STMicroelectronics STPS30L45CR

Overview

STPS30L45CR from STMicroelectronics is a dual-center-tap low-drop Schottky rectifier in I2PAK package, rated for 45 V repetitive peak reverse voltage, 30 A total average forward current (15 A per diode), and maximum junction temperature of 150 °C. It delivers 0.42–0.50 V forward voltage at 15 A and 125 °C, enabling high-efficiency operation in DC-DC converters and SMPS secondary-side rectification.

For engineers reviewing the STPS30L45CR datasheet, STPS30L45CR pinout, STPS30L45CR application, or STPS30L45CR equivalent, key selection criteria include its avalanche-rated ruggedness (6000 W peak), low thermal resistance (0.85 °C/W junction-to-case total), insulated heatsink compatibility, and dual-diode center-tap configuration for synchronous rectifier or full-wave bridge topologies.

Technical Context

This dual Schottky rectifier integrates two independent anode-cathode paths sharing a common cathode terminal (center-tap configuration), supporting full-wave rectification without external wiring. Its low VF and low R_th(j-c) enable high-frequency switching (>100 kHz) with minimal conduction and thermal losses.

The device is avalanche-rated to 6000 W (1 µs pulse, T_j = 25 °C) and features dV/dt capability of 10,000 V/µs - critical for noise-immune operation in fast-switching converters. The I2PAK package provides mechanical robustness and direct heatsink mounting via the metal slug, though through-hole mounting is mandatory per ST's specification.

Key Specifications

Pinout & Package

The STPS30L45CR uses an I2PAK (TO-263 variant) package with three terminals: two anodes (A1, A2) and one common cathode (K). The metal slug (heatsink pad) is electrically connected to the cathode and must be mounted via through-hole soldering - surface-mount attachment is prohibited. Thermal performance relies on direct metal-to-heatsink contact.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS30L45CT, the STPS30L45CR delivers 47% lower thermal resistance and smaller footprint; versus VS-30CPH045, it eliminates interconnect inductance and layout complexity inherent in discrete dual-diode solutions - making it optimal for space-constrained, high-reliability SMPS outputs.

Availability

STPS30L45CR is available at Aetrix Electronics and suitable for server VRM output stages, industrial DC-DC converters, and telecom power shelves requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for STPS30L45CR 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 industrial, automotive, and consumer markets.

The STPS30L45CR belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for high-frequency, low-voltage secondary-side rectification in switched-mode power supplies where thermal performance and avalanche ruggedness are critical.

FAQ

Is the metal slug of the STPS30L45CR electrically isolated?

No - the I2PAK metal slug is internally connected to the common cathode (K) terminal. When mounted to a heatsink, that heatsink becomes part of the cathode net and must be electrically isolated from other system potentials unless referenced to the same ground. ST explicitly prohibits surface-mount soldering of the slug; only through-hole mounting is allowed per datasheet Section 7.

What is the maximum surge current rating for STPS30L45CR at T_c = 125 °C?

Per Table 2, the non-repetitive surge forward current (I_FSM) is 220 A for 10 ms sinusoidal half-cycle, regardless of case temperature. However, Figure 5 shows derated values: at T_c = 125 °C and t = 10 ms, the allowable I_M drops to approximately 140 A. This reflects thermal limitation - not device failure - and must be verified against actual heatsink thermal mass and duty cycle.

Can STPS30L45CR replace STPS30L45CFP in a design?

Only with electrical and mechanical re-evaluation. While both share identical die characteristics, STPS30L45CFP uses TO-220FPAB with 2000 V_DC insulation and 4 °C/W R_th(j-c) per diode, whereas STPS30L45CR (I2PAK) has no internal insulation and 0.85 °C/W total R_th(j-c). Substitution requires verifying creepage/clearance compliance and recalculating thermal rise under identical load conditions.

Does STPS30L45CR support synchronous rectification control?

No - it is a passive Schottky rectifier, not a controlled switch. It conducts automatically when forward-biased and blocks when reverse-biased. Synchronous rectification requires active MOSFETs with gate drivers. However, its low V_F and fast recovery make it a high-performance alternative to synchronous designs where control complexity or cost must be minimized.