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Texas Instruments SN74ABT240ADWR
- Part No.:
- SN74ABT240ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT240ADWR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,945
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Product details
Overview
SN74ABT240ADWR 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. Its SOIC-20 package supports high-density PCB layouts in industrial control and data acquisition systems.
For engineers reviewing the SN74ABT240ADWR datasheet, SN74ABT240ADWR pinout, SN74ABT240ADWR application, or SN74ABT240ADWR equivalent, this page delivers verified electrical specs, functional behavior under 3-state control, thermal performance (θJA = 58°C/W), and real-world use cases in bus buffering and level translation scenarios.
Technical Context
The SN74ABT240ADWR implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) inputs. Data inversion occurs only when OE is low; outputs enter high-impedance state when OE is high - enabling bidirectional bus control without external logic.
Its ABT logic family delivers TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), robust noise immunity (Vhys = 100 mV), and fast switching (tPLH/tPHL ≤ 4.8 ns at VCC = 5 V, CL = 50 pF). Ioff circuitry limits current backflow during power sequencing, satisfying partial-power-down requirements per JEDEC JESD78.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS systems |
| IOH / IOL | –32 mA / 64 mA - drives heavy capacitive loads and multiple TTL inputs without signal degradation |
| tPLH / tPHL | 1 ns (min) / 4.8 ns (max) - enables reliable operation in high-speed address/data buses up to ~200 MHz |
| Ioff | ±100 µA at VCC = 0 - prevents damaging back-current during hot-insertion or staggered power-up sequences |
| θJA | 58°C/W (SOIC-DW) - defines thermal derating for continuous operation at ambient temperatures up to 85°C |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial-grade ESD robustness requirements without external protection |
| VOL / VOH | 0.55 V (at 64 mA), 2.0 V (at –32 mA) - guarantees valid logic levels under full load, supporting cascaded ABT/TTL stages |
Pinout & Package
SN74ABT240ADWR uses a 20-pin SOIC (DW) package with 0.38 mm lead pitch, 7.4 mm body width, and 2.65 mm max height. Pin 1 index area is marked on the top-side marking "ABT240A".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls respective 4-bit buffer group; tie to VCC via pullup for power-up high-Z safety |
| 1A1–1A4, 2A1–2A4 | Input terminals | Invert and drive corresponding Y outputs; require VIH ≥ 2 V / VIL ≤ 0.8 V for guaranteed switching |
| 1Y1–1Y4, 2Y1–2Y4 | Inverted 3-state outputs | Drive external loads only when OE is low; present high-Z impedance otherwise - essential for bus arbitration |
| GND (Pin 10), VCC (Pin 20) | Power supply connections | Decoupling capacitor (0.1 µF) required near VCC/GND pins to suppress ground bounce (VOLP < 1 V) |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state buffers | Two independent 4-bit groups allow selective bus isolation and polarity control in multi-drop systems |
| High-drive outputs | 64-mA sink capability eliminates need for external drivers in memory address line fanout |
| Ioff partial-power-down | Enables safe insertion into live backplanes by blocking reverse current flow when VCC = 0 |
| Low ground bounce | VOLP < 1 V at 5 V/25°C ensures signal integrity during simultaneous output switching |
| Latch-up immunity | Exceeds 500 mA per JESD17 - suitable for harsh industrial environments with voltage transients |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving address lines from microcontroller to SRAM or EPROM in embedded controllers. IC Role / Device Role / Timing Role: Inverting buffer with 3-state control isolates address bus during DMA cycles. Use Value: High-drive capability ensures clean edges across long traces; Ioff prevents backfeed during reset. | Use Scenario: Level-shifting and bus contention management between PLC CPU and I/O modules. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling shared data path with controlled directionality. Use Value: Fast enable/disable times (< 7.7 ns) minimize bus turnaround latency in cyclic scan architectures. |
| Test Equipment Signal Routing | Legacy System Upgrades |
Use Scenario: Multiplexing stimulus signals to DUT pins in automated test fixtures. IC Role / Device Role / Timing Role: Output-enable-controlled signal gate for channel selection. Use Value: Low VOLP and tight propagation skew ensure timing-critical pattern fidelity across 8 channels. | Use Scenario: Replacing obsolete 74LS240 in retrofitted CNC machine controllers. IC Role / Device Role / Timing Role: Pin-compatible upgrade delivering higher speed and lower power than LS logic. Use Value: Direct drop-in replacement with identical pinout and improved noise margin (100 mV hysteresis). |
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 (7.5 mm × 5.3 mm), θJA = 70°C/W, same electrical specs | Better board density but higher thermal resistance - preferred for space-constrained designs with adequate airflow | Select when footprint reduction outweighs thermal margin needs; verify layout cooling for >50 mA total IOL |
| SN74ABT244ADWR | Noninverting outputs, identical pinout and drive strength, same SOIC-DW package | Used where signal polarity must be preserved (e.g., clock distribution, noninverting bus drivers) | Choose when system logic requires true (noninverted) buffering - no change to PCB layout required |
Compared with SN74ABT240ADBR and SN74ABT244ADWR, the SN74ABT240ADWR offers optimal thermal performance in SOIC packaging while maintaining strict inverting functionality - critical for legacy bus protocols requiring inverted address strobes or chip-select generation.
