STMicroelectronics STTH3010D

Overview

STTH3010D from STMicroelectronics is an ultrafast recovery, high-voltage silicon rectifier diode in TO-220AC package, rated for 1000 V repetitive peak reverse voltage, 30 A average forward current at Tc = 105 °C, and 42 ns typical reverse recovery time (trr) at IF = 1 A, dIF/dt = −200 A/µs, VR = 30 V, Tj = 25 °C. It delivers low conduction loss (VF typ. 1.30 V at Tj = 150 °C, IF = 30 A) and soft recovery behavior (S factor = 1), making it suitable for high-frequency snubber circuits and freewheeling paths in industrial switch-mode power supplies.

For engineers reviewing the STTH3010D datasheet, STTH3010D pinout, STTH3010D application, or STTH3010D equivalent, key selection criteria include verified ultrafast trr ≤ 55 ns under high dIF/dt conditions, junction-to-case thermal resistance of 1.1 °C/W, insulated package rating (2500 VRMS), and compatibility with high-pulsed-current operation up to 300 A (IFRM).

Technical Context

This diode employs a platinum-doped lifetime-controlled silicon structure enabling controlled carrier recombination for soft, low-noise reverse recovery-critical in EMI-sensitive high-frequency converters. Its design targets minimal reverse recovery charge (Qrr typ. ~3.5 µC at IF = IF(AV), VR = 600 V, Tj = 125 °C) and stable IR leakage (<100 µA at Tj = 125 °C, VR = VRRM).

The TO-220AC package provides direct metal-to-heatsink thermal conduction and mechanical robustness for industrial environments. Electrical insulation (2500 VRMS, 12 pF capacitance) enables safe use in isolated secondary-side rectification without additional barrier layers.

Key Specifications

Pinout & Package

STTH3010D uses the TO-220AC package: single-ended, through-hole, insulated case (electrically isolated tab), 3-pin outline with center tab as cathode connection. Mounting torque: 0.55 Nm recommended, max 0.7 Nm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3010D, STTH3012D offers higher voltage headroom but slightly higher VF and trr, while MUR3010CT trades insulation and single-diode simplicity for dual-channel integration and lower VF-neither is pin-compatible or electrically drop-in due to structural and isolation differences.

Availability

STTH3010D is available at Aetrix Electronics and suitable for industrial power supplies, motor control inverters, and high-reliability snubber networks requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for STTH3010D 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 industrial, automotive, and consumer markets.

STTH3010D belongs to ST's high-voltage ultrafast diode product line, engineered specifically for high-efficiency, high-frequency industrial power conversion where low Qrr, soft recovery, and thermal ruggedness are critical.

FAQ

What is the maximum allowable heatsink temperature for continuous 30 A operation?

With Rth(j-c) = 1.1 °C/W and Tj(max) = 175 °C, the maximum heatsink temperature is 142 °C assuming 33 °C junction-to-case rise at 30 A. Derating is required above 105 °C case temperature per datasheet IF(AV) curve; actual limit depends on ambient airflow and thermal interface quality.

Can STTH3010D be used in parallel configurations?

Yes-its low and tightly controlled IR leakage (<100 µA at 125 °C) and matched VF characteristics enable stable current sharing. Use matched diodes, symmetrical PCB layout, and individual series inductors (10–100 nH) to balance dynamic current distribution during transients.

Does the insulated TO-220AC package require thermal grease?

Yes-despite electrical isolation, the DOP3I-style epoxy coating does not eliminate thermal interface resistance. ST recommends thermally conductive, electrically insulating grease (e.g., Dow Corning TC-5121) applied uniformly to ensure Rth(j-hs) remains ≤1.5 °C/W under mechanical mounting pressure.

How does soft recovery (S factor = 1) improve system reliability?

A soft recovery waveform avoids abrupt current zero-crossing, eliminating high-frequency ringing and voltage overshoot that stress adjacent MOSFETs and capacitors. This directly reduces EMI filter size, lowers failure rate in 10+ year industrial deployments, and avoids false triggering of overvoltage protection circuits.