LCE8.5-B Equivalent & Substitute Parts

Part Overview

The LCE8.5-B is a unidirectional Zener-type Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc. in the DO-201 axial package. This component is designed for transient overvoltage protection in telecom applications, with a reverse standoff voltage of 8.5V and peak pulse current handling of 100A at 14.4V clamping voltage.

The LCE8.5-B carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing maintenance and production requirements for systems utilizing this component.

Substiute Parts

LCE8.5-B

Littelfuse Inc.In Stock: 856LCE8.5-B Datasheet

Current PartRFQ

LCE8.5A

Littelfuse Inc.In Stock: 978LCE8.5A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LCE8.5-B is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 8.5V
• Voltage - Clamping (Max) @ Ipp: 14.4V
• Current - Peak Pulse (10/1000µs): 100A
• Power - Peak Pulse: 1500W
• Operating Temperature Range: -55°C to 175°C (TJ)
• Package / Case: DO-201AA, DO-27, Axial
• Type: Zener
• Unidirectional Channels: 1

The LCE8.5-A is a direct manufacturer equivalent produced by Littelfuse Inc. within the same LCE series. This part maintains identical electrical specifications and package configuration while offering Active product status and improved supply availability. The LCE8.5-A differs only in packaging format (Tape & Reel versus bulk) and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

The LCE8.5-A is the primary direct substitute for the obsolete LCE8.5-B. Both components are manufactured by Littelfuse Inc. and share identical electrical performance specifications and mechanical package configuration.

Selection Basis:

The LCE8.5-A offers the following advantages over the LCE8.5-B:

• Product Status: Active product status ensures ongoing manufacturer support, documentation availability, and supply chain continuity.
• Compliance: The LCE8.5-A carries ROHS3 Compliant certification, representing current regulatory compliance standards, compared to the LCE8.5-B's RoHS Compliant designation.
• Supply Availability: Active product status typically correlates with improved inventory availability and lead time predictability.

Both parts maintain identical electrical parameters, operating temperature range, and package specifications. No circuit redesign or board layout modification is required when transitioning from LCE8.5-B to LCE8.5-A.

Frequently Asked Questions (FAQ)

Q: Can the LCE8.5-A be used as a direct replacement for the LCE8.5-B in existing designs?

A: Yes. The LCE8.5-A is electrically and mechanically equivalent to the LCE8.5-B. All electrical parameters, including reverse standoff voltage, clamping voltage, peak pulse current, and operating temperature range, are identical. The DO-201 axial package configuration is the same, requiring no board layout changes.

Q: What is the difference between the LCE8.5-B and LCE8.5-A?

A: The primary differences are product status and packaging format. The LCE8.5-B is Obsolete, while the LCE8.5-A is Active. The LCE8.5-B is supplied in standard packaging, while the LCE8.5-A is supplied in Tape & Reel format. The LCE8.5-A also carries ROHS3 Compliant certification versus RoHS Compliant for the LCE8.5-B. Electrical specifications are identical.

Q: Are there any thermal or performance differences between these parts?

A: No. Both parts operate across the same temperature range (-55°C to 175°C TJ) and deliver identical peak pulse power (1500W) and current handling (100A at 10/1000µs).

Q: What does the DO-201 package designation mean?

A: DO-201 is an axial through-hole package format for discrete components. Both the LCE8.5-B and LCE8.5-A use this package, also referenced as DO-201AA or DO-27. This package type is suitable for through-hole PCB mounting.

Q: Is the LCE8.5-A suitable for telecom applications?

A: The LCE8.5-A is rated for General Purpose applications according to the provided specifications. The LCE8.5-B was specifically designated for Telecom applications. Both parts meet the same electrical and thermal requirements; however, application-specific validation should be performed based on system requirements.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: Both the LCE8.5-B and LCE8.5-A carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.