Availability
SN74ABT240ADWR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for SN74ABT240ADWR 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 decades of industrial reliability validation.
The ABT logic family - including SN74ABT240ADWR - was engineered for high-speed, high-drive bus interfacing in memory and control systems where signal integrity and power sequencing resilience are critical.
FAQ
What is the function of the OE pins on SN74ABT240ADWR?
The SN74ABT240ADWR has two active-low output-enable pins: 1OE controls the first 4-bit inverting buffer group (1A1–1A4 → 1Y1–1Y4), and 2OE controls the second (2A1–2A4 → 2Y1–2Y4). When OE is low, data passes through with inversion; when high, outputs go high-impedance. This allows independent control of two bus segments - essential for multiplexed memory or peripheral addressing in the SN74ABT240ADWR.
Does SN74ABT240ADWR support partial-power-down operation?
Yes, SN74ABT240ADWR includes Ioff circuitry that disables outputs and limits current to ±100 µA when VCC = 0, preventing damaging backflow during hot-swap or staggered power sequencing. This feature is explicitly validated per JEDEC JESD78 and makes the SN74ABT240ADWR suitable for modular backplane systems where boards may be inserted while main power remains active.
What is the maximum output current rating for SN74ABT240ADWR?
The SN74ABT240ADWR is rated for –32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to 85°C). These values are specified per output and reflect sustained DC drive capability - critical for driving multiple TTL inputs or terminating transmission lines in the SN74ABT240ADWR's target applications.
Can SN74ABT240ADWR replace older 74LS240 devices?
Yes, SN74ABT240ADWR is a direct pin-compatible and functionally equivalent upgrade to 74LS240, offering faster propagation (≤4.8 ns vs. ~15 ns), higher drive strength (64 mA vs. 8 mA), and improved noise immunity (100 mV hysteresis). No PCB changes are needed - the SN74ABT240ADWR maintains identical SOIC-20 pinout and logic behavior, making it ideal for retrofitting legacy industrial controllers.
What thermal considerations apply to SN74ABT240ADWR in continuous operation?
With θJA = 58°C/W in its SOIC-DW package, SN74ABT240ADWR requires careful thermal design: at 85°C ambient and 100 mA total output current, junction temperature approaches 143°C - exceeding absolute max. Derate power using the formula TJ = TA + (θJA × PD); keep PD < 435 mW for safe operation. The SN74ABT240ADWR datasheet specifies ICC ≤ 30 mA max under full load, confirming typical power dissipation stays within safe margins when properly decoupled.
SN74ABT240ADWR 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:
- 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
SN74ABT240ADWR FAQ
1.How can I place an order for SN74ABT240ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240ADWR 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 SN74ABT240ADWR reliable?
The price and inventory of SN74ABT240ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240ADWR is usually 5 days.
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SN74ABT240ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT240ADWR 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 SN74ABT240ADWR?
For technical support, including SN74ABT240ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240ADWR requirements.
6.How does Aetrix verify that SN74ABT240ADWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT240ADWR 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 SN74ABT240ADWR meets industry standards.
7.What is the process for return or replacement of SN74ABT240ADWR?
All SN74ABT240ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240ADWR, 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 SN74ABT240ADWR part is unused and in its original packaging.
Return procedure for SN74ABT240ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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