74HC221N,652 Equivalent & Substitute Parts

Part Overview

The 74HC221N,652 is a monostable multivibrator logic IC manufactured by NXP USA Inc. in a 16-DIP package. This device features dual independent circuits with Schmitt trigger inputs and a propagation delay of 19 ns, operating across a 2 V to 6 V supply range. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

74HC221N,652

NXP USA Inc.In Stock: 113974HC221N,652 Datasheet

Current PartRFQ

CD74HC221E

Texas InstrumentsIn Stock: 19796CD74HC221E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The CD74HC221E from Texas Instruments qualifies as a direct substitute based on the following critical parameters:

• Logic Function: Both devices implement identical monostable multivibrator architecture with 2 independent circuits
• Schmitt Trigger Input: Both feature Schmitt trigger inputs for noise immunity
• Output Current Specifications: Both deliver 5.2 mA output current (high and low)
• Supply Voltage Range: Both operate within 2 V to 6 V
• Package Compatibility: Both use 16-DIP (0.300", 7.62mm) through-hole packaging
• Series Compatibility: Both belong to the 74HC logic family with identical base product number (74HC221)
• Compliance: Both maintain ROHS3 compliance and REACH unaffected status

The CD74HC221E is currently in active production status, providing long-term availability compared to the obsolete 74HC221N,652.

Parameter Comparison

Engineering Selection Recommendations

The CD74HC221E is the appropriate substitute for the obsolete 74HC221N,652 in applications requiring monostable multivibrator functionality. Both devices maintain identical electrical specifications for supply voltage, output current, and logic operation. The CD74HC221E offers a marginally faster propagation delay (18 ns versus 19 ns), which is within acceptable tolerance for most timing-critical applications. The extended operating temperature range of the CD74HC221E (-55°C to 125°C versus -40°C to 125°C) provides additional thermal margin for demanding environments. Both parts maintain full ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The active production status of the CD74HC221E ensures long-term availability and supply chain stability compared to the obsolete NXP part.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC221E directly replace the 74HC221N,652 without circuit modifications?

A: Yes. Both devices share identical package geometry (16-DIP), pinout, supply voltage range (2 V ~ 6 V), output current specifications (5.2 mA), and logic function. No circuit modifications are required for direct substitution.

Q: What is the significance of the propagation delay difference (19 ns vs. 18 ns)?

A: The CD74HC221E has a 1 ns faster propagation delay. This represents a 5% improvement and is functionally equivalent for standard monostable multivibrator applications. Timing-sensitive circuits should verify that the faster response does not introduce unintended behavior.

Q: Are there package compatibility concerns between the two parts?

A: No. Both parts use identical 16-DIP (0.300", 7.62mm) through-hole packaging. PCB layouts, socket compatibility, and mechanical mounting are fully interchangeable.

Q: Why is the operating temperature range different?

A: The CD74HC221E supports -55°C to 125°C, while the 74HC221N,652 supports -40°C to 125°C. The Texas Instruments part provides extended low-temperature operation. For applications within the -40°C to 125°C range, both parts are equivalent.

Q: What compliance certifications apply to both parts?

A: Both the 74HC221N,652 and CD74HC221E are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: Is the CD74HC221E suitable for new designs?

A: Yes. The CD74HC221E is in active production status, making it the appropriate choice for new designs requiring monostable multivibrator functionality in the 74HC logic family.