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Texas Instruments SN74ABT240ADWRG4
- Part No.:
- SN74ABT240ADWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT240ADWRG4.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,970
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Product details
Overview
SN74ABT240ADWRG4 from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for memory address and bus interface applications. It features high-drive capability (–32 mA IOH, 64 mA IOL), Ioff support for partial-power-down operation, and operates over –40°C to 85°C with 4.5–5.5 V supply. It is used in industrial control backplanes and legacy data bus systems requiring robust signal integrity.
For engineers reviewing the SN74ABT240ADWRG4 datasheet, SN74ABT240ADWRG4 pinout, SN74ABT240ADWRG4 application, or SN74ABT240ADWRG4 equivalent, key selection criteria include output drive strength, 3-state enable timing (tPZH/tPLZ ≤ 5.2 ns), Ioff leakage (< ±100 µA at VCC = 0), thermal resistance (θJA = 58°C/W), and SOIC-20 package compatibility with IPC-7351 land patterns.
Technical Context
This device implements two independent 4-bit inverting buffer sections, each with a dedicated active-low output-enable (OE) input. Data propagation is strictly inverting: when OE is low, Y = NOT(A); when OE is high, outputs enter high-impedance state. The architecture supports bus-hold-free operation and avoids contention during power sequencing via Ioff circuitry.
It complies with JEDEC JESD-17 latch-up immunity (>500 mA) and JESD-22 ESD standards (2000-V HBM, 200-V MM). Input transition rate tolerance is 5 ns/V, and ground bounce (VOLP) remains below 1 V at VCC = 5 V and TA = 25°C - critical for noise-sensitive digital backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5-V TTL and mixed-voltage logic systems |
| Output Drive | –32 mA IOH / 64 mA IOL - enables direct driving of heavy capacitive loads (e.g., >50 pF buses) without external buffers |
| Ioff Leakage | ±100 µA max at VCC = 0 - prevents backflow current during hot-swap or partial power-down, protecting upstream drivers |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns (VCC = 5 V, CL = 50 pF) - supports >100 MHz bus toggle rates in point-to-point configurations |
| Enable/Disable Time | tPZH/tPLZ ≤ 5.2 ns - guarantees fast bus arbitration and minimizes glitch windows during state transitions |
| Thermal Resistance | θJA = 58°C/W (SOIC-DW) - allows sustained operation at full drive under 70°C ambient with minimal heatsinking |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
SN74ABT240ADWRG4 uses a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable inputs | Independent control of each 4-bit section; must be pulled up to VCC via resistor during power-up to ensure Hi-Z default |
| 1A1–1A4, 2A1–2A4 | Inverting data inputs | Input logic inverted and passed to corresponding Y outputs when OE is asserted low |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state outputs | Drive bus lines only when OE is low; float to Hi-Z otherwise - enables multi-driver bus sharing |
| VCC (Pin 10) | Positive supply | Must be decoupled locally with ≥0.1 µF ceramic capacitor; supplies both logic core and output drivers |
| GND (Pin 20) | Ground reference | Return path for all input/output currents; requires low-inductance connection to minimize ground bounce (VOLP < 1 V) |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | Delivers –32 mA source / 64 mA sink per output - eliminates need for external line drivers in dense PCB layouts |
| Ioff Partial-Power-Down | Disables outputs and limits leakage to ±100 µA when VCC = 0 - enables safe insertion/removal in live-backplane systems |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V - maintains signal integrity on shared ground planes with multiple switching outputs |
| Latch-Up Immunity | Exceeds 500 mA per JEDEC JESD-17 - ensures robustness against transient overcurrent events in industrial environments |
| ESD Protection | 2000-V HBM and 200-V MM - reduces risk of field failure during assembly and handling without added TVS components |
Applications
| Memory Address Buffering | Legacy Data Bus Interface |
|---|---|
Use Scenario: Driving address lines from microcontroller to SRAM or EPROM in industrial PLC modules. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address bus from memory array; enables memory-mapped I/O expansion. Use Value: High sink current (64 mA) ensures clean low-level signaling across 10+ cm traces; tPLH ≤ 4.8 ns supports 20-MHz address setup timing. | Use Scenario: Interfacing ISA-style parallel data buses between legacy instrumentation controllers and ADC/DAC cards. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control per 4-bit segment for read/write direction management. Use Value: Independent 1OE/2OE pins allow staggered enable timing to prevent bus contention; Ioff protects powered-down peripherals. |
| Industrial Backplane Driver | Test Equipment Signal Conditioning |
Use Scenario: Level-shifting and fanout amplification of control signals across modular rack-mounted test systems. IC Role / Device Role / Timing Role: Octal inverting buffer providing noise-immune signal distribution with controlled edge rates (5 ns/V input slew). Use Value: Low VOLP (<1 V) and high ESD rating (2000-V HBM) maintain signal fidelity in electrically noisy factory-floor environments. | Use Scenario: Isolating DUT (device under test) digital stimulus signals from ATE controller logic during functional testing. IC Role / Device Role / Timing Role: 3-state buffer enabling test pattern injection while preventing feedback into controller outputs during measurement phases. Use Value: Fast disable time (tPLZ ≤ 5.8 ns) ensures precise timing window control; θJA = 58°C/W supports continuous test mode operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240ADBR | SSOP-20 package (7.4 mm × 5.0 mm), θJA = 70°C/W, same electrical specs | Better board density but higher thermal resistance; requires tighter layout clearance | Select for space-constrained designs where thermal margin >15°C is available |
| SN74ABT240APWR | TSSOP-20 package (6.5 mm × 4.4 mm), θJA = 83°C/W, identical logic and drive | Smallest footprint but lowest thermal performance; not recommended for >50% duty-cycle bus activity | Choose only for ultra-dense portable test equipment with forced-air cooling |
Compared with SN74ABT240ADBR and SN74ABT240APWR, the SN74ABT240ADWRG4 offers optimal balance of thermal performance (58°C/W), industry-standard SOIC footprint, and proven reliability in long-lifecycle industrial backplanes - making it the preferred choice for fixed-mount control systems.
