74HC40103N,652 Equivalent & Substitute Parts

Part Overview

The 74HC40103N,652 is an 8-bit binary counter IC manufactured by NXP USA Inc., designed for synchronous down-counting applications with positive edge triggering. This through-hole mounted component operates across a 2V to 6V supply range with a maximum count rate of 32 MHz and asynchronous reset capability. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

74HC40103N,652

NXP USA Inc.In Stock: 71174HC40103N,652 Datasheet

Current PartRFQ

CD74HC40103E

Texas InstrumentsIn Stock: 1125CD74HC40103E Datasheet

DirectRFQ

CD74HC40103M

Texas InstrumentsIn Stock: 1962CD74HC40103M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74HC40103N,652 is determined by functional equivalence across the following critical parameters:

• Logic Type: Binary Counter (8-bit, single element)
• Direction: Down counting
• Reset: Asynchronous
• Timing: Synchronous
• Trigger Type: Positive Edge
• Voltage Supply: 2V ~ 6V compatibility
• RoHS Compliance: ROHS3 Compliant

Substitute parts must maintain identical functional specifications while accommodating variations in packaging format (through-hole DIP versus surface-mount SOIC) and product status. The base product number 74HC40103 identifies the functional family across all substitutes.

Parameter Comparison

Engineering Selection Recommendations

CD74HC40103E (Texas Instruments) is the direct functional equivalent in through-hole DIP packaging format. This part maintains identical pin configuration and package dimensions (16-PDIP, 0.300" pitch) as the original 74HC40103N,652, enabling direct board-level substitution without layout modifications. The part carries Active product status with full manufacturing support and ROHS3 compliance certification.

CD74HC40103M (Texas Instruments) provides functional equivalence in surface-mount SOIC packaging (16-SOIC, 0.154" width). This option is suitable for designs transitioning to surface-mount assembly or for new board layouts. The part is designated Last Time Buy status, indicating limited future availability. ROHS3 compliance and extended operating temperature range (-55°C to 125°C) are maintained.

Both Texas Instruments substitutes operate at 18 MHz maximum count rate, which is lower than the original 32 MHz specification. Design applications requiring the full 32 MHz performance must evaluate timing-critical circuit behavior before substitution.

Frequently Asked Questions (FAQ)

Q: Can CD74HC40103E directly replace 74HC40103N,652 on existing PCBs?

A: Yes. CD74HC40103E maintains identical 16-DIP package dimensions (0.300", 7.62mm pitch) and pin configuration, enabling direct through-hole substitution without PCB layout changes.

Q: What is the functional difference between CD74HC40103E and CD74HC40103M?

A: Both parts are functionally identical 8-bit binary down counters with asynchronous reset and positive edge triggering. The difference is packaging: CD74HC40103E uses through-hole DIP format, while CD74HC40103M uses surface-mount SOIC format. PCB assembly method determines which is appropriate.

Q: Does the 18 MHz count rate of the Texas Instruments parts affect compatibility?

A: The Texas Instruments substitutes operate at 18 MHz maximum, compared to 32 MHz for the original part. Applications operating below 18 MHz are unaffected. Designs requiring higher count rates must evaluate timing margins and circuit behavior before substitution.

Q: Are all parts RoHS compliant?

A: Yes. The 74HC40103N,652, CD74HC40103E, and CD74HC40103M are all ROHS3 compliant.

Q: What is the temperature operating range difference?

A: The original 74HC40103N,652 operates from -40°C to 125°C. Both Texas Instruments substitutes extend the lower limit to -55°C, providing wider temperature coverage for -55°C to 125°C operation.

Q: Why is CD74HC40103M marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for this product. Existing inventory is available, but future production is not planned. For long-term designs, CD74HC40103E (Active status) is the preferred choice.