5KP33A-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 5KP33A-B is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This unidirectional zener diode operates with a 33V reverse standoff voltage and provides peak pulse power dissipation of 5000W, making it suitable for protecting sensitive electronic circuits from transient voltage events. The component is currently in active production status with 867 units in stock, classified as ROHS3 compliant and REACH unaffected. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the TVS diode category.

Substiute Parts

5KP33A-B

Littelfuse Inc.In Stock: 9185KP33A-B Datasheet

Current PartRFQ

5KP33A

Diotec SemiconductorIn Stock: 43285KP33A Datasheet

MFR RecommendedRFQ

5KP33A-TP

Micro Commercial CoIn Stock: 12205KP33A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5KP33A-B are identified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 33V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 53.3V (exact match required)
• Power - Peak Pulse: 5000W (exact match required)
• Mounting Type: Through Hole (required for mechanical compatibility)
• Type: Zener, Unidirectional (functional equivalence)
• Category: Transient Voltage Suppressors (TVS)

Substitutes must maintain identical voltage ratings and power dissipation capability to ensure equivalent circuit protection performance. Package variations (P600 vs. R-6) are acceptable provided the through-hole mounting configuration is preserved and the component footprint is compatible with the application PCB layout.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain identical voltage specifications (33V reverse standoff, 53.3V clamping) and power dissipation (5000W peak pulse), confirming electrical equivalence for circuit protection applications.

The 5KP33A (Diotec Semiconductor) provides direct substitution with matching P600 axial package geometry. Peak pulse current is specified at 94A, marginally lower than the 95.7A of the main part, but within acceptable tolerance for general-purpose TVS applications. Operating temperature minimum is -50°C versus -55°C for the main part. RoHS and REACH compliance status differs; Diotec lists these as not applicable or vendor undefined.

The 5KP33A-TP (Micro Commercial Co) offers electrical equivalence with identical voltage and power ratings. This part maintains the full operating temperature range (-55 to 175°C) and carries ROHS3 and REACH certifications matching the main part. The package variant is R-6 axial instead of P600; both are through-hole configurations with similar physical dimensions suitable for standard PCB layouts. Peak pulse current is not specified for this variant.

Selection between substitutes depends on compliance requirements, package availability, and thermal operating range constraints. For applications requiring full temperature range operation and regulatory compliance documentation, the 5KP33A-TP is preferred. For direct package matching with established supply chain, the 5KP33A is suitable.

Frequently Asked Questions (FAQ)

Q: Can the 5KP33A (Diotec) be used as a direct replacement for the 5KP33A-B?

A: Yes. Both parts share identical voltage ratings (33V standoff, 53.3V clamping) and power dissipation (5000W). The P600 axial package is identical. Peak pulse current differs marginally (94A vs. 95.7A), which does not affect circuit protection performance in general-purpose applications. Verify RoHS and REACH compliance requirements for your application, as Diotec lists these as not applicable or vendor undefined.

Q: What is the difference between the P600 and R-6 packages?

A: Both P600 and R-6 are through-hole axial packages for TVS diodes. P600 and R-6 represent different package designations from different manufacturers but maintain compatible physical dimensions and lead spacing for standard PCB footprints. Verify mechanical compatibility with your specific PCB layout before substitution.

Q: Does the operating temperature range difference (-50°C vs. -55°C minimum) affect substitution?

A: The 5KP33A (Diotec) has a minimum operating temperature of -50°C, while the main part and 5KP33A-TP support -55°C. If your application requires operation below -50°C, use the 5KP33A-TP or the original 5KP33A-B. For standard industrial applications with minimum temperatures above -50°C, the Diotec part is suitable.

Q: Is peak pulse current specification critical for substitution?

A: Peak pulse current (95.7A, 94A, or unspecified) indicates the maximum transient current the diode can handle. All three parts are rated for 5000W peak pulse power at the specified voltage. Marginal differences in peak current do not affect protection performance in circuits where the transient energy is within the 5000W specification. Verify that your circuit's transient energy profile does not exceed this limit.

Q: Are there any compliance or certification differences I should consider?

A: The 5KP33A-B and 5KP33A-TP are both ROHS3 compliant and REACH unaffected. The 5KP33A (Diotec) lists RoHS and REACH status as not applicable or vendor undefined. If your application requires documented RoHS3 or REACH compliance, select the 5KP33A-TP or original part.