Equivalent & Substitute Parts for 3KP6.5C-B TVS Diode

Part Overview

The 3KP6.5C-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This bidirectional Zener diode features a 6.5V reverse standoff voltage and 11.76V maximum clamping voltage with 267.9A peak pulse current capability. The part is classified as obsolete, making equivalent or substitute components necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal specifications while accommodating available packaging options.

Substiute Parts

3KP6.5C-B

Littelfuse Inc.In Stock: 8583KP6.5C-B Datasheet

Current PartRFQ

5KP6.5CA-B

Littelfuse Inc.In Stock: 10635KP6.5CA-B Datasheet

DirectRFQ

3KP6.5CA-TP

Micro Commercial CoIn Stock: 7053KP6.5CA-TP Datasheet

MFR RecommendedRFQ

5KP6.5CA-TP

Micro Commercial CoIn Stock: 20865KP6.5CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP6.5C-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must equal 6.5V
• Voltage - Clamping (Max) @ Ipp: Must be within acceptable range (11.76V nominal for main part; 11.2V acceptable for substitutes with equivalent or higher current rating)
• Current - Peak Pulse (10/1000µs): Must meet or exceed 267.9A
• Power - Peak Pulse: Must meet or exceed 3000W
• Operating Temperature Range: Must span -55°C to 175°C (TJ)
• Mounting Type: Through Hole required
• Type: Zener diode, bidirectional, single channel
• RoHS Compliance: ROHS3 Compliant required

Substitute parts are grouped into two categories: direct manufacturer alternatives (Littelfuse 5KP series) and manufacturer-recommended alternatives (Micro Commercial Co equivalents). All candidates maintain the 6.5V standoff voltage and general-purpose application profile while offering enhanced current and power ratings or alternative packaging configurations.

Parameter Comparison

Engineering Selection Recommendations

5KP6.5CA-B (Littelfuse Inc.) is the primary direct substitute. This part maintains the P600 axial package, shares identical voltage specifications, and is currently in active production status. The 5KP series offers enhanced current handling (455.4A versus 267.9A) and increased power dissipation (5000W versus 3000W), providing superior transient protection margins. ROHS3 compliance and unlimited moisture sensitivity rating ensure regulatory and environmental compatibility.

3KP6.5CA-TP (Micro Commercial Co) provides an alternative with matched electrical performance at the 3KP power level (3000W, 267.9A). This part is active and REACH-unaffected. The R-6 package differs from the original P600, requiring PCB layout verification for mechanical fit.

5KP6.5CA-TP (Micro Commercial Co) offers the highest performance option with 5000W power rating and active product status. Like the 3KP6.5CA-TP, it uses the R-6 package instead of P600. ROHS3 compliance and REACH-unaffected status support regulatory requirements.

All substitute candidates maintain the 6.5V reverse standoff voltage, -55°C to 175°C operating range, and through-hole mounting configuration essential for functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can the 5KP6.5CA-B replace the 3KP6.5C-B directly?

A: Yes. Both parts share identical voltage ratings (6.5V standoff, 11.2V to 11.76V clamping), the same P600 axial package, and compatible thermal specifications. The 5KP series provides higher current and power ratings, making it a direct upgrade-capable substitute.

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

A: Both are axial through-hole packages for TVS diodes. P600 and R-6 differ in physical dimensions and lead spacing. PCB layout and component placement must be verified when switching between these packages to ensure mechanical compatibility.

Q: Why do some substitute parts show different clamping voltages?

A: The 3KP6.5C-B specifies 11.76V maximum clamping, while 5KP variants specify 11.2V. Both values fall within acceptable protection ranges for 6.5V standoff devices. The lower clamping voltage in 5KP parts reflects improved device design and does not compromise circuit protection.

Q: Are all substitute parts RoHS compliant?

A: The Littelfuse 5KP6.5CA-B and Micro Commercial Co 5KP6.5CA-TP are explicitly ROHS3 compliant. The 3KP6.5CA-TP does not list RoHS status in the provided data; verify compliance with the manufacturer before selection if RoHS certification is required.

Q: What does "Current - Peak Pulse (10/1000µs)" represent?

A: This parameter specifies the maximum peak current the TVS diode can handle during a 10/1000 microsecond transient pulse. Higher values indicate greater transient suppression capability. The 3KP6.5C-B handles 267.9A; the 5KP series handles 455.4A.

Q: Can I use a substitute with higher power rating in a design rated for 3000W?

A: Yes. A substitute with equal or higher power rating (5000W) is electrically compatible and provides additional safety margin. No circuit redesign is required when upgrading to higher-rated components with identical voltage specifications.