LCE20A Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The LCE20A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component operates with a 20V reverse standoff voltage and provides 32.4V maximum clamping voltage at peak pulse current. The part is currently in active production status with robust inventory availability (1513 pcs in stock).

Substitute parts become necessary when the LCE20A reaches end-of-life, when alternative packaging formats are required for manufacturing processes, or when higher peak pulse current handling is needed within the same electrical specification envelope.

Substiute Parts

LCE20A

Littelfuse Inc.In Stock: 1615LCE20A Datasheet

Current PartRFQ

5KP20A

Diotec SemiconductorIn Stock: 172765KP20A Datasheet

MFR RecommendedRFQ

SA20A

Fairchild SemiconductorIn Stock: 300483SA20A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LCE20A are qualified based on the following electrical and mechanical parameters:

• Voltage - Reverse Standoff: 20V (identical)
• Voltage - Breakdown (Min): 22.2V (identical)
• Voltage - Clamping (Max) @ Ipp: 32.4V (identical)
• Unidirectional Channels: 1 (identical)
• Type: Zener (identical)
• Mounting Type: Through Hole (identical)
• Applications: General Purpose (identical)
• RoHS Status: ROHS3 Compliant (identical)

Substitutes may vary in Current - Peak Pulse rating, Power - Peak Pulse rating, package format, and operating temperature range, provided the core voltage specifications remain unchanged. These variations allow for different thermal dissipation requirements and manufacturing process compatibility.

Parameter Comparison

Engineering Selection Recommendations

5KP20A (Diotec Semiconductor): This substitute offers identical voltage specifications with significantly higher peak pulse current (154A) and power dissipation (5000W) compared to the LCE20A. The 5KP20A maintains ROHS3 compliance and active product status. The P600 package format differs from the DO-201AA, requiring verification of board layout compatibility. The operating temperature minimum is -50°C versus -55°C for the LCE20A. This substitute is suitable for applications requiring enhanced transient energy absorption within the same voltage protection window.

SA20A (Fairchild Semiconductor): This substitute matches the voltage specifications and operating temperature range of the LCE20A. However, the SA20A is classified as obsolete and carries reduced peak pulse current (15.7A) and power dissipation (500W). The DO-204AC (DO-15) package differs from the DO-201AA. ROHS3 compliance is maintained. This substitute is applicable only when lower transient energy levels are acceptable and obsolete component sourcing is permissible.

Frequently Asked Questions (FAQ)

Q: Can the 5KP20A replace the LCE20A in all applications?

A: The 5KP20A maintains identical voltage specifications (20V standoff, 22.2V breakdown, 32.4V clamping) and is therefore electrically compatible. However, the P600 package differs from the DO-201AA, requiring physical board layout verification. The higher current and power ratings provide additional margin for transient suppression.

Q: Why does the SA20A have lower peak pulse current than the LCE20A?

A: The SA20A is a lower-rated TVS diode within the same voltage class. While it maintains the core voltage specifications, its 15.7A peak pulse current and 500W power rating indicate it is designed for lower-energy transient environments. The obsolete status of this part limits its applicability to legacy system maintenance.

Q: Are all three parts RoHS compliant?

A: Yes, all three parts—LCE20A, 5KP20A, and SA20A—are ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: What is the significance of the different package formats?

A: The LCE20A uses DO-201AA, the 5KP20A uses P600, and the SA20A uses DO-204AC (DO-15). These are distinct through-hole axial package formats with different physical dimensions and lead spacing. Board layout and assembly equipment compatibility must be verified before substitution.

Q: Can I use the SA20A as a direct replacement for the LCE20A?

A: The SA20A is electrically compatible at the voltage level but is rated for significantly lower transient energy (500W versus 1500W). Additionally, the SA20A is obsolete, making long-term sourcing problematic. Use only if application requirements permit reduced transient handling capacity and obsolete component sourcing is acceptable.