Equivalent & Substitute Parts for 6A4-TP

Part Overview

The 6A4-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 6 A average rectified current in an R-6 axial through-hole package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary to maintain design continuity, support existing production lines, and ensure component availability for repair and maintenance applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	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 @ 400 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 eligibility for the 6A4-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 400 V
Current - Average Rectified (Io): Must equal or exceed 6 A
Mounting Type: Must be Through Hole
Speed Classification: Must be Standard Recovery >500ns, > 200mA (Io)

Secondary Compatibility Factors:

Package / Case: R-6 axial preferred for direct mechanical fit; alternative axial packages acceptable with board layout verification
Operating Temperature Range: Must accommodate application requirements within -55°C to 125°C minimum
RoHS Compliance: ROHS3 compliance preferred for regulatory alignment

The substitute parts identified below meet the primary substitution criteria. The 1N5551 is grouped separately due to current rating limitation (3 A versus 6 A required), making it suitable only for applications with reduced current demands. The 6A04B-G and GI754-E3/54 are direct functional equivalents meeting all primary criteria with identical voltage and current ratings.

Parameter Comparison

Parameter	6A4-TP (Main)	1N5551	6A04B-G	GI754-E3/54
Manufacturer	Micro Commercial Co	Microchip Technology	Comchip Technology	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	6 A	3 A	6 A	6 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 6 A	1.2 V @ 9 A	1 V @ 6 A	900 mV @ 6 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	10 µA @ 400 V	1 µA @ 400 V	10 µA @ 400 V	5 µA @ 400 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	R-6, Axial	B, Axial	R-6, Axial	P600, Axial
Operating Temperature - Junction	-55°C ~ 125°C	-65°C ~ 175°C	-55°C ~ 125°C	-50°C ~ 150°C
Product Status	Not For New Designs	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (6 A Rating):

The 6A04B-G (Comchip Technology) and GI754-E3/54 (Vishay General Semiconductor - Diodes Division) are functionally equivalent to the 6A4-TP. Both parts maintain the 400 V / 6 A electrical specification and are classified as Active products with ROHS3 compliance. The 6A04B-G uses the same R-6 axial package as the main part, enabling direct mechanical substitution. The GI754-E3/54 uses a P600 axial package, which requires board layout verification but maintains identical electrical performance and through-hole mounting compatibility.

Limited Current Application (3 A Rating):

The 1N5551 (Microchip Technology) is rated for 3 A average rectified current, which does not meet the 6 A requirement of the main part. This substitute is applicable only in circuit designs where the actual operating current demand is 3 A or less. The 1N5551 is RoHS non-compliant, which may conflict with regulatory requirements in new applications. The B axial package differs from the R-6 package, requiring board layout modification.

Compliance Considerations:

For applications requiring ROHS3 compliance, the 6A04B-G and GI754-E3/54 are preferred selections. The 1N5551 does not meet RoHS compliance standards and should be avoided in regulated applications.

Temperature Range Considerations:

The 6A04B-G matches the operating temperature range of the main part (-55°C ~ 125°C). The GI754-E3/54 extends the upper temperature limit to 150°C, providing additional thermal margin. The 1N5551 offers an extended range (-65°C ~ 175°C) but is limited by current rating and RoHS non-compliance.

Frequently Asked Questions (FAQ)

Q: Can the 1N5551 be used as a direct replacement for the 6A4-TP?

A: The 1N5551 is not a direct replacement due to current rating mismatch. The 1N5551 is rated for 3 A average rectified current, while the 6A4-TP is rated for 6 A. The 1N5551 is suitable only for applications where the actual circuit current does not exceed 3 A. Additionally, the 1N5551 is RoHS non-compliant and uses a different package (B axial versus R-6 axial), requiring board layout modification.

Q: What is the difference between the 6A04B-G and GI754-E3/54?

A: Both parts meet the 400 V / 6 A electrical specification and are ROHS3 compliant. The primary differences are package type (R-6 for 6A04B-G versus P600 for GI754-E3/54) and operating temperature range (-55°C ~ 125°C for 6A04B-G versus -50°C ~ 150°C for GI754-E3/54). The 6A04B-G provides direct mechanical compatibility with the original R-6 package. The GI754-E3/54 offers extended high-temperature capability.

Q: Are all substitute parts through-hole mounted?

A: Yes, all identified substitute parts (1N5551, 6A04B-G, and GI754-E3/54) are through-hole mounted diodes in axial packages. They are compatible with through-hole PCB designs. Package variations (R-6, B, P600) may require different lead spacing verification during board layout.

Q: Which substitute part is recommended for new designs?

A: The 6A04B-G and GI754-E3/54 are both classified as Active products and are suitable for new designs. The 6A04B-G is preferred if direct R-6 package compatibility is required. The GI754-E3/54 is preferred if extended operating temperature range (-50°C ~ 150°C) is needed. The 1N5551 and 6A4-TP are not recommended for new designs due to product status classification.

Q: Do all substitute parts have the same forward voltage drop?

A: No. The forward voltage specifications differ: 6A4-TP (950 mV @ 6 A), 6A04B-G (1 V @ 6 A), GI754-E3/54 (900 mV @ 6 A), and 1N5551 (1.2 V @ 9 A). These differences may affect circuit performance in applications sensitive to voltage drop. The GI754-E3/54 has the lowest forward voltage at 900 mV, while the 1N5551 has the highest at 1.2 V.

Q: Are there any RoHS compliance concerns with these substitutes?

A: The 6A04B-G and GI754-E3/54 are ROHS3 compliant, matching the compliance status of the main part. The 1N5551 is RoHS non-compliant and should not be used in applications requiring RoHS certification or regulatory compliance.

Q: Can the package differences affect circuit performance?

A: Package differences (R-6, B, P600) are primarily mechanical considerations affecting PCB layout and lead spacing. Electrically, all parts are axial through-hole diodes with compatible electrical characteristics. Board layout verification is required when substituting parts with different package types to ensure proper lead hole alignment and spacing.

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