Nexperia USA Inc. 74HC240DB,112

Overview

74HC240DB,112 from Nexperia is an octal inverting 3-state buffer/line driver with dual independent output-enable controls (1OE and 2OE), operating across 2.0 V to 6.0 V supply range. It provides eight buffered, inverted outputs split into two groups of four, each controlled by a separate enable input. Used for bidirectional bus interfacing, address/data isolation, and logic-level translation in industrial control and embedded I/O expansion systems.

For engineers reviewing the 74HC240DB,112 datasheet, 74HC240DB,112 pinout, 74HC240DB,112 application, or 74HC240DB,112 equivalent, key selection factors include its 3-state inverting architecture, dual OE control per 4-bit group, CMOS-level input compatibility, propagation delay down to 9 ns at 5 V, and SO20 (SOT163-1) package thermal performance up to +125 °C.

Technical Context

The device implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable inputs (1OE and 2OE). When enabled, inputs A0–A3 drive inverted outputs Y0–Y3 with rail-to-rail CMOS-compatible voltage levels; when disabled, outputs enter high-impedance state to prevent bus contention.

Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static characteristics are specified over -40 °C to +125 °C, with VIH = 3.15 V (min) and VOL = 0.26 V (max) at VCC = 4.5 V and IO = 6.0 mA, ensuring robust noise immunity and TTL-compatible output drive capability.

Key Specifications

Pinout & Package

74HC240DB,112 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Thermal resistance θJA = 109 °C/W (typ), with linear derating above 109 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC240PW,118 and SN74HC240N, the 74HC240DB,112 offers superior thermal performance in compact SO20 packaging and full industrial temperature qualification, making it optimal for production-grade embedded systems requiring long-term reliability and SMT manufacturability.

Availability

74HC240DB,112 is available at Aetrix Electronics and suitable for industrial automation, embedded controller design, and legacy interface adaptation requiring stable component supply, long-lifecycle support, and guaranteed SO20 package consistency.

Supply support for 74HC240DB,112 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 for industrial, automotive, and consumer markets.

The 74HC240DB,112 belongs to Nexperia's 74HC logic family, engineered for low-power, high-speed digital interfacing in space- and energy-constrained embedded systems requiring robust noise immunity and wide supply flexibility.

FAQ

What is the maximum clock frequency supported by the 74HC240DB,112?

The 74HC240DB,112 is not a clocked device-it has no internal clock and operates asynchronously. Its usable data rate depends on propagation delay (9 ns typ at 5 V) and system timing margins. For reliable operation with 15 pF load, it supports data edges up to approximately 50 MHz in well-designed PCB layouts with proper termination and decoupling.

Can 74HC240DB,112 drive a 50 Ω transmission line directly?

No. With ±6 mA output drive at 4.5 V, the 74HC240DB,112 cannot properly terminate a 50 Ω line (requiring ~100 mA for 5 V swing). It is designed for CMOS/TTL fan-out and short-board traces-not RF or high-speed serial links. Use dedicated line drivers (e.g., SN65LVDS1) for 50 Ω applications.

Is the 74HC240DB,112 pin-compatible with 74HCT240 variants?

Yes-74HC240DB,112 and 74HCT240DB share identical pinout, package, and functional behavior. The only difference is input threshold: HC uses CMOS-level inputs (VIH ≈ 0.7×VCC), HCT uses TTL-level inputs (VIH = 2.0 V min). Swapping requires verifying source logic family compatibility.

Does the GND pad on the SO20 package require soldering?

No. The exposed thermal pad (pin 10) is electrically connected to GND but has no mechanical solder requirement per Nexperia's datasheet. If soldered, it must remain floating or tied to system GND; improper connection risks ground loops or thermal stress. Most industrial designs omit soldering unless thermal validation confirms benefit.