1.5KE24A-T Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 1.5KE24A-T is a unidirectional Zener transient voltage suppressor diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in through-hole applications. This component features a 20.5V reverse standoff voltage with 33.2V maximum clamping voltage and 45A peak pulse current capability in a DO-201 package. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	20.5	V
Voltage - Breakdown (Min)	22.8	V
Voltage - Clamping (Max) @ Ipp	33.2	V
Current - Peak Pulse (10/1000µs)	45	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 1.5KE24A-T is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 20.5V
Voltage - Clamping (Max) @ Ipp: 33.2V
Voltage - Breakdown (Min): 22.8V
Current - Peak Pulse (10/1000µs): minimum 45A
Power - Peak Pulse: 1500W
Type: Zener, Unidirectional
Mounting Type: Through Hole
Package compatibility: DO-201 series or equivalent axial through-hole packages

Substitute Categories:

Category 1: Direct Electrical Equivalents (DO-201 Package) Parts maintaining identical voltage specifications, 1500W power rating, and DO-201 package form factor. Peak pulse current may vary within acceptable tolerance (45A to 47A). These substitutes are functionally interchangeable without circuit modification.

Category 2: Alternate Package Equivalents (DO-13 Package) Parts with identical electrical specifications but different through-hole package geometry (DO-13). Mechanical board layout modification required; electrical performance remains equivalent.

Category 3: Higher Power Alternatives (P600 Package) Parts with similar voltage characteristics but significantly higher power ratings (5000W) and peak pulse current (155A-171A) in larger P600 packages. These provide enhanced transient protection capability and are suitable for applications requiring increased thermal margin.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
1.5KE24A-T	Diodes Incorporated	20.5V	33.2V	45A	1500W	DO-201AA	-55 to 175°C (TJ)	Obsolete
1.5KE24A	Taiwan Semiconductor Corporation	20.5V	33.2V	47A	1500W	DO-201AA	-55 to 175°C (TJ)	Active
1.5KE24A-B	Littelfuse	20.5V	33.2V	45.8A	1500W	DO-201AA	-55 to 175°C (TJ)	Active
1.5KE24A-G	Comchip Technology	20.5V	33.2V	45.18A	1500W	DO-201AA	-55 to 150°C (TJ)	Active
1.5KE24A-HF	Comchip Technology	20.5V	33.2V	45.18A	1500W	DO-201AA	-55 to 150°C (TJ)	Active
1.5KE24A-TP	Micro Commercial Co	20.5V	33.2V	Not Specified	1500W	DO-201AE	-55 to 175°C (TJ)	Active
1N5642A	Solid State Inc.	20.5V	33.2V	45A	1500W	DO-13	-65 to 175°C (TA)	Active
1V5KE24A	Fairchild Semiconductor	20.5V	33.2V	45.2A	1500W	DO-201AD	-55 to 175°C (TJ)	Active
5KP17E3/TR13	Microchip Technology	17V	30.5V	164A	5000W	P600	-55 to 175°C (TJ)	Active
5KP18AE3/TR13	Microchip Technology	18V	29.2V	171A	5000W	P600	-55 to 175°C (TJ)	Active
5KP18E3/TR13	Microchip Technology	18V	32.2V	155A	5000W	P600	-55 to 175°C (TJ)	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement (DO-201 Package):

The 1.5KE24A from Taiwan Semiconductor Corporation is the preferred direct substitute. This part maintains identical voltage specifications (20.5V standoff, 33.2V clamping), equivalent power rating (1500W), and compatible DO-201 package geometry. Peak pulse current of 47A exceeds the original 45A specification, providing improved transient handling margin. Product status is active with full RoHS3 compliance and unlimited moisture sensitivity rating. This substitution requires no circuit or board layout modifications.

