STMicroelectronics STPS20SM100SFP

Overview

STPS20SM100SFP from STMicroelectronics is a 100 V, 20 A average forward current Schottky rectifier in TO-220AB package, featuring 0.63 V typical forward voltage at 25 °C and 20 A, avalanche-rated operation up to 1080 W, and thermal resistance R_th(j-c) of 1.3 °C/W - optimized for high-frequency SMPS in desktop power supplies and LED lighting.

For engineers reviewing the STPS20SM100SFP datasheet, STPS20SM100SFP pinout, STPS20SM100SFP application, or STPS20SM100SFP equivalent, key selection criteria include low conduction loss (P ≈ 0.6 × I_F(AV) + 0.005 × I_F(RMS)²), 150 °C max junction temperature, and ECOPACK®2-compliant packaging for industrial-grade reliability.

Technical Context

This single-diode Schottky rectifier uses a planar silicon structure with metal-semiconductor junction to enable fast switching (no minority-carrier storage) and low forward voltage drop. Its avalanche rating supports transient energy absorption without failure under repetitive surge conditions (I_FSM = 350 A, t_p = 10 ms).

Thermal design relies on direct case-to-heatsink conduction (R_th(j-c) = 1.3 °C/W), with derating curves confirming stable 20 A operation at T_C = 125 °C under δ = 0.5 square-wave duty cycle - critical for compact, high-efficiency AC/DC adapters.

Key Specifications

Pinout & Package

TO-220AB package with isolated tab (terminal 2), three terminals: terminal 1 (anode), terminal 2 (cathode/tab), terminal 3 (anode). Mounting torque: 0.55 N·m (max 0.70 N·m); epoxy meets UL 94 V0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH05-M3 and MUR20100CT, STPS20SM100SFP uniquely balances 100 V blocking, 0.63 V low-loss conduction, and zero-recovery switching - making it optimal for high-frequency, high-efficiency 48–72 V output SMPS where thermal headroom and EMI control are critical.

Availability

STPS20SM100SFP is available at Aetrix Electronics and suitable for desktop power supplies, LED lighting drivers, game console adapters, and notebook AC adapters requiring stable component supply across multi-year production cycles.

Supply support for STPS20SM100SFP 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 industrial, automotive, and consumer applications.

The STPS series targets high-efficiency power conversion, with STPS20SM100SFP specifically engineered for high-current, high-frequency Schottky rectification in compact, thermally constrained AC/DC and DC/DC converters.

FAQ

Is STPS20SM100SFP pin-compatible with STPS20SM100ST?

Yes - both share identical TO-220AB mechanical outline and terminal assignment (Terminals 1/3 = anode, Terminal 2 = cathode/tab). The 'F' suffix denotes tape-and-reel packaging; electrical and thermal specs are identical. No PCB redesign is needed when substituting between ST and SFP variants.

What is the maximum allowable case temperature for continuous 20 A operation?

Per Figure 2 in DS6172 Rev 4, 20 A I_F(AV) is rated at T_C = 125 °C with δ = 0.5 square wave. Operation above 125 °C requires derating: at T_C = 135 °C, max I_F(AV) drops to ~17.5 A; at 145 °C, it falls to ~14 A. Thermal interface resistance must remain ≤0.25 °C/W for safe margin.

Does STPS20SM100SFP require a heatsink in a 20 A application?

Yes - with R_th(j-c) = 1.3 °C/W and typical power dissipation of ~12.6 W at 20 A, junction temperature would exceed 150 °C without heatsinking. A minimum 10 cm² aluminum heatsink (R_th(c-a) ≤ 4.5 °C/W) is required to maintain T_j ≤ 135 °C at 25 °C ambient, per thermal curves in DS6172.

Can STPS20SM100SFP be used in place of a standard PN rectifier like 1N5408?

No - while both are diodes, STPS20SM100SFP is a Schottky device with 100 V V_RRM and no reverse recovery, whereas 1N5408 is a 1000 V PN rectifier with 2 A rating and 2 µs t_rr. Substitution would cause immediate overcurrent failure due to mismatched current rating and voltage class. It replaces higher-current Schottkys like STPS30H100CG, not general-purpose PN diodes.