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Nexperia USA Inc. 74AHCT240BQ,115
- Part No.:
- 74AHCT240BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74AHCT240BQ,115.pdf
- Description:
- IC BUFFER INVERT 5.5V 20DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,960
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Product details
Overview
74AHCT240BQ,115 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 8.5 ns max propagation delay at 125 °C and ±8 mA output drive. It supports mixed-voltage translation via overvoltage-tolerant inputs and is rated for industrial-extended temperature range (−40 °C to +125 °C). This device serves as a bidirectional bus interface or address/data line driver in microcontroller peripheral expansion systems.
For engineers reviewing the 74AHCT240BQ,115 datasheet, 74AHCT240BQ,115 pinout, 74AHCT240BQ,115 application, or 74AHCT240BQ,115 equivalent, key selection criteria include its dual 4-bit 3-state control architecture, Schmitt-trigger input hysteresis, TTL-compatible input thresholds, thermal-enhanced DHVQFN20 package, and guaranteed high-impedance isolation during enable assertion.
Technical Context
The 74AHCT240BQ implements two independent 4-bit inverting buffer sections, each controlled by a dedicated active-low output-enable input (1OE for Y0–Y3, 2OE for Y0–Y3 of second group). Its logic function strictly follows the truth table: when nOE = LOW, nYn = NOT(nAn); when nOE = HIGH, nYn = high-impedance.
All eight inputs feature Schmitt-trigger action with 0.8 V typical hysteresis, enabling robust noise immunity on slow-rising or noisy control lines. Input voltage tolerance up to 7.0 V allows safe interfacing with 3.3 V, 5 V, or legacy 3.3/5 V mixed-bus systems without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5–5.5 V - Ensures compatibility with standard 5 V TTL and CMOS logic rails while maintaining noise margin. |
| Propagation Delay (tpd) | Max 8.5 ns at VCC = 4.5–5.5 V, CL = 15 pF, −40 °C to +125 °C - Supports >100 MHz bus toggle rates in synchronous interfaces. |
| Output Drive (IO) | ±8.0 mA - Sufficient to drive 50 Ω transmission lines or fan-out to ≥10 LS-TTL loads. |
| Input Voltage Range (VI) | −0.5 to +7.0 V - Enables direct connection to higher-voltage control signals without external clamping. |
| Operating Temperature | −40 °C to +125 °C - Qualified for under-hood automotive modules, industrial PLC I/O, and high-ambient embedded controllers. |
| ESD Protection | HBM >2000 V, CDM >1000 V - Reduces need for external ESD protection in board-level designs. |
| Power Dissipation (Ptot) | 500 mW at Tamb ≤ 111 °C (DHVQFN20) - Thermal design accommodates sustained operation in compact enclosures. |
Pinout & Package
DHVQFN20 package (SOT764-1): 2.5 × 4.5 × 0.85 mm body, no leads, thermally enhanced exposed pad (GND-connected or floating per layout guidance), 20-terminal quad flat configuration with terminal 1 index area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1Y3 | Inverted output of first group, bit 3 - Drives downstream load only when 1OE = LOW. |
| 2 | 1A3 | Data input for first group, bit 3 - Accepts overvoltage-tolerant signal up to 7.0 V. |
| 3 | 2Y3 | Inverted output of second group, bit 3 - Independent enable control via 2OE. |
| 4 | 2A2 | Data input for second group, bit 2 - Schmitt-trigger input ensures clean switching on noisy lines. |
| 5 | 2Y2 | Inverted output of second group, bit 2 - High-impedance state isolates bus when 2OE = HIGH. |
| 6 | 1Y2 | Inverted output of first group, bit 2 - Dual-group architecture enables flexible 4+4 or 8-bit bus partitioning. |
| 7 | 1A2 | Data input for first group, bit 2 - TTL-compatible threshold (VIH = 2.0 V min) simplifies integration. |
| 8 | 2A1 | Data input for second group, bit 1 - Shared VCC/GND pins reduce power rail inductance in high-speed routing. |
| 9 | 2Y1 | Inverted output of second group, bit 1 - Propagation delay matched across all outputs (±0.5 ns typical). |
| 10 | 1Y1 | Inverted output of first group, bit 1 - GND terminal (pin 10) is electrically isolated from thermal pad unless explicitly connected. |
| 11 | 1A1 | Data input for first group, bit 1 - Input leakage <2.0 μA at 125 °C ensures low standby current in battery-backed systems. |
