1.5KE33A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 1.5KE33A is a unidirectional transient voltage suppressor diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in through-hole applications. This component features a 28.2V reverse standoff voltage, 45.7V maximum clamping voltage, and 1500W peak pulse power rating in a DO-201 axial package. The original part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28.2	V
Voltage - Breakdown (Min)	31.4	V
Voltage - Clamping (Max) @ Ipp	45.7	V
Current - Peak Pulse (10/1000µs)	33	A
Power - Peak Pulse	1500	W
Type	Zener	-
Unidirectional Channels	1	-
Mounting Type	Through Hole	-
Package / Case	DO-201AA, DO-27, Axial	-
Operating Temperature Range	-55 to 175	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the 1.5KE33A is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 28.2V
Voltage - Clamping (Max) @ Ipp: 45.7V
Current - Peak Pulse (10/1000µs): 33A ±5%
Power - Peak Pulse: 1500W
Type: Zener, Unidirectional
Mounting Type: Through Hole
Package Compatibility: DO-201 series (DO-201AA, DO-201AD, DO-201AE)

Substitute parts are grouped into two categories:

Category 1 - Direct Electrical Equivalents (Identical Parameters): Parts with matching voltage ratings, clamping characteristics, and peak pulse current within acceptable tolerance. These include 1.5CE33A TR PBFREE (Central Semiconductor), 1V5KE33A (Fairchild Semiconductor), 1.5KE33A variants from Good-Ark Semiconductor, Littelfuse Inc., Micro Commercial Co, and Comchip Technology.

Category 2 - Related Voltage Series (Different Voltage Rating): The 1.5KE27A from Taiwan Semiconductor Corporation operates at a lower voltage class (23.1V standoff, 37.5V clamping) and is included as a manufacturer-recommended alternative for applications requiring lower voltage protection thresholds.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status	Operating Temp (°C)
1.5KE33A-T	Diodes Incorporated	28.2	45.7	33	1500	DO-201	Obsolete	-55 to 175
1.5CE33A TR PBFREE	Central Semiconductor Corp	28.2	45.7	33	1500	DO-201	Active	-65 to 175
1V5KE33A	Fairchild Semiconductor	28.2	45.7	33	1500	DO-201AD	Active	-55 to 175
1.5KE33A	Good-Ark Semiconductor	28.2	45.7	32.8	1500	DO-201AE	Active	-55 to 175
1.5KE33A-AP	Micro Commercial Co	28.2	45.7	33.3	1500	DO-201AE	Active	-55 to 175
1.5KE33A-B	Littelfuse Inc.	28.2	45.7	33.3	1500	DO-201	Active	-55 to 175
1.5KE33A-G	Comchip Technology	28.2	45.7	32.82	1500	DO-201	Active	-55 to 150
1.5KE33A-HF	Comchip Technology	28.2	45.7	32.82	1500	DO-201	Active	-55 to 150
1.5KE33A-TP	Micro Commercial Co	28.2	45.7	-	1500	DO-201AE	Active	-55 to 175
1.5KE27A	Taiwan Semiconductor Corporation	23.1	37.5	42	1500	DO-201	Active	-55 to 175

Engineering Selection Recommendations

Primary Substitutes (Identical Electrical Specifications):

For direct replacement of the obsolete 1.5KE33A-T, select from active-status alternatives with matching 28.2V standoff and 45.7V clamping voltages. The 1.5KE33A from Good-Ark Semiconductor and 1.5KE33A-B from Littelfuse Inc. are recommended due to high inventory availability (34,829 and 1,498 units respectively) and ROHS3 compliance. The 1.5CE33A TR PBFREE from Central Semiconductor offers extended lower temperature operation (-65°C minimum) for applications requiring enhanced cold-temperature performance.

Package Compatibility Considerations:

All primary substitutes maintain through-hole axial mounting and DO-201 series packaging. Variants include DO-201AA, DO-201AD, and DO-201AE designations, which are mechanically and electrically interchangeable in standard through-hole PCB layouts. Verify specific package variant compatibility with PCB footprint requirements.

Temperature Range Selection:

Most active substitutes operate across -55°C to 175°C. The Comchip Technology variants (1.5KE33A-G and 1.5KE33A-HF) limit upper operation to 150°C; select these only if application maximum temperature does not exceed 150°C. The 1.5CE33A TR PBFREE extends lower temperature operation to -65°C for cryogenic or extreme cold-weather applications.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and MSL 1 (unlimited moisture sensitivity). REACH status varies; Good-Ark Semiconductor, Littelfuse Inc., Micro Commercial Co, and Comchip Technology variants are REACH Unaffected, while Central Semiconductor's 1.5CE33A TR PBFREE is REACH Unaffected.

Alternative Voltage Class:

The 1.5KE27A from Taiwan Semiconductor Corporation operates at 23.1V standoff and 37.5V clamping, suitable only for applications requiring lower voltage protection thresholds. This part is not a direct substitute but a related alternative for different circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the 1.5KE33A-T?

A: Yes, all parts listed in the primary substitutes category (1.5KE33A variants from Good-Ark, Littelfuse, Micro Commercial, and Comchip; 1.5CE33A TR PBFREE from Central Semiconductor; and 1V5KE33A from Fairchild) are electrically and mechanically equivalent. They share identical voltage ratings (28.2V standoff, 45.7V clamping), peak pulse current (33A ±5%), and 1500W power rating. Verify package variant compatibility with your PCB footprint.

Q: What is the difference between DO-201AA, DO-201AD, and DO-201AE packages?

A: These are mechanical variants of the DO-201 axial through-hole package. All three are compatible with standard DO-201 PCB footprints. The suffix designations (AA, AD, AE) indicate minor manufacturing or lead configuration variations from different manufacturers but do not affect electrical performance or interchangeability in circuit applications.

Q: Why is the 1.5KE27A listed as a substitute if it has different voltage ratings?

A: The 1.5KE27A is a manufacturer-recommended alternative, not a direct substitute. It operates at lower voltage thresholds (23.1V standoff, 37.5V clamping) and is suitable only for applications requiring protection at lower voltage levels. Use this part only if your circuit design specifically requires 27V-class protection rather than 33V-class protection.

Q: Which substitute offers the best temperature performance?

A: The 1.5CE33A TR PBFREE from Central Semiconductor extends operation to -65°C minimum, compared to -55°C for most other substitutes. Select this variant for applications requiring enhanced cold-temperature performance. For standard applications, -55°C to 175°C operation is sufficient.

Q: Are all these parts RoHS compliant?

A: Yes, all listed substitutes are ROHS3 compliant. Moisture sensitivity level is MSL 1 (unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Q: What is the inventory status of these substitutes?

A: Good-Ark Semiconductor's 1.5KE33A offers the highest availability at 34,829 units. Fairchild Semiconductor's 1V5KE33A provides 12,349 units. Taiwan Semiconductor's 1.5KE27A has 30,100 units available. Other variants range from 717 to 2,520 units. Verify current inventory with your supplier before design finalization.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message