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Texas Instruments SN74ABT240ANSR
- Part No.:
- SN74ABT240ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT240ANSR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,292
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Product details
Overview
SN74ABT240ANSR 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 partial-power-down support, and operates over –40°C to 85°C with 4.5 V–5.5 V supply. It is used in industrial control backplanes and legacy data bus isolation.
For engineers reviewing the SN74ABT240ANSR datasheet, SN74ABT240ANSR pinout, SN74ABT240ANSR application, or SN74ABT240ANSR equivalent, key selection criteria include guaranteed 3-state output isolation, TTL-compatible input thresholds, low ground bounce (<1 V), latch-up immunity (>500 mA), and SOP-20 package compatibility with board-level signal integrity constraints.
Technical Context
The SN74ABT240ANSR implements two independent 4-bit inverting buffers, each controlled by a dedicated active-low output-enable (OE) input. Its logic function is strictly inverting: when OE is low, Y = NOT A; when OE is high, outputs enter high-impedance state. No internal pull-ups or level-shifting circuitry is present.
It uses ABT (Advanced BiCMOS Technology) process to achieve high-speed switching (tPLH/tPHL ≤ 4.8 ns at 5 V, CL = 50 pF) while maintaining robust ESD protection (2000-V HBM, 200-V MM) and Ioff-enabled power-down safety. All inputs are TTL-compatible with VIH = 2 V min, VIL = 0.8 V max.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V–5.5 V - Ensures compatibility with standard 5-V TTL and mixed-voltage system rails. |
| Output Drive | –32 mA IOH / 64 mA IOL - Supports heavy capacitive loads and fan-out to ≥10 standard TTL inputs. |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns (VCC = 5 V, CL = 50 pF) - Enables reliable operation in sub-10-ns timing-critical bus paths. |
| Ioff Current | ±100 µA at VCC = 0 - Prevents backflow current during hot-insertion or partial power-down sequences. |
| ESD Rating | 2000-V HBM, 200-V MM - Meets industrial handling requirements without external protection diodes. |
| Operating Temp | –40°C to +85°C - Qualified for extended-temperature industrial environments, not automotive or military. |
Pinout & Package
SOP-20 (Small Outline Package, 20-pin, 0.635 mm pitch, 7.5 mm × 12.8 mm body, 2.0 mm max height) per JEDEC MO-150, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of each 4-bit buffer group; must be pulled high via resistor during power-up to ensure Hi-Z default. |
| 1A1–1A4, 2A1–2A4 | Inverting input | Eight TTL-compatible digital inputs; inverted logic passed to corresponding Y outputs when OE is asserted. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state output | Eight high-drive outputs; actively driven low/high when OE = L, high-impedance when OE = H. |
| VCC, GND | Power supply | Single 5-V rail; decoupling capacitor required within 1 cm of VCC pin to suppress ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | –32 mA source / 64 mA sink enables direct driving of unterminated 50-Ω transmission lines or multiple TTL loads without external buffers. |
| Ioff Partial-Power-Down | Prevents damaging current flow when VCC = 0 but bus signals remain active - critical for hot-swap backplane designs. |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C ensures clean signal edges and reduces crosstalk in dense PCB layouts. |
| Latch-Up Immunity | Exceeds 500 mA per JESD17 - eliminates need for external current-limiting resistors in noisy industrial environments. |
| TTL-Compatible Inputs | VIH = 2 V min / VIL = 0.8 V max allows seamless interfacing with legacy 5-V microcontrollers and FPGAs without level shifters. |
Applications
| Memory Address Buffering | Legacy Bus Isolation |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or EPROM chips on a shared bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing fan-out gain and bus contention prevention during chip select transitions. Use Value: Eliminates address skew with tPHL ≤ 4.8 ns and supports up to 64 mA load per line without signal degradation. | Use Scenario: Isolating ISA or PCI-legacy control signals between processor and peripheral cards in modular industrial controllers. IC Role / Device Role / Timing Role: Directional signal isolator enabling bidirectional bus arbitration using separate OE controls. Use Value: Ioff protection prevents backfeed damage during card insertion/removal while maintaining signal integrity at 5 V. |
| Industrial Backplane Interface | Test Equipment Signal Conditioning |
