STMicroelectronics STTH1512D

Overview

STTH1512D from STMicroelectronics is a 1200 V, 15 A ultrafast recovery diode in TO-220AC package, featuring soft reverse recovery (trr = 53 ns typ. at 125 °C), low forward voltage (VF = 1.20 V typ. at 150 °C), and high junction temperature rating (Tj = 175 °C). It serves as a primary rectifier or freewheeling diode in industrial switch-mode power supplies and motor drive snubber circuits.

For engineers reviewing the STTH1512D datasheet, STTH1512D pinout, STTH1512D application, or STTH1512D equivalent, this device is selected for high-voltage DC-link rectification where low conduction loss, controlled EMI via soft recovery, and thermal robustness under pulsed current stress are critical design requirements.

Technical Context

This diode employs a platinum-doped silicon epitaxial structure optimized for ultrafast carrier lifetime control, enabling consistent trr < 75 ns across temperature and dIF/dt up to 200 A/µs. Its softness factor (S = 1.5 typ.) minimizes voltage overshoot during turn-off in inductive switching.

Thermal performance is defined by Rth(j-c) = 1.3 °C/W (TO-220AC), supporting 15 A average forward current at Tc = 130 °C. Reverse leakage remains ≤100 µA at 125 °C and VR = 1200 V, ensuring stable blocking in high-temperature environments.

Key Specifications

Pinout & Package

TO-220AC package: insulated case (no internal metal tab connection), single anode–cathode configuration, mounting hole centered on tab, recommended torque 0.4–0.6 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR1512CT and VS-15EWH12, STTH1512D delivers superior thermal performance (1.3 °C/W), lowest VF at elevated temperature, and proven soft-recovery behavior in high-dI/dt motor drive freewheeling-making it optimal for thermally demanding, reliability-critical industrial rectification.

Availability

STTH1512D is available at Aetrix Electronics and suitable for industrial power supplies, motor control inverters, and renewable energy converters requiring stable component supply and long-term lifecycle support.

Supply support for STTH1512D 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.

STTH1512D belongs to ST's STTH ultrafast diode product line, engineered specifically for high-voltage, high-frequency rectification and freewheeling in mission-critical industrial power conversion systems.

FAQ

What is the maximum allowable case temperature for continuous 15 A operation?

The STTH1512D supports IF(AV) = 15 A continuously when the case temperature (Tc) is held at or below 130 °C, as specified in Table 2. Exceeding this requires derating per the thermal resistance Rth(j-c) = 1.3 °C/W and maximum Tj = 175 °C limit.

Does the TO-220AC package provide electrical isolation between the case and leads?

Yes-the TO-220AC variant used in STTH1512D features an electrically insulated case rated for 2500 V rms isolation and 12 pF junction-to-case capacitance, enabling direct heatsink mounting without additional insulation hardware.

How does soft recovery reduce EMI in motor drive applications?

With a softness factor (S) of 1.5, the STTH1512D exhibits gradual minority-carrier sweep-out during turn-off, limiting di/dt-induced voltage spikes and high-frequency ringing-reducing conducted EMI by up to 15 dB compared to standard fast diodes in identical IGBT freewheeling circuits.

Can STTH1512D replace STTH1512PI in a TO-220AC footprint?

No-STTH1512PI uses the DOP3I insulated package (Rth(j-c) = 2.0 °C/W, different lead spacing and mounting torque), while STTH1512D is TO-220AC (Rth(j-c) = 1.3 °C/W, standard 2.54 mm lead pitch). Mechanical and thermal characteristics are not interchangeable without board redesign.