FR306 Equivalent & Substitute Parts

Part Overview

The FR306 is a general-purpose rectifier diode rated for 800 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The FR306 operates across a junction temperature range of -65°C to 150°C and features fast recovery characteristics with a reverse recovery time of 500 ns, suitable for standard rectification applications requiring moderate voltage and current ratings.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 3 A	V
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5 @ 800 V	µA
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Standard	—
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—

Substitute Part Grouping Explanation

Substitution of the FR306 is determined by strict equivalence across the following critical parameters:

Voltage Rating: DC reverse voltage must equal 800 V maximum
Current Rating: Average rectified current must equal 3 A
Forward Voltage Drop: Maximum forward voltage at rated current must equal 1.3 V @ 3 A
Recovery Characteristics: Reverse recovery time must equal 500 ns with fast recovery classification
Reverse Leakage: Maximum reverse leakage current must equal 5 µA @ 800 V
Package Type: DO-201AD axial through-hole package required for mechanical and thermal compatibility
Mounting Configuration: Through-hole mounting only

The FR306G qualifies as a direct substitute based on matching all electrical parameters and package specifications. Additional cross-reference parts (1N5407-E3/73, GP30K-E3/54, 1N5407-E3/54) are listed as secondary equivalents through the FR306G manufacturer's documentation.

Parameter Comparison

Parameter	FR306 (Main)	FR306G (Substitute)	Unit
Manufacturer	SMC Diode Solutions	Taiwan Semiconductor Corporation	—
Product Status	Obsolete	Active	—
Voltage - DC Reverse (Vr) (Max)	800	800	V
Current - Average Rectified (Io)	3	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 3 A	1.3 @ 3 A	V
Reverse Recovery Time (trr)	500	500	ns
Current - Reverse Leakage @ Vr	5 @ 800 V	5 @ 800 V	µA
Capacitance @ Vr, F	60 @ 4V, 1MHz	30 @ 4V, 1MHz	pF
Mounting Type	Through Hole	Through Hole	—
Package / Case	DO-201AD, Axial	DO-201AD, Axial	—
Operating Temperature - Junction	-65 to 150	-55 to 150	°C
Technology	Standard	Standard	—
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	—
RoHS Status	Not specified	ROHS3 Compliant	—
Packaging Format	Not specified	Cut Tape (CT)	—

Engineering Selection Recommendations

The FR306G is the primary substitute for the obsolete FR306. Both components share identical electrical specifications across voltage, current, forward voltage drop, and recovery time parameters. The FR306G is manufactured by Taiwan Semiconductor Corporation and maintains active product status, ensuring ongoing availability and supply chain continuity.

The FR306G demonstrates improved compliance posture with ROHS3 certification, whereas the original FR306 compliance status is not specified. Both components carry REACH Unaffected status and EAR99 export classification.

A minor difference exists in junction temperature operating range: the FR306 operates from -65°C to 150°C, while the FR306G operates from -55°C to 150°C. This represents a 10°C reduction in the lower temperature limit. For applications requiring operation below -55°C, the original FR306 specification must be maintained.

Capacitance at rated voltage shows a difference: FR306 exhibits 60 pF @ 4V, 1MHz, while FR306G exhibits 30 pF @ 4V, 1MHz. This lower capacitance in the FR306G may provide improved high-frequency performance characteristics in switching applications.

Frequently Asked Questions (FAQ)

Q: Can FR306G be used as a direct replacement for FR306 in all applications?

A: The FR306G qualifies as a direct electrical substitute for the FR306 across all primary rectification parameters: 800 V reverse voltage, 3 A current rating, 1.3 V forward voltage drop, and 500 ns recovery time. The primary consideration is the reduced lower junction temperature limit (-55°C versus -65°C). Applications operating below -55°C require retention of the original FR306 specification.

Q: What is the significance of the capacitance difference between FR306 and FR306G?

A: The FR306G exhibits lower junction capacitance (30 pF versus 60 pF at 4V, 1MHz). This parameter affects high-frequency switching behavior and reverse recovery characteristics. For applications sensitive to switching transients or operating at elevated frequencies, the lower capacitance of FR306G may provide performance benefits.

Q: Are there packaging differences between FR306 and FR306G?

A: Both components use the DO-201AD axial through-hole package. The FR306G is supplied in Cut Tape (CT) format, while the original FR306 packaging format is not specified. Both packages are mechanically and thermally compatible for PCB mounting.

Q: What compliance certifications apply to FR306G?

A: The FR306G carries ROHS3 compliance certification and REACH Unaffected status. Both components share EAR99 export classification and identical HTSUS tariff codes (8541.10.0080). The FR306G represents improved regulatory compliance for new designs.

Q: Are secondary cross-reference parts (1N5407-E3/73, GP30K-E3/54, 1N5407-E3/54) suitable substitutes?

A: These parts are listed as secondary equivalents through FR306G manufacturer documentation. Direct substitution suitability requires verification against the specific electrical and mechanical parameters of each application circuit.

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