STMicroelectronics STTH1210D

Overview

STTH1210D from STMicroelectronics is an ultrafast recovery, high-voltage silicon rectifier diode in TO-220AC package, rated for 1000 V repetitive peak reverse voltage, 12 A average forward current at Tc = 125 °C, and 48 ns typical reverse recovery time at 125 °C with dIF/dt = −200 A/µs. It serves as a primary freewheeling or output rectifier in industrial switch-mode power supplies and motor drive snubber circuits.

For engineers reviewing the STTH1210D datasheet, STTH1210D pinout, STTH1210D application, or STTH1210D equivalent, key selection criteria include soft recovery behavior (S factor = 2), low conduction loss (VF = 1.30 V typ. at 12 A, 150 °C), thermal robustness (Tj max = 175 °C), and junction-to-case thermal resistance of 1.9 °C/W - critical for high-reliability 1–5 kW power conversion designs.

Technical Context

This diode employs optimized epitaxial silicon design to achieve ultrafast, soft reverse recovery-minimizing voltage overshoot and EMI during turn-off in hard-switched topologies. Its dynamic performance is characterized under high dIF/dt (up to −200 A/µs) and elevated junction temperature (125 °C), ensuring stable operation in high-frequency PFC and DC-DC stages.

Thermal management is enabled by direct metal tab mounting and low Rth(j-c) = 1.9 °C/W. The device exhibits low leakage (IR ≤ 30 µA at 125 °C, VR = 1000 V), supporting reliable operation in high-ambient-temperature environments without thermal runaway risk.

Key Specifications

Pinout & Package

STTH1210D uses the TO-220AC package: insulated plastic body with electrically isolated metal tab (no internal insulation layer), 3-pin through-hole configuration, and screw-mountable copper tab for thermal interface. 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 MUR1210CT and VS-12EWH10, STTH1210D delivers optimal balance of soft recovery, TO-220AC compatibility, and cost-effective thermal performance for 1–2.5 kW industrial power stages - making it preferred where EMI control and footprint continuity are design priorities.

Availability

STTH1210D is available at Aetrix Electronics and suitable for industrial switch-mode power supplies, motor drive freewheeling circuits, and snubber network clamps requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for STTH1210D 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.

The STTH ultrafast diode product line targets high-efficiency, high-reliability power conversion systems - specifically engineered for demanding rectification, freewheeling, and snubbing roles in industrial motor drives and telecom/server PSUs.

FAQ

What is the maximum allowable mounting torque for STTH1210D?

The recommended torque value for the mounting screw is 0.55 Nm; the absolute maximum torque is 0.7 Nm. Exceeding this may deform the TO-220AC package, compromise thermal contact, or damage internal wire bonds. Use a calibrated torque screwdriver and verify flatness of the heatsink surface before installation.

Can STTH1210D be used in place of a standard fast recovery diode like BYV26E?

Yes, but with design validation: STTH1210D offers superior softness (S = 2 vs. ~1.2 for BYV26E) and lower VF (1.30 V vs. 1.7 V), reducing both switching noise and conduction loss. However, its higher trr sensitivity to dIF/dt requires verifying layout parasitics and snubber sizing in existing BYV26E designs.

Is STTH1210D RoHS-compliant and lead-free?

Yes - STTH1210D is supplied in ECOPACK®-compliant packaging with lead-free second-level interconnect, meeting RoHS Directive 2011/65/EU and JEDEC JESD97 standards. The inner box label explicitly marks the lead-free status and maximum soldering profile (reflow peak: 260 °C).

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

No - the TO-220AC package has an electrically connected cathode tab; the metal case is internally bonded to Pin 2 (cathode). For isolation, use STTH1210DI (TO-220Ins), which provides 2500 VRMS insulation between tab and leads. Always verify schematic net connectivity before heatsink mounting.