SR1502 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR1502 is a through-hole Schottky rectifier diode rated for 20 V DC reverse voltage and 15 A average rectified current. Manufactured by Taiwan Semiconductor Corporation, this component features fast recovery characteristics with a maximum forward voltage of 550 mV at 15 A and operates across a junction temperature range of -55°C to 150°C.

The SR1502 carries a product status designation of "Not For New Designs," indicating that this part is obsolete or being phased out. This status necessitates identification of equivalent and substitute components for ongoing maintenance, repair, and legacy system support where continued sourcing of the original part may become unavailable.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	15	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 15 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 20 V	µA
Mounting Type	Through Hole	-
Package / Case	R-6, Axial	-
Operating Temperature - Junction	-55°C to 150°C	°C
Technology	Schottky	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SR1502 are classified into two categories based on substitution logic:

Parametric Equivalent: Parts that maintain identical or equivalent electrical specifications and mounting characteristics, enabling direct replacement in existing designs and PCB layouts.

Manufacturer Recommended Substitute: Parts that satisfy the core electrical requirements (voltage, current, and speed ratings) but may differ in mounting technology, package form factor, or enhanced specifications. These substitutes require design or assembly process modifications.

The substitution criteria are based strictly on the following parameters:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 20 V
Current - Average Rectified (Io): Must equal or exceed 15 A
Speed: Must maintain Fast Recovery ≤ 500ns, > 200mA (Io)
Technology: Must be Schottky diode technology
RoHS Status: Must maintain ROHS3 Compliance

Parameter Comparison

Parameter	SR1502 (Main Part)	SR1502H (Parametric Equivalent)	TSUP15M45SH (Manufacturer Recommended)
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Category	Diodes, Rectifiers	Diodes, Rectifiers	Diodes, Rectifiers
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	45 V
Current - Average Rectified (Io)	15 A	15 A	15 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 15 A	550 mV @ 15 A	600 mV @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 20 V	500 µA @ 20 V	350 µA @ 45 V
Mounting Type	Through Hole	Through Hole	Surface Mount
Package / Case	R-6, Axial	R-6, Axial	TO-277, 3-PowerDFN
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	-55°C to 175°C
Product Status	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Qualification	-	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

SR1502H - Parametric Equivalent Selection

The SR1502H is a parametric equivalent to the SR1502, maintaining identical electrical specifications and through-hole R-6 axial package configuration. This part carries an Active product status and holds AEC-Q101 automotive qualification, providing enhanced availability and reliability assurance compared to the obsolete SR1502. Direct substitution is supported without design or layout modifications. The SR1502H is suitable for applications requiring exact electrical and mechanical compatibility with existing SR1502 implementations.

TSUP15M45SH - Manufacturer Recommended Substitute

The TSUP15M45SH is a manufacturer-recommended substitute that satisfies all core electrical requirements: 15 A average rectified current, fast recovery characteristics, and Schottky technology. This part provides enhanced reverse voltage rating (45 V versus 20 V), lower reverse leakage current (350 µA at 45 V), and extended junction temperature range (-55°C to 175°C). The TSUP15M45SH carries Active product status and AEC-Q101 qualification.

Substitution of the TSUP15M45SH requires design modification due to surface mount packaging (TO-277, 3-PowerDFN) versus the through-hole configuration of the SR1502. This substitute is applicable for new designs or redesigned assemblies where surface mount technology is implemented. The higher voltage rating provides additional design margin in applications where reverse voltage stress may approach the 20 V specification of the original part.

Frequently Asked Questions (FAQ)

Q: Can SR1502H be used as a direct replacement for SR1502?

A: Yes. The SR1502H maintains identical electrical specifications (20 V reverse voltage, 15 A current rating, 550 mV forward voltage at 15 A) and identical through-hole R-6 axial package configuration. No design or PCB layout modifications are required. The SR1502H carries Active product status and AEC-Q101 qualification, providing improved long-term availability.

Q: What are the key differences between SR1502H and TSUP15M45SH?

A: The primary differences are mounting technology and voltage rating. SR1502H is through-hole R-6 axial package rated for 20 V reverse voltage. TSUP15M45SH is surface mount TO-277 3-PowerDFN package rated for 45 V reverse voltage. Both maintain 15 A current rating and fast recovery characteristics. TSUP15M45SH requires PCB redesign and assembly process modification.

Q: Is TSUP15M45SH suitable for applications designed for SR1502?

A: TSUP15M45SH satisfies all core electrical requirements and exceeds the voltage rating specification. However, substitution requires design modification due to different mounting technology (surface mount versus through-hole) and package form factor. The higher voltage rating (45 V) provides additional design margin but does not affect functional compatibility in circuits designed for 20 V operation.

Q: What is the significance of the "Not For New Designs" status on SR1502?

A: This designation indicates the part is obsolete or being phased out by the manufacturer. Continued sourcing may become unavailable. For new designs, SR1502H or TSUP15M45SH should be selected. For legacy system maintenance, SR1502H provides direct compatibility with existing implementations.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. SR1502H and TSUP15M45SH are both ROHS3 compliant, matching the compliance status of the original SR1502. All parts are REACH unaffected and carry EAR99 ECCN classification.

Q: What is the operating temperature range difference between SR1502 and TSUP15M45SH?

A: SR1502 operates from -55°C to 150°C junction temperature. TSUP15M45SH extends the upper limit to 175°C. This extended range provides additional thermal margin in high-temperature applications but does not affect compatibility in standard operating environments.

Q: Do substitute parts require different PCB layout considerations?

A: SR1502H uses identical through-hole R-6 axial package and requires no layout changes. TSUP15M45SH uses surface mount TO-277 3-PowerDFN package and requires complete PCB footprint redesign, trace routing modifications, and surface mount assembly process implementation.

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