74HC221D,652 Equivalent & Substitute Parts

Part Overview

The 74HC221D,652 is a monostable multivibrator logic integrated circuit manufactured by NXP Semiconductors. This device features two independent circuits with Schmitt trigger inputs, designed for timing and pulse generation applications. With a propagation delay of 19 ns and supply voltage range of 2 V to 6 V, it operates across industrial temperature ranges from -40°C to 125°C. The part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement.

Substiute Parts

74HC221D,652

NXP SemiconductorsIn Stock: 94874HC221D,652 Datasheet

Current PartRFQ

CD74HC221M96

Texas InstrumentsIn Stock: 19712CD74HC221M96 Datasheet

MFR RecommendedRFQ

CD74HC221MT

Texas InstrumentsIn Stock: 1399CD74HC221MT Datasheet

MFR RecommendedRFQ

CD74HC221NSR

Texas InstrumentsIn Stock: 3512CD74HC221NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC221D,652 is based on the following critical parameters that must remain consistent across equivalent parts:

Core Functional Requirements:

• Logic type: Monostable multivibrator
• Independent circuits: 2
• Schmitt trigger input: Yes
• Supply voltage range: 2 V ~ 6 V
• Output current capability: 5.2 mA (high and low)

Physical and Environmental Compatibility:

• Mounting type: Surface mount
• Package family: 16-SOIC or 16-SO variants
• RoHS compliance: ROHS3 Compliant
• Moisture sensitivity: MSL 1 (Unlimited)

Performance Characteristics:

• Propagation delay: 18-19 ns (acceptable range for timing-critical applications)
• Operating temperature: Extended range preferred (-55°C to 125°C acceptable for -40°C to 125°C requirement)

The three substitute parts listed below meet all functional and compliance requirements while offering active product status from Texas Instruments.

Parameter Comparison

Engineering Selection Recommendations

All three Texas Instruments substitutes (CD74HC221M96, CD74HC221MT, CD74HC221NSR) are functionally equivalent to the 74HC221D,652 and maintain active product status. Selection among these alternatives depends on packaging and supply chain requirements:

CD74HC221M96: Recommended for standard surface mount assembly. Supplied in Cut Tape and Digi-Reel packaging with the highest inventory availability (19,622 pcs). Package dimensions match the original 16-SOIC (0.154", 3.90mm width).

CD74HC221MT: Suitable for applications requiring Cut Tape packaging. Inventory of 1,298 pcs available. Identical electrical specifications and package dimensions to CD74HC221M96.

CD74HC221NSR: Specified for Tape & Reel supply chain processes. Package width is 0.209" (5.30mm), which differs from the original 16-SOIC (0.154", 3.90mm). This variant requires PCB layout verification for footprint compatibility. Inventory of 3,500 pcs available.

All substitutes provide extended operating temperature range (-55°C to 125°C) compared to the original specification (-40°C to 125°C), offering improved environmental performance. All maintain ROHS3 compliance and MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can CD74HC221M96, CD74HC221MT, and CD74HC221NSR be used interchangeably with 74HC221D,652?

A: Yes, all three Texas Instruments parts are functionally equivalent. They share identical logic type, circuit count, Schmitt trigger input, output current, and supply voltage specifications. The primary difference is packaging format and physical dimensions. CD74HC221M96 and CD74HC221MT use the same 16-SOIC package footprint (0.154" width) as the original. CD74HC221NSR uses a wider 16-SO package (0.209" width) and requires footprint verification before implementation.

Q: What is the difference between CD74HC221M96, CD74HC221MT, and CD74HC221NSR?

A: These parts differ in packaging and supply format only. CD74HC221M96 is supplied in Cut Tape and Digi-Reel formats. CD74HC221MT is supplied in Cut Tape format. CD74HC221NSR is supplied in Tape & Reel format. All three have identical electrical performance and propagation delay (18 ns). Package width differs for CD74HC221NSR (0.209" vs. 0.154"), which may affect PCB compatibility.

Q: Is the 18 ns propagation delay of the substitutes compatible with designs specified for 19 ns?

A: Yes. The 18 ns propagation delay of the Texas Instruments substitutes is faster than the original 19 ns specification. This represents improved performance and does not introduce timing incompatibility in applications designed for 19 ns operation.

Q: Are all substitutes RoHS and REACH compliant?

A: Yes. All three Texas Instruments substitutes are ROHS3 compliant and REACH unaffected, matching the compliance status of the original 74HC221D,652.

Q: What is the moisture sensitivity level (MSL) of the substitute parts?

A: All substitutes maintain MSL 1 (Unlimited), identical to the original part. This indicates no moisture sensitivity restrictions for storage or handling.

Q: Which substitute should be selected for new designs?

A: CD74HC221M96 is recommended for new designs due to highest inventory availability, standard Cut Tape and Digi-Reel packaging options, and package footprint compatibility with the original 16-SOIC (0.154", 3.90mm width) specification.