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74LCX540MSA Equivalent & Substitute Parts
Part Overview
The 74LCX540MSA is an inverting buffer logic IC manufactured by onsemi, designed for 3-state output applications in 20-SSOP packaging. This component operates across a 2V to 3.6V supply voltage range with 24mA output current capability. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Manufacturer Part Number | 74LCX540MSA |
| Manufacturer | onsemi |
| Logic Type | Buffer, Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 24mA, 24mA |
| Voltage - Supply | 2V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 20-SSOP (0.209", 5.30mm Width) |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the 74LCX540MSA is determined by the following critical parameters:
- Logic Function: Buffer, Inverting with 1 Element, 8 Bits per Element, 3-State Output
- Electrical Compatibility: Output current of 24mA (high and low), supply voltage range encompassing 2V to 3.6V minimum
- Thermal Range: Operating temperature support from -40°C minimum
- Package Compatibility: 20-pin surface mount packages (SSOP, TSSOP, TVSOP variants acceptable)
- Functional Equivalence: Base product number 74LVC540 series from Texas Instruments provides direct functional replacement
All listed substitutes maintain the core 74LVC540 architecture with enhanced specifications. Texas Instruments 74LVC series parts offer extended temperature ranges (-40°C to 125°C) and broader supply voltage support (1.65V to 3.6V), providing superior performance margins over the obsolete onsemi part.
Parameter Comparison
| Parameter | 74LCX540MSA | SN74LVC540ADB | SN74LVC540ADBR | SN74LVC540ADGVR | SN74LVC540APW | SN74LVC540APWR | SN74LVC540APWT | SN74LVC540AQPWREP | SN74LVC540AQPWRQ1 |
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Logic Type | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting | Buffer, Inverting |
| Number of Elements | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Number of Bits per Element | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Output Type | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State | 3-State |
| Current - Output High, Low | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA |
| Voltage - Supply | 2V ~ 3.6V | 1.65V ~ 3.6V | 1.65V ~ 3.6V | 1.65V ~ 3.6V | 1.65V ~ 3.6V | 1.65V ~ 3.6V | 1.65V ~ 3.6V | 2V ~ 3.6V | 2V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 20-SSOP (0.209", 5.30mm) | 20-SSOP (0.209", 5.30mm) | 20-SSOP (0.209", 5.30mm) | 20-TFSOP (0.173", 4.40mm) | 20-TSSOP (0.173", 4.40mm) | 20-TSSOP (0.173", 4.40mm) | 20-TSSOP (0.173", 4.40mm) | 20-TSSOP (0.173", 4.40mm) | 20-TSSOP (0.173", 4.40mm) |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Substitutes (20-SSOP Package - Direct Footprint Match)
SN74LVC540ADB and SN74LVC540ADBR are the preferred direct replacements for the 74LCX540MSA. Both maintain the original 20-SSOP package footprint (0.209", 5.30mm width), eliminating PCB redesign requirements. These parts are active products with ROHS3 compliance and extended operating temperature range to 125°C, providing superior reliability margins.
Alternative Substitutes (20-TSSOP/20-TVSOP Packages - Smaller Footprint)
SN74LVC540ADGVR, SN74LVC540APW, SN74LVC540APWR, SN74LVC540APWT, SN74LVC540AQPWREP, and SN74LVC540AQPWRQ1 offer reduced package dimensions (0.173", 4.40mm width) in TSSOP or TVSOP variants. These substitutes require PCB layout modification but deliver space optimization benefits. SN74LVC540AQPWRQ1 includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.
Compliance Considerations
All Texas Instruments substitutes are ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements. The obsolete onsemi 74LCX540MSA lacks documented RoHS compliance, making transition to active substitutes necessary for new designs and long-term supply chain sustainability.
Frequently Asked Questions (FAQ)
Q: Can SN74LVC540ADB directly replace 74LCX540MSA without PCB modification?
A: Yes. SN74LVC540ADB maintains identical 20-SSOP package dimensions and pin configuration. No PCB layout changes are required. The part is functionally equivalent with enhanced electrical specifications.
Q: What is the key difference between 20-SSOP and 20-TSSOP packages?
A: Package width differs: 20-SSOP measures 0.209" (5.30mm) while 20-TSSOP measures 0.173" (4.40mm). TSSOP variants require PCB footprint redesign but occupy less board space. Pin pitch and electrical function remain identical.
Q: Are all substitute parts compatible with the original 2V to 3.6V supply range?
A: Most substitutes support 1.65V to 3.6V, exceeding the original specification. SN74LVC540AQPWREP and SN74LVC540AQPWRQ1 maintain the original 2V to 3.6V range. All substitutes operate safely within the 2V to 3.6V window.
Q: What is the temperature operating range improvement?
A: The 74LCX540MSA operates -40°C to 85°C. All Texas Instruments substitutes extend to -40°C to 125°C, providing 40°C additional high-temperature margin for demanding applications.
Q: Which substitute should be selected for automotive applications?
A: SN74LVC540AQPWRQ1 is qualified to AEC-Q100 automotive standards. This part is mandatory for automotive-grade designs requiring formal qualification documentation.
Q: Are packaging options available in tape and reel format?
A: Yes. SN74LVC540ADBR, SN74LVC540ADGVR, SN74LVC540APWT, SN74LVC540AQPWREP, and SN74LVC540AQPWRQ1 are supplied in tape and reel format. SN74LVC540APW is supplied in tube packaging. SN74LVC540ADB is available in prototype quantities.
Q: Do all substitutes maintain 24mA output current specification?
A: Yes. All listed substitutes provide 24mA output current for both high and low states, matching the original 74LCX540MSA electrical performance.
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