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Nexperia USA Inc. 74AHCT240D,118
- Part No.:
- 74AHCT240D,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AHCT240D,118.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,681
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Product details
Overview
74AHCT240D,118 from Nexperia is an octal inverting 3-state buffer/line driver with dual independent output-enable controls (1OE, 2OE), operating at 4.5–5.5 V supply, delivering 8.0 mA output drive, 3.94 V VOH (min) at 5 V, and propagation delay as low as 3.0 ns (typ) under 15 pF load. It serves as a level-translating bus interface in industrial control backplanes requiring voltage-tolerant inputs and high-impedance isolation.
For engineers reviewing the 74AHCT240D,118 datasheet, 74AHCT240D,118 pinout, 74AHCT240D,118 application, or 74AHCT240D,118 equivalent, this device is selected for bidirectional bus buffering, mixed-voltage signal translation (inputs tolerate >VCC), and noise-immune digital interfacing where Schmitt-trigger inputs and TTL-compatible thresholds are required.
Technical Context
The 74AHCT240D,118 implements two independent 4-bit inverting buffer sections, each controlled by its own active-low output enable (1OE for Y0–Y3, 2OE for Y0'–Y3'). Its Schmitt-trigger inputs provide hysteresis (≥0.5 V typical) to reject noise on slow-rising signals, while overvoltage-tolerant inputs accept up to 7.0 V regardless of VCC.
It operates within -40 °C to +125 °C ambient range, supports dynamic loading up to 50 pF, and features matched propagation delays (tpd tPLH ≈ tPHL) and fast enable/disable timing (ten ≤ 9.5 ns, tdis ≤ 11.5 ns at 50 pF), enabling synchronous bus arbitration in real-time embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 4.5–5.5 V - Ensures compatibility with standard 5 V logic rails and tolerates ±10% regulation variation. |
| VOH (min) | 3.70 V at IO = -8.0 mA, VCC = 4.5 V - Guarantees robust HIGH-level drive into TTL or CMOS loads under worst-case conditions. |
| VOL (max) | 0.55 V at IO = 8.0 mA, VCC = 4.5 V - Maintains valid LOW-level margin across full temperature and load range. |
| tpd (max) | 8.5 ns at CL = 15 pF, -40 °C to +125 °C - Enables reliable operation in 100+ MHz bus environments with setup/hold margin. |
| Input Voltage Range | -0.5 V to +7.0 V - Allows safe interfacing with 3.3 V, 5 V, or 6 V sources without external level shifters. |
| ESD Rating | HBM > 2000 V, CDM > 1000 V - Meets industrial IEC 61000-4-2 immunity requirements without added protection circuitry. |
| Operating Temp | -40 °C to +125 °C - Qualified for under-hood, motor drive, and industrial PLC applications without derating. |
Pinout & Package
74AHCT240D,118 uses the SO20 (SOT163-1) package: plastic small outline, 20-pin, 7.5 mm body width, gull-wing leads, JEDEC MS-013 compliant. Pin 1 index located at top-left corner with notch or dot marking.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enables - Independently place first or second 4-bit output group into high-impedance state for bus sharing. |
| 2, 4, 6, 8 | 1A0–1A3 | Inverting input group A - Drives outputs 1Y0–1Y3 with polarity inversion; accepts overvoltage inputs. |
| 17, 15, 13, 11 | 2A0–2A3 | Inverting input group B - Drives outputs 2Y0–2Y3; electrically isolated from group A except shared VCC/GND. |
| 18, 16, 14, 12 | 1Y0–1Y3 | Inverted outputs for group A - Tri-state capable; sink/source up to 8 mA; VOL/VOH specified at full drive. |
| 3, 5, 7, 9 | 2Y0–2Y3 | Inverted outputs for group B - Matched timing and drive strength to group A outputs for synchronized bus control. |
| 10 | GND | Reference ground - Must be low-inductance connection to minimize switching noise coupling into logic thresholds. |
| 20 | VCC | Power supply - Requires local 100 nF ceramic decoupling adjacent to pin to suppress transient current spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | Separate 1OE and 2OE pins allow selective disabling of either 4-bit section-enabling flexible bus partitioning without external logic. |
| Schmitt-trigger inputs | Input hysteresis ≥0.5 V ensures clean signal regeneration on noisy or slow-rising lines (e.g., mechanical switch debouncing, long traces). |
| Overvoltage-tolerant inputs | Accepts up to +7.0 V regardless of VCC - eliminates need for external clamping diodes when interfacing with higher-voltage peripherals. |
| TTL-compatible input thresholds | VIH(min) = 2.0 V, VIL(max) = 0.8 V at VCC = 4.5–5.5 V - Directly interfaces with legacy TTL outputs without level-shifting components. |
| High-temperature operation | Full functionality guaranteed from -40 °C to +125 °C - qualified per AEC-Q100 stress test conditions for industrial reliability. |
Applications
| Industrial Backplane Buffering | Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Isolating and driving parallel address/data buses between multiple MCU modules in a modular PLC rack. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled data flow and bus contention prevention via OE control. Use Value: Dual OE pins allow independent gating of upper/lower nibbles, reducing bus arbitration latency versus single-enable alternatives. |
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 microcontroller to drive 16-segment LED displays and keypad scan matrix. IC Role / Device Role / Timing Role: Level-translating buffer translating 3.3 V MCU outputs to 5 V display drivers while rejecting EMI-induced glitches. Use Value: Schmitt-trigger inputs suppress contact bounce and trace noise; overvoltage tolerance prevents damage during hot-plug events. |
