CD74AC240MG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The CD74AC240MG4 is an octal inverting buffer and line driver from Texas Instruments featuring three-state outputs, active-low output enable control, and AC-logic speed. It operates over a 2 V to 6 V supply range, drives 50 pF loads at up to 100 MHz, and is housed in a 20-pin SOIC package for standard SMT assembly.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- CD74AC240MG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74AC240MG4?
- 8-channel inverting three-state buffer with active-low output enable for bus isolation
- AC-family CMOS logic with propagation delay under 8 ns at 5 V, VCC 2 V to 6 V
- 24 mA output drive current for directly driving bus lines and backplane loads
- 50 pF load capability supporting high-capacitance bus environments
- 20-pin SOIC package with MG4 green/lead-free suffix for RoHS-compliant assembly
What is CD74AC240MG4 used for?
The CD74AC240MG4 is widely used as a data bus buffer and address-line driver in embedded processor systems, memory interfaces, and FPGA I/O expansion boards where signal isolation and directional control are needed. Its three-state outputs allow multiple drivers to share a common bus, making it suitable for backplane interconnects in industrial controllers and communications equipment. The inverting function also makes it useful as a level translator or signal conditioner between logic subsystems operating at 3.3 V or 5 V.
What are the specifications of CD74AC240MG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | OUTPUT ENABLE ACTIVE HIGH FOR ONE FUNCTION |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | AC |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.012A |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Prop. Delay@Nom-Sup | 10.1ns |
| Propagation Delay (tpd) | 82ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Where can I find the CD74AC240MG4 datasheet?
CD74AC240MG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74AC240MG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
At what supply voltage does the CD74AC240MG4 achieve its fastest propagation delay, and what is that delay value?
The CD74AC240MG4 achieves its fastest propagation delay of approximately 8 ns when powered from a 5 V supply. The AC-logic family is specified for operation from 2 V to 6 V, but timing performance degrades at lower supply voltages, so 5 V operation is preferred in high-speed bus applications.
How many output channels does the CD74AC240MG4 provide, and can they all be disabled simultaneously?
The CD74AC240MG4 provides 8 inverting output channels arranged in two groups of 4, each controlled by an active-low output enable pin. Both enable pins can be asserted simultaneously to place all 8 outputs into a high-impedance three-state condition, allowing safe bus sharing with other drivers.
Can the CD74AC240MG4 replace older ALS or LS family octal buffers in an existing board design?
Yes, for many designs. The CD74AC240MG4 is pin-compatible with 74ALS240 and 74LS240 octal inverting buffers in the 20-pin SOIC footprint. Its AC-family drive strength of 24 mA output current exceeds LS-family levels, so designers should verify load requirements, but it is a functional drop-in for most bus-buffering applications.
What is the RoHS and lead-free status of the CD74AC240MG4, and what does the MG4 suffix indicate?
The MG4 suffix on the CD74AC240MG4 designates a green, halogen-free, lead-free package compliant with RoHS requirements. The part carries a JESD-609 e4 code, confirming it is 100% lead-free and suitable for Pb-free solder reflow assembly processes at standard peak temperatures.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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