FR204G Equivalent & Substitute Parts

Part Overview

The FR204G is a general-purpose rectifier diode manufactured by SMC Diode Solutions, rated for 400 V DC reverse voltage and 2 A average rectified current in a through-hole DO-15 package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility to ensure functional interchangeability in circuit applications requiring fast recovery rectification at the specified voltage and current ratings.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 2 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 µA @ 280 V	µA
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FR204G is determined by strict equivalence of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 2 A minimum
Voltage - Forward (Vf) (Max) @ If: 1.3 V or lower at 2 A
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Through Hole
Package / Case: DO-204AC or DO-15 (Axial)
Operating Temperature - Junction: -55°C to 150°C minimum range

Identified Substitute: The SF26G A0G manufactured by Taiwan Semiconductor Corporation meets all primary substitution criteria. Both components share identical voltage ratings, current ratings, forward voltage characteristics, and operating temperature range. Both are classified as fast recovery diodes with through-hole axial mounting in DO-15 package format. Compliance certifications (ROHS3, EAR99, HTSUS code) are equivalent between the two parts.

Parameter Comparison

Parameter	FR204G (SMC)	SF26G A0G (Taiwan Semiconductor)	Match Status
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	Equivalent
Current - Average Rectified (Io)	2 A	2 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 2 A	1.3 V @ 2 A	Equivalent
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Reverse Recovery Time (trr)	150 ns	35 ns	SF26G A0G Superior
Current - Reverse Leakage @ Vr	5 µA @ 280 V	5 µA @ 400 V	SF26G A0G Superior
Capacitance @ Vr, F	40 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz	SF26G A0G Superior
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	Equivalent
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

FR204G (SMC Diode Solutions):

Active product status with 1035 units in stock
ROHS3 compliant and REACH affected
Suitable for applications requiring standard fast recovery rectification at 400 V / 2 A
Established supply availability

SF26G A0G (Taiwan Semiconductor Corporation):

Active product status with 831 units in stock
ROHS3 compliant and REACH unaffected
Demonstrates superior performance characteristics: 35 ns reverse recovery time (versus 150 ns), lower capacitance (20 pF versus 40 pF), and reverse leakage measured at higher voltage (400 V versus 280 V)
Functionally interchangeable with FR204G for all specified electrical and mechanical parameters
Suitable for applications where reduced reverse recovery time and lower capacitance provide performance advantages

Both parts meet identical substitution criteria and are suitable for direct replacement in through-hole circuit board applications. Selection between FR204G and SF26G A0G depends on supply availability, lead time requirements, and application-specific performance priorities.

Frequently Asked Questions (FAQ)

Q: Can SF26G A0G directly replace FR204G in existing circuit designs?

A: Yes. Both components share identical voltage ratings (400 V), current ratings (2 A), forward voltage characteristics (1.3 V @ 2 A), and operating temperature range (-55°C to 150°C). Both are fast recovery diodes in DO-15 through-hole axial packages. Direct substitution is electrically and mechanically compatible.

Q: What are the key differences between FR204G and SF26G A0G?

A: The primary differences are reverse recovery time (FR204G: 150 ns; SF26G A0G: 35 ns), junction capacitance (FR204G: 40 pF; SF26G A0G: 20 pF), and reverse leakage measurement voltage (FR204G: 5 µA @ 280 V; SF26G A0G: 5 µA @ 400 V). SF26G A0G exhibits superior performance in these secondary parameters while maintaining full electrical equivalence for primary specifications.

Q: Are both parts ROHS3 compliant?

A: Yes. Both FR204G and SF26G A0G are ROHS3 compliant. SF26G A0G carries REACH unaffected status, while FR204G is REACH affected. Both share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Q: What is the moisture sensitivity level for these diodes?

A: Both FR204G and SF26G A0G are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

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

A: Both components meet fast recovery specifications (≤ 500ns, > 200mA). SF26G A0G provides faster reverse recovery time (35 ns versus 150 ns) and lower capacitance (20 pF versus 40 pF), which may provide performance advantages in high-frequency switching circuits. However, both parts are electrically qualified for the specified 400 V / 2 A fast recovery classification.

Q: What packaging formats are available?

A: FR204G is supplied in Tape & Box (TB) packaging. SF26G A0G is supplied in Cut Tape (CT) packaging. Both components use identical DO-15 axial through-hole package format suitable for PCB insertion and wave soldering processes.

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