74HC191N,652 Binary Counter IC Equivalent & Substitute Parts

Part Overview

The 74HC191N,652 is a 4-bit binary counter IC manufactured by NXP USA Inc., designed for synchronous up/down counting applications with positive edge triggering. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and procurement continuity. The part operates across a supply voltage range of 2V to 6V with an asynchronous reset function and a maximum count rate of 39 MHz.

Substiute Parts

74HC191N,652

NXP USA Inc.In Stock: 108174HC191N,652 Datasheet

Current PartRFQ

CD74HC191E

Harris CorporationIn Stock: 2012CD74HC191E Datasheet

DirectRFQ

SN74HC191N

Texas InstrumentsIn Stock: 2253SN74HC191N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HC191N,652 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

• Logic Type: Binary Counter (identical function)
• Number of Bits per Element: 4 (identical bit width)
• Direction: Up, Down (identical counting capability)
• Reset: Asynchronous (identical reset behavior)
• Timing: Synchronous (identical timing architecture)
• Trigger Type: Positive Edge (identical trigger mechanism)
• Package / Case: 16-DIP (0.300", 7.62mm) (identical physical form factor)
• Mounting Type: Through Hole (identical mounting method)
• Voltage - Supply: 2 V ~ 6 V (compatible operating range)

The identified substitute parts maintain these core parameters while operating within acceptable variations in count rate and temperature range specifications.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring the 74HC191N,652, the SN74HC191N manufactured by Texas Instruments is the primary substitute. This part maintains full functional equivalence across all critical parameters, carries Active product status ensuring long-term availability, and maintains ROHS3 compliance consistent with the original component. The SN74HC191N operates within the same supply voltage range and package form factor, enabling direct substitution in existing designs.

The CD74HC191E from Harris Corporation provides an alternative substitute with extended lower temperature operation (-55°C minimum) and equivalent count rate performance (35 MHz). However, this part carries RoHS non-compliant status, which may restrict its use in applications subject to environmental regulations or customer compliance requirements.

Selection between SN74HC191N and CD74HC191E depends on specific application requirements regarding product lifecycle status and regulatory compliance. For new designs or applications with RoHS compliance mandates, SN74HC191N is the appropriate choice.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC191N directly replace the 74HC191N,652 in existing circuit boards?

A: Yes. The SN74HC191N maintains identical pin configuration, package dimensions (16-DIP 0.300"), and all functional parameters including 4-bit binary counter operation, up/down direction control, asynchronous reset, and positive edge triggering. Through-hole mounting compatibility is preserved.

Q: What is the significance of the count rate difference between these parts?

A: The count rate specification (39 MHz for 74HC191N,652, 35 MHz for CD74HC191E, 24 MHz for SN74HC191N) represents the maximum frequency at which the counter can reliably operate. For applications operating below these maximum frequencies, all three parts are functionally equivalent. Applications requiring operation near or above 24 MHz should verify that the selected substitute meets the specific timing requirements of the design.

Q: Why is the CD74HC191E listed as RoHS non-compliant?

A: The CD74HC191E was manufactured prior to or outside the scope of RoHS3 compliance requirements. Applications subject to RoHS compliance mandates, including EU market requirements or customer specifications, should utilize the SN74HC191N or 74HC191N,652, both of which carry ROHS3 Compliant status.

Q: Are there differences in operating temperature ranges between substitutes?

A: Yes. The 74HC191N,652 and SN74HC191N operate from -40°C to 125°C and -40°C to 85°C respectively. The CD74HC191E extends the lower temperature limit to -55°C. For applications operating below -40°C, the CD74HC191E is the only qualified substitute. For standard industrial temperature ranges (-40°C to 85°C), all three parts are suitable.

Q: What packaging format is used for these counter ICs?

A: All three substitute parts use 16-DIP (Dual In-line Package) with 0.300" (7.62mm) row spacing. This through-hole package format is identical across all parts, ensuring mechanical compatibility with existing PCB designs without layout modifications.