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Texas Instruments SN74ABT240AN
- Part No.:
- SN74ABT240AN
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT240AN.pdf
- Description:
- IC BUFFER INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:719
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Product details
Overview
SN74ABT240AN from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for memory address and bus driving applications. It features high-drive capability (–32 mA IOH, 64 mA IOL), Ioff support for partial-power-down mode, and operates over 4.5 V to 5.5 V supply at –40°C to 85°C. Its dual 4-bit architecture enables independent control of two output groups in systems requiring bidirectional bus isolation.
For engineers reviewing the SN74ABT240AN datasheet, SN74ABT240AN pinout, SN74ABT240AN application, or SN74ABT240AN equivalent, key selection criteria include its 20-pin PDIP package, inverted logic path per buffer, symmetric active-low OE inputs, and compatibility with TTL-level input thresholds and 5-V CMOS output drive strength in legacy industrial and test equipment designs.
Technical Context
The SN74ABT240AN implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) control. 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) to achieve fast propagation delays (tPLH/tPHL ≤ 4.8 ns at VCC = 5 V, CL = 50 pF) while maintaining robust noise immunity via hysteresis (Vhys = 100 mV).
Its Ioff circuitry actively disables outputs during power-down, limiting reverse current to ±100 µA when VCC = 0 V and VI/VO ≤ 4.5 V - critical for hot-swap and mixed-voltage system interoperability. Absolute maximum ratings include 7-V supply tolerance and 128-mA sink capability per output (SN74ABT240A variant), supporting legacy backplane loading requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS logic rails and stable operation across industrial temperature range. |
| Output drive | –32 mA IOH / 64 mA IOL - delivers sufficient current to drive multiple TTL loads or long PCB traces without external buffering. |
| Propagation delay | tPLH/tPHL ≤ 4.8 ns (VCC = 5 V, CL = 50 pF) - enables reliable timing in high-speed address/data bus applications up to ~100 MHz. |
| Ioff current | ±100 µA at VCC = 0 V - prevents damaging backflow during partial power-down, essential for hot-plug and multi-rail system safety. |
| Input hysteresis | Vhys = 100 mV - improves noise margin on slow-rising or noisy control lines such as manual reset or enable switches. |
| ESD rating | 2000-V HBM, 200-V MM - exceeds JEDEC JESD22 standards, reducing susceptibility to handling damage in manufacturing environments. |
Pinout & Package
SN74ABT240AN is housed in a 20-pin plastic dual in-line package (PDIP-N), 0.300-inch body width, with standard through-hole mounting and RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of each 4-bit buffer group; pull-up required for power-up high-Z safety. |
| 1A1–1A4, 2A1–2A4 | Inverting data inputs | Eight total inputs accepting TTL-compatible logic levels; inverted signal appears at corresponding Y outputs. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state outputs | Eight buffered, inverted outputs; high-impedance when respective OE is high. |
| VCC, GND | Power and ground | Single 5-V supply rail; decoupling capacitor recommended near pin 20 (VCC) and pin 10 (GND) for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| High-drive outputs | Delivers –32 mA source / 64 mA sink per output - eliminates need for external drivers in dense bus termination schemes. |
| Ioff partial-power-down | Prevents current backflow when powered off - enables safe insertion/removal in live backplanes and modular systems. |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD17 - ensures robustness against transient overcurrent events in industrial environments. |
| Ground bounce suppression | VOLP < 1 V at VCC = 5 V - reduces switching noise coupling into shared ground planes during simultaneous output transitions. |
Applications
| Memory Address Buffering | Legacy Bus Transceiver Interface |
|---|---|
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 octal buffer isolating CPU address outputs and enabling/disabling memory chip selects via OE control. Use Value: Ensures clean, high-current address signals across long traces while preventing contention during memory access arbitration. | Use Scenario: Interfacing between 5-V TTL logic and older ISA-style peripheral cards with bidirectional data paths. IC Role / Device Role / Timing Role: Direction-controlled 3-state driver providing level-shifting and bus isolation between master and slave devices. Use Value: Supports hot-swappable card insertion by maintaining high-Z state until fully powered and initialized. |
| Test Equipment Signal Conditioning | Industrial PLC I/O Expansion |
