SR502-AP Equivalent & Substitute Parts

Part Overview

The SR502-AP is a Schottky diode rated for 20 V DC reverse voltage and 5 A average rectified current in a through-hole DO-201AD axial package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Organizations using SR502-AP in active applications require qualified substitute components that maintain electrical and mechanical compatibility while offering current product availability and compliance certifications.

Substiute Parts

SR502-AP

Micro Commercial CoIn Stock: 956SR502-AP Datasheet

Current PartRFQ

1N5820-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 17411N5820-E3/54 Datasheet

SimilarRFQ

SB320-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 8282SB320-E3/54 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SR502-AP is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 20 V
• Package / Case: Must be DO-201AD, Axial
• Mounting Type: Must be Through Hole
• Technology: Must be Schottky
• Speed: Must be Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Criteria:

• Current - Average Rectified (Io): Substitute must support minimum 5 A or be derated for lower current applications
• Voltage - Forward (Vf) (Max) @ If: Must be characterized at comparable current levels
• Current - Reverse Leakage @ Vr: Lower values indicate superior performance
• Operating Temperature - Junction: Must encompass or exceed the SR502-AP range of -50°C ~ 150°C

The identified substitute parts (1N5820-E3/54 and SB320-E3/54) share identical voltage ratings, package geometry, and mounting configuration. Both are rated for 3 A average rectified current, which represents a current derating from the original 5 A specification. This derating requires circuit-level evaluation to confirm suitability for the intended application.

Parameter Comparison

Engineering Selection Recommendations

1N5820-E3/54 Selection Criteria:

• Active product status with current manufacturing support
• ROHS3 compliant for regulatory compliance in restricted substance applications
• Operating temperature range of -65°C ~ 125°C provides extended low-temperature performance but does not reach the upper 150°C limit of SR502-AP
• Current rating of 3 A requires derating analysis for applications originally specified at 5 A
• Forward voltage of 475 mV @ 3 A indicates lower conduction losses compared to SR502-AP at equivalent current levels

SB320-E3/54 Selection Criteria:

• Active product status with current manufacturing support
• ROHS3 compliant for regulatory compliance in restricted substance applications
• Operating temperature range of -65°C ~ 150°C fully encompasses the SR502-AP temperature envelope
• Current rating of 3 A requires derating analysis for applications originally specified at 5 A
• Reverse leakage current of 500 µA @ 20 V is superior to SR502-AP at 1 mA @ 20 V, indicating lower junction leakage
• Forward voltage of 490 mV @ 3 A represents intermediate performance between SR502-AP and 1N5820-E3/54

Compliance Considerations: Both substitute parts carry REACH Unaffected status, matching the SR502-AP designation. Both are ROHS3 compliant, providing regulatory advantage over the original component. The SB320-E3/54 offers superior temperature range coverage and lower reverse leakage characteristics, making it the preferred substitute when thermal performance and leakage minimization are design priorities.

Frequently Asked Questions (FAQ)

Q: Can 1N5820-E3/54 or SB320-E3/54 directly replace SR502-AP in all applications?

A: Direct replacement requires circuit-level evaluation. Both substitutes are rated for 3 A average rectified current versus the SR502-AP specification of 5 A. Applications operating at or near 5 A must be reassessed to confirm operation within the 3 A rating of the substitute parts. Voltage ratings, package geometry, and mounting configuration are identical, permitting mechanical and electrical interface compatibility.

Q: What is the significance of the current rating difference between SR502-AP (5 A) and the substitute parts (3 A)?

A: The current rating represents the maximum average rectified current the diode can conduct continuously within specified thermal and electrical limits. A 3 A rated device operating at 5 A will exceed junction temperature limits and reduce component reliability. Applications must either operate at reduced current levels or employ thermal management techniques such as heat sinking to maintain junction temperature within the -65°C ~ 125°C or -65°C ~ 150°C operating range.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) determines the voltage drop across the diode during conduction. SR502-AP specifies 550 mV @ 5 A, while 1N5820-E3/54 specifies 475 mV @ 3 A and SB320-E3/54 specifies 490 mV @ 3 A. Lower forward voltage reduces power dissipation and heat generation. Comparison at equivalent current levels is necessary; the substitute parts are characterized at 3 A, not 5 A, making direct voltage comparison inappropriate without current normalization.

Q: Why does SB320-E3/54 have lower reverse leakage current than SR502-AP?

A: Reverse leakage current (Ir) is a temperature-dependent parameter reflecting minority carrier diffusion across the reverse-biased junction. SB320-E3/54 specifies 500 µA @ 20 V compared to SR502-AP at 1 mA @ 20 V. Lower leakage indicates superior junction quality or different semiconductor processing. This characteristic benefits applications sensitive to standby current or requiring minimal off-state power consumption.

Q: Is the operating temperature range difference between substitutes significant?

A: 1N5820-E3/54 operates from -65°C ~ 125°C, while SB320-E3/54 operates from -65°C ~ 150°C. The SR502-AP range is -50°C ~ 150°C. SB320-E3/54 fully encompasses the SR502-AP upper temperature limit of 150°C, while 1N5820-E3/54 does not. Applications requiring sustained operation at temperatures above 125°C must use SB320-E3/54 or accept thermal derating of 1N5820-E3/54.

Q: What packaging differences exist between SR502-AP and the substitute parts?

A: All three components use identical DO-201AD axial through-hole packaging. SR502-AP is supplied in Bulk packaging, while 1N5820-E3/54 and SB320-E3/54 are supplied in Cut Tape (CT) packaging. Packaging format affects handling, storage, and automated assembly compatibility but does not alter electrical or mechanical interface characteristics.

Q: Are both substitute parts ROHS3 compliant?

A: Yes. Both 1N5820-E3/54 and SB320-E3/54 carry ROHS3 Compliant designation, indicating compliance with Restriction of Hazardous Substances Directive 3. This provides regulatory advantage for applications subject to ROHS requirements. SR502-AP does not specify RoHS status.