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NXP Semiconductors 74AHC240BQ,115
- Part No.:
- 74AHC240BQ,115
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74AHC240BQ,115.pdf
- Description:
- IC BUFFER INVERT 5.5V 20DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,887
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Product details
Overview
74AHC240BQ,115 from NXP Semiconductors is an 8-bit inverting buffer/line driver with dual 3-state output enables (1OE and 2OE), operating from 2.0 V to 5.5 V supply, featuring overvoltage-tolerant inputs up to 7.0 V and Schmitt-trigger input action. It supports mixed-voltage translation between 3.3 V and 5 V domains and is rated for −40 °C to +125 °C operation in the DHVQFN20 package.
For engineers reviewing the 74AHC240BQ,115 datasheet, 74AHC240BQ,115 pinout, 74AHC240BQ,115 application, or 74AHC240BQ,115 equivalent, this device serves as a high-speed, low-power octal inverting buffer for bus isolation, address/data buffering, and level-shifting in industrial control, instrumentation, and embedded logic systems.
Technical Context
The 74AHC240BQ,115 implements two independent 4-bit inverting buffer sections, each controlled by its own active-low output enable (1OE for outputs Y0–Y3; 2OE for Y0–Y3 of second group). Its CMOS input thresholds (VIH = 1.5 V at VCC = 2.0 V; VIL = 0.5 V) ensure compatibility with standard AHC logic families.
Each output delivers ±8 mA drive capability at VCC = 4.5 V with propagation delays as low as 2.8 ns (typical, CL = 15 pF), and disable times under 6.5 ns (typical, VCC = 4.5 V). Input clamping current exceeds ±20 mA, and ESD protection meets HBM >2000 V and CDM >1000 V per JESD22 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting buffer with 3-state outputs; enables bidirectional bus isolation via two independent OE controls. |
| Supply Voltage Range | 2.0 V to 5.5 V - supports both 3.3 V and 5 V system rails without level shifters. |
| Input Voltage Tolerance | −0.5 V to +7.0 V - allows safe interfacing with higher-voltage signals in mixed-supply systems. |
| Propagation Delay | 2.8 ns (typical, VCC = 4.5 V, CL = 15 pF) - ensures timing-critical signal integrity in high-speed digital interfaces. |
| Output Drive Strength | ±8.0 mA (VOL ≤ 0.55 V, VOH ≥ 3.70 V at VCC = 4.5 V) - sufficient to drive 50 pF loads across temperature range. |
| Operating Temperature | −40 °C to +125 °C - qualified for extended industrial and under-hood applications. |
| ESD Protection | HBM >2000 V, CDM >1000 V - robust handling during PCB assembly and field operation. |
Pinout & Package
DHVQFN20 package: plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads; 20 terminals; body dimensions 2.5 × 4.5 × 0.85 mm (SOT764-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low enable for first 4 outputs (1Y0–1Y3); asserts high-impedance state when HIGH. |
| 2, 4, 6, 8 | 1A0–1A3 | Inverting data inputs for first buffer group; Schmitt-trigger inputs improve noise immunity. |
| 3, 5, 7, 9 | 2Y0–2Y3 | Inverting outputs for second buffer group; 3-state capable with independent 2OE control. |
| 10 | GND | Ground reference (0 V); required for stable logic thresholds and power return path. |
| 11, 13, 15, 17 | 2A0–2A3 | Inverting data inputs for second buffer group; tolerant to VI up to +7.0 V. |
| 12, 14, 16, 18 | 1Y0–1Y3 | Inverting outputs for first buffer group; driven LOW when corresponding 1An is HIGH. |
| 19 | 2OE | Active-low enable for second 4 outputs (2Y0–2Y3); decouples second group independently. |
| 20 | VCC | Positive supply rail (2.0–5.5 V); powers internal logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage-tolerant inputs | Accepts up to +7.0 V regardless of VCC - enables safe interfacing with 5 V signals on 3.3 V systems. |
| Schmitt-trigger inputs | Hysteresis improves noise margin and eliminates false triggering on slow or noisy input edges. |
| Dual independent 3-state control | Separate 1OE and 2OE pins allow selective disabling of either 4-bit group - critical for partial bus arbitration. |
| Low dynamic power dissipation | CPD = 9 pF enables sub-mW dynamic power at 1 MHz - reduces heat and supply ripple in dense logic layouts. |
| Thermally enhanced QFN | DHVQFN20 package offers lower thermal resistance vs. SO20/TSSOP - supports sustained operation at +125 °C. |
Applications
| Industrial PLC I/O Expansion | Test Equipment Signal Conditioning |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from noisy 24 V sensor/actuator lines in modular I/O modules. IC Role / Device Role: Inverting buffer with 3-state outputs acts as direction-controlled interface between MCU and external bus. Use Value: Overvoltage-tolerant inputs withstand induced transients; dual OE allows dynamic bus partitioning during hot-swap events. |
Use Scenario: Driving multiple DUT channels simultaneously while maintaining signal fidelity in automated test fixtures. IC Role / Device Role: Octal inverting driver buffers and translates logic levels between controller and DUT interface cards. Use Value: Balanced propagation delays (<10.8 ns max) ensure channel-to-channel skew <1 ns; Schmitt inputs reject contact bounce noise. |
| Embedded System Address Bus Buffering | Legacy Peripheral Interface Adapter |
|
Use Scenario: Buffering 8-bit address lines between ARM Cortex-M MCU and parallel EEPROM/Flash memory. IC Role / Device Role: Inverting line driver isolates MCU address bus from memory load capacitance and leakage currents. Use Value: ±8 mA drive strength sustains signal integrity across 15 cm PCB traces; 125 °C rating supports fanless enclosure designs. |
