FR601-T Equivalent & Substitute Parts

Part Overview

The FR601-T is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 6 A average rectified current in an R-6 axial through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The FR601-T features fast recovery characteristics with a reverse recovery time of 150 ns and operates across a junction temperature range of -65°C to 175°C.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	6	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 6 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Mounting Type	Through Hole	—
Package / Case	R-6, Axial	—
Operating Temperature - Junction	-65 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FR601-T is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 6 A
Mounting Type: Through Hole
Package / Case: R-6, Axial (or compatible axial package)

Allowable Variation Parameters:

Voltage - Forward (Vf): Substitute parts may vary within acceptable operating margins
Reverse Recovery Time (trr): Substitute parts may have different recovery characteristics (fast or standard recovery)
Operating Temperature Range: Substitute parts may have narrower or different temperature ranges
RoHS and REACH Compliance: Substitute parts may differ in regulatory compliance status
Product Status: Active or Not For New Designs parts are acceptable alternatives to obsolete parts

Substitute parts are grouped into two categories based on package type and recovery speed characteristics:

Category 1: R-6 Axial Package, 6A Rating — Direct mechanical and electrical equivalents with identical package footprint and current rating. These include FR601GP-AP, HER601GP-AP, 6A05-TP, 6A005B-G, and GI750-E3/73.

Category 2: Alternative Axial Packages, Lower Current Ratings — Parts with different axial package types (B or A) and reduced current ratings (3 A or 1.3 A). These include 1N5807 and 1N6076, suitable only for applications where the full 6 A rating is not required.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Speed	trr	Package	Product Status	RoHS
FR601-T	Diodes Incorporated	50 V	6 A	1.3 V @ 6 A	Fast Recovery ≤ 500ns	150 ns	R-6, Axial	Obsolete	ROHS3 Compliant
FR601GP-AP	Micro Commercial Co	50 V	6 A	1.3 V @ 6 A	Fast Recovery ≤ 500ns	150 ns	R-6, Axial	Active	ROHS3 Compliant
HER601GP-AP	Micro Commercial Co	50 V	6 A	1.1 V @ 6 A	Fast Recovery ≤ 500ns	50 ns	R-6, Axial	Active	ROHS3 Compliant
6A05-TP	Micro Commercial Co	50 V	6 A	950 mV @ 6 A	Standard Recovery >500ns	—	R-6, Axial	Not For New Designs	ROHS3 Compliant
6A005B-G	Comchip Technology	50 V	6 A	1 V @ 6 A	Standard Recovery >500ns	—	R-6, Axial	Active	ROHS3 Compliant
GI750-E3/73	Vishay General Semiconductor	50 V	6 A	900 mV @ 6 A	Standard Recovery >500ns	2.5 µs	P600, Axial	Active	ROHS3 Compliant
1N5807	Microchip Technology	50 V	3 A	875 mV @ 4 A	Fast Recovery ≤ 500ns	30 ns	B, Axial	Active	RoHS non-compliant
1N6076	Microchip Technology	50 V	1.3 A	1.76 V @ 18.8 A	Fast Recovery ≤ 500ns	30 ns	A, Axial	Active	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

FR601GP-AP and HER601GP-AP are the preferred active substitutes for the obsolete FR601-T. Both parts maintain the R-6 axial package, 50 V / 6 A electrical rating, and ROHS3 compliance. FR601GP-AP provides identical forward voltage and recovery time characteristics. HER601GP-AP offers improved reverse recovery time (50 ns versus 150 ns) and lower forward voltage (1.1 V versus 1.3 V), resulting in reduced power dissipation in high-frequency switching applications.

Secondary Substitutes (Same Package and Rating):

6A005B-G (Comchip Technology) and GI750-E3/73 (Vishay) both provide 50 V / 6 A capability in through-hole axial packages with ROHS3 compliance and active product status. These parts employ standard recovery characteristics (>500 ns), making them suitable for lower-frequency rectification circuits. GI750-E3/73 uses a P600 package variant instead of R-6, requiring mechanical verification for board layout compatibility.

6A05-TP (Micro Commercial Co) is classified as Not For New Designs and should be used only for legacy system maintenance where exact part replacement is required.

Limited-Current Substitutes:

1N5807 and 1N6076 are active parts with 50 V reverse voltage rating but reduced current capacity (3 A and 1.3 A respectively). These parts are suitable only for applications where the circuit current requirement does not exceed their rated capacity. Both parts are RoHS non-compliant, which may restrict use in regulated applications. These substitutes should be considered only when the full 6 A rating of the FR601-T is not required by the circuit design.

Frequently Asked Questions (FAQ)

Q: Can FR601GP-AP directly replace FR601-T without circuit modification?

A: Yes. FR601GP-AP maintains identical electrical ratings (50 V, 6 A), forward voltage (1.3 V @ 6 A), recovery speed (fast recovery ≤ 500 ns), and package type (R-6 axial). The part is pin-compatible and requires no circuit changes.

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

A: Fast recovery diodes (FR601-T, FR601GP-AP, HER601GP-AP, 1N5807, 1N6076) have reverse recovery times ≤ 500 ns, suitable for switching power supplies and high-frequency rectification. Standard recovery diodes (6A05-TP, 6A005B-G, GI750-E3/73) have reverse recovery times > 500 ns, appropriate for line-frequency and lower-frequency applications. Recovery speed affects switching losses and electromagnetic interference characteristics.

Q: Can 1N5807 or 1N6076 be used as drop-in replacements?

A: No. While both parts share the 50 V reverse voltage rating and through-hole axial mounting, they have significantly lower current ratings (3 A and 1.3 A respectively). These parts are suitable only for circuits designed for their respective current limits. Using them in a 6 A circuit will result in device failure.

Q: What is the significance of the package designation (R-6 versus P600)?

A: R-6 and P600 are different axial package outlines with different physical dimensions and lead spacing. While both are through-hole axial packages, they are not mechanically interchangeable on a printed circuit board. GI750-E3/73 uses P600 packaging and requires verification that the board layout accommodates this package variant before substitution.

Q: Are there RoHS compliance differences between substitute parts?

A: Yes. FR601-T, FR601GP-AP, HER601GP-AP, 6A05-TP, 6A005B-G, and GI750-E3/73 are all ROHS3 compliant. 1N5807 and 1N6076 are RoHS non-compliant. For applications subject to RoHS regulations, only ROHS3-compliant substitutes are acceptable.

Q: Which substitute offers the lowest forward voltage drop?

A: GI750-E3/73 has the lowest forward voltage at 900 mV @ 6 A, followed by 6A05-TP at 950 mV @ 6 A. Lower forward voltage reduces power dissipation and heat generation. However, GI750-E3/73 uses a different package (P600) requiring mechanical verification.

Q: Is HER601GP-AP suitable for high-frequency switching applications?

A: Yes. HER601GP-AP has a reverse recovery time of 50 ns, significantly faster than FR601-T (150 ns). This faster recovery reduces switching losses and is beneficial in high-frequency power conversion circuits. The lower forward voltage (1.1 V) also contributes to reduced power dissipation.

Q: What inventory considerations apply to these substitutes?

A: FR601GP-AP (870 pcs), HER601GP-AP (720 pcs), 6A005B-G (669 pcs), and GI750-E3/73 (3145 pcs) are all in stock. 6A05-TP has the highest inventory (3263 pcs) but is marked Not For New Designs. 1N5807 (979 pcs) and 1N6076 (1011 pcs) are available but have reduced current ratings.

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