SR503-BP Equivalent & Substitute Parts Reference

Part Overview

The SR503-BP is a Schottky rectifier diode rated for 30 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 this part in active applications require qualified substitute components that maintain electrical and mechanical compatibility while offering current product availability and active manufacturer support.

Substiute Parts

SR503-BP

Micro Commercial CoIn Stock: 757SR503-BP Datasheet

Current PartRFQ

SR1203HB0G

Taiwan Semiconductor CorporationIn Stock: 991SR1203HB0G Datasheet

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SR503 A0G

Taiwan Semiconductor CorporationIn Stock: 768SR503 A0G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SR503-BP is determined by the following critical parameters:

Mandatory Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 30 V minimum
• Package / Case: DO-201AD, Axial (through-hole form factor)
• Technology: Schottky
• Mounting Type: Through Hole
• Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Acceptable Variation Criteria:

• Current - Average Rectified (Io): Equal to or greater than 5 A
• Voltage - Forward (Vf) (Max) @ If: Equal to or less than 550 mV at rated current
• Current - Reverse Leakage @ Vr: Equal to or less than 1 mA @ 30 V
• Operating Temperature - Junction: Must encompass or exceed -50°C to 150°C range

Substitute parts meeting these criteria maintain functional equivalence and direct pin-for-pin compatibility with the SR503-BP in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

SR503 A0G is the primary direct substitute for SR503-BP applications. This part maintains identical electrical ratings at the 5 A current level, matching the forward voltage specification of 550 mV @ 5 A. Both parts share the same reverse voltage rating (30 V), fast recovery speed characteristic, and DO-201AD package form factor. SR503 A0G carries Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring long-term availability and regulatory alignment. The operating temperature range of -55°C to 125°C encompasses the SR503-BP specification of -50°C to 150°C at the lower bound; applications requiring the full upper temperature range of 150°C should evaluate thermal performance in specific circuit conditions.

SR1203HB0G serves as a higher-current alternative for applications where current margin is required. This part doubles the average rectified current rating to 12 A while maintaining the 30 V reverse voltage and 550 mV forward voltage characteristics. SR1203HB0G includes AEC-Q101 automotive qualification and ROHS3 compliance. The reverse leakage current is reduced to 500 µA @ 30 V compared to the SR503-BP specification of 1 mA @ 30 V, representing improved leakage performance. The operating temperature range matches the SR503-BP specification (-50°C to 150°C). SR1203HB0G is appropriate for designs requiring enhanced current capacity or improved leakage characteristics within the same voltage and package envelope.

Both substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the original SR503-BP.

Frequently Asked Questions (FAQ)

Q: Can SR503 A0G directly replace SR503-BP in existing circuit boards?

A: Yes. SR503 A0G provides direct pin-for-pin compatibility in the DO-201AD through-hole package. Electrical parameters at the 5 A operating point are identical, including the 30 V reverse voltage rating and 550 mV forward voltage specification. The part is a functional equivalent suitable for direct substitution.

Q: What is the difference between SR503 A0G and SR1203HB0G?

A: The primary difference is current rating. SR503 A0G is rated for 5 A average rectified current, matching the original SR503-BP specification. SR1203HB0G is rated for 12 A average rectified current, providing 2.4 times the current capacity. Both parts share the same 30 V reverse voltage rating, DO-201AD package, and fast recovery speed characteristic. SR1203HB0G also features lower reverse leakage current (500 µA vs. 1 mA @ 30 V) and includes AEC-Q101 automotive qualification.

Q: Should I use SR1203HB0G if my circuit only requires 5 A?

A: SR1203HB0G is electrically compatible with 5 A applications and provides additional current margin. Selection depends on design priorities. If the circuit operates at or near 5 A continuously, SR503 A0G matches the original specification exactly. If thermal management or reliability margin is a design consideration, SR1203HB0G offers improved performance headroom within the same package footprint.

Q: Are there temperature range differences between the substitute parts?

A: SR503 A0G specifies -55°C to 125°C operating junction temperature, while SR1203HB0G specifies -50°C to 150°C. The original SR503-BP specifies -50°C to 150°C. Applications requiring operation at 125°C to 150°C should use SR1203HB0G or confirm thermal performance with SR503 A0G in the specific circuit design.

Q: Do the substitute parts meet current regulatory requirements?

A: Both SR503 A0G and SR1203HB0G are ROHS3 compliant and REACH Unaffected, meeting current regulatory standards. Both carry Active product status, ensuring ongoing manufacturer support and supply chain availability. The original SR503-BP is classified as "Not For New Designs," making active substitutes necessary for new production and long-term supply security.

Q: What is the significance of the reverse leakage current difference?

A: The original SR503-BP specifies 1 mA reverse leakage @ 30 V. Both substitute parts specify 500 µA @ 30 V, representing 50% lower leakage. Lower reverse leakage improves circuit efficiency and reduces standby power consumption. This is a beneficial characteristic that does not affect compatibility but enhances performance in applications sensitive to leakage current.

Q: Can these parts be used interchangeably in automotive applications?

A: SR1203HB0G carries AEC-Q101 automotive qualification, making it suitable for automotive applications. SR503 A0G does not specify automotive qualification. If automotive qualification is a design requirement, SR1203HB0G is the appropriate selection.