Use Scenario: Amplifying and conditioning digital stimulus signals in automated test fixtures with mixed-voltage DUTs. IC Role / Device Role / Timing Role: Inverting buffer with precise propagation delay matching used to synchronize parallel test vectors. Use Value: Enables deterministic timing alignment across 8-channel digital stimulus generation with sub-5-ns skew. | Use Scenario: Expanding discrete input/output points on programmable logic controllers using modular carrier boards. IC Role / Device Role / Timing Role: Isolating field-side digital inputs from controller logic while providing ESD-hardened signal conditioning. Use Value: Improves system reliability in electrically noisy factory environments via integrated 2000-V HBM protection and latch-up immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240ADW | SOIC-20 package (surface-mount), same electrical specs and pinout as SN74ABT240AN. | Requires PCB rework for SMT assembly; no through-hole compatibility. | Select when board space is constrained and automated pick-and-place is available. |
| SN74ABT240ANSR | SOP-20 package (narrow-body surface-mount), identical functional behavior and timing. | Different footprint and thermal resistance (θJA = 60°C/W vs. PDIP's 69°C/W); not mechanically interchangeable. | Choose for cost-sensitive volume production where SOP tape-and-reel logistics are preferred. |
Compared with SN74ABT240ADW and SN74ABT240ANSR, the SN74ABT240AN offers through-hole manufacturability, higher thermal mass for prototyping, and direct compatibility with breadboard and socket-based development - making it optimal for lab validation and low-volume industrial control hardware.
Availability
SN74ABT240AN is available at Aetrix Electronics and suitable for memory subsystem design, legacy bus interface development, and industrial I/O expansion requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT240AN 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 industrial and automotive electronics.
The SN74ABT240AN belongs to TI's ABT logic family, engineered for high-speed, high-drive 5-V bus interfacing in mission-critical industrial and test equipment where reliability and backward compatibility are paramount.
FAQ
What is the operating temperature range for the SN74ABT240AN?
The SN74ABT240AN is rated for industrial operation from –40°C to +85°C. This range is validated per TI's recommended operating conditions and supports deployment in harsh environments such as factory automation controllers, test instrumentation, and outdoor communications infrastructure where ambient thermal cycling occurs.
Does the SN74ABT240AN support partial-power-down functionality?
Yes, the SN74ABT240AN includes Ioff circuitry that disables outputs when VCC = 0 V, limiting reverse current to ±100 µA. This feature allows safe integration into systems with staggered power sequencing, such as modular backplanes or hot-swap I/O carriers, without risk of damaging current flow through the device.
What is the maximum output sink current specification for the SN74ABT240AN?
The SN74ABT240AN supports up to 64 mA of low-level output current (IOL) per pin under recommended operating conditions. This high sink capability enables direct driving of multiple TTL inputs or LED indicators without external transistors, simplifying board-level design in legacy digital systems.
How does the SN74ABT240AN handle input noise on its enable pins?
The SN74ABT240AN incorporates 100 mV of input hysteresis (Vhys) on all inputs including OE, which prevents false toggling due to slow-rising or noisy control signals. This ensures stable high-impedance state transitions even when OE is driven by mechanical switches or long cables in industrial settings.
Is the SN74ABT240AN pin-compatible with other members of the SN74ABT240 family?
Yes, the SN74ABT240AN shares identical pinout and logic function with all package variants of the SN74ABT240A series, including SOIC (DW), SSOP (DB), SOP (NS), and TSSOP (PW). Electrical characteristics and timing parameters are consistent across packages, enabling drop-in replacement in existing designs when changing form factor.
SN74ABT240AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ABT240AN FAQ
1.How can I place an order for SN74ABT240AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240AN 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 SN74ABT240AN reliable?
The price and inventory of SN74ABT240AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240AN is usually 5 days.
3.What payment methods are accepted for SN74ABT240AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT240AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT240AN?
SN74ABT240AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT240AN 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 SN74ABT240AN?
For technical support, including SN74ABT240AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240AN requirements.
6.How does Aetrix verify that SN74ABT240AN is sourced from the original manufacturer or authorized distributors?
All SN74ABT240AN 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 SN74ABT240AN meets industry standards.
7.What is the process for return or replacement of SN74ABT240AN?
All SN74ABT240AN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240AN, 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 SN74ABT240AN part is unused and in its original packaging.
Return procedure for SN74ABT240AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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