SR1202 B0G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR1202 B0G is a 20V, 12A Schottky rectifier diode in DO-201AD axial through-hole packaging manufactured by Taiwan Semiconductor Corporation. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent alternatives for ongoing design and production requirements. The part operates across a junction temperature range of -50°C to 150°C and maintains ROHS3 compliance with unlimited moisture sensitivity rating.

Substitute parts must maintain electrical compatibility across reverse voltage, forward current capacity, and thermal characteristics while preserving the through-hole DO-201AD package format.

Key Parameters

Parameter	SR1202 B0G	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	12	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 12 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 20 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-50°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the SR1202 B0G is based on the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 20V
Package / Case: Must be DO-201AD, Axial through-hole format
Technology: Schottky rectifier diode
RoHS Status: ROHS3 Compliant
Mounting Type: Through Hole

Secondary Compatibility Factors:

Current - Average Rectified (Io): Determines application suitability
Voltage - Forward (Vf) (Max) @ If: Affects power dissipation characteristics
Operating Temperature - Junction: Must support application thermal requirements
Speed: Fast Recovery classification ≤ 500ns, > 200mA (Io)

Substitute parts are grouped into two categories:

Direct Equivalent (12A Rating): SR1202 A0G maintains identical electrical specifications and current capacity, differing only in product status (Active vs. Discontinued).

Functional Alternatives (Lower Current Ratings): Parts rated at 3A or 5A average rectified current provide electrical compatibility at reduced current capacity. These alternatives are suitable for applications where the 12A rating exceeds design requirements. Parts include 1N5820-TP (3A), SB320-E3/54 (3A), SB320-E3/73 (3A), SB520 (5A), SB520-E3/54 (5A), SB520-E3/73 (5A), SB520A-E3/54 (5A), and SB520A-E3/73 (5A).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Package	Temp Range [°C]	Product Status
SR1202 B0G	Taiwan Semiconductor Corporation	20	12	550 @ 12A	DO-201AD	-50 ~ 150	Discontinued
SR1202 A0G	Taiwan Semiconductor Corporation	20	12	550 @ 12A	DO-201AD	-50 ~ 150	Active
1N5820-TP	Micro Commercial Co	20	3	475 @ 3A	DO-201AD	-55 ~ 125	Active
SB320-E3/54	Vishay General Semiconductor - Diodes Division	20	3	490 @ 3A	DO-201AD	-65 ~ 150	Active
SB320-E3/73	Vishay General Semiconductor - Diodes Division	20	3	490 @ 3A	DO-201AD	-65 ~ 150	Active
SB520	onsemi	20	5	550 @ 5A	DO-201AD	-55 ~ 150	Obsolete
SB520-E3/54	Vishay General Semiconductor - Diodes Division	20	5	480 @ 5A	DO-201AD	-65 ~ 150	Active
SB520-E3/73	Vishay General Semiconductor - Diodes Division	20	5	480 @ 5A	DO-201AD	-65 ~ 150	Active
SB520A-E3/54	Vishay General Semiconductor - Diodes Division	20	5	500 @ 5A	DO-201AD	-65 ~ 150	Active
SB520A-E3/73	Vishay General Semiconductor - Diodes Division	20	5	500 @ 5A	DO-201AD	-65 ~ 150	Active

Engineering Selection Recommendations

Primary Selection: SR1202 A0G

The SR1202 A0G is the direct equivalent to the SR1202 B0G, manufactured by Taiwan Semiconductor Corporation with identical electrical specifications and current rating of 12A. This part maintains Active product status with 1002 units in stock, ensuring supply continuity. Selection of SR1202 A0G eliminates any current capacity compromise and preserves original design parameters. ROHS3 compliance and unlimited moisture sensitivity rating match the original specification.

