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Nexperia USA Inc. 74HCT240BQ,115
- Part No.:
- 74HCT240BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74HCT240BQ,115.pdf
- Description:
- IC BUFFER INVERT 5.5V 20DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,903
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Product details
Overview
74HCT240BQ,115 from Nexperia is an octal inverting 3-state buffer/line driver with dual output enables (1OE, 2OE), TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.0 V), 20-terminal DHVQFN package, and operation across -40 °C to +125 °C. It functions as two independent 4-bit buffers or one 8-bit buffer in bus interface, address/data isolation, and memory I/O applications.
For engineers reviewing the 74HCT240BQ,115 datasheet, 74HCT240BQ,115 pinout, 74HCT240BQ,115 application, or 74HCT240BQ,115 equivalent, key selection factors include TTL-level input compatibility, 3-state output timing (tpd = 9 ns typ @ VCC = 5.0 V, CL = 15 pF), thermal-enhanced DHVQFN20 package (2.5 × 4.5 × 0.85 mm), dual enable control per 4-bit group, and industrial temperature range support.
Technical Context
The 74HCT240BQ,115 implements two independent 4-bit inverting buffer sections, each controlled by a dedicated active-low output enable (1OE for Y0–Y3, 2OE for Y4–Y7). Inputs feature clamp diodes enabling safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
Its TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5.0 V) ensure direct compatibility with legacy 5 V logic families, while CMOS output stages deliver VOH ≥ 3.7 V and VOL ≤ 0.4 V under 6 mA load, supporting robust noise margins in mixed-signal bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with 3-state outputs; supports bus isolation via dual OE control. |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures stable operation in standard 5 V systems with ±10 % tolerance. |
| Propagation Delay | 9 ns typical (VCC = 5.0 V, CL = 15 pF) - enables reliable timing in high-speed digital interfaces up to ~50 MHz. |
| Output Drive | ±6 mA (VOH/VOL guaranteed at 6 mA load) - sufficient to drive multiple TTL inputs or moderate PCB trace capacitance. |
| Operating Temperature | -40 °C to +125 °C - qualified for industrial and extended-temperature embedded control applications. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max (VCC = 5.0 V) - matches standard TTL logic levels for seamless interoperability. |
| Power Dissipation | 160 μA ICC max (VCC = 5.5 V, -40 °C to +125 °C) - ultra-low static current suitable for power-constrained designs. |
Pinout & Package
DHVQFN20 package (SOT764-1): 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad (non-soldered by default); optimized for thermal performance and board space efficiency in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - independently disable first or second 4-bit output group to prevent bus contention. |
| 2, 4, 6, 8 | 1A0–1A3 | Inverting input group A - drives outputs 1Y0–1Y3 with logical inversion (e.g., 1A0 → 1Y0 = NOT 1A0). |
| 11, 13, 15, 17 | 2A0–2A3 | Inverting input group B - drives outputs 2Y0–2Y3 with logical inversion, isolated from group A. |
| 12, 14, 16, 18 | 1Y0–1Y3 | 3-state inverting outputs for group A - high-impedance when 1OE = HIGH; otherwise inverted 1Ax. |
| 3, 5, 7, 9 | 2Y0–2Y3 | 3-state inverting outputs for group B - high-impedance when 2OE = HIGH; otherwise inverted 2Ax. |
| 10 | GND | Ground reference (0 V) - required return path for all signals and power; thermal pad may be left floating or tied to GND. |
| 20 | VCC | Positive supply (4.5–5.5 V) - powers internal logic and output drivers; decoupling near pin essential. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5.0 V - eliminates need for level-shifting when interfacing with legacy 5 V microcontrollers or FPGAs. |
| Dual independent 3-state controls | Separate 1OE and 2OE pins - enables selective bus arbitration without gating entire 8-bit path, reducing signal routing complexity. |
| Clamp diode protected inputs | Internal diodes to VCC and GND - allows safe connection of inputs to voltages > VCC using external current-limiting resistors. |
| Industrial temperature range | -40 °C to +125 °C operation - supports deployment in motor drives, PLCs, and outdoor industrial equipment without derating. |
| Low dynamic power | CPD = 30 pF per buffer - minimizes switching power (PD = CPD × VCC² × fi × N), critical for high-frequency clock distribution. |
Applications
| Memory Address Buffering | Microcontroller Bus Isolation |
|---|---|
|
Use Scenario: Isolating address lines between a microcontroller and parallel SRAM or EPROM to prevent back-driving during reset or sleep modes. IC Role / Device Role / Timing Role: Inverting 3-state buffer with dual OE control - enables clean address bus release by asserting 1OE/2OE during MCU reset, eliminating contention. Use Value: Prevents data corruption and latch-up risk during power transitions; supports hot-plug capability in modular memory subsystems. |
Use Scenario: Separating bidirectional data bus segments between an MCU and peripheral ICs (e.g., ADC, DAC, display controller) sharing a common bus. IC Role / Device Role / Timing Role: Octal inverting buffer with independent OE groups - allows time-multiplexed access where MCU controls 1OE for write cycles and 2OE for read cycles. Use Value: Eliminates need for complex bus arbitration logic; reduces PCB layer count by enabling single-layer bus routing with local buffering. |
| Industrial I/O Expansion | Legacy System Interface Adapter |
