SR802 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR802 is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 20V DC reverse voltage and 8A average rectified current in a DO-201AD axial through-hole package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	8	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 8 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	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SR802 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 20V minimum
Package / Case: DO-201AD, Axial (mechanical compatibility)
Mounting Type: Through Hole
Technology: Schottky
RoHS Status: ROHS3 Compliant

Current Rating Consideration: The SR802 is rated for 8A average rectified current. Substitute parts with lower current ratings (such as 5A) operate within the same voltage class and package but with reduced current capacity. Such substitutes are electrically compatible for applications requiring current levels at or below the substitute's rating.

Forward Voltage Compatibility: Forward voltage drop (Vf) at rated current must not exceed the application's thermal and efficiency requirements. The SR802 specifies 550 mV @ 8A; substitutes with identical or lower Vf at their respective current ratings maintain thermal performance parity.

Parameter Comparison

Parameter	SR802 (Main Part)	SB520 (Substitute)	Match Status
Manufacturer	Taiwan Semiconductor Corporation	onsemi	Different Manufacturer
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	Equivalent
Current - Average Rectified (Io)	8 A	5 A	Substitute Rated Lower
Voltage - Forward (Vf) (Max) @ If	550 mV @ 8 A	550 mV @ 5 A	Equivalent at Respective Ratings
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	500 µA @ 20 V	500 µA @ 20 V	Equivalent
Package / Case	DO-201AD, Axial	DO-201AD, Axial	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Operating Temperature - Junction	-55 to 125 °C	-55 to 150 °C	Substitute Range Extended
Technology	Schottky	Schottky	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Active	Obsolete	Main Part Preferred

Engineering Selection Recommendations

Primary Selection: SR802 The SR802 maintains Active product status with full availability (716 Pcs in stock). This part is the preferred choice for new designs and production applications requiring 8A rectified current capacity at 20V reverse voltage in DO-201AD package format.

Substitute Selection: SB520 The SB520 (onsemi) is electrically compatible for applications where the required average rectified current does not exceed 5A. Both parts share identical reverse voltage rating (20V), forward voltage characteristics (550 mV), fast recovery speed, and reverse leakage specifications. The SB520 offers extended operating temperature range (-55 to 150°C versus -55 to 125°C). However, the SB520 carries Obsolete product status, indicating limited future availability. The SB520 is suitable only for legacy system maintenance or applications with current requirements below 5A.

Compliance Basis: Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for equivalent substitution in compliant applications.

Frequently Asked Questions (FAQ)

Q: Can the SB520 directly replace the SR802 in all applications? A: The SB520 is mechanically and electrically compatible for applications requiring average rectified current at or below 5A. Applications requiring the full 8A capacity of the SR802 cannot use the SB520 as a direct substitute.

Q: What is the primary difference between SR802 and SB520? A: The primary difference is current rating: SR802 is rated for 8A while SB520 is rated for 5A. Both maintain identical 20V reverse voltage, 550 mV forward voltage drop, and DO-201AD package specifications.

Q: Why is the SB520 listed as Obsolete? A: Obsolete product status indicates the manufacturer has discontinued active production. The SB520 remains available through existing inventory but future availability is not guaranteed. The SR802 (Active status) is recommended for new designs.

Q: Are there any thermal performance differences between these parts? A: The SB520 supports an extended operating temperature range (-55 to 150°C) compared to the SR802 (-55 to 125°C). Forward voltage drop is identical at their respective current ratings (550 mV), ensuring equivalent thermal performance within each part's rated current capacity.

Q: Can I use the SR802 in place of the SB520? A: Yes. The SR802 is a higher-capacity variant (8A versus 5A) and is fully compatible with applications designed for the SB520, provided the application's thermal design accommodates the SR802's specifications.

Q: Are both parts RoHS compliant? A: Yes. Both SR802 and SB520 are ROHS3 compliant and REACH Unaffected, meeting regulatory requirements for equivalent substitution in compliant applications.

Q: What is the significance of the DO-201AD package? A: DO-201AD is an axial through-hole package format. Both parts use identical packaging, ensuring mechanical compatibility for PCB mounting and circuit board layout without modification.

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