FR204 Equivalent & Substitute Parts

Part Overview

The FR204 is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 2 A average rectified current in a DO-15 through-hole package. Manufactured by SMC Diode Solutions, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure ongoing component availability for production and repair applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 2 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-65°C ~ 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the FR204 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 2 A minimum
Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, or Axial equivalent
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Reverse Recovery Time (trr): 150 ns or lower
Current - Reverse Leakage @ Vr: 5 µA @ 400 V or lower
Operating Temperature Range: Must encompass application requirements

Substitute parts are grouped into two categories:

Direct Equivalent (Identical Electrical Ratings): FR204G meets all primary and secondary criteria with identical voltage, current, and speed specifications. This part is from an active manufacturer and is the preferred direct replacement.

Similar Equivalent (Reduced Current Rating): Parts 1N5395G B0G and 1N5395GHA0G are rated for 1.5 A average rectified current, which is lower than the FR204's 2 A rating. These parts are suitable only for applications where the actual circuit current demand does not exceed 1.5 A. The 1N5395GHA0G variant includes automotive-grade qualification (AEC-Q101).

Similar Equivalent (Enhanced Performance): SF2L6G B0G is rated for 2 A average rectified current with improved reverse recovery time (35 ns versus 150 ns) and lower reverse leakage current (1 µA versus 5 µA). This part offers superior performance characteristics while maintaining the same voltage and current ratings.

Parameter Comparison

Parameter	FR204	FR204G	1N5395G B0G	1N5395GHA0G	SF2L6G B0G
Manufacturer	SMC Diode Solutions	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	2 A	2 A	1.5 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 2 A	1.3 V @ 2 A	1 V @ 1.5 A	1 V @ 1.5 A	1.3 V @ 2 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	150 ns	150 ns	Not specified	Not specified	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	1 µA @ 400 V
Capacitance @ Vr, F	30pF @ 4V, 1MHz	10pF @ 4V, 1MHz	15pF @ 4V, 1MHz	15pF @ 4V, 1MHz	20pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-65°C ~ 125°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	Not specified	Not specified	Not specified	AEC-Q101 Qualified	Not specified

Engineering Selection Recommendations

FR204G (Direct Equivalent - Preferred Selection)

The FR204G from Taiwan Semiconductor Corporation is the primary substitute for the FR204. This part maintains identical electrical specifications: 400 V reverse voltage, 2 A average rectified current, fast recovery speed classification, and 150 ns reverse recovery time. The FR204G is manufactured by an active supplier, carries ROHS3 compliance, and is available in production quantities. The forward voltage specification increases marginally from 1.2 V to 1.3 V at 2 A, which is within acceptable tolerance for general-purpose rectifier applications. The operating temperature range extends to 150°C, providing improved thermal margin compared to the FR204's 125°C maximum.

SF2L6G B0G (Enhanced Performance Alternative)

The SF2L6G B0G is suitable for applications requiring superior switching performance. This part maintains the 400 V voltage and 2 A current ratings while offering significantly improved reverse recovery time (35 ns versus 150 ns) and reduced reverse leakage current (1 µA versus 5 µA). Selection of this part is appropriate for high-frequency switching applications or circuits sensitive to reverse recovery losses. The part is ROHS3 compliant and available from an active manufacturer.

1N5395G B0G and 1N5395GHA0G (Reduced Current Applications)

These parts are suitable only for applications where the actual circuit current does not exceed 1.5 A. The 1N5395GHA0G variant includes AEC-Q101 automotive qualification and is appropriate for automotive applications operating within the 1.5 A current limit. Both parts are ROHS3 compliant and available from active manufacturers. The 1N5395GHA0G is the preferred selection for automotive applications due to its formal qualification status.

Frequently Asked Questions (FAQ)

Q: Can FR204G be used as a direct replacement for FR204 in all applications?

A: Yes, FR204G is a direct electrical equivalent with identical voltage (400 V), current (2 A), and speed (fast recovery ≤ 500ns) specifications. The forward voltage increases from 1.2 V to 1.3 V at 2 A, which is negligible for general-purpose rectifier circuits. The extended operating temperature range (-55°C to 150°C versus -65°C to 125°C) provides additional thermal margin. FR204G is the recommended direct replacement.

Q: What is the difference between FR204G and SF2L6G B0G?

A: Both parts are rated for 400 V and 2 A. The SF2L6G B0G offers superior performance with reverse recovery time of 35 ns (versus 150 ns) and reverse leakage current of 1 µA (versus 5 µA). The SF2L6G B0G is appropriate for high-frequency switching applications where reverse recovery losses impact circuit efficiency. For standard rectification applications, FR204G is the preferred choice due to cost and performance alignment with the original FR204 specification.

Q: Can 1N5395G B0G or 1N5395GHA0G replace FR204 in my circuit?

A: These parts are suitable only if your circuit operates at 1.5 A or lower average rectified current. Both parts are rated for 400 V reverse voltage and feature the same through-hole DO-15 package. However, the 1.5 A current rating is lower than the FR204's 2 A rating. If your circuit requires the full 2 A capability, use FR204G or SF2L6G B0G instead. The 1N5395GHA0G is qualified for automotive applications (AEC-Q101).

Q: Are all substitute parts available in the same package?

A: Yes, all substitute parts are available in the DO-204AC, DO-15, axial through-hole package. Physical dimensions and lead spacing are compatible with the original FR204 package, allowing direct board-level substitution without layout modifications.

Q: What is the significance of the fast recovery speed classification?

A: Fast recovery speed (≤ 500ns, > 200mA) indicates the diode switches quickly from forward to reverse bias. This specification is critical for switching power supplies and high-frequency rectification circuits. The FR204, FR204G, and SF2L6G B0G all meet this specification. The 1N5395 series uses standard recovery (>500ns), which is suitable for line-frequency rectification but not for high-frequency applications.

Q: Is the 1N5395GHA0G suitable for automotive applications?

A: Yes, the 1N5395GHA0G carries AEC-Q101 automotive qualification. This part is suitable for automotive applications operating within the 1.5 A current limit and -55°C to 150°C temperature range. If your automotive application requires 2 A capability, neither 1N5395 variant is appropriate; use FR204G or SF2L6G B0G instead.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials in electrical and electronic equipment. All substitute parts listed are ROHS3 compliant. The original FR204 compliance status is not specified.

Q: How do I determine which substitute part is best for my application?

A: Verify three critical parameters: (1) Required reverse voltage (all substitutes support 400 V minimum), (2) Required average rectified current (FR204G and SF2L6G B0G support 2 A; 1N5395 variants support 1.5 A), and (3) Operating frequency (fast recovery parts for high-frequency; standard recovery acceptable for line-frequency). If your application requires 2 A at fast recovery speed, use FR204G. If high-frequency performance is critical, use SF2L6G B0G. If current is limited to 1.5 A and automotive qualification is required, use 1N5395GHA0G.

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