Secondary Selection: SB520-E3/54 or SB520-E3/73

For applications where 12A average rectified current exceeds design requirements, the SB520-E3/54 and SB520-E3/73 provide 5A rated alternatives. Both parts are manufactured by Vishay General Semiconductor - Diodes Division with Active product status. The SB520-E3/54 offers 11502 units in stock and the SB520-E3/73 offers 4400 units. Both maintain 20V reverse voltage rating, DO-201AD package format, and ROHS3 compliance. Operating temperature range extends to -65°C, providing enhanced low-temperature performance compared to the original part.

Tertiary Selection: SB520A-E3/54 or SB520A-E3/73

The SB520A variants provide 5A rated alternatives with forward voltage of 500 mV @ 5A, positioned between standard SB520-E3 performance and original SR1202 B0G specifications. Both maintain Active status, ROHS3 compliance, and extended temperature range to -65°C.

Not Recommended: SB520 (onsemi)

The SB520 from onsemi carries Obsolete product status and does not provide supply security equivalent to Active alternatives.

Not Recommended: 1N5820-TP and SB320 Series

The 1N5820-TP, SB320-E3/54, and SB320-E3/73 are rated at 3A average rectified current. Selection of these parts is appropriate only for applications where current requirements do not exceed 3A, as they represent a significant reduction in current capacity from the original 12A specification.

Frequently Asked Questions (FAQ)

Q: Can SR1202 A0G directly replace SR1202 B0G without circuit modification?

A: Yes. The SR1202 A0G is electrically and mechanically identical to the SR1202 B0G. Both parts share identical reverse voltage (20V), average rectified current (12A), forward voltage (550 mV @ 12A), and DO-201AD package format. The only difference is product status (Active vs. Discontinued). No circuit modification is required.

Q: What is the primary difference between the SR1202 B0G and lower-current alternatives like SB520-E3/54?

A: The primary difference is average rectified current capacity. The SR1202 B0G is rated at 12A, while the SB520-E3/54 is rated at 5A. Both maintain identical 20V reverse voltage rating and DO-201AD package format. Selection of lower-current alternatives is appropriate only when application current requirements do not exceed the substitute part rating.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance status, matching the original SR1202 B0G specification.

Q: Do substitute parts maintain the same operating temperature range?

A: No. The original SR1202 B0G operates from -50°C to 150°C. Most substitute parts extend the lower temperature limit to -65°C, providing enhanced cold-temperature performance. The 1N5820-TP operates from -55°C to 125°C, which is narrower at the upper temperature limit.

Q: What is the significance of forward voltage differences between substitute parts?

A: Forward voltage (Vf) affects power dissipation in the diode. The SR1202 B0G specifies 550 mV @ 12A. Substitute parts with lower forward voltage (such as SB520-E3/54 at 480 mV @ 5A) generate less heat at their rated current. However, forward voltage is specified at the part's rated current, not at the original part's current level. Direct comparison requires evaluation at equivalent current levels.

Q: Can SB520-E3/54 (5A) be used in a circuit designed for SR1202 B0G (12A)?

A: The SB520-E3/54 can be used only if the actual circuit current does not exceed 5A. If the circuit requires 12A average rectified current, the SB520-E3/54 will exceed its current rating and may fail. Current capacity must be verified against actual application requirements before substitution.

Q: What is the difference between SB520-E3/54 and SB520A-E3/54?

A: Both parts are rated at 5A average rectified current and 20V reverse voltage in DO-201AD package. The primary difference is forward voltage: SB520-E3/54 specifies 480 mV @ 5A, while SB520A-E3/54 specifies 500 mV @ 5A. Both maintain Active product status and ROHS3 compliance.

Q: Why is the onsemi SB520 listed but not recommended?

A: The onsemi SB520 carries Obsolete product status, which does not provide long-term supply security. Active alternatives such as SB520-E3/54 and SB520-E3/73 from Vishay provide equivalent electrical specifications with confirmed ongoing availability.

Q: Are packaging variants (Cut Tape vs. other formats) electrically equivalent?

A: Yes. Packaging format (Cut Tape, Tape & Reel, or bulk) does not affect electrical performance. Packaging differences relate to supply and handling methods only. The DO-201AD package format remains consistent across all substitute parts.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message