74HC243DB,112 Equivalent & Substitute Parts

Part Overview

The 74HC243DB,112 is a non-inverting transceiver logic integrated circuit manufactured by NXP USA Inc. in a 14-SSOP surface mount package. This component functions as a 1-element, 4-bit transceiver with 3-state output capability, operating across a 2V to 6V supply voltage range. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

74HC243DB,112

NXP USA Inc.In Stock: 107374HC243DB,112 Datasheet

Current PartRFQ

CD74HC243M

Harris CorporationIn Stock: 6214CD74HC243M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC243DB,112 is determined by the following critical parameters:

• Logic Function: Transceiver, Non-Inverting configuration with identical element and bit-per-element count (1 element, 4 bits per element)
• Output Architecture: 3-State output capability
• Electrical Specifications: Supply voltage range (2V ~ 6V) and output current ratings (7.8mA high and low)
• Thermal Performance: Operating temperature range compatibility
• Package Compatibility: Surface mount technology with pin-compatible or functionally equivalent packaging

The CD74HC243M qualifies as a substitute based on matching logic type, element configuration, output type, supply voltage, output current specifications, and surface mount technology. Package differences (14-SOIC vs. 14-SSOP) require PCB layout verification but do not affect electrical functionality.

Parameter Comparison

Engineering Selection Recommendations

CD74HC243M as Primary Substitute:

The CD74HC243M manufactured by Harris Corporation provides functional equivalence to the 74HC243DB,112 across all critical electrical parameters. Both components share identical logic architecture, output configuration, supply voltage range, and output current specifications. The CD74HC243M operates across an extended lower temperature range (-55°C vs. -40°C), providing additional thermal margin in cold-environment applications.

Compliance Considerations:

The primary distinction between these components is RoHS compliance status. The 74HC243DB,112 is ROHS3 compliant, while the CD74HC243M is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements mandating RoHS compliance, the 74HC243DB,112 remains the preferred selection. For applications without RoHS constraints, the CD74HC243M is electrically and functionally suitable.

Package Transition:

The CD74HC243M uses 14-SOIC packaging (3.90mm width) compared to the 14-SSOP packaging (5.30mm width) of the main part. Both are surface mount technologies with identical pin counts and electrical pin assignments. PCB layout modifications are required to accommodate the different package footprint dimensions.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC243M directly replace the 74HC243DB,112 without circuit modifications?

A: The CD74HC243M is electrically equivalent and functionally interchangeable. However, the different package footprint (14-SOIC vs. 14-SSOP) requires PCB layout changes. Pin assignments and electrical characteristics are identical, so no schematic modifications are necessary.

Q: What is the significance of the RoHS compliance difference?

A: The 74HC243DB,112 is ROHS3 compliant, meeting European Union restrictions on hazardous substances. The CD74HC243M is RoHS non-compliant. Selection depends on regulatory requirements applicable to your application and end market.

Q: Are there any thermal performance differences between these parts?

A: The CD74HC243M operates across a wider lower temperature range (-55°C to 125°C) compared to the 74HC243DB,112 (-40°C to 125°C). Both support the same upper temperature limit. The CD74HC243M provides additional margin for cold-environment applications.

Q: Do both parts have the same output current specifications?

A: Yes. Both the 74HC243DB,112 and CD74HC243M provide identical output current ratings of 7.8mA for both high and low states, ensuring equivalent drive capability in 3-state output configurations.

Q: What supply voltage range do these components support?

A: Both components operate across the identical 2V to 6V supply voltage range, providing compatibility across standard logic voltage levels including 3.3V and 5V systems.

Q: Are there inventory or availability differences between these parts?

A: Both components are classified as obsolete. Availability through authorized distributors should be verified for current procurement requirements.