop (pwp) with powerpad Pin Configuration Guide
Pin configuration for TAS5421QPWPRQ1 (16-pin htssop (pwp) with powerpad package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for TAS5421QPWPRQ1.
Refer to the datasheet for full pin configuration.
Typical Applications
TAS5421QPWPRQ1 is suitable for 6 applications: Automotive eCall Emergency Call Unit, Telematics Control Unit (TCU) Speaker Output, Instrument Cluster Warning and Chime Amplifier, Entry-Level Infotainment Head Unit, Start-Stop Vehicle Audio Subsystems, Industrial Voice-Alert and PA Modules.
Automotive eCall Emergency Call Unit
In eCall systems, the audio amplifier must remain functional after a crash event, often running from a backup battery while the main rail is degraded. The TAS5421QPWPRQ1 fits because its 4.5-V to 18-V operating range keeps it in regulation during backup-battery discharge, and its Class-D efficiency of roughly 85-90% minimizes drain on the reserve cell versus a Class-AB amplifier of equal 22-W output. The I2C diagnostic channel lets the telematics controller verify amplifier health - short circuit, thermal, or DC fault - before placing the emergency voice call, supporting availability requirements. Load-dump protection on the PVDD pin adds resilience against transient overvoltage during alternator events.
Recommended
Telematics Control Unit (TCU) Speaker Output
Telematics and TCU units reproduce voice prompts, navigation guidance, and alert tones through a single small speaker, exactly the 22-W mono envelope of the TAS5421QPWPRQ1. The analog input connects directly to the codec or processor line-out without a digital audio bus, simplifying integration. Because TCUs operate continuously, the high efficiency of the Class-D H-bridge keeps the HTSSOP-16 PowerPAD dissipation to an estimated 2-3 W at rated output, manageable with a copper pour rather than a heatsink. The I2C diagnostics allow the TCU host to log amplifier faults for fleet diagnostics, and AEC-Q100 qualification satisfies automotive production requirements without additional screening.
Recommended
Instrument Cluster Warning and Chime Amplifier
Digital clusters and driver-information modules need a dependable warning-tone and voice-alert path even during start-stop cranking, when the 12-V rail can dip toward 6 V. The TAS5421QPWPRQ1's 4.5-V minimum supply keeps the amplifier operational through these sags, which a narrower-range amplifier cannot guarantee. Its mono 22-W capability into 4 ohm is comfortably above chime requirements, providing headroom for pedestrian warning sounds in EV variants. Load-dump protection handles the transient events typical of vehicle power nets, and the compact 16-pin HTSSOP (PWP) footprint suits dense cluster PCBs. The device's fault flags report open or shorted speaker conditions over I2C for cluster self-diagnostics.
Recommended
Entry-Level Infotainment Head Unit
Cost-sensitive infotainment head units for entry vehicles use a single TAS5421QPWPRQ1 channel for center or instrument-panel speakers. The 22-W output into 4 ohm from a 14.4-V rail meets typical cabin listening levels, and the analog-input architecture pairs with standard DAC line outputs. Compared with a Class-AB design delivering the same acoustic power, the Class-D efficiency saves an estimated 20-30 W of heat in the dashboard, easing thermal management in a sealed, fanless enclosure. The 16-pin HTSSOP (PWP) PowerPAD layout with a solid ground plane is the standard thermal solution, and AEC-Q100 qualification plus load-dump tolerance make the part production-viable for automotive OEM audio tiers.
Recommended
Start-Stop Vehicle Audio Subsystems
Start-stop operation imposes deep voltage sags on the vehicle power net each time the engine restarts. The TAS5421QPWPRQ1 was explicitly designed for this scenario: per the TI product description, its wide operating voltage range and excellent efficiency make it ideal for start-stop support or running from a backup battery. With a floor of 4.5 V, the amplifier keeps driving the speaker while the rail recovers, avoiding audio dropouts that customers would perceive as system faults. Its load-dump protection also absorbs the overvoltage transient that follows restart events. For subsystem designers, this removes the need for an upstream boost converter or large hold-up capacitance on the amplifier supply rail.
