STMicroelectronics STPS30L40CT

Overview

STPS30L40CT from STMicroelectronics is a dual-center-tap low-drop Schottky rectifier optimized for high-frequency DC-DC converters and switched-mode power supplies. It delivers 30 A total average forward current (15 A per diode), 40 V repetitive peak reverse voltage, and a maximum forward voltage drop of 0.50 V at 15 A and 125°C - enabling efficient low-voltage, high-current rectification in server VRMs and telecom power modules.

For engineers reviewing the STPS30L40CT datasheet, STPS30L40CT pinout, STPS30L40CT application, or STPS30L40CT equivalent, key selection criteria include its TO-220AB package thermal resistance (R_th(j-c) = 0.85 °C/W per diode), avalanche-rated capability (6000 W peak), and negligible switching losses - critical for synchronous rectifier replacement and freewheeling paths in 48 V–12 V intermediate bus converters.

Technical Context

This dual common-cathode Schottky rectifier integrates two independent 40 V/15 A diodes sharing a single cathode terminal (K), with anode terminals A1 and A2. Its design eliminates minority-carrier storage delay, enabling operation up to several MHz without reverse recovery loss - ideal for phase-shifted full-bridge and LLC resonant topologies.

The device features specified avalanche capability (P_ARM = 6000 W at t_p = 1 µs), low thermal resistance (0.85 °C/W junction-to-case per diode), and dV/dt rating of 10,000 V/µs - supporting robust transient immunity in unregulated input stages and polarity protection circuits where inductive kickback must be clamped without snubbers.

Key Specifications

Pinout & Package

STPS30L40CT is housed in a TO-220AB package with isolated tab (electrically connected to cathode K), designed for mechanical mounting and thermal conduction via screw or clip. The three terminals are arranged linearly: A1 (Anode 1), K (Common Cathode), A2 (Anode 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-30CPH04 and MBR3045CT, STPS30L40CT uniquely balances TO-220AB mountability, 0.50 V low-V_F performance at elevated temperature, and guaranteed 6000 W avalanche robustness - making it optimal for compact, high-reliability telecom and server power where both efficiency and fault tolerance are mandatory.

Availability

STPS30L40CT is available at Aetrix Electronics and suitable for server VRMs, telecom DC-DC converters, and industrial motor drive freewheeling circuits requiring stable component supply and long-lifecycle support.

Supply support for STPS30L40CT 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, specializing in power management, analog, microcontrollers, and automotive ICs.

STPS30L40CT belongs to ST's Power Schottky Rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in datacenter, telecom, and industrial equipment where low V_F and avalanche ruggedness are critical.

FAQ

Is STPS30L40CT RoHS compliant?

Yes, STPS30L40CT is RoHS compliant and halogen-free per STMicroelectronics' official product change notification (PCN) dated 2010. The TO-220AB package uses lead-free terminations and meets EU Directive 2011/65/EU requirements without exemptions.

Can STPS30L40CT replace a single 30 A Schottky in a center-tap transformer design?

Yes - its dual-diode structure with common cathode (K) matches center-tap transformer secondary topology exactly. A1 and A2 connect to opposite ends of the center-tapped winding, while K connects to the regulated output rail, eliminating need for two discrete diodes and associated layout complexity.

What is the recommended heatsink mounting torque for STPS30L40CT?

The manufacturer specifies a recommended torque of 0.55 N·m and maximum torque of 0.70 N·m for the TO-220AB mounting screw. Exceeding 0.70 N·m risks cracking the package or degrading thermal interface integrity between the isolated tab and heatsink surface.

Does STPS30L40CT require derating at elevated ambient temperatures?

Yes - per Figure 2 in the datasheet, average forward current must be reduced linearly above 25°C ambient. At 70°C ambient with δ = 0.5 and R_th(j-a) = 15°C/W, the usable I_F(AV) drops to approximately 10.5 A per diode (21 A total) to maintain T_j ≤ 150°C.