Littelfuse 5KP36 Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The Littelfuse 5KP36 is a unidirectional transient voltage suppressor diode designed for general-purpose overvoltage protection applications. Featuring a 36V reverse standoff voltage, 61.01V maximum clamping voltage, and 5000W peak pulse power rating, this component operates through a P600 axial package with through-hole mounting. The device is currently classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	36	V
Voltage - Breakdown (Min)	37.89	V
Voltage - Clamping (Max) @ Ipp	61.01	V
Power - Peak Pulse	5000	W
Type	Zener	—
Unidirectional Channels	1	—
Mounting Type	Through Hole	—
Operating Temperature Range	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 5KP36 is determined by the following critical parameters:

Primary Substitution Criteria:

Reverse standoff voltage within the 36V nominal range
Unidirectional channel configuration (single channel)
Zener diode type
Through-hole axial mounting
Operating temperature range compatibility (-55°C to 175°C minimum)
ROHS3 compliance

Secondary Considerations:

Peak pulse power rating (5000W preferred for direct replacement; lower ratings acceptable for reduced transient energy applications)
Clamping voltage at peak pulse current (61.01V reference)
Package form factor (P600 preferred; DO-201 and DO-15 acceptable with mechanical adaptation)

Substitute parts are grouped into two categories: direct package replacements (P600 axial) and alternative package options (DO-201 and DO-15 axial) that maintain electrical equivalence while offering different form factors and power ratings.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Min (V)	Clamp Voltage Max (V)	Peak Pulse Power (W)	Package	Status
5KP36	Littelfuse Inc.	36	37.89	61.01	5000	P600	Obsolete
5KP36A	Diotec Semiconductor	36	40	58.1	5000	P600	Active
5KP36A-TP	Micro Commercial Co	36	40	58.1	5000	R-6	Active
SLD36U-017-B	Littelfuse Inc.	36	40	58.1	5000	P600	Active
1.5KE36A	Taiwan Semiconductor Corporation	30.8	34.2	49.9	1500	DO-201	Active
1.5KE39A	Taiwan Semiconductor Corporation	33.3	37.1	53.9	1500	DO-201	Active
1.5KE43A	Taiwan Semiconductor Corporation	36.8	40.9	59.3	1500	DO-201	Active
P6KE36A	Fairchild Semiconductor	30.8	34.2	49.9	600	DO-15	Active
P6KE43A	Diotec Semiconductor	36.8	40.9	59.3	600	DO-15	Active
SA33A	Fairchild Semiconductor	33	36.7	53.3	500	DO-15	Obsolete

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended):

5KP36A (Diotec Semiconductor) and SLD36U-017-B (Littelfuse Inc.) are the primary substitutes. Both maintain the P600 axial package, 36V standoff voltage, 5000W peak pulse power rating, and ROHS3 compliance. SLD36U-017-B carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability. 5KP36A offers equivalent electrical performance with active product status and established supply availability.

Tier 2 - Alternative Packaging (Same Power Rating):

5KP36A-TP (Micro Commercial Co) provides identical electrical specifications in R-6 axial packaging with cut-tape delivery format. This option is suitable when tape-and-reel automation is required or when R-6 package compatibility exists in the design.

Tier 3 - Reduced Power Rating (Lower Transient Energy):

1.5KE series devices (1.5KE36A, 1.5KE39A, 1.5KE43A from Taiwan Semiconductor Corporation) deliver 1500W peak pulse power in DO-201 axial packages. These are applicable when transient energy levels are lower than the original 5000W specification. 1.5KE43A provides the closest voltage matching to the original 5KP36 clamping characteristics.

Tier 4 - Minimal Power Rating (Low-Energy Applications):

P6KE series devices (P6KE36A, P6KE43A) and SA33A offer 600W and 500W peak pulse power respectively in DO-15 axial packages. These are suitable only for applications with minimal transient energy requirements and are not recommended as primary replacements for the 5KP36.

Compliance Status:

All recommended substitutes maintain ROHS3 compliance. SLD36U-017-B is the only option with automotive-grade qualification (AEC-Q101). SA33A is obsolete and should be avoided for new designs.

Frequently Asked Questions (FAQ)

Q: Can 5KP36A directly replace 5KP36 without circuit modification?

A: Yes. 5KP36A maintains identical standoff voltage (36V), peak pulse power (5000W), and P600 axial package configuration. Electrical performance is equivalent within specified tolerances.

Q: What is the difference between 5KP36A and SLD36U-017-B?

A: Both are electrically equivalent 36V, 5000W TVS diodes in P600 packages. SLD36U-017-B carries AEC-Q101 automotive qualification and is manufactured by Littelfuse. Selection depends on automotive-grade requirements and supply chain preferences.

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

A: No. The 1.5KE36A is rated for 1500W peak pulse power versus 5000W for the 5KP36. Use only in applications where transient energy is confirmed to be below 1500W. The DO-201 package also differs mechanically from P600.

Q: What is the impact of using P6KE36A instead of 5KP36?

A: P6KE36A is rated for only 600W peak pulse power and uses a DO-15 package. This substitution is only valid for low-energy transient protection and requires mechanical board layout adaptation. Not recommended as a general replacement.

Q: Are there voltage tolerance differences between substitute parts?

A: Yes. The 5KP36 specifies 37.89V minimum breakdown voltage. Substitutes vary: 5KP36A and SLD36U-017-B specify 40V; 1.5KE36A specifies 34.2V; 1.5KE43A specifies 40.9V. Verify breakdown voltage compatibility with your circuit design requirements.

Q: Can I use 1.5KE39A or 1.5KE43A if 1.5KE36A is unavailable?

A: 1.5KE39A and 1.5KE43A have higher standoff voltages (33.3V and 36.8V respectively) and are suitable only if your circuit tolerates these voltage shifts. Both maintain 1500W power rating and DO-201 packaging.

Q: Is SA33A a viable substitute?

A: No. SA33A is obsolete and rated for only 500W peak pulse power. It should not be selected for new designs or production applications.

Q: What packaging considerations apply when switching from P600 to DO-201 or DO-15?

A: P600, DO-201, and DO-15 are all axial through-hole packages but have different physical dimensions and lead spacing. Board layout and mechanical clearance must be verified before substitution. DO-201 and DO-15 packages are smaller and may require PCB redesign.

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