STMicroelectronics STPS30M120SR

Overview

STPS30M120SR from STMicroelectronics is a 120 V, 30 A surface-mount Schottky rectifier diode in a TO-277A (SMPC) package, optimized for high-efficiency DC/DC conversion in server power supplies and telecom rectifiers. It features low forward voltage drop (VF = 0.85 V at 30 A), low reverse recovery charge (QRR = 120 nC), and junction temperature rating up to 175 °C.

For engineers reviewing the STPS30M120SR datasheet, STPS30M120SR pinout, STPS30M120SR application, or STPS30M120SR equivalent, key selection criteria include forward voltage at rated current, thermal resistance (RthJ-C = 1.2 K/W), soft reverse recovery behavior, and SMPC package compatibility with automated SMT assembly and high-power density layouts.

Technical Context

This Schottky diode uses a platinum-silicide (PtSi) barrier structure on a lightly doped N-type silicon substrate to achieve low VF and minimal QRR. Its unipolar conduction mechanism eliminates minority-carrier storage delay, enabling operation at switching frequencies above 300 kHz without reverse recovery losses.

The device is designed for synchronous rectification replacement in isolated DC/DC converters and OR-ing applications where low conduction loss and fast turn-off are critical. Its SMPC package provides direct die-to-PCB thermal path and supports >40 A peak surge current (IFSM) under repetitive 10 ms half-sine conditions.

Key Specifications

Pinout & Package

STPS30M120SR is housed in a TO-277A (SMPC) surface-mount package with three terminals: anode, cathode, and thermal pad. The thermal pad is electrically connected to the cathode and must be soldered to a large PCB copper area for optimal heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-30CPH12-M3 and MBR30H120CT, STPS30M120SR delivers superior thermal performance (1.2 vs. ≥2.0 K/W), lower conduction loss (0.85 V vs. ≥0.87 V), and smaller footprint-making it optimal for high-power-density SMT designs where thermal management and layout area are constrained.

Availability

STPS30M120SR is available at Aetrix Electronics and suitable for server power supplies, telecom DC/DC converters, redundant OR-ing circuits, and industrial motor drive brake circuits requiring stable component supply and long-term production continuity.

Supply support for STPS30M120SR 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 industrial, automotive, and consumer markets.

The STPS series targets high-efficiency power conversion with Schottky diodes optimized for low VF, soft recovery, and rugged packaging-specifically addressing demands of next-generation datacenter and telecom infrastructure.

FAQ

What is the recommended minimum PCB copper area for the thermal pad of STPS30M120SR?

The thermal pad requires a minimum 200 mm² copper area on the top layer, connected via at least six 0.3 mm diameter thermal vias to an internal or bottom-layer ground plane. This achieves RthJ-PCB ≤ 3.5 K/W, limiting junction temperature rise to <60 K at 30 A continuous current with 25 °C ambient.

Can STPS30M120SR be used in parallel for higher current handling?

Yes, but only with matched forward voltage characteristics (±0.02 V tolerance) and symmetrical PCB layout to ensure current sharing within ±10%. External ballast resistors are not recommended due to added conduction loss; instead, use identical trace lengths and thermal coupling to maintain TJ balance within 5 °C.

Does STPS30M120SR require a snubber circuit in hard-switched topologies?

No snubber is required in typical phase-shifted full-bridge or LLC resonant converters due to its soft reverse recovery characteristic. However, a 100 pF/10 Ω RC snubber is advised when used in non-resonant flyback or forward converters operating above 250 kHz to suppress high-frequency ringing caused by parasitic inductance.

Is STPS30M120SR qualified for automotive applications?

No. STPS30M120SR is not AEC-Q101 qualified and lacks automotive-grade screening, extended temperature validation, or failure-in-time (FIT) data. It is intended for industrial and computing applications only; automotive OR-ing or rectification requires ST's automotive-qualified STTH30L06CW or similar.