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Texas Instruments CD74AC240M
- Part No.:
- CD74AC240M
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74AC240M.pdf
- Description:
- IC BUFF INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:526
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Product details
Overview
CD74AC240M from Texas Instruments is an octal 3-state inverting buffer/line driver in SOIC-20 package, operating from 1.5 V to 5.5 V, delivering ±24 mA output drive per pin, with balanced propagation delays (e.g., 6.5 ns max tPHL at 5 V), and designed for bus interface and data routing in industrial control systems.
For engineers reviewing the CD74AC240M datasheet, CD74AC240M pinout, CD74AC240M application, or CD74AC240M equivalent, key selection criteria include its dual active-low output enables (1OE, 2OE), 3-state output capability, 50-Ω transmission-line drive support, and −40°C to +85°C industrial temperature range.
Technical Context
The CD74AC240M implements two independent 4-bit inverting buffer banks, each controlled by a dedicated active-low output enable (1OE, 2OE). Its RCA Advanced CMOS process ensures SCR latch-up resistance and operation across 1.5–5.5 V supply.
It features balanced tPLH/tPHL propagation delays (≤9.2 ns at 3.3 V), low 3-state leakage (±5 μA max), and input noise immunity at 30% of VCC - enabling reliable signal integrity in mixed-voltage digital systems with fanout to 15 FAST ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.5 V to 5.5 V - supports wide-range logic interfacing including 3.3 V and 5 V systems |
| Output Drive | ±24 mA per output - drives 50 Ω transmission lines directly without external termination |
| Propagation Delay | 6.5 ns max tPHL at 5 V - enables high-speed bus buffering up to ~100 MHz clock domains |
| Input Threshold | VIL = 0.9 V, VIH = 2.1 V at 3 V - provides 30% noise margin relative to supply |
| Quiescent Current | 80 μA max ICC at +85°C - ultra-low static power for battery-adjacent or thermally constrained designs |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded applications |
| Package | SOIC-20 (DW) - surface-mount compatible with standard reflow profiles (Level-1) |
Pinout & Package
CD74AC240M uses a 20-pin SOIC (DW) package with 12.8 mm × 10.3 mm footprint and 12.8 mm × 7.5 mm body size. Pin functions are validated per TI SCHS287C Rev C (May 2024).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable inputs | Independent control of Bank 1 (pins 2–9) and Bank 2 (pins 11–18); both must be low for output assertion |
| 1A0–1A3, 2A0–2A3 | Input terminals | Eight buffered inverting inputs - logic inversion occurs on all eight channels |
| 1Y0–1Y3, 2Y0–2Y3 | Inverting output terminals | Corresponding inverted outputs; high-impedance when respective OE is high |
| GND (Pin 10), VCC (Pin 20) | Power terminals | Single-supply operation; requires local 0.1 µF bypass capacitor at VCC |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latch-up-resistant CMOS | Guarantees robust operation in noisy industrial environments without destructive latch-up events |
| Balanced propagation delays | Minimizes skew between channels (<0.5 ns typical mismatch), critical for parallel bus timing integrity |
| 1.5 V to 5.5 V operation | Enables direct interfacing between 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level shifters |
| ±24 mA output drive | Sustains full logic swing into 50 Ω loads - eliminates need for external line drivers in backplane or PCB trace routing |
| 3-state output control | Allows bidirectional bus sharing and hot-swappable module insertion in multi-drop systems |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Isolating and buffering sensor input signals and actuator command lines in programmable logic controller racks. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing galvanically isolated signal conditioning and bus contention management. Use Value: Enables clean signal routing across multiple I/O cards using shared backplane buses while maintaining noise immunity and fast edge rates. | Use Scenario: Driving LED indicators, relay coils, and CAN transceiver control lines in centralized vehicle body electronics. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer for microcontroller GPIO expansion in 12 V automotive subsystems. Use Value: Delivers ±24 mA per channel to drive LEDs directly and supports 5 V logic compatibility with legacy MCU peripherals. |
| Test Equipment Signal Routing | Medical Diagnostic Data Acquisition |
Use Scenario: Multiplexing and gating analog-to-digital converter reference paths and trigger signals in automated test equipment. IC Role / Device Role / Timing Role: Precision-controlled 3-state switch for time-critical signal path selection with minimal propagation delay variation. Use Value: Ensures sub-nanosecond inter-channel skew for synchronized sampling across multiple ADC channels. | Use Scenario: Buffering ECG, EEG, and pulse oximetry sensor outputs before digitization in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-power, rail-to-rail signal conditioner isolating sensitive analog front-end stages from noisy digital processing sections. Use Value: Achieves <80 μA quiescent current and 30% noise margin - critical for extended battery life and signal fidelity in Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC240N | Same AC logic family, identical electrical specs, but in PDIP-20 package (24.33 mm × 9.4 mm) | Through-hole mounting only; not suitable for high-density SMT production | Select when prototyping on breadboards or legacy through-hole PCBs requiring manual assembly |
| CD74ACT240M96 | TTL-compatible input thresholds (VIH = 2.0 V min), higher drive (±24 mA same), but narrower 4.5–5.5 V supply range | Requires strict 5 V supply; incompatible with 3.3 V or mixed-voltage systems | Choose only for pure 5 V systems needing TTL-level input compatibility and faster 7.8 ns propagation |
Compared with SN74AC240N and CD74ACT240M96, CD74AC240M uniquely combines SOIC-20 surface-mount compatibility, 1.5–5.5 V universal supply support, and industrial temperature rating - making it optimal for space-constrained, multi-voltage embedded controllers.
