1.5KE33C Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 1.5KE33C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component operates with a 28.2V reverse standoff voltage and provides 1500W peak pulse power dissipation. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new designs.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	1.5KE33C	—
Manufacturer	Littelfuse Inc.	—
Category	Transient Voltage Suppressors (TVS)	—
Type	Zener	—
Bidirectional Channels	1	—
Voltage - Reverse Standoff (Typ)	28.2	V
Voltage - Breakdown (Min)	29.75	V
Voltage - Clamping (Max) @ Ipp	47.99	V
Current - Peak Pulse (10/1000µs)	33.3	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	DO-201AA, DO-27, Axial	—
RoHS Status	ROHS3 Compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the 1.5KE33C is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Voltage - Reverse Standoff (Typ): 28.2V
Voltage - Clamping (Max) @ Ipp: 45.7V to 47.99V range
Current - Peak Pulse (10/1000µs): 32.8A to 34A range
Power - Peak Pulse: 1500W
Mounting Type: Through Hole
Package / Case: DO-201AA, DO-27, or Axial configurations
Type: Zener, Bidirectional
RoHS Status: ROHS3 Compliant

All substitute parts listed maintain these core electrical specifications within acceptable engineering tolerances. Substitute parts are grouped by manufacturer and product status (Active vs. Obsolete), with preference given to active components from established semiconductor manufacturers.

Parameter Comparison

Parameter	1.5KE33C (Littelfuse)	1.5KE33CA (Diotec)	1.5KE33CA-E3/73 (Vishay)	1.5KE33CA-G (Comchip)	1.5KE33CA-HF (Comchip)	1.5KE33CA-TP (MCC)	1V5KE33CA (TSC)
Voltage - Reverse Standoff (Typ)	28.2V	28.2V	28.2V	28.2V	28.2V	28.2V	28.2V
Voltage - Breakdown (Min)	29.75V	31.4V	31.4V	31.35V	31.35V	31.4V	31.4V
Voltage - Clamping (Max) @ Ipp	47.99V	45.7V	45.7V	45.7V	45.7V	45.7V	45.7V
Current - Peak Pulse (10/1000µs)	33.3A	34A	32.8A	32.82A	32.82A	—	33A
Power - Peak Pulse	1500W	1500W	1500W	1500W	1500W	1500W	1500W
Operating Temperature Range	-55 to 175°C	-50 to 175°C	-55 to 175°C	-55 to 150°C	-55 to 150°C	-55 to 175°C	-55 to 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AA, DO-27, Axial	Axial	DO-201AA, DO-27, Axial	DO-201AA, DO-27, Axial	DO-201AA, DO-27, Axial	DO-201AE, Axial	DO-201AD, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

1.5KE33CA-E3/73 (Vishay General Semiconductor - TransZorb® Series) and 1.5KE33CAHE3_A/C / 1.5KE33CAHE3_A/D (Vishay Automotive Grade, AEC-Q101 qualified) are recommended as primary substitutes. These parts maintain identical reverse standoff voltage (28.2V), clamping voltage (45.7V), and peak pulse power (1500W) specifications. Vishay components offer full temperature range operation (-55 to 175°C) matching the original 1.5KE33C and provide established supply chain availability.

Secondary Substitutes (Electrical Equivalence with Package Variations):

1.5KE33CA (Diotec Semiconductor) and 1V5KE33CA (Taiwan Semiconductor Corporation) provide electrical equivalence with minor operating temperature differences. Diotec's 1.5KE33CA operates at -50 to 175°C (5°C reduction at lower bound), while TSC's 1V5KE33CA maintains full -55 to 175°C range. Both deliver 1500W peak pulse power and 28.2V standoff voltage. Package configurations (Axial, DO-201AD, DO-201AE) are compatible with through-hole PCB designs.

Specialized Substitutes (Specific Application Requirements):

1.5KE33CA-G and 1.5KE33CA-HF (Comchip Technology) are suitable for applications with maximum operating temperature constraints of 150°C. These components maintain electrical specifications but operate within a reduced upper temperature limit. Comchip parts are available in DO-201 packaging with Tape & Box delivery.

1.5KE33CA-TP (Micro Commercial Co) is available in Cut Tape packaging for automated assembly processes. This variant maintains full electrical specifications and -55 to 175°C operating range.

Automotive Applications:

For automotive-grade applications requiring AEC-Q101 qualification, Vishay's 1.5KE33CAHE3_A/C and 1.5KE33CAHE3_A/D are the only qualified alternatives listed, both meeting automotive reliability standards.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 1.5KE33C with any of the listed substitutes?

A: Yes, all listed substitutes maintain the critical electrical parameters (28.2V standoff, 45.7V clamping, 1500W peak pulse) and through-hole mounting compatibility. However, verify package configuration (DO-201AA, DO-27, or Axial) matches your PCB design before procurement.

Q: What is the difference between the Diotec 1.5KE33CA and Vishay 1.5KE33CA-E3/73?

A: Both maintain identical electrical specifications. The primary difference is operating temperature range: Diotec operates -50 to 175°C while Vishay operates -55 to 175°C. For applications requiring full -55°C lower temperature operation, Vishay is the appropriate choice.

Q: Are Comchip 1.5KE33CA-G and 1.5KE33CA-HF suitable for all applications?

A: These Comchip variants are suitable for applications with maximum operating temperatures of 150°C. If your design requires operation above 150°C, select alternatives with -55 to 175°C ratings (Vishay, MCC, or TSC options).

Q: What packaging options are available for the 1.5KE33CA series?

A: Substitute parts are available in multiple through-hole configurations: DO-201AA, DO-27, Axial, DO-201AD, and DO-201AE. Verify your PCB footprint compatibility before selection. Axial packages are universally compatible with standard through-hole designs.

Q: Which substitute offers the best supply chain availability?

A: Diotec Semiconductor's 1.5KE33CA shows the highest inventory (134,100 pcs), followed by Micro Commercial Co's 1.5KE33CA-TP (5,589 pcs). Vishay TransZorb® variants maintain active status with 7,100 to 1,177 pcs available depending on specific part number.

Q: Are all substitutes RoHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the original 1.5KE33C compliance status.

Q: What is the significance of the 1.5KE33CAHE3_A/C and 1.5KE33CAHE3_A/D automotive variants?

A: These Vishay parts carry AEC-Q101 automotive qualification, required for automotive applications. They maintain identical electrical specifications to standard 1.5KE33CA-E3/73 but undergo additional automotive reliability testing and qualification protocols.

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