STMicroelectronics STPST1H100AF

Overview

STPST1H100AF from STMicroelectronics is a 1 A, 100 V Schottky trench rectifier in SOD128Flat package, optimized for high-frequency SMPS with low conduction and switching losses. It delivers typ. 0.580 V forward voltage at 1 A/125 °C, supports 175 °C max junction temperature, and is avalanche-tested for robustness in flyback and auxiliary power supplies.

For engineers reviewing the STPST1H100AF datasheet, STPST1H100AF pinout, STPST1H100AF application, or STPST1H100AF equivalent, key selection criteria include VF/IR trade-off, thermal resistance (Rth(j-l) = 15 °C/W), avalanche energy rating (EAS), ECOPACK2 compliance, and flat-package layout compatibility with space-constrained PCBs.

Technical Context

This device uses ST's proprietary trench Schottky technology to minimize reverse leakage while maintaining ultra-low VF - achieving <0.635 V at 1 A/125 °C and <0.480 V at 0.5 A/125 °C. Its low Qrr and soft recovery behavior reduce EMI and switching losses in high-frequency DC/DC converters.

The SOD128Flat package enables efficient thermal transfer via lead-to-PCB conduction (Rth(j-l) = 15 °C/W), and its 175 °C Tj(max) rating supports operation in thermally demanding environments such as telecom auxiliary rails and smart metering power stages.

Key Specifications

Pinout & Package

SOD128Flat is a surface-mount, dual-terminal, flat-lead package with cathode (K) and anode (A) terminals exposed on opposite sides of the molded body. Its 2.4 mm × 4.7 mm footprint and 1.0 mm height support automated placement and high-density board layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS1H100S and VSSAF110-M3/5AT, STPST1H100AF offers superior thermal management (15 °C/W), guaranteed avalanche ruggedness, and higher ambient operating margin - making it optimal for industrial and telecom auxiliary supplies where reliability and thermal headroom are prioritized.

Availability

STPST1H100AF is available at Aetrix Electronics and suitable for DC/DC converters, LED lighting drivers, and auxiliary power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for STPST1H100AF 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

STPST1H100AF belongs to ST's high-efficiency Schottky trench rectifier product line, engineered specifically for miniaturized, high-frequency switched-mode power supplies where low VF, high Tj, and avalanche robustness are essential.

FAQ

What is the maximum allowable case temperature for STPST1H100AF in continuous operation?

The device has no defined "case temperature" limit - instead, its absolute maximum junction temperature is +175 °C. Thermal design must ensure TJ ≤ 175 °C using Rth(j-l) = 15 °C/W and measured lead temperature (TL). At TL = 155 °C, IF(AV) = 1 A is rated; exceeding TL requires derating per Figure 3 in DS14189.

Does STPST1H100AF support bidirectional current flow?

No. STPST1H100AF is a unidirectional Schottky rectifier: current flows only from anode to cathode under forward bias. It blocks reverse current up to 100 V (VRRM), with leakage <1 mA at 125 °C. It is not designed for AC or bidirectional switching applications.

Can STPST1H100AF replace standard silicon PN rectifiers in existing designs?

Yes - with caveats. Its 100 V VRRM and 1 A rating match many 1N5819/1N5822 replacements, but its lower VF reduces conduction loss and heat rise. However, designers must verify reverse leakage sensitivity in high-impedance bias networks and confirm layout accommodates the SOD128Flat footprint and thermal pad requirements.

Is STPST1H100AF qualified for automotive applications?

No. STPST1H100AF is not AEC-Q101 qualified. While its 175 °C Tj rating exceeds typical automotive under-hood requirements, it lacks the extended temperature validation, process controls, and test reporting required for automotive-grade qualification. For automotive use, consider ST's AEC-Q101-qualified STTH1L06 or similar.