|
Use Scenario: Driving 8-bit parallel I/O ports from programmable logic (CPLD/FPGA) to control relays, LEDs, or sensors in factory automation panels. IC Role / Device Role / Timing Role: Inverting line driver with 6 mA output drive - provides sufficient current to directly sink/source LED indicators or relay coils without external transistors. Use Value: Reduces BOM count and board area; thermal-enhanced DHVQFN20 package sustains continuous 6 mA per output at +125 °C ambient. |
Use Scenario: Interfacing modern 3.3 V or 5 V microcontrollers to legacy TTL-based instrumentation (e.g., GPIB peripherals, test equipment control buses). IC Role / Device Role / Timing Role: TTL-input compatible octal buffer - accepts 2.0 V VIH from older TTL outputs while driving CMOS loads with low VOL/VOH. Use Value: Bridges voltage and timing domain mismatches without external level shifters; maintains <10 ns propagation delay for real-time control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT240PW,118 | TSSOP20 package (4.4 mm width); identical electrical specs and pinout; 0.65 mm pitch vs. DHVQFN's 0.5 mm. | Better manual solderability and optical inspection access; lower thermal performance than DHVQFN at sustained 6 mA loads. | Select for prototyping, low-volume assembly, or when thermal pad reflow is not available. |
| SN74HCT240PWR | Texas Instruments TSSOP20; VIH/VIL match within 0.1 V; tpd = 11 ns typ (vs. 9 ns); ICC = 200 μA max at +125 °C. | Slightly slower timing margin; higher max supply current affects battery life in always-on monitoring nodes. | Select only if TI supply chain preference overrides Nexperia's tighter timing and lower ICC. |
Compared with 74HCT240PW,118 and SN74HCT240PWR, the 74HCT240BQ,115 offers superior thermal dissipation in compact layouts and the lowest propagation delay, making it optimal for high-density industrial controllers where timing closure and junction temperature management are critical.
Availability
74HCT240BQ,115 is available at Aetrix Electronics and suitable for industrial control systems, automotive ECUs requiring extended temperature support, and high-reliability embedded instrumentation requiring stable component supply over multi-year production cycles.
Supply support for 74HCT240BQ,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 high-volume, high-reliability logic, discrete, and MOSFET solutions, with leadership in automotive-grade and industrial-standard components.
The 74HCT240BQ,115 belongs to Nexperia's 74HCT logic family, engineered specifically for robust 5 V system interfacing with TTL compatibility, wide temperature operation, and enhanced ESD resilience (HBM > 2000 V) in industrial and infrastructure applications.
FAQ
Can the 74HCT240BQ,115 operate at 3.3 V supply?
No. The 74HCT240BQ,115 is specified only for 4.5 V to 5.5 V operation per its recommended conditions. At 3.3 V, input thresholds (VIH ≥ 2.0 V) become marginal, and output drive (VOH/VOL) falls outside specification. Use 74LVC240 or 74ALVC240 for 3.3 V systems.
Is the exposed thermal pad on the DHVQFN20 package required to be soldered?
No. Per Nexperia's datasheet note, the thermal pad (terminal 1 index area) has no electrical or mechanical requirement to be soldered. If soldered, it must remain electrically floating or be connected to GND - never to VCC or signal nets - to avoid parasitic coupling or thermal stress.
What is the maximum capacitive load the 74HCT240BQ,115 can drive while maintaining timing specs?
The device is characterized up to 50 pF load capacitance (Table 9). At CL = 50 pF and VCC = 5.0 V, tpd increases to ≤30 ns (max) and tt to ≤18 ns (max). For designs requiring <15 ns tpd, keep CL ≤ 15 pF using short traces and minimal stubs.
How does the 74HCT240BQ,115 handle input voltages exceeding VCC?
Inputs include clamp diodes to VCC and GND. When an input exceeds VCC, current flows through the VCC clamp diode. To limit this current to ≤20 mA (absolute max), a series resistor must be used: R ≥ (VIN − VCC)/20 mA. For VIN = 7 V and VCC = 5 V, R ≥ 100 Ω is required.
74HCT240BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- 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)
74HCT240BQ,115 FAQ
1.How can I place an order for 74HCT240BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT240BQ,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 74HCT240BQ,115 reliable?
The price and inventory of 74HCT240BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT240BQ,115 is usually 5 days.
3.What payment methods are accepted for 74HCT240BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT240BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT240BQ,115?
74HCT240BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT240BQ,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 74HCT240BQ,115?
For technical support, including 74HCT240BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT240BQ,115 requirements.
6.How does Aetrix verify that 74HCT240BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74HCT240BQ,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 74HCT240BQ,115 meets industry standards.
7.What is the process for return or replacement of 74HCT240BQ,115?
All 74HCT240BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT240BQ,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 74HCT240BQ,115 part is unused and in its original packaging.
Return procedure for 74HCT240BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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