6A1-T General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The 6A1-T is a general purpose rectifier diode manufactured by Diodes Incorporated, rated for 100 V DC reverse voltage and 6 A average rectified current. The device features standard recovery characteristics with a forward voltage of 900 mV at 6 A and is housed in an R-6 axial through-hole package. The 6A1-T is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and recovery speed variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	6	A
Voltage - Forward (Vf) (Max) @ If	900 mV @ 6 A	mV @ A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 100 V
Mounting Type	Through Hole	—
Package / Case	R-6, Axial	—
Operating Temperature - Junction	-65°C ~ 175°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 6A1-T is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 100 V
Current - Average Rectified (Io): Must equal or exceed 6 A
Voltage - Forward (Vf) (Max) @ If: Must be compatible at rated current
Current - Reverse Leakage @ Vr: Must not exceed specified limits

Mechanical Compatibility Requirements:

Mounting Type: Through Hole (fixed)
Package / Case: R-6 or P600 axial packages (both are through-hole axial configurations)

Thermal Compatibility Requirements:

Operating Temperature - Junction: Must accommodate the application's thermal range

Recovery Speed Consideration:

Standard Recovery (>500ns) and Fast Recovery (≤500ns) diodes are both acceptable substitutes, as recovery speed does not degrade electrical compatibility when faster recovery is provided

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and package specifications) and Compatible Substitutes (meeting or exceeding all electrical parameters with alternative packaging or recovery characteristics).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV @ A]	Speed	Package	Tj Range [°C]	Product Status	RoHS Status
6A1-T	Diodes Incorporated	100	6	900 @ 6	Standard Recovery >500ns	R-6, Axial	-65 ~ 175	Obsolete	ROHS3 Compliant
1N5809	Microchip Technology	100	3	875 @ 4	Fast Recovery ≤500ns	B, Axial	-65 ~ 175	Active	RoHS non-compliant
1N6077	Microchip Technology	100	1.3	1.76 V @ 18.8 A	Fast Recovery ≤500ns	A, Axial	-65 ~ 155	Active	RoHS non-compliant
6A01-G	Comchip Technology	100	6	1000 @ 6	Standard Recovery >500ns	R-6, Axial	-55 ~ 125	Active	ROHS3 Compliant
6A01B-G	Comchip Technology	100	6	1000 @ 6	Standard Recovery >500ns	R-6, Axial	-55 ~ 125	Active	ROHS3 Compliant
6A1-TP	Micro Commercial Co	100	6	950 @ 6	Standard Recovery >500ns	R-6, Axial	-55 ~ 125	Not For New Designs	ROHS3 Compliant
FR602GP-AP	Micro Commercial Co	100	6	1300 @ 6	Fast Recovery ≤500ns	R-6, Axial	-55 ~ 150	Active	ROHS3 Compliant
GI751-E3/54	Vishay General Semiconductor - Diodes Division	100	6	900 @ 6	Standard Recovery >500ns	P600, Axial	-50 ~ 150	Active	ROHS3 Compliant
GI751-E3/73	Vishay General Semiconductor - Diodes Division	100	6	900 @ 6	Standard Recovery >500ns	P600, Axial	-50 ~ 150	Active	ROHS3 Compliant
HER602GP-AP	Micro Commercial Co	100	6	1100 @ 6	Fast Recovery ≤500ns	R-6, Axial	-55 ~ 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended for Replacement):

The following parts provide direct electrical and mechanical equivalence to the 6A1-T:

6A01-G (Comchip Technology): Matches 100 V, 6 A specifications with R-6 axial package. Active product status. ROHS3 compliant. Operating temperature range -55°C to 125°C is narrower than the original part.
6A01B-G (Comchip Technology): Identical electrical and package specifications to 6A01-G. Active product status. ROHS3 compliant. Bulk packaging option.
GI751-E3/54 and GI751-E3/73 (Vishay General Semiconductor - Diodes Division): Both provide 100 V, 6 A ratings with identical forward voltage (900 mV @ 6 A). P600 axial package is mechanically compatible with R-6 through-hole mounting. Active product status. ROHS3 compliant. Operating temperature range -50°C to 150°C.

