74HCT194N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT194N,652 is a 4-bit bidirectional universal shift register manufactured by NXP USA Inc. in a 16-DIP through-hole package. This logic component operates at 4.5V to 5.5V supply voltage with a temperature range of -40°C to 125°C. The device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance, repair, and legacy product support.

Substiute Parts

74HCT194N,652

NXP USA Inc.In Stock: 98174HCT194N,652 Datasheet

Current PartRFQ

CD74HCT194E

Harris CorporationIn Stock: 13744CD74HCT194E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT194N,652 is determined by the following critical parameters:

• Logic Series Compatibility: Both parts must belong to the 74HCT series to ensure functional equivalence
• Register Configuration: Bidirectional, 1 element, 4-bit universal shift register architecture
• Electrical Specifications: Supply voltage range 4.5V to 5.5V and push-pull output type
• Package Compatibility: 16-DIP through-hole package with 0.300" (7.62mm) pitch
• Pin Configuration: Identical pinout required for direct socket replacement

The CD74HCT194E qualifies as a manufacturer-recommended substitute based on matching all critical parameters within the allowed tolerance range.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT194E is a direct functional equivalent for the 74HCT194N,652 based on matching electrical specifications, package configuration, and logic architecture. Both devices are obsolete products, indicating limited availability through standard distribution channels.

The CD74HCT194E offers an extended lower operating temperature limit of -55°C compared to the -40°C minimum of the original part, providing broader environmental compatibility for applications requiring enhanced cold-temperature performance.

RoHS compliance differs between the two parts: the 74HCT194N,652 is ROHS3 compliant, while the CD74HCT194E is RoHS non-compliant. This distinction is relevant for applications subject to RoHS regulatory requirements or customer specifications mandating RoHS compliance.

Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, confirming equivalent export control and tariff treatment.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT194E be used as a direct replacement for the 74HCT194N,652?

A: Yes. Both parts share identical logic architecture, electrical specifications, and 16-DIP package configuration. Direct socket replacement is possible without circuit modification.

Q: What is the difference in operating temperature range?

A: The CD74HCT194E operates from -55°C to 125°C, while the 74HCT194N,652 operates from -40°C to 125°C. The substitute part supports a wider lower temperature range, suitable for applications requiring enhanced cold-temperature performance.

Q: Are there RoHS compliance differences?

A: Yes. The 74HCT194N,652 is ROHS3 compliant, while the CD74HCT194E is RoHS non-compliant. Applications subject to RoHS regulatory requirements should verify compliance requirements before substitution.

Q: Do both parts have identical pinouts?

A: Yes. Both the 74HCT194N,652 and CD74HCT194E use the 16-DIP package with identical pin assignments, enabling direct replacement without PCB modification.

Q: What supply voltage range do these parts require?

A: Both parts operate at 4.5V to 5.5V supply voltage. Ensure your circuit provides voltage within this range for proper device operation.

Q: Are both parts still in production?

A: No. Both the 74HCT194N,652 and CD74HCT194E are classified as obsolete. Availability is limited to existing inventory through component distributors.