CD74HCT40103M Equivalent & Substitute Parts

Part Overview

The CD74HCT40103M is an 8-bit binary down counter IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This logic component operates as a synchronous counter with asynchronous reset, designed for applications requiring precise counting and timing control in digital systems. The part is currently in Last Time Buy status, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Logic Type	Binary Counter
Number of Bits per Element	8 Bit
Direction	Down
Number of Elements	1
Reset Type	Asynchronous
Timing	Synchronous
Count Rate	14 MHz
Trigger Type	Positive Edge
Voltage - Supply	4.5 V ~ 5.5 V
Operating Temperature	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the CD74HCT40103M is determined by strict equivalence across the following critical parameters:

Logic Function: Binary counter with 8-bit capacity, down-counting direction, single element configuration
Electrical Characteristics: 14 MHz count rate, positive edge trigger, synchronous timing with asynchronous reset
Power Supply: 4.5 V to 5.5 V operating range
Temperature Range: -55°C to 125°C operational limits
Package Specification: 16-SOIC surface mount package with 0.154" (3.90mm) width

The substitute part CD74HCT40103M96 maintains identical functional and electrical specifications across all critical parameters. Substitution is valid when all parameters listed above match between the main part and the candidate substitute.

Parameter Comparison

Parameter	CD74HCT40103M (Texas Instruments)	CD74HCT40103M96 (Harris Corporation)
Logic Type	Binary Counter	Binary Counter
Number of Bits per Element	8 Bit	8 Bit
Direction	Down	Down
Number of Elements	1	1
Reset Type	Asynchronous	Asynchronous
Timing	Synchronous	Synchronous
Count Rate	14 MHz	14 MHz
Trigger Type	Positive Edge	Positive Edge
Voltage - Supply	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount
Series	74HCT	74HCT
Base Product Number	74HCT40103	74HCT40103

Engineering Selection Recommendations

The CD74HCT40103M96 (Harris Corporation) is electrically and functionally equivalent to the CD74HCT40103M (Texas Instruments) across all specified parameters. Selection between these parts should be based on the following factors:

Product Status Consideration: The CD74HCT40103M is designated Last Time Buy, indicating limited future availability. The CD74HCT40103M96 is marked Obsolete, indicating it is no longer in active production from Harris Corporation.

Compliance Status: The CD74HCT40103M is ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited). The CD74HCT40103M96 is RoHS non-compliant. For applications subject to RoHS regulations or requiring compliance documentation, the CD74HCT40103M remains the preferred choice.

Packaging Format: The CD74HCT40103M is supplied in Tube packaging, while the CD74HCT40103M96 is supplied in Bulk packaging. Packaging format may affect handling, storage, and integration into automated assembly processes.

Inventory Availability: Current stock levels differ between suppliers. Verify real-time availability based on procurement requirements and lead time constraints.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT40103M96 be used as a direct replacement for the CD74HCT40103M?

A: Yes, the CD74HCT40103M96 is functionally and electrically equivalent across all critical parameters including logic type, bit width, count rate, voltage supply range, temperature range, and package specification. However, compliance status differences must be evaluated for your specific application requirements.

Q: What is the significance of the Last Time Buy status on the CD74HCT40103M?

A: Last Time Buy status indicates that Texas Instruments will discontinue production of this part. Existing inventory may be available for a limited period. For long-term supply assurance, alternative sources or equivalent parts should be identified and qualified.

Q: Are there any differences in the 16-SOIC package between these two parts?

A: Both parts use the identical 16-SOIC package specification with 0.154" (3.90mm) width. Pin configuration, spacing, and footprint are equivalent, allowing direct PCB layout compatibility.

Q: What does RoHS compliance status mean for part selection?

A: RoHS (Restriction of Hazardous Substances) compliance restricts the use of certain hazardous materials in electrical and electronic equipment. The CD74HCT40103M is ROHS3 Compliant, while the CD74HCT40103M96 is RoHS non-compliant. Applications subject to RoHS regulations or customer requirements must use the compliant part.

Q: How do Tube and Bulk packaging formats affect component handling?

A: Tube packaging provides individual component protection and is suitable for manual handling and smaller production runs. Bulk packaging is typically used for high-volume automated assembly. Packaging format affects storage, handling procedures, and integration into manufacturing workflows but does not affect electrical performance.

Q: What is Moisture Sensitivity Level (MSL) and why does it matter?

A: MSL indicates the component's sensitivity to moisture absorption during storage and handling. MSL 1 (Unlimited) means the component has no moisture sensitivity restrictions and can be stored and handled without special precautions. This is the least restrictive classification.

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