CD74HC221M Equivalent & Substitute Parts

Part Overview

The CD74HC221M is a monostable multivibrator logic IC manufactured by Texas Instruments, featuring dual independent circuits with Schmitt trigger inputs and 18 ns propagation delay. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and procurement needs.

Substiute Parts

CD74HC221M

Texas InstrumentsIn Stock: 3380CD74HC221M Datasheet

Current PartRFQ

CD74HC221M96

Texas InstrumentsIn Stock: 19712CD74HC221M96 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HC221M is determined by strict equivalence across the following critical parameters:

• Logic type and circuit configuration (monostable multivibrator with 2 independent circuits)
• Schmitt trigger input functionality
• Propagation delay specification (18 ns)
• Output current ratings (5.2 mA high and low)
• Supply voltage range (2 V ~ 6 V)
• Operating temperature range (-55°C ~ 125°C)
• Package type and pinout (16-SOIC)
• Compliance certifications (ROHS3, REACH Unaffected)

The CD74HC221M96 meets all these criteria as a direct functional equivalent within the same 74HC series from Texas Instruments.

Parameter Comparison

Engineering Selection Recommendations

The CD74HC221M96 is the direct substitute for the CD74HC221M. Both components are manufactured by Texas Instruments within the 74HC logic series and share identical electrical and mechanical specifications. The primary distinction is product status: the CD74HC221M is discontinued at DiGi Electronics, while the CD74HC221M96 maintains active status with higher inventory availability (19,622 units in stock versus 3,300 units for the original part number).

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and procurement. The packaging format differs only in supplier delivery method (tube for CD74HC221M versus cut tape and Digi-Reel for CD74HC221M96), with no impact on component functionality or circuit performance.

Frequently Asked Questions (FAQ)

Q: Are CD74HC221M and CD74HC221M96 pin-compatible?

A: Yes. Both components use the 16-SOIC package with identical pinout and electrical characteristics. Direct substitution on PCBs designed for either part number is supported.

Q: What is the difference between the two part numbers?

A: The CD74HC221M96 is the active production variant of the CD74HC221M series. The suffix "96" indicates the Digi-Reel packaging format. Electrical performance and specifications are identical.

Q: Can I use CD74HC221M96 in designs originally specified for CD74HC221M?

A: Yes. The CD74HC221M96 is a direct functional equivalent with identical electrical parameters, operating ranges, and package dimensions. No circuit modifications are required.

Q: What packaging options are available?

A: CD74HC221M is supplied in tube packaging. CD74HC221M96 is available in cut tape and Digi-Reel formats. Both formats contain the same component with identical specifications.

Q: Are there any compliance or certification differences?

A: No. Both part numbers maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status. Regulatory requirements are satisfied by either variant.

Q: What is the current availability status?

A: CD74HC221M is discontinued at DiGi Electronics with limited remaining inventory (3,300 units). CD74HC221M96 is active with higher availability (19,622 units in stock).