STMicroelectronics LET20030C

Overview

LET20030C from STMicroelectronics is a common-source N-channel enhancement-mode lateral MOSFET RF power transistor designed for broadband base station amplifiers up to 2 GHz. It delivers 45 W output power at 28 V and 13.9 dB gain at 2000 MHz, with thermal resistance of 1.2 °C/W and maximum junction temperature of 200 °C.

For engineers reviewing the LET20030C datasheet, LET20030C pinout, LET20030C application, or LET20030C equivalent, key selection criteria include RF output power at 2–2.2 GHz, drain efficiency under IS-95 modulation, load mismatch tolerance (10:1 VSWR), and BeO-free M243 hermetic package compliance with RoHS and ECOPACK® requirements.

Technical Context

This device operates in common-source configuration with fixed gate bias (VGS(Q) = 2.0–5.0 V) and supports broadband linear amplification across 1.8–2.2 GHz. Its lateral MOSFET architecture enables high thermal stability and robustness against load mismatch, critical for cellular infrastructure PA stages.

Designed for Class AB operation at IDQ = 400 mA, it achieves 45–53 W POUT depending on supply voltage (28 V or 36 V), with IMD3 < –60 dBc and ACPR < –70 dBc under IS-95 9-channel forward modulation at 2000 MHz.

Key Specifications

Pinout & Package

The LET20030C uses the M243 (.230 × .360 inch, 2-lead, non-hermetic with flange) package - a BeO-free, epoxy-sealed ceramic-metal hybrid suitable for high-power RF applications requiring low thermal resistance and RoHS compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF power transistor applications.

Compared with MRF6P21190HR5 and PD85003S, LET20030C offers optimal balance of 45 W output, 1.2 °C/W thermal resistance, and 80 V breakdown in the compact M243 package-making it ideal for mid-tier base station PA modules where cost, size, and linearity must coexist.

Availability

LET20030C is available at Aetrix Electronics and suitable for macrocell base station PA, CDMA2000 repeater amplifiers, and LTE Band 41 small cell deployments requiring stable component supply and long-term lifecycle support.

Supply support for LET20030C 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 power management, analog, MEMS, and RF solutions for industrial, automotive, and communications markets.

The LET20030C belongs to ST's LdmoST family of lateral MOSFETs-designed specifically for high-efficiency, high-linearity RF power amplification in commercial wireless infrastructure up to 2.2 GHz.

FAQ

What is the recommended gate bias voltage range for linear operation?

The LET20030C specifies VGS(Q) = 2.0–5.0 V at ID = 300 mA and VDS = 28 V. For Class AB linear operation at IDQ = 400 mA, ST recommends 3.2–3.8 V gate bias with temperature-compensated bias network to maintain stable quiescent current across –40°C to +85°C ambient.

Can LET20030C be used in pulsed RF applications?

Yes-the device supports pulsed operation with duty cycle ≤10% and pulse width ≤100 µs. Under these conditions, peak drain current may reach 9 A, and thermal limits relax to allow short-term PDISS up to 140 W, provided average power remains within 108 W and case temperature stays below 70°C.

Is external gate protection required?

Yes-although the LET20030C has built-in gate protection diodes, ST recommends adding a 10 Ω series gate resistor and 100 pF RF bypass capacitor to ground at the gate pad to suppress VHF/UHF oscillations and limit ESD-induced gate oxide stress during board handling and hot insertion.

What is the typical input impedance at 2000 MHz?

Per Figure 2 in the datasheet, ZIN at 2000 MHz is approximately 2.5 + j1.8 Ω. This low real part necessitates broadband matching using high-Q lumped LC networks or microstrip stubs; ST provides reference matching circuits in AN4122 for 28 V operation with 50 Ω system interface.