My Inquiry
My Account
Texas Instruments SN74ABT240ADBLE
- Part No.:
- SN74ABT240ADBLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT240ADBLE.pdf
- Description:
- BUS DRIVER, ABT SERIES, 4-BIT
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ABT240ADBLE 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 partial-power-down support, latch-up immunity >500 mA, and operates from 4.5 V to 5.5 V over –40°C to 85°C. Used in industrial control backplanes and legacy TTL-compatible data buses.
For engineers reviewing the SN74ABT240ADBLE datasheet, SN74ABT240ADBLE pinout, SN74ABT240ADBLE application, or SN74ABT240ADBLE equivalent, key selection criteria include output drive strength, 3-state enable timing (tPZL = 1.1 ns typ), Ioff current (<±100 µA at VCC = 0), and SSOP-20 package compatibility with space-constrained PCB layouts.
Technical Context
The SN74ABT240ADBLE implements two independent 4-bit inverting buffer sections, 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. The device uses ABT (Advanced BiCMOS Technology) logic, combining bipolar speed with CMOS power efficiency.
Its Ioff circuitry actively disables outputs during power-down to prevent backflow current, enabling safe hot-insertion in partial-power-down systems. Input thresholds are TTL-compatible (VIL = 0.8 V max, VIH = 2 V min), and output ground bounce (VOLP) is specified <1 V at 5 V supply and 25°C.
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 systems without level-shifting. |
| Output Drive | –32 mA IOH / 64 mA IOL - supports heavy capacitive loads and fan-out to multiple TTL inputs on shared buses. |
| Ioff Current | ±100 µA max at VCC = 0 - enables safe isolation during system power sequencing and hot-swap operation. |
| Propagation Delay | tPLH/tPHL = 1–4.8 ns (VCC = 5 V, CL = 50 pF) - meets timing requirements for high-speed address/data buffering in legacy microprocessor systems. |
| 3-State Enable Time | tPZL = 1.1 ns typ, tPHZ = 1.8 ns typ - guarantees fast bus release and acquisition critical for multiplexed memory or peripheral interfaces. |
| ESD Protection | 2000-V HBM, 200-V MM - exceeds JEDEC JESD22 standards for robustness in manufacturing and field environments. |
| Latch-Up Immunity | >500 mA per JESD17 - prevents destructive latch-up under transient overvoltage or ground-bounce conditions. |
Pinout & Package
SN74ABT240ADBLE is packaged in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 7.4 mm body width, and 2.0 mm max height - optimized for high-density PCB layouts while maintaining hand-solderability and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls high-impedance state of respective 4-bit buffer group; must be pulled high via resistor during power-up to ensure defined output state. |
| 1A1–1A4, 2A1–2A4 | Input terminals | Inverting data inputs for two independent 4-bit channels; TTL-compatible thresholds allow direct interfacing with legacy microcontrollers and ASICs. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting buffered outputs | Deliver inverted, high-drive signals; output impedance rises to >10⁶ Ω in 3-state mode, eliminating bus contention. |
| VCC (Pin 20) | Power supply | 5-V nominal supply; decoupling capacitor required within 10 mm to suppress switching noise and ground bounce. |
| GND (Pin 10) | Ground reference | Common return path for all I/O and internal logic; separate ground plane connection recommended for signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state buffers | Two independent 4-bit groups with separate OE controls enable flexible bus arbitration and direction management in bidirectional data paths. |
| High-output drive | 64-mA sink capability allows direct driving of up to 16 standard TTL loads, reducing need for external drivers in memory subsystems. |
| Ioff partial-power-down | Prevents damaging current flow when VCC = 0 and I/O pins are biased - essential for modular backplane and hot-plug applications. |
| Low ground bounce | VOLP <1 V at 5 V/25°C ensures stable logic thresholds during simultaneous output switching, improving noise margin in dense layouts. |
| TTL-compatible interface | VIH/VIL thresholds match legacy TTL families, enabling drop-in replacement in existing 5-V designs without redesign or level translation. |
Applications
| Memory Address Buffering | Legacy Bus Transceiver Interface |
|---|---|
Use Scenario: Driving address lines from a microprocessor to multiple SRAM or EPROM chips on a shared memory bus. IC Role / Device Role / Timing Role: Inverting buffer with 3-state control isolates address lines during DMA cycles or peripheral access, preventing bus contention. Use Value: High sink current (64 mA) ensures clean signal edges across long traces and multiple loads, while fast enable/disable times (<6.2 ns) minimize bus turnaround latency. | Use Scenario: Interfacing a 5-V microcontroller with legacy peripheral ICs using unidirectional data/control buses. IC Role / Device Role / Timing Role: Level-consistent inverting driver translating control signals (e.g., chip select, write enable) with precise timing alignment. Use Value: TTL-compatible input thresholds and 1–4.8 ns propagation delay guarantee setup/hold compliance with older peripherals operating at ≤20 MHz. |
| Industrial Backplane Driver | Hot-Swappable Module Interface |
Use Scenario: Buffering configuration signals across a 5-V industrial backplane connecting plug-in I/O modules. IC Role / Device Role / Timing Role: Robust address/data line driver with latch-up immunity (>500 mA) and ESD protection (2000-V HBM) for harsh factory environments. Use Value: Ground bounce <1 V and symmetrical drive reduce crosstalk and radiated emissions on densely routed backplanes. | Use Scenario: Enabling safe insertion/removal of powered modules in a partially powered chassis. IC Role / Device Role / Timing Role: Ioff-enabled buffer isolating module I/O from backplane during power-up/down sequences. Use Value: ±100 µA Ioff current prevents backfeed into unpowered sections, eliminating risk of damage or system reset during hot-swap events. |
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 | Same ABT core, SOIC-20 package (7.5 mm width vs. SSOP's 5.3 mm); higher θJA (58°C/W vs. 70°C/W). | Better thermal dissipation in low-airflow environments; requires larger PCB area. | Select when board layout allows SOIC footprint and thermal management prioritizes junction temperature over density. |
| SN74LVC240APWR | Lower voltage (1.65–3.6 V), CMOS-based, 24-mA drive; no Ioff or latch-up rating specified. | Not suitable for 5-V systems or hot-swap; lacks ABT's robustness in industrial settings. | Only consider for new 3.3-V designs where cost and power efficiency outweigh legacy compatibility and ruggedness requirements. |
Compared with SN74ABT240ADWR and SN74LVC240APWR, SN74ABT240ADBLE offers superior 5-V drive strength and proven Ioff/latch-up performance for industrial backplanes, while its SSOP-20 footprint delivers 30% smaller board area than SOIC alternatives without sacrificing reliability.
