STMicroelectronics STUW81300TR

Overview

STUW81300TR from STMicroelectronics is a wideband RF/microwave fractional/integer-N PLL frequency synthesizer with integrated VCOs, LDOs, and differential reference input. It delivers two RF outputs (1.925–8.0 GHz and 7.7–16.0 GHz), achieves -131 dBc/Hz phase noise @1 MHz offset at 6 GHz, supports up to 100 MHz PFD frequency, and operates from 3.0–5.4 V supply in a VFQFPN36 package - used in satellite communications transceivers and 5G infrastructure local oscillators.

For engineers reviewing the STUW81300TR datasheet, STUW81300TR pinout, STUW81300TR application, or STUW81300TR equivalent, this page provides verified technical context, validated pin functions, real-world use scenarios, confirmed alternatives, and supply-ready availability details - all grounded in DS11314 Rev 7 production data.

Technical Context

The STUW81300TR integrates dual-architecture PLL (Fractional-N and Integer-N) with four auto-calibrating VCOs covering 1.925–16 GHz across two output paths: RF1 (VCO/VCO÷2) and RF2 (VCO×2). Its internal LDOs regulate 4.5 V, VCO-core, reference, digital, and RF supplies independently, enabling stable operation over -40°C to +85°C ambient.

It features differential LVDS/LVPECL-compliant reference input (up to 800 MHz), SPI-based register programming, fast-lock mode, cycle-slip reduction, and robust VCO calibration that maintains center frequency within ±75–110°C temperature variation depending on VCO band and supply voltage - critical for phase-coherent multi-band systems.

Key Specifications

Pinout & Package

STUW81300TR is housed in a 36-pin VFQFPN (Very Thin Quad Flat No-lead) package measuring 6 mm × 6 mm × 1.0 mm with 0.5 mm pitch and an exposed thermal pad. This RoHS-compliant package supports reflow soldering and provides low-inductance grounding for RF performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wideband PLL synthesizer applications.

Compared with HMC703LP4E and LMS8001, the STUW81300TR uniquely combines dual-band RF outputs (1.9–16 GHz), on-chip LDOs, and auto-calibrating VCOs - making it the only solution that satisfies both mmWave LO and thermal-stable operation in compact infrastructure hardware.

Availability

STUW81300TR is available at Aetrix Electronics and suitable for 5G radio units, satellite modems, phased array radar systems, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STUW81300TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in analog, power, and RF technologies for industrial, automotive, and communications markets.

The STuW81300 belongs to ST's high-frequency RF synthesizer product line, designed specifically for infrastructure-grade wireless systems demanding wideband agility, ultra-low phase noise, and high integration density in compact form factors.

FAQ

What reference clock formats does STUW81300TR support?

The STUW81300TR accepts differential LVDS or LVPECL reference inputs (REF_CLKP/REF_CLKN) up to 800 MHz, single-ended CMOS inputs (with external termination), and crystal oscillator mode (10–50 MHz). All modes are selectable via SPI register configuration, and the internal reference buffer achieves -163 dBc/Hz phase noise floor at 100 MHz in single-ended mode.

How does the VCO auto-calibration function across temperature?

VCO calibration uses an internal frequency discriminator and digital state machine to adjust VCO bias and band selection in real time. At 3.3 V VCC_VCO_Core, ΔTLOCK is ±75–110°C depending on VCO band and junction temperature; at 4.5 V, it improves to ±75–110°C with tighter variation - ensuring center frequency stability without external compensation circuitry.

Can STUW81300TR operate without external VCOs?

Yes - the STUW81300TR integrates four fully functional VCOs covering 1.925–16 GHz and requires no external VCO. The EXTVCO_INP/EXTVCO_INN pins are optional and must be grounded if unused. External VCO mode is provided only for specialized applications needing custom resonator topologies or extended frequency range beyond on-chip capability.

What is the maximum output power and impedance matching status of RF1 and RF2?

RF1 delivers +6 dBm at 6 GHz and RF2 delivers +4 dBm at 12 GHz, both single-ended. Each differential output pair (RF1_OUTP/N, RF2_OUTP/N) is internally broadband-matched to 50 Ω, eliminating need for external baluns or matching networks - verified per DS11314 Rev 7 Figure 11 and Figure 12 across temperature and frequency.