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Texas Instruments SN74ABT240ADW
- Part No.:
- SN74ABT240ADW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT240ADW.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:174
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Product details
Overview
SN74ABT240ADW from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for memory address and bus-oriented applications. It features high-drive capability (–32 mA IOH, 64 mA IOL), Ioff support for partial-power-down mode, and operates over –40°C to 85°C. Its SOIC-20 package enables dense PCB layouts in industrial control and data acquisition systems.
For engineers reviewing the SN74ABT240ADW datasheet, SN74ABT240ADW pinout, SN74ABT240ADW application, or SN74ABT240ADW equivalent, key selection criteria include output drive strength, 3-state enable timing (tPZH/tPLZ ≤ 5.8 ns), Ioff leakage (<±100 µA at VCC = 0), thermal resistance (θJA = 58°C/W), and compatibility with 5-V TTL/CMOS logic interfaces.
Technical Context
The SN74ABT240ADW implements two independent 4-bit inverting buffers, each controlled by a dedicated active-low output-enable (OE) input. Data flows from A inputs to Y outputs only when OE is low; otherwise, outputs enter high-impedance state. The device uses ABT (Advanced BiCMOS Technology) for improved speed and noise immunity over standard TTL.
Its Ioff circuitry actively disables outputs during power-down, preventing backflow current when VCC = 0 and VI or VO ≤ 4.5 V. Ground bounce (VOLP < 1 V at VCC = 5 V, TA = 25°C) and latch-up performance (>500 mA per JESD17) are specified for robust operation in mixed-signal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V logic rails and tolerates supply variation without functional degradation. |
| Output Drive | –32 mA IOH / 64 mA IOL - Supports heavy capacitive loads and fan-out to multiple TTL inputs without external buffering. |
| Ioff Leakage | ±100 µA at VCC = 0 - Enables safe hot-insertion and partial-power-down in backplane or modular systems. |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns (VCC = 5 V, CL = 50 pF) - Meets timing requirements for high-speed address/data bus driving up to ~200 MHz effective toggle rate. |
| Thermal Resistance | θJA = 58°C/W (SOIC-DW) - Allows sustained operation at full drive under natural convection in compact enclosures. |
| ESD Protection | 2000-V HBM, 200-V MM - Reduces risk of handling damage during assembly and field service. |
Pinout & Package
SN74ABT240ADW is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm, 2.65 mm max height, with 1.27 mm lead pitch and RoHS-compliant NiPdAu finish. Pin 1 index area located at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls high-impedance state for respective 4-bit buffer group; tie to VCC via pullup for power-up safety. |
| 1A1–1A4, 2A1–2A4 | Input data lines | Inverted data passed to corresponding Y outputs when OE is low; CMOS-compatible input thresholds (VIH = 2 V, VIL = 0.8 V). |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting buffered outputs | Drive external buses or memory addresses with rail-to-rail swing and high sink/source capability. |
| VCC, GND | Power supply terminals | Single 5-V supply; decoupling capacitor (0.1 µF) required near VCC pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | –32 mA source / 64 mA sink capability enables direct interface to unterminated transmission lines and legacy TTL loads. |
| Ioff Partial-Power-Down | Prevents damaging current flow when VCC = 0 and bus voltages remain present-critical for hot-swap backplanes. |
| Low Ground Bounce | VOLP < 1 V ensures signal integrity on shared ground planes during simultaneous output switching. |
| Latch-Up Immunity | Exceeds 500 mA per JEDEC JESD17, eliminating need for external current-limiting protection in harsh ESD environments. |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving address lines between microcontroller and SRAM/Flash in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting octal buffer isolating MCU address bus from memory array; enables clean edge transitions across 15-cm traces. Use Value: High sink current (64 mA) maintains VOL ≤ 0.55 V under 50-pF load, ensuring reliable address decoding at 25-MHz bus clock. | Use Scenario: Level-shifting and buffering between isolated CAN controller and RS-485 transceiver in factory automation nodes. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling shared data/control lines between isolated domains using 3-state control. Use Value: Ioff support allows one side to power down while maintaining bus integrity-no external isolation switches required. |
| Test Equipment Signal Conditioning | Digital I/O Expansion Module |
