74HC40105N,652 Equivalent & Substitute Parts

Part Overview

The 74HC40105N,652 is an asynchronous FIFO (First-In-First-Out) memory circuit manufactured by NXP USA Inc. in a 16-DIP package configuration. This device provides 64-bit storage capacity organized as 16 words × 4 bits, with a maximum data rate of 36MHz and access time of 34 nanoseconds. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing system support and new design implementations.

Substiute Parts

74HC40105N,652

NXP USA Inc.In Stock: 109574HC40105N,652 Datasheet

Current PartRFQ

CD74HC40105E

Harris CorporationIn Stock: 1197CD74HC40105E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC40105N,652 is determined by the following critical parameters:

• Memory organization: 64-bit capacity (16 × 4 configuration)
• Function type: Asynchronous FIFO operation
• Bus architecture: Uni-directional data flow
• Package form factor: 16-DIP through-hole mounting
• Voltage supply compatibility: 2V ~ 6V operating range
• Pin count and pinout alignment: 16-pin DIP package

The CD74HC40105E qualifies as a substitute based on matching memory size, asynchronous FIFO function, uni-directional bus architecture, and identical 16-DIP package configuration. Both devices share the same base product number (74HC40105) and are designed for equivalent circuit-level functionality.

Parameter Comparison

Engineering Selection Recommendations

Selection between the 74HC40105N,652 and CD74HC40105E should be based on the following factors:

The 74HC40105N,652 maintains RoHS3 compliance status, which may be required for applications subject to environmental and hazardous substance restrictions. The CD74HC40105E is classified as RoHS non-compliant and should be selected only for legacy system maintenance or applications where RoHS compliance is not mandated.

The CD74HC40105E provides an extended lower operating temperature limit of -55°C compared to the -40°C minimum of the 74HC40105N,652, making it suitable for applications requiring enhanced cold-temperature performance.

Both devices share identical electrical specifications for memory capacity, function type, voltage supply range, and package configuration, ensuring functional equivalence at the circuit level. Pin-for-pin compatibility is maintained between both parts.

Frequently Asked Questions (FAQ)

Q: Are the 74HC40105N,652 and CD74HC40105E pin-for-pin compatible?

A: Yes. Both devices use the 16-DIP package with identical pinout configuration. Direct socket substitution is possible without circuit modification.

Q: What is the primary difference between these two parts?

A: The main differences are manufacturer origin (NXP vs. Harris), RoHS compliance status (RoHS3 compliant vs. non-compliant), and operating temperature range (-40°C to 125°C vs. -55°C to 125°C).

Q: Can the CD74HC40105E be used in applications requiring RoHS compliance?

A: No. The CD74HC40105E is RoHS non-compliant. Applications subject to RoHS requirements must use the 74HC40105N,652 or equivalent RoHS-compliant alternatives.

Q: Are there differences in data rate or access time between these parts?

A: The 74HC40105N,652 specifies 36MHz data rate and 34ns access time. The CD74HC40105E does not provide these specifications in the available documentation, though both devices are functionally equivalent asynchronous FIFO circuits.

Q: What mounting considerations apply to both parts?

A: Both parts are through-hole mounted 16-DIP devices with 0.300-inch (7.62mm) row spacing, compatible with standard DIP sockets and PCB through-hole footprints.