Equivalent & Substitute Parts for 3KP36-B TVS Diode

Part Overview

The 3KP36-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 36V reverse standoff voltage with a 61.01V maximum clamping voltage and 51.6A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs requiring similar protection characteristics.

Key Parameters

Parameter	3KP36-B
Voltage - Reverse Standoff (Typ)	36V
Voltage - Breakdown (Min)	37.89V
Voltage - Clamping (Max) @ Ipp	61.01V
Current - Peak Pulse (10/1000µs)	51.6A
Power - Peak Pulse	3000W
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 3KP36-B is determined by the following critical parameters:

Voltage Rating: Reverse standoff voltage of 36V and breakdown voltage minimum of 37.89V to 40.2V
Package Type: Through-hole axial configuration (P600 or R-6 equivalent packages)
Clamping Voltage: Maximum clamping voltage range of 58.1V to 61.01V at peak pulse current
Peak Pulse Power: Minimum 3000W capability, with higher ratings acceptable
Operating Temperature: -55°C to 175°C junction temperature range
Compliance: ROHS3 compliance and general-purpose application classification

Substitute parts are grouped into two categories: direct equivalents with identical or superior electrical performance in the same package footprint, and higher-power alternatives that maintain voltage compatibility while offering increased transient energy absorption capability.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package / Case	Product Status
3KP36-B	Littelfuse Inc.	36V	61.01V	51.6A	3000W	P600, Axial	Obsolete
5KP36A-B	Littelfuse Inc.	36V	58.1V	87.8A	5000W	P600, Axial	Active
5KP36A-E3/54	Vishay General Semiconductor	36V	58.1V	86.1A	5000W	P600, Axial	Active
5KP36A-E3/73	Vishay General Semiconductor	36V	58.1V	86.1A	5000W	P600, Axial	Active
5KP36AHE3/54	Vishay General Semiconductor	36V	58.1V	86.1A	5000W	P600, Axial	Active
5KP36AHE3/73	Vishay General Semiconductor	36V	58.1V	86.1A	5000W	P600, Axial	Active
5KP36A-TP	Micro Commercial Co	36V	58.1V	Not Specified	5000W	R-6, Axial	Active
15KP36A-TP	Micro Commercial Co	36V	59.7V	Not Specified	15000W	R-6, Axial	Active
15KPA36AE3/TR13	Microchip Technology	36V	59.8V	252.5A	15000W	P600, Axial	Active

Engineering Selection Recommendations

Direct Substitutes (Same Power Rating Class)

The 5KP36A series from Littelfuse, Vishay, and Micro Commercial Co represent direct substitutes for the 3KP36-B. These parts maintain the 36V voltage rating and P600/R-6 axial package compatibility while offering improved or equivalent clamping performance. The 5KP36A-B from Littelfuse provides the closest functional match with active product status and identical package specification. Vishay's 5KP36A-E3/54, 5KP36A-E3/73, 5KP36AHE3/54, and 5KP36AHE3/73 variants are qualified alternatives with ROHS3 compliance. The automotive-grade variants (5KP36AHE3/54 and 5KP36AHE3/73) include AEC-Q101 qualification for applications requiring automotive-level reliability.

Higher-Power Alternatives

The 15KP36A-TP and 15KPA36AE3/TR13 provide five-fold power dissipation capability (15000W versus 3000W) while maintaining voltage compatibility. These components are suitable for applications requiring enhanced transient energy absorption or where design margin improvement is necessary. The 15KPA36AE3/TR13 offers the highest peak pulse current specification at 252.5A in the P600 package.

Package Considerations

Parts specified with P600 package maintain direct mechanical and electrical compatibility with the original 3KP36-B footprint. Parts with R-6 package designation (5KP36A-TP and 15KP36A-TP) are mechanically compatible through-hole axial components but may require PCB layout verification for lead spacing.

Compliance and Availability

All substitute parts listed are ROHS3 compliant with active product status, ensuring long-term availability and regulatory compliance. Inventory levels range from 718 to 8200 pieces across the substitute options.

Frequently Asked Questions (FAQ)

Q: Can I use a 5KP36A series part as a direct replacement for the 3KP36-B?

A: Yes. The 5KP36A series maintains the 36V reverse standoff voltage and through-hole axial package configuration. The clamping voltage (58.1V) is within acceptable tolerance of the original specification (61.01V), and the higher peak pulse current and power rating provide equivalent or superior protection performance.

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

A: Both are through-hole axial packages for TVS diodes. P600 is the standard Littelfuse/Vishay designation, while R-6 is the Micro Commercial Co equivalent. They are mechanically compatible but may have different lead spacing. Verify PCB layout compatibility before substitution.

Q: Why would I choose a 15KP36A part over a 5KP36A part?

A: The 15KP36A series provides five times the peak pulse power dissipation (15000W versus 5000W). Select this option when the application experiences higher transient energy levels or when design margin improvement is required. The voltage rating remains identical at 36V.

Q: Are the automotive-grade variants (5KP36AHE3) suitable for non-automotive applications?

A: Yes. Automotive-grade parts with AEC-Q101 qualification exceed the reliability requirements of general-purpose applications. They can be used in any application requiring the 36V TVS protection function.

Q: What does the suffix designation (E3/54, E3/73, HE3) indicate?

A: These suffixes represent manufacturing date codes and internal Vishay designations. They do not affect electrical performance or substitution compatibility. Parts with different suffixes are functionally equivalent.

Q: Is the 3KP36-B still available for purchase?

A: The 3KP36-B is classified as obsolete. Use one of the active substitute parts listed for new designs or system maintenance. Current inventory of substitute parts ranges from 718 to 8200 units across multiple manufacturers.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message