FR104G Equivalent & Substitute Parts

Part Overview

The FR104G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 400 V DC reverse voltage and 1 A average rectified current in a DO-204AL (DO-41) through-hole axial package. The device is classified as Active product status with fast recovery characteristics (150 ns reverse recovery time) and operates across a junction temperature range of -55°C to 150°C. This diode is suitable for applications requiring fast switching performance in power supply circuits, bridge rectifiers, and general rectification tasks. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative sourcing strategies while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	1.3	V @ 1 A
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	10	pF @ 4V, 1MHz
Operating Temperature - Junction	-55 to 150	°C
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the FR104G are classified into three categories based on electrical and mechanical compatibility:

Parametric Equivalents share identical electrical specifications across all critical parameters: 400 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage drop at 1 A, 150 ns reverse recovery time, 5 µA reverse leakage current at 400 V, and DO-204AL (DO-41) through-hole axial packaging. These parts are direct functional replacements with no performance trade-offs.

Direct Manufacturer Alternatives maintain the same voltage, current, and package specifications but originate from different manufacturers. These parts satisfy the core electrical requirements and mechanical form factor while offering supply chain diversity.

Similar Parts meet the primary voltage and current ratings (400 V, 1 A) and use identical packaging (DO-204AL/DO-41 through-hole axial) but exhibit variations in secondary parameters such as reverse recovery time, forward voltage drop, or reverse leakage current. These parts are functionally compatible for general rectification applications but may exhibit different switching characteristics or thermal performance.

The critical parameters determining substitution eligibility are:

Voltage - DC Reverse (Vr) Maximum: 400 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-204AL, DO-41, Axial
Mounting Type: Through Hole

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	Compliance
FR104G	Taiwan Semiconductor Corporation	400	1	1.3 @ 1A	150	5 @ 400V	DO-204AL (DO-41)	Active	ROHS3
FR104G A0G	Taiwan Semiconductor Corporation	400	1	1.3 @ 1A	150	5 @ 400V	DO-204AL (DO-41)	Active	ROHS3
HER105G	Taiwan Semiconductor Corporation	400	1	1.3 @ 1A	50	5 @ 400V	DO-204AL (DO-41)	Active	ROHS3
SF16GH	Taiwan Semiconductor Corporation	400	1	1.3 @ 1A	35	5 @ 400V	DO-204AL (DO-41)	Active	ROHS3, AEC-Q101
RGP10G	Fairchild Semiconductor	400	1	1.3 @ 1A	150	5 @ 400V	DO-204AL (DO-41)	Active	Vendor Undefined
1N4004-E3/54	Vishay General Semiconductor - Diodes Division	400	1	1.1 @ 1A	>500	5 @ 400V	DO-204AL (DO-41)	Active	ROHS3
1N4004-E3/73	Vishay General Semiconductor - Diodes Division	400	1	1.1 @ 1A	>500	5 @ 400V	DO-204AL (DO-41)	Active	ROHS3
1N4004-G	Comchip Technology	400	1	1.1 @ 1A	>500	5 @ 400V	DO-204AL (DO-41)	Active	ROHS3
1N4004-T	Diodes Incorporated	400	1	1.0 @ 1A	>500	5 @ 400V	DO-204AL (DO-41)	Last Time Buy	ROHS3
1N4004E-E3/54	Vishay General Semiconductor - Diodes Division	400	1	1.1 @ 1A	>500	5 @ 400V	DO-204AL (DO-41)	Active	ROHS3
1N4004G	Rectron USA	400	1	1.0 @ 1A	>500	200 nA @ 400V	DO-204AL (DO-41)	Active	ROHS3, AEC-Q101

Engineering Selection Recommendations

Parametric Equivalent Selection (FR104G A0G, HER105G, SF16GH)

FR104G A0G is a direct parametric equivalent manufactured by Taiwan Semiconductor Corporation with identical electrical specifications and Active product status. This part is the primary choice for direct replacement without any performance variation.

HER105G and SF16GH are parametric equivalents with improved reverse recovery time characteristics (50 ns and 35 ns respectively, compared to 150 ns for FR104G). Both maintain Active product status and ROHS3 compliance. SF16GH carries additional AEC-Q101 automotive qualification, making it suitable for automotive and high-reliability applications. These parts are suitable for applications where faster switching performance is beneficial or required.

Direct Manufacturer Alternative (RGP10G)

RGP10G from Fairchild Semiconductor provides equivalent electrical performance with identical voltage, current, and package specifications. Product status is Active. Compliance information is listed as Vendor Undefined. This part supports supply chain diversification when Taiwan Semiconductor Corporation parts are unavailable.

