STMicroelectronics STTH1302CT

Overview

STTH1302CT from STMicroelectronics is a dual center-tap ultrafast silicon rectifier diode in D²PAK package, rated for 200 V repetitive peak reverse voltage, 2 × 6.5 A average forward current per diode, and 16 ns typical reverse recovery time. It is designed for low-voltage, high-frequency switch-mode power supplies, freewheeling, and polarity protection circuits where low conduction and switching losses are critical.

For engineers reviewing the STTH1302CT datasheet, STTH1302CT pinout, STTH1302CT application, or STTH1302CT equivalent, key selection criteria include its dual-diode center-tap configuration, 175 °C maximum junction temperature, 0.81 V typical forward voltage at 125 °C/6.5 A, 70 A non-repetitive surge capability, and thermal resistance of 1.9 °C/W (junction-to-case, total).

Technical Context

This device integrates two independent ultrafast epitaxial planar diodes in a single D²PAK thermally optimized package with center-tap anode configuration. Its 16 ns typical trr and low Qrr support high-frequency DC–DC conversion up to several hundred kHz while minimizing switching losses.

The dual-diode structure enables symmetrical current sharing in center-tapped transformer topologies; thermal coupling between diodes is modeled via Rth(c) = 0.8 °C/W, requiring derating when both diodes conduct simultaneously under high RMS load conditions.

Key Specifications

Pinout & Package

D²PAK (TO-263-3L) package with exposed metal tab for thermal conduction; 3-terminal configuration: Anode 1 (A1), Cathode (K), Anode 2 (A2). The center-tap arrangement places K between A1 and A2 on the die, enabling direct connection to transformer center tap.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast dual-center-tap rectifier applications.

Compared with STTH1202CT and MBR20200CT, STTH1302CT uniquely balances 200 V blocking, 16 ns trr, and 175 °C operation-making it optimal for high-efficiency, high-temperature SMPS where precise recovery control and thermal resilience are mandatory.

Availability

STTH1302CT is available at Aetrix Electronics and suitable for server power supplies, telecom rectifiers, industrial motor drives, and LED driver power stages requiring stable component supply and long-term industrial lifecycle support.

Supply support for STTH1302CT 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, specializing in power management, analog, microcontrollers, and automotive ICs with vertical manufacturing capabilities.

The STTH ultrafast diode product line targets high-frequency power conversion systems, emphasizing low-loss rectification, thermal robustness, and compliance with industrial and telecom environmental standards.

FAQ

What is the correct mounting orientation for thermal performance?

The D²PAK metal tab must be soldered directly to a ≥1 cm² copper thermal pad on the PCB, with no insulating layer. Mounting with thermal interface material or standoff spacers increases Rth(j-a) by >30 °C/W and risks exceeding 175 °C junction temperature at rated current.

Can STTH1302CT replace standard FR-type diodes in existing designs?

Yes, but only if the original design uses a center-tap dual-diode configuration and operates below 200 V reverse voltage. Its 16 ns trr and 0.81 V VF reduce switching and conduction losses significantly-but layout must accommodate D²PAK footprint and thermal pad requirements.

Is paralleling two STTH1302CT units recommended for higher current?

No-each STTH1302CT already integrates two matched diodes with shared thermal path. Paralleling units introduces imbalance due to parametric spread and unequal thermal coupling; instead, use STTH1602CT (2 × 8 A) or discrete D²PAK diodes with external current-sharing resistors.

Does STTH1302CT require snubber circuits in 300 kHz operation?

Not typically-its 16 ns trr and low Qrr (measured <20 nC at 125 °C) suppress voltage overshoot sufficiently in well-layout 300 kHz flyback or forward converters. Snubbers may still be needed only if parasitic inductance exceeds 20 nH in the high-di/dt loop.