FR307-T Equivalent & Substitute Parts

Part Overview

The FR307-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 1000 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This device features fast recovery characteristics with a reverse recovery time of 500 ns and operates across a junction temperature range of -65°C to 175°C. The FR307-T is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging and technology options.

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 V @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	10	µA @ 1000 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FR307-T is determined by strict equivalence across the following critical parameters:

Mandatory Electrical Equivalence:

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

Technology Considerations: Substitute parts are grouped into two technology categories:

Standard Recovery Diodes (>500 ns): Parts with reverse recovery time exceeding 500 ns. These represent the majority of available substitutes and are electrically compatible with the FR307-T despite differing recovery speed classifications.
Fast Recovery Diodes (≤500 ns): Parts with reverse recovery time of 500 ns or less, matching the FR307-T's fast recovery specification. These include both standard technology and avalanche technology variants.

Compliance and Status: All substitute parts listed maintain ROHS3 compliance and active or not-for-new-designs product status. Reverse leakage current specifications range from 5 µA to 10 µA at 1000 V, all within acceptable operational limits for general-purpose rectification applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed Classification	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
FR307-T	Diodes Incorporated	1000	3	1.3 @ 3 A	Fast Recovery ≤ 500ns	500	10 @ 1000 V	DO-201AD	-65 to 175	Obsolete
1N5408-E3/54	Vishay General Semiconductor	1000	3	1.2 @ 3 A	Standard Recovery >500ns	—	5 @ 1000 V	DO-201AD	-50 to 150	Active
1N5408-G	Comchip Technology	1000	3	0.95 @ 3 A	Standard Recovery >500ns	—	5 @ 1000 V	DO-201AD	-65 to 125	Active
1N5408G	Taiwan Semiconductor Corporation	1000	3	1.0 @ 3 A	Standard Recovery >500ns	—	5 @ 1000 V	DO-201AD	-55 to 150	Active
1N5408GP-AP	Micro Commercial Co	1000	3	1.1 @ 3 A	Standard Recovery >500ns	—	5 @ 1000 V	DO-201AD	-55 to 150	Active
1N5408GP-TP	Micro Commercial Co	1000	3	1.1 @ 3 A	Standard Recovery >500ns	—	5 @ 1000 V	DO-201AD	-55 to 150	Active
1N5408RLG	onsemi	1000	3	1.0 @ 3 A	Standard Recovery >500ns	—	10 @ 1000 V	DO-201AA, DO-27	-65 to 150	Not For New Designs
BYT56M-TR	Vishay General Semiconductor	1000	3	1.4 @ 3 A	Fast Recovery ≤ 500ns	100	5 @ 1000 V	SOD-64	-55 to 175	Active
BYT78-TR	Vishay General Semiconductor	1000	3	1.2 @ 3 A	Fast Recovery ≤ 500ns	250	5 @ 1000 V	SOD-64	-55 to 175	Active
FR307GP-AP	Micro Commercial Co	1000	3	1.3 @ 3 A	Fast Recovery ≤ 500ns	500	5 @ 1000 V	DO-201AD	-55 to 150	Active
60S10-TP	Micro Commercial Co	1000	6	1.0 @ 6 A	Standard Recovery >500ns	—	5 @ 1000 V	DO-201AD	-55 to 150	Active

Engineering Selection Recommendations

Primary Substitutes (Electrical and Package Equivalence):

The following parts provide direct electrical and mechanical substitution for the FR307-T with active product status and full compliance certifications:

1N5408GP-TP (Micro Commercial Co): Maintains identical voltage and current ratings in DO-201AD package with active status. Standard recovery technology. Cut Tape packaging available.
1N5408G (Taiwan Semiconductor Corporation): Meets all electrical requirements with lowest forward voltage (0.95 V @ 3 A). Highest inventory availability (38,100 pcs). Active status.
FR307GP-AP (Micro Commercial Co): Exact electrical match including fast recovery specification (500 ns trr). Same base part number family. Active status.

