1N6464 Equivalent & Substitute Parts

Part Overview

The 1N6464 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose transient voltage protection applications. This axial-lead through-hole component operates across a temperature range of -55°C to 175°C and is classified as Active product status. The 1N6464 is RoHS non-compliant and carries an unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the original 1N6464 is unavailable, when alternative packaging formats are required for manufacturing processes, or when compliance upgrades to RoHS3 standards are mandated for new designs.

Substiute Parts

1N6464

Microchip TechnologyIn Stock: 9321N6464 Datasheet

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LCE15A

Littelfuse Inc.In Stock: 2372LCE15A Datasheet

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LCE16A

Littelfuse Inc.In Stock: 2686LCE16A Datasheet

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LCE18A

Littelfuse Inc.In Stock: 1007LCE18A Datasheet

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SA15A

Taiwan Semiconductor CorporationIn Stock: 300129SA15A Datasheet

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SA15A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 19315SA15A-E3/54 Datasheet

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SA15A-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 32167SA15A-E3/73 Datasheet

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SAC15-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 4766SAC15-E3/54 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N6464 TVS diode is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 15V nominal
• Voltage - Breakdown (Min): 16.4V minimum
• Voltage - Clamping (Max) @ Ipp: 26.5V maximum
• Current - Peak Pulse (10/1000µs): 107A (8/20µs)
• Power - Peak Pulse: 500W
• Operating Temperature Range: -55°C ~ 175°C (TJ)

Mechanical Compatibility Criteria:

• Unidirectional Channels: 1
• Type: Zener
• Mounting Type: Through Hole
• Applications: General Purpose

Substitute parts are grouped into two categories based on package format and electrical performance:

Group 1: Direct Electrical Equivalents (15V Standoff Voltage) Parts with matching 15V reverse standoff voltage and compatible clamping characteristics: SA15A, SA15A-E3/73, SA15A-E3/54, and SAC15-E3/54. These parts operate within the same voltage protection window as the 1N6464 but utilize different axial package formats (DO-204AC/DO-15).

Group 2: Higher Voltage Standoff Alternatives (16V-18V Standoff Voltage) Parts with elevated reverse standoff voltages: LCE15A (15V), LCE16A (16V), and LCE18A (18V). These Littelfuse components provide alternative clamping characteristics and higher peak pulse power ratings (1500W) in DO-201 package format.

Parameter Comparison

Engineering Selection Recommendations

For Direct Electrical Replacement with RoHS3 Compliance:

The SA15A, SA15A-E3/73, and SA15A-E3/54 parts from Vishay General Semiconductor and Taiwan Semiconductor Corporation provide electrical equivalence to the 1N6464 with identical 15V reverse standoff voltage and 24.4V clamping voltage. All three options are ROHS3 compliant and maintain the same operating temperature range. These parts are suitable for applications where the 1N6464's original performance envelope must be preserved while upgrading to RoHS3 compliance. The primary trade-off is reduced peak pulse current capability (20-21A versus 107A) and lower power dissipation (500W maintained).

For Enhanced Power Dissipation with Alternative Package:

The LCE15A, LCE16A, and LCE18A from Littelfuse Inc. offer increased peak pulse power ratings of 1500W in DO-201 package format. LCE15A maintains the 15V standoff voltage specification. LCE16A and LCE18A provide higher standoff voltages (16V and 18V respectively) for applications requiring elevated voltage protection thresholds. All three Littelfuse options are ROHS3 compliant. These parts are appropriate when circuit board layout accommodates the larger DO-201 package and higher power dissipation capability is required.

For Minimal Design Change:

The SAC15-E3/54 from Vishay General Semiconductor provides the lowest clamping voltage (23.6V) among all substitutes while maintaining 15V standoff voltage, ROHS3 compliance, and DO-204AC package compatibility. This option is suitable for designs where the smallest clamping voltage differential is preferred.

All substitute parts maintain Active product status and REACH Unaffected classification, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the 1N6464 be directly replaced with SA15A or SA15A-E3/73?

A: Yes, within electrical performance constraints. Both parts share identical 15V reverse standoff voltage, 24.4V clamping voltage, and -55°C to 175°C operating temperature range. Both are ROHS3 compliant. The primary difference is package format: SA15A and SA15A-E3/73 use DO-204AC (DO-15) package versus the 1N6464's B axial package. Peak pulse current is reduced from 107A to 20.5A. Verify circuit board layout accommodates the DO-204AC package dimensions before substitution.

Q: What is the difference between LCE15A, LCE16A, and LCE18A?

A: These three Littelfuse parts differ in reverse standoff voltage: LCE15A operates at 15V (matching 1N6464), LCE16A at 16V, and LCE18A at 18V. Correspondingly, clamping voltages increase from 24.4V to 26V to 29.2V. Peak pulse current decreases from 61A to 57A to 51A. All three provide 1500W peak pulse power (versus 500W for 1N6464) and use DO-201 package format. Select based on required voltage protection threshold and available board space for the larger DO-201 package.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (LCE15A, LCE16A, LCE18A, SA15A, SA15A-E3/73, SA15A-E3/54, and SAC15-E3/54) are ROHS3 compliant. The original 1N6464 is RoHS non-compliant. Substitution with any listed part upgrades compliance status for new designs or manufacturing revisions.

Q: Which substitute part has the lowest clamping voltage?

A: SAC15-E3/54 provides the lowest maximum clamping voltage at 23.6V, compared to 26.5V for the 1N6464. This part is suitable for applications where minimal voltage overshoot is critical. It maintains 15V standoff voltage, 500W power rating, and ROHS3 compliance.

Q: Can I use LCE18A as a substitute for 1N6464?

A: LCE18A is electrically compatible for general transient suppression but operates at 18V reverse standoff voltage versus 1N6464's 15V. This higher standoff voltage means the device will not clamp transients until higher voltage levels are reached. Use LCE18A only if circuit design specifically requires 18V standoff voltage protection. The DO-201 package is larger than the 1N6464's B axial package and requires board layout verification.

Q: What is the impact of reduced peak pulse current in substitute parts?

A: SA15A, SA15A-E3/73, and SA15A-E3/54 provide 20-21A peak pulse current versus 1N6464's 107A. LCE15A provides 61A. These reductions affect the maximum transient current the device can suppress. Verify that circuit transient current levels do not exceed the substitute part's peak pulse rating. For high-current transient environments, LCE15A (61A) is preferred over the SA series (20-21A).

Q: Are packaging differences critical for substitution?

A: Yes. The 1N6464 uses B axial package. Substitute parts use either DO-204AC (DO-15) axial package (SA series) or DO-201 package (LCE series). While all are through-hole axial leads, physical dimensions differ. Verify circuit board layout, lead spacing, and mounting hole alignment before substitution. DO-201 package is larger than both B axial and DO-204AC packages.

Q: Which substitute offers the best overall compatibility?

A: SA15A-E3/73 and SA15A-E3/54 provide the closest electrical match to 1N6464 (15V standoff, 24.4V clamping, 500W power, 20.5A peak pulse) with ROHS3 compliance upgrade. The primary consideration is DO-204AC package compatibility with existing board layout. If board space permits DO-201 package, LCE15A offers higher peak pulse current (61A) and power dissipation (1500W).