P4KE18C-E3/73 Equivalent & Substitute Parts

Part Overview

The P4KE18C-E3/73 is a transient voltage suppressor (TVS) diode from Vishay's TransZorb® series, designed for general-purpose overvoltage protection applications. This component features a 14.5V reverse standoff voltage with a 26.5V maximum clamping voltage and 15.1A peak pulse current capability in a through-hole DO-204AL (DO-41) axial package. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

P4KE18C-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 849P4KE18C-E3/73 Datasheet

Current PartRFQ

P4KE18CA-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 1143P4KE18CA-E3/73 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4KE18C-E3/73 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reverse standoff voltage within acceptable tolerance of 14.5V
• Breakdown voltage minimum at or above 16.2V
• Clamping voltage maximum at or below 26.5V
• Peak pulse current capability at or above 15.1A
• Peak pulse power rating at or above 400W
• Operating temperature range encompassing -55°C to 175°C

Mechanical Compatibility Criteria:

• Through-hole mounting configuration
• DO-204AL (DO-41) axial package format
• Bidirectional single-channel configuration

Compliance and Status Criteria:

• ROHS3 compliance maintained
• MSL rating of 1 or equivalent
• Active or current product status preferred for long-term availability

The P4KE18CA-E3/73 qualifies as a direct substitute based on these parameters, with minor variations in standoff and clamping voltages that remain within acceptable operational margins for general-purpose TVS applications.

Parameter Comparison

Engineering Selection Recommendations

The P4KE18CA-E3/73 is the primary substitute for the obsolete P4KE18C-E3/73. Selection is justified on the following basis:

Product Status: The P4KE18CA-E3/73 maintains active product status with Vishay, ensuring continued availability and manufacturing support. The original P4KE18C-E3/73 is classified as obsolete, creating supply chain risk for new designs and ongoing production.

Compliance Alignment: Both components maintain ROHS3 compliance and MSL rating of 1 (Unlimited), ensuring compatibility with current manufacturing and environmental standards. No compliance degradation occurs with substitution.

Electrical Performance: The P4KE18CA-E3/73 delivers equivalent or superior electrical performance across all critical parameters. The slightly elevated reverse standoff voltage (15.3V vs. 14.5V) and breakdown voltage (17.1V vs. 16.2V) provide enhanced protection margins. The reduced clamping voltage (25.2V vs. 26.5V) offers improved transient suppression. Peak pulse current capability increases from 15.1A to 15.9A, maintaining the 400W power rating.

Mechanical Compatibility: Identical through-hole mounting configuration and DO-204AL (DO-41) axial package format ensure direct physical and electrical interchangeability without circuit board modifications.

Frequently Asked Questions (FAQ)

Q: Can the P4KE18CA-E3/73 be used as a direct replacement for P4KE18C-E3/73 without circuit modifications?

A: Yes. Both components share identical mechanical packaging (DO-204AL, DO-41 axial), mounting type (through-hole), and operating temperature range (-55°C to 175°C). Electrical parameters are within acceptable substitution tolerances for general-purpose TVS applications. No circuit board layout changes are required.

Q: What are the key electrical differences between these two parts?

A: The P4KE18CA-E3/73 has a slightly higher reverse standoff voltage (15.3V vs. 14.5V) and breakdown voltage (17.1V vs. 16.2V), but a lower maximum clamping voltage (25.2V vs. 26.5V). Peak pulse current capability is marginally higher (15.9A vs. 15.1A). These differences represent normal manufacturing variation within the TransZorb® series and do not affect functional compatibility in general-purpose protection circuits.

Q: Why is the original P4KE18C-E3/73 classified as obsolete?

A: Product obsolescence is determined by the manufacturer based on market demand, production economics, and product line consolidation. The P4KE18CA-E3/73 represents the current active equivalent within Vishay's TransZorb® portfolio, offering equivalent or improved performance characteristics.

Q: Are there any compliance or certification differences between these parts?

A: No. Both components maintain identical ROHS3 compliance status and MSL rating of 1 (Unlimited). No compliance degradation or additional certifications are required when substituting the P4KE18CA-E3/73 for the P4KE18C-E3/73.

Q: What is the difference between the P4KE18CA-E3/73 and other variants listed in the substitute family (P4KE18CA, P4KE18CAHE3/73, P6KE18CA)?

A: The P4KE18CA-E3/73 is the direct equivalent with identical electrical ratings and packaging. Other variants in the substitute family (P4KE18CA, P4KE18CAHE3/73, P6KE18CA) represent alternative configurations within the TransZorb® series with different voltage or current ratings. Selection among these variants depends on specific circuit protection requirements and voltage clamping specifications.

Q: Can the P4KE18CA-E3/73 be used in applications requiring the exact original specifications of the P4KE18C-E3/73?

A: Yes, for general-purpose transient voltage suppression applications. The electrical parameter variations are within normal manufacturing tolerances and do not affect circuit performance in standard overvoltage protection configurations. Applications with strict voltage tolerance requirements should verify that the slightly elevated standoff and breakdown voltages, combined with the reduced clamping voltage, remain acceptable for the specific circuit design.