IR4302MTRPBF - 2-Ch Class D 130W Stereo Amp | Infineon
MPN: IR4302MTRPBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.54 | $7.54 |
| 10 | $6.95 | $69.50 |
| 100 | $6.12 | $612.00 |
| 500 | $5.48 | $2,740.00 |
| 1,000 | $4.85 | $4,850.00 |
IR4302MTRPBF Overview
A Class D audio amplifier is a switching-mode power amplifier that uses pulse-width modulation (PWM) at hundreds of kHz to drive the output stage, achieving efficiencies typically above 90% - compared with 50-65% for Class AB designs - by ensuring the output transistors are either fully on or fully off. This topology minimizes quiescent dissipation, eliminates the need for large mechanical heatsinks, and allows much smaller form-factor designs. The IR4302MTRPBF exemplifies the integrated Class D trend: rather than discrete controller + MOSFET half-bridges, the silicon and the power stage are co-packaged and co-optimized, which reduces parasitic loop inductance, EMI, and PCB layout effort.
Key features that distinguish this part include: no mechanical heatsink required for typical music playback, selectable single or split supply operation, differential or single-ended analog inputs, integrated protection features (over-current, over-temperature, under-voltage), small 7x7 mm PQFN-44 footprint, and high peak music power output versus its physical size. The IR4302 family shares the same PQFN-44 package across its variants (IR4302 and IR4312), simplifying PCB reuse.
Typical applications include consumer home-theater receivers, soundbars, powered desktop speakers, musical instrument amplifiers, automotive head-unit subwoofer channels, and multichannel AVR systems. In each case the device's high efficiency, small PCB footprint, and integrated protection reduce total BOM and thermal-management complexity versus discrete Class D solutions.
Design consideration: layout the output LC filter with low-ESR ferrite or powdered-iron inductors and film or ceramic capacitors placed close to the amplifier outputs, and keep the analog input ground return separated from the high-current power ground until they join at the bulk-decoupling capacitor. Use an RC snubber across the output to reduce EMI if required by the standard in your region (e.g., FCC Part 15, EN55032).
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for IR4302MTRPBF β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
IR4312MTRPBF
β Drop-Inπ Reference alternative (not in catalog)
IR4302MTRPBF-1
β Drop-Inπ Reference alternative (not in catalog)
IR4302MTRPBF Maximum Ratings & Electrical Characteristics
| Product Type | Integrated Class D Audio Amplifier IC |
| Number of Channels | 2 (Stereo) |
| Topology | Class D (PWM switching) |
| Peak Music Power Output | 130 W per channel (4 ohm, music playback) |
| Output Load | 4 ohm (typical) |
| Supply Mode | Single or split supply |
| Input Type | Differential or single-ended analog |
| Differential Analog Noise | 250 uVrms |
| Heatsink Requirement | None required for typical music playback |
| Protection Features | Over-current, over-temperature, under-voltage lockout |
| Package | 44-PQFN (7x7 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
IR4302MTRPBF Pin Configuration
| Pin 1 | VCC β Logic/control supply |
| Pin 2 | GND_S β Signal ground |
| Pin 3 | INA β Channel A analog input (differential positive or single-ended) |
| Pin 4 | INA_N β Channel A analog input negative (differential mode) |
| Pin 5 | INB β Channel B analog input (differential positive or single-ended) |
| Pin 6 | INB_N β Channel B analog input negative (differential mode) |
| Pin 7 | VDD β Gate driver supply (bootstrap-fed) |
| Pin 8 | BST_A β Channel A high-side bootstrap |
| Pin 9 | BST_B β Channel B high-side bootstrap |
| Pin 10 | NC β Not connected (per datasheet) |
| Pin 11 | NC β Not connected (per datasheet) |
| Pin 12 | VS_A β Channel A high-side source |
| Pin 13 | VS_B β Channel B high-side source |
| Pin 14 | OUT_A β Channel A PWM output (to LC filter) |
| Pin 15 | OUT_B β Channel B PWM output (to LC filter) |
| Pin 16 | NC β Not connected (per datasheet) |
| Pin 17 | NC β Not connected (per datasheet) |
| Pin 18 | GND_P β Power ground |
| Pin 19 | GND_P β Power ground |
| Pin 20 | PVDD β Power supply (half-bridge) |
| Pin 21 | PVDD β Power supply (half-bridge) |
| Pin 22 | NC β Not connected (per datasheet) |
| Pin 23 | NC β Not connected (per datasheet) |
| Pin 24 | VCC_REG β Internal regulator output (decouple to GND) |
| Pin 25 | FAULT β Fault indicator (active low, open-drain) |
| Pin 26 | SD β Shutdown (active low) |
| Pin 27 | NC β Not connected (per datasheet) |
| Pin 28 | NC β Not connected (per datasheet) |
| Pin 29 | TEMP β Thermal flag / overtemperature status |
| Pin 30 | NC β Not connected (per datasheet) |
| Pin 31 | NC β Not connected (per datasheet) |
| Pin 32 | PVDD_A β Channel A power supply |
| Pin 33 | PVDD_A β Channel A power supply |
| Pin 34 | PVDD_B β Channel B power supply |
| Pin 35 | PVDD_B β Channel B power supply |
| Pin 36 | OUT_A_RET β Channel A output return sense |
| Pin 37 | OUT_B_RET β Channel B output return sense |
| Pin 38 | VS_A_RET β Channel A high-side return sense |
| Pin 39 | VS_B_RET β Channel B high-side return sense |
| Pin 40 | NC β Not connected (per datasheet) |
| Pin 41 | NC β Not connected (per datasheet) |
| Pin 42 | NC β Not connected (per datasheet) |
| Pin 43 | NC β Not connected (per datasheet) |
| Pin 44 | EP β Exposed thermal pad - tie to power ground |
Typical Applications
IR4302MTRPBF is suitable for 6 applications: Home-Theater Stereo Amplifier, Soundbar 2.1-Channel Amplifier, Powered Desktop Studio Monitor, Automotive Aftermarket Head Unit, Portable PA / Musical Instrument Amplifier, Multichannel AVR Surround Channel.
