FR307 Equivalent & Substitute Parts

Part Overview

The FR307 is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This diode is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The FR307 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.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	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 @ 1000 V	µA
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitute parts for the FR307 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 1000 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-201AD, Axial
Mounting Type: Through Hole

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Within component design tolerances
Reverse Recovery Time (trr): Fast recovery (≤500 ns) or standard recovery (>500 ns)
Current - Reverse Leakage @ Vr: Consistent at 5 µA @ 1000 V
Capacitance @ Vr, F: Variation acceptable within diode specifications
Operating Temperature - Junction: Minimum -55°C acceptable for most applications requiring -65°C

The FR307G (Taiwan Semiconductor Corporation) and 1N5408GP-TP (Micro Commercial Co) meet the critical matching parameters and are classified as direct or similar substitutes.

Parameter Comparison

Parameter	FR307 (Main)	FR307G (Direct)	1N5408GP-TP (Similar)	Unit
Manufacturer	SMC Diode Solutions	Taiwan Semiconductor Corporation	Micro Commercial Co	—
Product Status	Obsolete	Active	Active	—
Voltage - DC Reverse (Vr) (Max)	1000	1000	1000	V
Current - Average Rectified (Io)	3	3	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 3 A	1.3 @ 3 A	1.1 @ 3 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	500	500	Not specified	ns
Current - Reverse Leakage @ Vr	5 @ 1000 V	5 @ 1000 V	5 @ 1000 V	µA
Capacitance @ Vr, F	60 @ 4V, 1MHz	30 @ 4V, 1MHz	40 @ 4V, 1MHz	pF
Package / Case	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	—
Mounting Type	Through Hole	Through Hole	Through Hole	—
Operating Temperature - Junction	-65 to 150	-55 to 150	-55 to 150	°C
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

FR307G (Taiwan Semiconductor Corporation): The FR307G is classified as a direct substitute. It maintains identical electrical specifications for voltage, current, and recovery characteristics. The FR307G is an active product with ROHS3 compliance, providing long-term availability and regulatory alignment. The operating temperature minimum of -55°C is suitable for applications not requiring the extended -65°C lower limit of the original FR307. Capacitance is lower at 30 pF compared to 60 pF in the FR307, which may provide advantages in high-frequency switching applications.

1N5408GP-TP (Micro Commercial Co): The 1N5408GP-TP is classified as a similar substitute. It meets the critical voltage and current specifications and shares the DO-201AD package. This part features standard recovery characteristics (>500 ns) compared to the fast recovery (≤500 ns) of the FR307. The forward voltage is lower at 1.1 V versus 1.3 V, resulting in reduced power dissipation. The 1N5408GP-TP is an active product with ROHS3 compliance. Selection of this part is appropriate for applications where standard recovery speed is acceptable and lower forward voltage drop is beneficial.

Frequently Asked Questions (FAQ)

Q: Can the FR307G directly replace the FR307 in all applications?

A: The FR307G meets all critical electrical parameters (1000 V, 3 A, fast recovery) and uses the same DO-201AD package. The operating temperature range differs at the lower limit (-55°C versus -65°C). Direct replacement is appropriate for applications operating above -55°C junction temperature.

Q: What is the difference between the FR307G and 1N5408GP-TP?

A: Both parts share the same voltage and current ratings and package. The FR307G maintains fast recovery characteristics (500 ns) matching the original FR307. The 1N5408GP-TP uses standard recovery (>500 ns) and has a lower forward voltage (1.1 V versus 1.3 V). Selection depends on whether fast recovery speed is required for the application.

Q: Are there compliance or regulatory differences between these substitutes?

A: Both the FR307G and 1N5408GP-TP are ROHS3 compliant and REACH unaffected. The original FR307 does not specify RoHS status. Both substitutes are suitable for applications requiring modern regulatory compliance.

Q: Does the capacitance difference between parts affect circuit performance?

A: The FR307 specifies 60 pF, the FR307G specifies 30 pF, and the 1N5408GP-TP specifies 40 pF at 4 V and 1 MHz. Lower capacitance in the FR307G may reduce switching losses in high-frequency applications. Capacitance differences are within normal diode specification ranges and do not prevent substitution in standard rectification circuits.

Q: Can I use the 1N5408GP-TP in a circuit designed for fast recovery diodes?

A: The 1N5408GP-TP uses standard recovery (>500 ns) versus the fast recovery (≤500 ns) of the FR307. In applications where fast recovery is critical for circuit timing or efficiency, the 1N5408GP-TP may not be suitable. The FR307G is the appropriate choice for fast recovery requirements.

Q: What is the inventory status of these substitutes?

A: The FR307G has 4640 pieces in stock. The 1N5408GP-TP has 2792 pieces in stock. Both are active products with ongoing availability.

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