1.5KE39CA Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 1.5KE39CA is a unidirectional Zener-type transient voltage suppressor diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection applications. This component features a 33.3V reverse standoff voltage with a 53.9V maximum clamping voltage and 28A peak pulse current capability in a through-hole DO-201 package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33.3	V
Voltage - Breakdown (Min)	37.1	V
Voltage - Clamping (Max) @ Ipp	53.9	V
Current - Peak Pulse (10/1000µs)	28	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	-
Package / Case	DO-201AA, DO-27, Axial	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 1.5KE39CA is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 33.3V
Voltage - Clamping (Max) @ Ipp: 53.9V
Voltage - Breakdown (Min): 37.1V (±0.05V tolerance acceptable)
Current - Peak Pulse (10/1000µs): 28A minimum
Power - Peak Pulse: 1500W (1.5kW)
Mounting Type: Through Hole
Package / Case: DO-201 series (DO-201AA, DO-201AD, DO-201AE variants)
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (DO-201 Package Family): Parts maintaining identical voltage specifications, peak pulse current ≥28A, 1500W power rating, and DO-201 package variants. These parts are pin-compatible and functionally interchangeable.

Category B - Reduced Current Capability (Alternative Packages): Parts with identical voltage specifications but reduced peak pulse current and power ratings, available in alternative through-hole packages (DO-41, DO-15). These are suitable only for applications with lower transient current requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package / Case	Operating Temp (°C)	RoHS Status
1.5KE39CA	Diodes Incorporated	Obsolete	33.3	53.9	28	1500	DO-201AA, DO-27	-55 to 175	ROHS3 Compliant
1V5KE39CA	Taiwan Semiconductor Corporation	Active	33.3	53.9	28	1500	DO-201AD	-55 to 175	ROHS3 Compliant
1.5KE39CA	Taiwan Semiconductor Corporation	Active	33.3	53.9	29	1500	DO-201AA, DO-27	-55 to 150	ROHS3 Compliant
1.5KE39CA-B	Littelfuse Inc.	Active	33.3	53.9	28.2	1500	DO-201AA, DO-27	-55 to 175	ROHS3 Compliant
1.5KE39CA-G	Comchip Technology	Active	33.3	53.9	27.83	1500	DO-201AA, DO-27	-55 to 150	ROHS3 Compliant
1.5KE39CA-TP	Micro Commercial Co	Active	33.3	53.9	Not Specified	1500	DO-201AE	-55 to 175	ROHS3 Compliant
P4KE39CA-HF	Comchip Technology	Active	33.3	53.9	7.42	400	DO-204AL, DO-41	-55 to 150	ROHS3 Compliant
TP6KE39CA	Littelfuse	Active	33.3	53.9	11.3	600	DO-204AC, DO-15	-55 to 175	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

1.5KE39CA-B (Littelfuse Inc.) and 1.5KE39CA (Taiwan Semiconductor Corporation) are the preferred direct substitutes. Both maintain full electrical equivalence with peak pulse current ≥28A and 1500W power dissipation. The Littelfuse variant extends the operating temperature range to 175°C, matching the original Diodes Incorporated specification. Both are active products with established supply chains and ROHS3 compliance.

Secondary Substitutes (DO-201 Package Variants):

1V5KE39CA (Taiwan Semiconductor Corporation) and 1.5KE39CA-TP (Micro Commercial Co) provide electrical equivalence within the DO-201 package family. The 1V5KE39CA is available in DO-201AD packaging with confirmed 28A peak pulse current. The 1.5KE39CA-TP variant uses DO-201AE packaging; however, peak pulse current is not specified and must be confirmed with the manufacturer before selection.

Alternative Package Options (Reduced Current Capability):

P4KE39CA-HF (Comchip Technology) and TP6KE39CA (Littelfuse) maintain voltage specifications but operate at reduced peak pulse current (7.42A and 11.3A respectively) and lower power dissipation (400W and 600W). These are suitable only for applications where transient current requirements do not exceed their rated specifications. P4KE39CA-HF uses DO-41 packaging; TP6KE39CA uses DO-15 packaging. Both require circuit board layout modifications due to different package footprints.

Frequently Asked Questions (FAQ)

Q: Can I use 1.5KE39CA-B as a direct replacement for the obsolete 1.5KE39CA?

A: Yes. The 1.5KE39CA-B from Littelfuse maintains identical voltage specifications (33.3V standoff, 53.9V clamping), peak pulse current of 28.2A, and 1500W power rating. It is available in the same DO-201 package family and is ROHS3 compliant. The extended operating temperature range (-55°C to 175°C) matches the original specification.

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

A: All three are axial through-hole packages within the DO-201 family with identical electrical performance and pin spacing. DO-201AA, DO-201AD, and DO-201AE represent manufacturer-specific package designations. Physical dimensions and lead configurations are compatible for standard PCB footprints designed for DO-201 components. Verify specific package dimensions with the selected manufacturer if custom footprints are used.

Q: Can I substitute P4KE39CA-HF or TP6KE39CA for the 1.5KE39CA?

A: These parts maintain the same voltage specifications but have significantly reduced peak pulse current and power dissipation. P4KE39CA-HF is rated for 7.42A and 400W; TP6KE39CA is rated for 11.3A and 600W, compared to the original 28A and 1500W. Substitution is only valid if your application's transient current requirements are within these reduced ratings. Additionally, these parts use different packages (DO-41 and DO-15 respectively), requiring PCB layout modifications.

Q: Why is the peak pulse current specification missing for 1.5KE39CA-TP?

A: The 1.5KE39CA-TP datasheet provided does not include peak pulse current specification. Before selecting this part, contact Micro Commercial Co to confirm the peak pulse current rating. If the rating is ≥28A, it qualifies as a direct equivalent; if lower, it may not be suitable for applications requiring the full 28A transient current capability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, meeting the same environmental and regulatory requirements as the original 1.5KE39CA.

Q: What is the impact of operating temperature range differences?

A: The original 1.5KE39CA and 1.5KE39CA-B support -55°C to 175°C operation. Some substitutes (1.5KE39CA from Taiwan Semiconductor, 1.5KE39CA-G, and P4KE39CA-HF) are limited to -55°C to 150°C. If your application requires operation above 150°C, select parts with the extended 175°C rating.

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