LC6.5 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The LC6.5 is a unidirectional Zener-type transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This through-hole component operates across a wide temperature range of -65°C to 175°C and is currently in active production status. The LC6.5 is packaged in the DO-13 (DO-202AA) form factor and provides peak pulse power dissipation of 1500W at 100A peak pulse current.

Equivalent and substitute parts are necessary when the original LC6.5 becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when compliance certifications must be updated to meet current regulatory standards.

Substiute Parts

LC6.5

Microchip TechnologyIn Stock: 1069LC6.5 Datasheet

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LCE6.5A

Littelfuse Inc.In Stock: 1150LCE6.5A Datasheet

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LCE7.0A

Littelfuse Inc.In Stock: 1461LCE7.0A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LC6.5 is determined by strict alignment with the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 6.5V or 7.0V (within standard TVS voltage series)
• Current - Peak Pulse (10/1000µs): 100A minimum
• Power - Peak Pulse: 1500W minimum
• Type: Zener (unidirectional)
• Unidirectional Channels: 1
• Mounting Type: Through Hole
• Applications: General Purpose

Secondary Compatibility Factors:

• Voltage - Clamping (Max) @ Ipp: Must not exceed 12.3V for direct drop-in replacement; up to 12V acceptable for 7V standoff variants
• Operating Temperature Range: Minimum -55°C to 175°C acceptable (LC6.5 operates to -65°C)
• Package / Case: DO-13, DO-201AA, DO-27, or Axial configurations all compatible with through-hole assembly

The identified substitute parts LCE6.5A and LCE7.0A meet these criteria through equivalent electrical performance and through-hole mounting compatibility, despite differences in packaging format and manufacturer.

Parameter Comparison

Engineering Selection Recommendations

LC6.5 (Microchip Technology) - Primary Part

The LC6.5 remains the specified component for applications requiring the exact electrical characteristics and temperature range defined in the original design. This part is currently in active production with 1054 units in stock. However, the RoHS non-compliant status may restrict use in applications subject to RoHS3 regulations.

LCE6.5A (Littelfuse Inc.) - Direct Voltage Equivalent Substitute

The LCE6.5A provides identical reverse standoff voltage (6.5V) and breakdown voltage (7.22V) specifications. The clamping voltage is reduced to 11.2V, which provides superior transient suppression compared to the LC6.5. This part is ROHS3 compliant and suitable for applications requiring regulatory compliance. The operating temperature range extends to -55°C, which is acceptable for most general-purpose applications but does not cover the full -65°C lower limit of the LC6.5. Packaging is available in DO-201AA, DO-27, and Axial configurations. Current inventory: 1053 units.

LCE7.0A (Littelfuse Inc.) - Higher Voltage Standoff Substitute

The LCE7.0A operates at a 7.0V reverse standoff voltage, representing a 0.5V increase from the LC6.5 specification. This part is suitable only for applications where the higher protection threshold is acceptable. The clamping voltage of 12.0V closely matches the LC6.5 specification. This part is ROHS3 compliant and available in DO-201AA, DO-27, and Axial configurations. Current inventory: 1366 units.

Compliance Considerations

Selection between LC6.5 and Littelfuse alternatives must account for RoHS compliance requirements. The LC6.5 is RoHS non-compliant, while both LCE6.5A and LCE7.0A are ROHS3 compliant. All three parts are REACH unaffected and classified under ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can the LCE6.5A be used as a direct replacement for the LC6.5?

A: The LCE6.5A is electrically compatible as a direct replacement. Both parts share identical reverse standoff voltage (6.5V) and breakdown voltage (7.22V) specifications. The LCE6.5A actually provides superior clamping performance at 11.2V versus the LC6.5 at 12.3V. The primary consideration is the operating temperature range: the LCE6.5A operates to -55°C while the LC6.5 extends to -65°C. For applications not requiring operation below -55°C, the LCE6.5A is a suitable substitute. Additionally, the LCE6.5A is ROHS3 compliant, whereas the LC6.5 is not.

Q: What is the difference between the LCE6.5A and LCE7.0A?

A: The primary difference is the reverse standoff voltage: LCE6.5A operates at 6.5V while LCE7.0A operates at 7.0V. This 0.5V difference affects the circuit protection threshold. The LCE6.5A is the appropriate choice when matching the original LC6.5 voltage specification. The LCE7.0A should only be selected when the higher 7.0V threshold is compatible with the protected circuit design.

Q: Are the package differences between DO-13 and DO-201 significant for substitution?

A: Both DO-13 (DO-202AA) and DO-201 are through-hole axial lead packages suitable for PCB assembly. The physical dimensions differ slightly, but both are compatible with standard through-hole PCB layouts. The LCE series parts are available in multiple package options including DO-201AA, DO-27, and Axial configurations, providing flexibility for different PCB designs. Verify PCB footprint compatibility before final selection.

Q: Does the lower operating temperature limit of the Littelfuse parts affect general-purpose applications?

A: The LCE6.5A and LCE7.0A operate to -55°C, compared to the LC6.5 at -65°C. For general-purpose applications, the -55°C lower limit is typically sufficient. Only applications explicitly requiring operation below -55°C necessitate the LC6.5. Most industrial and consumer electronics applications operate within the -55°C to 175°C range covered by the Littelfuse alternatives.

Q: What is the significance of the clamping voltage difference between LC6.5 (12.3V) and LCE6.5A (11.2V)?

A: The clamping voltage represents the maximum voltage across the TVS diode during a transient event at peak pulse current. The LCE6.5A's lower clamping voltage of 11.2V provides better protection for downstream components compared to the LC6.5 at 12.3V. This is a favorable characteristic for substitution, as it offers improved transient suppression performance.

Q: Are all three parts suitable for the same peak pulse current and power dissipation?

A: Yes. All three parts—LC6.5, LCE6.5A, and LCE7.0A—are rated for 100A peak pulse current (10/1000µs) and 1500W peak pulse power dissipation. These electrical ratings are identical across all three options, ensuring equivalent surge handling capability.

Q: What inventory considerations should influence part selection?

A: Current inventory levels are: LC6.5 (1054 units), LCE6.5A (1053 units), and LCE7.0A (1366 units). All three parts are in active production with adequate stock. Inventory availability should not be the primary selection criterion; electrical compatibility and compliance requirements should drive the decision.