FR306-T Equivalent & Substitute Parts

Part Overview

The FR306-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 800 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The FR306-T features fast recovery characteristics with a reverse recovery time of 500 ns, suitable for applications requiring rapid switching performance. Substitutes must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available package and technology options.

Key Parameters

Parameter	FR306-T Specification
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Reverse Recovery Time (trr)	500 ns
Current - Reverse Leakage @ Vr	10 µA @ 800 V
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Operating Temperature - Junction	-65°C ~ 175°C
Technology	Standard
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the FR306-T is determined by the following critical parameters:

Mandatory Electrical Compatibility:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Current - Average Rectified (Io): 3 A minimum
Mounting Type: Through Hole
Package compatibility: DO-201AD axial or equivalent axial package

Performance Considerations:

Speed classification: Fast Recovery (≤ 500 ns) or Standard Recovery (> 500 ns) acceptable
Reverse Recovery Time (trr): Values up to 7.5 µs acceptable
Forward voltage (Vf): Range 1.0 V to 1.7 V @ 3 A acceptable
Reverse leakage current: 1 µA to 10 µA @ 800 V acceptable

Compliance Requirements:

RoHS3 Compliant status required
Operating temperature range: Minimum -55°C to 150°C required

Substitute parts are grouped into two categories: MFR Recommended (direct manufacturer recommendations) and Parametric Equivalent (parts meeting all electrical and mechanical criteria).

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ 3A	Speed	trr	Ir @ Vr	Package	Temp Range	Status
FR306-T	Diodes Incorporated	800 V	3 A	1.3 V	Fast ≤ 500 ns	500 ns	10 µA @ 800 V	DO-201AD	-65°C ~ 175°C	Obsolete
1N5407G	Taiwan Semiconductor Corporation	800 V	3 A	1 V	Standard > 500 ns	—	5 µA @ 800 V	DO-201AD	-55°C ~ 150°C	Active
1N5407RLG	onsemi	800 V	3 A	1 V	Standard > 500 ns	—	10 µA @ 800 V	DO-201AA / DO-27	-65°C ~ 150°C	Not For New Designs
1N5627-TR	Vishay General Semiconductor - Diodes Division	800 V	3 A	1 V	Standard > 500 ns	7.5 µs	1 µA @ 800 V	SOD-64	-55°C ~ 175°C	Active
EGP30K	Fairchild Semiconductor	800 V	3 A	1.7 V	Fast ≤ 500 ns	75 ns	5 µA @ 800 V	DO-201AD	-65°C ~ 150°C	Active
GP30K-E3/54	Vishay General Semiconductor - Diodes Division	800 V	3 A	1.1 V	Standard > 500 ns	5 µs	5 µA @ 800 V	DO-201AD	-65°C ~ 175°C	Active
UF5407-E3/54	Vishay General Semiconductor - Diodes Division	800 V	3 A	1.7 V	Fast ≤ 500 ns	75 ns	10 µA @ 800 V	DO-201AD	-55°C ~ 150°C	Active
RGP30K-E3/54	Vishay General Semiconductor - Diodes Division	800 V	3 A	1.3 V	Fast ≤ 500 ns	500 ns	5 µA @ 800 V	DO-201AD	-65°C ~ 175°C	Active

Engineering Selection Recommendations

Primary Recommendation: RGP30K-E3/54

The RGP30K-E3/54 (Vishay General Semiconductor - Diodes Division) is the parametric equivalent with the closest electrical match to the FR306-T. This part maintains identical voltage and current ratings, matching forward voltage (1.3 V @ 3 A), reverse recovery time (500 ns), and operating temperature range (-65°C ~ 175°C). The RGP30K-E3/54 is active in production status and ROHS3 compliant. The DO-201AD package provides direct mechanical compatibility.

