Taiwan Semiconductor Corporation SR1040

Overview

SR1040 from Taiwan Semiconductor is a 10A, 40V repetitive peak reverse voltage Schottky barrier rectifier in TO-220AB package, featuring dual-die construction, 0.55V forward voltage at 5A/25°C, 120A surge capability, and AEC-Q101 qualification option (SR1040H). It serves as primary output rectifier in high-efficiency DC-DC converters.

For engineers reviewing the SR1040 datasheet, SR1040 pinout, SR1040 application, or SR1040 equivalent, key selection factors include its 40V V_RRM, 3°C/W junction-to-case thermal resistance, 10mA reverse leakage at 100°C, guard ring overvoltage protection, and compatibility with surface-mount heatsink mounting per 0.56 N·m torque spec.

Technical Context

The SR1040 operates as a single-phase, dual-die Schottky rectifier with unidirectional conduction and no gate control. Its 40V V_RRM rating targets mid-voltage secondary-side rectification, while the 125°C maximum junction temperature (standard version) supports operation in thermally constrained power supplies.

Thermal performance is defined by 3°C/W R_θJC, enabling 3.3W dissipation at 10°C case-to-ambient delta; electrical behavior includes 500µA max reverse current at 25°C and 10mA at 100°C, confirming stable blocking under elevated thermal stress.

Key Specifications

Pinout & Package

Package: TO-220AB - Three-terminal through-hole package with isolated tab (cathode-connected), matte tin-plated leads compliant with J-STD-002 solderability, UL 94V-0 molding compound, and 1.80g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-10BQ040-M3 and MBR1045CT, the SR1040 offers optimal balance of low V_F, proven thermal resistance, and optional AEC-Q101 qualification-making it preferred for space-constrained, thermally demanding, or automotive-grade 40V rectification.

Availability

SR1040 is available at Aetrix Electronics and suitable for switching mode power supplies, DC-DC converters, and AC adapters requiring stable component supply with consistent parametric performance across production batches.

Supply support for SR1040 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS devices, and MOSFETs since 1979.

The SR1020–SR10150 series was designed specifically for high-efficiency, high-reliability secondary-side rectification in consumer, industrial, and automotive power conversion systems where low V_F, robust surge handling, and thermal predictability are critical.

FAQ

What is the maximum junction temperature for the SR1040?

The SR1040 has a maximum junction temperature of 125°C for the standard version. This value is specified in the Absolute Maximum Ratings table and defines the upper thermal limit for reliable operation. Exceeding 125°C risks permanent degradation of the Schottky junction. The SR1040H variant maintains the same TJ max but adds AEC-Q101 qualification for automotive environments.

Does the SR1040 have a built-in guard ring, and what does it do?

Yes, the SR1040 incorporates a guard ring structure explicitly cited in its features list. This design element prevents premature edge breakdown under high dv/dt conditions-such as those found in high-frequency SMPS-by distributing electric field stress away from the junction periphery. It enables reliable operation at the rated 10,000 V/μs critical rate of rise of off-state voltage.

What is the forward voltage of the SR1040 at 10A and 100°C?

The SR1040 datasheet specifies forward voltage only at 5A and 25°C (0.55V typ). At 10A, V_F increases due to resistive and thermal effects; at 100°C, V_F decreases slightly (~2–3 mV/°C). Extrapolation is not supported-actual V_F at 10A/100°C must be measured or simulated. The SR1040's 10A rating assumes derated V_F within thermal limits defined by R_θJC and heatsink design.

Is the SR1040 pin-compatible with the SR1030 or SR1050?

Yes, the SR1040 is mechanically and electrically pin-compatible with other members of the SR1020–SR10150 family-including SR1030 and SR1050-because all use identical TO-220AB packaging, dual-anode/single-cathode pinout, and shared footprint. Voltage rating differences (30V, 40V, 50V) do not affect physical or electrical interface compatibility, enabling direct substitution where voltage margin permits.

What does the "H" suffix mean in SR1040H?

The "H" suffix in SR1040H denotes AEC-Q101 qualification. This means the part has undergone accelerated stress testing-including temperature cycling, humidity bias, and high-temperature operating life-to validate reliability for automotive electronic components. The SR1040H shares identical electrical and thermal specifications with the standard SR1040 but adds automotive-grade traceability, screening, and failure analysis protocols.