Nexperia USA Inc. 74HC240BQ,115

Overview

74HC240BQ,115 from Nexperia is an octal inverting 3-state buffer/line driver in DHVQFN20 package, operating from 2.0 V to 6.0 V supply, with dual independent output enables (1OE, 2OE), ±35 mA output drive, and propagation delay as low as 9 ns at VCC = 6.0 V. It serves as a bidirectional bus interface or level-shifting driver in industrial control backplanes and microcontroller I/O expansion circuits.

For engineers reviewing the 74HC240BQ,115 datasheet, 74HC240BQ,115 pinout, 74HC240BQ,115 application, or 74HC240BQ,115 equivalent, key selection criteria include its 20-terminal thermal-enhanced QFN footprint, inverting logic behavior per channel, dual 4-bit enable control, guaranteed operation up to +125 °C, and compatibility with both CMOS- and TTL-level inputs depending on variant.

Technical Context

This device implements two independent 4-bit inverting buffer sections, each controlled by its own active-low 3-state enable input (1OE for Y0–Y3, 2OE for Y4–Y7). All eight outputs are inverted relative to their corresponding inputs (A0–A3 and A4–A7), and enter high-impedance state when respective OE is HIGH.

Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static characteristics guarantee VIH ≥ 4.2 V and VOL ≤ 0.26 V at VCC = 6.0 V and IO = 7.8 mA, while dynamic performance delivers tpd = 9–17 ns and tt = 4–10 ns across supply and temperature ranges.

Key Specifications

Pinout & Package

DHVQFN20 (SOT764-1) package: 2.5 × 4.5 × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad (non-soldered by default); optimized for high-density routing and thermal performance in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal inverting buffer applications.

Compared with 74HC240PW,118 and SN74HC240PWR, the 74HC240BQ,115 offers superior thermal management via its exposed-pad DHVQFN20 package and tighter ICC specification, making it optimal for compact, high-reliability industrial modules requiring continuous 125 °C operation.

Availability

74HC240BQ,115 is available at Aetrix Electronics and suitable for industrial automation backplanes, automotive body control units, microcontroller I/O expansion systems, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for 74HC240BQ,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 semiconductors for efficient energy use, connectivity, and reliability in automotive, industrial, and consumer applications.

The 74HC240BQ belongs to Nexperia's standard logic family designed for robust, pin-compatible replacements of legacy 74-series devices with enhanced ESD tolerance, wider voltage range, and modern packaging for high-density PCBs.

FAQ

What is the maximum output current per pin for 74HC240BQ,115?

The absolute maximum output current per pin is ±35 mA, as specified in Table 4 (Limiting Values) of the datasheet. Continuous DC operation at this level requires adherence to thermal derating curves: total power dissipation must not exceed 500 mW, decreasing by 12.9 mW/K above 111 °C ambient.

Can 74HC240BQ,115 interface 3.3 V microcontroller outputs to 5 V peripherals?

Yes - the 74HC240BQ accepts CMOS-level inputs compatible with 3.3 V logic (VIH ≥ 2.1 V at VCC = 4.5 V), and its outputs swing rail-to-rail up to VCC = 5 V. Its integrated input clamp diodes also allow safe 5 V-tolerant input operation when used with appropriate current-limiting resistors.

Is the thermal pad on the DHVQFN20 package required to be soldered?

No - the exposed thermal pad (terminal 1 index area) has no electrical requirement to be soldered. If soldered, it must remain electrically floating or be connected to GND; improper grounding can disrupt signal integrity or cause latch-up in adjacent circuitry.

How does the dual output enable architecture improve system timing?

Dual OE inputs (1OE and 2OE) allow independent control of two 4-bit output groups, enabling staggered bus release, reduced contention during multi-master arbitration, and elimination of external gating logic. This reduces propagation delay uncertainty by up to 3 ns compared to single-enable octal buffers in time-critical control loops.