ICT-18C Equivalent & Substitute Parts Reference

Part Overview

The ICT-18C is a Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, classified as a unidirectional Zener-type device in DO-13 through-hole packaging. This component is designed for general-purpose transient voltage suppression applications with a 18V reverse standoff voltage and 25.5V maximum clamping voltage at peak pulse current. The part is currently in active production status with 1010 units available in inventory.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining functional compatibility in the target application circuit.

Substiute Parts

ICT-18C

Microchip TechnologyIn Stock: 1075ICT-18C Datasheet

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1.5KE18CA

Taiwan Semiconductor CorporationIn Stock: 123661.5KE18CA Datasheet

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1.5KE18CA

Taiwan Semiconductor CorporationIn Stock: 123661.5KE18CA Datasheet

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1.5KE20CA

Taiwan Semiconductor CorporationIn Stock: 151731.5KE20CA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ICT-18C are identified based on the following critical electrical parameters:

• Voltage - Clamping (Max) @ Ipp: 25.5V (primary matching criterion)
• Power - Peak Pulse: 1500W (1.5kW) (required performance level)
• Bidirectional Channels: 1 (functional topology)
• Type: Zener (device classification)
• Mounting Type: Through Hole (mechanical compatibility)

The substitute parts 1.5KE18CA and 1.5KE20CA are classified as equivalent alternatives because they maintain the same maximum clamping voltage (25.5V and 27.7V respectively), identical peak pulse power rating (1500W), and compatible through-hole mounting configuration. These devices operate within the same functional category and application space as the ICT-18C.

The 1.5KE18CA exhibits a lower reverse standoff voltage (15.3V) compared to the ICT-18C (18V), while the 1.5KE20CA exhibits a higher reverse standoff voltage (17.1V). Both substitute parts deliver peak pulse currents (60A and 56A respectively) that exceed the ICT-18C specification (50A), providing enhanced transient suppression capability.

Parameter Comparison

Engineering Selection Recommendations

ICT-18C (Primary Component)

The ICT-18C remains the specified component when the DO-13 package form factor is a mandatory design requirement and RoHS non-compliance is acceptable for the application. This part maintains the narrowest reverse standoff voltage specification at 18V, providing precise voltage regulation in circuits requiring this exact threshold.

1.5KE18CA (Substitute - Voltage-Matched Alternative)

The 1.5KE18CA is suitable as a substitute when the application permits package transition from DO-13 to DO-201 (axial lead) configuration and RoHS3 compliance is required. This part delivers identical clamping voltage performance (25.5V) with enhanced peak pulse current capacity (60A versus 50A). The lower reverse standoff voltage (15.3V) represents a 15% reduction from the ICT-18C specification and must be evaluated against circuit protection requirements.

1.5KE20CA (Substitute - Higher Voltage Alternative)

The 1.5KE20CA is suitable as a substitute when the application permits package transition from DO-13 to DO-201 (axial lead) configuration, RoHS3 compliance is required, and the circuit can accommodate a higher clamping voltage (27.7V). This part provides the highest peak pulse current capacity (56A) among the three options. The reverse standoff voltage (17.1V) is 5% lower than the ICT-18C specification.

Both substitute parts are ROHS3 compliant, whereas the ICT-18C is RoHS non-compliant. Both substitute parts operate across a reduced low-temperature range (-55°C minimum versus -65°C minimum for the ICT-18C).

Frequently Asked Questions (FAQ)

Q: Can the 1.5KE18CA directly replace the ICT-18C in a PCB layout designed for DO-13 packaging?

A: No. The 1.5KE18CA uses DO-201 (axial lead) packaging, which has different lead spacing and mounting hole requirements compared to the DO-13 radial configuration. PCB layout modification is required.

Q: What is the primary electrical difference between the 1.5KE18CA and 1.5KE20CA?

A: The 1.5KE20CA has a higher reverse standoff voltage (17.1V versus 15.3V) and higher clamping voltage (27.7V versus 25.5V). Both maintain identical 1500W peak pulse power ratings. Selection depends on the specific voltage protection threshold required by the circuit.

Q: Are the substitute parts functionally equivalent to the ICT-18C for all applications?

A: Functional equivalence is limited to applications where the DO-201 package form factor is acceptable and the voltage specifications of the substitute part align with circuit protection requirements. The lower reverse standoff voltages of both substitutes (15.3V and 17.1V) differ from the ICT-18C (18V) and must be evaluated against the specific transient voltage profile of the target application.

Q: Why do the substitute parts have higher peak pulse current ratings than the ICT-18C?

A: The 1.5KE18CA and 1.5KE20CA are rated for 60A and 56A peak pulse current respectively, compared to 50A for the ICT-18C. This represents enhanced transient suppression capability within the same 1500W power envelope and does not create incompatibility; circuits designed for 50A operation remain protected.

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

A: The ICT-18C operates from -65°C to 175°C, while both substitute parts operate from -55°C to 175°C. The substitute parts have a 10°C higher minimum operating temperature. Applications requiring operation below -55°C must retain the ICT-18C.

Q: Are there compliance differences between the ICT-18C and substitute parts?

A: Yes. The ICT-18C is RoHS non-compliant, while both 1.5KE18CA and 1.5KE20CA are ROHS3 compliant. Applications subject to RoHS3 regulatory requirements must use the substitute parts.