1.5KE39 Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The 1.5KE39 is a unidirectional Zener-type transient voltage suppressor manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This component operates with a 33.3V reverse standoff voltage and delivers 1500W peak pulse power dissipation. The 1.5KE39 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing circuit protection requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33.3	V
Voltage - Breakdown (Min)	35.15	V
Voltage - Clamping (Max) @ Ipp	56.6	V
Current - Peak Pulse (10/1000µs)	28.2	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	-
Type	Zener	-
Unidirectional Channels	1	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the 1.5KE39 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

Voltage - Reverse Standoff (Typ): 33.3V
Voltage - Clamping (Max) @ Ipp: 53.9V to 56.6V range
Power - Peak Pulse: 1500W (1.5kW)
Current - Peak Pulse (10/1000µs): 27.8A to 29A range
Mounting Type: Through Hole
Package / Case: DO-201AA, DO-27, or Axial configurations
Type: Zener, Unidirectional (1 channel)
Operating Temperature: -55°C to 150°C minimum (175°C preferred)
RoHS Status: ROHS3 Compliant

All identified substitute parts maintain these core electrical specifications within acceptable engineering tolerances. Substitute parts are grouped by manufacturer and product status (Active vs. Obsolete). Parts with automotive-grade qualification (AEC-Q101) are identified separately for applications requiring automotive compliance.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Automotive Grade
1.5KE39	Littelfuse Inc.	Obsolete	33.3	56.6	28.2	1500	-55 to 175	DO-201AA, DO-27, Axial	No
1.5KE39A	Taiwan Semiconductor Corporation	Active	33.3	53.9	29	1500	-55 to 175	DO-201AA, DO-27, Axial	No
1.5KE39A-E3/73	Vishay General Semiconductor - Diodes Division	Active	33.3	53.9	27.8	1500	-55 to 175	DO-201AA, DO-27, Axial	No
1.5KE39A-G	Comchip Technology	Active	33.3	53.9	27.8	1500	-55 to 150	DO-201AA, DO-27, Axial	No
1.5KE39A-HF	Comchip Technology	Active	33.3	53.9	27.83	1500	-55 to 150	DO-201AA, DO-27, Axial	No
1.5KE39A-TP	Micro Commercial Co	Active	33.3	53.9	Not specified	1500	-55 to 175	DO-201AE, Axial	No
1.5KE39AHE3_A/C	Vishay General Semiconductor - Diodes Division	Active	33.3	53.9	27.8	1500	-55 to 175	DO-201AA, DO-27, Axial	Yes (AEC-Q101)
1.5KE39AHE3_A/D	Vishay General Semiconductor - Diodes Division	Active	33.3	53.9	27.8	1500	-55 to 175	DO-201AA, DO-27, Axial	Yes (AEC-Q101)
1N6285A-E3/54	Vishay General Semiconductor - Diodes Division	Active	33.3	53.9	27.8	1500	-55 to 175	DO-201AA, DO-27, Axial	No
1N6285A-E3/73	Vishay General Semiconductor - Diodes Division	Active	33.3	53.9	27.8	1500	-55 to 175	DO-201AA, DO-27, Axial	No

Engineering Selection Recommendations

For Standard Applications (Non-Automotive): The 1.5KE39A from Taiwan Semiconductor Corporation is the primary active equivalent, offering full electrical compatibility with the obsolete 1.5KE39 and extended temperature operation to 175°C. Vishay TransZorb® series parts (1.5KE39A-E3/73, 1N6285A-E3/73, 1N6285A-E3/54) provide equivalent performance with established reliability in industrial applications and are ROHS3 compliant.

For Automotive Applications (AEC-Q101 Required): The 1.5KE39AHE3_A/C and 1.5KE39AHE3_A/D from Vishay General Semiconductor - Diodes Division are automotive-grade alternatives with AEC-Q101 qualification, maintaining full electrical specifications and extended temperature range (-55°C to 175°C). These parts are suitable for automotive circuit protection where qualification standards are mandatory.

For Cut Tape Packaging: The 1.5KE39A-TP from Micro Commercial Co provides active supply in cut tape format with full temperature range support (-55°C to 175°C), suitable for automated assembly processes.

Temperature Consideration: Parts from Comchip Technology (1.5KE39A-G, 1.5KE39A-HF) operate to 150°C maximum junction temperature, which is 25°C lower than the original specification. These are suitable only for applications where maximum operating temperature does not exceed 150°C.

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can I use 1.5KE39A-G or 1.5KE39A-HF as direct replacements for the 1.5KE39?

A: These parts are electrically compatible for most applications. However, they are rated to 150°C maximum junction temperature versus the original 175°C specification. Use these substitutes only if your circuit design does not require operation above 150°C.

Q: What is the difference between 1.5KE39A-E3/73 and 1N6285A-E3/73?

A: Both parts are manufactured by Vishay and share identical electrical specifications (33.3V standoff, 53.9V clamping, 27.8A peak pulse, 1500W power). The difference is the base part number designation. Both are active, ROHS3 compliant, and suitable for direct substitution.

Q: Are automotive-grade parts (1.5KE39AHE3_A/C, 1.5KE39AHE3_A/D) required for all applications?

A: Automotive-grade parts with AEC-Q101 qualification are required only for automotive circuit protection applications or where automotive compliance standards are specified. For general industrial and consumer applications, standard-grade equivalents are sufficient.

Q: What is the difference between cut tape (1.5KE39A-TP) and other packaging formats?

A: Cut tape packaging is optimized for automated pick-and-place assembly. Electrical performance is identical to other formats. Select cut tape only if your manufacturing process requires this packaging type.

Q: Can I substitute the 1.5KE39 with parts having different clamping voltages?

A: No. The clamping voltage (53.9V to 56.6V range) is a critical parameter for overvoltage protection. Substitutes must maintain clamping voltage within the specified range to ensure proper circuit protection. Parts outside this range will not provide equivalent protection.

Q: Is the 1.5KE39A-TP suitable for high-temperature applications?

A: Yes. The 1.5KE39A-TP supports the full temperature range (-55°C to 175°C), making it suitable for high-temperature applications. However, peak pulse current is not specified in the datasheet; verify this parameter with the manufacturer if peak current rating is critical to your design.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitutes are ROHS3 compliant, ensuring environmental and regulatory compatibility.

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