Use Scenario: Adapting modern 3.3 V FPGA I/O to legacy 5 V parallel peripherals (e.g., printers, modems). IC Role / Device Role: Level-translating inverting buffer enabling bidirectional communication without external resistors. Use Value: Input tolerance to +7.0 V and CMOS-compatible thresholds eliminate need for discrete level shifters or voltage dividers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHC240PW,118 | TSSOP20 package (4.4 mm width); same electrical specs but higher thermal resistance than DHVQFN20. | Better suited for manual soldering or prototyping; less optimal for high-density, thermally constrained boards. | Select when board layout prioritizes ease of rework over thermal performance or space efficiency. |
| SN74AHC240PWR | Texas Instruments part; identical logic function and DC specs, but different AC timing (tpd = 3.5 ns typ @ 5 V, CL = 50 pF). | Valid for drop-in replacement only if timing margins accommodate ~0.7 ns slower propagation at full load. | Choose when TI supply chain alignment or existing BOM standardization outweighs marginal timing differences. |
Compared with 74AHC240PW,118 and SN74AHC240PWR, the 74AHC240BQ,115 provides superior thermal performance in minimal footprint and tighter propagation delay consistency across voltage and temperature - making it optimal for space-constrained industrial controllers requiring long-term reliability at 125 °C.
Availability
74AHC240BQ,115 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded computing applications requiring stable component supply, extended temperature support, and high-pin-count logic buffering.
Supply support for 74AHC240BQ,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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The 74AHC240BQ,115 belongs to NXP's AHC logic family, designed for high-speed, low-power, mixed-voltage digital interfacing in demanding industrial environments where reliability across wide temperature ranges is essential.
FAQ
What is the maximum input voltage rating for 74AHC240BQ,115?
The 74AHC240BQ,115 supports input voltages from −0.5 V to +7.0 V, independent of VCC. This overvoltage tolerance allows safe connection to 5 V signals even when powered from 3.3 V, eliminating external clamping diodes in mixed-voltage systems. The absolute maximum rating applies across the full −40 °C to +125 °C operating range.
Does 74AHC240BQ,115 support true bidirectional data flow?
No - the 74AHC240BQ,115 is strictly an inverting unidirectional buffer. Each input (e.g., 1A0) drives exactly one corresponding inverted output (1Y0); there is no internal feedback or direction-control logic. Bidirectional operation requires external control of OE pins and careful system-level protocol design - the 74AHC240BQ,115 itself does not implement bus transceivers or direction sensing.
Can 74AHC240BQ,115 be used as a level shifter between 3.3 V and 5 V logic?
Yes - the 74AHC240BQ,115 functions as a robust passive level shifter: its inputs accept up to +7.0 V, and its outputs swing rail-to-rail (VOH ≈ VCC, VOL ≈ 0 V). When VCC = 3.3 V, it safely accepts 5 V inputs; when VCC = 5.0 V, it drives 5 V-compatible outputs. No external components are needed, and Schmitt-trigger inputs suppress noise during voltage transitions.
What is the thermal performance difference between DHVQFN20 and TSSOP20 packages for 74AHC240BQ,115?
The DHVQFN20 package (74AHC240BQ,115) has significantly lower thermal resistance than TSSOP20: Ptot derating begins above 60 °C at 4.5 mW/K, versus 5.5 mW/K for TSSOP20. Combined with its exposed thermal pad (pin 10 GND), the DHVQFN20 enables sustained 500 mW operation at +125 °C ambient - critical for fanless industrial enclosures where the 74AHC240BQ,115 must maintain timing integrity without thermal throttling.
How does the dual OE architecture of 74AHC240BQ,115 improve system design flexibility?
The 74AHC240BQ,115 features two independent active-low output enables (1OE and 2OE), allowing separate control of its two 4-bit buffer groups. This enables partial bus isolation - for example, holding one memory bank's address lines in high-Z while actively driving another. Unlike single-OE octal buffers, the 74AHC240BQ,115 eliminates need for additional logic or multiplexers when implementing segmented bus arbitration in real-time control systems.
74AHC240BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74AHC
- Package/Case:
- 20-VFQFN Exposed Pad
- 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-DHVQFN (4.5x2.5)
74AHC240BQ,115 FAQ
1.How can I place an order for 74AHC240BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC240BQ,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 74AHC240BQ,115 reliable?
The price and inventory of 74AHC240BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC240BQ,115 is usually 5 days.
3.What payment methods are accepted for 74AHC240BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHC240BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHC240BQ,115?
74AHC240BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC240BQ,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 74AHC240BQ,115?
For technical support, including 74AHC240BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC240BQ,115 requirements.
6.How does Aetrix verify that 74AHC240BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74AHC240BQ,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 74AHC240BQ,115 meets industry standards.
7.What is the process for return or replacement of 74AHC240BQ,115?
All 74AHC240BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC240BQ,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 74AHC240BQ,115 part is unused and in its original packaging.
Return procedure for 74AHC240BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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