Secondary Substitutes (Voltage and Current Equivalence with Technology Variation):

1N5408-E3/54 (Vishay General Semiconductor): Standard recovery variant with reduced forward voltage (1.2 V @ 3 A). Active status. Suitable where recovery speed is not critical.
1N5408RLG (onsemi): Matches reverse leakage specification (10 µA @ 1000 V) but classified as Not For New Designs. Acceptable for legacy system maintenance only.

Alternative Technology Substitutes (Fast Recovery, Different Package):

BYT78-TR (Vishay General Semiconductor): Fast recovery avalanche diode (250 ns trr) with identical voltage and current ratings. SOD-64 package requires board layout modification. Active status.
BYT56M-TR (Vishay General Semiconductor): Fast recovery avalanche diode (100 ns trr) with superior recovery performance. SOD-64 package. Active status.

Higher Current Alternative (Derating Application):

60S10-TP (Micro Commercial Co): 6 A rated current in DO-201AD package. Provides design margin for applications requiring current derating. Active status.

Compliance Status: All recommended substitutes maintain ROHS3 compliance and EAR99 export classification. Moisture sensitivity levels are consistent with the original FR307-T specification (MSL 1 - Unlimited).

Frequently Asked Questions (FAQ)

Q: Can I directly replace FR307-T with 1N5408GP-TP without circuit modification?

A: Yes. The 1N5408GP-TP maintains identical voltage (1000 V), current (3 A), and package (DO-201AD) specifications. Both are through-hole axial components with compatible pinout and footprint. No circuit modification is required.

Q: What is the difference between fast recovery and standard recovery diodes in these substitutes?

A: Fast recovery diodes (FR307-T, BYT78-TR, BYT56M-TR) have reverse recovery times ≤500 ns, reducing switching losses in high-frequency applications. Standard recovery diodes (1N5408 series) have reverse recovery times >500 ns. For DC rectification applications, both are functionally equivalent. For switching power supplies or high-frequency circuits, fast recovery variants are preferred.

Q: Why do some substitutes show different forward voltage drops?

A: Forward voltage variation (0.95 V to 1.4 V @ 3 A) reflects manufacturing differences across suppliers and technology types. All values remain within acceptable limits for general-purpose rectification. Avalanche diodes (BYT series) typically exhibit higher forward voltage than standard rectifiers.

Q: Can I use the 60S10-TP as a substitute for FR307-T?

A: The 60S10-TP is electrically compatible (1000 V, DO-201AD package) but rated for 6 A instead of 3 A. This represents a higher current capability and can be used in applications where the FR307-T is specified, provided circuit design accounts for the different current rating. This is not a direct one-to-one replacement but a compatible alternative with increased current capacity.

Q: What is the impact of using BYT78-TR or BYT56M-TR instead of FR307-T?

A: Both BYT diodes are avalanche technology with fast recovery characteristics. They maintain 1000 V and 3 A ratings but use SOD-64 package instead of DO-201AD. This requires board layout modification and different mounting hardware. Avalanche diodes provide superior transient protection and faster switching but are not pin-compatible with the original package.

Q: Are all listed substitutes RoHS compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance status, matching the original FR307-T specification. All are suitable for applications requiring RoHS certification.

Q: Which substitute has the best availability?

A: The 1N5408G (Taiwan Semiconductor Corporation) has the highest inventory availability at 38,100 pieces in stock, followed by 1N5408RLG (onsemi) at 27,400 pieces. Both are active products with established supply chains.

Q: Can I use 1N5408RLG for new designs?

A: The 1N5408RLG is classified as Not For New Designs. It is suitable only for maintenance and repair of existing systems using this component. For new designs, select from parts with Active product status: 1N5408GP-TP, 1N5408G, 1N5408-E3/54, FR307GP-AP, BYT78-TR, BYT56M-TR, or 60S10-TP.

Q: What is the operating temperature range consideration when selecting a substitute?

A: The FR307-T operates from -65°C to 175°C. Most substitutes operate within -55°C to 150°C ranges. For applications requiring the full -65°C to 175°C range, select 1N5408-G (Comchip, -65°C to 125°C) or BYT78-TR/BYT56M-TR (Vishay, -55°C to 175°C). Verify application temperature requirements before final selection.

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