SI4112-BT - 1 GHz Dual-Band RF Synthesizer | Silicon Labs
MPN: SI4112-BT ✗ End of Life| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
SI4112-BT Overview
An RF synthesizer is a clock-and-timing semiconductor that generates a controlled output frequency from a reference source. In the broader hierarchy, this product is an RF frequency synthesizer, part of clock and timing ICs, and ultimately a semiconductor used to establish the carrier or local-oscillator signal in a wireless transmitter or receiver. Its integrated VCOs reduce the number of separate frequency-generation components needed in RF designs.
The verified distributor information identifies the SI4112-BT as a frequency-synthesizer IC operating up to 1 GHz and packages it as 24-TSSOP, or 0.173-inch by 4.40 mm width. Search results also describe the device as a dual-band RF synthesizer with integrated VCOs for wireless communications. Detailed phase-noise, tuning-range, supply-voltage, output-power, temperature, and lock-time figures were not included in the supplied source data and should be confirmed from the manufacturer datasheet before design release.
The SI4112-BT fits RF front ends, wireless transceivers, local-oscillator generation, modulation and demodulation chains, and communication equipment requiring a programmable RF reference. Integrated VCOs are particularly useful when board area and external frequency-generation complexity are priorities, although loop-filter, reference, and RF-layout requirements still need careful validation.
For a new layout, preserve the 24-TSSOP footprint and verify every pin function against the applicable datasheet revision. Do not infer programming, charge-pump, reference, or supply connections from the family description alone; the supplied evidence confirms the device identity and broad frequency-synthesizer role, but not a complete electrical pin map. Validate RF trace impedance, keep the synthesizer reference path short, and test tuning and lock behavior across the intended channel plan.
Drop-in alternatives for SI4112-BT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SI4112-BT (same form factor and footprint) — differing in Package, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SI4112-D-GM
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →SI4112-D-GTR
✅ Drop-In📋 Reference alternative (not in catalog)
SI4113-BT
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →SI4122-D-GT
✅ Drop-In📋 Reference alternative (not in catalog)
SI4112-BT
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →SI4112-BT Specifications
| Device Type | Dual-band RF frequency synthesizer with integrated VCOs |
| Maximum Stated Frequency | 1 GHz |
| Output Count | 1 |
| Package | 24-TSSOP, 0.173 inch, 4.40 mm width |
| Mounting Type | Surface mount |
| Application Category | Wireless communications RF signal generation |
| Integrated VCOs | Integrated VCOs specified by search result description |
SI4112-BT 24-tssop, 0.173 inch, 4.40 mm width Pin Configuration Guide
Pin configuration for SI4112-BT (24-tssop, 0.173 inch, 4.40 mm width 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 SI4112-BT.
Refer to the datasheet for full pin configuration.
Typical Applications
SI4112-BT is suitable for 6 applications: Wireless Transceiver Local Oscillator, Dual-Band RF Signal Generation, RF Modulation and Demodulation Chain, Wireless Communication Test Equipment, RF Communication Front End, Portable Wireless Control Systems.
Wireless Transceiver Local Oscillator
SI4112-BT is a natural candidate for a programmable RF local-oscillator stage in wireless transceivers because the verified description identifies a dual-band RF synthesizer with integrated VCOs and a stated capability up to 1 GHz. Place it where the receiver or transmitter requires a synthesized reference rather than a fixed crystal-derived tone. Confirm the actual tuning range, phase-noise limits, output power, lock time, and reference requirements before committing to a channel plan. The integrated-VCO architecture may simplify the RF signal chain, but it does not remove the need for controlled-impedance routing, decoupling, and loop-layout validation.
Recommended
Dual-Band RF Signal Generation
Use SI4112-BT where a wireless design requires synthesized RF generation across two operating bands or related frequency plans. Its supplied description explicitly calls it a dual-band RF synthesizer, while the distributor result confirms a maximum stated frequency of 1 GHz and one output. The actual band ranges are not included in the evidence, so engineers must verify the datasheet’s tuning table and synthesizer settings against every RF channel. This application benefits from a clean reference source and careful isolation between sensitive receiver nodes and the synthesizer output.
