LCE12 Equivalent & Substitute Parts

Part Overview

The LCE12 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 12V reverse standoff voltage with a 20.9V maximum clamping voltage and 75A peak pulse current capability in a through-hole DO-201 package. The LCE12 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	LCE12 Value
Voltage - Reverse Standoff (Typ)	12V
Voltage - Breakdown (Min)	12.6V
Voltage - Clamping (Max) @ Ipp	20.9V
Current - Peak Pulse (10/1000µs)	75A
Power - Peak Pulse	1500W
Mounting Type	Through Hole
Package / Case	DO-201AA, DO-27, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution eligibility for the LCE12 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 12V to maintain circuit protection thresholds
Voltage - Clamping (Max) @ Ipp: Must not exceed 20.9V to ensure adequate transient suppression
Current - Peak Pulse (10/1000µs): Must be at least 75A to handle the specified pulse conditions
Power - Peak Pulse: Must be at least 1500W to dissipate transient energy
Mounting Type: Must be through-hole compatible
Type: Must be Zener diode technology
Unidirectional Channels: Must be 1 channel

The substitute parts listed below meet these core electrical and mechanical requirements, though variations in package style and manufacturer specifications are noted.

Parameter Comparison

Parameter	LCE12	LCE12A	1N6359	1N6471	5KP12E3/TR13
Manufacturer	Littelfuse Inc.	Littelfuse	Microchip Technology	Semtech Corporation	Microchip Technology
Voltage - Reverse Standoff (Typ)	12V	12V	12V	12V	12V
Voltage - Breakdown (Min)	12.6V	13.3V	14.1V	13.6V	13.3V
Voltage - Clamping (Max) @ Ipp	20.9V	19.9V	16.5V	22.6V	22V
Current - Peak Pulse (10/1000µs)	75A	75A	70A	66A	227A
Power - Peak Pulse	1500W	1500W	1500W	1500W	5000W
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AA, DO-27, Axial	DO-201AA, DO-27, Axial	DO-13	Axial	P600, Axial
Operating Temperature	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TJ)	-65°C ~ 175°C (TJ)	-65°C ~ 175°C (TJ)	-55°C ~ 175°C (TJ)
Product Status	Obsolete	Active	Active	Discontinued at DiGi Electronics	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

LCE12A is the primary direct substitute for the LCE12. Both parts are manufactured by Littelfuse, share identical reverse standoff voltage (12V), peak pulse current (75A), and power dissipation (1500W) specifications. The LCE12A features a slightly lower clamping voltage (19.9V vs. 20.9V) and is currently in active production status with ROHS3 compliance. Package compatibility is maintained across DO-201AA, DO-27, and Axial configurations.

1N6359 (Microchip Technology) meets the core voltage and power requirements but operates with reduced peak pulse current (70A vs. 75A) and features a different package style (DO-13). This part is active and REACH unaffected but is not RoHS compliant. Selection of this substitute requires confirmation that the 70A peak pulse current is sufficient for the application.

1N6471 (Semtech Corporation) is discontinued at DiGi Electronics and features a higher clamping voltage (22.6V) with reduced peak pulse current (66A). This part is not recommended for new designs due to discontinued status and reduced current capability.

5KP12E3/TR13 (Microchip Technology) provides significantly higher peak pulse current (227A) and power dissipation (5000W) in a P600 package. This part is suitable only for applications requiring higher transient energy handling and is not a direct form-fit-function replacement due to package differences.

For new designs and production continuity, LCE12A is the recommended equivalent substitute.

Frequently Asked Questions (FAQ)

Q: Can LCE12A be used as a direct replacement for LCE12?

A: Yes. LCE12A is manufactured by the same supplier (Littelfuse) and maintains identical reverse standoff voltage (12V), peak pulse current (75A), and power dissipation (1500W) specifications. The slightly lower clamping voltage (19.9V vs. 20.9V) provides enhanced protection margins. Package compatibility is maintained.

Q: What is the difference between LCE12 and 1N6359?

A: Both parts share the same 12V reverse standoff voltage and 1500W power dissipation. However, 1N6359 operates with 70A peak pulse current (compared to 75A for LCE12) and uses a DO-13 package instead of DO-201. The 1N6359 also features a lower clamping voltage (16.5V), which may provide tighter transient suppression in some applications.

Q: Why is 1N6471 not recommended?

A: The 1N6471 is discontinued at DiGi Electronics and exhibits reduced peak pulse current (66A vs. 75A) compared to the LCE12. Additionally, its higher clamping voltage (22.6V) may not provide adequate transient suppression in applications designed for the LCE12's 20.9V specification.

Q: When should 5KP12E3/TR13 be considered?

A: The 5KP12E3/TR13 is suitable only for applications requiring significantly higher transient energy handling, with 227A peak pulse current and 5000W power dissipation. The P600 package is not compatible with DO-201 footprints, making this a functional substitute only for redesigned circuits.

Q: Are there RoHS compliance considerations?

A: LCE12A and 5KP12E3/TR13 are ROHS3 compliant. The 1N6359 is RoHS non-compliant. For applications requiring RoHS compliance, LCE12A or 5KP12E3/TR13 are appropriate selections.

Q: What is the operating temperature range for these parts?

A: LCE12, LCE12A, and 5KP12E3/TR13 operate from -55°C to 175°C (TJ). The 1N6359 and 1N6471 extend the lower temperature limit to -65°C, providing wider operating range in extreme cold environments.

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