SI4113-D-ZT1 - Dual-Band 1.8GHz RF Synthesizer | Skyworks
MPN: SI4113-D-ZT1 ✗ End of LifeSI4113-D-ZT1 Overview
A frequency synthesizer is a clock-and-timing semiconductor that locks an internal voltage-controlled oscillator to a stable reference, allowing a system to generate programmable RF and intermediate-frequency signals. The SI4113-D-ZT1 belongs to the PLL frequency synthesizer family, combining phase-locked loops, voltage-controlled oscillators, frequency dividers, phase detectors, and loop filters in one integrated circuit.
The device includes three synthesis paths, integrated VCOs, loop filters, varactors, and resonators. Its RF1 range extends to 1.8 GHz, RF2 reaches 1.5 GHz, and the IF path covers 62.5 MHz to 1 GHz. Programmable power-down modes are available, and the listed standby current is 1 µA with typical operating supply current of 18 mA.
The monolithic architecture reduces the number of external RF components to a minimum of two according to the manufacturer data. This integration is valuable in wireless transmitters and receivers because the synthesizer supplies coherent, programmable frequencies while avoiding a large collection of discrete VCO, divider, detector, and filter components. Its low phase noise is another principal benefit for communications equipment.
Typical uses include dual-band wireless communications, RF transceivers, IF generation, cellular equipment, and other RF systems requiring multiple locally generated frequencies. The part operates from a 2.7 V to 3.6 V supply and is offered in a compact 24-pin TSSOP package measuring approximately 0.173 inch by 4.40 mm.
Designers should preserve adequate loop-filter bandwidth for the intended channel plan and verify that the selected reference frequency supports the required division ratios. PCB layout must keep reference and RF connections short, provide solid ground return paths, and decouple the supply close to the device. The SI4113-D-ZT1 is marked not recommended for new designs, so new equipment should evaluate the manufacturer-recommended SI4113-D-GM replacement.
This page combines verified distributor lifecycle information, manufacturer-derived operating ranges, package information, and same-footprint replacement guidance. It also provides application-focused design notes and a structured comparison to help engineers identify the correct migration path without changing the 24-pin TSSOP board footprint.
Drop-in alternatives for SI4113-D-ZT1 — 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 SI4113-D-ZT1 (same form factor and footprint) — differing in Package, Product Type, RF Outputs, RoHS Status.
SI4113-D-GM
✅ Drop-InContact for price
View Datasheet →SI4113-D-GT
✅ Drop-InContact for price
View Datasheet →SI4113-D-GTR
✅ Drop-InContact for price
View Datasheet →SI4113-BT
✅ Drop-InContact for price
View Datasheet →SI4122-D-GTR
✅ Drop-InContact for price
View Datasheet →SI4113-D-ZT1 Specifications
| Product Type | Dual-band RF frequency synthesizer IC |
| RF1 Output Frequency Range | 900 MHz to 1.8 GHz |
| RF2 Output Frequency Range | 750 MHz to 1.5 GHz |
| IF Synthesizer Frequency Range | 62.5 MHz to 1 GHz |
| Maximum Stated Output Frequency | 1.8 GHz |
| Operating Supply Voltage | 2.7 V to 3.6 V |
| Typical Supply Current | 18 mA |
| Standby Current | 1 µA |
| Number of Synthesizer Circuits | 3 |
| Minimum External Component Count | 2 components |
| Integrated Blocks | 3 VCOs, loop filters, varactors, resonators, reference divider, VCO dividers, and phase detectors |
| Power-Down Support | Programmable powerdown modes |
| Package | 24-pin TSSOP (0.173 inch, 4.40 mm width) |
| Mounting Type | Surface mount |
| Terminal Count | 24 terminals |
| Temperature Grade | Industrial |
| Termination | NiPd |
| Lead-Free Status | Lead free |
SI4113-D-ZT1 24-pin tssop (0.173 inch, 4.40 mm width) Pin Configuration Guide
Pin configuration for SI4113-D-ZT1 (24-pin 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 SI4113-D-ZT1.
Refer to the datasheet for full pin configuration.
Typical Applications
SI4113-D-ZT1 is suitable for 6 applications: Dual-Band Wireless Transceiver, RF Transceiver Local Oscillator, Cellular and Wireless RF Terminal, IF Signal Generation, RF Communications Test Equipment, Industrial Wireless Sensor Gateway.
Dual-Band Wireless Transceiver
The SI4113-D-ZT1 fits a dual-band transceiver requiring local RF and IF frequency generation because it combines RF1 operation from 900 MHz to 1.8 GHz, RF2 operation from 750 MHz to 1.5 GHz, and IF synthesis from 62.5 MHz to 1 GHz in one IC. Its three integrated VCO paths, phase detectors, dividers, and loop filters reduce the minimum external-component count to two. The 24-pin TSSOP package also avoids requiring a large RF synthesizer assembly. The principal design trade-off is its NRND lifecycle status, so an existing validated design may benefit from continuity, while a new design should first evaluate SI4113-D-GM.
Recommended
RF Transceiver Local Oscillator
The SI4113-D-ZT1 can generate programmable local oscillator signals for RF transmit and receive chains where a stable reference must control multiple synthesis paths. RF1 reaches 1.8 GHz, RF2 reaches 1.5 GHz, and the integrated phase-locked-loop architecture supports coherent frequency generation across those ranges. Its 2.7 V to 3.6 V operating range fits low-voltage RF systems, while 18 mA typical supply current and 1 µA standby current support power-sensitive portable equipment. Layout must keep the reference path and loop-filter connections short and controlled.