Secondary Recommendations for Active Production:

GP30K-E3/54 (Vishay General Semiconductor - Diodes Division): Active status with extended temperature range (-65°C ~ 175°C). Forward voltage is lower (1.1 V @ 3 A), and reverse recovery time is longer (5 µs). Suitable for applications where lower forward voltage drop is beneficial and switching speed is not critical.
1N5407G (Taiwan Semiconductor Corporation): Active status with lowest forward voltage (1 V @ 3 A) and lowest reverse leakage (5 µA @ 800 V). Operating temperature range is -55°C ~ 150°C. Suitable for applications with reduced temperature requirements.
EGP30K (Fairchild Semiconductor): Active status with fast recovery characteristics (75 ns trr). Forward voltage is higher (1.7 V @ 3 A). Operating temperature range is -65°C ~ 150°C. Suitable for high-speed switching applications.

Not Recommended for New Designs:

1N5407RLG (onsemi): Marked "Not For New Designs" status. While electrically compatible, this part should not be selected for new circuit designs.

Package Consideration:

1N5627-TR (Vishay General Semiconductor - Diodes Division): Uses SOD-64 package instead of DO-201AD. This part is electrically compatible but requires mechanical redesign for board layout and mounting. Select only if SOD-64 package is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can I use 1N5407G as a direct replacement for FR306-T?

A: The 1N5407G meets all mandatory electrical specifications (800 V, 3 A, DO-201AD package) and is active in production. However, the operating temperature range is reduced to -55°C ~ 150°C compared to FR306-T's -65°C ~ 175°C. Verify that your application does not require operation below -55°C or above 150°C before selection.

Q: What is the difference between fast recovery and standard recovery diodes in this group?

A: Fast recovery diodes (FR306-T, EGP30K, UF5407-E3/54, RGP30K-E3/54) have reverse recovery times ≤ 500 ns, enabling rapid switching transitions. Standard recovery diodes (1N5407G, 1N5407RLG, GP30K-E3/54, 1N5627-TR) have reverse recovery times > 500 ns. Fast recovery types are preferred in high-frequency switching applications; standard recovery types are acceptable in lower-frequency circuits.

Q: Is the RGP30K-E3/54 truly equivalent to FR306-T?

A: The RGP30K-E3/54 is a parametric equivalent, matching all critical electrical parameters: 800 V reverse voltage, 3 A current rating, 1.3 V forward voltage @ 3 A, 500 ns reverse recovery time, and -65°C ~ 175°C operating temperature range. Both use DO-201AD axial packages. The primary difference is manufacturer (Vishay vs. Diodes Incorporated) and active production status.

Q: Can I substitute a part with a different package, such as 1N5627-TR in SOD-64?

A: The 1N5627-TR is electrically compatible but uses SOD-64 package instead of DO-201AD. Package substitution requires mechanical redesign of the circuit board layout and component mounting. Proceed only if your design can accommodate SOD-64 package dimensions and lead configuration.

Q: Why does forward voltage vary among these parts?

A: Forward voltage variation (1.0 V to 1.7 V @ 3 A) reflects differences in semiconductor material quality, doping profiles, and manufacturing processes among manufacturers. Higher forward voltage results in greater power dissipation; lower forward voltage reduces heat generation. Select based on thermal budget and efficiency requirements of your application.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. Compliance with environmental regulations is maintained across all active production alternatives.

Q: What does "Not For New Designs" mean for 1N5407RLG?

A: "Not For New Designs" indicates that onsemi has designated this part for legacy support only. While the part remains available and functional, onsemi recommends using alternative parts for new circuit designs. The 1N5407G or RGP30K-E3/54 are preferred alternatives.

Q: How do I choose between multiple active substitutes?

A: Selection depends on application-specific requirements: (1) If temperature range -65°C ~ 175°C is required, select RGP30K-E3/54 or GP30K-E3/54. (2) If lowest forward voltage drop is critical, select 1N5407G. (3) If fastest switching is required, select EGP30K or UF5407-E3/54. (4) If lowest reverse leakage is required, select 1N5627-TR. Verify all selected parameters against your circuit design specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message