Availability
SN74ABT240ADWRG4 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy data bus interfaces, memory address buffering, and test equipment signal conditioning requiring stable component supply across extended production lifecycles.
Supply support for SN74ABT240ADWRG4 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 and embedded processing solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74ABT240A family was engineered for high-reliability 5-V bus interfacing in mission-critical industrial systems, emphasizing drive strength, noise immunity, and power-down safety - directly addressing legacy infrastructure upgrade challenges.
FAQ
What is the maximum operating temperature range for SN74ABT240ADWRG4?
The SN74ABT240ADWRG4 is rated for operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and applies to the SOIC-DW package variant. Thermal derating is not required within this span when θJA = 58°C/W and power dissipation remains below 500 mW. The SN74ABT240ADWRG4 maintains full electrical compliance across the entire range, including Ioff functionality and output drive strength.
Does SN74ABT240ADWRG4 support hot-swap or live-insertion?
Yes, the SN74ABT240ADWRG4 supports partial-power-down operation via its Ioff feature. When VCC = 0 V, Ioff limits input/output leakage to ±100 µA, preventing damaging current backflow from live bus lines into the unpowered device. This enables safe insertion into energized backplanes - provided OE pins are held high (via pullup) to maintain outputs in high-impedance state during power ramp-up. The SN74ABT240ADWRG4 does not require external isolation circuitry for this function.
What is the recommended pullup resistor value for OE pins on SN74ABT240ADWRG4?
The minimum OE pullup resistor value for SN74ABT240ADWRG4 is determined by the current-sinking capability of the driving source. TI specifies that OE must be tied to VCC through a pullup to ensure high-impedance state during power-up. For standard 5-V CMOS drivers with 20-µA sink capability, a 10-kΩ resistor is typical. Lower values (e.g., 4.7 kΩ) improve noise immunity but increase static current; the SN74ABT240ADWRG4 itself draws no DC current into OE when high.
Can SN74ABT240ADWRG4 drive a 50-pF load at 20 MHz without signal degradation?
Yes, the SN74ABT240ADWRG4 is characterized with CL = 50 pF and delivers tPLH/tPHL ≤ 4.8 ns at VCC = 5 V and TA = 25°C, supporting >100 MHz toggle rates in point-to-point configurations. Its 64-mA sink capability ensures fast low-to-high transitions even under 50-pF loading. However, for sustained 20-MHz bus operation, ensure proper VCC decoupling (0.1 µF ceramic near Pin 10) and minimize trace inductance to contain ground bounce (VOLP < 1 V), as confirmed in the SN74ABT240ADWRG4 datasheet.
Is SN74ABT240ADWRG4 pin-compatible with older SN74ABT240 variants?
Yes, the SN74ABT240ADWRG4 shares identical pinout, logic function, and DC/AC specifications with all SN74ABT240A variants in SOIC-DW packaging (e.g., SN74ABT240ADW, SN74ABT240ADWR). Differences are limited to tape-and-reel packaging (G4 suffix denotes RoHS-compliant green packaging) and updated MSL/lead-finish compliance - no electrical or mechanical redesign affects interoperability. The SN74ABT240ADWRG4 may replace earlier DW-packaged versions without PCB or firmware changes.
SN74ABT240ADWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
SN74ABT240ADWRG4 FAQ
1.How can I place an order for SN74ABT240ADWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240ADWRG4 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 SN74ABT240ADWRG4 reliable?
The price and inventory of SN74ABT240ADWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240ADWRG4 is usually 5 days.
3.What payment methods are accepted for SN74ABT240ADWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT240ADWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT240ADWRG4?
SN74ABT240ADWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT240ADWRG4 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 SN74ABT240ADWRG4?
For technical support, including SN74ABT240ADWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240ADWRG4 requirements.
6.How does Aetrix verify that SN74ABT240ADWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT240ADWRG4 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 SN74ABT240ADWRG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT240ADWRG4?
All SN74ABT240ADWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240ADWRG4, 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 SN74ABT240ADWRG4 part is unused and in its original packaging.
Return procedure for SN74ABT240ADWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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