Equivalent & Substitute Parts for 6A08-G General Purpose Rectifier Diode

Part Overview

The 6A08-G is an 800V, 6A general purpose rectifier diode manufactured by Comchip Technology in R-6 axial through-hole packaging. This component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance parameters are required but the primary part becomes unavailable, when alternative packaging formats are necessary for assembly compatibility, or when supply chain optimization requires component alternatives meeting identical voltage and current specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	6	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 6 A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 800 V
Mounting Type	Through Hole	—
Package / Case	R-6, Axial	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 6A08-G are qualified based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V (exact match required)
Current - Average Rectified (Io): 6 A (exact match required for full-load applications)
Mounting Type: Through Hole (mechanical compatibility)
Technology: Standard Recovery (functional equivalence)
RoHS Status: ROHS3 Compliant (regulatory compliance)

Secondary Compatibility Factors:

Forward voltage (Vf) within acceptable operating range
Reverse leakage current characteristics
Operating temperature range coverage
Package format (axial through-hole variants)

The identified substitute parts maintain the 800V reverse voltage rating and 6A current capacity, ensuring functional equivalence in circuit applications. Package variations (R-6 vs. P600 vs. Axial) represent mechanical alternatives suitable for different PCB layouts and assembly processes while preserving electrical performance.

Parameter Comparison

Parameter	6A08-G (Comchip)	1N5553 (Solid State Inc.)	GI758-E3/54 (Vishay)
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V
Current - Average Rectified (Io)	6 A	3 A	6 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 6 A	1.1 V @ 3 A	950 mV @ 6 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	10 µA @ 800 V	1 µA @ 800 V	5 µA @ 800 V
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	R-6, Axial	Axial	P600, Axial
Operating Temperature - Junction	-55 to 125 °C	-65 to 200 °C	-50 to 150 °C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

6A08-G (Comchip Technology) - Primary Component

Use as the specified component when R-6 axial package format is required for PCB layout compatibility. Active product status with established supply chain. ROHS3 compliant and REACH unaffected. Suitable for applications requiring -55°C to 125°C junction temperature range.

GI758-E3/54 (Vishay General Semiconductor) - Preferred Substitute

Select as primary substitute when 6A current capacity must be maintained and P600 axial package is acceptable. Electrical parameters match the 6A08-G for voltage and current ratings. Forward voltage is 50 mV lower (950 mV vs. 1 V), resulting in reduced power dissipation. Reverse leakage current is lower (5 µA vs. 10 µA). Operating temperature range extends to 150°C. ROHS3 compliant. Highest inventory availability (8322 pcs).

1N5553 (Solid State Inc.) - Limited Substitute

Use only when circuit design permits reduced current capacity (3A vs. 6A). Maintains 800V reverse voltage rating. Forward voltage is 100 mV higher (1.1 V @ 3 A). Reverse leakage current is superior (1 µA @ 800 V). Extended operating temperature range (-65°C to 200°C). ROHS3 compliant. Not suitable for applications requiring full 6A current delivery.

Frequently Asked Questions (FAQ)

Q: Can 1N5553 replace 6A08-G in all applications?

A: No. The 1N5553 is rated for 3A average rectified current, while the 6A08-G is rated for 6A. The 1N5553 is suitable only for circuits designed for 3A or lower current operation. Using the 1N5553 in a 6A application will result in component failure.

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

A: Both are axial through-hole packages for general purpose rectifier diodes. R-6 and P600 represent different physical dimensions and lead configurations. Package selection depends on PCB hole spacing and assembly equipment compatibility. Electrical performance is independent of package format.

Q: Is GI758-E3/54 a direct replacement for 6A08-G?

A: GI758-E3/54 is electrically equivalent for 800V, 6A applications. The P600 package is mechanically different from R-6. Verify PCB layout compatibility before substitution. Forward voltage is 50 mV lower, which may affect circuit timing in precision applications.

Q: Are all three parts ROHS3 compliant?

A: Yes. All three parts (6A08-G, 1N5553, GI758-E3/54) are ROHS3 compliant and suitable for applications requiring lead-free component specifications.

Q: What is the impact of different reverse leakage currents?

A: Reverse leakage current affects power dissipation and circuit performance at high reverse voltages. The 6A08-G has 10 µA leakage, GI758-E3/54 has 5 µA, and 1N5553 has 1 µA. Lower leakage reduces standby power consumption. For most general purpose applications, this difference is negligible.

Q: Can I use GI758-E3/54 in a circuit designed for 6A08-G without modification?

A: Electrical substitution is valid for 800V, 6A applications. Mechanical substitution requires verification that P600 package dimensions fit the PCB layout and assembly process. No circuit modifications are required if package compatibility is confirmed.

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