Si475x (SI4750-A10) - Automotive AM/FM Radio Receiver | Skyworks
MPN: SI4750-A10 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.55 | $255.00 |
| 500 | $2.3 | $1,150.00 |
| 1,000 | $2.05 | $2,050.00 |
SI4750-A10 Overview
An integrated radio receiver IC combines the RF front end, mixer, IF filtering, demodulation, and audio processing on a single silicon die. Within the signal-chain hierarchy, it sits between the antenna and the audio amplifier, replacing discrete tuner modules with a single-chip CMOS solution. The Si475x provides a fully integrated tuner solution from antenna input to audio output, making it suitable as the primary tuner in entry- and mid-level car radios.
Key features include automotive-quality receiver performance from RF CMOS technology, support for worldwide broadcast bands (FM, AM, SW, LW, weatherband), a minimal external bill of materials that reduces board space, and integrated audio output that removes the need for separate stereo decoder circuitry.
Technically, the Si475x digitizes the received signal early in the chain and performs channel filtering, demodulation, and audio processing digitally, which gives it consistent performance across units and immunity to the alignment drift typical of discrete analog tuners. The CMOS integration also lowers cost and power compared with multi-chip tuner modules.
Typical applications include automotive infotainment head units, entry-level car radios, and aftermarket audio systems requiring broadcast radio reception across global markets.
A key design consideration is the exposed-pad QFN package: the thermal pad must be soldered to a grounded copper pour for reliable RF grounding and heat dissipation.
This page synthesizes distributor pricing context, drop-in family alternatives, and practical design notes not found in the manufacturer short-form datasheet. Prices cited are as of 2026-10-10.
Drop-in alternatives for SI4750-A10 — 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:
SI4750-A10-AM
✅ Drop-In📋 Reference alternative (not in catalog)
SI4750-A40-AM
✅ Drop-In📋 Reference alternative (not in catalog)
SI4755-A10-AM
✅ Drop-In📋 Reference alternative (not in catalog)
SI4754-A10-GM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SI4757-A10-GM
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SI4750-A10 Specifications
| Product Family | Si475x (Si475x-A10) |
| Function | High Performance Automotive AM/FM Radio Receiver |
| Technology | 100% RF CMOS integrated tuner |
| Frequency Range (AM) | 520 kHz to 1.71 MHz |
| Frequency Range (FM) | 64 MHz to 108 MHz |
| Supported Bands | FM, AM, SW, LW, Weatherband |
| Integration Level | Antenna input to audio output, single chip |
| Application Segment | Automotive infotainment (entry/mid-level head units) |
| Grade | Automotive grade |
| Package | 32-VFQFN Exposed Pad (5x5 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
SI4750-A10 32-vfqfn exposed pad (5x5 mm) Pin Configuration Guide
Pin configuration for SI4750-A10 (32-vfqfn exposed pad (5x5 mm) 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 SI4750-A10.
Refer to the datasheet for full pin configuration.
Typical Applications
SI4750-A10 is suitable for 6 applications: Automotive Infotainment Head Units, Entry-Level Car Radios, Aftermarket and Marine Audio Systems, Commercial Vehicle and Fleet Radios, Two-Way and Emergency Vehicle Broadcast Receivers, Embedded Broadcast Data Loggers.
Automotive Infotainment Head Units
The Si475x is explicitly positioned by Skyworks as the most integrated high-performance automotive-grade radio receiver for entry and mid-level car radios and infotainment head units. Its RF CMOS architecture delivers broadcast-quality FM (64-108 MHz) and AM (520 kHz-1.71 MHz) reception with the repeatability of a digital CMOS process, while the single-chip antenna-to-audio integration removes the multi-chip tuner module traditionally required. Placed directly after the antenna input network with its exposed pad grounded to the chassis ground pour, the Si475x outputs processed audio to the head unit amplifier, cutting board area and BOM cost in cost-sensitive vehicle platforms while maintaining worldwide band coverage.
Recommended
Entry-Level Car Radios
For 1-DIN and 2-DIN entry-level car radios where bill-of-materials cost dominates, the Si475x specifies a minimal external component count, per the Skyworks short datasheet, which shrinks tuner section board space dramatically versus discrete varactor-tuned front ends. The 32-VFQFN (5x5 mm) package fits compact radio PCBs, and the -40C to +85C automotive operating range removes the need for a second, consumer-grade tuner SKU. Because demodulation and audio processing are integrated, the radio maker needs only a power amplifier stage after the Si475x audio output, simplifying acoustics design and factory alignment, since no IF alignment step is required with the CMOS digital architecture.
Recommended
Aftermarket and Marine Audio Systems
Aftermarket head units and marine/leisure-vehicle radios benefit from the Si475x worldwide band support - FM 64 MHz to 108 MHz, AM 520 kHz to 1.71 MHz, plus shortwave, longwave, and weatherband per the Si475x-A10 datasheet. Weatherband reception is especially relevant for marine and North American RV products where NOAA weather channels are a selling point. The CMOS receiver maintains sensitivity without periodic alignment, important for products serviced in the field, and the small 5x5 mm QFN allows tuner placement near the antenna connector to keep the RF path short in electrically crowded enclosures with Bluetooth and amplifier circuitry nearby.
