1N6465 Equivalent & Substitute Parts

Part Overview

The 1N6465 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This axial-lead component features a 24V reverse standoff voltage with a 41.4V maximum clamping voltage and 69A peak pulse current capability (8/20µs). The part is classified as Active in product status and operates across the temperature range of -55°C to 175°C (TJ).

Equivalent and substitute parts are necessary when the original 1N6465 becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for compatible alternatives with different electrical performance characteristics within acceptable operating parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	27	V
Voltage - Clamping (Max) @ Ipp	41.4	V
Current - Peak Pulse (10/1000µs)	69	A (8/20µs)
Power - Peak Pulse	500	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	B, Axial	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the 1N6465 is determined by the following critical electrical and mechanical parameters:

Voltage Parameters: The reverse standoff voltage (24V typical) and breakdown voltage (27V minimum) establish the protection threshold. Substitute parts must maintain compatibility within the circuit's overvoltage protection scheme. The clamping voltage (41.4V maximum) defines the maximum transient voltage the protected circuit will experience.

Current Handling: The peak pulse current rating (69A at 8/20µs) and power dissipation capability (500W peak pulse) determine the transient energy absorption capacity. Substitute parts with lower current ratings reduce protection effectiveness; higher ratings provide additional margin.

Package and Mounting: The axial through-hole configuration is a mechanical requirement for board assembly compatibility. Substitute parts must support through-hole mounting to maintain assembly process compatibility.

Temperature Range: The operating temperature specification (-55°C to 175°C TJ) must be maintained or exceeded in substitute parts to ensure performance across the intended application environment.

Electrical Type: All substitutes must be unidirectional Zener-type TVS diodes with a single channel to maintain functional equivalence.

Parameter Comparison

Parameter	1N6465 (Microchip)	SA24A (Fairchild)	SA24A-E3/54 (Vishay)	LCE28A (Littelfuse)
Voltage - Reverse Standoff (Typ)	24V	24V	24V	28V
Voltage - Breakdown (Min)	27V	26.7V	26.7V	31.1V
Voltage - Clamping (Max) @ Ipp	41.4V	38.9V	38.9V	45.5V
Current - Peak Pulse (10/1000µs)	69A (8/20µs)	13.1A	12.9A	33A
Power - Peak Pulse	500W	500W	500W	1500W
Operating Temperature Range	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	B, Axial	DO-204AC (DO-15), Axial	DO-204AC (DO-15), Axial	DO-201AA, DO-27, Axial
Type	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1
Product Status	Active	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SA24A-E3/54 (Vishay General Semiconductor - Diodes Division): This part is the primary substitute for the 1N6465. It maintains identical reverse standoff voltage (24V) and breakdown voltage (26.7V), with equivalent clamping voltage (38.9V) and power dissipation (500W). The part is Active in product status and ROHS3 compliant. The peak pulse current is lower (12.9A versus 69A), which represents a reduction in transient energy absorption capacity. This substitute is suitable for applications where the lower current rating is acceptable within the circuit protection scheme.

LCE28A (Littelfuse Inc.): This part offers higher voltage ratings (28V standoff, 31.1V breakdown) and significantly higher power dissipation (1500W peak pulse). The peak pulse current is 33A, which is lower than the 1N6465 but higher than the SA24A variants. The LCE28A is Active in product status and ROHS3 compliant. This substitute is applicable in circuits where higher voltage protection thresholds and greater power handling are required, provided the 28V standoff voltage is compatible with the protected circuit design.

SA24A (Fairchild Semiconductor): This part matches the voltage specifications of the 1N6465 (24V standoff, 26.7V breakdown, 38.9V clamping) with equivalent power dissipation (500W). However, the product status is Obsolete, and the peak pulse current is significantly lower (13.1A). This substitute is not recommended for new designs due to obsolescence status, though it may be considered for legacy system maintenance where inventory exists.

Frequently Asked Questions (FAQ)

Q: Can the SA24A-E3/54 directly replace the 1N6465 in all applications?

A: The SA24A-E3/54 maintains the same voltage protection thresholds (24V standoff, 26.7V breakdown) and power dissipation (500W) as the 1N6465. However, the peak pulse current is reduced from 69A to 12.9A. Direct substitution is valid only when the circuit's transient current does not exceed 12.9A. Applications requiring the full 69A capability require alternative solutions.

Q: What is the difference between the 1N6465 package (B, Axial) and the substitute packages (DO-204AC, DO-201)?

A: All three substitute parts use axial through-hole mounting, which is mechanically compatible with the 1N6465 assembly process. The package designations (B, DO-204AC, DO-201) refer to different physical form factors and lead configurations. Physical board layout verification is necessary to confirm that the substitute package dimensions fit the existing PCB footprint.

Q: Why does the LCE28A have a higher clamping voltage (45.5V) than the 1N6465 (41.4V)?

A: The LCE28A is designed for a higher voltage protection class (28V standoff versus 24V). The higher clamping voltage is a direct result of this higher voltage rating. The LCE28A is suitable only for circuits designed to tolerate a 28V protection threshold. It is not a direct substitute for 24V protection applications.

Q: Is the SA24A suitable for new product designs?

A: The SA24A is classified as Obsolete in product status. New product designs should not incorporate obsolete components. The SA24A-E3/54 (Active status) is the recommended alternative for new designs requiring 24V protection with equivalent electrical characteristics.

Q: What does RoHS compliance mean for TVS diode substitution?

A: RoHS3 compliance indicates that the component meets Restriction of Hazardous Substances regulations. The 1N6465 is RoHS non-compliant, while all three substitute parts are ROHS3 compliant. For applications subject to RoHS requirements, the compliant substitutes (SA24A-E3/54 or LCE28A) must be selected.

Q: Can I use the LCE28A in a circuit designed for the 1N6465?

A: The LCE28A has a higher reverse standoff voltage (28V versus 24V) and higher clamping voltage (45.5V versus 41.4V). Use of the LCE28A in a 24V protection circuit will result in delayed protection activation. The LCE28A is suitable only for circuits designed for 28V protection thresholds.

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