CD74HC221PW Equivalent & Substitute Parts

Part Overview

The CD74HC221PW is a monostable multivibrator logic integrated circuit manufactured by Texas Instruments. This device features dual independent circuits with Schmitt trigger inputs, designed for timing and pulse generation applications. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts essential for ongoing production and maintenance applications. The CD74HC221PW operates across a wide supply voltage range of 2V to 6V with a propagation delay of 18 nanoseconds, suitable for general-purpose logic timing circuits.

Substiute Parts

CD74HC221PW

Texas InstrumentsIn Stock: 1648CD74HC221PW Datasheet

Current PartRFQ

CD74HC221PWR

Texas InstrumentsIn Stock: 5176CD74HC221PWR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HC221PW is determined by strict equivalence across the following critical parameters:

• Logic Type: Monostable Multivibrator with dual independent circuits
• Propagation Delay: 18 ns
• Supply Voltage Range: 2 V ~ 6 V
• Output Current Capability: 5.2mA (High and Low)
• Package Type: 16-TSSOP surface mount
• Schmitt Trigger Input: Present
• Operating Temperature Range: -55°C ~ 125°C
• Base Product Number: 74HC221

The CD74HC221PWR qualifies as a direct substitute based on identical electrical specifications, package configuration, and functional characteristics. The primary distinction is packaging format and product availability status.

Parameter Comparison

Engineering Selection Recommendations

The CD74HC221PWR is the direct equivalent substitute for the CD74HC221PW. Both parts share identical electrical specifications, functional characteristics, and package dimensions. The CD74HC221PWR maintains active product status with higher inventory availability (5160 Pcs vs. 1555 Pcs), making it the preferred selection for new designs and production continuity.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications. The difference in packaging format (Tube vs. Cut Tape & Digi-Reel®) does not affect electrical performance or PCB assembly compatibility, as both utilize the same 16-TSSOP surface mount package.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC221PWR be used as a direct replacement for the CD74HC221PW?

A: Yes. Both parts are electrically and functionally identical. They share the same propagation delay (18 ns), supply voltage range (2V to 6V), output current specifications (5.2mA), and 16-TSSOP package configuration. The only difference is packaging format and product availability status.

Q: What is the significance of the packaging format difference (Tube vs. Cut Tape)?

A: Packaging format affects order quantity, storage, and assembly line handling but does not impact electrical performance or PCB compatibility. Tube packaging is typically used for smaller quantities, while Cut Tape and Digi-Reel® formats are standard for high-volume production environments.

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

A: No. Both the CD74HC221PW and CD74HC221PWR maintain identical RoHS3 compliance, REACH unaffected status, and Moisture Sensitivity Level (MSL) ratings. They are equivalent for regulatory and environmental compliance purposes.

Q: Why is the CD74HC221PW discontinued while the CD74HC221PWR remains active?

A: Product discontinuation at specific distributors does not indicate functional obsolescence. The CD74HC221PWR remains in active production by Texas Instruments and is available through alternative supply channels, making it the practical choice for ongoing applications.

Q: What parameters must remain constant for substitution compatibility?

A: The following parameters must match exactly: logic type (monostable multivibrator), number of independent circuits (2), propagation delay (18 ns), supply voltage range (2V to 6V), output current (5.2mA), operating temperature range (-55°C to 125°C), and package type (16-TSSOP surface mount).