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74AC240MTC Equivalent & Substitute Parts
Part Overview
The 74AC240MTC is a Buffer, Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates across a 2V to 6V supply voltage range with 24mA output current capacity in both high and low states. The 74AC240MTC is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| 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 | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| Base Product Number | 74AC240 |
Substitute Part Grouping Explanation
Substitute parts for the 74AC240MTC are classified based on electrical parameter equivalence and package compatibility. All listed substitutes maintain identical logic functionality, element count, bit configuration, output type, and current specifications. The primary substitution criteria are:
- Logic Type: Buffer, Inverting (2 elements, 4 bits per element, 3-state output)
- Electrical Parameters: 24mA output current, 2V ~ 6V supply voltage
- Package Compatibility: 20-TSSOP or 20-SSOP surface mount packages
- Operating Temperature Range: Minimum -40°C to 85°C (automotive-grade variants extend to 125°C)
- Manufacturer: onsemi or Texas Instruments
Parameter Comparison
| Part Number | Manufacturer | Product Status | Package / Case | Operating Temperature | Packaging Type | RoHS Status | Inventory |
|---|---|---|---|---|---|---|---|
| 74AC240MTC | onsemi | Obsolete | 20-TSSOP | -40°C ~ 85°C | - | - | 3225 Pcs |
| MC74AC240DTR2G | onsemi | Active | 20-TSSOP | -40°C ~ 85°C | Tape & Reel (TR) | ROHS3 Compliant | 1592 Pcs |
| SN74AC240PWR | Texas Instruments | Active | 20-TSSOP | -40°C ~ 85°C | Tape & Reel (TR) | ROHS3 Compliant | 3300 Pcs |
| SN74AC240QPWRG4Q1 | Texas Instruments | Obsolete | 20-TSSOP | -40°C ~ 125°C | Cut Tape (CT) & Digi-Reel® | ROHS3 Compliant | 1212 Pcs |
| SN74AC240DBR | Texas Instruments | Active | 20-SSOP | -40°C ~ 85°C | Tape & Reel (TR) | ROHS3 Compliant | 3100 Pcs |
| SN74AC240QPWRQ1 | Texas Instruments | Active | 20-TSSOP | -40°C ~ 125°C | Tape & Reel (TR) | ROHS3 Compliant | 2100 Pcs |
| SN74AC240PW | Texas Instruments | Discontinued at DiGi Electronics | 20-TSSOP | -40°C ~ 85°C | Tube | ROHS3 Compliant | 1533 Pcs |
Engineering Selection Recommendations
For direct replacement of the obsolete 74AC240MTC, the following selection criteria apply:
Primary Recommendation: MC74AC240DTR2G (onsemi) or SN74AC240PWR (Texas Instruments) are preferred substitutes. Both maintain identical electrical specifications, operate within the standard -40°C to 85°C temperature range, and are currently in active production status with ROHS3 compliance.
Package Consideration: SN74AC240DBR uses a 20-SSOP package instead of 20-TSSOP. While electrically equivalent, this package variant has different physical dimensions (0.209" vs 0.173" width) and requires PCB layout verification before implementation.
Extended Temperature Applications: SN74AC240QPWRQ1 and SN74AC240QPWRG4Q1 extend the operating temperature range to -40°C to 125°C and include AEC-Q100 automotive qualification. These variants are suitable for automotive or high-temperature environments where the standard temperature range is insufficient.
Availability: SN74AC240PWR offers the highest inventory availability (3300 Pcs) among active parts, followed by SN74AC240DBR (3100 Pcs) and SN74AC240QPWRQ1 (2100 Pcs).
Frequently Asked Questions (FAQ)
Q: Can SN74AC240DBR be used as a direct replacement for 74AC240MTC?
A: SN74AC240DBR is electrically equivalent but uses a 20-SSOP package instead of 20-TSSOP. The package footprint differs in width (0.209" vs 0.173"), requiring PCB layout modification. Electrical functionality and pin configuration remain compatible.
Q: What is the difference between standard and automotive-grade variants?
A: Automotive-grade parts (SN74AC240QPWRQ1, SN74AC240QPWRG4Q1) operate across -40°C to 125°C and carry AEC-Q100 qualification. Standard variants operate -40°C to 85°C. Select automotive-grade only if your application requires extended temperature operation or automotive certification.
Q: Are all substitutes ROHS3 compliant?
A: All active and recently discontinued substitutes listed are ROHS3 compliant. The original 74AC240MTC does not specify RoHS status in available documentation.
Q: Which substitute offers the best long-term availability?
A: MC74AC240DTR2G and SN74AC240PWR are both in active production status. SN74AC240PWR (Texas Instruments) currently shows higher inventory levels (3300 Pcs) and represents the most readily available option.
Q: Can I use SN74AC240PW as a substitute?
A: SN74AC240PW is electrically equivalent but is discontinued at DiGi Electronics. While limited inventory exists (1533 Pcs), active production alternatives are recommended for new designs to ensure long-term supply continuity.
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