15KPA33 Equivalent & Substitute Parts

Part Overview

The 15KPA33 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 33V reverse standoff voltage with a 57.44V maximum clamping voltage and 276.1A peak pulse current capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	15KPA33
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	33V
Voltage - Breakdown (Min)	34.79V
Voltage - Clamping (Max) @ Ipp	57.44V
Current - Peak Pulse (10/1000µs)	276.1A
Power - Peak Pulse	15000W (15kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 15KPA33 is determined by the following critical parameters:

Voltage - Reverse Standoff: 33V (all substitutes must match this specification)
Voltage - Clamping (Max) @ Ipp: Range 53.3V to 57.44V (acceptable variation within TVS diode performance tolerances)
Current - Peak Pulse (10/1000µs): 9.4A to 276.1A (dependent on package and power rating)
Power - Peak Pulse: 5000W to 15000W (determines application suitability)
Mounting Type: Through Hole (all substitutes maintain axial through-hole configuration)
Package / Case: P600 or DO-15 (both are standard axial packages for this voltage class)
RoHS Status: ROHS3 Compliant (all substitutes meet this requirement)

Substitute parts are grouped into two categories based on power dissipation capability: 15kW-rated devices (15KPA series and equivalent) and 5kW-rated devices (5KP series). Selection depends on application peak pulse current requirements.

Parameter Comparison

Parameter	15KPA33 (Main)	15KPA33A	SA33A	15KPA33AE3/TR13	5KP33A-TP	5KP33AHE3/54	5KP33AHE3/73
Manufacturer	Littelfuse Inc.	MDE Semiconductor Inc	Fairchild Semiconductor	Microchip Technology	Micro Commercial Co	Vishay General Semiconductor	Vishay General Semiconductor
Product Status	Obsolete	Active	Obsolete	Active	Active	Active	Active
Voltage - Reverse Standoff (Typ)	33V	33V	33V	33V	33V	33V	33V
Voltage - Breakdown (Min)	34.79V	36.9V	36.7V	36.9V	36.7V	36.7V	36.7V
Voltage - Clamping (Max) @ Ipp	57.44V	54.7V	53.3V	54.7V	53.3V	53.3V	53.3V
Current - Peak Pulse (10/1000µs)	276.1A	276.1A	9.4A	276.1A	—	93.8A	93.8A
Power - Peak Pulse	15000W (15kW)	15000W (15kW)	500W	15000W (15kW)	5000W (5kW)	5000W (5kW)	5000W (5kW)
Operating Temperature	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TJ)	—	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TJ)	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	P600, Axial	P600, Axial	DO-204AC, DO-15, Axial	P600, Axial	R-6, Axial	P600, Axial	P600, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Qualification	—	—	—	—	—	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

Direct Equivalents (15kW Power Rating):

15KPA33A (MDE Semiconductor Inc) and 15KPA33AE3/TR13 (Microchip Technology) are direct functional equivalents with active product status. Both maintain the 15kW peak pulse power rating, 276.1A peak pulse current, and P600 package configuration. 15KPA33AE3/TR13 is supplied in Tape & Reel packaging, suitable for automated assembly processes.

Alternative Substitutes (5kW Power Rating):

5KP33AHE3/54 and 5KP33AHE3/73 (Vishay General Semiconductor) are active alternatives with reduced power dissipation (5kW) and lower peak pulse current (93.8A). Both carry AEC-Q101 automotive qualification. These parts are suitable for applications where peak pulse current does not exceed 93.8A. 5KP33A-TP (Micro Commercial Co) is a 5kW-rated alternative in R-6 package with active status.

Not Recommended:

SA33A (Fairchild Semiconductor) is obsolete with significantly reduced peak pulse current (9.4A) and power rating (500W), making it unsuitable for high-energy transient suppression applications equivalent to the 15KPA33.

Frequently Asked Questions (FAQ)

Q: Can I use a 5kW-rated TVS diode as a substitute for the 15kW-rated 15KPA33?

A: Only if your application peak pulse current does not exceed the 5kW device rating. The 5KP33AHE3/54 and 5KP33AHE3/73 are rated for 93.8A peak pulse current. If your circuit requires the full 276.1A capability of the 15KPA33, use 15KPA33A or 15KPA33AE3/TR13.

Q: What is the difference between P600 and DO-15 packages?

A: Both are axial through-hole packages for TVS diodes. P600 is a larger package with higher current handling capability. DO-15 (DO-204AC) is a smaller package suitable for lower current applications. SA33A uses DO-15 packaging and is limited to 9.4A peak pulse current.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts meet ROHS3 compliance requirements.

Q: Which substitute part has automotive qualification?

A: 5KP33AHE3/54 and 5KP33AHE3/73 both carry AEC-Q101 automotive qualification. These are suitable for automotive transient suppression applications.

Q: What is the difference between 15KPA33A and 15KPA33AE3/TR13?

A: Both are functionally equivalent with identical electrical specifications. The primary difference is packaging: 15KPA33A is supplied in Bulk packaging, while 15KPA33AE3/TR13 is supplied in Tape & Reel (TR) format, which is standard for automated assembly processes.

Q: Can I substitute based on voltage rating alone?

A: No. While all substitutes share the 33V reverse standoff voltage, peak pulse current and power dissipation ratings must match your application requirements. Verify that the substitute part's current and power ratings meet or exceed your circuit's transient suppression demands.

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