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NXP Semiconductors 74ABT240DB,118
- Part No.:
- 74ABT240DB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT240DB,118.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,978
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Product details
Overview
74ABT240DB,118 from NXP Semiconductors (formerly Philips) is an octal inverting 3-state buffer optimized for high-speed bus interface applications. It features dual output enables (1OE, 2OE), ±64mA/–32mA drive capability, 3.1ns typical propagation delay at 5V/50pF, and operates across –40°C to +85°C. It is used in address/data bus driving, memory interfacing, and system-level signal isolation.
For engineers reviewing the 74ABT240DB,118 datasheet, 74ABT240DB,118 pinout, 74ABT240DB,118 application, or 74ABT240DB,118 equivalent, key selection criteria include 3-state timing (tPZH/tPLZ), output drive asymmetry (+64mA sink / –32mA source), BiCMOS power-performance trade-off, and SSOP-20 package compatibility with legacy 74-series logic footprints.
Technical Context
The 74ABT240DB,118 implements two independent 4-bit inverting buffer groups, each controlled by a dedicated output enable (1OE or 2OE). Its BiCMOS architecture delivers low dynamic power while sustaining 3.1ns propagation delay and sub-5ns 3-state enable/disable times under 50pF load.
It supports live insertion/extraction and power-up 3-state behavior, with latch-up immunity >500mA per JEDEC Std 17 and ESD protection >2kV HBM. Input voltage range extends to –1.2V to +7.0V, and absolute max VCC is +7.0V - enabling robust operation in mixed-voltage or transient-prone environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting buffer with dual 3-state control (1OE, 2OE) |
| Propagation Delay (tPLH/tPHL) | 3.1 ns typical at VCC = 5V, CL = 50pF - defines maximum bus toggle rate in synchronous systems |
| Output Drive | +64 mA sink / –32 mA source - supports heavy capacitive loads and fan-out to multiple TTL/CMOS inputs |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5V logic rails and tolerant of supply ripple |
| Operating Temperature | –40°C to +85°C - qualified for industrial and extended commercial environments |
| Input Capacitance | 4 pF - minimizes loading on upstream drivers and preserves signal edge integrity |
| 3-State Leakage (IOZL/IOZH) | ±5 µA max at VCC = 5.5V - ensures low off-state current in high-impedance bus segments |
Pinout & Package
74ABT240DB,118 is housed in a 20-pin plastic SSOP Type II package (SOT339-1), 0.65 mm pitch, body width 5.3 mm, compliant with JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - independently disable Group 1 (pins 18,16,14,12) or Group 2 (pins 9,7,5,3) |
| 2,4,6,8 | 1A0–1A3 | Inverting input group 1 - drives corresponding 1Y outputs with logic inversion |
| 11,13,15,17 | 2A0–2A3 | Inverting input group 2 - drives corresponding 2Y outputs with logic inversion |
| 18,16,14,12 | 1Y0–1Y3 | Inverted outputs for group 1 - high-impedance when 1OE = HIGH |
| 9,7,5,3 | 2Y0–2Y3 | Inverted outputs for group 2 - high-impedance when 2OE = HIGH |
| 10 | GND | Ground reference - must be low-inductance connection to minimize switching noise |
| 20 | VCC | +5V supply - requires local 0.1 µF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Enables 3.1 ns propagation delay with <250 µA quiescent ICCZ - balances speed and static power |
| Dual independent 3-state controls | Allows selective bus partitioning - e.g., isolate memory vs. I/O subsystems without global reset |
| Power-up 3-state behavior | Outputs remain high-impedance during VCC ramp-up - prevents bus contention at power-on |
| Live insertion/extraction support | Withstands hot-plug transients - enables modular backplane designs with field-replaceable cards |
| Latch-up immunity >500 mA | Meets JEDEC Std 17 - ensures reliability in noisy industrial environments with ground bounce or EFT events |
Applications
| Memory Address Bus Driver | PCI Local Bus Isolation |
|---|---|
Use Scenario: Driving multiplexed address lines between CPU and SRAM/Flash in embedded controllers. IC Role / Device Role / Timing Role: Inverting buffer with 3-state control isolates address bus during DMA cycles or peripheral access. Use Value: ±64mA/–32mA drive sustains signal integrity across 10+ cm PCB traces; tPZH < 4.8 ns ensures setup/hold compliance with 25 MHz bus clocks. | Use Scenario: Isolating PCI slot signals (AD[31:0], C/BE#) from motherboard logic during card hot-swap. IC Role / Device Role / Timing Role: Dual-enable octal buffer provides directional isolation and prevents back-driving during insertion. Use Value: Power-up 3-state and live-insertion rating eliminate need for auxiliary sequencing circuitry or hot-swap controllers. |
| Industrial PLC I/O Expansion | Legacy ISA Bus Interface |
Use Scenario: Level-shifting and buffering digital I/O signals between microcontroller and opto-isolated field terminals. IC Role / Device Role / Timing Role: Inverting buffer translates logic levels while providing current gain and bus contention protection. Use Value: –40°C to +85°C rating and >500 mA latch-up immunity ensure operation in uncontrolled cabinet environments with EMI exposure. | Use Scenario: Interfacing modern FPGA-based ISA masters to legacy ISA peripherals requiring strict 74-series timing. IC Role / Device Role / Timing Role: Pin-compatible replacement for obsolete 74LS240 with improved speed and drive strength. Use Value: 3.1 ns tPLH and 4 pF CIN match ISA timing budgets while reducing trace termination complexity versus bipolar equivalents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240DBR | TI version in same SSOP-20 package; identical AC/DC specs but different ESD rating (1500 V HBM vs. 2000 V) | Valid for new designs where TI sourcing is preferred; not drop-in for MIL-STD-883-compliant systems requiring 2000 V HBM | Select when supply chain diversification is required and HBM spec margin is acceptable |
| 74LVT240PW,118 | NXP 3.3V variant (VCC = 2.7–3.6V); lower drive (±32mA), faster tPLH (2.3 ns), incompatible supply voltage | Not suitable for 5V systems; requires level translation if interfacing with 5V buses | Choose only for 3.3V-only designs prioritizing lower power and higher speed over 5V compatibility |
Compared with SN74ABT240DBR and 74LVT240PW,118, the 74ABT240DB,118 uniquely supports 5V operation with 2000 V HBM ESD and live insertion - making it the sole choice for industrial 5V backplanes requiring both robustness and hot-swap capability.
