LC8.5A Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The LC8.5A 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 with 952 units in stock.

Substitute parts become necessary when the primary component experiences extended lead times, inventory constraints, or when design requirements permit operation within alternative electrical specifications. The LC8.5A can be replaced with functionally equivalent TVS diodes that maintain compatible voltage clamping, peak pulse current handling, and power dissipation characteristics within acceptable engineering tolerances.

Substiute Parts

LC8.5A

Microchip TechnologyIn Stock: 1033LC8.5A Datasheet

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1.5KE10A

Taiwan Semiconductor CorporationIn Stock: 43181.5KE10A Datasheet

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LCE7.5A

LittelfuseIn Stock: 1007LCE7.5A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LC8.5A are selected based on strict electrical parameter compatibility within the following criteria:

Primary Substitution Parameters:

• Voltage - Reverse Standoff (Typ): 8.5V ± tolerance
• Voltage - Clamping (Max) @ Ipp: 14.4V ± tolerance
• Current - Peak Pulse (10/1000µs): 100A minimum
• Power - Peak Pulse: 1500W minimum
• Type: Zener, Unidirectional
• Mounting Type: Through Hole
• Applications: General Purpose

Secondary Compatibility Parameters:

• Operating Temperature Range: Must support minimum -55°C to 175°C
• Moisture Sensitivity Level: MSL 1 (Unlimited)
• REACH Status: REACH Unaffected
• ECCN Classification: EAR99

The substitute parts identified (1.5KE10A and LCE7.5A) maintain electrical performance within acceptable engineering margins for voltage clamping, peak pulse current, and power dissipation. Package variations (DO-201 vs. DO-13) are noted as mechanical considerations for circuit board layout compatibility.

Parameter Comparison

Engineering Selection Recommendations

1.5KE10A (Taiwan Semiconductor Corporation)

The 1.5KE10A demonstrates the closest electrical alignment with the LC8.5A across all critical parameters. Reverse standoff voltage (8.55V) and clamping voltage (14.5V) remain within 0.6% and 0.7% of the primary part specifications, respectively. Peak pulse current capability (108A) exceeds the LC8.5A requirement by 8%, providing additional margin. This substitute achieves ROHS3 compliance, addressing regulatory requirements where the LC8.5A does not. The operating temperature minimum of -55°C represents a 10°C reduction from the LC8.5A specification. Package configuration (DO-201) differs from the primary part (DO-13), requiring circuit board layout verification.

LCE7.5A (Littelfuse)

The LCE7.5A operates at a lower reverse standoff voltage (7.5V) and clamping voltage (12.9V), representing 11.8% and 10.4% reductions respectively from the LC8.5A. This substitute is suitable for applications where lower voltage protection thresholds are acceptable or where circuit design permits operation at reduced clamping levels. Peak pulse current (100A) matches the primary part exactly. ROHS3 compliance is achieved. Operating temperature range (-55 to 175°C) and package configuration (DO-201) are identical to the 1.5KE10A. Inventory availability (937 units) supports immediate procurement.

Both substitutes maintain 1500W peak pulse power dissipation and MSL 1 moisture sensitivity classification. Selection between alternatives depends on circuit voltage protection requirements and package compatibility with existing board layouts.

Frequently Asked Questions (FAQ)

Q: Can the 1.5KE10A directly replace the LC8.5A in all applications?

A: The 1.5KE10A provides electrical substitution for general-purpose TVS applications where the LC8.5A is specified. Clamping voltage (14.5V vs. 14.4V) and reverse standoff voltage (8.55V vs. 8.5V) remain within 1% tolerance. Circuit board layout must accommodate the DO-201 package geometry, which differs from the DO-13 package of the primary part. Operating temperature minimum (-55°C vs. -65°C) may affect applications requiring extended low-temperature operation.

Q: What is the primary difference between the 1.5KE10A and LCE7.5A substitutes?

A: The 1.5KE10A maintains voltage specifications closer to the LC8.5A (8.55V standoff, 14.5V clamp), while the LCE7.5A operates at significantly lower voltage thresholds (7.5V standoff, 12.9V clamp). The LCE7.5A is appropriate for circuits designed for lower voltage protection levels. Both achieve ROHS3 compliance and support identical peak pulse current and power ratings.

Q: Does package type affect substitution compatibility?

A: Yes. The LC8.5A uses DO-13 (DO-202AA) packaging, while both substitutes use DO-201 packaging. These packages have different physical dimensions and lead configurations. Circuit board layout, PCB trace routing, and component spacing must be verified before substitution. Through-hole mounting compatibility is maintained across all three parts.

Q: Are there temperature range limitations when using substitutes?

A: The LC8.5A operates from -65°C to 175°C. Both substitutes operate from -55°C to 175°C, representing a 10°C reduction in minimum operating temperature. Applications requiring operation below -55°C must retain the LC8.5A. The maximum operating temperature (175°C) is identical across all three parts.

Q: What compliance certifications differ between the primary part and substitutes?

A: The LC8.5A is RoHS non-compliant. Both the 1.5KE10A and LCE7.5A achieve ROHS3 compliance. All three parts maintain REACH Unaffected status and EAR99 ECCN classification. Applications subject to RoHS regulatory requirements must use either substitute part.

Q: How do peak pulse current ratings affect substitution decisions?

A: The LC8.5A and LCE7.5A both support 100A peak pulse current (10/1000µs). The 1.5KE10A supports 108A, providing 8% additional margin. All three parts maintain 1500W peak pulse power dissipation. Selection based on current rating alone does not differentiate these substitutes; voltage clamping characteristics are the primary differentiator.

Q: Can the LCE7.5A be used in applications originally designed for the LC8.5A?

A: The LCE7.5A operates at lower voltage thresholds (7.5V standoff vs. 8.5V, 12.9V clamp vs. 14.4V). This substitute is appropriate only for circuits where lower voltage protection levels are acceptable or where the original design permits operation at reduced clamping voltages. Circuits requiring the specific 8.5V standoff voltage of the LC8.5A should use the 1.5KE10A instead.