3KP190 Equivalent & Substitute Parts

Part Overview

The 3KP190 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. It features a 190V reverse standoff voltage with a maximum clamping voltage of 325.5V at peak pulse current. The device is packaged in a P600 axial through-hole configuration and operates across a temperature range of -55°C to 175°C.

The 3KP190 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 component.

Substiute Parts

3KP190

Littelfuse Inc.In Stock: 7323KP190 Datasheet

Current PartRFQ

5KP190A

Littelfuse Inc.In Stock: 8235KP190A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP190 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): Must match 190V
• Voltage - Clamping (Max) @ Ipp: Must be within acceptable operating range for the protected circuit
• Current - Peak Pulse (10/1000µs): Must meet or exceed application requirements
• Power - Peak Pulse: Must support the transient energy dissipation profile
• Type: Zener unidirectional configuration

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: P600, Axial
• Operating Temperature Range: -55°C ~ 175°C (TJ)

Compliance Criteria:

• RoHS Status: ROHS3 Compliant

The 5KP190A qualifies as a direct substitute based on matching reverse standoff voltage (190V), identical package configuration (P600 axial through-hole), matching operating temperature range, and equivalent RoHS compliance status. The 5KP190A is an active product from the same manufacturer, providing improved availability compared to the obsolete 3KP190.

Parameter Comparison

Engineering Selection Recommendations

The 5KP190A is the qualified substitute for the 3KP190 based on the following factors:

Product Status: The 5KP190A is an active product from Littelfuse Inc., ensuring ongoing availability and supply chain support. The 3KP190 is obsolete, making the 5KP190A the appropriate choice for new designs and production continuity.

Compliance: Both devices maintain ROHS3 compliance, satisfying regulatory requirements for electronic component procurement.

Electrical Performance: The 5KP190A provides enhanced performance characteristics with higher peak pulse current (16.5A versus 9.7A) and greater peak pulse power dissipation (5000W versus 3000W). The clamping voltage is lower (310V versus 325.5V), providing improved transient suppression. Both devices share the identical reverse standoff voltage of 190V, ensuring circuit protection thresholds remain consistent.

Mechanical Compatibility: Identical P600 axial through-hole packaging ensures direct physical and electrical compatibility without PCB redesign or rework.

Frequently Asked Questions (FAQ)

Q: Can the 5KP190A be used as a direct replacement for the 3KP190 without circuit modifications?

A: Yes. Both devices share identical reverse standoff voltage (190V), package configuration (P600 axial), and operating temperature range (-55°C to 175°C). The 5KP190A provides superior performance with higher current and power ratings, making it functionally compatible for the same protection applications.

Q: What are the key differences between the 3KP190 and 5KP190A?

A: The primary differences are product status (obsolete versus active), peak pulse current (9.7A versus 16.5A), peak pulse power (3000W versus 5000W), and clamping voltage (325.5V versus 310V). The 5KP190A offers enhanced transient suppression capability while maintaining the same reverse standoff voltage and package form factor.

Q: Are there any packaging differences between these devices?

A: No. Both the 3KP190 and 5KP190A use the P600 axial through-hole package configuration. The 5KP190A is supplied in Tape & Reel (TR) packaging for automated assembly, while the 3KP190 was supplied in standard packaging. This does not affect electrical or mechanical compatibility.

Q: Do both devices meet the same compliance standards?

A: Yes. Both the 3KP190 and 5KP190A are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Q: Why does the 5KP190A have a lower clamping voltage than the 3KP190?

A: The 5KP190A's lower maximum clamping voltage (310V versus 325.5V) represents improved transient suppression performance. This lower clamping voltage, combined with higher current handling capability, provides more effective protection against voltage transients while maintaining the same reverse standoff threshold.