| 12 | 2A0 | Data input for second group, bit 0 - Enables independent enable/disable of two 4-bit data lanes. |
| 13 | 2Y0 | Inverted output of second group, bit 0 - Disable time (tdis) ≤11.5 ns ensures fast bus release for time-critical arbitration. |
| 14 | 1Y0 | Inverted output of first group, bit 0 - Enable time (ten) ≤14.4 ns supports rapid bus turnaround in half-duplex protocols. |
| 15 | 1A0 | Data input for first group, bit 0 - Pin 15 is electrically identical to other A-inputs; no special biasing required. |
| 16 | 2OE | Active-low enable for second group outputs (2Y0–2Y3) - Asserting HIGH places all four outputs in high-Z. |
| 17 | GND | Ground reference (0 V) - Pin 10 is designated GND; thermal pad may be left floating or tied to GND per layout rules. |
| 18 | 2A3 | Data input for second group, bit 3 - Input capacitance CI ≤10 pF minimizes loading on driving source. |
| 19 | 1OE | Active-low enable for first group outputs (1Y0–1Y3) - Independent control enables staggered bus access. |
| 20 | VCC | Positive supply (4.5–5.5 V) - Decoupling capacitor (100 nF) recommended within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit 3-state control | Enables selective bus isolation: one group can drive while the other remains high-Z, reducing contention in multi-master systems. |
| Schmitt-trigger inputs | Provides ≥0.8 V hysteresis to reject noise on slow edges-critical for reset, enable, or manual control lines. |
| Overvoltage-tolerant inputs (up to 7.0 V) | Eliminates need for external level translators when interfacing 3.3 V microcontrollers to 5 V peripherals. |
| Guaranteed operation to +125 °C | Validated performance across full industrial-extended range supports deployment in motor drives and power supplies. |
| Thermally enhanced DHVQFN20 package | 0.85 mm profile and exposed pad improve heat dissipation-enables higher sustained output current vs. SO20/TSSOP. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Address Bus Buffering |
|---|---|
|
Use Scenario: Isolating and driving 8-bit parallel I/O lines between a programmable logic controller CPU and field-mounted digital input/output modules. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing bidirectional signal conditioning, with 1OE/2OE enabling dynamic bus arbitration between master and slave modules. Use Value: Dual enable control allows interleaved read/write cycles without bus contention; ±8 mA drive sustains signal integrity over 30 cm PCB traces. |
Use Scenario: Expanding the address/data multiplexed bus of an ARM Cortex-M7 MCU to interface with external SRAM and FPGA configuration memory. IC Role / Device Role / Timing Role: Octal inverting buffer decoupling high-capacitance address lines from the MCU, with precise 8.5 ns max tpd ensuring setup/hold timing compliance at 80 MHz. Use Value: Schmitt-trigger inputs suppress ringing on long traces; overvoltage tolerance permits direct connection to 5 V FPGA I/O banks. |
| Automotive Body Control Module | Legacy Instrument Cluster Interface |
|
Use Scenario: Driving segmented LED displays and relay drivers in a vehicle body control unit operating in under-dash environments up to +105 °C ambient. IC Role / Device Role / Timing Role: Level-translating buffer translating 3.3 V microcontroller GPIO to 5 V display segment drivers, leveraging input overvoltage tolerance and 125 °C rating. Use Value: HBM >2000 V ESD rating reduces field failure risk in service bay handling; DHVQFN20 package withstands thermal cycling stress. |
Use Scenario: Interfacing a modern low-power MCU to legacy 5 V LCD character displays and keypad scanners in automotive instrument clusters. IC Role / Device Role / Timing Role: Inverting 3-state line driver enabling shared data bus between MCU and multiple legacy peripherals using software-controlled 1OE/2OE sequencing. Use Value: Dual enable architecture eliminates need for external bus switches; guaranteed VOL ≤0.55 V ensures reliable LOW detection at 5 V logic thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC240APW,118 | Lower VCC range (1.65–3.6 V), 3.3 V only; 5.5 ns max tpd at 3.3 V; no overvoltage tolerance. | Restricted to 3.3 V-only systems; unsuitable for mixed-voltage or 5 V legacy interfaces. | Select when system operates exclusively at 3.3 V and requires lower static current (<1 μA ICC). |
