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74LVC240ADB,112 Equivalent & Substitute Parts
Part Overview
The 74LVC240ADB,112 is a logic buffer IC manufactured by Nexperia USA Inc., featuring inverting 2-element, 4-bit per element architecture with 3-state output capability. This component operates across a 1.2V to 3.6V supply voltage range and is housed in a 20-SSOP package. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74LVC240ADB,112 |
| Manufacturer | Nexperia USA Inc. |
| 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 |
| Package / Case | 20-SSOP (0.209", 5.30mm Width) |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the 74LVC240ADB,112 is determined by strict equivalence across the following parameters:
- Logic type: Buffer, Inverting
- Number of elements: 2
- Number of bits per element: 4
- Output type: 3-State
- Output current capability: 24mA (high and low)
- Mounting type: Surface Mount
- RoHS and MSL compliance status
Substitute parts are grouped into two categories based on package compatibility:
Category 1: 20-SSOP Package (Direct Pin-Compatible) Parts maintaining the identical 20-SSOP (0.209", 5.30mm Width) package footprint as the original component.
Category 2: 20-TSSOP/20-TVSOP Packages (Functionally Equivalent, Different Footprint) Parts with identical electrical specifications but housed in alternative surface-mount packages (20-TSSOP or 20-TVSOP), requiring PCB layout modification.
Category 3: Alternative Series (Extended Voltage Range) Parts from the 74LVCZ series offering narrower supply voltage ranges (2.7V ~ 3.6V) and reduced operating temperature range (-40°C ~ 85°C).
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements / Bits | Output Type | Current (mA) | Voltage Supply | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| 74LVC240ADB,112 | Nexperia USA Inc. | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 1.2V ~ 3.6V | -40°C ~ 125°C | 20-SSOP | Obsolete |
| SN74LVC240ADBR | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 20-SSOP | Active |
| 74LCX240MTCX | Fairchild Semiconductor | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 2V ~ 3.6V | -40°C ~ 85°C | 20-TSSOP | Active |
| SN74LVC240ADGVR | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 20-TVSOP | Active |
| SN74LVC240APW | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 20-TSSOP | Active |
| SN74LVC240APWR | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 20-TSSOP | Active |
| SN74LVC240APWRG4 | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 20-TSSOP | Discontinued at DiGi Electronics |
| SN74LVC240APWT | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 20-TSSOP | Active |
| SN74LVCZ240APW | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 2.7V ~ 3.6V | -40°C ~ 85°C | 20-TSSOP | Active |
| SN74LVCZ240APWR | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 2.7V ~ 3.6V | -40°C ~ 85°C | 20-TSSOP | Active |
| SN74LVCZ240APWT | Texas Instruments | Buffer, Inverting | 2 / 4 | 3-State | 24 / 24 | 2.7V ~ 3.6V | -40°C ~ 85°C | 20-TSSOP | Discontinued at DiGi Electronics |
Engineering Selection Recommendations
For Direct Pin-Compatible Replacement (20-SSOP Package):
SN74LVC240ADBR (Texas Instruments) is the primary substitute for the obsolete 74LVC240ADB,112. This part maintains identical 20-SSOP package geometry, enabling direct PCB substitution without layout modification. The supply voltage range narrows from 1.2V–3.6V to 1.65V–3.6V, which remains compatible with standard 3.3V and 5V logic systems. Product status is active with full RoHS3 compliance and MSL 1 rating.
For Alternative Package Implementations:
SN74LVC240APW, SN74LVC240APWR, and SN74LVC240APWT (Texas Instruments) provide functionally equivalent performance in the 20-TSSOP package (0.173", 4.40mm Width). These parts require PCB redesign due to different footprint dimensions but offer the same electrical specifications and active product status. SN74LVC240ADGVR provides the same functionality in 20-TVSOP package format.
For Constrained Supply Voltage Applications:
SN74LVCZ240APW and SN74LVCZ240APWR operate within a narrower supply voltage range (2.7V–3.6V) and reduced temperature range (-40°C–85°C). These parts are suitable only for applications where the lower voltage floor and temperature limits are acceptable. Both maintain active product status.
Compliance Considerations:
All recommended substitutes maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original component's environmental specifications.
Frequently Asked Questions (FAQ)
Q: Can SN74LVC240ADBR be used as a direct replacement for 74LVC240ADB,112 without PCB modification?
A: Yes. SN74LVC240ADBR maintains identical 20-SSOP package dimensions and pin configuration. No PCB layout changes are required. The narrower supply voltage range (1.65V–3.6V versus 1.2V–3.6V) does not affect compatibility with standard logic supply voltages.
Q: What is the difference between 20-SSOP and 20-TSSOP packages?
A: Both are surface-mount packages with 20 pins. The 20-SSOP measures 0.209" (5.30mm) in width, while the 20-TSSOP measures 0.173" (4.40mm) in width. Different footprints require separate PCB designs; parts are not mechanically interchangeable on the same board.
Q: Are the 74LVCZ series parts (SN74LVCZ240APW, SN74LVCZ240APWR) suitable replacements?
A: The 74LVCZ series provides electrical equivalence but operates within a narrower supply voltage range (2.7V–3.6V) and reduced temperature range (-40°C–85°C). Use these parts only if your application operates within these constraints.
Q: What is the significance of the packaging suffix (APW, ADBR, APWR, APWT)?
A: Packaging suffixes indicate different delivery formats. APW denotes tube packaging, ADBR and APWR indicate tape and reel, and APWT indicates tape and reel with specific handling. Electrical specifications remain identical across all suffix variants within the same base part number.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the original component's environmental certifications.
Q: Which substitute offers the best availability?
A: 74LCX240MTCX (Fairchild Semiconductor) shows the highest inventory level at 23,800 pieces. However, this part operates within a 2V–3.6V supply range and -40°C–85°C temperature range, which may not suit all applications requiring the original's extended lower voltage specification.
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