STMicroelectronics STTH1202D

Overview

STTH1202D from STMicroelectronics is a 200 V, 12 A ultrafast recovery diode in TO-220AC package, featuring 18 ns typical reverse recovery time (trr), 0.82 V typical forward voltage at 150 °C, and 175 °C maximum junction temperature. It is engineered for low-voltage, high-frequency inverters, freewheeling paths, and polarity protection circuits where low conduction and switching losses are critical.

For engineers reviewing the STTH1202D datasheet, STTH1202D pinout, STTH1202D application, or STTH1202D equivalent, key selection criteria include verified trr ≤ 35 ns at 125 °C, thermal resistance Rth(j-c) = 2.5 °C/W, insulation rating of 2500 VRMS, and compatibility with high-dI/dt transient conditions up to –200 A/µs.

Technical Context

The STTH1202D employs ST's planar platinum-doped silicon technology to achieve ultrafast soft recovery with negligible tail current, minimizing EMI and reducing snubber requirements in hard-switched topologies. Its dynamic performance is characterized under controlled dIF/dt (–50 to –200 A/µs) and VR (30–160 V), with trr and IRM tightly specified across Tj = 25–125 °C.

Thermal design is enabled by its low Rth(j-c) of 2.5 °C/W (TO-220AC), supporting 12 A average forward current at case temperature TC = 140 °C. The device operates reliably up to 175 °C junction temperature and maintains stable VF and trr over wide temperature and current ranges, as confirmed in Figures 2, 7, and 9 of the official datasheet.

Key Specifications

Pinout & Package

STTH1202D is housed in a TO-220AC package with electrically insulated mounting tab rated for 2500 VRMS isolation. The package features three terminals: Anode (pin 1), Cathode (pin 2), and electrically isolated metal tab (pin 3, mechanically connected to cathode but insulated from PCB ground).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR1220CT and VS-12EWH02-M3, STTH1202D delivers the lowest combined conduction–switching loss at high temperature and frequency, plus built-in 2500 VRMS isolation-making it optimal for space-constrained, thermally aggressive, and safety-critical freewheeling roles.

Availability

STTH1202D is available at Aetrix Electronics and suitable for motor drive freewheeling, solar microinverter rectification, and automotive polarity protection requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for STTH1202D 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.

The STTH ultrafast diode product line targets high-efficiency power conversion systems demanding minimal recovery loss, robust thermal performance, and reliable operation across extended temperature ranges.

FAQ

What is the maximum allowable case temperature for continuous 12 A operation?

The STTH1202D supports IF(AV) = 12 A only when the case temperature (TC) is maintained at ≤140 °C, as defined in Table 1 of the datasheet. Exceeding this temperature requires linear derating per the derating curve in Figure 1, with zero average current allowed at TC ≥ 175 °C.

Does STTH1202D have a built-in thermal shutdown feature?

No, STTH1202D is a passive discrete diode and does not include thermal shutdown circuitry. Safe operation relies on external thermal management-such as heatsink sizing based on Rth(j-c) = 2.5 °C/W and ambient temperature constraints-to ensure Tj remains ≤175 °C under worst-case load and airflow conditions.

Can STTH1202D be used in place of a Schottky diode in 48 V systems?

Yes, but only where reverse voltage exceeds 48 V × √2 ≈ 68 V and switching frequency is >50 kHz. Unlike Schottkys, STTH1202D has no majority-carrier limitation and blocks 200 V, but its 0.82 V VF is higher than typical Schottky VF (<0.5 V). Use it when higher VRRM and temperature stability outweigh VF penalty.

Is the TO-220AC package of STTH1202D lead-free and RoHS compliant?

Yes, STTH1202D is supplied in ST's ECOPACK®-compliant TO-220AC package, featuring lead-free second-level interconnect and meeting RoHS Directive 2011/65/EU and JEDEC JESD97 standards. The inner box label indicates the lead-free category and maximum soldering profile limits.