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74LVC240ADB,118 Equivalent & Substitute Parts
Part Overview
The 74LVC240ADB,118 is a logic buffer IC with inverting functionality, manufactured by Nexperia USA Inc. This component features 2 elements with 4 bits per element and 3-state output capability, designed for low-voltage CMOS applications. The part is currently obsolete, making equivalent substitutes necessary for ongoing design requirements and production needs. Substitute parts maintain functional equivalence while offering active product status and improved availability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Logic Type | Buffer, Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 4 |
| Output Type | 3-State |
| Current - Output High, Low | 24mA, 24mA |
| Voltage - Supply | 1.2V ~ 3.6V |
| Operating Temperature | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount |
| Series | 74LVC |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 74LVC240ADB,118 is determined by the following critical parameters:
Functional Parameters: Logic type (Buffer, Inverting), number of elements (2), bits per element (4), and output type (3-State) must remain constant across all substitutes.
Electrical Parameters: Output current capability (24mA, 24mA), supply voltage range, and operating temperature range define the electrical compatibility envelope.
Package Compatibility: Substitutes are grouped by package type. The original 20-SSOP package can be directly replaced by identical package variants. Cross-package substitution (SSOP to TSSOP, SOIC, or TVSOP) requires PCB layout verification due to different pin pitch and body dimensions.
Series Compatibility: Primary substitutes maintain the 74LVC series designation. The 74LCX240MTCX variant operates within a narrower voltage range (2V ~ 3.6V) and reduced temperature range (-40°C ~ 85°C), requiring application-level validation.
Product Status: Active status substitutes are preferred over discontinued variants for long-term supply chain reliability.
Parameter Comparison
| Part Number | Manufacturer | Package | Supply Voltage | Operating Temp | Product Status | Output Current (High/Low) |
|---|---|---|---|---|---|---|
| 74LVC240ADB,118 | Nexperia USA Inc. | 20-SSOP | 1.2V ~ 3.6V | -40°C ~ 125°C | Obsolete | 24mA, 24mA |
| 74LVC240APW,118 | NXP Semiconductors | 20-TSSOP | 1.2V ~ 3.6V | -40°C ~ 125°C | Active | 24mA, 24mA |
| SN74LVC240ADWR | Texas Instruments | 20-SOIC | 1.65V ~ 3.6V | -40°C ~ 125°C | Active | 24mA, 24mA |
| 74LCX240MTCX | Fairchild Semiconductor | 20-TSSOP | 2V ~ 3.6V | -40°C ~ 85°C | Active | 24mA, 24mA |
| SN74LVC240ADBR | Texas Instruments | 20-SSOP | 1.65V ~ 3.6V | -40°C ~ 125°C | Active | 24mA, 24mA |
| SN74LVC240ADGVR | Texas Instruments | 20-TVSOP | 1.65V ~ 3.6V | -40°C ~ 125°C | Active | 24mA, 24mA |
| SN74LVC240APW | Texas Instruments | 20-TSSOP | 1.65V ~ 3.6V | -40°C ~ 125°C | Active | 24mA, 24mA |
| SN74LVC240APWR | Texas Instruments | 20-TSSOP | 1.65V ~ 3.6V | -40°C ~ 125°C | Active | 24mA, 24mA |
| SN74LVC240APWRG4 | Texas Instruments | 20-TSSOP | 1.65V ~ 3.6V | -40°C ~ 125°C | Discontinued at DiGi Electronics | 24mA, 24mA |
| SN74LVC240APWT | Texas Instruments | 20-TSSOP | 1.65V ~ 3.6V | -40°C ~ 125°C | Active | 24mA, 24mA |
| SN74LVCZ240APW | Texas Instruments | 20-TSSOP | 2.7V ~ 3.6V | -40°C ~ 85°C | Active | 24mA, 24mA |
Engineering Selection Recommendations
Direct Package Replacement (20-SSOP): SN74LVC240ADBR is the primary substitute for the 74LVC240ADB,118. Both parts use the 20-SSOP package, enabling direct PCB substitution without layout modifications. The part is manufactured by Texas Instruments, carries ROHS3 compliance, and maintains active product status with 2814 units in stock.
Alternative Package Options: For applications where package flexibility exists, SN74LVC240APW, SN74LVC240APWR, and SN74LVC240APWT offer 20-TSSOP packaging with improved availability (2200, 7442, and 1685 units respectively). These parts maintain full electrical compatibility and active status. SN74LVC240ADGVR provides 20-TVSOP packaging as an additional alternative.
Cross-Manufacturer Substitution: 74LVC240APW,118 from NXP Semiconductors offers 20-TSSOP packaging with 42885 units in stock, representing the highest inventory availability among substitutes.
Voltage Range Considerations: SN74LVC240ADWR (Texas Instruments, 20-SOIC) and all SN74LVC240 variants from Texas Instruments specify a minimum supply voltage of 1.65V, compared to the original part's 1.2V minimum. Applications requiring operation below 1.65V must use 74LVC240APW,118 (NXP) or verify compatibility with the original specification.
Temperature Range Limitations: 74LCX240MTCX and SN74LVCZ240APW operate within a reduced temperature range (-40°C ~ 85°C) compared to the original specification (-40°C ~ 125°C). These parts are suitable only for applications not requiring the full 125°C upper temperature limit.
Discontinued Status: SN74LVC240APWRG4 is discontinued at DiGi Electronics and should be avoided for new designs despite active inventory availability.
Frequently Asked Questions (FAQ)
Q: Can I use SN74LVC240ADBR as a direct replacement for 74LVC240ADB,118?
A: Yes. Both parts use the 20-SSOP package with identical pin configuration, electrical specifications (24mA output current, 3-state output), and functional characteristics (2 elements, 4 bits per element, inverting buffer). No PCB modifications are required.
Q: What is the difference between 20-SSOP and 20-TSSOP packages?
A: 20-SSOP has a body width of 5.30mm with 0.209" pitch, while 20-TSSOP has a body width of 4.40mm with 0.173" pitch. These are not pin-compatible and require different PCB footprints. Cross-package substitution demands PCB layout redesign.
Q: Why does SN74LVC240ADWR specify 1.65V minimum supply voltage instead of 1.2V?
A: This reflects Texas Instruments' specification for the SN74LVC240 series. Applications operating at 1.2V ~ 1.65V must use 74LVC240APW,118 (NXP) or the original Nexperia part to ensure compliance with the lower voltage requirement.
Q: Is 74LCX240MTCX a suitable substitute?
A: 74LCX240MTCX maintains functional equivalence and electrical output characteristics but operates within a narrower voltage range (2V ~ 3.6V) and reduced temperature range (-40°C ~ 85°C). It is suitable only for applications that do not require operation below 2V or above 85°C.
Q: What does "Discontinued at DiGi Electronics" mean for SN74LVC240APWRG4?
A: This indicates the part is no longer actively distributed through DiGi Electronics, though inventory may remain available. For new designs, select from active status alternatives such as SN74LVC240APWR or SN74LVC240APWT.
Q: Which substitute offers the best inventory availability?
A: 74LVC240APW,118 from NXP Semiconductors has the highest inventory with 42885 units in stock, followed by 74LCX240MTCX with 23800 units.
Q: Are all substitutes RoHS3 compliant?
A: All listed substitutes carry RoHS3 compliance certification. Moisture sensitivity level is uniformly rated at MSL 1 (Unlimited) across all parts.
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