MLCE40AE3 Equivalent & Substitute Parts

Part Overview

The MLCE40AE3 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose transient voltage protection applications. This through-hole component operates with a 40V reverse standoff voltage and provides 64.5V maximum clamping voltage at peak pulse current. The part is currently active in production and maintains military-grade qualification under MIL-PRF-19500. Substitute parts are identified to address packaging format preferences, compliance requirements, or inventory availability while maintaining electrical equivalence.

Substiute Parts

MLCE40AE3

Microchip TechnologyIn Stock: 898MLCE40AE3 Datasheet

Current PartRFQ

LCE40A

Littelfuse Inc.In Stock: 3012LCE40A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MLCE40AE3 with the LCE40A is based on electrical parameter equivalence across all critical transient suppression characteristics. Both parts maintain identical voltage ratings (40V reverse standoff, 44.4V minimum breakdown, 64.5V maximum clamping) and current handling specifications (23.3A peak pulse current, 1500W peak pulse power). Both components are unidirectional Zener TVS diodes with through-hole mounting in DO-201AA/DO-27 axial packages.

The primary differences between these parts are:

• Manufacturer: Microchip Technology (MLCE40AE3) versus Littelfuse Inc. (LCE40A)
• Packaging Format: Bulk versus Cut Tape (CT)
• Operating Temperature Upper Limit: 150°C (MLCE40AE3) versus 175°C (LCE40A)
• RoHS Compliance: Non-compliant (MLCE40AE3) versus ROHS3 Compliant (LCE40A)
• Capacitance Specification: 100pF @ 1MHz (MLCE40AE3) versus not specified (LCE40A)

These differences do not affect electrical substitution for general-purpose transient voltage suppression applications where the specified voltage and current parameters are the determining factors.

Parameter Comparison

Engineering Selection Recommendations

MLCE40AE3 (Microchip Technology) is the primary selection for applications requiring military-grade qualification under MIL-PRF-19500. This part carries military-grade certification and is suitable for defense and aerospace applications where this qualification is mandatory. The part is available in bulk packaging and provides specified capacitance characteristics (100pF @ 1MHz).

LCE40A (Littelfuse Inc.) is the appropriate substitute for applications requiring RoHS3 compliance or extended operating temperature range to 175°C. This part is available in Cut Tape packaging format, which may be preferred for automated assembly processes. The LCE40A maintains full electrical equivalence for transient voltage suppression performance while offering improved environmental compliance status.

Both parts are active products with established supply chains. Selection between them depends on specific compliance requirements (military qualification versus RoHS3), packaging format needs (bulk versus cut tape), and operating temperature requirements within the specified ranges.

Frequently Asked Questions (FAQ)

Q: Are MLCE40AE3 and LCE40A electrically interchangeable?

A: Yes. Both parts are unidirectional Zener TVS diodes with identical voltage ratings (40V reverse standoff, 44.4V breakdown minimum, 64.5V clamping maximum) and current specifications (23.3A peak pulse, 1500W peak power). They are electrically equivalent for general-purpose transient voltage suppression applications.

Q: What is the difference in operating temperature range?

A: The MLCE40AE3 operates from -65°C to 150°C junction temperature, while the LCE40A operates from -65°C to 175°C. For applications requiring operation above 150°C, the LCE40A is the appropriate selection.

Q: Why does the MLCE40AE3 have military qualification while LCE40A does not?

A: The MLCE40AE3 carries MIL-PRF-19500 military-grade qualification, making it suitable for defense and aerospace applications where this certification is required. The LCE40A is a commercial-grade equivalent without military qualification. Selection depends on application requirements.

Q: What is the significance of RoHS compliance difference?

A: The MLCE40AE3 is RoHS non-compliant, while the LCE40A is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements for lead-free and restricted substance compliance, the LCE40A is the required selection.

Q: Does packaging format affect electrical performance?

A: No. The MLCE40AE3 is supplied in bulk packaging, while the LCE40A is supplied in Cut Tape (CT) format. Both use identical DO-201AA/DO-27 axial through-hole packages. Packaging format affects supply chain logistics and assembly automation compatibility, not electrical performance.

Q: Can I use LCE40A in a design originally specified for MLCE40AE3?

A: Substitution is permissible for applications where military qualification is not required. Verify that the extended operating temperature range of the LCE40A (to 175°C) does not create thermal management conflicts in your design. Confirm that RoHS3 compliance aligns with your application requirements.

Q: Is capacitance specification important for substitution?

A: The MLCE40AE3 specifies 100pF @ 1MHz capacitance, while the LCE40A does not provide this specification. For applications where TVS diode capacitance affects circuit performance (high-frequency signal integrity), verify that the LCE40A meets your capacitance requirements before substitution.