P4KE20-B Equivalent & Substitute Parts

Part Overview

The P4KE20-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 17.1V reverse standoff voltage with a 29.09V maximum clamping voltage and 400W peak pulse power rating in a through-hole DO-204AL (DO-41) axial package. The P4KE20-B is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across voltage ratings, power dissipation, thermal operating range, and mechanical package specifications.

Substiute Parts

P4KE20-B

Littelfuse Inc.In Stock: 970P4KE20-B Datasheet

Current PartRFQ

P4KE20A

Diotec SemiconductorIn Stock: 1176P4KE20A Datasheet

DirectRFQ

P4KE20A-B

Littelfuse Inc.In Stock: 954P4KE20A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE20-B are qualified based on the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 17.1V (exact match required)
• Voltage - Breakdown (Min): 18V or higher
• Voltage - Clamping (Max) @ Ipp: within acceptable range for circuit protection
• Current - Peak Pulse (10/1000µs): 14.8A or higher
• Power - Peak Pulse: 400W minimum
• Operating Temperature Range: -55°C to 175°C or equivalent
• Mounting Type: Through Hole
• Package / Case: DO-204AL (DO-41) or DO-204AC (DO-15) axial packages
• Type: Zener, Unidirectional (1 channel)

Substitutes must maintain the same base product number (P4KE20) and support general-purpose transient voltage suppression applications. Package variations between DO-204AL and DO-204AC are acceptable provided mechanical compatibility is verified in the target application.

Parameter Comparison

Engineering Selection Recommendations

P4KE20A-B (Littelfuse Inc.) is the primary substitute for P4KE20-B. Both components are manufactured by Littelfuse Inc., share identical package specifications (DO-204AL, DO-41), and maintain the same operating temperature range (-55°C to 175°C). P4KE20A-B is currently in active production status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. The clamping voltage is slightly lower (27.7V vs. 29.09V), which provides enhanced protection margins in most general-purpose applications.

P4KE20A (Diotec Semiconductor) serves as a secondary substitute. This component maintains equivalent electrical performance with 17.1V reverse standoff voltage and 400W power rating. The primary consideration is the package variant: P4KE20A uses DO-204AC (DO-15) instead of DO-204AL (DO-41). This package difference requires mechanical verification for PCB footprint compatibility. Additionally, P4KE20A operates across a slightly narrower temperature range (-50°C to 175°C) compared to the original specification. Diotec's active product status ensures availability.

Both substitutes are qualified based on product status (active vs. obsolete), regulatory compliance certifications, and electrical parameter alignment within acceptable engineering tolerances for transient voltage suppression applications.

Frequently Asked Questions (FAQ)

Q: Can P4KE20A replace P4KE20-B directly without PCB modifications?

A: P4KE20A uses a DO-204AC (DO-15) package, while P4KE20-B uses DO-204AL (DO-41). Although both are axial through-hole packages, the physical dimensions differ. Direct replacement requires verification that the PCB footprint accommodates the DO-15 package spacing. P4KE20A-B is the direct package-compatible substitute.

Q: What is the significance of the clamping voltage difference between P4KE20-B (29.09V) and the substitutes (27.7V)?

A: Lower clamping voltage provides tighter voltage regulation and enhanced transient suppression. For general-purpose applications, 27.7V clamping is within acceptable protection parameters. Circuit-specific requirements should be verified against the application's maximum allowable voltage threshold.

Q: Why is P4KE20-B classified as obsolete?

A: Obsolescence indicates the manufacturer has discontinued production. P4KE20A and P4KE20A-B are active alternatives that fulfill the same functional requirements with equivalent electrical specifications.

Q: Are there temperature range considerations when substituting P4KE20A?

A: P4KE20A operates from -50°C to 175°C, compared to P4KE20-B's -55°C to 175°C range. If the application requires operation below -50°C, P4KE20A-B is the appropriate substitute, as it maintains the full -55°C to 175°C range.

Q: What compliance certifications should be verified for new designs?

A: Both P4KE20A-B and P4KE20-B carry ROHS3 compliance. P4KE20A-B also maintains REACH Unaffected status. Verify compliance requirements against your specific regulatory framework before final component selection.

Q: Are all three parts (P4KE20-B, P4KE20A, P4KE20A-B) interchangeable in the same circuit?

A: Electrical interchangeability is confirmed across all three parts for general-purpose transient voltage suppression. Package compatibility must be verified: P4KE20-B and P4KE20A-B use DO-204AL (DO-41), while P4KE20A uses DO-204AC (DO-15). Mechanical footprint verification is required before substitution.