SR305 A0G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR305 A0G is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as Active and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and thermal operating ranges to ensure direct functional replacement in circuit applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 3 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 50 V
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SR305 A0G are grouped into two categories based on electrical compatibility:

Category 1: Direct Current Rating Match (3 A) Parts maintaining the 3 A average rectified current specification allow direct replacement without circuit redesign. These parts share identical voltage ratings, package configuration, and fast recovery characteristics.

Category 2: Upgraded Current Rating (5 A) Parts rated for 5 A average rectified current provide higher current capacity while maintaining the 50 V reverse voltage rating and DO-201AD package. These parts are electrically compatible for applications where the SR305 A0G operates below its maximum current rating, offering improved thermal margin and reliability headroom.

Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V (required match)
Mounting Type: Through Hole (required match)
Package / Case: DO-201AD, Axial (required match)
Technology: Schottky (required match)
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io) (required match)
Current - Average Rectified (Io): 3 A minimum (equal or higher acceptable)
Operating Temperature - Junction: Must encompass or exceed -55°C to 150°C range

Parameter Comparison

Parameter	SR305 A0G (Main)	SR305-TP	SB550-T	SB550-E3/54	SB550-E3/73
Manufacturer	Taiwan Semiconductor Corporation	Micro Commercial Co	Diodes Incorporated	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	3 A	3 A	5 A	5 A	5 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 3 A	720 mV @ 3 A	670 mV @ 5 A	650 mV @ 5 A	650 mV @ 5 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 50 V	1 mA @ 50 V	500 µA @ 50 V	500 µA @ 50 V	500 µA @ 50 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 125°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Product Status	Active	Not For New Designs	Active	Active	Active
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Direct Current Match): No substitute parts maintain both Active product status and the exact 3 A current rating. The SR305-TP provides identical current specifications but carries a "Not For New Designs" status, limiting its use to legacy system maintenance and repair applications only.

Recommended Substitutes (Active Status, Upgraded Current Rating): The SB550-T, SB550-E3/54, and SB550-E3/73 are all Active products rated for 5 A average rectified current. These parts are electrically compatible with the SR305 A0G in applications where circuit current demands do not exceed 3 A. All three maintain the 50 V reverse voltage rating, DO-201AD package configuration, and fast recovery characteristics. The SB550-T is manufactured by Diodes Incorporated with the highest inventory availability (30,100 pieces). The SB550-E3/54 and SB550-E3/73 are manufactured by Vishay General Semiconductor - Diodes Division with 7,657 and 2,200 pieces in stock respectively.

Compliance Considerations: All substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of the SR305 A0G. Operating temperature ranges for the SB550 series (-65°C ~ 150°C) exceed the SR305 A0G specification (-55°C ~ 150°C), providing extended low-temperature performance capability.

Frequently Asked Questions (FAQ)

Q: Can the SB550-T replace the SR305 A0G in all applications? A: The SB550-T is electrically compatible with the SR305 A0G when circuit current requirements do not exceed 3 A. The higher 5 A rating provides additional current capacity margin. Both parts share identical 50 V reverse voltage rating, DO-201AD package, and fast recovery characteristics. Verify circuit current demands remain within the SR305 A0G's 3 A specification before substitution.

Q: What is the difference between the SB550-E3/54 and SB550-E3/73? A: Both parts are manufactured by Vishay General Semiconductor - Diodes Division with identical electrical specifications: 50 V reverse voltage, 5 A average rectified current, 650 mV forward voltage at 5 A, and DO-201AD package. The primary difference is packaging format (Cut Tape) and inventory availability. The SB550-E3/54 has 7,657 pieces in stock while the SB550-E3/73 has 2,200 pieces in stock.

Q: Why is the SR305-TP listed as a substitute if it has "Not For New Designs" status? A: The SR305-TP maintains identical electrical specifications to the SR305 A0G (50 V, 3 A, DO-201AD package) and is suitable for replacement in existing systems and legacy applications. However, for new circuit designs, the Active-status SB550 series parts are recommended to ensure long-term component availability and manufacturer support.

Q: Does the higher current rating of the SB550 series affect forward voltage characteristics? A: The SB550 series exhibits lower forward voltage (650-670 mV @ 5 A) compared to the SR305 A0G (700 mV @ 3 A). This difference reflects the different current levels at which forward voltage is specified. When operating at 3 A or below, the SB550 series will exhibit lower forward voltage drop, resulting in reduced power dissipation and improved thermal performance.

Q: Are all substitute parts available in the same packaging format as the SR305 A0G? A: All substitute parts use the DO-201AD axial through-hole package, ensuring mechanical and electrical compatibility with existing PCB layouts. The SR305 A0G is supplied in standard packaging while substitute parts are available in Cut Tape (CT) format, which is standard for high-volume procurement and automated assembly processes.

Q: What is the reverse leakage current difference between the SR305 A0G and SR305-TP? A: The SR305 A0G specifies 500 µA reverse leakage at 50 V, while the SR305-TP specifies 1 mA reverse leakage at 50 V. This two-fold difference may be significant in high-impedance or precision analog circuits where leakage current affects circuit performance. For general rectification applications, both values are acceptable.

Q: Can the SB550 series be used in reverse polarity protection circuits? A: The SB550 series maintains the same 50 V reverse voltage rating and fast recovery characteristics as the SR305 A0G, making them suitable for reverse polarity protection applications. The lower forward voltage drop of the SB550 series provides improved efficiency in this application compared to the SR305 A0G.

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