LCE8.5 Equivalent & Substitute Parts

Part Overview

The LCE8.5 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 8.5V reverse standoff voltage with a 15.12V maximum clamping voltage at 100A peak pulse current. The device is packaged in DO-201AA through-hole format and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical characteristics while offering improved availability and active manufacturer support.

Key Parameters

Parameter	LCE8.5
Voltage - Reverse Standoff (Typ)	8.5V
Voltage - Breakdown (Min)	8.93V
Voltage - Clamping (Max) @ Ipp	15.12V
Current - Peak Pulse (10/1000µs)	100A
Power - Peak Pulse	1500W (1.5kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-201AA, DO-27, Axial
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LCE8.5 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Voltage - Reverse Standoff (Typ): 8.5V ± tolerance
Voltage - Clamping (Max) @ Ipp: 14.4V to 15.9V range
Current - Peak Pulse (10/1000µs): 43A to 314A
Power - Peak Pulse: 600W to 5000W
Mounting Type: Through Hole
Type: Zener, Unidirectional
Operating Temperature: -55°C to -50°C minimum, 175°C maximum
RoHS Status: ROHS3 Compliant

Substitutes are divided into two categories: direct replacements maintaining identical electrical performance within tight tolerances, and functional equivalents with comparable voltage regulation characteristics but different current handling or package formats.

Parameter Comparison

Parameter	LCE8.5	LCE8.5A	1.5KE10A	P6KE10A	1.5KE10A-E3/54	1.5KE10AHE3_A/C	1N5633A	1N6271A-E3/73	5KP8.5E3/TR13
Voltage - Reverse Standoff (Typ)	8.5V	8.5V	8.55V	8.5V	8.55V	8.55V	8.55V	8.55V	8.5V
Voltage - Breakdown (Min)	8.93V	9.44V	9.5V	9.5V	9.5V	9.5V	9.5V	9.5V	9.44V
Voltage - Clamping (Max) @ Ipp	15.12V	14.4V	14.5V	14.5V	14.5V	14.5V	14.5V	14.5V	15.9V
Current - Peak Pulse (10/1000µs)	100A	100A	108A	43A	103A	103A	103A	103A	314A
Power - Peak Pulse	1500W	1500W	1500W	600W	1500W	1500W	1500W	1500W	5000W
Operating Temperature	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-50°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-65°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AA, DO-27	DO-201AA, DO-27	DO-201AA, DO-27	DO-204AC, DO-15	DO-201AA, DO-27	DO-201AA, DO-27	DO-13	DO-201AA, DO-27	P600
Type	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1	1	1	1	1
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Same Manufacturer): LCE8.5A from Littelfuse Inc. is the primary direct substitute, maintaining identical reverse standoff voltage (8.5V), peak pulse current (100A), and power rating (1500W). LCE8.5A is active and available in tape & reel packaging, offering improved supply continuity over the obsolete LCE8.5.

Primary Functional Equivalents: The 1.5KE10A series from Taiwan Semiconductor Corporation, 1.5KE10A-E3/54 from Vishay, and 1N6271A-E3/73 from Vishay provide equivalent electrical performance with 8.55V reverse standoff, 14.5V clamping voltage, and 103A peak pulse current. All three maintain 1500W power rating and -55°C to 175°C operating temperature range. These parts are active and ROHS3 compliant.

Automotive Grade Option: 1.5KE10AHE3_A/C from Vishay is qualified to AEC-Q101 automotive standard, suitable for applications requiring automotive-grade components. Electrical specifications match the 1.5KE10A series.

Alternative Package Consideration: P6KE10A from Fairchild Semiconductor provides functional equivalence with 8.5V reverse standoff and 14.5V clamping voltage but in DO-15 package format with reduced peak pulse current (43A) and power rating (600W). This part is suitable only for applications with lower current requirements.

High-Power Alternative: 5KP8.5E3/TR13 from Microchip Technology offers the same 8.5V reverse standoff voltage with significantly higher current handling (314A) and power dissipation (5000W) in P600 package. This part is suitable for high-energy transient suppression applications.

Extended Temperature Range: 1N5633A from Solid State Inc. provides -65°C minimum operating temperature, extending the lower temperature range compared to the LCE8.5 specification of -55°C.

Frequently Asked Questions (FAQ)

Q: Can LCE8.5A be used as a direct replacement for LCE8.5? A: Yes. LCE8.5A maintains the same reverse standoff voltage (8.5V), peak pulse current (100A), and power rating (1500W). The primary difference is clamping voltage (14.4V vs. 15.12V), which falls within acceptable substitution tolerance for general-purpose transient suppression. LCE8.5A is active and recommended for new designs.

Q: What is the difference between 1.5KE10A and 1.5KE10A-E3/54? A: Both parts share identical electrical specifications (8.55V reverse standoff, 14.5V clamping, 103A peak pulse). The suffix designates packaging and tape configuration. 1.5KE10A-E3/54 is supplied in cut tape format, while 1.5KE10A may have different packaging options. Selection depends on assembly process requirements.

Q: Is P6KE10A suitable as a substitute for LCE8.5? A: P6KE10A is functionally equivalent in voltage characteristics (8.5V reverse standoff, 14.5V clamping) but has reduced current capacity (43A vs. 100A) and power rating (600W vs. 1500W). It is suitable only for applications with lower transient energy requirements. Package format is also different (DO-15 vs. DO-201).

Q: Why does 5KP8.5E3/TR13 have higher clamping voltage (15.9V) than LCE8.5 (15.12V)? A: The 5KP8.5E3/TR13 is designed for higher power dissipation (5000W vs. 1500W) and higher peak pulse current (314A vs. 100A). The slightly elevated clamping voltage is a characteristic of the higher-power package design. This part is suitable for high-energy transient suppression where the additional voltage margin is acceptable.

Q: Are all substitute parts ROHS3 compliant? A: All substitute parts listed are ROHS3 compliant except P6KE10A, for which RoHS status is not specified in the provided data. Verify RoHS compliance with the manufacturer if required for your application.

Q: What is the significance of the AEC-Q101 qualification on 1.5KE10AHE3_A/C? A: AEC-Q101 is an automotive industry qualification standard. The 1.5KE10AHE3_A/C is qualified to this standard, making it suitable for automotive applications requiring certified component reliability and quality assurance. Non-automotive parts do not carry this qualification.

Q: Can I use 1N5633A in place of LCE8.5 if my application requires extended low-temperature operation? A: 1N5633A extends the minimum operating temperature to -65°C compared to LCE8.5 at -55°C. However, the package format is DO-13, which differs from LCE8.5's DO-201. Verify PCB layout compatibility before substitution. Electrical specifications (8.55V reverse standoff, 14.5V clamping, 103A peak pulse) are equivalent.

Q: What packaging options are available for the substitute parts? A: Substitute parts are available in multiple packaging formats: DO-201AA/DO-27 (1.5KE series, 1N6271A), DO-15 (P6KE10A), DO-13 (1N5633A), and P600 (5KP8.5E3/TR13). Selection depends on PCB design and assembly equipment compatibility. Tape & reel packaging is available for high-volume production.

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