74LCX841MSAX Equivalent & Substitute Parts

Part Overview

The 74LCX841MSAX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring a 10:10 circuit configuration with tri-state output capability. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part operates across a 2V to 3.6V supply voltage range and is packaged in a 24-SSOP surface mount configuration with a 1.5ns propagation delay.

Substiute Parts

74LCX841MSAX

onsemiIn Stock: 105374LCX841MSAX Datasheet

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SN74LVC841ADBR

Texas InstrumentsIn Stock: 764SN74LVC841ADBR Datasheet

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SN74LVC841APW

Texas InstrumentsIn Stock: 788SN74LVC841APW Datasheet

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SN74LVC841APWR

Texas InstrumentsIn Stock: 18236SN74LVC841APWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74LCX841MSAX is determined by strict equivalence across the following critical parameters:

Functional Equivalence Criteria:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 10:10
• Output Type: Tri-State
• Independent Circuits: 1
• Current - Output High, Low: 24mA, 24mA
• Operating Temperature Range: -40°C ~ 85°C
• Mounting Type: Surface Mount

Voltage Compatibility: The 74LCX841MSAX operates at 2V ~ 3.6V. Substitute parts from the 74LVC series operate at 1.65V ~ 3.6V, providing extended lower voltage capability while maintaining full compatibility within the original part's operating range.

Package Considerations: The original part uses 24-SSOP packaging. Substitute parts are available in both 24-SSOP and 24-TSSOP configurations. Both package types maintain identical pin counts and electrical characteristics, with dimensional differences limited to package width (5.30mm for SSOP versus 4.40mm for TSSOP).

Parameter Comparison

Engineering Selection Recommendations

For Direct Package Replacement (24-SSOP): SN74LVC841ADBR is the appropriate selection when PCB layout and package footprint constraints require the original 24-SSOP configuration. This part maintains identical package dimensions while offering active product status and ROHS3 compliance.

For Optimized Packaging (24-TSSOP): SN74LVC841APW and SN74LVC841APWR provide the same functional and electrical characteristics in the more compact 24-TSSOP package. SN74LVC841APWR, available in Tape & Reel packaging with significantly higher inventory (18,130 pcs), is recommended for production applications requiring volume availability and standard supply chain logistics.

Compliance Considerations: All three Texas Instruments substitutes are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The original 74LCX841MSAX does not specify RoHS compliance status, making the substitutes preferable for applications subject to environmental regulations.

Propagation Delay Trade-off: The substitute parts exhibit 2.7ns propagation delay compared to the original 1.5ns specification. This 1.2ns increase must be evaluated against system timing requirements. For applications with timing margins exceeding 1.2ns, this difference is not functionally significant.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC841APWR be used as a direct replacement for 74LCX841MSAX? A: Yes, functionally and electrically. The SN74LVC841APWR maintains identical logic type, circuit configuration, output type, current ratings, and operating temperature range. The primary differences are package type (24-TSSOP versus 24-SSOP), propagation delay (2.7ns versus 1.5ns), and product status (active versus obsolete). PCB layout compatibility depends on whether the 24-TSSOP footprint can be accommodated.

Q: What is the significance of the voltage range difference (2V ~ 3.6V versus 1.65V ~ 3.6V)? A: The Texas Instruments substitutes support extended lower voltage operation down to 1.65V. If the application operates exclusively within the 2V ~ 3.6V range, this difference has no practical impact. The substitutes remain fully compatible at all voltages within the original specification.

Q: Are there package compatibility issues between 24-SSOP and 24-TSSOP? A: Both packages maintain 24-pin configurations with identical electrical pin assignments. The primary difference is physical width: 24-SSOP measures 5.30mm while 24-TSSOP measures 4.40mm. PCB footprint compatibility requires verification against specific design layout constraints.

Q: How does the 1.2ns propagation delay increase affect system performance? A: The substitute parts introduce 1.2ns additional propagation delay (2.7ns versus 1.5ns). This affects signal timing in latching operations. Applications with timing margins greater than 1.2ns experience no functional impact. Critical timing paths require detailed analysis against system specifications.

Q: Why is SN74LVC841APWR recommended over SN74LVC841APW? A: Both parts are electrically identical. SN74LVC841APWR offers significantly higher inventory availability (18,130 pcs versus 771 pcs) and is supplied in standard Tape & Reel packaging, providing superior supply chain reliability and cost efficiency for production applications.

Q: What compliance advantages do the substitutes provide? A: All three Texas Instruments alternatives are ROHS3 compliant and REACH unaffected. The original 74LCX841MSAX does not specify RoHS compliance. For applications subject to environmental regulations or customer requirements, the substitutes provide documented compliance status.