STMicroelectronics STPS8L30B

Overview

STPS8L30B from STMicroelectronics is a single low-drop Schottky rectifier in DPAK package, rated for 8 A average forward current and 30 V repetitive peak reverse voltage, with typical forward voltage of 0.35 V at 125 °C and 8 A. It is designed for secondary-side rectification in 3.3 V switched-mode power supplies and high-frequency DC/DC converters, delivering reduced conduction loss and minimal heatsink requirement.

For engineers reviewing the STPS8L30B datasheet, STPS8L30B pinout, STPS8L30B application, or STPS8L30B equivalent, key selection criteria include its 2.5 °C/W junction-to-case thermal resistance, avalanche-rated 215 W peak power (10 µs), 150 °C max junction temperature, and ECOPACK®2-compliant DPAK packaging for industrial-grade reliability.

Technical Context

This Schottky diode operates without minority-carrier storage, enabling zero reverse recovery time and minimal switching loss in high-frequency topologies. Its optimized conduction/reverse leakage trade-off-1 mA IR at 25 °C and up to 40 mA at 100 °C under full VRRM-supports stable operation in thermally constrained SMPS secondary stages.

The device uses a planar metal-silicon junction structure with gold-doped silicon substrate to sustain avalanche energy up to 215 W (10 µs pulse, Tj = 125 °C) while maintaining low VF drift across temperature (0.35–0.49 V at 8 A from 25–125 °C).

Key Specifications

Pinout & Package

DPAK (TO-252) surface-mount package with exposed cathode tab for thermal conduction and mechanical anchoring. Dimensions: 6.1 mm × 6.5 mm × 2.3 mm (L × W × H), 0.32 g unit weight, UL 94 V0 epoxy molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB830 and V8P30M, STPS8L30B offers the lowest VF at elevated temperature and a verified 215 W avalanche rating-critical for unclamped flyback or boost-derived topologies where diode stress cannot be fully predicted.

Availability

STPS8L30B is available at Aetrix Electronics and suitable for server power supplies, industrial DC/DC converters, automotive body control modules, and telecom DC bricks requiring stable component supply and long-term manufacturability.

Supply support for STPS8L30B 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 industrial, automotive, and consumer markets.

The STPS series targets high-efficiency, high-reliability power conversion with focus on Schottky rectifiers for SMPS secondary-side and freewheeling roles where low VF, thermal robustness, and avalanche tolerance are decisive.

FAQ

What is the recommended PCB footprint for STPS8L30B?

The official DPAK footprint specifies a 4.95 mm × 5.50 mm cathode pad with 0.64 mm wide anode leads spaced 2.286 mm apart. A minimum 25 mm² copper pour under the tab is required to achieve the rated 2.5 °C/W Rth(j-c); FR4 board with 35 µm copper thickness is validated per Figure 10 in DocID5515 Rev 5.

Does STPS8L30B require a heatsink in typical 3.3 V SMPS applications?

No discrete heatsink is required if the DPAK tab is soldered to ≥25 mm² of 2-oz copper on an inner layer. With Rth(j-c) = 2.5 °C/W and Pcond ≈ 0.28 W at 8 A, junction temperature rise stays below 30 °C above case-well within the 150 °C limit even at 85 °C ambient.

Can STPS8L30B replace a standard PN junction rectifier in existing designs?

Yes, provided the circuit does not rely on reverse recovery charge (Qrr) for snubber timing or ZVS initiation. As a Schottky, it has no Qrr-eliminating switching loss but potentially altering resonant behavior in quasi-resonant topologies; layout parasitics and gate drive timing should be re-verified.

Is STPS8L30B suitable for automotive under-hood applications?

Yes-its 150 °C Tj(max), 30 V VRRM margin over 12 V/24 V systems, and qualified avalanche performance make it appropriate for engine control units and body controllers. However, AEC-Q101 qualification is not claimed; for ASIL-B/C systems, ST's AEC-Q101-certified equivalents (e.g., STPS8L30TV) should be used instead.