STMicroelectronics STTH802CB-TR

Overview

STTH802CB-TR from STMicroelectronics is a dual-center-tap ultrafast recovery silicon rectifier diode in DPAK package, rated for 200 V repetitive peak reverse voltage, 4 A average forward current per diode (8 A per device), 13 ns typical reverse recovery time, and 175 °C maximum junction temperature - deployed in low-voltage, high-frequency DC–DC converters and SMPS freewheeling paths.

For engineers reviewing the STTH802CB-TR datasheet, STTH802CB-TR pinout, STTH802CB-TR application, or STTH802CB-TR equivalent, key selection criteria include reverse recovery time under 20 ns, thermal resistance ≤4 °C/W per diode, dual-diode center-tap configuration, and DPAK thermal pad compatibility with PCB copper area ≥5 cm².

Technical Context

This dual-diode device integrates two independent ultrafast switching diodes sharing a common cathode terminal (center-tap configuration), enabling synchronous rectification or complementary freewheeling in half-bridge and push-pull topologies. Its 13 ns trr (typ.) and 0.81 V VF (typ. at 125 °C, 4 A) support high-efficiency operation above 100 kHz.

Thermal design relies on conduction cooling via the exposed thermal pad: Rth(j–c) = 4 °C/W per diode (max), with total device Rth(j–c) = 2.5 °C/W. Junction-to-ambient resistance drops to ~35 °C/W with 5 cm² 2-oz copper under the tab.

Key Specifications

Pinout & Package

DPAK (TO-252AA) package with exposed thermal pad on underside; 3-terminal configuration: Pin 1 (Anode 1), Pin 2 (Cathode / Center Tap), Pin 3 (Anode 2). Mounting requires solder paste stencil opening matching 4.95–5.46 mm × 6.35–6.73 mm footprint and thermal via array beneath pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH802CB-TR, STTH802CW-TR offers superior thermal dissipation in compact layouts, while IXYS MUR820CT trades speed for mechanical robustness and legacy compatibility - making the STTH802CB-TR optimal for high-frequency, space-constrained SMPS requiring sub-20 ns recovery.

Availability

STTH802CB-TR is available at Aetrix Electronics and suitable for server VRMs, industrial DC–DC converters, solar microinverters, and automotive on-board chargers requiring stable component supply with consistent DPAK thermal performance and ultrafast recovery behavior.

Supply support for STTH802CB-TR 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The STTH series targets high-efficiency power conversion, with STTH802CB-TR specifically engineered for ultrafast, thermally efficient dual-diode rectification in high-frequency switched-mode power supplies.

FAQ

What is the pin configuration and thermal pad connection requirement for STTH802CB-TR?

STTH802CB-TR uses a 3-pin DPAK package: Pin 1 = Anode 1, Pin 2 = Common Cathode (center tap), Pin 3 = Anode 2. The exposed thermal pad (underside) must be soldered to ≥3 cm² of 2-oz copper with ≥6 thermal vias (0.3 mm diameter, 0.8 mm pitch) to achieve Rth(j–c) ≤4 °C/W per diode.

How does STTH802CB-TR perform under high-temperature operating conditions?

At 125 °C junction temperature, VF remains 0.81 V (typ.) at 4 A, and trr increases only to 18 ns (max). With Rth(j–c) = 4 °C/W per diode, sustained 4 A operation requires case temperature ≤125 °C - achievable using ≥5 cm² copper pour and forced airflow ≥1 m/s.

Can STTH802CB-TR replace standard FRDs in existing 100 kHz flyback designs?

Yes - its 13 ns trr and 0.81 V VF reduce total losses by 18–22% versus typical FRDs (e.g., 1N5408 or BYV26E) at 100 kHz. No layout change is needed beyond verifying DPAK footprint and thermal pad soldering; no gate drive or control loop adjustment required.

Is STTH802CB-TR suitable for bidirectional power flow applications?

No - it is a unidirectional rectifier. While the dual-center-tap structure supports symmetrical forward conduction, it lacks reverse conduction capability or controlled turn-off. For bidirectional operation, discrete SiC MOSFETs or actively commutated IGBT modules are required.