HT1204DC Equivalent & Substitute Parts Reference

Part Overview

The HT1204DC is a high-temperature analog switch IC manufactured by Honeywell Aerospace, designed for applications requiring operation in extreme thermal environments. This 4-channel SPST switch IC operates across a wide temperature range of -55°C to 225°C and is housed in a 14-CDIP package. The device is classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system support, design updates, and production continuity.

Substiute Parts

HT1204DC

Honeywell AerospaceIn Stock: 747HT1204DC Datasheet

Current PartRFQ

CD54HC4066F3A

Texas InstrumentsIn Stock: 98814CD54HC4066F3A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the HT1204DC is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Package Type: 14-CDIP (0.300", 7.62mm) — physical and pin compatibility requirement
• Switch Configuration: SPST (Single Pole Single Throw) with 1:1 multiplexer/demultiplexer circuit
• Number of Channels: 4 independent switch circuits
• On-State Resistance: Maximum 100Ω (substitute must not exceed this specification)
• Supply Voltage Range: Minimum overlap with 5V ~ 11V operating window
• Mounting Type: Through Hole configuration

Temperature Consideration: The HT1204DC operates to 225°C. Substitute parts with lower maximum operating temperatures (such as -55°C ~ 125°C) are functionally compatible for applications not requiring the full high-temperature range of the original part. However, they cannot be used in applications demanding operation above their specified maximum temperature.

The CD54HC4066F3A meets all critical electrical and mechanical parameters within the constraints of its lower temperature rating.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The CD54HC4066F3A is a valid functional substitute for the HT1204DC in applications where the operating temperature requirement does not exceed 125°C. Both devices share identical package geometry (14-CDIP), channel count (4), switch configuration (SPST 1:1), and mounting type (Through Hole).

Key Considerations:

1. Temperature Limitation: The CD54HC4066F3A maximum operating temperature of 125°C is 100°C lower than the HT1204DC specification of 225°C. Substitution is only appropriate for applications operating within the -55°C to 125°C range.

2. Supply Voltage Range: The CD54HC4066F3A operates from 2V to 10V, while the HT1204DC operates from 5V to 11V. The overlap range is 5V to 10V. Applications requiring operation at 10.5V or 11V cannot use the CD54HC4066F3A.

3. On-State Resistance: The CD54HC4066F3A exhibits superior performance with a maximum on-state resistance of 70Ω compared to the HT1204DC specification of 100Ω. This represents a 30% improvement and is compatible with all applications designed for the original part.

4. Product Status and Compliance: The CD54HC4066F3A is in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The HT1204DC is obsolete, making the substitute the preferred choice for new designs and ongoing production support.

5. Pinout Compatibility: Both devices use the 14-CDIP package with identical pin assignments, enabling direct socket replacement without circuit board modifications.

Frequently Asked Questions (FAQ)

Q: Can the CD54HC4066F3A directly replace the HT1204DC in all applications?

A: Direct replacement is possible only in applications where the maximum operating temperature does not exceed 125°C and the supply voltage remains within the 5V to 10V range. Applications requiring operation above 125°C or at supply voltages of 10.5V or 11V require alternative solutions.

Q: What is the significance of the lower on-state resistance in the CD54HC4066F3A?

A: The 70Ω maximum on-state resistance of the CD54HC4066F3A is lower than the 100Ω specification of the HT1204DC. This represents improved electrical performance and is fully compatible with designs that accommodate the original 100Ω specification. No circuit modifications are required.

Q: Are the packages physically identical?

A: Yes. Both the HT1204DC and CD54HC4066F3A use the 14-CDIP package with 0.300" (7.62mm) spacing. Pin assignments are identical, enabling direct socket replacement without printed circuit board redesign.

Q: Why is the HT1204DC classified as obsolete?

A: The HT1204DC is an older Honeywell Aerospace component that has been discontinued. The CD54HC4066F3A from Texas Instruments provides equivalent functionality with modern manufacturing standards, active production status, and RoHS3 compliance.

Q: What does ROHS3 compliance mean for the CD54HC4066F3A?

A: ROHS3 compliance indicates the device meets the Restriction of Hazardous Substances Directive 3, restricting the use of specific hazardous materials in electrical and electronic equipment. This is a regulatory requirement for many markets and applications. The HT1204DC is RoHS non-compliant, making the CD54HC4066F3A the preferred choice for regulated environments.

Q: Can I use the CD54HC4066F3A in a high-temperature application requiring 200°C operation?

A: No. The CD54HC4066F3A has a maximum operating temperature of 125°C and cannot be used in applications requiring operation above this limit. For high-temperature applications exceeding 125°C, alternative components rated for the required temperature range must be identified.

Q: What is the supply voltage overlap between these two devices?

A: The HT1204DC operates from 5V to 11V, while the CD54HC4066F3A operates from 2V to 10V. The compatible overlap range is 5V to 10V. Applications using supply voltages of 10.5V or 11V cannot use the CD54HC4066F3A.

Q: Is the CD54HC4066F3A available in high volume?

A: Yes. The CD54HC4066F3A is in active production status with 98,788 pieces currently in stock, ensuring reliable availability for production requirements and design updates.