SN74HC191NG4 Equivalent & Substitute Parts

Part Overview

The SN74HC191NG4 is a 4-bit binary counter IC manufactured by Texas Instruments, designed for synchronous counting applications with up/down direction control. This component features a 24 MHz count rate, operates across 2V to 6V supply voltage, and is housed in a 16-DIP package suitable for through-hole mounting.

The SN74HC191NG4 is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and new builds.

Substiute Parts

SN74HC191NG4

Texas InstrumentsIn Stock: 1167SN74HC191NG4 Datasheet

Current PartRFQ

SN74HC191N

Texas InstrumentsIn Stock: 2253SN74HC191N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC191NG4 is determined by strict equivalence across the following critical parameters:

• Logic Type: Binary Counter (4-bit, single element)
• Electrical Performance: 24 MHz count rate, 2V–6V supply voltage range, -40°C to 85°C operating temperature
• Functional Characteristics: Up/down direction control, positive edge triggering, asynchronous reset, synchronous timing
• Physical Form Factor: 16-DIP package with 0.300" (7.62mm) pitch for through-hole mounting
• Compliance: ROHS3 compliance and REACH unaffected status

The SN74HC191N qualifies as a direct substitute based on identical electrical specifications, functional characteristics, and package form factor. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC191N is the primary substitute for the discontinued SN74HC191NG4. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications, functional characteristics, and physical packaging. The SN74HC191N carries active product status, ensuring ongoing availability and supply chain continuity.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications. The substitution preserves all critical design parameters including count rate, supply voltage range, operating temperature range, and package form factor.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC191N directly replace the SN74HC191NG4 in existing designs?

A: Yes. The SN74HC191N is electrically and functionally equivalent to the SN74HC191NG4. Both parts share identical specifications for count rate (24 MHz), supply voltage (2V–6V), operating temperature range (-40°C to 85°C), and 16-DIP package dimensions. Pin-for-pin compatibility is maintained.

Q: What is the difference between SN74HC191NG4 and SN74HC191N?

A: The primary differences are product status and packaging format. The SN74HC191NG4 is discontinued at DiGi Electronics and supplied in tape format, while the SN74HC191N maintains active status and is supplied in tube packaging. Electrical and functional specifications are identical.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the SN74HC191NG4 and SN74HC191N maintain ROHS3 compliance and REACH unaffected status. Regulatory requirements are satisfied by either part.

Q: Does the packaging format (tape vs. tube) affect circuit performance?

A: No. Packaging format affects only handling, storage, and assembly processes. Circuit performance and electrical characteristics remain identical regardless of packaging format.

Q: What are the critical parameters for substitution of 74HC191 binary counters?

A: Substitution requires equivalence in logic type (4-bit binary counter), count rate (24 MHz), supply voltage range (2V–6V), operating temperature (-40°C to 85°C), package type (16-DIP), and functional characteristics (up/down direction, positive edge trigger, asynchronous reset, synchronous timing).