Nexperia USA Inc. 74HC7540D,118

Overview

74HC7540D,118 from Nexperia is an octal inverting Schmitt-trigger buffer/line driver with 3-state outputs, dual active-low output enables (OE1, OE2), and CMOS-level inputs. It operates from 2.0 V to 6.0 V, delivers 7.8 mA sink/source drive at 4.5 V, supports -40 °C to +125 °C ambient range, and features input clamp diodes for overvoltage-tolerant interfacing-used in industrial bus interface conditioning and noise-prone sensor signal buffering.

For engineers reviewing the 74HC7540D,118 datasheet, 74HC7540D,118 pinout, 74HC7540D,118 application, or 74HC7540D,118 equivalent, key selection criteria include Schmitt-trigger hysteresis (0.3–0.5 V), propagation delay (11–36 ns at VCC = 4.5–6.0 V), 3-state enable/disable timing (12–45 ns), input leakage (<±1.0 μA), and SO20 package thermal derating (12.3 mW/K above 109 °C).

Technical Context

This device implements eight independent inverting buffer channels, each with Schmitt-trigger input thresholds (VT+ = 4.2 V, VT− = 1.8 V at VCC = 6.0 V) and hysteresis (VH = 0.3–0.5 V) to reject slow-rising noise on digital control lines. Its dual active-low output enables allow selective channel gating without bus contention.

The SO20 (SOT163-1) package integrates ground (Pin 10) and VCC (Pin 20) on opposite sides of the body, with inputs A0–A7 (Pins 2–9), outputs Y0–Y7 (Pins 11–18), and OE1/OE2 (Pins 1 and 19). Input clamp diodes permit safe interfacing to signals exceeding VCC when current-limited.

Key Specifications

Pinout & Package

74HC7540D,118 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads, 7.5 mm body width, and standard 1.27 mm lead pitch. Thermal derating begins at 109 °C (12.3 mW/K).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT7540D,118, the HC version offers lower static current and wider VCC range but requires CMOS-level inputs; versus SN74LVTH16244DGGR, it provides Schmitt noise immunity and dual-OE control at the cost of lower drive and narrower voltage tolerance.

Availability

74HC7540D,118 is available at Aetrix Electronics and suitable for industrial bus interface, motor control feedback conditioning, and programmable logic I/O expansion requiring stable component supply across extended temperature ranges.

Supply support for 74HC7540D,118 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 delivering high-performance, reliable discrete, logic, and MOSFET solutions with emphasis on efficiency, reliability, and sustainability.

The 74HC7540 series belongs to Nexperia's high-speed CMOS logic portfolio, designed specifically for robust signal conditioning in electrically noisy industrial and automotive environments where noise immunity and wide supply tolerance are critical.

FAQ

What is the maximum clock frequency supported by 74HC7540D,118?

The device does not operate as a clocked sequential circuit-it is combinational logic with propagation delay of 11 ns (typ.) at VCC = 6.0 V. This supports reliable data throughput up to ~45 MHz in pipelined bus applications, assuming setup/hold timing is managed externally by the driving controller.

Can 74HC7540D,118 drive LEDs directly?

No-its outputs are designed for logic-level interfacing, not LED current sourcing. With ±7.8 mA drive at 4.5 V, it exceeds typical LED forward current (5–20 mA), but lacks current regulation and thermal protection. Use a series resistor and verify voltage drop; dedicated LED drivers are preferred for sustained operation.

Is the SO20 package RoHS-compliant and lead-free?

Yes-74HC7540D,118 in SOT163-1 (SO20) packaging meets RoHS Directive 2011/65/EU and is lead-free, with matte tin (Sn) termination finish and halogen-free molding compound per Nexperia's product compliance documentation.

How do OE1 and OE2 interact logically?

OE1 and OE2 are OR-connected internally: a HIGH on either pin forces all eight outputs (Y0–Y7) into high-impedance state. Both must be LOW for normal inverting buffer operation. This architecture enables fail-safe shutdown using redundant control signals or hierarchical enable trees.