FR104-AP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The FR104-AP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 1 A average rectified current in a DO-41 through-hole package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design and procurement requirements. The FR104-AP features fast recovery characteristics with a reverse recovery time of 150 ns and operates across a junction temperature range of -55°C to 150°C. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) support broad application deployment.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 @ 400 V	µA
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the FR104-AP is determined by strict equivalence across the following critical parameters: DC reverse voltage rating (400 V), average rectified current (1 A), forward voltage drop characteristics, reverse recovery time performance, reverse leakage current, and through-hole mounting compatibility in DO-41 or DO-204AL packages. Parts are grouped into three categories based on substitution relationship:

Direct Manufacturer Equivalent: FR104GP-AP shares identical electrical specifications with the FR104-AP, differing only in product status (active versus obsolete) and packaging format (Tape & Box). This part maintains 400 V, 1 A ratings, 1.3 V forward voltage, and 150 ns reverse recovery time.

Parametric Equivalents: FR104GP-AP, 1N4936GP-AP, 1N4944GP-AP, SF16G-AP, and UF4004GP-AP all meet the 400 V, 1 A electrical requirements with variations in reverse recovery time (35 ns to 200 ns) and capacitance characteristics. These parts are functionally interchangeable within the specified voltage and current envelope.

Similar Parts: 1N4004G R1G (Taiwan Semiconductor Corporation) and MUR240RLG (onsemi) provide 400 V reverse voltage rating but differ in current rating (1N4004G at 1 A, MUR240RLG at 2 A) or recovery speed characteristics. These parts accommodate applications where the primary electrical requirements are met but secondary performance characteristics may vary.

Cross-Manufacturer Equivalents: FR104A-G (Comchip Technology), FR104G A0G (Taiwan Semiconductor Corporation), and HER105G A0G (Taiwan Semiconductor Corporation) provide parametric equivalence across all critical electrical specifications while sourced from alternative manufacturers.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]
FR104-AP	Micro Commercial Co	Obsolete	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-41	-55 to 150
FR104GP-AP	Micro Commercial Co	Active	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-41	-55 to 150
1N4936GP-AP	Micro Commercial Co	Active	400	1	1.2 @ 1 A	200	5 @ 400 V	DO-41	-55 to 150
1N4944GP-AP	Micro Commercial Co	Active	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-41	-55 to 150
SF16G-AP	Micro Commercial Co	Active	400	1	1.3 @ 1 A	35	5 @ 400 V	DO-41	-55 to 150
UF4004GP-AP	Micro Commercial Co	Active	400	1	1.3 @ 1 A	50	5 @ 400 V	DO-41	-55 to 150
1N4004G R1G	Taiwan Semiconductor Corporation	Active	400	1	1 @ 1 A	Standard Recovery	5 @ 400 V	DO-204AL (DO-41)	-55 to 150
MUR240RLG	onsemi	Active	400	2	1.3 @ 2 A	65	5 @ 400 V	Axial	-65 to 175
FR104A-G	Comchip Technology	Active	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-41	-55 to 150
FR104G A0G	Taiwan Semiconductor Corporation	Active	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-204AL (DO-41)	-55 to 150
HER105G A0G	Taiwan Semiconductor Corporation	Active	400	1	1.3 @ 1 A	50	5 @ 400 V	DO-204AL (DO-41)	-55 to 150

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent: FR104GP-AP is the direct active equivalent to the obsolete FR104-AP. This part maintains identical electrical specifications (400 V, 1 A, 1.3 V forward voltage, 150 ns reverse recovery time) and is manufactured by the same supplier (Micro Commercial Co). Product status is active with 774 units in stock. ROHS3 compliance and MSL 1 rating match the original specification. Selection of FR104GP-AP eliminates all substitution risk and provides seamless design continuity.

Secondary Recommendation - Parametric Equivalents from Micro Commercial Co: 1N4944GP-AP, UF4004GP-AP, and SF16G-AP are active parametric equivalents manufactured by Micro Commercial Co. All three parts meet the 400 V, 1 A core requirements with identical forward voltage (1.3 V @ 1 A) and reverse leakage current (5 µA @ 400 V). Reverse recovery time varies: 1N4944GP-AP matches the original 150 ns specification, UF4004GP-AP provides 50 ns, and SF16G-AP provides 35 ns. These parts are suitable for applications where faster recovery characteristics provide performance benefits. All three parts are ROHS3 compliant with active product status.

Cross-Manufacturer Equivalents: FR104A-G (Comchip Technology) and FR104G A0G (Taiwan Semiconductor Corporation) provide parametric equivalence with identical 400 V, 1 A, 1.3 V, and 150 ns specifications. Both parts are ROHS3 compliant and active. FR104G A0G offers higher inventory availability (5396 units) compared to FR104A-G (1007 units). These parts support supply chain diversification and alternative sourcing strategies.

