SR302-T Equivalent & Substitute Parts

Part Overview

The SR302-T is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 20 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The SR302-T provides fast recovery characteristics suitable for applications requiring efficient rectification at moderate voltage and current levels.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	20 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 20 V
Package / Case	DO-201AD, Axial
Mounting Type	Through Hole
Operating Temperature - Junction	-65°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SR302-T are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): 20 V minimum
Current - Average Rectified (Io): 3 A minimum
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Compatibility Requirements:

Package / Case: DO-201AD or equivalent axial through-hole configuration
Mounting Type: Through Hole

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected

Substitute parts are grouped into two categories: Direct Equivalents (matching 20 V / 3 A specifications) and Uprated Alternatives (exceeding current rating while maintaining voltage compatibility).

Parameter Comparison

Parameter	SR302-T	1N5820-E3/54	1N5820-E3/73	1N5820G	SB520
Manufacturer	Diodes Incorporated	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	onsemi	onsemi
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	20 V	20 V	20 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	5 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 3 A	475 mV @ 3 A	475 mV @ 3 A	475 mV @ 3 A	550 mV @ 5 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 20 V	2 mA @ 20 V	2 mA @ 20 V	2 mA @ 20 V	500 µA @ 20 V
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AA, DO-27, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-55°C ~ 150°C
Product Status	Obsolete	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

The 1N5820-E3/73 and 1N5820-E3/54 from Vishay General Semiconductor - Diodes Division are the preferred direct equivalents for the SR302-T. Both parts maintain the 20 V / 3 A electrical specifications, DO-201AD package configuration, and through-hole mounting. These parts are classified as Active products, ensuring long-term availability and supply chain stability. Both are ROHS3 Compliant and REACH Unaffected. The 1N5820-E3/73 offers higher inventory availability (4480 Pcs) compared to the 1N5820-E3/54 (1700 Pcs).

The 1N5820G from onsemi is an alternative direct equivalent with Active product status. This part maintains 20 V / 3 A specifications and fast recovery characteristics. The 1N5820G is supplied in bulk packaging and uses an axial through-hole configuration compatible with DO-201AA and DO-27 standards.

Secondary Substitute (Uprated Alternative):

The SB520 from onsemi is an uprated alternative rated for 20 V / 5 A, providing increased current capacity while maintaining voltage compatibility. This part is classified as Obsolete. The SB520 is suitable for applications where higher current margin is required within the same voltage class. The DO-201AD package and through-hole mounting remain consistent with the SR302-T.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with the original SR302-T. Active product status for the 1N5820 series (both Vishay and onsemi variants) provides superior long-term availability compared to the obsolete SR302-T and SB520 alternatives.

Frequently Asked Questions (FAQ)

Q: Can the 1N5820-E3/73 directly replace the SR302-T without circuit modification?

A: The 1N5820-E3/73 is electrically and mechanically compatible with the SR302-T. Both parts share identical voltage (20 V) and current (3 A) ratings, fast recovery speed characteristics, and DO-201AD axial through-hole packaging. Direct substitution is supported without circuit modification.

Q: What is the difference between 1N5820-E3/73 and 1N5820-E3/54?

A: Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications (20 V / 3 A) and package configuration (DO-201AD). The primary differences are packaging format (1N5820-E3/73 supplied in Cut Tape; 1N5820-E3/54 also in Cut Tape) and inventory levels. The 1N5820-E3/73 has higher stock availability (4480 Pcs versus 1700 Pcs).

Q: Why is the SB520 listed as a substitute if it is rated for 5 A instead of 3 A?

A: The SB520 is an uprated alternative that maintains the 20 V voltage rating while providing increased current capacity (5 A). This part is suitable for applications where additional current margin is beneficial. The higher current rating does not prevent substitution in circuits designed for 3 A operation, as the part will operate within its safe operating area.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed (1N5820-E3/73, 1N5820-E3/54, 1N5820G, and SB520) are ROHS3 Compliant and REACH Unaffected, matching the regulatory status of the original SR302-T.

Q: What is the operating temperature range difference between the SR302-T and its substitutes?

A: The SR302-T operates from -65°C to 150°C. The 1N5820 series (1N5820-E3/73, 1N5820-E3/54, and 1N5820G) operate from -65°C to 125°C, providing a 25°C reduction in maximum junction temperature. The SB520 operates from -55°C to 150°C. Applications requiring operation above 125°C should verify compatibility with the reduced upper temperature limit of the 1N5820 series.

Q: Is the 1N5820G package compatible with the SR302-T footprint?

A: The 1N5820G uses an axial through-hole configuration compatible with DO-201AA and DO-27 standards. While the SR302-T uses DO-201AD packaging, both are axial through-hole formats with compatible lead spacing and mounting characteristics, supporting direct board-level substitution.

Q: What is the forward voltage difference between the SR302-T and the 1N5820 series?

A: The SR302-T has a maximum forward voltage of 550 mV @ 3 A, while the 1N5820 series (1N5820-E3/73, 1N5820-E3/54, and 1N5820G) have a maximum forward voltage of 475 mV @ 3 A. The 1N5820 series exhibits lower forward voltage drop, resulting in reduced power dissipation in rectification applications.

Q: Can the 1N5820G be used in high-volume production?

A: The 1N5820G is classified as Active with 3400 Pcs in stock inventory, supporting high-volume production requirements. The part is manufactured by onsemi and maintains consistent electrical and mechanical specifications across production runs.

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