ICT-45C Equivalent & Substitute Parts Reference

Part Overview

The ICT-45C is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose transient voltage protection applications. This through-hole component operates with a 45V reverse standoff voltage and provides 70V maximum clamping voltage at peak pulse current. The part is currently active in production and maintains RoHS non-compliant status with unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter ranges. Alternative models may be required due to inventory availability, packaging format preferences, or compliance requirement alignment.

Substiute Parts

ICT-45C

Microchip TechnologyIn Stock: 1065ICT-45C Datasheet

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1.5KE47CA

Diotec SemiconductorIn Stock: 148621.5KE47CA Datasheet

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1.5KE51CA

Taiwan Semiconductor CorporationIn Stock: 35071.5KE51CA Datasheet

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1.5KE56CA

Taiwan Semiconductor CorporationIn Stock: 32661.5KE56CA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ICT-45C are qualified based on the following electrical and mechanical criteria:

Primary Substitution Parameters:

• Bidirectional Zener TVS diode topology with single channel configuration
• Peak pulse power rating of 1500W (1.5kW)
• Through-hole mounting technology
• Reverse standoff voltage within the 40V to 48V range
• Clamping voltage performance between 64.8V and 77V at specified peak pulse current
• Peak pulse current capability between 19A and 24A
• Operating temperature range supporting minimum -50°C to 175°C

Package Compatibility: The ICT-45C utilizes DO-13 packaging. Substitute parts employ DO-201 (DO-201AA, DO-27, Axial) packaging, which represents a different through-hole form factor. Both package types are through-hole mounted and suitable for general-purpose transient protection applications.

Electrical Performance Alignment: All substitute parts maintain the 1500W peak pulse power specification and operate within compatible voltage ranges for transient suppression. Reverse standoff voltages and clamping characteristics remain within acceptable tolerance bands for equivalent circuit protection.

Parameter Comparison

Engineering Selection Recommendations

1.5KE51CA (Taiwan Semiconductor Corporation)

The 1.5KE51CA provides the closest electrical alignment to the ICT-45C specification. This part maintains a 43.6V reverse standoff voltage and 70.1V clamping voltage, matching the primary performance characteristics of the main part. The 22A peak pulse current and 1500W power rating remain consistent. This substitute carries ROHS3 compliance certification and REACH unaffected status, offering improved regulatory alignment compared to the ICT-45C. Operating temperature range extends to -55°C minimum, supporting the majority of thermal requirements. Packaging transitions from DO-13 to DO-201 format, requiring PCB layout modification.

1.5KE56CA (Taiwan Semiconductor Corporation)

The 1.5KE56CA operates at a higher 47.8V reverse standoff voltage with 77V clamping performance. This part delivers 20A peak pulse current within the 1500W power envelope. AEC-Q101 automotive qualification and ROHS3 compliance provide enhanced certification credentials. Operating temperature range of -55 to 175°C supports equivalent thermal performance. The higher clamping voltage may provide additional transient margin in applications requiring enhanced overvoltage protection. DO-201 packaging applies.

1.5KE47CA (Diotec Semiconductor)

The 1.5KE47CA operates at the lowest reverse standoff voltage of 40.2V with 64.8V clamping performance. This part delivers the highest peak pulse current at 24A within the 1500W power specification. Operating temperature minimum of -50°C represents the narrowest thermal range among substitutes. RoHS status is not applicable, and REACH status remains vendor undefined. This substitute is suitable for applications where lower standoff voltage and higher current capacity are acceptable trade-offs.

Frequently Asked Questions (FAQ)

Q: Can the ICT-45C be directly replaced with 1.5KE51CA without PCB modification?

A: No. The ICT-45C uses DO-13 through-hole packaging while the 1.5KE51CA uses DO-201 packaging. These represent different physical form factors requiring PCB layout changes. Pin spacing and lead diameter differ between packages.

Q: What is the primary electrical difference between the three substitute parts?

A: The 1.5KE47CA operates at the lowest reverse standoff voltage (40.2V) with the highest peak pulse current (24A). The 1.5KE51CA provides the closest voltage match to the ICT-45C at 43.6V standoff and 70.1V clamping. The 1.5KE56CA operates at the highest standoff voltage (47.8V) with 77V clamping performance.

Q: Which substitute part offers the best regulatory compliance?

A: Both the 1.5KE51CA and 1.5KE56CA carry ROHS3 compliance certification. The 1.5KE56CA additionally holds AEC-Q101 automotive qualification. The ICT-45C is RoHS non-compliant, and the 1.5KE47CA has not applicable RoHS status.

Q: Are all substitute parts suitable for the same temperature range as the ICT-45C?

A: No. The ICT-45C operates from -65°C to 175°C. The 1.5KE47CA operates from -50°C to 175°C, and both Taiwan Semiconductor parts operate from -55°C to 175°C. Applications requiring operation below -50°C cannot use the 1.5KE47CA.

Q: What is the clamping voltage difference between the ICT-45C and substitute parts?

A: The ICT-45C clamps at 70V. The 1.5KE47CA clamps at 64.8V (lower protection threshold), the 1.5KE51CA clamps at 70.1V (equivalent), and the 1.5KE56CA clamps at 77V (higher protection threshold).

Q: Can packaging differences affect circuit performance?

A: Packaging differences affect PCB layout, lead inductance, and thermal dissipation characteristics. DO-13 and DO-201 packages have different physical dimensions and lead configurations. Circuit performance remains equivalent if proper PCB layout practices are applied for the new package form factor.

Q: Which substitute part has the highest inventory availability?

A: The 1.5KE47CA maintains the highest inventory at 14,829 pieces. The 1.5KE56CA has 3,200 pieces, and the 1.5KE51CA has 3,448 pieces in stock.

Q: Are all parts suitable for general-purpose transient voltage protection?

A: Yes. All parts, including the ICT-45C and the three substitutes, are classified for general-purpose applications with no power line protection designation.