Recommended
Commercial Vehicle and Fleet Radios
Trucks, buses, and agricultural equipment use simple, robust AM/FM radios where the Si475x automotive-grade CMOS receiver provides consistent reception across geographies - AM bands differ by region (520-1710 kHz) and the Si475x covers worldwide FM and AM in one order code, simplifying platform variants. Its digital demodulation is less sensitive to vibration-induced misalignment than mechanically tuned alternatives, and the -40C to +85C rating covers unheated cab environments. Designers should provide a filtered supply (the tuner is sensitive to alternator ripple on the rail) and route the antenna feeder away from high-current wiring harnesses typical in commercial vehicle installations.
Recommended
Two-Way and Emergency Vehicle Broadcast Receivers
Emergency and service vehicles often require a standby broadcast receiver for public announcements in addition to dispatch radios. The Si475x single-chip tuner adds full AM/FM/weatherband reception in 5x5 mm, leaving panel space and budget for the primary communication electronics. Because it integrates demodulation digitally, audio quality stays consistent even with the electrically noisy environment of vehicles equipped with sirens, inverters, and lighting controllers; careful grounding of the exposed pad to the vehicle ground plane and shielded antenna feeder preserve sensitivity. The integrated architecture also shortens qualification time since RF tuning parameters are factory-set in silicon rather than aligned per unit.
Recommended
Embedded Broadcast Data Loggers
Telemetry and media-monitoring systems that record broadcast content - for compliance logging, advertising verification, or news monitoring - can use the Si475x as a compact, low-cost multi-band front end. Its worldwide FM/AM/SW/LW coverage lets one hardware SKU monitor stations across regions, and the CMOS digital architecture provides repeatable signal readings across production units, improving log comparability. The receiver output feeds an ADC or codec for recording, while a host microcontroller manages tuning. The minimal BOM allows dense multi-tuner cards (several Si475x units per PCB) for simultaneous multi-station monitoring, provided each tuner has its own clean supply and grounded exposed pad.
Recommended
Recommended Products Summary
Engineering reference data for SI4750-A10 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI4750-A10-AM | SI4750-A40-AM | SI4755-A10-AM | SI4757-A10-GM |
|---|---|---|---|---|---|
| Package | 32-VFQFN Exposed Pad (5x5 mm) | 32-VFQFN Exposed Pad (5x5 mm) - same | 32-QFN (5x5) - same | 32-VFQFN Exposed Pad (5x5 mm) - same | 32-VFQFN Exposed Pad (5x5 mm) - same |
| Brand | Skyworks Solutions (Silicon Laboratories) | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
| Frequency Coverage | AM 520 kHz-1.71 MHz; FM 64-108 MHz | AM 520 kHz-1.71 MHz; FM 64-108 MHz | AM 520 kHz-1.71 MHz; FM 64-108 MHz | AM/FM per Si475x family | AM/FM + extended band features |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Automotive Grade | Yes | Yes | Yes | Yes | Yes |
| Revision Status | A10 (original release) | A10 | A40 (current, DigiKey stocked) | A10 | A10 |
Key Differentiators
- Most integrated automotive tuner available in its class (vs SI4750-A40-AM (older-generation discrete tuner modules))
- Current-revision availability for new production (vs SI4750-A10-AM)
- Automotive temperature range in a consumer-cost package (vs SI4755-A10-AM (general-purpose classification))
Design Notes
The 32-VFQFN exposed pad is the main RF ground and thermal path for the Si475x. Design the landing pattern with a via array (typically 4-9 vias) under the pad stitched to the ground plane, and use a thermal relief solder paste segmentation if voiding is a concern. The datasheet short form specifies a minimal bill of materials, so the layout itself carries most of the RF performance: keep the antenna input network close to the antenna pin and maintain a continuous, unbroken ground plane under the entire tuner section.
Automotive supply rails carry alternator ripple, load-dump transients, and switching spikes from other ECUs. Feed the Si475x from a dedicated automotive LDO (e.g., a 5 V output part rated for 40 V transients) rather than directly from battery or a shared buck rail, and decouple each supply pin with 100 nF ceramics placed within 2 mm of the pin. Poor supply filtering manifests as audible buzz correlated with engine RPM - the most common field complaint in tuner designs.
Verify the ordering suffix before substitution within the family: A10 and A40 revisions of the SI4750 share the package and pinout but may differ in firmware-default behavior, and band/feature suffixes (AM, GM, etc.) define which bands are enabled. Confirm the exact suffix on the Skyworks ordering table in the full Si475x documentation; ordering the wrong suffix is the most frequent BOM error on this family since all variants look identical on the PCB.
Compliance Information
Automotive-grade positioning per Skyworks Si475x-A10 datasheet (-40C to +85C); formal RoHS/REACH/AEC-Q100 status not found in retrieved web data and must be confirmed on the official product page for the exact ordering suffix.