Alternative for Higher Current Applications: MUR240RLG (onsemi) provides 400 V reverse voltage with 2 A average rectified current, supporting applications requiring higher current capacity. This part features 65 ns reverse recovery time and operates across -65°C to 175°C, providing extended temperature range. MUR240RLG is suitable only for designs where 2 A current rating is acceptable and where the axial package format is compatible with board layout.

Standard Recovery Alternative: 1N4004G R1G (Taiwan Semiconductor Corporation) provides 400 V, 1 A specifications with standard recovery characteristics (>500 ns). This part is suitable for applications where fast recovery is not a design requirement and where lower forward voltage (1 V @ 1 A) provides thermal benefits.

Frequently Asked Questions (FAQ)

Q: Can FR104GP-AP directly replace FR104-AP without circuit modification?

A: Yes. FR104GP-AP is the direct active equivalent with identical electrical specifications: 400 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, and 150 ns reverse recovery time. Both parts use DO-41 through-hole packaging and operate across -55°C to 150°C. No circuit modification is required.

Q: What is the difference between FR104-AP and 1N4936GP-AP?

A: Both parts meet 400 V, 1 A core requirements. The primary difference is reverse recovery time: FR104-AP specifies 150 ns while 1N4936GP-AP specifies 200 ns. Additionally, 1N4936GP-AP provides slightly lower forward voltage (1.2 V @ 1 A versus 1.3 V @ 1 A). The 50 ns difference in recovery time may affect switching performance in high-frequency applications but is acceptable for standard rectification circuits.

Q: Are SF16G-AP and UF4004GP-AP suitable replacements for FR104-AP?

A: Both parts meet the 400 V, 1 A electrical requirements and are ROHS3 compliant with active product status. SF16G-AP provides 35 ns reverse recovery time and UF4004GP-AP provides 50 ns, compared to FR104-AP's 150 ns. These faster recovery characteristics reduce switching losses and are beneficial in high-frequency switching applications. Both parts are electrically compatible with FR104-AP in standard rectification circuits.

Q: Can MUR240RLG replace FR104-AP in all applications?

A: MUR240RLG is not a direct replacement. While it provides 400 V reverse voltage and fast recovery characteristics (65 ns), it is rated for 2 A average rectified current compared to FR104-AP's 1 A. MUR240RLG is suitable only for applications where 2 A current capacity is acceptable. Additionally, MUR240RLG uses axial packaging while FR104-AP uses DO-41, requiring board layout verification.

Q: What is the significance of reverse recovery time differences among substitute parts?

A: Reverse recovery time (trr) determines how quickly the diode transitions from forward conduction to reverse blocking. FR104-AP specifies 150 ns. Faster recovery times (SF16G-AP at 35 ns, UF4004GP-AP at 50 ns) reduce switching losses and electromagnetic interference in high-frequency circuits. Slower recovery times (1N4936GP-AP at 200 ns) are acceptable in low-frequency rectification but may increase switching losses. Selection depends on circuit operating frequency and thermal management requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference (FR104GP-AP, 1N4936GP-AP, 1N4944GP-AP, SF16G-AP, UF4004GP-AP, 1N4004G R1G, MUR240RLG, FR104A-G, FR104G A0G, and HER105G A0G) are ROHS3 compliant. All parts also maintain MSL 1 (unlimited moisture sensitivity level) or equivalent, supporting standard handling and storage procedures.

Q: What packaging options are available for FR104-AP substitutes?

A: Most substitute parts use DO-41 or DO-204AL (DO-41 equivalent) through-hole axial packaging, directly compatible with FR104-AP board layouts. MUR240RLG uses axial packaging format, which is mechanically compatible but requires verification of lead spacing and board hole positioning. FR104GP-AP is available in Tape & Box (TB) packaging format, suitable for automated assembly processes.

Q: Which substitute part offers the best inventory availability?

A: FR104G A0G (Taiwan Semiconductor Corporation) offers the highest inventory availability with 5396 units in stock, followed by MUR240RLG (onsemi) with 10400 units. For direct Micro Commercial Co equivalents, SF16G-AP provides 1134 units and FR104GP-AP provides 774 units. Inventory levels support procurement planning and supply chain continuity.

Q: Can FR104A-G (Comchip Technology) be used as a long-term substitute?

A: Yes. FR104A-G provides parametric equivalence with identical 400 V, 1 A, 1.3 V, and 150 ns specifications. The part is manufactured by Comchip Technology (alternative supplier), is ROHS3 compliant, and maintains active product status with 1007 units in stock. FR104A-G supports supply chain diversification and alternative sourcing strategies for long-term design continuity.

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