STMicroelectronics STTH3002CT

Overview

STTH3002CT from STMicroelectronics is a dual ultrafast recovery rectifier diode in TO-220AB package, rated for 2 × 15 A average forward current per diode, 200 V repetitive peak reverse voltage, and 17 ns typical reverse recovery time at 25 °C. It serves as a high-efficiency freewheeling and polarity protection device in low-voltage, high-frequency DC–DC converters and SMPS secondary-side rectification.

For engineers reviewing the STTH3002CT datasheet, STTH3002CT pinout, STTH3002CT application, or STTH3002CT equivalent, key selection criteria include its dual-diode thermal coupling behavior, junction-to-case thermal resistance of 1.5 °C/W per diode, insulated mounting capability (when used with insulating washer), and validated performance under 125 °C junction temperature with 6 A peak reverse recovery current.

Technical Context

This dual-center-tab rectifier integrates two independent ultrafast switching diodes sharing a common cathode connection (K–K) and separate anodes (A1, A2), enabling synchronous or interleaved operation in bridge and center-tap topologies. Its 17 ns typical trr and 0.75 V typical VF at 15 A/150 °C support high-frequency switching up to 500 kHz while minimizing conduction and recovery losses.

Thermal design relies on case-conduction cooling: each diode exhibits 1.5 °C/W junction-to-case resistance, and total device dissipation is limited by coupled thermal path (Rth(j-c) = 1.0 °C/W overall). The TO-220AB package supports 0.4–0.6 N·m mounting torque and UL94 V0 epoxy encapsulation.

Key Specifications

Pinout & Package

STTH3002CT uses a TO-220AB package with three leads: two anodes (A1, A2) and one shared cathode (K). The metal tab is electrically connected to the cathode and must be isolated from chassis ground when used in floating configurations. Mounting torque: 0.4–0.6 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH30L06CT and VS-30CTH02-M3, STTH3002CT delivers the lowest trr (17 ns) and VF (0.75 V) at 150 °C among TO-220 dual rectifiers rated ≤200 V, making it optimal for high-efficiency, high-frequency SMPS where thermal and switching loss budgets are tight.

Availability

STTH3002CT is available at Aetrix Electronics and suitable for server power supplies, industrial DC–DC converters, solar microinverters, and automotive on-board charger auxiliary supplies requiring stable component supply across multi-year production cycles.

Supply support for STTH3002CT 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 switch-mode power conversion, emphasizing low trr, low VF, and robust surge capability for next-generation power supplies operating above 100 kHz.

FAQ

What is the electrical relationship between A1 and A2 pins?

A1 and A2 are fully independent anodes connected internally to separate P–N junctions, sharing only the common cathode (K) terminal. No internal connection exists between A1 and A2; they may be driven from different transformer windings or switch nodes without cross-conduction risk.

Can STTH3002CT be used with an insulating washer on the TO-220AB tab?

Yes - the metal tab is electrically tied to the K (cathode) terminal, so an insulating washer (e.g., mica or silicone pad) isolates the cathode from the heatsink. This is required in floating-output or high-side referenced circuits; torque must remain within 0.4–0.6 N·m to maintain thermal contact.

How does junction temperature affect reverse recovery time?

trr increases with junction temperature: at 125 °C, typical trr rises to 22 ns (vs. 17 ns at 25 °C) under identical test conditions (IF = 1 A, dIF/dt = 200 A/µs, VR = 30 V). This is confirmed in Figure 9 of the datasheet and must be factored into EMI filter design at elevated ambient temperatures.

Is STTH3002CT suitable for synchronous rectification replacement?

No - STTH3002CT is a passive silicon PN junction diode, not a MOSFET-based synchronous rectifier. It lacks gate control and cannot be actively turned off. It serves as a freewheeling or rectifying element in non-synchronous topologies like flyback, forward, or half-wave bridge where simplicity and ruggedness outweigh efficiency gains from synchronous control.