STMicroelectronics STPS30120CTN

Overview

STPS30120CTN from STMicroelectronics is a dual center-tap Schottky rectifier in TO-220AB narrow leads package, rated for 120 V repetitive peak reverse voltage, 2 × 15 A average forward current per diode at Tc = 145 °C, and 175 °C maximum junction temperature. It delivers low forward voltage drop (0.70 V typ. at 15 A, 125 °C) with avalanche rating and ECOPACK®2 compliance, optimized for high-frequency SMPS in notebook and LCD adapters.

For engineers reviewing the STPS30120CTN datasheet, STPS30120CTN pinout, STPS30120CTN application, or STPS30120CTN equivalent, key selection criteria include thermal derating under simultaneous dual-diode conduction, reverse leakage stability up to 125 °C, junction-to-case thermal resistance (2.2 °C/W per diode), and mechanical compatibility with narrow-lead TO-220AB heatsink mounting.

Technical Context

This dual-center-tap Schottky rectifier integrates two independent anode-cathode paths sharing a common cathode terminal, enabling synchronous rectification in center-tapped transformer topologies. Its design targets high-frequency switching (≥100 kHz) with minimal reverse recovery charge and low conduction loss-calculated via P = 0.59 × IF(AV) + 0.01 × IF²(RMS).

Thermal management relies on conduction cooling through the case, with validated junction-to-case resistance of 2.2 °C/W per diode and coupling resistance of 0.3 °C/W between diodes. Avalanche energy rating is specified at 480 W (10 µs pulse, Tj = 125 °C), supporting transient overvoltage robustness without external snubbers.

Key Specifications

Pinout & Package

STPS30120CTN uses the TO-220AB narrow leads package (1.90 g, 50 pcs/tube), featuring insulated epoxy meeting UL 94 V0, recommended torque 0.55 N·m, and conduction-based cooling. Pin configuration is standardized for dual-center-tap Schottky rectifiers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS30H100CG and VS-30CPH07, STPS30120CTN uniquely balances 120 V rating, avalanche robustness, and narrow-lead TO-220AB form factor-making it optimal for space-constrained, high-reliability 19 V/12 V adapter designs where thermal and transient margins are co-constrained.

Availability

STPS30120CTN is available at Aetrix Electronics and suitable for notebook AC adapters, LCD monitor power supplies, and industrial LED drivers requiring stable component supply, consistent thermal performance, and long-term manufacturing continuity.

Supply support for STPS30120CTN 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

The STPS series targets high-efficiency, high-reliability power conversion-specifically engineered for Schottky rectification in SMPS, DC/DC converters, and LED lighting where low VF, thermal resilience, and avalanche ruggedness are system-critical.

FAQ

What is the maximum continuous forward current per diode at 100 °C case temperature?

At Tc = 100 °C, the maximum average forward current per diode is 18.5 A (derated from 15 A at 145 °C using Figure 2). This value is confirmed by the normalized IF(AV) vs. Tamb curve in DS4230 Rev 5, page 2, assuming δ = 0.5 duty cycle and proper heatsinking.

Can STPS30120CTN be used in non-center-tapped topologies like bridge rectifiers?

No-it is internally configured as two anodes sharing one cathode (A1–K–A2), making it unsuitable for full-bridge or single-diode applications. Using it outside center-tapped forward or push-pull circuits risks reverse biasing one diode beyond VRRM due to internal connection asymmetry.

How does the TO-220AB narrow leads variant differ electrically from the standard TO-220AB (STPS30120CT)?

Electrically identical-same VRRM, IF(AV), VF, and thermal parameters. The narrow leads variant (CTN) has reduced lead width (b1 = 0.95–1.20 mm vs. 1.14–1.55 mm) for tighter PCB pitch and improved automated insertion yield, with identical thermal resistance and torque specs.

Is the 480 W avalanche rating applicable to repetitive pulses or only single events?

It is specified for single 10 µs pulses at Tj = 125 °C (Table 1). Repetitive avalanche operation is not characterized in DS4230 Rev 5; designers must ensure transient energy per event stays below 4800 µJ (480 W × 10 µs) and allow sufficient cooling time between events to avoid cumulative junction heating.