LCE51A Equivalent & Substitute Parts

Part Overview

The LCE51A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This through-hole component operates across a wide temperature range and provides reliable voltage clamping in active product status. Alternative models become necessary when higher peak pulse current capacity, increased power dissipation capability, or different packaging formats are required for specific circuit implementations.

Substiute Parts

LCE51A

Littelfuse Inc.In Stock: 1125LCE51A Datasheet

Current PartRFQ

5KP51A

LittelfuseIn Stock: 42695KP51A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LCE51A is determined by maintaining electrical equivalence across critical voltage parameters while allowing variation in current handling and power dissipation capacity. The substitute part 5KP51A qualifies as an equivalent based on the following criteria:

Mandatory Matching Parameters:

• Voltage - Reverse Standoff (Typ): 51V
• Voltage - Breakdown (Min): 56.7V
• Voltage - Clamping (Max) @ Ipp: 82.4V
• Unidirectional channel configuration: 1
• Type: Zener
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant

Variable Parameters (Allowed to Differ):

• Current - Peak Pulse: 18.2A (LCE51A) vs. 61.9A (5KP51A)
• Power - Peak Pulse: 1500W (LCE51A) vs. 5000W (5KP51A)
• Package / Case: DO-201AA (LCE51A) vs. P600 (5KP51A)
• Operating Temperature Range: -65°C to 175°C (LCE51A) vs. -55°C to 175°C (5KP51A)

Parameter Comparison

Engineering Selection Recommendations

The 5KP51A serves as a direct electrical substitute for the LCE51A when circuit requirements permit higher peak pulse current and power dissipation. Both components maintain identical voltage characteristics (51V standoff, 56.7V breakdown minimum, 82.4V clamping maximum) and share ROHS3 compliance status, ensuring regulatory equivalence.

Selection between LCE51A and 5KP51A depends on application-specific constraints:

• LCE51A is appropriate for applications with peak pulse current requirements up to 18.2A and power dissipation up to 1500W, with extended low-temperature operation capability to -65°C.
• 5KP51A is appropriate for applications requiring peak pulse current up to 61.9A and power dissipation up to 5000W, with operating temperature range limited to -55°C minimum.

Both components are active products with current inventory availability. Package differences (DO-201AA vs. P600) require mechanical verification for PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 5KP51A replace the LCE51A in any circuit?

A: Electrical substitution is valid when the circuit's peak pulse current requirement does not exceed 61.9A and the minimum operating temperature does not fall below -55°C. The identical voltage parameters (51V standoff, 82.4V clamping) ensure functional equivalence. Physical package differences (DO-201AA vs. P600) require PCB footprint verification.

Q: What are the key parameters that determine substitution eligibility?

A: Voltage - Reverse Standoff, Voltage - Breakdown (Min), and Voltage - Clamping (Max) @ Ipp must remain identical. Current - Peak Pulse and Power - Peak Pulse may increase in the substitute part. Operating temperature range may narrow. Unidirectional channel count and type (Zener) must match.

Q: Does the 5KP51A have better performance than the LCE51A?

A: The 5KP51A provides higher peak pulse current capacity (61.9A vs. 18.2A) and greater power dissipation capability (5000W vs. 1500W). The LCE51A provides extended low-temperature operation to -65°C, compared to -55°C for the 5KP51A. Neither is universally "better"; selection depends on application requirements.

Q: Are there packaging considerations for substitution?

A: Yes. The LCE51A uses DO-201AA package while the 5KP51A uses P600 package. Both are axial through-hole configurations, but physical dimensions and PCB footprints differ. Mechanical compatibility must be verified before substitution.

Q: Do both parts meet the same compliance standards?

A: Yes. Both LCE51A and 5KP51A are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8541.10.0080. Moisture sensitivity level is 1 (Unlimited) for both components.