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Nexperia USA Inc. 74AHCT240BQ-Q100X
- Part No.:
- 74AHCT240BQ-Q100X
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74AHCT240BQ-Q100X.pdf
- Description:
- IC BUFFER INVERT 5.5V 20DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,369
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Product details
Overview
74AHCT240BQ-Q100 from Nexperia is an automotive-grade octal inverting buffer/line driver with 3-state outputs, dual independent output enables (1OE, 2OE), Schmitt-trigger inputs, and overvoltage-tolerant inputs up to 5.5 V. It operates from 4.5 V to 5.5 V across –40 °C to +125 °C and supports mixed-voltage translation in engine control units and ADAS domain controllers.
For engineers reviewing the 74AHCT240BQ-Q100 datasheet, 74AHCT240BQ-Q100 pinout, 74AHCT240BQ-Q100 application, or 74AHCT240BQ-Q100 equivalent, this device is selected for high-noise automotive signal buffering where fast enable/disable timing, rail-to-rail input tolerance, and AEC-Q100 Grade 1 qualification are mandatory.
Technical Context
This device implements two independent 4-bit inverting buffers, each controlled by its own active-low output enable (1OE for Y0–Y3, 2OE for Y0–Y3 of second group). All eight inputs feature Schmitt-trigger action for noise immunity on slow or noisy signals.
Input voltage tolerance exceeds VCC (up to 5.5 V) while operating at 5 V nominal supply, enabling direct interfacing with 3.3 V or 5 V logic domains without level shifters. Propagation delay is 3.0 ns typical (CL = 15 pF) and disable time is 6.2 ns typical - critical for synchronized bus isolation in CAN/FlexRay gateway modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting buffer with 3-state outputs; enables bidirectional bus isolation via dual OE control |
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation under automotive battery transients (e.g., load dump, cold crank) |
| Operating Temperature | –40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for powertrain and chassis ECUs |
| Propagation Delay | 3.0 ns typical (VCC = 5 V, CL = 15 pF) - supports >100 MHz bus toggle rates in diagnostic interfaces |
| Input Voltage Range | 0 V to 5.5 V - allows safe interfacing with 3.3 V microcontrollers driving 5 V bus segments |
| Output Drive | ±8 mA (VOH/VOL @ 3.94 V / 0.36 V) - sufficient to drive 50 Ω transmission lines or multiple TTL loads |
| ESD Protection | HBM >2000 V, CDM >1000 V - meets automotive ESD robustness requirements for under-hood placement |
Pinout & Package
DHVQFN20 package (SOT764-1): 2.5 × 4.5 × 0.85 mm body, side-wettable flanks for AOI-compatible solder joint inspection, thermal-enhanced construction for sustained 125 °C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - independently disable first four (1Y0–1Y3) or last four (2Y0–2Y3) outputs |
| 2, 4, 6, 8 | 1A0–1A3 | Inverting data inputs for first buffer group - Schmitt-triggered for noise rejection on long harness traces |
| 17, 15, 13, 11 | 2A0–2A3 | Inverting data inputs for second buffer group - electrically isolated from Group 1 for dual-bus routing |
| 18, 16, 14, 12 | 1Y0–1Y3 | Inverted, 3-state outputs for Group 1 - high-impedance when 1OE = HIGH, prevents bus contention |
| 3, 5, 7, 9 | 2Y0–2Y3 | Inverted, 3-state outputs for Group 2 - independently controllable for time-multiplexed sensor data routing |
| 10 | GND | Ground reference (0 V) - dedicated low-inductance return path for switching noise suppression |
| 20 | VCC | 5 V power supply - decoupling required within 3 mm for <100 ps edge integrity in ECU clock domains |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for continuous operation from –40 °C to +125 °C in engine bay and transmission control modules |
| Dual independent 3-state enables | Enables selective isolation of two 4-bit data lanes - essential for multiplexed LIN/CAN message routing |
| Overvoltage-tolerant inputs | Accepts 0–5.5 V regardless of VCC = 5 V - eliminates external level shifters when interfacing with 3.3 V MCUs |
| Schmitt-trigger inputs | Hysteresis >0.5 V - rejects EMI-induced glitches on 2+ meter wiring harnesses in vehicle networks |
| DHVQFN20 with side-wettable flanks | Enables automated optical inspection of solder joints - critical for zero-defect manufacturing in Tier-1 production |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Buffering crankshaft/camshaft position sensor signals before ADC sampling in real-time combustion control loops. IC Role / Device Role / Timing Role: Inverting signal conditioner with 3-state isolation during diagnostic mode to prevent backfeeding into sensor circuits. Use Value: Schmitt-trigger inputs reject ignition coil RFI; 3.0 ns propagation delay preserves sub-degree timing resolution for misfire detection. |
Use Scenario: Level-shifting and isolating camera module pixel clock and frame sync signals in surround-view systems. IC Role / Device Role / Timing Role: Voltage-tolerant buffer translating 3.3 V FPGA outputs to 5 V image sensor interface while enabling bus contention avoidance. Use Value: 5.5 V input tolerance eliminates discrete level shifters; dual OE allows synchronized blanking of multiple camera streams. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
|
