Equivalent & Substitute Parts for 3KP14-B TVS Diode

Part Overview

The 3KP14-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This part features a 14V reverse standoff voltage with a 24.36V maximum clamping voltage and 129.3A peak pulse current capability in a through-hole P600 axial package. The 3KP14-B is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Suitable alternatives maintain the same voltage rating, thermal operating range, and mechanical compatibility while offering active product status from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	14	V
Voltage - Breakdown (Min)	14.76	V
Voltage - Clamping (Max) @ Ipp	24.36	V
Current - Peak Pulse (10/1000µs)	129.3	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 3KP14-B are qualified based on the following critical parameters:

Voltage Rating Match: Reverse standoff voltage of 14V and breakdown voltage minimum of 14.76V to 15.6V
Clamping Voltage Compatibility: Maximum clamping voltage between 23.2V and 25.8V at peak pulse current
Package Compatibility: Through-hole axial mounting in P600 or equivalent R-6 package
Thermal Range: Operating temperature range of -55°C to 175°C (TJ)
Zener Type: Unidirectional TVS diode configuration with single channel
Compliance: ROHS3 compliance and EAR99 export classification

Substitute parts are grouped into two categories: direct replacements with identical P600 packaging and compatible alternatives with R-6 packaging that maintain electrical equivalence.

Parameter Comparison

Parameter	3KP14-B (Main)	5KP14A-B	3KP14A-TP	5KP14A-E3/54	5KP14A-E3/73	5KP14AE3/TR13	5KP14E3/TR13
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co	Vishay General Semiconductor	Vishay General Semiconductor	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Voltage - Reverse Standoff (Typ)	14V	14V	14V	14V	14V	14V	14V
Voltage - Breakdown (Min)	14.76V	15.6V	15.6V	15.6V	15.6V	15.6V	15.6V
Voltage - Clamping (Max) @ Ipp	24.36V	23.2V	23.2V	23.2V	23.2V	23.2V	25.8V
Current - Peak Pulse (10/1000µs)	129.3A	219.8A	129.3A	216A	216A	216A	194A
Power - Peak Pulse	3000W	5000W	3000W	5000W	5000W	5000W	5000W
Operating Temperature	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package / Case	P600, Axial	P600, Axial	R-6, Axial	P600, Axial	P600, Axial	P600, Axial	P600, Axial
Type	Zener	Zener	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	—	Bulk	Bulk	Cut Tape (CT)	—	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Direct P600 Package Replacements (Preferred)

The 5KP14A-B (Littelfuse Inc.) provides the most direct substitution path, maintaining identical P600 axial packaging while offering active product status. This part delivers higher peak pulse current (219.8A) and power dissipation (5000W) compared to the 3KP14-B, providing enhanced transient protection margin. Clamping voltage of 23.2V remains within acceptable tolerance for 14V-rated applications.

The 5KP14A-E3/54 and 5KP14A-E3/73 (Vishay General Semiconductor - TransZorb® series) maintain P600 packaging with 23.2V clamping voltage and 216A peak pulse current. Both parts are ROHS3 compliant and actively produced. The 5KP14A-E3/54 is supplied in Cut Tape format, while 5KP14A-E3/73 packaging is unspecified.

The 5KP14AE3/TR13 (Microchip Technology) offers P600 packaging in Tape & Reel format with 23.2V clamping voltage and 216A peak pulse current, suitable for automated assembly processes.

Alternative R-6 Package Option

The 3KP14A-TP (Micro Commercial Co) provides electrical equivalence with identical 129.3A peak pulse current and 3000W power rating, matching the original 3KP14-B specifications. However, this part uses R-6 axial packaging instead of P600, requiring PCB layout verification for mechanical compatibility.

Higher Clamping Voltage Alternative

The 5KP14E3/TR13 (Microchip Technology) features 25.8V maximum clamping voltage, representing the upper tolerance limit for 14V-rated TVS applications. This part is supplied in Tape & Reel format with 194A peak pulse current and 5000W power dissipation.

All substitute parts maintain -55°C to 175°C operating temperature range, ROHS3 compliance, and EAR99 export classification consistent with the original 3KP14-B specifications.

Frequently Asked Questions (FAQ)

Q: Can I use a 5KP series part as a direct replacement for the 3KP14-B?

A: Yes. The 5KP series parts (5KP14A-B, 5KP14A-E3/54, 5KP14A-E3/73, 5KP14AE3/TR13) are electrically equivalent for 14V transient voltage suppression applications. All maintain the same 14V reverse standoff voltage, -55°C to 175°C operating range, and P600 axial packaging. The 5KP series offers higher peak pulse current and power dissipation ratings, providing enhanced protection margin.

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

A: Both P600 and R-6 are through-hole axial package formats for TVS diodes. P600 is the standard package for the 3KP14-B. The 3KP14A-TP uses R-6 packaging, which may have different lead spacing or physical dimensions. Verify PCB footprint compatibility before selecting the R-6 alternative.

Q: Why do some substitute parts have higher peak pulse current ratings?

A: The 5KP series parts (5KP14A-B, 5KP14A-E3/54, 5KP14A-E3/73, 5KP14AE3/TR13) are rated for 5000W peak pulse power compared to the 3KP14-B's 3000W rating. This reflects improved thermal design and higher current handling capability. These parts remain compatible with 14V-rated circuits and provide additional transient suppression margin.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except 3KP14A-TP, for which RoHS status is not specified. Verify compliance requirements with your procurement or quality department if ROHS3 certification is mandatory.

Q: What is the difference between Cut Tape and Tape & Reel packaging formats?

A: Cut Tape (CT) format supplies components on continuous tape cut into specific lengths, suitable for manual or semi-automated assembly. Tape & Reel (TR) format provides components on continuous tape wound on reels, optimized for high-volume automated pick-and-place assembly. Both formats contain identical components; packaging selection depends on assembly process requirements.

Q: Can I use the 5KP14E3/TR13 with its 25.8V clamping voltage in place of the 3KP14-B?

A: The 5KP14E3/TR13 is electrically compatible for 14V transient suppression applications. Its 25.8V maximum clamping voltage represents the upper tolerance limit for this voltage class. Verify that your circuit design accommodates the higher clamping voltage before substitution.

Q: What inventory levels are available for these substitute parts?

A: Inventory quantities provided are current stock levels: 5KP14A-B (800 pcs), 3KP14A-TP (1014 pcs), 5KP14A-E3/54 (8200 pcs), 5KP14A-E3/73 (838 pcs), 5KP14AE3/TR13 (1147 pcs), 5KP14E3/TR13 (670 pcs). Verify current availability with your supplier before finalizing procurement decisions.

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