Compatible Substitutes (Acceptable with Application Review):

HER602GP-AP (Micro Commercial Co): Meets 100 V, 6 A requirements with R-6 axial package. Fast recovery characteristic (50 ns). Active product status. ROHS3 compliant. Forward voltage 1.1 V @ 6 A is higher than the original part.
FR602GP-AP (Micro Commercial Co): Meets 100 V, 6 A requirements with R-6 axial package. Fast recovery characteristic (150 ns). Active product status. ROHS3 compliant. Forward voltage 1.3 V @ 6 A is higher than the original part.

Not Recommended for New Designs:

6A1-TP (Micro Commercial Co): Marked as "Not For New Designs" despite meeting electrical specifications.

Insufficient Current Rating:

1N5809 (Microchip Technology): 3 A average rectified current does not meet the 6 A requirement.
1N6077 (Microchip Technology): 1.3 A average rectified current does not meet the 6 A requirement.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a lower forward voltage than the 6A1-T?

A: Yes. Lower forward voltage (such as 875 mV in the 1N5809) indicates improved efficiency. However, the 1N5809 is rated for only 3 A, which does not meet the 6 A requirement of the original circuit.

Q: What is the difference between R-6 and P600 packages?

A: Both R-6 and P600 are through-hole axial packages used for rectifier diodes. They are mechanically compatible in through-hole PCB applications. The P600 package is used by Vishay for the GI751 series. Physical dimensions may vary slightly, but both accommodate standard through-hole mounting.

Q: Can I use a fast recovery diode as a substitute for a standard recovery diode?

A: Yes. Fast recovery diodes (≤500ns) are compatible substitutes for standard recovery diodes (>500ns). Faster recovery reduces switching losses and electromagnetic interference, providing equal or improved performance in most applications.

Q: Why is the 6A1-TP marked as "Not For New Designs"?

A: The 6A1-TP is classified as "Not For New Designs" by the manufacturer, indicating that the product line is being phased out. While it meets the electrical specifications of the 6A1-T, active alternatives such as 6A01-G or GI751-E3/73 are preferred for new circuit designs.

Q: What is the impact of operating temperature range differences?

A: The 6A1-T operates from -65°C to 175°C. Substitute parts with narrower ranges (such as 6A01-G at -55°C to 125°C) are suitable for applications within their specified range. Applications requiring the full -65°C to 175°C range should use GI751-E3/54 or GI751-E3/73 (-50°C to 150°C) or verify that the narrower range is acceptable for the specific circuit environment.

Q: Are there compliance differences between substitute parts?

A: Yes. The 6A1-T is ROHS3 compliant. Most active substitutes (6A01-G, 6A01B-G, GI751-E3/54, GI751-E3/73, FR602GP-AP, HER602GP-AP) are also ROHS3 compliant. The 1N5809 and 1N6077 are RoHS non-compliant and should not be used in applications requiring RoHS compliance.

Q: Can I substitute a 6 A diode with a higher current rating?

A: Yes. A diode rated for higher current (such as 10 A or 15 A) will function in a 6 A application. However, no higher-current substitutes are provided in this reference. The selected substitute should maintain the same voltage rating (100 V) and be compatible with the circuit's thermal and mechanical constraints.

Q: What does "Current - Reverse Leakage @ Vr" mean for substitution?

A: Reverse leakage current is the small current that flows through the diode when reverse biased. The 6A1-T specifies 10 µA @ 100 V. Substitutes with equal or lower reverse leakage (such as GI751 series at 5 µA) are acceptable. Higher reverse leakage may indicate degraded performance or reliability concerns.

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