74HC191D,652 Equivalent & Substitute Parts

Part Overview

The 74HC191D,652 is a 4-bit binary counter IC manufactured by Nexperia USA Inc., designed for synchronous counting applications with asynchronous reset capability. This logic component operates across a 2V to 6V supply range and supports both up and down counting directions with positive edge triggering. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

74HC191D,652

Nexperia USA Inc.In Stock: 91274HC191D,652 Datasheet

Current PartRFQ

CD74HC191M96

Texas InstrumentsIn Stock: 5261CD74HC191M96 Datasheet

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CD74HC191MT

Texas InstrumentsIn Stock: 1935CD74HC191MT Datasheet

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SN74HC191D

Texas InstrumentsIn Stock: 1925SN74HC191D Datasheet

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SN74HC191DR

Texas InstrumentsIn Stock: 5129SN74HC191DR Datasheet

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SN74HC191DT

Texas InstrumentsIn Stock: 1103SN74HC191DT Datasheet

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SN74HC191NSR

Texas InstrumentsIn Stock: 4768SN74HC191NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC191D,652 is determined by the following critical parameters:

Core Functional Parameters:

• Base product number (74HC191 series)
• Logic type (Binary Counter)
• Number of bits per element (4-bit)
• Direction capability (Up, Down)
• Reset type (Asynchronous)
• Timing (Synchronous)
• Trigger type (Positive Edge)
• Supply voltage range (2V ~ 6V minimum compatibility)

Physical & Environmental Parameters:

• Mounting type (Surface Mount)
• Package type (16-SOIC or 16-SO)
• Operating temperature range (must support -40°C minimum)
• RoHS compliance (ROHS3)
• MSL rating (1 - Unlimited)

Substitute parts must maintain identical functional specifications and support the same voltage and temperature operating ranges. Package variations (16-SOIC with different widths or 16-SO) are acceptable provided pin compatibility is maintained within the 74HC191 series.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain functional equivalence to the 74HC191D,652 across core counter specifications. Selection should prioritize product status and long-term availability:

Preferred Substitutes (Active Status):

• CD74HC191M96: Active status with extended temperature range (-55°C ~ 125°C), 35 MHz count rate, Tape & Reel packaging
• SN74HC191DR: Active status, 24 MHz count rate, Tape & Reel packaging, standard temperature range (-40°C ~ 85°C)
• SN74HC191NSR: Active status, 24 MHz count rate, Tape & Reel packaging, 16-SO package variant (0.209" width)

Secondary Substitutes (Last Time Buy Status):

• CD74HC191MT: Last Time Buy status, extended temperature range (-55°C ~ 125°C), 35 MHz count rate
• SN74HC191D: Last Time Buy status, 24 MHz count rate, Tube packaging
• SN74HC191DT: Last Time Buy status, 24 MHz count rate, Tape & Reel packaging

All substitutes maintain ROHS3 compliance and MSL 1 rating. The 74HC191D,652 operates at 39 MHz; substitutes with lower count rates (24-35 MHz) remain functionally compatible for applications not requiring maximum frequency operation. Temperature range variations should be evaluated against specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC191DR as a direct replacement for 74HC191D,652?

A: Yes. Both parts share identical functional specifications (4-bit binary counter, up/down direction, asynchronous reset, synchronous timing, positive edge trigger) and operate within the same 2V ~ 6V supply range. The SN74HC191DR is actively manufactured by Texas Instruments and maintains ROHS3 compliance. The primary difference is the count rate (24 MHz vs. 39 MHz); this substitution is valid for applications where the lower frequency is acceptable.

Q: What is the difference between CD74HC191M96 and CD74HC191MT?

A: Both are Texas Instruments 74HC191 binary counters with identical functional specifications and 35 MHz count rate. CD74HC191M96 is actively manufactured, while CD74HC191MT is Last Time Buy status. Both support the extended temperature range of -55°C ~ 125°C. For new designs, CD74HC191M96 is recommended due to active production status.

Q: Are there package differences I need to consider?

A: Most substitutes use the 16-SOIC package with 0.154" (3.90mm) width, matching the original 74HC191D,652. The exception is SN74HC191NSR, which uses a 16-SO package with 0.209" (5.30mm) width. Both package types are surface-mount compatible; verify PCB layout compatibility before selection.

Q: Why do some substitutes have lower count rates (24 MHz vs. 39 MHz)?

A: Count rate variations reflect different manufacturing processes and specifications across manufacturers. All listed substitutes maintain synchronous counter operation and positive edge triggering. Applications requiring maximum frequency operation should prioritize CD74HC191M96 or CD74HC191MT (35 MHz) over the 24 MHz alternatives.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original 74HC191D,652 specifications.

Q: Which substitute should I choose for long-term production?

A: SN74HC191DR or CD74HC191M96 are recommended for new production due to active manufacturing status. SN74HC191NSR is also actively produced and offers an alternative package option. Avoid Last Time Buy parts (CD74HC191MT, SN74HC191D, SN74HC191DT) for designs requiring extended production runs.