STMicroelectronics STPS30SM80CT

Overview

STPS30SM80CT from STMicroelectronics is a dual common-cathode Schottky rectifier in insulated TO-220FPAB package, rated for 80 V repetitive peak reverse voltage and 2 × 15 A average forward current per diode at TC = 105 °C. It delivers typ. 515 mV forward voltage at 15 A/125 °C and supports junction temperatures up to 175 °C, enabling high-efficiency operation in AC-DC adapters for LCD TVs and gaming consoles.

For engineers reviewing the STPS30SM80CT datasheet, STPS30SM80CT pinout, STPS30SM80CT application, or STPS30SM80CT equivalent, key selection criteria include its low VF/IR trade-off, avalanche-rated 100 V capability, insulated 2000 VRMS package, thermal resistance of 5.30 °C/W (j–c) per diode, and suitability for high-frequency SMPS with simultaneous dual-diode conduction.

Technical Context

This device integrates two independent Schottky diodes sharing a common cathode terminal, optimized for synchronous rectification and output stage freewheeling in isolated DC–DC converters. Its low forward voltage drop reduces conduction losses, while controlled leakage (<20 mA at 125 °C, VRRM) maintains efficiency under thermal stress.

The TO-220FPAB package provides electrical insulation (2000 VRMS) and direct case-to-heatsink thermal coupling. Thermal design must account for coupling resistance (3.10 °C/W) when both diodes operate concurrently-junction temperature rise depends on power distribution across both dies.

Key Specifications

Pinout & Package

Package: TO-220FPAB - Insulated plastic housing with metal tab (electrically isolated), 2000 VRMS isolation, screw-mount compatible (0.55 N·m recommended torque).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS30H80CT and VB230SP-E3/45, STPS30SM80CT uniquely combines 2000 VRMS insulation, 100 V avalanche rating, and best-in-class VF (515 mV) at 125 °C-making it optimal for cost-sensitive, safety-critical consumer adapters where thermal headroom and transient robustness are jointly constrained.

Availability

STPS30SM80CT is available at Aetrix Electronics and suitable for LCD TV adapters, gaming console power supplies, and notebook external adapters requiring stable component supply, long-term lifecycle support, and compliance with RoHS and ECOPACK® environmental standards.

Supply support for STPS30SM80CT 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The STPS series targets high-efficiency AC–DC and DC–DC power conversion, with the SM-grade emphasizing optimized thermal performance and avalanche ruggedness for mainstream consumer power supplies.

FAQ

What is the maximum continuous forward current per diode at 70 °C case temperature?

At TC = 70 °C, the device supports 30 A total average forward current for the entire package-i.e., 15 A per diode continuously. This is confirmed in Table 2 of the datasheet under "IF(AV) Per device" and reflects derated capability when both diodes operate simultaneously with adequate heatsinking.

Can STPS30SM80CT be used in non-isolated buck converter outputs?

Yes-it is suitable for buck converter freewheeling paths where the cathode connects to ground and anodes switch to input voltage. The insulated TO-220FPAB package allows direct mounting to a grounded heatsink without additional isolation, simplifying mechanical design versus non-insulated alternatives.

Is the 100 V avalanche rating applicable for repetitive or single-pulse conditions?

The 100 V VARM rating is specified for repetitive avalanche events (tp = 10 µs, Tj = 125 °C), validated per ST's AN1768 and AN2025 application notes. It is not a one-time rating-designs may rely on this capability across normal operation if pulse duration and duty cycle remain within Figure 4 derating limits.

How does thermal coupling affect junction temperature when both diodes conduct simultaneously?

When both diodes conduct, junction temperature rise is calculated as ΔTj(diode1) = P₁ × 5.30 + P₂ × 3.10, where P₁ and P₂ are respective power dissipations. The 3.10 °C/W coupling resistance means heat from diode 2 adds directly to diode 1's thermal load-requiring balanced current sharing or derated total power to avoid exceeding 175 °C Tj.