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NXP Semiconductors 74AHC240D,118
- Part No.:
- 74AHC240D,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AHC240D,118.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,910
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Product details
Overview
74AHC240D,118 from NXP Semiconductors is an 8-bit inverting buffer/line driver with dual 3-state outputs and CMOS-level input compatibility. It operates across 2.0 V to 5.5 V supply, supports −40 °C to +125 °C ambient range, features Schmitt-trigger inputs, overvoltage-tolerant inputs up to 7.0 V, and delivers propagation delays as low as 2.8 ns (VCC = 4.5–5.5 V, CL = 15 pF). It is used in bidirectional bus interfacing and voltage-level translation between mixed-supply subsystems.
For engineers reviewing the 74AHC240D,118 datasheet, 74AHC240D,118 pinout, 74AHC240D,118 application, or 74AHC240D,118 equivalent, key selection criteria include its dual independent output-enable control (1OE/2OE), 20-pin SO20 package with 7.5 mm body width, guaranteed operation at extended temperature, and compatibility with both 3.3 V and 5 V logic domains without level-shifting circuitry.
Technical Context
The 74AHC240D,118 implements two independent 4-bit inverting buffer sections, each controlled by a dedicated active-low output enable (1OE for Y0–Y3, 2OE for Y0'–Y3'). Its Schmitt-trigger inputs provide noise immunity on slow-rising signals, while overvoltage tolerance (VI up to 7.0 V) enables safe interfacing with higher-voltage buses. The device uses standard CMOS input thresholds (VIH = 3.85 V min at VCC = 5.5 V).
It exhibits balanced propagation delays (tpd ≤ 7.5 ns at VCC = 3.0–3.6 V, CL = 15 pF), fast enable/disable timing (ten ≤ 12.5 ns, tdis ≤ 18.1 ns under same conditions), and low static current (ICC ≤ 80 µA at VCC = 5.5 V, −40 °C to +125 °C). All inputs and outputs are ESD-protected per HBM (>2000 V) and CDM (>1000 V) standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 5.5 V - supports direct interface with 3.3 V and 5 V logic families without external regulators |
| Operating Temperature | −40 °C to +125 °C - qualified for industrial and extended-temperature embedded applications |
| Propagation Delay | 2.8 ns (typ, VCC = 4.5–5.5 V, CL = 15 pF) - enables high-speed data buffering in timing-critical paths |
| Input Voltage Range | −0.5 V to +7.0 V - allows safe connection to 5 V buses even when powered from 3.3 V |
| Output Drive | ±8 mA (VCC = 4.5 V) - sufficient to drive standard TTL loads and moderate PCB trace capacitance |
| Power Dissipation Cap | 500 mW (Tamb = −40 °C to +125 °C) - defines thermal design margin for continuous operation |
| Input Capacitance | 10 pF max - minimizes loading on upstream drivers and preserves signal edge rates |
Pinout & Package
74AHC240D,118 is housed in a plastic small outline package (SO20) with 20 leads and 7.5 mm body width (SOT163-1). Pin 1 is index-marked; pin 10 is GND; pin 20 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low enable for first 4-bit inverting buffer (Y0–Y3) |
| 2, 4, 6, 8 | 1A0–1A3 | Inverting input pins for first buffer section |
| 3, 5, 7, 9 | 2Y0–2Y3 | Inverting output pins for second buffer section |
| 10 | GND | Ground reference (0 V) for all internal circuitry and I/O |
| 11, 13, 15, 17 | 2A0–2A3 | Inverting input pins for second buffer section |
| 12, 14, 16, 18 | 1Y0–1Y3 | Inverting output pins for first buffer section |
| 19 | 2OE | Active-low enable for second 4-bit inverting buffer (Y0'–Y3') |
| 20 | VCC | Positive supply rail (2.0–5.5 V); powers all logic and output stages |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | Separate 1OE and 2OE pins allow selective disabling of either 4-bit buffer group without affecting the other |
| Schmitt-trigger inputs | Provides hysteresis (typically 0.3–0.5 V) to reject noise on slow or noisy control lines |
| Overvoltage-tolerant inputs | Accepts up to 7.0 V regardless of VCC, enabling robust level translation from 5 V to 3.3 V systems |
| Low dynamic power | CPD = 9 pF enables predictable dynamic power calculation (PD = CPD × VCC² × fi × N) |
| Extended temperature rating | Specified from −40 °C to +125 °C ensures reliability in harsh industrial environments |
Applications
| Industrial Bus Interface | Microcontroller Peripheral Expansion |
|---|---|
Use Scenario: Isolating and driving address/data lines between a 3.3 V microcontroller and legacy 5 V peripheral bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled signal conditioning and voltage domain bridging. Use Value: Eliminates need for discrete level shifters; Schmitt-trigger inputs suppress noise on long traces; dual OE enables time-multiplexed bus sharing. | Use Scenario: Expanding GPIO count on an ARM Cortex-M4 MCU by adding buffered parallel I/O ports. IC Role / Device Role / Timing Role: Octal inverting driver delivering clean, slew-controlled outputs to external peripherals. Use Value: Provides ±8 mA drive strength per output; low propagation delay (<3 ns at 5 V) maintains timing margins; SO20 footprint simplifies layout routing. |
| Test Equipment Signal Conditioning | Programmable Logic Interface |
