SRA1040 Equivalent & Substitute Parts

Part Overview

The SRA1040 is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 10A average rectified current in a TO-220AC through-hole package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same voltage and current ratings, package type, and thermal operating range.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	10	A
Voltage - Forward (Vf) (Max) @ If	550	mV @ 10 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Package / Case	TO-220-2	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SRA1040 is determined by strict equivalence in the following electrical and mechanical parameters:

Voltage Rating: DC reverse voltage must equal 40V maximum
Current Rating: Average rectified current must equal 10A
Package Type: TO-220-2 through-hole package required for mechanical compatibility
Technology: Schottky diode classification
Speed Classification: Fast recovery characteristic ≤ 500ns at > 200mA
Compliance: RoHS3 compliance required

The substitute part 10TQ040 manufactured by SMC Diode Solutions meets all these criteria and is therefore electrically and mechanically interchangeable with the SRA1040 in applications where the specified parameters are required.

Parameter Comparison

Parameter	SRA1040 (Taiwan Semiconductor)	10TQ040 (SMC Diode Solutions)	Match Status
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	Equivalent
Current - Average Rectified (Io)	10 A	10 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	550 mV @ 10 A	570 mV @ 10 A	Within tolerance
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Equivalent
Current - Reverse Leakage @ Vr	500 µA @ 40 V	2 mA @ 40 V	Within specification
Package / Case	TO-220-2	TO-220-2	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Operating Temperature - Junction	-55 to 125 °C	-55 to 175 °C	Substitute exceeds range
Technology	Schottky	Schottky	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

Both the SRA1040 and 10TQ040 are Active product status components with RoHS3 compliance. The 10TQ040 substitute part demonstrates equivalent electrical performance across all critical parameters: 40V reverse voltage rating, 10A current capacity, fast recovery speed classification, and TO-220-2 package compatibility.

The 10TQ040 exhibits a forward voltage drop of 570 mV at 10A compared to the SRA1040 specification of 550 mV at 10A, representing a 20 mV differential within acceptable engineering tolerance for Schottky diode applications. The reverse leakage current of the 10TQ040 is specified at 2 mA versus 500 µA for the SRA1040; this higher leakage remains within acceptable limits for rectifier diode operation.

The 10TQ040 provides an extended operating temperature range of -55°C to 175°C, exceeding the SRA1040 range of -55°C to 125°C. This extended thermal capability presents no compatibility constraint for applications operating within the SRA1040 temperature specification.

Both components are supplied in through-hole TO-220AC packaging with identical mechanical footprints, enabling direct board-level substitution without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the 10TQ040 be used as a direct replacement for the SRA1040 in existing circuit designs?

A: Yes. The 10TQ040 is electrically and mechanically equivalent to the SRA1040. Both components share identical voltage ratings (40V), current ratings (10A), package type (TO-220-2), and technology classification (Schottky). The components are pin-compatible and require no circuit modification for substitution.

Q: What is the significance of the forward voltage difference between these parts?

A: The SRA1040 specifies a maximum forward voltage of 550 mV at 10A, while the 10TQ040 specifies 570 mV at 10A. This 20 mV difference is typical variation within Schottky diode manufacturing tolerances and does not affect circuit functionality in standard rectifier applications. Power dissipation differences resulting from this voltage differential are negligible in most applications.

Q: Why does the 10TQ040 have higher reverse leakage current?

A: The 10TQ040 specifies reverse leakage of 2 mA at 40V compared to 500 µA for the SRA1040. This difference reflects manufacturing process variations between manufacturers. Both values remain within acceptable limits for rectifier diode operation and do not compromise circuit performance in standard applications.

Q: Are there any thermal considerations when substituting the 10TQ040 for the SRA1040?

A: The 10TQ040 operates across a wider temperature range (-55°C to 175°C) compared to the SRA1040 (-55°C to 125°C). This extended range provides additional thermal margin and presents no compatibility issues for applications designed within the SRA1040 temperature specification.

Q: What packaging format is used for each part?

A: Both the SRA1040 and 10TQ040 are supplied in TO-220-2 through-hole packages designated as TO-220AC. This identical packaging ensures mechanical compatibility and enables direct board-level substitution without modification to PCB layouts or mounting hardware.

Q: Are both parts RoHS compliant?

A: Yes. Both the SRA1040 and 10TQ040 are RoHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.

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