SR1202 A0G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR1202 A0G is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 20V DC reverse voltage and 12A average rectified current in a DO-201AD through-hole axial package. This component is classified as Active product status and is RoHS3 compliant. The SR1202 A0G serves as a high-current fast-recovery rectifier suitable for power supply and switching applications requiring low forward voltage drop characteristics.

Equivalent and substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits current rating adjustments within application parameters. The substitute parts listed maintain the same voltage rating and package configuration while offering alternative current ratings and forward voltage characteristics from different manufacturers.

Key Parameters

Parameter	SR1202 A0G
Voltage - DC Reverse (Vr) (Max)	20 V
Current - Average Rectified (Io)	12 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 12 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 20 V
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Operating Temperature - Junction	-50°C ~ 150°C
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SR1202 A0G is determined by the following critical parameters that must remain constant or compatible:

Fixed Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 20 V
Mounting Type: Through Hole
Package / Case: DO-201AD, Axial
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA @ 20 V

Variable Parameters (Substitution Basis):

Current - Average Rectified (Io): Substitute parts range from 3A to 5A, which are lower than the 12A rating of the SR1202 A0G
Voltage - Forward (Vf) (Max) @ If: Varies by manufacturer and current rating
Operating Temperature - Junction: Range varies by substitute part

The substitute parts listed are grouped by current rating capability. Parts with lower current ratings (3A and 5A) are suitable for applications where the full 12A capacity of the SR1202 A0G is not required. All substitute parts maintain the 20V reverse voltage specification and DO-201AD package configuration, ensuring mechanical and electrical compatibility within their respective current limitations.

Parameter Comparison

Parameter	SR1202 A0G	1N5820-TP	SB320-E3/54	SB520	SB520-E3/54	SB520-E3/73
Manufacturer	Taiwan Semiconductor Corporation	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	onsemi	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	20 V	20 V	20 V	20 V
Current - Average Rectified (Io)	12 A	3 A	3 A	5 A	5 A	5 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 12 A	475 mV @ 3 A	490 mV @ 3 A	550 mV @ 5 A	480 mV @ 5 A	480 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)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V	500 µA @ 20 V
Mounting Type	Through Hole	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	DO-201AD, Axial
Operating Temperature - Junction	-50°C ~ 150°C	-55°C ~ 125°C	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Product Status	Active	Active	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compatibility):

The SB520-E3/54 and SB520-E3/73 from Vishay General Semiconductor - Diodes Division are the preferred active substitutes for the SR1202 A0G. Both parts maintain Active product status, are RoHS3 compliant, and provide 5A current rating with improved forward voltage characteristics (480 mV @ 5A versus 550 mV @ 12A). These parts support the full operating temperature range of -65°C to 150°C and are available in high inventory quantities (11,502 and 4,400 units respectively).

Secondary Substitutes (Lower Current Rating):

The 1N5820-TP from Micro Commercial Co and SB320-E3/54 from Vishay are suitable for applications requiring 3A or less. Both maintain Active status and RoHS3 compliance. The 1N5820-TP operates at -55°C to 125°C, while the SB320-E3/54 extends to -65°C to 150°C. These parts are appropriate only when circuit design permits reduced current capacity.

Obsolete Status Consideration:

The SB520 from onsemi carries Obsolete product status and should not be selected for new designs or long-term supply requirements, despite adequate technical specifications and available inventory.

Compliance and Regulatory:

All recommended substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification, matching the regulatory profile of the SR1202 A0G.

Frequently Asked Questions (FAQ)

Q: Can the 1N5820-TP or SB320-E3/54 (3A parts) directly replace the SR1202 A0G (12A part)?

A: Direct replacement is possible only if the application circuit operates at 3A or below. The 3A-rated parts are electrically and mechanically compatible with the SR1202 A0G in the DO-201AD package, but current capacity is reduced. Circuit analysis must confirm that maximum operating current does not exceed 3A.

Q: What is the difference between SB520-E3/54 and SB520-E3/73?

A: Both parts are manufactured by Vishay General Semiconductor - Diodes Division with identical electrical specifications: 20V reverse voltage, 5A current rating, 480 mV forward voltage at 5A, and -65°C to 150°C operating temperature range. The difference lies in packaging designation (E3/54 versus E3/73), which reflects different tape and reel configurations. Selection depends on procurement and assembly equipment compatibility.

Q: Why is the SB520 from onsemi listed if it is Obsolete?

A: The SB520 is included for reference purposes only, as it appears in the substitute list for the SR1202 A0G. Obsolete status indicates that onsemi has discontinued active production and support. New designs should not incorporate this part. The active alternatives SB520-E3/54 and SB520-E3/73 from Vishay provide equivalent functionality with ongoing manufacturer support.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts—1N5820-TP, SB320-E3/54, SB520, SB520-E3/54, and SB520-E3/73—are RoHS3 compliant and REACH Unaffected, matching the regulatory compliance of the SR1202 A0G.

Q: What is the significance of the DO-201AD package specification?

A: The DO-201AD package is an axial through-hole configuration with standardized lead spacing and dimensions. All substitute parts use the identical DO-201AD package, ensuring mechanical compatibility with existing PCB layouts and assembly processes. No board redesign or rework is required for package accommodation.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) varies with current rating. The SR1202 A0G specifies 550 mV @ 12A, while the 5A substitutes (SB520-E3/54 and SB520-E3/73) specify 480 mV @ 5A, and the 3A substitutes specify 475-490 mV @ 3A. Lower forward voltage reduces power dissipation and heat generation. Circuit designs with tight voltage margin requirements must account for these differences in power supply regulation calculations.

Q: Can operating temperature range differences affect substitution decisions?

A: Yes. The SR1202 A0G operates from -50°C to 150°C. The 1N5820-TP operates from -55°C to 125°C, which is narrower at the upper limit. If the application requires sustained operation above 125°C, the 1N5820-TP is unsuitable. The SB320-E3/54, SB520-E3/54, and SB520-E3/73 all support -65°C to 150°C, providing equivalent or superior temperature coverage.

Q: What inventory considerations apply to these substitutes?

A: Current inventory levels are: SR1202 A0G (1,002 units), 1N5820-TP (13,856 units), SB320-E3/54 (8,259 units), SB520 (2,260 units), SB520-E3/54 (11,502 units), and SB520-E3/73 (4,400 units). Higher inventory levels for substitute parts may provide supply chain advantages for high-volume procurement.

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