STMicroelectronics STPS1150AFN

Overview

STPS1150AFN from STMicroelectronics is a 150 V, 1 A surface-mount Schottky power rectifier in SMA Flat Notch package, featuring 0.62 V typical forward voltage at 125 °C and 1 A, 175 °C maximum junction temperature, and avalanche capability-optimized for high-frequency DC/DC converters and telecom power supplies where low conduction loss and thermal efficiency are critical.

For engineers reviewing the STPS1150AFN datasheet, STPS1150AFN pinout, STPS1150AFN application, or STPS1150AFN equivalent, key selection criteria include forward voltage drop at operating temperature, thermal resistance (20 °C/W junction-to-lead), avalanche energy rating (108 W at 10 µs), ECOPACK2 compliance, and SMA Flat Notch footprint compatibility with automated SMT assembly.

Technical Context

This Schottky rectifier operates as a unidirectional power switching diode with negligible reverse recovery charge, enabling high-efficiency operation in switch-mode topologies up to 24 V input rails. Its low VF minimizes conduction losses, while its 175 °C Tj(max) and 20 °C/W Rth(j-l) support compact thermal design in space-constrained consumer and computing power stages.

The device exhibits 1.0 µA reverse leakage at 25 °C and 150 V reverse bias, rising to 1.0 mA at 125 °C-enabling stable performance across industrial ambient ranges. Avalanche capability (108 W, 10 µs pulse) provides transient overvoltage robustness without external clamping in flyback or boost converter secondary-side rectification.

Key Specifications

Pinout & Package

STPS1150AFN uses the SMA Flat Notch surface-mount package (ECOPACK2 compliant), with cathode indicated by a band on the notch side. The package features UL94 V0 epoxy, optimized for conduction cooling via PCB copper pads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB1150-TB and SS115HE3/5AT, STPS1150AFN delivers lowest VF and best thermal resistance in SMA Flat Notch form factor-making it optimal for high-density, high-efficiency 24 V-output SMPS where every millivolt and degree matters.

Availability

STPS1150AFN is available at Aetrix Electronics and suitable for telecom power supplies, USB-C PD adapters, laptop AC-DC adapters, and industrial DC/DC modules requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for STPS1150AFN 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.

STPS1150AFN belongs to ST's high-voltage Schottky rectifier product line, engineered specifically for high-frequency, high-efficiency power conversion in space- and thermally-constrained applications such as telecom bricks and portable power adapters.

FAQ

What is the maximum allowable ambient temperature for STPS1150AFN at 1 A DC load?

At 1 A DC load with SMA Flat Notch mounted on standard FR4 PCB (35 µm Cu, 2 cm² copper per lead), the maximum ambient temperature is 160 °C-derived from TL = 160 °C rating in Table 1 and Rth(j-l) = 20 °C/W. Junction temperature remains within 175 °C limit only if PCB copper area meets Figure 11 recommendations.

Does STPS1150AFN require a heatsink for 1 A continuous operation?

No external heatsink is required. With ≥2 cm² of 35 µm copper per lead on FR4, Rth(j-a) drops to ~40 °C/W, limiting junction rise to ~40 °C at 1 A-well below 175 °C. Thermal performance is validated in Figure 11 and AN5088 for conduction-cooled layouts.

How does the SMA Flat Notch package differ electrically from standard SMA?

Electrically identical-same VRRM, IF(AV), VF, and IR specs-but SMA Flat Notch offers lower Rth(j-l) (20 vs. 30 °C/W), improved mechanical stability during reflow, and cathode polarity marking via notch instead of band. Footprint differs: 5.52 mm × 3.12 mm vs. SMA's 5.43 mm × 2.63 mm.

Is STPS1150AFN suitable for reverse polarity protection in 24 V systems?

Yes-its 150 V VRRM provides 6.25× margin over 24 V nominal, and 108 W avalanche rating handles 24 V × 4.5 A surge events. However, forward voltage drop (0.62 V) causes 1.5 W loss at 2.4 A, so it's best suited for ≤1 A protection or combined with low-RDS(on) MOSFETs in hybrid schemes.