1.5KE20A-T Equivalent & Substitute Parts

Part Overview

The 1.5KE20A-T is a unidirectional transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, rated for 1500W peak pulse power with a 27.7V maximum clamping voltage. This component is designed for general-purpose transient voltage protection in through-hole applications using the DO-201 package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	17.1V
Voltage - Breakdown (Min)	19V
Voltage - Clamping (Max) @ Ipp	27.7V
Current - Peak Pulse (10/1000µs)	54A
Power - Peak Pulse	1500W
Package / Case	DO-201AA, DO-27, Axial
Mounting Type	Through Hole
Operating Temperature	-55°C ~ 175°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: voltage ratings (reverse standoff, breakdown minimum, and clamping maximum), peak pulse current capability, peak pulse power rating, package type, and mounting configuration. All substitute parts listed maintain identical or equivalent electrical specifications within the allowed tolerance ranges for TVS diodes in this category.

Substitutes are grouped into two categories based on package compatibility:

Category A - DO-201 Package (Direct Pin-Compatible): Parts maintaining the original DO-201, DO-201AA, or DO-201AD package configuration with peak pulse current ratings between 54A and 56A and 1500W power rating.

Category B - Alternative Packages (Electrical Equivalent, Different Form Factor): Parts with identical electrical specifications but different package types (DO-13, DO-41), suitable only when mechanical constraints permit package substitution.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Package	Product Status
1.5KE20A-T	Diodes Incorporated	17.1V	27.7V	54A	1500W	DO-201	Obsolete
1.5CE120A TR PBFREE	Central Semiconductor Corp	17.1V	27.7V	54A	1500W	DO-201	Active
1.5KE20A	Taiwan Semiconductor Corporation	17.1V	27.7V	56A	1500W	DO-201	Active
1.5KE20A-B	Littelfuse Inc.	17.1V	27.7V	54.9A	1500W	DO-201	Active
1.5KE20A-G	Comchip Technology	17.1V	27.7V	54.15A	1500W	DO-201	Active
1.5KE20A-HF	Comchip Technology	17.1V	27.7V	54.15A	1500W	DO-201	Active
1.5KE20A-TP	Micro Commercial Co	17.1V	27.7V	Not Specified	1500W	DO-201AE	Active
1N5640A	Solid State Inc.	17.1V	27.7V	54A	1500W	DO-13	Active
1V5KE20A	Fairchild Semiconductor	17.1V	27.7V	54.2A	1500W	DO-201AD	Active
P4KE20A-AP	Micro Commercial Co	17.1V	27.7V	14.8A	400W	DO-41	Active
P4KE20A-BP	Micro Commercial Co	17.1V	27.7V	14.8A	400W	DO-41	Active

Engineering Selection Recommendations

Primary Substitutes (DO-201 Package, Full Power Rating):

1.5KE20A (Taiwan Semiconductor Corporation), 1.5KE20A-B (Littelfuse Inc.), 1.5KE20A-G (Comchip Technology), and 1.5KE20A-HF (Comchip Technology) are direct substitutes with active product status and ROHS3 compliance. These parts maintain identical voltage specifications and 1500W power ratings with peak pulse currents within 54A to 56A range. 1.5CE120A TR PBFREE (Central Semiconductor Corp) provides equivalent electrical performance with active status and ROHS3 compliance.

Secondary Substitutes (DO-201 Variants):

1.5KE20A-TP (Micro Commercial Co) offers electrical equivalence in the DO-201AE package variant. 1V5KE20A (Fairchild Semiconductor) provides full electrical equivalence in the DO-201AD package with 54.2A peak pulse current.

Alternative Package Substitutes (Reduced Power Rating):

1N5640A (Solid State Inc.) maintains full electrical specifications and 1500W power rating in the DO-13 package, suitable only when mechanical board layout permits smaller package substitution. P4KE20A-AP and P4KE20A-BP (Micro Commercial Co) provide voltage equivalence in the DO-41 package but with reduced peak pulse current (14.8A) and power rating (400W), making them unsuitable for applications requiring full 1500W transient protection.

All recommended substitutes carry ROHS3 compliance and are manufactured by established semiconductor suppliers with active product status.

Frequently Asked Questions (FAQ)

Q: Can I substitute 1.5KE20A-T with any of the listed alternatives?

A: Direct substitution is possible only with parts maintaining identical package type (DO-201 or compatible variants), voltage ratings (17.1V standoff, 27.7V clamping), and power rating (1500W). Parts with reduced power ratings (P4KE20A series at 400W) are not suitable for equivalent protection.

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

A: These are axial through-hole package variants with identical electrical performance and pin spacing. DO-201, DO-201AA, DO-201AD, and DO-201AE are mechanically compatible for PCB mounting purposes. Verify specific package dimensions with component datasheets if board layout constraints exist.

Q: Why are P4KE20A-AP and P4KE20A-BP listed if they have lower power ratings?

A: These parts are listed as electrical voltage equivalents only. Their 400W power rating and 14.8A peak pulse current make them unsuitable for applications requiring the full 1500W transient protection of the original 1.5KE20A-T. Use only if application requirements permit reduced transient energy absorption.

Q: Is 1N5640A a suitable substitute despite the DO-13 package?

A: 1N5640A maintains full electrical specifications and 1500W power rating. Package substitution is possible only if PCB layout and mechanical constraints permit the smaller DO-13 form factor. Verify lead spacing and mounting hole compatibility before implementation.

Q: Are all listed substitutes ROHS3 compliant?

A: All primary and secondary substitutes carry ROHS3 compliance. Verify specific compliance documentation with individual manufacturers for regulatory requirements in your application region.

Q: What is the operating temperature range difference between substitutes?

A: Most substitutes operate across -55°C to 175°C (TJ). 1.5KE20A-G and 1.5KE20A-HF operate to -55°C to 150°C (TJ), and 1N5640A operates to -65°C to 175°C (TJ). Select based on application thermal requirements.

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