ICT-22 Equivalent & Substitute Parts

Part Overview

The ICT-22 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, rated for 22V reverse standoff voltage with a 32V maximum clamping voltage. This through-hole component in DO-13 packaging is designed for general-purpose transient voltage suppression applications and is currently in active production status.

Substitute parts become necessary when the DO-13 package form factor is not required, when alternative compliance certifications are needed, or when different voltage and current ratings better match specific circuit protection requirements while maintaining equivalent 1500W peak pulse power dissipation capability.

Substiute Parts

ICT-22

Microchip TechnologyIn Stock: 1183ICT-22 Datasheet

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1.5KE22A

Taiwan Semiconductor CorporationIn Stock: 183631.5KE22A Datasheet

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1.5KE24A

Taiwan Semiconductor CorporationIn Stock: 148381.5KE24A Datasheet

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1.5KE27A

Taiwan Semiconductor CorporationIn Stock: 301961.5KE27A Datasheet

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LCE20A

Littelfuse Inc.In Stock: 1615LCE20A Datasheet

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LCE22A

Littelfuse Inc.In Stock: 1040LCE22A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ICT-22 are qualified based on the following criteria:

Electrical Equivalence Parameters:

• Unidirectional Zener TVS diode topology (1 channel)
• Peak pulse power rating of 1500W
• Reverse standoff voltage within the 18.8V to 23.1V range
• Clamping voltage (maximum @ Ipp) between 30.6V and 37.5V
• Peak pulse current (10/1000µs) between 40A and 51A
• General-purpose transient voltage suppression applications

Mechanical & Packaging Compatibility:

• Through-hole mounting configuration
• DO-201 (DO-27, Axial) package form factor as alternative to DO-13
• Moisture Sensitivity Level 1 (Unlimited)

Compliance & Status:

• Active product status
• RoHS3 compliance preferred where available
• REACH Unaffected classification

The substitute parts listed maintain functional equivalence in transient suppression performance while offering alternative package options and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

LCE22A (Littelfuse Inc.) provides the closest electrical match to the ICT-22, with identical 22V reverse standoff voltage and comparable 35.5V clamping voltage. This part offers ROHS3 compliance and is available in Tape & Reel packaging. The operating temperature range is reduced to -55°C to 175°C compared to the ICT-22's -65°C to 175°C specification.

1.5KE22A (Taiwan Semiconductor Corporation) matches the 22V reverse standoff voltage with a 30.6V clamping voltage and higher peak pulse current capability (51A). This part is ROHS3 compliant and available in high inventory quantities. The lower clamping voltage may provide tighter transient suppression in applications where voltage headroom is critical.

1.5KE24A (Taiwan Semiconductor Corporation) offers a 20.5V reverse standoff voltage with 33.2V clamping voltage, suitable for applications requiring slightly higher voltage thresholds. ROHS3 compliance and substantial inventory availability support production requirements.

1.5KE27A (Taiwan Semiconductor Corporation) provides the highest reverse standoff voltage (23.1V) among substitutes with 37.5V clamping voltage. This part is appropriate for circuits requiring maximum voltage margin before suppression activation. ROHS3 compliance and the largest inventory quantity (30,100 pcs) ensure supply continuity.

LCE20A (Littelfuse Inc.) offers a 20V reverse standoff voltage with 32.4V clamping voltage and 46A peak pulse current. ROHS3 compliance is provided. This part is suitable for lower-voltage protection circuits.

All substitute parts maintain the 1500W peak pulse power rating and through-hole mounting configuration. Selection should be based on specific circuit voltage protection requirements, compliance mandates, and package form factor constraints.

Frequently Asked Questions (FAQ)

Q: Can the ICT-22 be directly replaced with a DO-201 package substitute?

A: Direct mechanical replacement requires PCB layout modification due to the different package form factors. The ICT-22 uses DO-13 (axial leads in close proximity), while substitute parts use DO-201 (DO-27, Axial) with different lead spacing. Electrical functionality is maintained across all listed substitutes.

Q: What is the primary difference between the ICT-22 and LCE22A?

A: Both parts share the same 22V reverse standoff voltage and 1500W peak pulse power rating. The LCE22A has a slightly higher clamping voltage (35.5V vs. 32V) and operates over a narrower temperature range (-55°C to 175°C vs. -65°C to 175°C). The LCE22A is ROHS3 compliant, while the ICT-22 is not.

Q: Why do the Taiwan Semiconductor Corporation 1.5KE series parts have different reverse standoff voltages?

A: The 1.5KE series offers multiple voltage ratings (1.5KE22A at 18.8V, 1.5KE24A at 20.5V, 1.5KE27A at 23.1V) to provide circuit designers with options for different protection thresholds. All maintain the same 1500W power rating and through-hole mounting configuration.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The original ICT-22 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the listed substitutes satisfy this criterion.

Q: What is the significance of the clamping voltage difference between substitutes?

A: Clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit during a transient event. Lower clamping voltages (1.5KE22A at 30.6V) provide tighter protection margins, while higher clamping voltages (1.5KE27A at 37.5V) allow greater voltage excursions. Selection depends on the protected component's voltage tolerance specifications.

Q: Can I use 1.5KE27A as a substitute for ICT-22 in all applications?

A: The 1.5KE27A has a higher reverse standoff voltage (23.1V vs. 22V) and higher clamping voltage (37.5V vs. 32V). It is suitable for applications where the circuit can tolerate these higher voltage thresholds. For circuits designed specifically for 22V protection, the LCE22A or 1.5KE22A are more appropriate selections.

Q: What is the operating temperature range difference, and does it matter?

A: The ICT-22 operates from -65°C to 175°C, while all substitute parts operate from -55°C to 175°C. The 10°C difference at the lower temperature limit is relevant only for applications requiring operation below -55°C. For standard industrial and commercial temperature ranges, this difference is not significant.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. The 1.5KE27A has the highest inventory availability (30,100 pcs), followed by 1.5KE22A (18,300 pcs) and 1.5KE24A (14,729 pcs). The LCE series parts have lower inventory levels (LCE22A: 998 pcs, LCE20A: 1,513 pcs). For high-volume production, the Taiwan Semiconductor Corporation 1.5KE series offers better supply assurance.