STMicroelectronics STTH1502D

Overview

STTH1502D from STMicroelectronics is an ultrafast recovery silicon diode in TO-220AC package, rated for 15 A average forward current, 200 V repetitive peak reverse voltage, and 20 ns typical reverse recovery time at 1 A/–50 A/µs. It employs platinum-doped planar technology to minimize conduction and switching losses, and is designed for base drive and transistor switching circuits in low-voltage, high-frequency inverters and freewheeling paths.

For engineers reviewing the STTH1502D datasheet, STTH1502D pinout, STTH1502D application, or STTH1502D equivalent, key selection criteria include junction-to-case thermal resistance (2.5 °C/W), insulated package options (TO-220AC Ins, TO-220FPAC), and dynamic performance under high dIF/dt conditions (up to –200 A/µs at 125 °C).

Technical Context

This diode leverages ST's platinum-doped planar junction process to achieve low VF (0.85 V typ. at 15 A, 150 °C) and fast trr (20–25 ns typ. at IF = 1 A, dIF/dt = –100 A/µs, VR = 30 V). Its design targets minimal stored charge (QRR ≈ 25–40 nC) and negligible tail current, enabling efficient operation in hard-switched SMPS and motor drive snubbers.

The device supports high junction temperature operation (Tj(max) = 175 °C) and features robust surge capability (150 A non-repetitive, 10 ms sine half-wave). Thermal performance is optimized for conduction-cooled mounting with specified torque (0.8 Nm recommended) and UL94 V0 epoxy encapsulation.

Key Specifications

Pinout & Package

STTH1502D is housed in a TO-220AC package: three-terminal, through-hole, non-insulated plastic case with metal tab (cathode-connected). Mounting requires mechanical isolation if circuit ground is not tied to cathode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1502D, STTH1502DI provides certified isolation at the cost of thermal performance, while STTH1502FP trades thermal efficiency for mechanical versatility - both retain identical electrical characteristics and switching behavior.

Availability

STTH1502D is available at Aetrix Electronics and suitable for high-frequency inverters, motor drive freewheeling, and polarity protection circuits requiring stable component supply and long-term industrial lifecycle support.

Supply support for STTH1502D 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.

STTH1502D belongs to ST's Ultrafast Recovery Diode product line, engineered specifically for high-efficiency, high-frequency power conversion where low QRR, fast trr, and rugged thermal performance are critical.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STTH1502D supports continuous operation with case temperature up to 130 °C when delivering its rated 15 A average forward current. This limit is defined in Table 1 under IF(AV) for TO-220AC, and assumes proper heatsinking with recommended mounting torque of 0.8 Nm.

Does STTH1502D require a heatsink in 15 A applications?

Yes - at 15 A average current and 0.85 V forward drop, power dissipation exceeds 12 W. With Rth(j-c) = 2.5 °C/W, junction temperature would exceed 175 °C without external heatsinking; a minimum 10 °C/W heatsink is recommended for ambient ≤50 °C.

How does trr vary with temperature and dIF/dt?

trr decreases with rising junction temperature and increases with higher dIF/dt. At Tj = 125 °C and dIF/dt = –200 A/µs, trr is ~25 ns (vs. 20 ns at 25 °C/–100 A/µs), per Figure 8. This inverse temperature dependence improves high-temperature switching stability.

Can STTH1502D replace a standard FRD like BYV26E?

Yes - STTH1502D offers lower VF (0.85 V vs. 1.15 V), faster trr (20 ns vs. 50 ns), and higher Tj (175 °C vs. 150 °C) than BYV26E. However, its 200 V VRRM is lower than BYV26E's 600 V, so replacement is valid only in ≤200 V circuits with verified voltage margin.