CD74HCT240MG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
CD74HCT240MG4 is an 8-channel inverting tri-state buffer and line driver from Texas Instruments in the HCT CMOS family, with two active-low output enables and 50pF load drive capability in a 20-pin SOIC package. It translates and buffers TTL-level logic signals for bus driving with 6mA sink current. Available from stock worldwide with competitive pricing.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HCT240MG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74HCT240MG4?
- 8-channel inverting 3-state outputs with two active-low enable pins support byte-wide bus multiplexing with independent nibble enable control
- HCT family TTL-compatible inputs accept 5V logic with CMOS-level output swing for seamless 5V TTL-to-CMOS bus interfacing
- 50 pF load drive capability and 6 mA sink current per channel handle capacitive bus lines in backplane designs at standard SOIC-20 footprint
What is CD74HCT240MG4 used for?
CD74HCT240MG4 is used as a bus driver and buffer in microprocessor data bus systems, industrial PLC I/O modules, and memory interface circuits where 8-bit address or data lines must be driven to multiple loads. Its two independent enable pins allow byte-wide or nibble-by-nibble bus control, making it standard in bus switching architectures for EPROM and SRAM address latching. The HCT family compatibility with 5V TTL logic makes it a reliable choice for legacy bus-based embedded systems operating at 4.5V to 5.5V supply.
What are the specifications of CD74HCT240MG4?
| YTEOL | 0 |
| Additional Feature | TWO ACTIVE-LOW OUTPUT ENABLES |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | HCT |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.006A |
| 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 |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 33ns |
| Propagation Delay (tpd) | 33ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| 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 |
| Country of Origin | Malaysia |
Where can I find the CD74HCT240MG4 datasheet?
CD74HCT240MG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HCT240MG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How do the two active-low output enables on CD74HCT240MG4 support nibble-level bus control in an 8-bit data path?
CD74HCT240MG4 has 2 independent active-low output enable pins, each controlling 4 of the 8 channels. This allows the upper and lower nibbles of an 8-bit bus to be independently gated on or off, enabling half-bus enable strategies in microprocessor backplane designs without additional logic gates or multiplexers.
What bus load capacitance can CD74HCT240MG4 drive, and how does this affect the maximum bus length in a backplane?
CD74HCT240MG4 is rated to drive a 50 pF load per output channel. On a typical PCB backplane with 5 pF per slot, this allows driving at least 8 to 10 card slots at bus frequencies up to 20 MHz with standard 100Ω termination, keeping signal propagation delay within 1 clock period for most 8-bit embedded processor designs.
Why is the HCT family of CD74HCT240MG4 preferred over CMOS HC family for interfacing with legacy 5V TTL microprocessors?
HCT inputs have TTL-compatible switching thresholds (V_IL max 0.8V, V_IH min 2.0V), allowing direct connection to 5V TTL outputs without level shifting. Standard HC CMOS inputs require V_IH of 3.5V at 5V supply, which TTL outputs cannot reliably provide, making CD74HCT240MG4 the correct choice for mixed TTL-CMOS 5V bus systems in industrial embedded controllers.
How does CD74HCT240MG4 in a 20-pin SOIC compare to the DIP-20 version for a high-density bus repeater board?
The SOIC-20 package of CD74HCT240MG4 occupies approximately 12.8 mm x 7.5 mm versus a DIP-20 at roughly 26 mm x 7 mm, saving about 50% in board length. For a backplane card with 4 to 8 bus buffers in line, using SOIC reduces the buffer row length from 100 mm to 50 mm, freeing space for decoupling capacitors and connector keepout areas.
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Why Buy from FindMyChip
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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