Use Scenario: Amplifying and conditioning digital stimulus signals in automated test equipment (ATE) channel cards. IC Role / Device Role / Timing Role: Inverting driver stage boosting signal slew rate and driving 100-Ω coaxial cables to DUT fixtures. Use Value: Propagation delay consistency (tPLH/tPHL variation < 1 ns) ensures sub-nanosecond timing alignment across 8 parallel channels. | Use Scenario: Expanding GPIO count on embedded ARM-based HMIs using parallel 8-bit latched I/O ports. IC Role / Device Role / Timing Role: Octal buffer isolating processor GPIO from relay drivers and optocouplers in noisy industrial environments. Use Value: ESD rating (2000-V HBM) prevents field failures due to operator contact discharge during panel servicing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240ANSR | SOP-20 package (8.4 mm × 13.0 mm); θJA = 60°C/W; same electrical specs. | Lower profile and wider body than SOIC-DW; better suited for wave-soldered boards with tight vertical clearance. | Select when SOP footprint matches existing board layout or when higher thermal margin is acceptable for lower-cost assembly. |
| SN74ABT240ADBR | SSOP-20 package (5.3 mm × 7.2 mm); θJA = 70°C/W; identical logic and timing behavior. | Narrower body and finer pitch (0.65 mm) enable higher density; requires reflow-only assembly. | Choose for space-constrained designs where PCB real estate is critical and thermal load remains within 600 mW. |
Compared with SN74ABT240ANSR and SN74ABT240ADBR, the SN74ABT240ADW offers the best balance of thermal performance (58°C/W), manufacturability (standard SOIC footprint), and mechanical robustness-making it optimal for mid-volume industrial control modules requiring long-term supply stability.
Availability
SN74ABT240ADW is available at Aetrix Electronics and suitable for industrial control, test equipment, and digital I/O expansion modules requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT240ADW 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74ABT240ADW belongs to TI's ABT logic family, engineered for high-speed, high-drive 3-state bus interfacing in noise-sensitive and thermally constrained applications.
FAQ
What is the maximum operating temperature range for the SN74ABT240ADW?
The SN74ABT240ADW is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in factory-floor PLCs, outdoor kiosks, and motor drive control units where environmental extremes are common. Thermal derating is not required below 85°C when θJA = 58°C/W and power dissipation remains under 600 mW.
Does the SN74ABT240ADW support hot-swap operation?
Yes, the SN74ABT240ADW supports partial-power-down via its Ioff feature: when VCC = 0 V and any input or output voltage is ≤ 4.5 V, leakage remains within ±100 µA. This prevents backfeed current during live insertion into powered backplanes-enabling safe hot-swap in modular instrumentation systems using the SN74ABT240ADW.
Can the SN74ABT240ADW drive a 50-pF load with guaranteed timing?
Yes, all switching characteristics-including tPLH (≤4.8 ns), tPHL (≤4.8 ns), tPZH (≤5.2 ns), and tPLZ (≤6.2 ns)-are specified at CL = 50 pF and VCC = 5 V. These values ensure predictable timing margins in standard PCB trace environments with typical interconnect capacitance, directly supporting SN74ABT240ADW use in synchronous bus architectures.
What is the recommended power supply decoupling for the SN74ABT240ADW?
A 0.1-µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND (Pin 10) is mandatory for stable operation. For systems with multiple SN74ABT240ADW devices or high-frequency switching, add a 4.7-µF bulk capacitor per 5–10 ICs. This suppresses ground bounce (VOLP < 1 V) and maintains SN74ABT240ADW output integrity under dynamic load conditions.
How does the SN74ABT240ADW differ from the SN74ABT240AN in functionality?
The SN74ABT240ADW and SN74ABT240AN share identical logic function, timing, drive strength, and electrical specifications. The sole difference is packaging: SN74ABT240ADW uses SOIC-DW (surface-mount), while SN74ABT240AN uses PDIP-N (through-hole). Both operate from –40°C to 85°C and support Ioff; no functional or performance trade-offs exist between them-only assembly method and thermal profile differ.
SN74ABT240ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ABT240ADW FAQ
1.How can I place an order for SN74ABT240ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240ADW 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 SN74ABT240ADW reliable?
The price and inventory of SN74ABT240ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240ADW is usually 5 days.
3.What payment methods are accepted for SN74ABT240ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT240ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT240ADW?
SN74ABT240ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT240ADW 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 SN74ABT240ADW?
For technical support, including SN74ABT240ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240ADW requirements.
6.How does Aetrix verify that SN74ABT240ADW is sourced from the original manufacturer or authorized distributors?
All SN74ABT240ADW 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 SN74ABT240ADW meets industry standards.
7.What is the process for return or replacement of SN74ABT240ADW?
All SN74ABT240ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240ADW, 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 SN74ABT240ADW part is unused and in its original packaging.
Return procedure for SN74ABT240ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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