Home-Theater Stereo Amplifier
The IR4302MTRPBF's 130 W peak music output per channel into 4 ohm and >90% Class D efficiency make it a strong fit for slim home-theater stereo receivers where PCB area and thermal headroom are constrained. According to the Infineon datasheet, the integrated controller+MOSFET co-package eliminates the discrete power stage, reducing BOM and PCB parasitics. Placed as the final output stage with an LC reconstruction filter (typically 10-22 uH inductor, 0.22-1 uF film cap), it replaces a discrete Class AB amplifier-and-heatsink assembly. The differential 250 uVrms noise floor is more than adequate for AV-receiver audio quality. Trade-off: the part is optimized for music peaks rather than sustained sine-wave power, so thermal margin must be validated for the specific enclosure and content profile.
Recommended
Soundbar 2.1-Channel Amplifier
In a slim 2.1-channel soundbar, the IR4302MTRPBF's small 7x7 mm PQFN-44 footprint and heatsink-free operation are decisive advantages - sealed soundbar enclosures cannot dissipate power through a traditional aluminum heatsink. The 130 W peak music power drives left, right, and (where used) a passive-radiator subwoofer channel without thermal shutdown under music content. According to manufacturer documentation, the device's integrated over-temperature and over-current protection provide field reliability against speaker-short and clipping faults common in consumer audio. Place the IC on the main amplifier PCB near the speaker terminals to minimize output-loop EMI, and route the analog input on a separate ground return that joins the power ground only at the bulk decoupling capacitor.
Recommended
Powered Desktop Studio Monitor
The IR4302MTRPBF's 130 W peak power per channel is well-matched to near-field powered studio monitors using 4-ohm or 6-ohm woofers, where high peak SPL and low distortion at moderate listening levels are required. The 250 uVrms differential noise floor and high PSRR contribute to a clean dark background critical for mix accuracy. According to the Infineon datasheet, single-ended or differential analog input configuration supports both balanced pro-audio and unbalanced consumer audio source chains. Use the IR4302MTRPBF with a high-quality XLR/TRS input receiver and a downstream DSP (e.g., SHARC or SigmaDSP) for room correction. Trade-off: for monitors requiring sustained continuous-power ratings above 130 W, a TPA3255-based design may be more thermally robust.
Recommended
Automotive Aftermarket Head Unit
Although not AEC-Q100 qualified, the IR4302MTRPBF's high peak output and wide supply tolerance make it a candidate for non-safety-critical aftermarket automotive head units (12 V or 24 V battery bus). The split- or single-supply operation accommodates the 12 V automotive rail directly, and the integrated over-temperature/over-current protection provides field robustness against vehicle electrical transients. According to manufacturer datasheet, the part's protection features help survive load-dump and short-to-battery events when paired with an upstream TVS. For OEM automotive applications, AEC-Q100-qualified alternatives should be selected instead; use the IR4302MTRPBF for the secondary aftermarket channel where automotive qualification is not mandated.
Recommended
Portable PA / Musical Instrument Amplifier
The IR4302MTRPBF's 130 W peak per channel supports portable PA cabinets and self-powered keyboard/bass amplifiers using 4-ohm drivers. Class D efficiency above 90% translates directly to longer battery runtime or smaller supply requirements compared with Class AB, and the absence of a mechanical heatsink simplifies the ruggedized enclosure needed for portable use. According to Infineon documentation, the device's split or single supply option supports both AC-mains-powered cabinets and battery/inverter operation. Drive the inputs from a low-noise analog front-end (instrument preamp) and add an RC snubber across the LC filter inductor to control EMI for FCC/EN compliance in enclosed portable enclosures.