Use Scenario: Level-shifting and buffering control signals across long backplane traces in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: High-noise-margin buffer mitigating ground bounce and EMI-induced glitches on 20+ cm traces. Use Value: 2000-V HBM ESD rating and <1 V VOLP reduce field failure rates in factory-floor environments. | Use Scenario: Conditioning digital stimulus/response signals in automated test equipment (ATE) channel drivers. IC Role / Device Role / Timing Role: Precision-controlled 3-state driver synchronizing with test pattern generators via OE timing. Use Value: Tight propagation delay matching (tPLH/tPHL variation ≤ 0.7 ns) ensures deterministic timing across 8-channel parallel test vectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240ADWR | SOIC-20 package (7.5 mm × 12.8 mm, 1.27 mm pitch); θJA = 58°C/W vs. NS package's 60°C/W. | Better thermal performance in high-density layouts; requires different land pattern and stencil design. | Preferred for new SOIC-based designs requiring higher thermal margin and broader distributor availability. |
| SN74ABT240APWR | TSSOP-20 package (4.4 mm × 5.0 mm, 0.65 mm pitch); lower profile (1.2 mm max height) but higher θJA = 83°C/W. | Space-constrained portable or modular test equipment where board area is premium. | Select only when footprint reduction outweighs thermal derating needs; verify layout cooling provisions. |
Compared with SN74ABT240ANSR, the SOIC variant offers superior thermal management for sustained high-current operation, while the TSSOP variant trades thermal performance for compactness - neither is pin-compatible due to differing pitch and pad geometry, requiring PCB redesign.
Availability
SN74ABT240ANSR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy bus isolation, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT240ANSR 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 industrial-grade product development.
The ABT logic family, including SN74ABT240ANSR, was engineered for high-speed, high-drive 5-V bus interface applications in industrial and communications infrastructure - prioritizing noise immunity, latch-up robustness, and power-down safety.
FAQ
What is the maximum output current rating for SN74ABT240ANSR?
The SN74ABT240ANSR supports –32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) under recommended operating conditions. These values are guaranteed across temperature and voltage ranges and define the device's ability to drive heavy capacitive or resistive loads without exceeding safe junction temperatures.
Does SN74ABT240ANSR support partial power-down operation?
Yes, SN74ABT240ANSR includes Ioff circuitry that disables outputs and limits current to ±100 µA when VCC = 0 V, preventing damaging backflow during hot-swap or partial system power-down. This feature is explicitly characterized and tested per datasheet Section 6.5.
What is the recommended pull-up resistor value for OE pins on SN74ABT240ANSR?
TI recommends tying OE to VCC through a pull-up resistor to ensure high-impedance state during power-up. The minimum value depends on the driver's current-sinking capability; for standard 5-V CMOS drivers, 4.7 kΩ is typical. The exact value must be verified against the sourcing capability of the upstream control signal.
Is SN74ABT240ANSR pin-compatible with SN74ABT240ADWR or SN74ABT240APWR?
No, SN74ABT240ANSR (SOP-20, 0.635 mm pitch) is not pin-compatible with SN74ABT240ADWR (SOIC-20, 1.27 mm pitch) or SN74ABT240APWR (TSSOP-20, 0.65 mm pitch). While all share identical pin functions and numbering, mechanical pitch and land pattern dimensions differ - PCB redesign is required for substitution.
What is the absolute maximum supply voltage for SN74ABT240ANSR?
The absolute maximum supply voltage for SN74ABT240ANSR is 7 V, as specified in the Absolute Maximum Ratings table. Operation above 5.5 V (recommended max) risks permanent damage, even briefly, and voids TI's warranty - sustained use must remain within 4.5 V–5.5 V.
SN74ABT240ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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-SO
SN74ABT240ANSR FAQ
1.How can I place an order for SN74ABT240ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240ANSR 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 SN74ABT240ANSR reliable?
The price and inventory of SN74ABT240ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240ANSR is usually 5 days.
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SN74ABT240ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT240ANSR 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 SN74ABT240ANSR?
For technical support, including SN74ABT240ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240ANSR requirements.
6.How does Aetrix verify that SN74ABT240ANSR is sourced from the original manufacturer or authorized distributors?
All SN74ABT240ANSR 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 SN74ABT240ANSR meets industry standards.
7.What is the process for return or replacement of SN74ABT240ANSR?
All SN74ABT240ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240ANSR, 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 SN74ABT240ANSR part is unused and in its original packaging.
Return procedure for SN74ABT240ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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