ICT-18 Equivalent & Substitute Parts

Part Overview

The ICT-18 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, rated for 18V reverse standoff voltage with a 25.2V maximum clamping voltage. This component is designed for general-purpose transient voltage protection in through-hole applications using the DO-13 package. The ICT-18 is currently in active product status with 766 units in stock.

Equivalent and substitute parts are identified when alternative TVS diodes share compatible electrical characteristics within the specified parameter ranges, allowing direct or near-direct replacement in circuit designs while maintaining protection performance and thermal management requirements.

Substiute Parts

ICT-18

Microchip TechnologyIn Stock: 873ICT-18 Datasheet

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1.5KE18A

Taiwan Semiconductor CorporationIn Stock: 33821.5KE18A Datasheet

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1.5KE18A

Taiwan Semiconductor CorporationIn Stock: 33821.5KE18A Datasheet

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1.5KE20A

Taiwan Semiconductor CorporationIn Stock: 304131.5KE20A Datasheet

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LCE15A

Littelfuse Inc.In Stock: 2372LCE15A Datasheet

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LCE18A

Littelfuse Inc.In Stock: 1007LCE18A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ICT-18 are identified based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

• Zener diode type with unidirectional channel configuration
• Reverse standoff voltage within acceptable operating range (15V to 18V nominal)
• Clamping voltage performance between 24.4V and 29.2V at peak pulse current
• Peak pulse current rating of 50A or greater
• Peak pulse power rating of 1500W (1.5kW)
• Through-hole mounting configuration
• General-purpose transient voltage protection application

Package Compatibility: The ICT-18 uses DO-13 package. Substitute parts identified in this reference use DO-201 (DO-201AA, DO-27, Axial) packages. These represent different physical form factors and require PCB layout modification for direct substitution.

Voltage Operating Range: Substitutes maintain reverse standoff voltages between 15V and 18V, with clamping voltages ranging from 24.4V to 29.2V. This range ensures protection of circuits designed for the 18V nominal rating while accommodating manufacturing tolerances across different manufacturers.

Current and Power Ratings: All identified substitutes maintain 1500W peak pulse power dissipation with peak pulse currents between 50A and 61A, ensuring equivalent or superior transient suppression capability.

Parameter Comparison

Engineering Selection Recommendations

1.5KE18A (Taiwan Semiconductor Corporation)

The 1.5KE18A is electrically compatible with the ICT-18 for general-purpose transient voltage suppression. Both devices share identical 1500W peak pulse power ratings and comparable clamping voltage performance (25.5V vs. 25.2V). The 1.5KE18A provides 60A peak pulse current, exceeding the ICT-18's 50A rating. The substitute operates across a narrower temperature range (-55°C to 175°C versus -65°C to 175°C). The 1.5KE18A is ROHS3 compliant, whereas the ICT-18 is RoHS non-compliant. Package form factor differs: DO-201 versus DO-13, requiring PCB layout modification. High inventory availability (3300 units) supports production requirements.

1.5KE20A (Taiwan Semiconductor Corporation)

The 1.5KE20A operates at a higher reverse standoff voltage (17.1V) and clamping voltage (27.7V) compared to the ICT-18. This device is suitable for circuits requiring higher transient voltage margins. Peak pulse current rating of 56A exceeds the ICT-18's 50A specification. Power dissipation remains equivalent at 1500W. Operating temperature range is -55°C to 175°C. ROHS3 compliance is achieved. DO-201 package requires PCB modification. Inventory availability is substantial (30,400 units).

LCE15A (Littelfuse Inc.)

The LCE15A operates at a lower reverse standoff voltage (15V) and clamping voltage (24.4V) compared to the ICT-18. This device is suitable for circuits with lower voltage thresholds. Peak pulse current rating of 61A exceeds the ICT-18's 50A specification. Power dissipation is equivalent at 1500W. Operating temperature range is -55°C to 175°C. ROHS3 compliance is achieved. DO-201 package requires PCB modification. Inventory availability is 2343 units.

LCE18A (Littelfuse Inc.)

The LCE18A matches the ICT-18's reverse standoff voltage (18V) exactly. Clamping voltage is higher at 29.2V, providing increased transient suppression margin. Peak pulse current rating of 51A is comparable to the ICT-18's 50A specification. Power dissipation is equivalent at 1500W. Operating temperature range is -55°C to 175°C. ROHS3 compliance is achieved. DO-201 package requires PCB modification. Inventory availability is 953 units.

Frequently Asked Questions (FAQ)

Q: Can I directly replace an ICT-18 with a 1.5KE18A without circuit modification?

A: Electrical substitution is possible due to matching power ratings, comparable clamping voltages, and equivalent unidirectional zener diode configuration. However, package form factor differs (DO-13 versus DO-201), requiring PCB layout modification for physical installation.

Q: What is the primary difference between the LCE18A and 1.5KE18A substitutes?

A: Both devices share the same 18V reverse standoff voltage and 1500W power rating. The LCE18A has a higher clamping voltage (29.2V) and lower peak pulse current (51A) compared to the 1.5KE18A (25.5V clamping, 60A peak pulse). Manufacturer differs: Littelfuse versus Taiwan Semiconductor Corporation.

Q: Why does the ICT-18 have a wider operating temperature range than the substitute parts?

A: The ICT-18 operates from -65°C to 175°C, while all identified substitutes operate from -55°C to 175°C. The lower temperature limit difference reflects different manufacturing specifications. For applications requiring operation below -55°C, the ICT-18 is the appropriate selection.

Q: Are all substitute parts RoHS compliant?

A: The ICT-18 is RoHS non-compliant. All identified substitute parts (1.5KE18A, 1.5KE20A, LCE15A, LCE18A) are ROHS3 compliant. This distinction is relevant for applications subject to RoHS regulatory requirements.

Q: What does the DO-13 versus DO-201 package difference mean for my design?

A: DO-13 and DO-201 are different through-hole package form factors with different physical dimensions and lead spacing. Substitution requires PCB redesign to accommodate the new package footprint. Both are through-hole mounting types suitable for wave soldering and manual assembly.

Q: Can I use the 1.5KE20A in a circuit designed for 18V protection?

A: The 1.5KE20A has a higher reverse standoff voltage (17.1V) and clamping voltage (27.7V) compared to the ICT-18 (18V and 25.2V respectively). This device provides higher voltage margins and is suitable for circuits where increased transient suppression headroom is acceptable or beneficial.

Q: Which substitute offers the closest electrical match to the ICT-18?

A: The LCE18A provides the closest electrical match, sharing the identical 18V reverse standoff voltage. Clamping voltage is slightly higher at 29.2V versus 25.2V. Peak pulse current is comparable at 51A versus 50A. Both devices are rated for 1500W peak pulse power.

Q: What inventory considerations should I evaluate when selecting a substitute?

A: Current inventory levels are: ICT-18 (766 units), 1.5KE18A (3300 units), 1.5KE20A (30,400 units), LCE15A (2343 units), LCE18A (953 units). Availability varies significantly across manufacturers and part numbers, which may influence procurement decisions for high-volume production requirements.