Availability
74ABT240DB,118 is available at Aetrix Electronics and suitable for memory address bus driving, PCI local bus isolation, and industrial PLC I/O expansion requiring stable component supply and long-term industrial temperature support.
Supply support for 74ABT240DB,118 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
NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity solutions and high-performance logic.
The 74ABT family was designed for high-speed 5V bus interface applications requiring superior drive strength and noise immunity over standard TTL or CMOS logic - targeting industrial control, telecom infrastructure, and legacy computing platforms.
FAQ
What is the maximum operating supply voltage for the 74ABT240DB,118?
The 74ABT240DB,118 has an absolute maximum DC supply voltage (VCC) of +7.0 V, though its recommended operating range is strictly 4.5 V to 5.5 V. Operation above 5.5 V voids guaranteed AC/DC performance and risks accelerated wear-out. The 74ABT240DB,118 must be powered within this 4.5–5.5 V window to meet published propagation delay, drive strength, and leakage specifications.
Does the 74ABT240DB,118 support hot-swap or live insertion?
Yes, the 74ABT240DB,118 explicitly supports live insertion and extraction per its product specification. This is enabled by its power-up 3-state behavior and robust input/output clamping design. During hot insertion, the 74ABT240DB,118 outputs remain in high-impedance until VCC stabilizes, preventing bus contention - a critical feature for modular backplane systems where cards are replaced without powering down the chassis.
What is the function of pins 1 and 19 on the 74ABT240DB,118?
Pins 1 and 19 on the 74ABT240DB,118 are the active-low output enable inputs 1OE and 2OE, respectively. Each controls one group of four 3-state outputs: 1OE enables/disables outputs 1Y0–1Y3 (pins 18,16,14,12), while 2OE controls 2Y0–2Y3 (pins 9,7,5,3). When either OE pin is HIGH, its associated outputs enter high-impedance state regardless of input logic levels - enabling bidirectional bus sharing in the 74ABT240DB,118.
How does the 74ABT240DB,118 differ from standard 74LS240 devices?
The 74ABT240DB,118 delivers significantly higher performance than 74LS240: 3.1 ns typical propagation delay versus ~15 ns, ±64mA/–32mA output drive versus ±8mA, and BiCMOS power efficiency versus bipolar saturation. Unlike 74LS240, the 74ABT240DB,118 includes latch-up immunity >500 mA and 2000 V HBM ESD protection - making it suitable for modern industrial environments where the legacy 74LS240 would fail prematurely.
Is the 74ABT240DB,118 pin-compatible with other 20-pin 74-series octal buffers?
Yes, the 74ABT240DB,118 follows the industry-standard 20-pin DIP/SO/SSOP pinout for octal inverting buffers (e.g., 74LS240, 74HC240), including identical pin assignments for VCC (20), GND (10), input groups (2,4,6,8 and 11,13,15,17), output groups (18,16,14,12 and 9,7,5,3), and OEs (1,19). This allows direct PCB footprint reuse when upgrading from LS or HC variants to the 74ABT240DB,118 - provided voltage and timing margins are verified.
74ABT240DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-SSOP
74ABT240DB,118 FAQ
1.How can I place an order for 74ABT240DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT240DB,118 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 74ABT240DB,118 reliable?
The price and inventory of 74ABT240DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT240DB,118 is usually 5 days.
3.What payment methods are accepted for 74ABT240DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT240DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT240DB,118?
74ABT240DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT240DB,118 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 74ABT240DB,118?
For technical support, including 74ABT240DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT240DB,118 requirements.
6.How does Aetrix verify that 74ABT240DB,118 is sourced from the original manufacturer or authorized distributors?
All 74ABT240DB,118 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 74ABT240DB,118 meets industry standards.
7.What is the process for return or replacement of 74ABT240DB,118?
All 74ABT240DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT240DB,118, 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 74ABT240DB,118 part is unused and in its original packaging.
Return procedure for 74ABT240DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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