STMicroelectronics STTH16R04CT

Overview

STTH16R04CT from STMicroelectronics is a dual ultrafast recovery diode in TO-220AB package, rated for 400 V repetitive peak reverse voltage and 16 A average forward current (per device), with typical reverse recovery time of 25 ns and forward voltage drop of 0.9 V at 8 A and 25 °C. It is engineered for high-frequency switching mode power supplies, freewheeling paths in DC-DC converters, and polarity protection circuits operating up to 175 °C junction temperature.

For engineers reviewing the STTH16R04CT datasheet, STTH16R04CT pinout, STTH16R04CT application, or STTH16R04CT equivalent, key selection criteria include its 25 ns trr at 1 A/30 V, 1.15 °C/W junction-to-case thermal resistance (per device), dual-diode configuration, ECOPACK®2 compliance, and suitability for low-voltage, high-pulse-current operation in industrial inverters and motor drives.

Technical Context

This dual common-cathode ultrafast diode uses platinum-doped planar silicon technology to achieve soft recovery characteristics (Sfactor ≥ 0.4) and low conduction losses-calculated via P = 0.83 × IF(AV) + 0.034 × IF²(RMS). Its 400 V VRRM rating supports use in 300–350 V bus systems with margin.

The device features two independent diodes sharing one cathode terminal, enabling synchronous rectification or dual-path freewheeling. Thermal coupling between diodes is quantified by Rth(c) = 0.3 °C/W, allowing accurate junction temperature estimation when both diodes conduct simultaneously.

Key Specifications

Pinout & Package

STTH16R04CT is housed in a TO-220AB through-hole package with isolated tab (electrically connected to cathode), standardized mechanical footprint, and recommended mounting torque of 0.55 N·m. The package provides robust thermal conduction and meets UL 94 V0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast dual-diode applications.

Compared with STTH16R04CG and MUR1640CT, STTH16R04CT delivers superior thermal resistance (1.15 vs. 2.0 or 2.5 °C/W), lower VF at high temperature, and electrically isolated tab-critical for grounded-cathode topologies requiring creepage clearance.

Availability

STTH16R04CT is available at Aetrix Electronics and suitable for industrial motor drives, server power supplies, solar microinverters, and automotive DC-DC converters requiring stable component supply across multi-year production cycles.

Supply support for STTH16R04CT 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.

STTH16R04CT belongs to ST's ultrafast recovery diode product line, developed specifically for high-efficiency, high-frequency switching power conversion where low trr, soft recovery, and high-temperature reliability are mandatory.

FAQ

What is the maximum allowable case temperature for continuous operation?

The maximum case temperature is not directly specified, but thermal design must ensure junction temperature does not exceed 175 °C. With Rth(j-c) = 1.15 °C/W per device and 16 A IF(AV), sustained power dissipation above ~17 W requires active heatsinking or airflow to maintain safe Tj. Derating curves in Figure 1 confirm 16 A is valid only when TC ≤ 145 °C.

Is the TO-220AB tab electrically isolated from the leads?

Yes-the TO-220AB package used for STTH16R04CT features an electrically isolated tab internally connected to the common cathode (Pin 3). This isolation enables mounting to grounded heatsinks without shorting the cathode node, unlike TO-220AC variants where the tab is tied to the cathode terminal.

Can STTH16R04CT replace a single 8 A ultrafast diode in a design?

No-it is a dual-diode device with two anodes and one shared cathode. Using only one anode ignores half the device and wastes thermal capacity. It is intended for dual-path applications like half-bridge freewheeling or dual-output converters, not as a drop-in replacement for single-diode footprints.

How does softness factor (Sfactor) affect EMI in converter designs?

An Sfactor ≥ 0.4 indicates controlled, non-abrupt current decay during reverse recovery, reducing di/dt-induced voltage spikes and high-frequency ringing on switching nodes. This directly lowers conducted EMI in the 30–100 MHz band and eases compliance with CISPR-22 Class B limits without added snubbers.