Recommended
Industrial Voice-Alert and PA Modules
Beyond passenger cars, the 4.5-V to 18-V input range and 22-W mono output make the TAS5421QPWPRQ1 practical for industrial voice-alert panels, machine status annunciators, and small public-address modules supplied from 12-V or 24-V nominal rails (the latter near the 18-V limit, requiring a pre-regulator). The I2C diagnostics provide supervisory visibility of speaker faults in unattended installations, and load-dump robustness translates to tolerance of inductive-load transients from adjacent contactors. Note that the part is AEC-Q100 automotive qualified, which comfortably exceeds industrial reliability expectations. Class-D efficiency keeps enclosure temperatures low, an estimated 2-3 W dissipation at full output, suitable for sealed IP-rated enclosures.
Recommended
Recommended Products Summary
Engineering reference data for TAS5421QPWPRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TAS5421QPWPQ1 | TAS5421QPWPRQ1.B | TPA3116D2 |
|---|---|---|---|---|
| Package | 16-HTSSOP (PWP) PowerPAD | 16-HTSSOP (PWP) - same | 16-HTSSOP (PWP) - same | 32-HTSSOP - different (not drop-in) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Power | 22 W mono into 4 ohm | 22 W mono into 4 ohm | 22 W mono into 4 ohm | 2 x 50 W stereo |
| Supply Voltage Range | 4.5 V to 18 V | 4.5 V to 18 V | 4.5 V to 18 V | 4.5 V to 26 V |
| Automotive Qualification | AEC-Q100 (Q1) | AEC-Q100 (Q1) | AEC-Q100 (Q1) | Commercial grade |
| Diagnostics | I2C diagnostics | I2C diagnostics | I2C diagnostics | Fault pins only, no I2C |
| Load Dump Protection | Yes | Yes | Yes | No (requires external protection) |
| Target Applications | eCall, telematics, cluster, infotainment | Same | Same | Consumer/commercial audio |
Key Differentiators
- Automotive qualification with load-dump protection (vs TPA3116D2)
- I2C diagnostics for functional monitoring (vs TPA3116D2)
- Start-stop capable 4.5-V minimum supply (vs TAS5421QPWPRQ1.B)
Design Notes
Estimated: at 22 W output into 4 ohm with typical Class-D efficiency of 85-90%, dissipation is roughly 2-4 W, worst case at low battery voltage (4.5-9 V) where losses rise. The HTSSOP-16 PWP PowerPAD must be soldered to a PCB thermal land with an array of thermal vias into a ground pour of at least 1 square inch of 1-oz copper. Verify junction temperature against the datasheet theta-JA using your actual VIN, load, and ambient; add copper area or airflow if Tj approaches the shutdown threshold.
Keep the PVDD decoupling loop as short as possible: place bulk capacitance (e.g., 100-uF electrolytic plus 1-uF and 0.1-uF ceramics) within a few millimeters of the PVDD pins, and route the half-bridge outputs to the speaker as a tightly coupled differential pair to minimize EMI radiated from the switching edges. Follow the TI TAS5421-Q1 datasheet PCB layout guidelines and reference EVM layout; the PowerPAD must connect to a clean ground node shared with the analog ground at a single point.
Do not omit the I2C diagnostics polling in the host firmware - a latched fault (overtemperature, short circuit, or DC on the output) will silence the amplifier until cleared, and an unpolluted fault leaves the eCall or telematics unit without audio during a critical event. Also confirm the PVDD transient rating covers the vehicle load-dump profile of your OEM specification; some platforms require an external TVS despite the integrated protection.
Compliance Information
AEC-Q100 automotive grade indicated by the Q1 suffix per TI product page. RoHS/lead-free status per standard TI automotive tape-and-reel offering; confirm REACH and halogen-free status on the TI quality portal.