Availability
CD74AC240M is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical data acquisition requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for CD74AC240M includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability digital ICs.
The CD74AC240M belongs to TI's Advanced CMOS (AC) logic family, engineered for low-power, high-speed bus interface and signal routing in industrial and automotive control systems where voltage flexibility and noise immunity are critical.
FAQ
What is the maximum operating temperature for CD74AC240M?
The CD74AC240M is rated for operation from −40°C to +85°C, meeting industrial temperature requirements. This range is confirmed in TI's SCHS287C datasheet Section 4.2 and applies specifically to the CD74AC240M variant in SOIC-20 packaging - distinct from military-grade CD54 versions rated to +125°C.
Does CD74AC240M support 3.3 V logic systems?
Yes, CD74AC240M fully supports 3.3 V operation: its recommended supply range (1.5 V to 5.5 V) includes 3.3 V, and input thresholds (VIH = 2.1 V, VIL = 0.9 V at 3 V) provide 30% noise margin. The device maintains ±24 mA drive and 9.2 ns propagation delay at 3.3 V, as verified in Table 4-6 of the CD74AC240M datasheet.
How many output enable pins does CD74AC240M have, and what is their logic polarity?
CD74AC240M has two active-low output enable pins: 1OE (Pin 1) controls Bank 1 outputs (1Y0–1Y3), and 2OE (Pin 19) controls Bank 2 outputs (2Y0–2Y3). Both must be driven LOW to enable their respective bank outputs; HIGH places outputs in high-impedance state - confirmed in Table 3-1 and Figure 3-1 of TI SCHS287C.
Can CD74AC240M drive 50 Ω transmission lines directly?
Yes, CD74AC240M delivers ±24 mA output current per pin, which meets TI's specification for "drives 50 Ω transmission lines" under load conditions defined in Section 4.4 (VOH/VOL tests at −24 mA). This capability is validated across the full industrial temperature range and eliminates need for external line drivers in PCB trace or ribbon cable routing.
Is CD74AC240M pin-compatible with CD74ACT240M96?
No, CD74AC240M and CD74ACT240M96 share the same SOIC-20 (DW) package and pinout, but differ electrically: CD74AC240M accepts 1.5–5.5 V supplies with CMOS input thresholds, while CD74ACT240M96 requires 4.5–5.5 V and uses TTL-compatible inputs. Their shared pin mapping allows PCB reuse only if supply and interface logic are redesigned accordingly.
CD74AC240M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74AC240M FAQ
1.How can I place an order for CD74AC240M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC240M on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD74AC240M reliable?
The price and inventory of CD74AC240M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC240M is usually 5 days.
3.What payment methods are accepted for CD74AC240M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC240M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC240M?
CD74AC240M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC240M order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD74AC240M?
For technical support, including CD74AC240M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC240M requirements.
6.How does Aetrix verify that CD74AC240M is sourced from the original manufacturer or authorized distributors?
All CD74AC240M products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD74AC240M meets industry standards.
7.What is the process for return or replacement of CD74AC240M?
All CD74AC240M units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC240M, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD74AC240M part is unused and in its original packaging.
Return procedure for CD74AC240M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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