Recommended
RF Modulation and Demodulation Chain
SI4112-BT can support modulation or demodulation systems that require a programmable RF carrier or local reference. The integrated-VCO description makes it relevant to compact wireless signal-generation blocks, but the verified data does not provide modulation bandwidth, spur performance, or phase-noise figures. Before implementation, characterize the synthesizer output at the required channel frequencies and confirm that its phase noise and spur levels meet the receiver’s sensitivity and adjacent-channel requirements. Place the RF output and reference connections according to the manufacturer’s recommended layout.
Recommended
Wireless Communication Test Equipment
SI4112-BT may be useful in RF test and measurement equipment that generates controlled carrier signals for transmitter, receiver, or modulation-chain evaluation. Its verified 1 GHz stated capability provides a useful starting point for many RF test scenarios, but the supplied evidence does not define output power accuracy or tuning resolution. The synthesizer should be paired with verified calibration paths, power-level measurement equipment, and a reference source appropriate to the required frequency plan. Temperature, aging, lock behavior, and long-term stability must be tested before production use.
Recommended
RF Communication Front End
SI4112-BT is relevant to the frequency-generation portion of an RF communication front end because it is identified as a high-frequency synthesizer with integrated VCOs. The verified package is 24-TSSOP, making it useful for compact board layouts where a separate VCO arrangement is undesirable. However, the available sources do not establish input sensitivity, isolation, output power, or regulatory parameters. Evaluate the complete front end, including antenna interfaces, filtering, amplifiers, and reference-clock architecture, rather than treating the synthesizer as a complete RF transmitter or receiver.
Recommended
Portable Wireless Control Systems
For battery-powered or portable wireless equipment, SI4112-BT can serve as the RF frequency-generation element when its verified 1 GHz capability matches the design. The integrated-VCO description may reduce external RF component count, while the 24-TSSOP package supports standard surface-mount assembly. Power consumption, supply voltage, output level, and thermal performance are not provided in the verified data, so battery-life and thermal analysis cannot be completed from this page alone. Confirm low-power modes and operating-temperature limits in the manufacturer datasheet before selecting it for mobile equipment.
Recommended
Recommended Products Summary
Engineering reference data for SI4112-BT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI4112-D-GM | SI4112-D-GTR | SI4113-BT | SI4122-D-GT | SI4112-BT |
|---|---|---|---|---|---|---|
| Brand | Silicon Labs | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Silicon Labs | Skyworks Solutions Inc. | Silicon Labs |
| Frequency Synthesizer Function | RF frequency synthesis | RF synthesis stated | RF synthesis stated | Related synthesizer function | RF synthesis stated | RF frequency synthesis |
| Wireless Communications Positioning | Yes | Precision timing and communication systems stated | Related communication synthesizer comparison | Related wireless synthesizer comparison | RF wireless positioning stated | Wireless communications positioning stated |
Key Differentiators
- Verified 1 GHz stated synthesizer capability (vs SI4112-D-GM)
- Explicit dual-band and integrated-VCO positioning (vs SI4122-D-GT)
- Single-output 24-TSSOP identity is directly stated (vs SI4113-BT)
Design Notes
Treat the RF output and reference paths as controlled-impedance structures and verify the exact pin assignments, recommended termination, and keepout guidance from the applicable Silicon Labs datasheet. The supplied evidence confirms a 24-TSSOP package but does not provide the pin map, so do not route power, control, or RF connections from assumptions based only on similar synthesizer families.
Use a low-noise reference source and place the synthesizer’s reference and decoupling connections according to the manufacturer’s recommended layout. Because phase noise, reference sensitivity, and lock behavior are not supplied, evaluate them experimentally with the intended carrier frequencies. Separate sensitive receive paths from the RF synthesizer output and verify isolation in the assembled board.
Do not assume that a related SI4112, SI4113, or SI4122-family device is a drop-in replacement merely because search results show a TSSOP package. Verify pin names, supply voltage, control interface, tuning range, VCO settings, output level, and register behavior against the exact datasheet. An unverified substitution can change RF performance even when the package outline appears similar.
Compliance Information
Compliance status was not present in the supplied verified web data and must be confirmed from the manufacturer or authorized distributor documentation.
