P4KE440-B Equivalent & Substitute Parts

Part Overview

The P4KE440-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 376V reverse standoff voltage with a 632.1V maximum clamping voltage and 680mA peak pulse current capability in a through-hole DO-204AL (DO-41) package format.

The P4KE440-B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this TVS diode specification.

Substiute Parts

P4KE440-B

Littelfuse Inc.In Stock: 1017P4KE440-B Datasheet

Current PartRFQ

P4KE440A

Taiwan Semiconductor CorporationIn Stock: 300467P4KE440A Datasheet

DirectRFQ

P4KE440A-B

Littelfuse Inc.In Stock: 775P4KE440A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE440-B are qualified based on the following electrical and mechanical parameters:

• Reverse standoff voltage: 376V (typical)
• Breakdown voltage minimum: 396V or higher
• Clamping voltage maximum: within acceptable range for the application (600V to 632.1V)
• Peak pulse current: 680mA to 690mA
• Peak pulse power: 400W
• Operating temperature range: -55°C to 175°C (TJ)
• Package type: DO-204AL (DO-41) through-hole axial configuration
• Zener diode type, unidirectional channel configuration

The identified substitute parts maintain electrical compatibility within these parameters while offering improved product status and supply availability.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts—P4KE440A and P4KE440A-B—are classified as active products, providing improved long-term availability compared to the obsolete P4KE440-B. Both substitutes maintain full compliance with ROHS3 requirements and carry MSL rating of 1 (Unlimited).

P4KE440A-B, manufactured by Littelfuse Inc., maintains the original manufacturer lineage and is available in bulk packaging with 696 units in stock. This part is suitable for applications requiring continuity with the original design source.

P4KE440A, manufactured by Taiwan Semiconductor Corporation, is available in tape and reel packaging with significantly higher inventory (300,400 units), supporting high-volume production requirements. This part is suitable for applications where supply volume and packaging format are primary considerations.

Both parts exhibit clamping voltages (600V and 602V respectively) that are lower than the main part (632.1V), representing a more conservative voltage suppression characteristic. This difference must be evaluated against specific circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can P4KE440A and P4KE440A-B be used interchangeably with P4KE440-B?

A: Both parts maintain the same reverse standoff voltage (376V), peak pulse power (400W), operating temperature range (-55 to 175°C), and package configuration (DO-204AL through-hole). The primary electrical difference is the clamping voltage: P4KE440A and P4KE440A-B clamp at 600V and 602V respectively, compared to 632.1V for the P4KE440-B. Interchangeability depends on whether the lower clamping voltage is acceptable for the specific circuit protection application.

Q: What is the difference between P4KE440A and P4KE440A-B?

A: Both parts share identical electrical specifications. The primary differences are manufacturer (Taiwan Semiconductor Corporation vs. Littelfuse Inc.), packaging format (tape and reel vs. bulk), and inventory availability (300,400 units vs. 696 units). Selection should be based on supply chain requirements and packaging compatibility with assembly processes.

Q: Are all substitute parts RoHS compliant?

A: Yes. The P4KE440-B, P4KE440A, and P4KE440A-B are all ROHS3 compliant with MSL rating of 1 (Unlimited), meeting environmental and regulatory requirements for electronic component applications.

Q: What is the significance of the clamping voltage difference?

A: The P4KE440-B clamps at 632.1V maximum, while substitutes clamp at 600V to 602V. Lower clamping voltage provides more aggressive overvoltage suppression. Circuit designers must verify that the lower clamping voltage does not exceed component voltage ratings in the protected circuit.

Q: Which substitute part should be selected for new designs?

A: Selection between P4KE440A and P4KE440A-B should be based on supply chain strategy, packaging requirements, and manufacturer preference. Both parts are active products with full compliance certifications. High-volume applications may benefit from P4KE440A due to superior inventory availability.