FR504-AP Equivalent & Substitute Parts

Part Overview

The FR504-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 5 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, which necessitates identification of active equivalent components for ongoing design support and procurement continuity. The FR504-AP operates across a junction temperature range of -55°C to 150°C and complies with ROHS3 standards.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	5	A
Voltage - Forward (Vf) (Max) @ If	1.35 @ 5 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	10 @ 400 V	µA
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55 to 150	°C
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—

Substitute Part Grouping Explanation

Substitution of the FR504-AP is determined by electrical and mechanical parameter equivalence. The following criteria establish direct substitutability:

Voltage Rating: DC reverse voltage must equal 400 V maximum
Current Rating: Average rectified current must equal 5 A
Forward Voltage Drop: Maximum forward voltage at rated current must equal 1.35 V @ 5 A
Recovery Characteristics: Reverse recovery time must equal 150 ns; speed classification must match Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Leakage: Maximum reverse leakage current must equal 10 µA @ 400 V
Package: DO-201AD axial through-hole package required
Temperature Range: Operating junction temperature range must span -55°C to 150°C

The FR504GP-AP meets all specified electrical and mechanical parameters and is classified as an active product, making it a direct equivalent for the obsolete FR504-AP.

Parameter Comparison

Parameter	FR504-AP (Main Part)	FR504GP-AP (Substitute)	Match
Manufacturer	Micro Commercial Co	Micro Commercial Co	Yes
Category	Diodes, Rectifiers	Diodes, Rectifiers	Yes
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	Yes
Current - Average Rectified (Io)	5 A	5 A	Yes
Voltage - Forward (Vf) (Max) @ If	1.35 V @ 5 A	1.35 V @ 5 A	Yes
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Yes
Reverse Recovery Time (trr)	150 ns	150 ns	Yes
Current - Reverse Leakage @ Vr	10 µA @ 400 V	10 µA @ 400 V	Yes
Capacitance @ Vr, F	65 pF @ 4V, 1MHz	65 pF @ 4V, 1MHz	Yes
Package / Case	DO-201AD, Axial	DO-201AD, Axial	Yes
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	Yes
Product Status	Obsolete	Active	Different
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Yes

Engineering Selection Recommendations

The FR504GP-AP is the direct equivalent for the obsolete FR504-AP. Both components share identical electrical specifications, package configuration, and compliance certifications. The primary distinction is product status: FR504GP-AP is actively manufactured and supported, while FR504-AP is obsolete.

For new designs and procurement of replacement components, FR504GP-AP is the appropriate selection. Both parts maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity), ensuring compatibility with standard manufacturing and storage environments. The active status of FR504GP-AP provides supply chain continuity and technical support availability.

Frequently Asked Questions (FAQ)

Q: Can FR504GP-AP be used as a direct replacement for FR504-AP in existing circuits?

A: Yes. The FR504GP-AP is electrically and mechanically identical to the FR504-AP. All electrical parameters, including voltage rating, current capacity, forward voltage drop, recovery time, and reverse leakage, are equivalent. The DO-201AD axial package is identical, permitting direct substitution in through-hole applications without circuit modification.

Q: Why is the FR504-AP classified as obsolete?

A: The FR504-AP is no longer in active production. The FR504GP-AP serves as the current active equivalent from the same manufacturer, offering identical performance with ongoing supply availability.

Q: Are there any compliance differences between FR504-AP and FR504GP-AP?

A: No. Both components are ROHS3 compliant and carry MSL Level 1 (unlimited) moisture sensitivity classification. Compliance certifications are equivalent.

Q: What is the significance of the "GP" designation in FR504GP-AP?

A: The "GP" suffix indicates a general-purpose rectifier variant. The electrical and mechanical specifications remain identical to the base FR504 series designation.

Q: Can these diodes be used in high-frequency switching applications?

A: Both FR504-AP and FR504GP-AP are classified as fast recovery diodes with a reverse recovery time of 150 ns and speed rating of Fast Recovery ≤ 500ns, > 200mA (Io). This classification supports switching applications within the specified frequency range determined by the 150 ns recovery time.

Q: What is the maximum junction temperature for these components?

A: The maximum operating junction temperature is 150°C. The minimum operating junction temperature is -55°C, providing a total operating range of 205°C.

Q: Are there inventory considerations when selecting between these parts?

A: FR504-AP inventory is limited to existing stock (1010 Pcs). FR504GP-AP has higher current availability (1164 Pcs) and active production status, making it the preferred choice for ongoing procurement requirements.

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