74VHC221AMTC Equivalent & Substitute Parts

Part Overview

The 74VHC221AMTC is a monostable multivibrator logic IC manufactured by onsemi, featuring dual independent circuits with Schmitt trigger inputs and 8.1 ns propagation delay. The device is packaged in 16-TSSOP surface mount configuration and operates across a 2 V to 5.5 V supply range.

The 74VHC221AMTC is classified as obsolete. Equivalent and substitute parts are necessary for applications requiring continued component availability, alternative sourcing options, or design flexibility in new projects.

Substiute Parts

74VHC221AMTC

onsemiIn Stock: 82374VHC221AMTC Datasheet

Current PartRFQ

SN74LV221APW

Texas InstrumentsIn Stock: 1155SN74LV221APW Datasheet

DirectRFQ

SN74AHC123APWR

Texas InstrumentsIn Stock: 3441SN74AHC123APWR Datasheet

SimilarRFQ

SN74LV221APWR

Texas InstrumentsIn Stock: 3026SN74LV221APWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74VHC221AMTC are qualified based on the following criteria:

Functional Equivalence: All substitute parts are monostable multivibrators with dual independent circuits and Schmitt trigger inputs, matching the core logic function.

Package Compatibility: All substitutes use the 16-TSSOP surface mount package with identical 0.173" (4.40mm) width, ensuring mechanical and electrical compatibility on PCBs designed for the 74VHC221AMTC.

Electrical Parameters: Substitutes maintain the same supply voltage range (2 V ~ 5.5 V) and operating temperature range (-40°C ~ 85°C), ensuring functional operation in equivalent circuit environments.

Propagation Delay Tolerance: Substitute parts exhibit propagation delays within acceptable ranges for monostable multivibrator applications (7.5 ns to 13.2 ns), with performance variations documented for design consideration.

Output Current Capability: Substitute parts provide output current ratings of 8 mA to 12 mA, supporting equivalent load-driving capability.

Parameter Comparison

Engineering Selection Recommendations

SN74AHC123APWR (Texas Instruments): This part is the preferred substitute for new designs. It maintains active product status, offers ROHS3 compliance, and delivers the fastest propagation delay (7.5 ns) among available substitutes. Output current capability matches the original part at 8 mA per output. This device is suitable for applications requiring performance equivalent to or exceeding the 74VHC221AMTC.

SN74LV221APW (Texas Instruments): This direct substitute provides ROHS3 compliance and higher output current capability (12 mA per output). The 13.2 ns propagation delay is acceptable for applications where timing margins permit. This part is available in tube packaging and is suitable for replacement in existing designs where component availability is the primary concern.

SN74LV221APWR (Texas Instruments): This variant offers identical electrical specifications to the SN74LV221APW with tape and reel packaging. ROHS3 compliance and higher output current (12 mA) are provided. The obsolete product status indicates limited future availability; however, current inventory levels support near-term sourcing requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74AHC123APWR directly replace the 74VHC221AMTC without circuit modification?

A: Yes. The SN74AHC123APWR is functionally equivalent with identical package, pin configuration, supply voltage range, operating temperature range, and output current capability. The faster propagation delay (7.5 ns versus 8.1 ns) improves timing performance and does not require circuit changes.

Q: What is the difference between SN74LV221APW and SN74LV221APWR?

A: Both parts are electrically identical monostable multivibrators with 13.2 ns propagation delay and 12 mA output current. The primary difference is packaging: SN74LV221APW is supplied in tube format, while SN74LV221APWR is supplied in tape and reel format. Selection depends on procurement and assembly requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts (SN74AHC123APWR, SN74LV221APW, and SN74LV221APWR) are ROHS3 compliant. The original 74VHC221AMTC RoHS status is not specified in available documentation.

Q: How does propagation delay affect circuit performance?

A: Propagation delay determines the time interval between input trigger and output response. The 74VHC221AMTC specifies 8.1 ns. The SN74AHC123APWR (7.5 ns) provides faster response, while SN74LV221 variants (13.2 ns) introduce additional delay. For timing-critical applications, verify that the substitute part's propagation delay remains within system timing budgets.

Q: Can these parts be used interchangeably in high-volume production?

A: All substitute parts share identical 16-TSSOP package dimensions and pin assignments, enabling direct PCB compatibility. However, verify component availability and lead times with suppliers before committing to production quantities. The SN74AHC123APWR, with active product status, offers the most stable long-term availability.

Q: What is the significance of Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life without moisture-related degradation concerns. All parts in this comparison carry MSL 1 rating, eliminating moisture sensitivity as a selection factor.