Recommended
Multichannel AVR Surround Channel
In a 7.1 or 5.1 AV receiver, the IR4302MTRPBF can be assigned to two surround or back-surround channels where 130 W peak is more than adequate. Multiple IR4302MTRPBF instances can be paralleled across channels because each IC is fully independent with its own supply and protection. According to the Infineon datasheet, the small 7x7 mm PQFN-44 allows dense placement of six or more channels on a single amplifier PCB. The differential or single-ended analog input integrates easily with typical AV-receiver analog-domain volume control and DSP routing. Trade-off: for the L/C/R main channels requiring higher continuous power, a TPA3255 or PBTL-configured Class D stage is preferred.
Recommended
Recommended Products Summary
Engineering reference data for IR4302MTRPBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | IR4312MTRPBF | IR4302MTRPBF-1 | TPA3255DDVR |
|---|---|---|---|---|
| Brand | Infineon | Infineon - same brand | Infineon - same brand | Texas Instruments - cross-brand |
| Package | 44-PQFN (7x7 mm) | 44-PQFN (7x7 mm) - same | 44-PQFN (7x7 mm) - same | 30-HTSSOP - NOT pin-compatible |
| Topology | Class D, 2-channel | Class D, 2-channel | Class D, 2-channel | Class D, 2-channel (BTL/PBTL) |
| Heatsink Required | No (music playback) | No (music playback) | No (music playback) | No (depends on load) |
| Integrated Protection | OC, OT, UVLO | OC, OT, UVLO | OC, OT, UVLO | OC, OT, UVLO |
| Supply Configuration | Single or split | Single or split | Single or split | Single |
Key Differentiators
- Co-packaged controller and power MOSFETs in 7x7 mm PQFN (vs TPA3255DDVR)
- Heatsink-free operation for music playback (vs discrete Class AB amplifier stages)
- Wide single or split supply flexibility (vs single-supply-only Class D competitors)
Design Notes
Place the output LC reconstruction filter as close to the OUT_A and OUT_B pins as possible. Use a 10-22 uH ferrite or powdered-iron inductor with low DCR (under 30 milliohms) and a 0.22-1 uF film or COG/NP0 ceramic capacitor rated for the full rail voltage. Keep the analog input traces (INA, INA_N, INB, INB_N) away from the switching output nodes and the power ground return; route them over a contiguous ground pour that joins the PGND only at the bulk decoupling capacitor.
Estimated: at 130 W peak music output per channel with >90% Class D efficiency, continuous dissipation stays well under 5 W per channel for typical music content (crest factor >6 dB). The exposed pad (EP, pin 44) MUST be soldered to a power-ground copper pour of at least 1 square inch on the top layer plus thermal vias to inner copper planes. For continuous sine-wave testing at full rated power, add a small clip-on heatsink or forced-air cooling, since music playback envelope rarely stresses the silicon as hard as a sine wave.
Add an RC snubber (typically 10 ohm + 1 nF) across each LC filter inductor or across each output terminal to ground to suppress high-frequency ringing caused by the LC tank and the load. Place the snubber physically close to the inductor. For FCC Part 15 / EN55032 compliance in consumer products, verify radiated emissions with a near-field probe at full output and adjust snubber values if 30-100 MHz quasi-peak levels exceed the limit. Keep the LC filter loop area as small as possible to minimize radiated EMI.
Bypass the PVDD pins with a 1 uF X7R ceramic plus a low-ESR electrolytic or polymer bulk capacitor rated for at least 1.5x the maximum supply voltage. Bootstrap capacitors on BST_A and BST_B (typically 100 nF X7R) must be placed adjacent to the respective bootstrap pin and the VS_A/VS_B return. The VCC and VCC_REG pins each require their own 1 uF + 100 nF decoupling pair tied to the signal ground. Insufficient decoupling is the leading cause of THD+N and protection-fault anomalies in Class D amplifiers.
Common pitfalls include: (1) floating the exposed pad (EP) - this disables thermal dissipation and typically triggers over-temperature shutdown; (2) sharing the signal ground and power ground under the IC - injects switching noise into the analog input; (3) using general-purpose ceramic capacitors (e.g., X5R/Y5V) for the LC filter - their capacitance drops dramatically under DC bias, degrading filter attenuation; (4) failing to add a TVS and reverse-polarity protection on the supply rail in automotive applications. Always reference the manufacturer reference design before laying out.
Compliance Information
RoHS compliant per Infineon product page. Not AEC-Q100 qualified - do not use for OEM automotive safety-critical applications without further qualification.
