Nexperia USA Inc. 74LVC240ABQ,115

Overview

74LVC240ABQ,115 from Nexperia is an octal inverting 3-state buffer/line driver with dual independent output enables (1OE, 2OE), 5 V tolerant I/O, Schmitt-trigger inputs, and IOFF partial power-down protection. It operates from 1.2 V to 3.6 V supply, supports mixed-voltage translation between 3.3 V and 5 V systems, and is rated for -40 °C to +125 °C ambient temperature.

For engineers reviewing the 74LVC240ABQ,115 datasheet, 74LVC240ABQ,115 pinout, 74LVC240ABQ,115 application, or 74LVC240ABQ,115 equivalent, key selection criteria include 5 V tolerance on all I/O pins, dual 4-bit enable control, IOFF leakage suppression during power-down, propagation delay ≤7.0 ns at 3.3 V, and DHVQFN20 thermal-enhanced packaging for high-density PCB layouts.

Technical Context

This device implements two independent 4-bit inverting buffer sections, each controlled by its own active-low output enable (1OE for outputs 1Y0–1Y3; 2OE for 2Y0–2Y3). All inputs feature Schmitt-trigger action to tolerate slow edge rates, and the IOFF circuit actively disables outputs when VCC = 0 V, blocking backflow current up to ±20 μA at 5.5 V.

It complies with JEDEC standards JESD8-7A (1.65–1.95 V), JESD8-5A (2.3–2.7 V), and JESD8-C/JESD36 (2.7–3.6 V), and supports dynamic operation across its full 1.2–3.6 V supply range with guaranteed tpd ≤7.0 ns and tdis ≤7.5 ns at VCC = 3.0–3.6 V and Tamb = -40 °C to +125 °C.

Key Specifications

Pinout & Package

DHVQFN20 (SOT764-1) package: 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad (GND-connected or floating per layout requirements).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC240APWR and 74LVC240AD,118, the 74LVC240ABQ,115 delivers superior thermal performance in ultra-compact layouts, supports higher sustained current drive in thermally dense server or automotive modules, and maintains identical logic functionality and voltage tolerances across all three variants.

Availability

74LVC240ABQ,115 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, server baseboard management, and medical diagnostic imaging interfaces requiring stable component supply across extended temperature and mixed-voltage operating conditions.

Supply support for 74LVC240ABQ,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, analog, and discrete components for automotive, industrial, and consumer markets.

The 74LVC240A belongs to Nexperia's LVC (Low-Voltage CMOS) logic family, engineered for robust mixed-voltage interfacing, low static/dynamic power, and extended temperature operation in mission-critical embedded systems.

FAQ

What is the maximum allowable input voltage when VCC = 0 V?

The 74LVC240ABQ,115 supports up to 5.5 V on any input or output pin even when VCC = 0 V, thanks to integrated IOFF circuitry that blocks backflow current. Absolute maximum rating is VI = -0.5 V to +6.5 V, and measured IOFF leakage remains ≤±20 μA at 5.5 V, ensuring safe hot-insertion into live 5 V buses without damage or system upset.

Can both output enable pins (1OE and 2OE) be tied together?

Yes - 1OE and 2OE can be connected to a single control signal to operate the device as a unified 8-bit inverting buffer. This configuration is electrically valid and commonly used in applications requiring full-bus gating. However, doing so forfeits independent control of the two 4-bit groups, which is essential for advanced bus arbitration or partial peripheral isolation.

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

No - the exposed thermal pad (terminal 1 index area) has no electrical requirement to be soldered. If soldered, it must remain floating or be connected to GND; connecting it to any other net risks shorting internal structures. Thermal performance improves with GND connection, but mechanical attachment alone suffices for most applications within the 500 mW Ptot limit.

Does this device support 1.2 V operation with full 5 V I/O tolerance?

Yes - the 74LVC240ABQ,115 is fully specified from VCC = 1.2 V to 3.6 V, and all I/O pins maintain 5.5 V absolute maximum rating and 5 V tolerance across that entire range. Input thresholds scale with VCC (e.g., VIH = 0.65×VCC at 1.2 V), while output drive strength decreases proportionally - verified in Table 6 static characteristics for -40 °C to +125 °C operation.