Recommended
Cellular and Wireless RF Terminal
A cellular or wireless terminal can use the SI4113-D-ZT1 to consolidate RF and IF synthesis rather than implementing separate oscillator chains. The device covers overlapping RF1 and RF2 bands up to 1.8 GHz and 1.5 GHz, respectively, while its IF synthesizer supports 62.5 MHz to 1 GHz. The integrated VCOs, varactors, resonators, and loop filters reduce board area and external component count to a minimum of two. The key engineering check is channel-plan-dependent loop bandwidth, because a shared synthesizer must preserve phase noise and lock performance in every active band.
Recommended
IF Signal Generation
The SI4113-D-ZT1 is appropriate for systems that need a programmable intermediate-frequency source in addition to RF outputs. Its IF synthesizer operates from 62.5 MHz to 1 GHz, allowing the same integrated device to support multiple IF plans while retaining independent RF1 and RF2 synthesis paths. This integration can simplify firmware and board partitioning in wireless receivers and test equipment. Designers should verify divider ratios, reference requirements, loop-filter settings, and output drive for the selected IF band rather than assuming settings can be transferred directly between RF and IF paths.
Recommended
RF Communications Test Equipment
The SI4113-D-ZT1 can provide programmable RF and IF sources for laboratory or embedded communications test equipment. Its RF1 capability to 1.8 GHz, RF2 capability to 1.5 GHz, and IF capability to 1 GHz support multi-range stimulus generation from one reference source. The minimum of two external components simplifies instrument front ends, and programmable powerdown modes permit controlled operating states. For precise test measurements, reference phase noise, integer divider ratios, lock time, and output isolation must be characterized for every required frequency point.
Recommended
Industrial Wireless Sensor Gateway
An industrial wireless gateway can use the SI4113-D-ZT1 to generate RF and IF frequencies for multiple radio paths from a common reference. The 24-pin TSSOP package supports compact board construction, and the device can operate from 2.7 V to 3.6 V, which is compatible with many embedded radio architectures. The synthesizer's integrated VCO and filtering blocks reduce RF component count, but industrial deployments should account for temperature, reference stability, regulatory channel requirements, and the product's NRND status. New industrial platforms should evaluate the recommended SI4113-D-GM before committing the BOM.
Recommended
Recommended Products Summary
Engineering reference data for SI4113-D-ZT1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI4113-D-GM | SI4113-D-GT | SI4113-D-GTR | SI4113-BT | SI4122-D-GTR |
|---|---|---|---|---|---|---|
| Package | TSSOP-24 | TSSOP-24 | TSSOP-24 | TSSOP-24 | TSSOP-24 | TSSOP-24 |
| Brand | Skyworks Solutions, Inc. | Skyworks Solutions, Inc. | Skyworks Solutions, Inc. | Skyworks Solutions, Inc. | Skyworks Solutions, Inc. | Skyworks Solutions, Inc. |
Key Differentiators
- Three integrated synthesis paths cover both RF bands and IF (vs SI4122-D-GTR)
- Manufacturer-recommended migration path (vs SI4113-D-GM)
- Low external-component count for an integrated RF synthesizer (vs SI4113-BT)
- Very low programmable standby current (vs SI4113-D-GT)
Design Notes
Keep the reference input, divider paths, loop-filter components, and RF output routing short to minimize parasitic coupling and phase-noise degradation. Use a continuous ground plane beneath the TSSOP footprint and place the supply bypass capacitor immediately between the supply and ground pins. The integrated architecture needs only two external components according to the manufacturer data, but their placement still determines whether the loop locks cleanly and the RF outputs remain isolated.
Validate lock and phase-noise performance across every required RF1, RF2, and IF frequency rather than testing only one convenient output. The SI4113-D-ZT1 supports RF1 from 900 MHz to 1.8 GHz, RF2 from 750 MHz to 1.5 GHz, and IF from 62.5 MHz to 1 GHz. Review reference spurs, divider-ratio selection, loop-filter bandwidth, and output isolation in the final PCB because the integrated VCO architecture does not eliminate sensitivity to poor reference routing or unintended coupling.
Do not begin a new platform with SI4113-D-ZT1 without confirming supply continuity, because Mouser marks it not recommended for new designs and identifies SI4113-D-GM as the recommended replacement. For an existing design, compare the replacement's package drawing, pin assignment, control-interface timing, register map, divider behavior, and output specification before substituting it. A shared package name alone does not prove that firmware and board-level sequencing are interchangeable.
Design the 2.7 V to 3.6 V supply rail so it remains within the SI4113-D-ZT1 operating range during startup and load transients. The device typically consumes 18 mA while operating but can enter programmable powerdown with 1 µA standby current. Avoid hot-plugging the synthesizer directly from an uncontrolled supply; sequence power and ground to protect the RF circuitry and to prevent unintended reference or RF output activity during initialization.
Compliance Information
The verified Mouser listing identifies the SI4113-D-ZT1 as lead free with NiPd termination. No explicit RoHS, REACH, halogen-free, conflict-minerals, or automotive qualification statement was supplied.
