FR503-AP Equivalent & Substitute Parts

Part Overview

The FR503-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 200 V DC reverse voltage and 5 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Active alternatives with identical or compatible electrical and mechanical specifications are available to maintain circuit functionality in applications requiring this diode classification.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	5 A
Voltage - Forward (Vf) (Max) @ If	1.35 V @ 5 A
Reverse Recovery Time (trr)	150 ns
Current - Reverse Leakage @ Vr	10 µA @ 200 V
Package / Case	DO-201AD, Axial
Mounting Type	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the FR503-AP is determined by the following critical parameters: DC reverse voltage rating (200 V), package type (DO-201AD axial through-hole), mounting configuration (through-hole), operating temperature range (-55°C to 150°C), and compliance certifications (ROHS3).

The FR503GP-AP represents a direct equivalent manufactured by the same supplier with identical electrical specifications and active product status. The UG4D-E3/73 from Vishay General Semiconductor qualifies as a similar substitute with matching voltage rating and package, though with reduced current rating (4 A versus 5 A) and improved reverse recovery characteristics.

Parameter Comparison

Parameter	FR503-AP (Main)	FR503GP-AP (Direct Equivalent)	UG4D-E3/73 (Similar Substitute)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Vishay General Semiconductor - Diodes Division
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V
Current - Average Rectified (Io)	5 A	5 A	4 A
Voltage - Forward (Vf) (Max) @ If	1.35 V @ 5 A	1.35 V @ 5 A	950 mV @ 4 A
Reverse Recovery Time (trr)	150 ns	150 ns	30 ns
Current - Reverse Leakage @ Vr	10 µA @ 200 V	10 µA @ 200 V	5 µA @ 200 V
Capacitance @ Vr, F	65 pF @ 4V, 1MHz	65 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Technology	Standard	Standard	Standard

Engineering Selection Recommendations

FR503GP-AP (Direct Equivalent): This part is the primary substitute for the obsolete FR503-AP. It is manufactured by Micro Commercial Co with identical electrical specifications, matching voltage rating, current capacity, forward voltage drop, and reverse recovery time. The FR503GP-AP maintains active product status and ROHS3 compliance, providing direct compatibility for replacement applications without circuit redesign.

UG4D-E3/73 (Similar Substitute): This Vishay component provides functional substitution for applications where the 4 A current rating is acceptable within circuit design margins. The UG4D-E3/73 offers superior reverse recovery characteristics (30 ns versus 150 ns) and lower reverse leakage current (5 µA versus 10 µA), with identical 200 V voltage rating and DO-201AD package configuration. This part is suitable for designs where the reduced current capacity does not exceed application requirements and where improved switching performance is beneficial. Both substitute options maintain ROHS3 compliance and the required operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can FR503GP-AP be used as a direct replacement for FR503-AP?

A: Yes. The FR503GP-AP is manufactured by the same supplier with identical electrical specifications including voltage rating (200 V), current capacity (5 A), forward voltage drop (1.35 V @ 5 A), and reverse recovery time (150 ns). Both use the DO-201AD axial through-hole package. The primary difference is product status: FR503GP-AP is active while FR503-AP is obsolete.

Q: What are the limitations of using UG4D-E3/73 as a substitute?

A: The UG4D-E3/73 has a reduced average rectified current rating of 4 A compared to the FR503-AP's 5 A rating. This part is suitable only for applications where circuit current requirements do not exceed 4 A. The voltage rating (200 V), package type (DO-201AD), and operating temperature range (-55°C to 150°C) are identical, ensuring mechanical and thermal compatibility.

Q: Are all substitute parts in the same package?

A: Yes. The FR503-AP, FR503GP-AP, and UG4D-E3/73 all use the DO-201AD axial through-hole package. This ensures identical mechanical fit and mounting compatibility on printed circuit boards without layout modifications.

Q: Do the substitute parts meet the same compliance requirements?

A: Yes. Both FR503GP-AP and UG4D-E3/73 are ROHS3 compliant and maintain the same operating temperature range (-55°C to 150°C) as the original FR503-AP. Both are classified as standard technology rectifier diodes.

Q: What is the difference in reverse recovery time between the substitutes?

A: The FR503GP-AP maintains the same reverse recovery time as the original part (150 ns). The UG4D-E3/73 offers improved reverse recovery performance at 30 ns, which reduces switching losses in high-frequency applications. This improvement does not affect compatibility but may provide performance benefits in certain circuit topologies.

Q: Can packaging format affect the substitution choice?

A: The FR503GP-AP is supplied in standard packaging, while the UG4D-E3/73 is supplied in Cut Tape (CT) format. Both parts use the identical DO-201AD axial through-hole package case. The supply format does not affect electrical or mechanical compatibility, only procurement and handling procedures.

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