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74LCX541MSA Equivalent & Substitute Parts
Part Overview
The 74LCX541MSA is a non-inverting buffer logic IC manufactured by onsemi, designed for 3-state output applications in 20-SSOP surface mount packaging. This device operates across a 2V to 3.6V supply voltage range with 24mA output current capability. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Logic Type | Buffer, Non-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 (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 20-SSOP (0.209", 5.30mm Width) |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the 74LCX541MSA is determined by the following critical parameters:
Functional Equivalence: All substitute parts maintain identical logic function (non-inverting buffer, 1 element, 8 bits per element, 3-state output) with matching 24mA output current specifications.
Supply Voltage Compatibility: The 74LCX541MSA operates at 2V to 3.6V. Substitute parts from the 74LVC series operate at 1.2V to 3.6V or 1.65V to 3.6V, providing backward compatibility within the original voltage range.
Package Compatibility: Substitutes are grouped by package type—20-SSOP (0.209", 5.30mm width) for direct pin-compatible replacement, and 20-TSSOP (0.173", 4.40mm width) for space-constrained applications. The 20-TVSOP variant (SN74LVC541ADGVR) offers an alternative footprint with identical electrical performance.
Operating Temperature Range: The original part specifies -40°C to 85°C. All active substitute parts extend this to -40°C to 125°C, providing enhanced thermal performance.
Product Status and Compliance: Active substitute parts from Texas Instruments and Nexperia include RoHS3 compliance and AEC-Q100 automotive qualification (SN74LVC541AQPWRQ1), addressing modern regulatory requirements absent from the obsolete original part.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Output Type | Current (mA) | Voltage Supply (V) | Temp Range (°C) | Package | Product Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|
| 74LCX541MSA | onsemi | Buffer, Non-Inverting | 3-State | 24, 24 | 2.0 ~ 3.6 | -40 ~ 85 | 20-SSOP | Obsolete | N/A |
| 74LVC541APW | Nexperia USA Inc. | Buffer, Non-Inverting | 3-State | 24, 24 | 1.2 ~ 3.6 | -40 ~ 125 | 20-TSSOP | Active | ROHS3 |
| SN74LVC541ADB | Texas Instruments | Buffer, Non-Inverting | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-SSOP | Active | ROHS3 |
| SN74LVC541ADBR | Texas Instruments | Buffer, Non-Inverting | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-SSOP | Active | ROHS3 |
| SN74LVC541ADGVR | Texas Instruments | Buffer, Non-Inverting | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-TVSOP | Active | ROHS3 |
| SN74LVC541APW | Texas Instruments | Buffer, Non-Inverting | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-TSSOP | Active | ROHS3 |
| SN74LVC541APWR | Texas Instruments | Buffer, Non-Inverting | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-TSSOP | Active | ROHS3 |
| SN74LVC541APWRG4 | Texas Instruments | Buffer, Non-Inverting | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-TSSOP | Discontinued at DiGi Electronics | ROHS3 |
| SN74LVC541APWT | Texas Instruments | Buffer, Non-Inverting | 3-State | 24, 24 | 1.65 ~ 3.6 | -40 ~ 125 | 20-TSSOP | Active | ROHS3 |
| SN74LVC541AQPWREP | Texas Instruments | Buffer, Non-Inverting | 3-State | 24, 24 | 2.0 ~ 3.6 | -40 ~ 125 | 20-TSSOP | Active | ROHS3 |
| SN74LVC541AQPWRQ1 | Texas Instruments | Buffer, Non-Inverting | 3-State | 24, 24 | 2.0 ~ 3.6 | -40 ~ 125 | 20-TSSOP | Active | ROHS3 |
Engineering Selection Recommendations
Direct Pin-Compatible Replacement (20-SSOP Package): SN74LVC541ADB and SN74LVC541ADBR are direct substitutes for the 74LCX541MSA in 20-SSOP packaging. Both are active products from Texas Instruments with RoHS3 compliance. SN74LVC541ADBR includes Cut Tape and Digi-Reel packaging options for production environments.
Space-Optimized Alternatives (20-TSSOP Package): For designs where PCB space is a constraint, the 20-TSSOP variants (SN74LVC541APW, SN74LVC541APWR, SN74LVC541APWT from Texas Instruments, and 74LVC541APW from Nexperia) provide identical electrical performance in a narrower 0.173" footprint. These require PCB layout modification but maintain full functional compatibility.
Automotive-Grade Option: SN74LVC541AQPWRQ1 is qualified to AEC-Q100 automotive standards with active product status, suitable for automotive and mission-critical applications requiring enhanced reliability certification.
Voltage Range Consideration: SN74LVC541AQPWREP and SN74LVC541AQPWRQ1 maintain the original 2V to 3.6V supply voltage range, while other 74LVC variants support 1.65V to 3.6V. For designs operating below 1.65V, only the AQPWR variants are suitable.
Avoid Discontinued Parts: SN74LVC541APWRG4 is discontinued at DiGi Electronics and should not be selected for new designs despite active inventory.
Frequently Asked Questions (FAQ)
Q: Can I use SN74LVC541ADB as a direct replacement for 74LCX541MSA?
A: Yes. Both parts are non-inverting buffers with 1 element, 8 bits per element, 3-state output, and 24mA output current. SN74LVC541ADB is in 20-SSOP packaging matching the original footprint. The supply voltage range of 1.65V to 3.6V encompasses the original 2V to 3.6V specification. Operating temperature extends from -40°C to 125°C, exceeding the original -40°C to 85°C range.
Q: What is the difference between 20-SSOP and 20-TSSOP packages?
A: Both are 20-pin surface mount packages. The 20-SSOP (Shrink Small Outline Package) has a 0.209" width, while 20-TSSOP (Thin Shrink Small Outline Package) has a 0.173" width. The TSSOP variant is narrower, reducing PCB footprint. Pin pitch and electrical performance are identical; only the physical dimensions differ.
Q: Why does SN74LVC541AQPWRQ1 cost more than other substitutes?
A: SN74LVC541AQPWRQ1 includes AEC-Q100 automotive qualification, indicating compliance with automotive reliability and testing standards. This certification is required for automotive applications and justifies the premium pricing.
Q: Is the 74LVC541 series backward compatible with the 74LCX541?
A: Functionally yes, within the overlapping voltage range. The 74LVC series operates at 1.2V to 3.6V (or 1.65V to 3.6V depending on variant), which includes the original 74LCX541MSA range of 2V to 3.6V. All electrical specifications for output current, logic function, and pin configuration are identical.
Q: Can I mix packaging types in the same design?
A: No. Different package types (20-SSOP vs. 20-TSSOP vs. 20-TVSOP) have different physical footprints and require separate PCB layouts. Select one package type for your design and maintain consistency across production.
Q: Which substitute has the highest inventory availability?
A: SN74LVC541APWR has 32,300 pieces in stock, followed by 74LVC541APW (Nexperia) with 32,705 pieces. Both are active products suitable for high-volume procurement.
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