STMicroelectronics STPS140A

Overview

STPS140A from STMicroelectronics is a 40 V, 1 A surface-mount Schottky rectifier in SMA package, featuring low forward voltage drop (0.43 V typ. at 125 °C), avalanche rating, and ECOPACK2 compliance. It serves as a high-efficiency freewheeling diode or reverse polarity protection device in low-voltage, high-frequency DC-DC converters and TV/set-top box power supplies.

For engineers reviewing the STPS140A datasheet, STPS140A pinout, STPS140A application, or STPS140A equivalent, key selection criteria include its 150 °C max junction temperature, 30 °C/W junction-to-lead thermal resistance (SMA), negligible switching losses, and suitability for compact, thermally constrained consumer power designs.

Technical Context

This Schottky rectifier operates with zero minority-carrier storage, enabling ultrafast recovery and eliminating reverse recovery charge-critical for minimizing switching losses in high-frequency SMPS above 100 kHz. Its metal-semiconductor junction delivers low VF and stable conduction across -65 °C to +150 °C ambient range.

The device is rated for 60 A non-repetitive surge current (10 ms sine) and 65 W repetitive peak avalanche power (10 µs pulse), supporting robust transient handling in unregulated input stages and battery charger front-ends without external snubbers.

Key Specifications

Pinout & Package

STPS140A is supplied in the SMA (DO-214AC) surface-mount package: single-anode/single-cathode configuration with cathode indicated by band. Package dimensions: 4.80–5.35 mm length × 2.25–2.90 mm width × 1.90–2.45 mm height (A1), UL94 V0 epoxy, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS14 and MBR140, STPS140A offers the lowest VF at elevated temperature (0.43 V @ 125 °C), highest avalanche energy (65 W), and tightest thermal resistance (30 °C/W), making it optimal for space-constrained, high-reliability consumer power stages.

Availability

STPS140A is available at Aetrix Electronics and suitable for TV power supply output rectification, set-top box standby supplies, and battery charger freewheeling requiring stable component supply and consistent ECOPACK2 compliance.

Supply support for STPS140A 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, designing and manufacturing analog, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.

The STPS series targets high-efficiency, surface-mount Schottky rectifiers for cost-sensitive, thermally constrained AC-DC and DC-DC power conversion in mass-market consumer electronics.

FAQ

What is the maximum allowable PCB copper area for optimal thermal performance of STPS140A in SMA package?

For STPS140A in SMA package, thermal resistance junction-to-ambient drops from ~50 °C/W (no copper) to ~25 °C/W with 1 cm² of 35 µm copper per lead on FR4 board. Optimal performance is achieved with ≥2 cm² total copper area-split equally under both leads-and thermal vias to inner layers if multilayer PCB is used.

Does STPS140A require a heatsink in 1 A continuous operation?

No heatsink is required for STPS140A at 1 A continuous if mounted on ≥2 cm² of 35 µm copper per lead with adequate airflow (>0.5 m/s). At 130 °C lead temperature (T_L), its 1 A rating assumes natural convection on standard FR4; forced air or internal copper planes further reduce junction temperature below 150 °C limit.

Can STPS140A replace a standard PN rectifier like 1N4007 in a 12 V adapter?

STPS140A can replace 1N4007 only in low-voltage, high-frequency applications-not line-frequency AC-DC. Its 40 V V_RRM is insufficient for 120/230 VAC inputs, and its Schottky construction lacks the 1000 V rating of 1N4007. It is appropriate only for secondary-side DC-DC outputs ≤40 V.

Is STPS140A suitable for automotive applications?

STPS140A is not AEC-Q101 qualified and lacks automotive-grade screening or extended temperature validation beyond its 150 °C T_j(max). While it may function in cabin-temperature environments, ST does not guarantee reliability under automotive thermal cycling, vibration, or EMC stress-use ST's AEC-Q101-certified equivalents (e.g., STPS1L40) for automotive designs.