| SN74AHCT240N | DIP-20 package; same electrical specs but larger footprint and higher thermal resistance (θJA = 70 °C/W vs. 42 °C/W for BQ). | Preferred for prototyping or through-hole assembly; not suitable for space-constrained or thermally demanding layouts. | Choose for breadboard evaluation or legacy DIP-based designs where reflow compatibility is not required. |
Compared with 74LVC240APW,118 and SN74AHCT240N, the 74AHCT240BQ,115 uniquely combines 5 V operation, overvoltage-tolerant inputs, and thermally optimized DHVQFN20 packaging-making it optimal for industrial and automotive mixed-signal bus interfaces requiring reliability, density, and voltage flexibility.
Availability
74AHCT240BQ,115 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller address bus buffering, automotive body control modules, and legacy instrument cluster interfaces requiring stable component supply across extended temperature and mixed-voltage conditions.
Supply support for 74AHCT240BQ,115 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 focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74AHCT series targets industrial-grade 5 V logic interoperability, emphasizing robustness, wide temperature operation, and mixed-voltage interface capability-designed specifically for reliable signal conditioning in harsh or legacy-system environments.
FAQ
Can the 74AHCT240BQ,115 operate with a 3.3 V supply?
No. The 74AHCT240BQ,115 is specified only for 4.5–5.5 V operation per Table 5. At 3.3 V, VIH minimum (2.0 V) is met, but VOH and VOL parameters fall outside specification, and propagation delay increases significantly. Use 74LVC240 for 3.3 V systems.
Is the thermal pad (exposed die attach pad) required to be soldered to ground?
No. Per datasheet section 5.1, the thermal pad has no electrical requirement. It may remain floating or be connected to GND-however, if connected, the solder land must be either fully floating or tied directly to GND plane with multiple vias; partial connections cause thermal and electrical instability.
What is the maximum capacitive load the 74AHCT240BQ,115 can drive reliably?
The device is characterized up to 50 pF (Table 7), with propagation delay increasing linearly beyond that. For reliable timing at 125 °C, keep total load ≤40 pF including trace and input capacitance. Exceeding 50 pF risks violating setup/hold margins in high-speed synchronous buses.
Do both output-enable inputs (1OE and 2OE) need to be asserted simultaneously to disable all outputs?
No. Each output-enable controls four outputs independently: asserting 1OE = HIGH disables 1Y0–1Y3; asserting 2OE = HIGH disables 2Y0–2Y3. All eight outputs enter high-Z only when both 1OE and 2OE are HIGH-enabling partial bus isolation for time-multiplexed access.
74AHCT240BQ,115 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DHVQFN (4.5x2.5)
74AHCT240BQ,115 FAQ
1.How can I place an order for 74AHCT240BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT240BQ,115 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,115 reliable?
The price and inventory of 74AHCT240BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT240BQ,115 is usually 5 days.
3.What payment methods are accepted for 74AHCT240BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT240BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT240BQ,115?
74AHCT240BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT240BQ,115 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,115?
For technical support, including 74AHCT240BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT240BQ,115 requirements.
6.How does Aetrix verify that 74AHCT240BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74AHCT240BQ,115 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,115 meets industry standards.
7.What is the process for return or replacement of 74AHCT240BQ,115?
All 74AHCT240BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT240BQ,115, 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,115 part is unused and in its original packaging.
Return procedure for 74AHCT240BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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