74HC243D,112 Equivalent & Substitute Parts

Part Overview

The 74HC243D,112 is a non-inverting transceiver logic integrated circuit manufactured by NXP USA Inc. in a 14-SOIC surface mount package. This device functions as a 1-element, 4-bit per element transceiver with 3-state output capability, operating across a 2V to 6V supply voltage range. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

74HC243D,112

NXP USA Inc.In Stock: 76874HC243D,112 Datasheet

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CD74HC243M

Harris CorporationIn Stock: 6214CD74HC243M Datasheet

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CD74HC243M96

Texas InstrumentsIn Stock: 17928CD74HC243M96 Datasheet

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CD74HC243MT

Texas InstrumentsIn Stock: 1119CD74HC243MT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC243D,112 is determined by strict equivalence across the following critical parameters:

Logic type (Transceiver, Non-Inverting), number of elements (1), bits per element (4), output type (3-State), output current specifications (7.8mA high and low), supply voltage range (2V ~ 6V), and package form factor (14-SOIC, 0.154" width, 3.90mm).

All identified substitute parts maintain identical electrical characteristics and mechanical compatibility. Variations in operating temperature range, RoHS compliance status, and product lifecycle status are noted but do not affect functional interchangeability within the specified parameter set.

Parameter Comparison

Engineering Selection Recommendations

CD74HC243M96 (Texas Instruments) is the primary substitute for new designs and ongoing procurement. This part maintains active product status, ROHS3 compliance alignment with the original specification, and extended operating temperature range (-55°C to 125°C). Inventory availability is substantial at 17,900 units.

CD74HC243MT (Texas Instruments) provides functional equivalence with identical electrical and mechanical specifications, ROHS3 compliance, and extended temperature range. Product status is discontinued at DiGi Electronics; inventory is limited to 1,104 units.

CD74HC243M (Harris Corporation) maintains full electrical and mechanical compatibility but carries RoHS non-compliance status and obsolete product classification. This option is suitable only where RoHS exemptions apply. Inventory availability is 6,137 units.

Frequently Asked Questions (FAQ)

Q: Are all listed substitute parts pin-compatible with the 74HC243D,112?

A: Yes. All substitute parts use the 14-SOIC package form factor with identical 0.154" width and 3.90mm dimensions, ensuring direct pin-for-pin compatibility on existing PCB layouts.

Q: What is the functional difference between the main part and substitutes?

A: There is no functional difference. All parts are 1-element, 4-bit non-inverting transceivers with 3-state outputs, identical output current ratings (7.8mA), and matching 2V to 6V supply voltage specifications.

Q: Does operating temperature range affect substitution eligibility?

A: No. The substitute parts offer extended operating temperature ranges (-55°C to 125°C versus -40°C to 125°C for the original). This represents an improvement in environmental tolerance and does not restrict substitution.

Q: Why is RoHS compliance status different across substitutes?

A: RoHS compliance reflects manufacturing date and regulatory requirements at the time of production. CD74HC243M predates ROHS3 requirements, while CD74HC243M96 and CD74HC243MT meet current compliance standards. Selection depends on end-application regulatory requirements.

Q: Which substitute should be selected for new production?

A: CD74HC243M96 is recommended for new designs due to active product status, ROHS3 compliance, and superior inventory availability.

Q: Can substitutes be used interchangeably in existing assemblies?

A: Yes, provided the assembly PCB layout and electrical design accommodate the 14-SOIC package. No circuit modifications are required.