1.5KE39A-T Equivalent & Substitute Parts

Part Overview

The 1.5KE39A-T is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose transient voltage protection in through-hole applications. This part operates with a reverse standoff voltage of 33.3V and provides clamping at 53.9V with peak pulse current handling of 28A at 1500W peak pulse power. The 1.5KE39A-T is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1.5KE39A-T
Manufacturer	Diodes Incorporated
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	33.3V
Voltage - Breakdown (Min)	37.1V
Voltage - Clamping (Max) @ Ipp	53.9V
Current - Peak Pulse (10/1000µs)	28A
Power - Peak Pulse	1500W (1.5kW)
Mounting Type	Through Hole
Package / Case	DO-201AA, DO-27, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 1.5KE39A-T is determined by the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Voltage - Reverse Standoff (Typ): 33.3V
Voltage - Breakdown (Min): 37.1V
Voltage - Clamping (Max) @ Ipp: 53.9V
Current - Peak Pulse (10/1000µs): 28A (±tolerance acceptable)
Power - Peak Pulse: 1500W (1.5kW)
Type: Unidirectional Zener TVS Diode

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package / Case: DO-201 series (DO-201AA, DO-201AD, DO-201AE variants acceptable)
Operating Temperature Range: -55°C minimum to 150°C or higher maximum

Compliance Requirements:

RoHS3 Compliant
ECCN: EAR99
HTSUS: 8541.10.0080

Substitute parts are grouped into two categories: direct electrical equivalents with identical voltage and current ratings, and near-equivalent parts with minor variations in peak pulse current (±3A tolerance) that maintain functional compatibility within the 1.5KE series specification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status	RoHS Status
1.5KE39A-T	Diodes Incorporated	33.3V	37.1V	53.9V	28A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Obsolete	ROHS3 Compliant
1V5KE39A	Taiwan Semiconductor Corporation	33.3V	37.1V	53.9V	28A	1500W	DO-201AD, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
1.5KE39A	Taiwan Semiconductor Corporation	33.3V	37.1V	53.9V	29A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
1.5KE39A-B	Littelfuse Inc.	33.3V	37.1V	53.9V	28.2A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
1.5KE39A-G	Comchip Technology	33.3V	37.05V	53.9V	27.8A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 150°C	Active	ROHS3 Compliant
1.5KE39A-HF	Comchip Technology	33.3V	37.05V	53.9V	27.83A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 150°C	Active	ROHS3 Compliant
1.5KE39A-TP	Micro Commercial Co	33.3V	37.1V	53.9V	Not specified	1500W	DO-201AE, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant
1.5KE39ARL	STMicroelectronics	33.3V	37.1V	69.7V	143A (8/20µs)	1500W	DO-201AA, DO-27, Axial	-55°C ~ Not specified	Active	ROHS3 Compliant
1N5647A	Solid State Inc.	33.3V	37.1V	53.9V	28A	1500W	DO-13	-65°C ~ 175°C	Active	ROHS3 Compliant
1.5KE36A	Taiwan Semiconductor Corporation	30.8V	34.2V	49.9V	31A	1500W	DO-201AA, DO-27, Axial	-55°C ~ 175°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

1.V5KE39A (Taiwan Semiconductor Corporation) and 1.5KE39A-B (Littelfuse Inc.) are the preferred direct substitutes. Both maintain identical voltage specifications (33.3V standoff, 37.1V breakdown, 53.9V clamping) and equivalent peak pulse current ratings (28A and 28.2A respectively). Both are active products with ROHS3 compliance and full operating temperature range support (-55°C to 175°C). The 1V5KE39A is supplied in DO-201AD packaging with tape and reel availability, while 1.5KE39A-B is available in bulk packaging.

Secondary Substitutes (Near-Equivalent with Minor Current Variation):

1.5KE39A (Taiwan Semiconductor Corporation) provides identical electrical specifications with 29A peak pulse current, within acceptable tolerance of the original 28A specification. This part is actively manufactured with extensive inventory availability (42,000 pcs) and full temperature range support.

1.5KE39A-G and 1.5KE39A-HF (Comchip Technology) maintain voltage equivalence with peak pulse current of 27.8A and 27.83A respectively. These parts operate within a reduced temperature range (-55°C to 150°C), which may be acceptable depending on application requirements. Both are active products with ROHS3 compliance.

Alternative Package Consideration:

1N5647A (Solid State Inc.) provides electrical equivalence in DO-13 package instead of DO-201. This part is suitable only if PCB layout and through-hole footprint can accommodate the smaller DO-13 form factor. Operating temperature range extends to -65°C minimum.

Not Recommended for Direct Substitution:

1.5KE39ARL (STMicroelectronics) exhibits significantly different clamping voltage (69.7V versus 53.9V) and peak pulse current (143A at 8/20µs versus 28A at 10/1000µs), making it unsuitable as a direct replacement despite voltage standoff equivalence.

1.5KE36A (Taiwan Semiconductor Corporation) operates at lower voltage ratings (30.8V standoff, 34.2V breakdown, 49.9V clamping) and is not electrically equivalent to the 1.5KE39A-T.

Frequently Asked Questions (FAQ)

Q: Can I use 1.5KE39A as a direct replacement for 1.5KE39A-T?

A: Yes. The 1.5KE39A maintains identical voltage specifications (33.3V standoff, 37.1V breakdown, 53.9V clamping) with peak pulse current of 29A, which is within acceptable tolerance of the original 28A specification. Both support the full operating temperature range (-55°C to 175°C) and are ROHS3 compliant. This is an active product with high inventory availability.

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

A: All three are DO-201 series axial through-hole packages suitable for the 1.5KE39A-T application. DO-201AA and DO-201AD are standard variants with equivalent mechanical and electrical performance. DO-201AE is a variant used by specific manufacturers. Package selection depends on PCB footprint design and supplier availability. Verify footprint compatibility with your PCB layout before selection.

Q: Why is 1.5KE39ARL not recommended as a substitute?

A: The 1.5KE39ARL exhibits a clamping voltage of 69.7V compared to the required 53.9V, and peak pulse current of 143A (8/20µs) versus 28A (10/1000µs). These significant electrical differences make it unsuitable for direct substitution in circuits designed for the 1.5KE39A-T specifications.

Q: Can I use 1N5647A if my PCB supports DO-13 packaging?

A: Yes, if your PCB layout and through-hole footprint accommodate DO-13 package dimensions. The 1N5647A maintains identical voltage and current specifications (33.3V standoff, 37.1V breakdown, 53.9V clamping, 28A peak pulse current) with extended minimum operating temperature (-65°C). Verify mechanical compatibility before implementation.

Q: What should I consider when selecting between active substitute options?

A: Prioritize product status (all recommended substitutes are active), packaging availability (tape and reel versus bulk), inventory levels, and operating temperature requirements. For applications requiring the full -55°C to 175°C range, select 1V5KE39A, 1.5KE39A, or 1.5KE39A-B. For applications with -55°C to 150°C requirements, 1.5KE39A-G and 1.5KE39A-HF are acceptable. Verify ROHS3 compliance and REACH status with your procurement requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts listed in this document are ROHS3 compliant. Verify REACH status with your specific supplier, as some manufacturers report REACH Unaffected while others report REACH Affected status.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message