Equivalent & Substitute Parts for 6A8-TP General Purpose Rectifier Diode

Part Overview

The 6A8-TP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 800 V DC reverse voltage and 6 A average rectified current in an R-6 axial through-hole package. This part carries a "Not For New Designs" product status, indicating it has been superseded in the manufacturer's product line. Identification of equivalent and substitute parts is necessary for design continuity, legacy system maintenance, and component sourcing when original inventory becomes unavailable.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	6	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 6 A	mV
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°C ~ 125°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 6A8-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 800 V
Current - Average Rectified (Io): Must equal or exceed 6 A
Mounting Type: Through Hole
Technology: Standard recovery rectifier

Secondary Compatibility Factors:

Package / Case: R-6 axial preferred for direct mechanical fit; alternative axial packages acceptable with board layout verification
Forward voltage (Vf): Operational compatibility within standard rectifier specifications
Reverse leakage current: Must not exceed application requirements
Operating temperature range: Must encompass application operating conditions
RoHS compliance: ROHS3 Compliant status required for regulatory alignment

Substitution Groups:

Group 1 - Direct Equivalent (Same Voltage & Current Rating): Parts meeting 800 V / 6 A specifications in R-6 package: 6A08B-G (Comchip Technology), GI758-E3/54 (Vishay)

Group 2 - Higher Voltage Rating (Voltage Derating Acceptable): Parts rated 1000 V / 6 A where 800 V application permits voltage margin: 6A10B-G (Comchip Technology)

Group 3 - Lower Current Rating (Current Derating Required): Parts rated 800 V / 3 A or 1000 V / 3 A where application current does not exceed 3 A: 1N5553 (Solid State Inc.), 1N5554 (Solid State Inc.)

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Reverse Leakage @ Vr [µA]	Temp Range [°C]	Product Status
6A8-TP	Micro Commercial Co	800	6	950 @ 6A	R-6, Axial	10 @ 800V	-55 ~ 125	Not For New Designs
6A08B-G	Comchip Technology	800	6	1000 @ 6A	R-6, Axial	10 @ 800V	-55 ~ 125	Active
GI758-E3/54	Vishay General Semiconductor	800	6	950 @ 6A	P600, Axial	5 @ 800V	-50 ~ 150	Active
6A10B-G	Comchip Technology	1000	6	1000 @ 6A	R-6, Axial	10 @ 1000V	-55 ~ 125	Active
1N5553	Solid State Inc.	800	3	1100 @ 3A	Axial	1 @ 800V	-65 ~ 200	Active
1N5554	Solid State Inc.	1000	3	1100 @ 3A	Axial	1 @ 1000V	-65 ~ 200	Active

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The 6A08B-G (Comchip Technology) is the primary substitute. It maintains identical voltage (800 V) and current (6 A) ratings, R-6 axial package compatibility, and Active product status. Forward voltage specification is marginally higher (1000 mV vs. 950 mV @ 6 A), which is within standard rectifier tolerance and does not affect circuit functionality. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) match the original part.

The GI758-E3/54 (Vishay General Semiconductor) is an alternative direct equivalent with identical electrical ratings and Active status. The P600 package differs from R-6 but maintains axial through-hole mounting. This part exhibits lower reverse leakage (5 µA vs. 10 µA @ 800 V) and extended operating temperature range (-50°C ~ 150°C vs. -55°C ~ 125°C), providing enhanced performance margins. Reverse recovery time specification (2.5 µs) is provided, indicating superior switching characteristics.

For Voltage-Derating Applications:

The 6A10B-G (Comchip Technology) is suitable where circuit design permits 1000 V reverse voltage rating in an 800 V application. This part maintains 6 A current capacity and R-6 package compatibility with Active product status. Voltage derating provides additional safety margin in high-voltage circuits.

For Current-Derating Applications:

The 1N5553 and 1N5554 (Solid State Inc.) are applicable only where application current requirements do not exceed 3 A. Both parts are Active with extended temperature ranges (-65°C ~ 200°C). The 1N5553 maintains 800 V rating; the 1N5554 provides 1000 V rating. These parts are supplied in standard axial package without R-6 designation. Current derating from 6 A to 3 A represents a significant design constraint and is not recommended for applications requiring full 6 A capacity.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and EAR99 ECCN classification, ensuring regulatory alignment with the original 6A8-TP. Moisture sensitivity level (MSL 1 - Unlimited) is consistent across Comchip and Micro Commercial Co parts, indicating equivalent handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the 6A08B-G directly replace the 6A8-TP without circuit modification?

A: Yes. The 6A08B-G maintains identical voltage (800 V) and current (6 A) ratings, R-6 axial package, and operating temperature range. Forward voltage is 1000 mV versus 950 mV at 6 A, a difference within standard rectifier specifications that does not require circuit redesign.

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

A: Both are axial through-hole packages for general purpose rectifier diodes. R-6 and P600 differ in physical dimensions and lead spacing. The GI758-E3/54 (P600 package) requires verification of PCB hole spacing and lead length compatibility before substitution. Electrical performance is equivalent.

Q: Can I use the 1N5553 or 1N5554 if my circuit only draws 3 A?

A: Yes, if application current does not exceed 3 A. However, this represents current derating from the original 6 A specification. The 1N5553 (800 V / 3 A) and 1N5554 (1000 V / 3 A) are Active parts with extended temperature ranges, making them suitable for current-limited applications. Verify that 3 A capacity meets circuit requirements before selection.

Q: Why is the 6A8-TP marked "Not For New Designs"?

A: This status indicates the part has been superseded by the manufacturer. The 6A08B-G (Comchip Technology) or GI758-E3/54 (Vishay) are recommended for new designs. The 6A8-TP remains available for legacy system support and maintenance.

Q: Does the GI758-E3/54 have better performance than the 6A08B-G?

A: The GI758-E3/54 provides lower reverse leakage current (5 µA vs. 10 µA @ 800 V), faster reverse recovery time (2.5 µs specified), and extended operating temperature range (-50°C ~ 150°C vs. -55°C ~ 125°C). These characteristics represent performance enhancements suitable for demanding applications. Both parts are electrically equivalent for standard rectification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (6A08B-G, GI758-E3/54, 6A10B-G, 1N5553, 1N5554) carry ROHS3 Compliant status, matching the original 6A8-TP specification.

Q: Can I use the 6A10B-G (1000 V rating) in place of the 6A8-TP (800 V rating)?

A: Yes, for applications where 800 V reverse voltage is the design requirement. The 6A10B-G's 1000 V rating provides voltage derating margin and is electrically compatible. This substitution is appropriate for circuits with voltage headroom. Verify that the higher voltage rating does not introduce unintended circuit behavior before implementation.

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