Use Scenario: Driving multiplexed LED headlight arrays and interior lighting buses with PWM dimming control. IC Role / Device Role / Timing Role: High-current inverting driver with 3-state capability to disconnect loads during fault conditions or sleep mode. Use Value: ±8 mA drive sustains 20 mA LED strings; disable time <7 ns ensures clean PWM edge transitions without ghost illumination. |
Use Scenario: Isolating torque sensor analog front-end signals from MCU ADC inputs during motor phase commutation noise events. IC Role / Device Role / Timing Role: Noise-immune buffer with fast enable/disable to gate sensor data only during low-noise sampling windows. Use Value: Balanced tPLH/tPHL delays (<0.5 ns skew) preserve differential sensor timing; HBM >2 kV withstands EPS motor EMI bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT240QPWRQ1 | TSSOP20 package (SOT360-1); 4.4 mm body width; no side-wettable flanks | Lacks AOI-compatible solder joint inspection; lower thermal dissipation margin at 125 °C | Preferred for space-constrained PCBs where AOI is not mandated and thermal load is moderate |
| 74LVC240APW-Q100 | Lower VCC range (1.65–3.6 V); non-inverting logic; 3.6 V max input tolerance | Not suitable for 5 V bus translation or AEC-Q100 Grade 1 at 125 °C (rated to 105 °C only) | Select only for 3.3 V-only domains requiring lower static current; not a drop-in replacement |
Compared with SN74AHCT240QPWRQ1, the 74AHCT240BQ-Q100 offers superior manufacturability via side-wettable flanks and higher thermal performance; versus 74LVC240APW-Q100, it provides full 5 V system compatibility and extended temperature support essential for powertrain use.
Availability
74AHCT240BQ-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, and electric power steering systems requiring stable component supply under AEC-Q100 compliance.
Supply support for 74AHCT240BQ-Q100 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 delivering high-performance logic, discrete, and MOSFET solutions optimized for automotive, industrial, and consumer applications.
The 74AHCT series targets automotive signal integrity - designed specifically for noise-immune buffering, level translation, and bus isolation in harsh ECU environments.
FAQ
Is the 74AHCT240BQ-Q100 pin-compatible with standard 74HC240 or 74LS240 devices?
No. While functionally similar as an octal inverting buffer, the 74AHCT240BQ-Q100 uses DHVQFN20 packaging (SOT764-1) with unique pin mapping - e.g., GND at Pin 10 and VCC at Pin 20 - differing from SO20 or TSSOP20 footprints. Direct PCB replacement requires layout revision.
Can the 74AHCT240BQ-Q100 safely interface a 3.3 V FPGA with a 5 V sensor bus?
Yes. Its inputs tolerate up to 5.5 V regardless of VCC = 5 V, allowing direct connection of 3.3 V FPGA outputs without level shifters. The device's TTL-compatible input thresholds (VIH = 2.0 V min) ensure reliable recognition of 3.3 V logic HIGHs.
What is the maximum capacitive load the 74AHCT240BQ-Q100 can drive while maintaining specified timing?
The datasheet specifies timing parameters up to 50 pF load capacitance. At CL = 50 pF, propagation delay is 4.4 ns typical and disable time is 6.2 ns typical. Exceeding 50 pF increases delay nonlinearly and may violate setup/hold margins in high-speed interfaces.
Does the exposed thermal pad on the DHVQFN20 package require electrical connection?
No. The exposed pad (Pin 1 index area) has no electrical function. It may remain floating or be connected to GND for thermal enhancement, but soldering it is optional and imposes no electrical requirement - per Nexperia's datasheet note (Section 5.1).
74AHCT240BQ-Q100X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHCT
- Package/Case:
- 20-VFQFN Exposed Pad
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DHVQFN (4.5x2.5)
74AHCT240BQ-Q100X FAQ
1.How can I place an order for 74AHCT240BQ-Q100X through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT240BQ-Q100X 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 74AHCT240BQ-Q100X reliable?
The price and inventory of 74AHCT240BQ-Q100X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT240BQ-Q100X is usually 5 days.
3.What payment methods are accepted for 74AHCT240BQ-Q100X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT240BQ-Q100X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT240BQ-Q100X?
74AHCT240BQ-Q100X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT240BQ-Q100X 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 74AHCT240BQ-Q100X?
For technical support, including 74AHCT240BQ-Q100X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT240BQ-Q100X requirements.
6.How does Aetrix verify that 74AHCT240BQ-Q100X is sourced from the original manufacturer or authorized distributors?
All 74AHCT240BQ-Q100X 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 74AHCT240BQ-Q100X meets industry standards.
7.What is the process for return or replacement of 74AHCT240BQ-Q100X?
All 74AHCT240BQ-Q100X units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT240BQ-Q100X, 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 74AHCT240BQ-Q100X part is unused and in its original packaging.
Return procedure for 74AHCT240BQ-Q100X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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