5KP36-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP36-B is a unidirectional transient voltage suppressor diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This component features a 36V reverse standoff voltage rating with a 61.01V maximum clamping voltage and 5000W peak pulse power handling capability in a through-hole P600 axial package.

The 5KP36-B is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Manufacturer Part Number	5KP36-B
Manufacturer	Littelfuse
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	36V
Voltage - Breakdown (Min)	37.89V
Voltage - Clamping (Max) @ Ipp	61.01V
Power - Peak Pulse	5000W (5kW)
Mounting Type	Through Hole
Package / Case	P600, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 5KP36-B is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 36V nominal
Voltage - Clamping (Max) @ Ipp: Maximum 61.01V
Power - Peak Pulse: 5000W (5kW) minimum
Unidirectional Channels: 1
Mounting Type: Through Hole
Package / Case: P600, Axial preferred; alternative packages acceptable with design verification

Substitution Categories:

Category 1: Direct Package Equivalents (P600 Axial) Parts maintaining identical P600 axial package with 5000W power rating and 36V standoff voltage. These provide pin-for-pin compatibility without circuit board modifications.

Category 2: Alternative Package Substitutes (DO-201 Axial) Parts with DO-201 package offering reduced power ratings (1500W) but maintaining compatible voltage parameters. Suitable for applications where peak pulse power requirements are lower than 5000W.

Category 3: Reduced Power Alternatives (DO-15 Axial) Parts with DO-15 package and 600W power rating. These are applicable only when circuit design permits lower power dissipation or when transient energy levels are significantly reduced.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
5KP36-B	Littelfuse	36V	37.89V	61.01V	-	5000W	P600, Axial	-55°C ~ 175°C	Obsolete
5KP36A	Diotec Semiconductor	36V	40V	58.1V	86A	5000W	P600, Axial	-50°C ~ 175°C	Active
5KP36A-B	Littelfuse Inc.	36V	40V	58.1V	87.8A	5000W	P600, Axial	-55°C ~ 175°C	Active
SLD36U-017-B	Littelfuse Inc.	36V	40V	58.1V	87.8A	5000W	P600, Axial	-55°C ~ 175°C	Active
1.5KE36A	Taiwan Semiconductor Corporation	30.8V	34.2V	49.9V	31A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Active
1.5KE39A	Taiwan Semiconductor Corporation	33.3V	37.1V	53.9V	29A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Active
1.5KE43A	Taiwan Semiconductor Corporation	36.8V	40.9V	59.3V	26A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Active
P6KE36A	Fairchild Semiconductor	30.8V	34.2V	49.9V	12.6A	600W	DO-204AC, DO-15, Axial	-50°C ~ 175°C	Active
P6KE43A	Diotec Semiconductor	36.8V	40.9V	59.3V	10.6A	600W	DO-204AC, DO-15, Axial	-50°C ~ 175°C	Active
SA33A	Fairchild Semiconductor	33V	36.7V	53.3V	9.4A	500W	DO-204AC, DO-15, Axial	-	Obsolete

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement (P600 Package):

For applications requiring full compatibility with the original 5KP36-B specification, select either 5KP36A-B (Littelfuse) or SLD36U-017-B (Littelfuse). Both parts maintain identical P600 axial packaging, 5000W peak pulse power rating, and 36V standoff voltage. The 5KP36A-B and SLD36U-017-B are active products with ROHS3 compliance and extended temperature range (-55°C to 175°C), ensuring long-term availability and regulatory compliance.

Secondary Recommendation - Alternative Package (DO-201):

When circuit design permits reduced peak pulse power handling, the 1.5KE series (1.5KE36A, 1.5KE39A, or 1.5KE43A) from Taiwan Semiconductor Corporation provides active product status with 1500W power rating. The 1.5KE43A offers the closest voltage clamping match (59.3V) to the original specification. These parts require board layout modification due to DO-201 package geometry but maintain through-hole mounting compatibility.

Tertiary Recommendation - Reduced Power Alternative (DO-15 Package):

The P6KE series (P6KE36A or P6KE43A) offers 600W power rating in DO-15 package. These are suitable only for applications where transient energy levels are significantly lower than the original design specification. The P6KE43A provides voltage parameters closer to the original part.

Compliance Considerations:

All recommended active substitutes maintain ROHS3 compliance. The 5KP36A-B and SLD36U-017-B from Littelfuse provide the highest assurance of long-term availability and regulatory support. Avoid SA33A due to obsolete product status.

Frequently Asked Questions (FAQ)

Q: Can 5KP36A-B directly replace 5KP36-B without circuit modifications?

A: Yes. The 5KP36A-B maintains identical P600 axial package, 36V standoff voltage, and 5000W peak pulse power rating. No circuit board modifications are required for direct substitution.

Q: What is the difference between 5KP36A and 5KP36A-B?

A: The primary difference is packaging format. 5KP36A is supplied in Tape & Reel (TR) format by Diotec Semiconductor, while 5KP36A-B is supplied in Bulk format by Littelfuse. Both maintain identical electrical specifications and P600 package geometry. Selection depends on procurement volume and supplier preference.

Q: Can 1.5KE36A replace 5KP36-B in high-energy transient applications?

A: No. The 1.5KE36A is rated for 1500W peak pulse power, compared to 5000W for the 5KP36-B. Use 1.5KE36A only when circuit analysis confirms transient energy levels are below 1500W. Additionally, the DO-201 package requires board layout modification.

Q: Why is the voltage clamping specification different between 5KP36-B and 5KP36A-B?

A: The 5KP36-B specifies 61.01V maximum clamping voltage, while 5KP36A-B specifies 58.1V. Both values fall within acceptable operating ranges for 36V standoff voltage devices. The 5KP36A-B represents a tighter specification and is acceptable for the original application.

Q: Is SLD36U-017-B suitable for automotive applications?

A: Yes. The SLD36U-017-B carries AEC-Q101 automotive qualification and is designated for automotive-grade applications. This part is preferred when automotive compliance is required.

Q: What is the minimum operating temperature difference between substitute options?

A: The 5KP36A from Diotec Semiconductor and P6KE series parts operate from -50°C minimum, compared to -55°C for Littelfuse parts. For applications requiring -55°C operation, select Littelfuse 5KP36A-B or SLD36U-017-B.

Q: Can P6KE36A be used in place of 5KP36-B?

A: P6KE36A is suitable only for applications where peak pulse power requirements are 600W or lower. The DO-15 package also requires board layout modification. Verify circuit transient energy specifications before selection.

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