ICT-45 Equivalent & Substitute Parts

Part Overview

The ICT-45 is a unidirectional 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 in active production status with 1074 units in stock inventory.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across different manufacturers and package configurations while preserving the core protective function in circuit applications.

Substiute Parts

ICT-45

Microchip TechnologyIn Stock: 1168ICT-45 Datasheet

Current PartRFQ

1.5KE47A

Taiwan Semiconductor CorporationIn Stock: 368961.5KE47A Datasheet

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1.5KE51A

MeritekIn Stock: 15511.5KE51A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

• Unidirectional channel configuration (1 channel required)
• Through-hole mounting type
• Peak pulse power rating of 1500W (1.5kW)
• Zener diode type classification
• General-purpose transient voltage protection application
• Operating temperature range compatibility

Voltage Parameter Tolerance: Substitute parts must operate within the same voltage protection class. The ICT-45 operates with a 45V reverse standoff and 70V clamping voltage. Substitute parts with comparable reverse standoff voltages (40V to 50V range) and clamping voltages (64V to 71V range) maintain functional equivalence in circuit protection.

Current Handling: Peak pulse current ratings of 19A to 24A are acceptable for substitution, as these values remain within the 1500W power dissipation envelope.

Package Compatibility: While the ICT-45 uses DO-13 packaging, substitute parts in DO-201 (DO-27, Axial) configurations are mechanically compatible for through-hole board mounting applications.

Parameter Comparison

Engineering Selection Recommendations

ICT-45 (Microchip Technology)

• Active product status with established supply chain (1074 units in stock)
• RoHS non-compliant classification
• Extended lower operating temperature limit (-65°C minimum) suitable for extreme cold environments
• DO-13 package provides compact form factor for space-constrained applications

1.5KE47A (Taiwan Semiconductor Corporation)

• Active product status with high inventory availability (36829 units in stock)
• ROHS3 compliant, meeting modern environmental and regulatory requirements
• Tape & Reel packaging suitable for automated assembly processes
• Slightly lower reverse standoff voltage (40.2V) with proportionally lower clamping voltage (64.8V)
• Operating temperature range limited to -55°C minimum

1.5KE51A (Meritek)

• Active product status with moderate inventory (1529 units in stock)
• Clamping voltage (70.1V) matches ICT-45 specification precisely
• Strip packaging configuration
• Operating temperature range limited to -55°C minimum
• Regulatory compliance status not specified in available data

Selection between these parts depends on compliance requirements, supply chain preferences, and thermal operating environment specifications.

Frequently Asked Questions (FAQ)

Q: Can the 1.5KE47A substitute for the ICT-45 in all applications?

A: The 1.5KE47A operates with a lower reverse standoff voltage (40.2V vs. 45V) and lower clamping voltage (64.8V vs. 70V). Substitution is valid only in circuits where the lower voltage thresholds provide adequate protection. Circuit voltage levels must be verified against the 1.5KE47A specifications.

Q: What is the primary difference between the 1.5KE51A and ICT-45?

A: The 1.5KE51A provides nearly identical clamping voltage (70.1V) and higher peak pulse current (21.7A vs. 19A). The primary difference is the package configuration (Axial/DO-201 vs. DO-13) and the minimum operating temperature (-55°C vs. -65°C). Both maintain 1500W peak pulse power rating.

Q: Are there packaging compatibility concerns when substituting DO-13 with DO-201?

A: Both DO-13 and DO-201 are through-hole axial packages compatible with standard PCB mounting. DO-201 components are physically larger. Board layout and hole spacing must accommodate the larger package dimensions. Both packages use identical lead spacing for through-hole insertion.

Q: Does RoHS compliance affect substitution decisions?

A: RoHS compliance is a regulatory and procurement consideration. The ICT-45 is RoHS non-compliant, while the 1.5KE47A is ROHS3 compliant. Selection depends on end-product regulatory requirements and customer specifications. Electrical performance is not affected by RoHS status.

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

A: The ICT-45 operates to -65°C minimum, while substitute parts operate to -55°C minimum. For applications in extreme cold environments below -55°C, the ICT-45 is required. For standard industrial temperature ranges (-40°C to +85°C), all three parts are suitable.

Q: Can these parts be used interchangeably in automated assembly?

A: The 1.5KE47A is supplied in Tape & Reel packaging, optimized for automated pick-and-place assembly. The ICT-45 (Bulk) and 1.5KE51A (Strip) require manual handling or custom feeder configurations. Assembly process compatibility must be evaluated based on production equipment capabilities.

Q: How do peak pulse current ratings affect circuit protection?

A: All three parts are rated for 1500W peak pulse power. The ICT-45 handles 19A, the 1.5KE47A handles 24A, and the 1.5KE51A handles 21.7A. Higher current ratings provide additional margin for transient events. Selection should match or exceed the maximum transient current expected in the protected circuit.