74HCT191N,652 Binary Counter Equivalent & Substitute Parts

Part Overview

The 74HCT191N,652 is a 4-bit binary counter IC manufactured by NXP USA Inc., designed for synchronous up/down counting applications with a maximum count rate of 39 MHz. This component operates across a supply voltage range of 4.5 V to 5.5 V and is housed in a 16-DIP package suitable for through-hole mounting.

The 74HCT191N,652 is classified as obsolete, which necessitates identification of functionally equivalent substitute components for new designs or replacement applications. Substitute parts must maintain compatibility across critical electrical parameters including logic type, count direction, timing characteristics, and package configuration.

Substiute Parts

74HCT191N,652

NXP USA Inc.In Stock: 106874HCT191N,652 Datasheet

Current PartRFQ

CD74HCT191E

Harris CorporationIn Stock: 16506CD74HCT191E Datasheet

MFR RecommendedRFQ

SN74ALS169BN

Texas InstrumentsIn Stock: 3491SN74ALS169BN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT191N,652 is determined by strict alignment with the following critical parameters:

• Logic Type: Binary Counter (1 element, 4-bit configuration)
• Direction: Up/Down counting capability
• Timing: Synchronous operation
• Trigger Type: Positive edge-triggered
• Voltage Supply: 4.5 V ~ 5.5 V compatibility
• Package: 16-DIP form factor with 0.300" (7.62mm) pitch
• Mounting: Through-hole configuration

The identified substitute parts CD74HCT191E and SN74ALS169BN satisfy these core functional and physical requirements. Both components operate as 4-bit binary counters with synchronous, positive-edge triggering and identical supply voltage specifications. Package compatibility is maintained across all candidates.

Parameter Comparison

Engineering Selection Recommendations

CD74HCT191E (Harris Corporation): This substitute maintains series compatibility within the 74HCT logic family and operates within identical supply voltage parameters. The component exhibits a reduced count rate of 30 MHz compared to the original 39 MHz specification. The extended operating temperature range (-55°C to 125°C) provides broader environmental coverage. However, this part is classified as RoHS non-compliant, which may restrict use in applications subject to RoHS3 regulatory requirements. Product status is obsolete.

SN74ALS169BN (Texas Instruments): This substitute operates as an active product with ROHS3 compliance, supporting modern procurement and regulatory requirements. The count rate of 40 MHz exceeds the original specification, providing performance headroom. The operating temperature range is restricted to 0°C to 70°C, which narrows the lower and upper temperature boundaries compared to the original part. This component is suitable for applications operating within standard industrial temperature ranges where RoHS compliance is mandated.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT191E directly replace 74HCT191N,652 in existing designs?

A: CD74HCT191E maintains functional compatibility across logic type, bit configuration, count direction, timing, trigger type, supply voltage, and package form factor. The reduced count rate of 30 MHz versus 39 MHz must be evaluated against circuit timing requirements. RoHS non-compliance status should be assessed against applicable regulatory constraints.

Q: What are the temperature operating differences between substitutes?

A: The original 74HCT191N,652 operates from -40°C to 125°C. CD74HCT191E extends the lower limit to -55°C, while SN74ALS169BN restricts operation to 0°C to 70°C. Application thermal requirements determine which substitute is appropriate.

Q: Why does SN74ALS169BN use a different series designation (74ALS vs. 74HCT)?

A: SN74ALS169BN belongs to the 74ALS logic family rather than 74HCT. Both families maintain compatible electrical characteristics for supply voltage (4.5 V ~ 5.5 V), package configuration (16-DIP), and functional operation (4-bit synchronous binary counter with up/down capability). Series differences reflect manufacturing process variations but do not prevent functional substitution when electrical parameters align.

Q: Are all three parts pin-compatible?

A: All three components utilize the 16-DIP package with 0.300" (7.62mm) pitch, ensuring mechanical and pin-level compatibility for through-hole mounting applications.

Q: Which substitute is recommended for new designs?

A: Selection depends on specific application requirements. SN74ALS169BN is the active product with current availability and ROHS3 compliance, suitable for designs requiring modern component status and regulatory adherence. CD74HCT191E provides series continuity with the original part but carries obsolete status and RoHS non-compliance considerations.