Secondary Recommendations - DO-201 Package Alternatives:

1.5KE24A-B (Littelfuse) and 1.5KE24A-TP (Micro Commercial Co) provide equivalent electrical performance with active product status and RoHS3 compliance. Both maintain the 1500W power rating and 20.5V/33.2V voltage specifications. 1.5KE24A-B offers peak pulse current of 45.8A; 1.5KE24A-TP maintains full temperature range (-55 to 175°C) matching the original part. 1V5KE24A (Fairchild Semiconductor) similarly qualifies as a direct electrical equivalent with 45.2A peak pulse current and full temperature range support.

Temperature-Constrained Alternatives:

1.5KE24A-G and 1.5KE24A-HF (both Comchip Technology) provide identical electrical specifications but with reduced maximum junction temperature of 150°C versus the original 175°C. These substitutes are suitable only for applications where the upper temperature limit does not exceed 150°C.

Alternate Package Option - DO-13:

1N5642A (Solid State Inc.) maintains all electrical specifications with identical 45A peak pulse current and 1500W power rating. The DO-13 package requires mechanical board layout modification but provides equivalent electrical performance. Extended temperature range (-65 to 175°C) offers improved low-temperature operation.

Higher Power Alternative - P600 Package:

The 5KP series devices (Microchip Technology) provide significantly enhanced transient protection with 5000W power rating and peak pulse currents of 155A-171A. These parts operate at lower voltage standoff levels (17-18V) and require circuit evaluation for voltage compatibility. P600 package geometry necessitates board redesign. Selection of 5KP18E3/TR13 (32.2V clamping) provides closest voltage alignment to the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use 1.5KE24A-G or 1.5KE24A-HF as direct replacements for 1.5KE24A-T?

A: These parts are electrically equivalent but operate at a maximum junction temperature of 150°C compared to the original 175°C. They are suitable substitutes only if your application does not require operation above 150°C. If your circuit operates within this temperature constraint, these active parts are fully compatible.

Q: What is the difference between the 1.5KE24A and 1.5KE24A-TP?

A: Both parts maintain identical voltage specifications (20.5V standoff, 33.2V clamping) and 1500W power rating. The primary difference is package designation: 1.5KE24A uses DO-201AA while 1.5KE24A-TP uses DO-201AE. Both are through-hole axial packages with compatible board footprints. The 1.5KE24A-TP does not specify peak pulse current in the provided data.

Q: Why would I consider the 5KP series instead of the 1.5KE24A series?

A: The 5KP series provides higher power dissipation capability (5000W versus 1500W) and significantly higher peak pulse current (155A-171A versus 45A). These devices are suitable for applications requiring enhanced transient protection or where thermal margin is critical. However, they operate at lower voltage standoff levels (17-18V) and require larger P600 packages, necessitating circuit and board layout evaluation.

Q: Is 1N5642A compatible with my existing board layout?

A: 1N5642A maintains identical electrical specifications but uses a DO-13 package instead of DO-201. The DO-13 package has different physical dimensions and pin spacing. Board layout modification is required for mechanical compatibility, though electrical performance is equivalent.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts listed are RoHS3 compliant. The original 1.5KE24A-T is also RoHS3 compliant. Moisture sensitivity level is rated as 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Q: What is the difference between 5KP17E3/TR13 and 5KP18E3/TR13?

A: These parts differ in voltage rating and clamping characteristics. 5KP17E3/TR13 operates at 17V standoff with 30.5V clamping, while 5KP18E3/TR13 operates at 18V standoff with 32.2V clamping. The 5KP18E3/TR13 provides closer voltage alignment to the original 1.5KE24A-T specification (20.5V standoff, 33.2V clamping) but still represents a lower voltage device suitable only for applications where this voltage reduction is acceptable.

Q: Can I use the 1.5KE24A from Taiwan Semiconductor Corporation as a drop-in replacement?

A: Yes. The 1.5KE24A from Taiwan Semiconductor Corporation is a direct drop-in replacement. It maintains identical voltage specifications, equivalent power rating, compatible DO-201 package, and active product status with full RoHS3 compliance. Peak pulse current of 47A exceeds the original specification, providing improved performance margin.

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