Use Scenario: Driving multiple DUT inputs simultaneously from a pattern generator with precise timing control. IC Role / Device Role / Timing Role: High-fanout inverting buffer with independent enable groups for synchronized stimulus delivery. Use Value: Matched propagation delays ensure simultaneous edge arrival; 3-state outputs prevent bus contention during test sequence transitions. | Use Scenario: Interfacing CPLD I/O banks operating at different voltages (e.g., 3.3 V core, 5 V I/O) to external memory or display controllers. IC Role / Device Role / Timing Role: Level-translating buffer ensuring compatible logic thresholds and drive capability across voltage domains. Use Value: Overvoltage-tolerant inputs accept 5 V signals while powered from 3.3 V; CMOS-compatible VIH/VIL guarantees reliable recognition by FPGA/CPLD inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHCT240D,118 | TTL-compatible input thresholds (VIH = 2.0 V min), fixed 4.5–5.5 V supply range | Better suited for legacy 5 V TTL systems; not recommended for 3.3 V-only designs | Select when interfacing exclusively with 5 V TTL logic and requiring guaranteed recognition of 2.0 V inputs |
| SN74LVC240APWR | Lower VCC range (1.65–3.6 V), LVTTL-compatible, smaller TSSOP20 package (SOT360-1) | Optimized for 1.8 V/2.5 V/3.3 V low-power systems; incompatible with 5 V inputs | Choose for battery-powered or space-constrained 3.3 V designs where 5 V tolerance is unnecessary |
Compared with 74AHCT240D,118 and SN74LVC240APWR, the 74AHC240D,118 uniquely supports dual-voltage operation (2.0–5.5 V) with overvoltage-tolerant inputs, making it the only option among the three capable of safely bridging 3.3 V and 5 V domains without external components.
Availability
74AHC240D,118 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and programmable logic interface applications requiring stable component supply and extended-temperature performance.
Supply support for 74AHC240D,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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74AHC240D,118 belongs to NXP's AHC logic family, designed for high-speed, low-power, mixed-voltage digital interfacing in industrial and embedded systems where robustness and wide supply range are critical.
FAQ
What is the maximum input voltage rating for 74AHC240D,118?
The 74AHC240D,118 supports an absolute maximum input voltage of +7.0 V, independent of VCC. This overvoltage tolerance allows safe connection to 5 V buses even when the device is powered from 3.3 V, eliminating the need for external clamping diodes or level shifters in mixed-voltage interfaces.
Does 74AHC240D,118 support operation at 3.3 V supply?
Yes, 74AHC240D,118 is fully specified for operation at 3.3 V (VCC = 3.0–3.6 V). At this supply, it delivers typical propagation delay of 3.9 ns (CL = 15 pF), VOH ≥ 2.9 V, VOL ≤ 0.1 V, and supports input thresholds compatible with 3.3 V CMOS logic, making it ideal for modern low-voltage embedded systems.
How does the dual output-enable feature of 74AHC240D,118 improve system design?
The 74AHC240D,118 provides two independent active-low output enables (1OE and 2OE), each controlling four outputs. This allows selective disabling of one 4-bit buffer group while keeping the other active-enabling time-multiplexed bus access, reduced power during idle periods, and simplified arbitration logic without requiring additional control ICs.
What package type is used for 74AHC240D,118?
The 74AHC240D,118 is supplied in a plastic small outline package (SO20) with 20 leads and 7.5 mm body width (SOT163-1). This industry-standard surface-mount package offers mechanical robustness, ease of rework, and compatibility with automated assembly processes used in industrial PCB manufacturing.
Is 74AHC240D,118 suitable for automotive applications?
No, the 74AHC240D,118 is not automotive-qualified. It is rated for industrial temperature range (−40 °C to +125 °C) but has not undergone AEC-Q100 qualification or automotive-specific testing. For automotive use, consult NXP's automotive-grade logic portfolio or verify qualification status directly with NXP before design-in.
74AHC240D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74AHC240D,118 FAQ
1.How can I place an order for 74AHC240D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC240D,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 74AHC240D,118 reliable?
The price and inventory of 74AHC240D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC240D,118 is usually 5 days.
3.What payment methods are accepted for 74AHC240D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHC240D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHC240D,118?
74AHC240D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC240D,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 74AHC240D,118?
For technical support, including 74AHC240D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC240D,118 requirements.
6.How does Aetrix verify that 74AHC240D,118 is sourced from the original manufacturer or authorized distributors?
All 74AHC240D,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 74AHC240D,118 meets industry standards.
7.What is the process for return or replacement of 74AHC240D,118?
All 74AHC240D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC240D,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 74AHC240D,118 part is unused and in its original packaging.
Return procedure for 74AHC240D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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