ICTE-15 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The ICTE-15 is a unidirectional Zener transient voltage suppressor diode manufactured by Littelfuse Inc., rated for 15V reverse standoff with a 20.6V maximum clamping voltage. This component is designed for general-purpose transient voltage suppression applications in through-hole DO-201AD axial package configuration. The ICTE-15 is classified as obsolete product status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	ICTE-15
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	15V
Voltage - Breakdown (Min)	17.6V
Voltage - Clamping (Max) @ Ipp	20.6V
Power - Peak Pulse	1500W (1.5kW)
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-201AD, Axial
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the ICTE-15 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Unidirectional channel configuration (1 channel required)
Voltage - Reverse Standoff within acceptable tolerance of 15V nominal
Voltage - Breakdown (Min) in the range of 17.1V to 19V
Voltage - Clamping (Max) @ Ipp between 20.6V and 27.7V
Power - Peak Pulse rating of 500W minimum to 1500W
Through-hole axial mounting type

Mechanical Compatibility Criteria:

Through-hole axial package configuration (DO-201AD, DO-201AA, DO-27, DO-204AC, or DO-15)
Operating temperature range minimum of -55°C

The substitute parts listed below meet these criteria and are classified as active products with current manufacturer support and improved compliance certifications.

Parameter Comparison

Parameter	ICTE-15	1.5KE18A	1.5KE20A	P6KE20A	SA15A-B	P5KE17A-TP
Manufacturer	Littelfuse Inc.	Taiwan Semiconductor	Taiwan Semiconductor	Fairchild Semiconductor	Littelfuse Inc.	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	15V	15.3V	17.1V	17.1V	15V	17V
Voltage - Breakdown (Min)	17.6V	17.1V	19V	19V	16.7V	18.9V
Voltage - Clamping (Max) @ Ipp	20.6V	25.5V	27.7V	27.7V	24.4V	27.6V
Current - Peak Pulse (10/1000µs)	Not specified	60A	56A	22A	20.9A	16.1A
Power - Peak Pulse	1500W	1500W	1500W	600W	500W	500W
Operating Temperature	-55°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 175°C	-50°C ~ 175°C	-55°C ~ 175°C	-65°C ~ 175°C
Package / Case	DO-201AD	DO-201AA, DO-27	DO-201AA, DO-27	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AC, DO-15
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The 1.5KE18A and 1.5KE20A from Taiwan Semiconductor Corporation are the preferred substitutes. Both parts maintain the 1500W peak pulse power rating of the original ICTE-15, offer ROHS3 compliance, and are classified as active products with extended operating temperature ranges to 175°C. The 1.5KE18A provides the closest voltage standoff match at 15.3V, while the 1.5KE20A offers slightly elevated voltage ratings suitable for applications requiring additional margin. Both are available in DO-201AA and DO-27 axial packages compatible with through-hole PCB layouts.

Secondary Substitutes (Reduced Power Rating):

The SA15A-B from Littelfuse Inc. maintains the original 15V reverse standoff voltage and ROHS3 compliance but operates at 500W peak pulse power. This substitute is suitable for applications with lower transient energy requirements. The P6KE20A from Fairchild Semiconductor and P5KE17A-TP from Micro Commercial Co are available in DO-204AC (DO-15) axial packages with 600W and 500W peak pulse ratings respectively, accommodating space-constrained designs while maintaining adequate voltage suppression characteristics.

Compliance Considerations:

The ICTE-15 is RoHS non-compliant. All recommended active substitutes (1.5KE18A, 1.5KE20A, SA15A-B) are ROHS3 compliant, supporting modern procurement and environmental compliance requirements. The P6KE20A and P5KE17A-TP do not specify RoHS status in available documentation.

Frequently Asked Questions (FAQ)

Q: Can the 1.5KE20A directly replace the ICTE-15 in existing designs?

A: The 1.5KE20A is electrically compatible as a substitute. It maintains the 1500W peak pulse power rating and unidirectional Zener configuration. The primary consideration is package compatibility: the ICTE-15 uses DO-201AD while the 1.5KE20A uses DO-201AA or DO-27. These packages are mechanically similar axial through-hole configurations and are typically interchangeable on standard PCB layouts. Verify PCB footprint spacing before implementation.

Q: What is the difference between the 1.5KE18A and 1.5KE20A substitutes?

A: Both parts share identical 1500W peak pulse power ratings and ROHS3 compliance. The 1.5KE18A has a 15.3V reverse standoff voltage with 25.5V maximum clamping, while the 1.5KE20A has a 17.1V reverse standoff with 27.7V maximum clamping. The 1.5KE18A provides closer voltage matching to the original ICTE-15 (15V standoff), while the 1.5KE20A offers higher voltage suppression margins suitable for applications with elevated transient stress.

Q: Why do some substitutes have lower power ratings (500W or 600W)?

A: The SA15A-B, P6KE20A, and P5KE17A-TP are available in smaller DO-204AC (DO-15) axial packages, which have reduced thermal dissipation capability compared to the larger DO-201 series packages. These lower-power substitutes are suitable for applications where transient energy levels are below 500W or where PCB space constraints require compact component footprints.

Q: Are there package compatibility issues between DO-201AD and DO-201AA?

A: Both DO-201AD and DO-201AA are axial through-hole packages with similar lead spacing and mechanical dimensions. They are generally interchangeable on standard PCB layouts. However, verify specific PCB footprint requirements and lead diameter specifications (typically 0.032 inches) to confirm compatibility with existing board designs.

Q: What is the significance of the extended operating temperature range in substitute parts?

A: The ICTE-15 operates from -55°C to 150°C, while most active substitutes extend to 175°C. This extended range provides additional thermal margin in high-temperature applications and reflects modern component design standards. For applications operating within the original -55°C to 150°C range, this extended capability does not affect performance but provides design flexibility for future thermal requirements.

Q: Can the SA15A-B substitute be used in high-energy transient applications?

A: The SA15A-B is rated for 500W peak pulse power, compared to the ICTE-15's 1500W rating. It is suitable for general-purpose transient suppression applications with lower energy transients. For applications requiring the full 1500W suppression capability, the 1.5KE18A or 1.5KE20A are recommended.

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