| Legacy System Interface Adapter | Test Equipment Signal Conditioning |
|
Use Scenario: Interfacing modern FPGA-based test controllers with vintage 5 V TTL instrumentation via ribbon-cable backplanes. IC Role / Device Role / Timing Role: Bidirectional bus driver with precise 3-state timing (tdis ≤ 11.5 ns) ensuring glitch-free bus handoff. Use Value: Matched tpd/tens/tend specs guarantee deterministic timing margins in synchronous handshake protocols like IEEE-488. |
Use Scenario: Conditioning digital trigger and clock signals in automated test equipment before routing to high-speed ADC/DAC modules. IC Role / Device Role / Timing Role: Noise-immune signal repeater with hysteresis and low-propagation skew (<0.5 ns max deviation between channels). Use Value: Balanced propagation delays across all 8 channels eliminate inter-channel timing skew that would distort multi-bit waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHCT240PW,118 | TSSOP20 package (4.4 mm width); 10.0 mW/K thermal derating above 100 °C vs. SO20's 12.3 mW/K above 109 °C. | Better PCB area efficiency but lower thermal mass - preferred for space-constrained portable test gear, not high-power industrial enclosures. | Select when board space is critical and ambient stays below 100 °C; verify solder profile compatibility with fine-pitch gull-wings. |
| SN74AHCT240N | SOIC-20 from Texas Instruments; identical logic function and DC specs, but VOH/VOL min/max differ by ±0.05 V at 8 mA. | Same pinout and footprint; validated in TI's automotive-grade qualification program (AEC-Q100 Grade 2), unlike Nexperia's industrial-only rating. | Choose for automotive-qualified designs requiring formal PPAP documentation; otherwise, electrical interoperability is assured. |
Compared with 74AHCT240PW,118, the D-package offers superior thermal dissipation in sustained 50 pF loading scenarios; compared with SN74AHCT240N, it provides tighter VOH consistency at high temperature but lacks formal automotive qualification evidence.
Availability
74AHCT240D,118 is available at Aetrix Electronics and suitable for industrial backplane buffering, microcontroller bus expansion, legacy system interface adaptation, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for 74AHCT240D,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
Nexperia is a global semiconductor expert headquartered in Nijmegen, Netherlands, specializing in high-volume logic, discrete, and MOSFET solutions with emphasis on reliability, efficiency, and manufacturability.
The 74AHCT series targets industrial and consumer applications demanding TTL-compatible inputs, wide supply tolerance, and robust ESD performance - optimized for cost-sensitive, high-reliability digital interfacing.
FAQ
Can 74AHCT240D,118 operate with a 3.3 V supply?
No. The 74AHCT240D,118 is specified only for 4.5–5.5 V operation per Table 5. At 3.3 V, VIH threshold (2.0 V min) becomes marginal, VOH drops below 2.4 V, and propagation delay exceeds 15 ns - violating functional and timing guarantees. Use 74LVC240 for 3.3 V systems.
What is the maximum capacitive load this device can drive reliably?
The datasheet specifies dynamic characteristics up to 50 pF (Table 7). Driving >50 pF increases tpd and tdis beyond guaranteed limits and may cause overshoot/ringing due to output impedance mismatch. For 100 pF loads, add series termination (22–33 Ω) at the driver output.
Is the GND pad on the DHVQFN package (BQ variant) required to be soldered?
No. Per SOT764-1 mechanical drawing, the exposed thermal pad (terminal 1) has no electrical function and may remain unsoldered. If soldered, it must be left floating or connected to GND - never tied to VCC or left unconnected with solder bridging.
How does the Schmitt-trigger input improve noise immunity compared to standard CMOS inputs?
Its input hysteresis (typically ≥0.5 V) creates separate VIH and VIL thresholds - e.g., VIH = 2.0 V, VIL = 1.5 V - so noise spikes <0.5 V cannot cause false toggling. This rejects EMI on long cables or switch bounce without external RC filtering, unlike non-hysteresis buffers.
74AHCT240D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74AHCT240D,118 FAQ
1.How can I place an order for 74AHCT240D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT240D,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 74AHCT240D,118 reliable?
The price and inventory of 74AHCT240D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT240D,118 is usually 5 days.
3.What payment methods are accepted for 74AHCT240D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT240D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT240D,118?
74AHCT240D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT240D,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 74AHCT240D,118?
For technical support, including 74AHCT240D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT240D,118 requirements.
6.How does Aetrix verify that 74AHCT240D,118 is sourced from the original manufacturer or authorized distributors?
All 74AHCT240D,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 74AHCT240D,118 meets industry standards.
7.What is the process for return or replacement of 74AHCT240D,118?
All 74AHCT240D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT240D,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 74AHCT240D,118 part is unused and in its original packaging.
Return procedure for 74AHCT240D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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