Similar Parts for General Rectification (1N4004 Series)

The 1N4004 series from multiple manufacturers (Vishay, Comchip Technology, Diodes Incorporated, Rectron USA) meets the core voltage (400 V) and current (1 A) requirements with identical DO-204AL (DO-41) through-hole axial packaging. These parts exhibit standard recovery characteristics (>500 ns reverse recovery time) compared to the fast recovery specification of FR104G. Forward voltage drop ranges from 1.0 V to 1.1 V at 1 A, compared to 1.3 V for FR104G.

1N4004-T from Diodes Incorporated carries Last Time Buy product status, indicating discontinued or end-of-life status. This part should be avoided for new designs or long-term production commitments.

1N4004G from Rectron USA includes AEC-Q101 automotive qualification and exhibits superior reverse leakage characteristics (200 nA at 400 V compared to 5 µA for FR104G), making it suitable for automotive and precision applications.

All 1N4004 variants maintain ROHS3 compliance and Active or Last Time Buy product status. These parts are functionally compatible for standard rectification applications but exhibit slower switching performance than FR104G.

Frequently Asked Questions (FAQ)

Q: Can FR104G A0G be used as a direct replacement for FR104G?

A: Yes. FR104G A0G is a parametric equivalent with identical electrical specifications across all critical parameters: 400 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage drop at 1 A, 150 ns reverse recovery time, and DO-204AL (DO-41) through-hole axial packaging. Both are manufactured by Taiwan Semiconductor Corporation and carry Active product status with ROHS3 compliance.

Q: What is the difference between FR104G and HER105G?

A: Both parts share identical voltage (400 V), current (1 A), forward voltage drop (1.3 V @ 1 A), and packaging (DO-204AL/DO-41). The primary difference is reverse recovery time: HER105G exhibits 50 ns compared to 150 ns for FR104G. This faster recovery characteristic in HER105G reduces switching losses and improves efficiency in high-frequency applications. Capacitance differs slightly (15 pF for HER105G versus 10 pF for FR104G).

Q: Is SF16GH suitable for automotive applications?

A: Yes. SF16GH carries AEC-Q101 automotive qualification and is designated as an automotive-grade component. It maintains the same voltage (400 V), current (1 A), and packaging (DO-204AL/DO-41) as FR104G while offering improved reverse recovery time (35 ns). SF16GH is suitable for automotive power supply circuits, engine control modules, and other automotive rectification applications.

Q: Can 1N4004 series parts replace FR104G?

A: 1N4004 series parts meet the core voltage (400 V) and current (1 A) requirements with identical DO-204AL (DO-41) through-hole axial packaging. However, they exhibit standard recovery characteristics (>500 ns) compared to FR104G's fast recovery (150 ns). Forward voltage drop is lower (1.0–1.1 V versus 1.3 V). These parts are functionally compatible for general rectification applications but exhibit slower switching performance. Selection depends on application-specific switching frequency and efficiency requirements.

Q: What is the significance of reverse recovery time in diode selection?

A: Reverse recovery time (trr) determines how quickly a diode transitions from conducting to blocking state when reverse voltage is applied. FR104G with 150 ns fast recovery is suitable for switching power supplies and high-frequency rectification. HER105G (50 ns) and SF16GH (35 ns) offer faster recovery, reducing switching losses and electromagnetic interference in high-frequency circuits. 1N4004 series parts with >500 ns standard recovery are appropriate for low-frequency or line-frequency rectification where switching speed is not critical.

Q: Are all substitute parts ROHS3 compliant?

A: All parametric equivalents (FR104G A0G, HER105G, SF16GH) and most similar parts (1N4004 series from Vishay, Comchip Technology, Diodes Incorporated, and Rectron USA) are ROHS3 compliant. RGP10G from Fairchild Semiconductor lists compliance information as Vendor Undefined. Verify compliance documentation with the supplier for applications requiring certified ROHS3 compliance.

Q: What packaging options are available for substitute parts?

A: All substitute parts use DO-204AL (DO-41) through-hole axial packaging, identical to FR104G. Packaging variations exist only in distribution format: Cut Tape (CT), Tape & Box (TB), Tape & Reel (TR), or Bulk. These distribution formats do not affect electrical or mechanical compatibility; they reflect supplier packaging and handling methods. Select based on procurement volume and assembly process requirements.

Q: Should I use 1N4004-T for new designs?

A: No. 1N4004-T from Diodes Incorporated carries Last Time Buy product status, indicating the part is discontinued or approaching end-of-life. For new designs and long-term production commitments, select from parts with Active product status: FR104G A0G, HER105G, SF16GH, RGP10G, or active 1N4004 variants from Vishay, Comchip Technology, or Rectron USA.

Q: What is the difference between reverse leakage current specifications?

A: FR104G and most substitute parts specify 5 µA reverse leakage current at 400 V. 1N4004G from Rectron USA exhibits superior leakage characteristics at 200 nA at 400 V, approximately 25 times lower. Lower reverse leakage reduces standby power consumption and heat generation in applications with sustained reverse voltage. Select 1N4004G for precision applications or battery-powered circuits where leakage current is a design constraint.

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