STMicroelectronics STTH20R04FP

Overview

STTH20R04FP from STMicroelectronics is an ultrafast recovery power rectifier in insulated TO-220FPAC package, optimized for clamping in plasma display panel (PDP) energy recovery circuits. It delivers 20 A average forward current, 400 V repetitive peak reverse voltage, 18 ns typical reverse recovery time, and operates up to 175 °C junction temperature.

For engineers reviewing the STTH20R04FP datasheet, STTH20R04FP pinout, STTH20R04FP application, or STTH20R04FP equivalent, key selection criteria include ultrafast trr performance under high dIF/dt, low conduction loss at 20 A, insulated case rating (2000 VRMS), thermal resistance of 5 °C/W (j-c), and suitability for high-reliability PDP clamping and snubber networks.

Technical Context

This rectifier employs a soft-recovery epitaxial structure to minimize EMI during switching transitions while maintaining low VF (1.15 V typ. at 125 °C, 20 A). Its 0.3 softness factor and 8–11 A peak reverse recovery current (IRM) at 125 °C enable controlled turn-off in high-dI/dt clamping paths.

The TO-220FPAC package provides electrical isolation (2000 VRMS) between the cathode tab and mounting surface, enabling direct heatsink attachment without insulating washers. Thermal impedance is characterized for pulsed operation with 5 °C/W junction-to-case resistance at DC-equivalent conditions.

Key Specifications

Pinout & Package

STTH20R04FP uses the TO-220FPAC package: insulated plastic case with metal tab (cathode), three leads (anode, cathode, and isolated tab connection), and 2000 VRMS insulation rating. Mounting torque: 0.55 N·m (recommended), 0.70 N·m (max).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast rectifier applications.

Compared with STTH20L06D and IXYS MUR2040CT, STTH20R04FP uniquely combines 400 V rating, 18 ns trr, and integrated 2000 VRMS isolation-making it optimal for space-constrained, high-reliability PDP clamping where thermal and electrical isolation are co-required.

Availability

STTH20R04FP is available at Aetrix Electronics and suitable for plasma display panel energy recovery, industrial DC link snubbers, high-frequency SMPS output stages, and capacitor-discharge ignition systems requiring stable component supply and certified ECOPACK®2 compliance.

Supply support for STTH20R04FP 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for automotive, industrial, and consumer markets.

STTH20R04FP belongs to ST's high-efficiency rectifier product line, engineered specifically for ultrafast clamping and energy recovery in plasma display and high-dI/dt power conversion systems.

FAQ

What is the maximum recommended mounting torque for STTH20R04FP?

The recommended torque value for STTH20R04FP's mounting screw is 0.55 N·m, with a maximum allowable torque of 0.70 N·m. Exceeding this limit risks cracking the TO-220FPAC package body or compromising internal wire bonds. Torque must be applied using a calibrated tool on the insulated tab, and thermal interface material should be applied uniformly beneath the tab surface.

Does STTH20R04FP require external insulation when mounted to a heatsink?

No-STTH20R04FP's TO-220FPAC package integrates 2000 VRMS insulation between the cathode tab and mounting surface, eliminating the need for mica or silicone washers. This allows direct metal-to-metal contact with grounded or floating heatsinks. However, mechanical cleanliness and uniform pressure distribution remain critical to maintain both thermal performance and dielectric integrity.

How does softness factor affect EMI in clamping applications?

A softness factor of 0.3 means STTH20R04FP exhibits gradual reverse current decay rather than abrupt turn-off, reducing high-frequency spectral content in voltage transients. In PDP clamping circuits, this lowers radiated emissions by limiting di/dt-induced ringing on PCB traces and minimizing coupling into adjacent signal lines-verified via conducted EMI testing per CISPR 22 Class B.

Can STTH20R04FP replace STTH20R04D in existing designs?

STTH20R04FP and STTH20R04D share identical electrical specs but differ in package: FPAC offers insulation, while D uses non-insulated TO-220AC. Direct replacement is possible only if the original design accommodates the FPAC's taller profile (30.6 mm vs. 14 mm) and revised lead spacing. Electrical substitution requires verifying heatsink grounding strategy and thermal derating due to higher Rth(j-c) (5 vs. 2.8 °C/W).