Availability
SN74ABT240ADBLE is available at Aetrix Electronics and suitable for industrial control backplanes, legacy microprocessor memory interfaces, and hot-swappable module interfaces requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT240ADBLE 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 heritage in industrial-grade interface ICs.
The ABT logic family, including SN74ABT240ADBLE, was engineered for high-speed, high-drive 5-V bus applications where reliability, noise immunity, and backward compatibility with TTL systems are critical.
FAQ
What is the maximum output sink current specification for SN74ABT240ADBLE?
The SN74ABT240ADBLE is rated for 64 mA low-level output current (IOL) at VCC = 4.5 V, enabling it to drive heavy capacitive loads or multiple TTL inputs. This value is confirmed in the "Recommended Operating Conditions" table of the official TI datasheet SCBS098I, and reflects worst-case drive capability under industrial temperature and voltage conditions. SN74ABT240ADBLE maintains this performance across its full operating range of –40°C to 85°C.
Does SN74ABT240ADBLE support partial-power-down operation?
Yes, SN74ABT240ADBLE includes Ioff circuitry that disables outputs when VCC = 0, limiting Ioff current to ±100 µA maximum. This feature prevents damaging current backflow during power sequencing or hot-swap events. The datasheet explicitly states "This device is fully specified for partial-power-down applications using Ioff," and the Ioff test condition (VCC = 0, VI or VO ≤ 4.5 V) is verified per JEDEC standards.
What package type and dimensions does SN74ABT240ADBLE use?
SN74ABT240ADBLE uses a 20-pin SSOP (Shrink Small Outline Package) with JEDEC MO-150 registration, 0.65 mm lead pitch, 7.4 mm body width, and 2.0 mm maximum height. Package drawings DB0020A confirm these mechanical dimensions, and tape-and-reel specifications indicate 2000 units per reel with 16.4 mm reel width - consistent with standard SSOP handling and automated assembly.
How does the 3-state enable timing of SN74ABT240ADBLE compare to similar octal buffers?
SN74ABT240ADBLE achieves tPZL = 1.1 ns typical and tPHZ = 1.8 ns typical enable/disable times at VCC = 5 V and CL = 50 pF - faster than legacy 74LS240 (≥15 ns) and competitive with other ABT-series devices. These values are measured per Figure 1 load circuit in SCBS098I and directly impact bus turnaround time in multiplexed memory or peripheral interfaces.
Is SN74ABT240ADBLE pin-compatible with SN74ABT240ADBR?
Yes, SN74ABT240ADBLE and SN74ABT240ADBR are identical in pinout, function, and electrical specifications - both are 20-pin SSOP-packaged variants of the SN74ABT240A octal inverting buffer. The "LE" suffix denotes a specific TI internal marking variant (e.g., AB240A), but TI's packaging addendum confirms identical DB package drawing, pin assignment, and mechanical dimensions for both part numbers.
SN74ABT240ADBLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ABT240ADBLE FAQ
1.How can I place an order for SN74ABT240ADBLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240ADBLE 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 SN74ABT240ADBLE reliable?
The price and inventory of SN74ABT240ADBLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240ADBLE is usually 5 days.
3.What payment methods are accepted for SN74ABT240ADBLE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT240ADBLE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT240ADBLE?
SN74ABT240ADBLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT240ADBLE 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 SN74ABT240ADBLE?
For technical support, including SN74ABT240ADBLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240ADBLE requirements.
6.How does Aetrix verify that SN74ABT240ADBLE is sourced from the original manufacturer or authorized distributors?
All SN74ABT240ADBLE 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 SN74ABT240ADBLE meets industry standards.
7.What is the process for return or replacement of SN74ABT240ADBLE?
All SN74ABT240ADBLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240ADBLE, 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 SN74ABT240ADBLE part is unused and in its original packaging.
Return procedure for SN74ABT240ADBLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ABT240ADBLE Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
