STMicroelectronics STPS2170AF

Overview

STPS2170AF from STMicroelectronics is a 170 V, 2 A surface-mount Schottky rectifier in SMA Flat package, optimized for high-frequency switching applications with 0.62 V typical forward voltage at 125 °C and 2 A, avalanche-rated operation, and 175 °C maximum junction temperature. It serves as a low-loss freewheeling or polarity protection diode in telecom power supplies and LED lighting drivers where efficiency and thermal robustness are critical.

For engineers reviewing the STPS2170AF datasheet, STPS2170AF pinout, STPS2170AF application, or STPS2170AF equivalent, key selection criteria include reverse voltage rating (170 V), average forward current (2 A), thermal resistance (20 °C/W junction-to-lead), leakage current (<2.8 µA at 25 °C), and avalanche energy capability (165 W at 10 µs).

Technical Context

This Schottky rectifier employs a planar silicon structure with metal-semiconductor junction to eliminate minority-carrier storage delay, enabling negligible switching losses and operation up to 1 MHz. Its low VF (0.62 V typ. @ 125 °C, 2 A) and low IR (<0.5 mA @ 125 °C, VR = VRRM) directly reduce conduction loss and standby power dissipation.

The device is rated for repetitive avalanche energy (165 W at 10 µs, Tj = 125 °C) and operates reliably across -65 °C to +175 °C junction temperature range. Thermal design is supported by a validated Rth(j-l) of 20 °C/W and footprint-compatible SMA Flat packaging for PCB-level conduction cooling.

Key Specifications

Pinout & Package

STPS2170AF is housed in the SMA Flat package - a surface-mount, single-diode outline with cathode band marking, UL94 V0 epoxy, and lead-free construction. Dimensions: 5.60 mm × 2.95 mm × 1.10 mm (L × W × H), with 2.25 mm anode/cathode pad pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS217H and SB2170, STPS2170AF delivers superior thermal resilience (175 °C Tj), lower conduction loss (0.62 V VF), and verified avalanche robustness-making it the preferred choice for space-constrained, high-reliability telecom and LED systems requiring long-term field stability.

Availability

STPS2170AF is available at Aetrix Electronics and suitable for telecom power supplies, LED lighting drivers, SMPS secondary rectification, and industrial DC/DC converters requiring stable component supply, RoHS-compliant sourcing, and long-lifecycle support.

Supply support for STPS2170AF 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 automotive, industrial, and consumer markets.

STPS2170AF belongs to ST's high-voltage Schottky rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in space- and thermal-constrained applications such as LED drivers and telecom infrastructure.

FAQ

What is the cathode marking convention for STPS2170AF?

The cathode is marked by a visible band on the SMA Flat package body, aligned with the cathode terminal. Per Figure 10 and Table 4 of DS10644 Rev 2, this band corresponds to the larger metallized pad side in the recommended footprint - confirming cathode orientation during automated placement and visual inspection.

Can STPS2170AF replace a standard PN-junction diode in an existing 170 V design?

Yes, provided layout accommodates its lower VF and higher leakage. Unlike PN diodes, STPS2170AF has no reverse recovery charge (Qrr = 0), eliminating switching spikes. However, its higher IR at elevated temperature requires verification of standby power and thermal design in the target application.

Is STPS2170AF suitable for use in automotive under-hood applications?

No - while rated to 175 °C junction temperature, STPS2170AF is not qualified to AEC-Q101 and lacks automotive-specific reliability testing (e.g., HTOL, ESD, mechanical shock). It is intended for industrial and commercial power applications, not automotive safety-critical systems.

How does the SMA Flat Notch variant (STPS2170AFN) differ electrically from STPS2170AF?

STPS2170AFN shares identical electrical specifications (VRRM, IF(AV), VF, IR, Tj(max), PARM) and thermal performance (Rth(j-l) = 20 °C/W) with STPS2170AF. The only difference is mechanical: SMA Flat Notch adds a notch for improved tape-and-reel handling and optical alignment during pick-and-place, with no impact on circuit behavior or thermal path.