Nexperia USA Inc. 74HC7540D-Q100J

Overview

74HC7540D-Q100 from Nexperia is an automotive-qualified octal inverting Schmitt-trigger buffer/line driver with 3-state outputs, dual active-low output enables (OE1, OE2), wide 2.0–6.0 V supply range, and operation up to +125 °C. It transforms slow-rising/falling inputs into clean digital outputs and supports high-noise environments in engine control units and body electronics.

For engineers reviewing the 74HC7540D-Q100 datasheet, 74HC7540D-Q100 pinout, 74HC7540D-Q100 application, or 74HC7540D-Q100 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 timing, AEC-Q100 Grade 1 qualification, and SO20 (SOT163-1) package compatibility.

Technical Context

This device implements eight independent inverting buffer channels, each with Schmitt-trigger input thresholds (VT+ = 1.8–4.2 V, VT− = 0.3–1.35 V at VCC = 2.0–6.0 V) and configurable 3-state output control via two separate enable inputs. The dual OE architecture allows selective channel grouping for bus arbitration or power-gated subsystems.

Its CMOS design ensures low static current (≤160 μA at VCC = 6.0 V), high noise immunity (>40% of VCC), and robust ESD protection (HBM >2000 V, CDM >1000 V), meeting JEDEC JESD7A and JESD8C standards across its full −40 °C to +125 °C operating range.

Key Specifications

Pinout & Package

74HC7540D-Q100 is housed in a plastic small outline package (SO20), SOT163-1 variant, with 20 leads and 7.5 mm body width. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise orientation from the index mark.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.

Compared with SN74LVTH16244A-Q1 and 74LVC125APW-Q100, the 74HC7540D-Q100 uniquely combines octal inverting logic, dual 3-state control, Schmitt-trigger inputs, and full 2.0–6.0 V operation - making it irreplaceable for automotive sensor signal conditioning and mixed-voltage bus isolation.

Availability

74HC7540D-Q100 is available at Aetrix Electronics and suitable for engine control units, body control modules, instrument clusters, and ADAS camera subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC7540D-Q100 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 specializing in high-performance, high-reliability logic, discrete, and MOSFET solutions, with leadership in automotive-grade components.

The 74HC7540-Q100 belongs to Nexperia's automotive-qualified HC logic family, designed specifically for noise-immune signal conditioning and bus interfacing in harsh-temperature automotive ECUs and body electronics.

FAQ

What is the maximum clock frequency supported by the 74HC7540D-Q100?

The 74HC7540D-Q100 is not a clocked device-it has no internal clock or synchronous operation. Its usable signal frequency depends on propagation delay and load capacitance. With tpd = 11 ns (typ.) at VCC = 6.0 V and CL = 50 pF, it reliably handles digital edges up to ~45 MHz in point-to-point configurations, assuming proper layout and termination.

Can OE1 and OE2 be tied together for single-enable operation?

Yes-OE1 and OE2 may be connected to a common control signal. Doing so activates or disables all eight outputs simultaneously, effectively converting the dual-enable device into a standard octal 3-state buffer. No additional components or timing constraints are required for this configuration.

Does the 74HC7540D-Q100 support hot-swap or live-insertion?

No-this device lacks hot-swap protection features such as power-up sequencing control, slew-rate limiting, or back-drive prevention. Applying VCC while inputs are driven can cause latch-up or excessive current flow. Power must be applied before asserting any input or enable signals.

How does the Schmitt-trigger input improve performance in automotive environments?

The Schmitt-trigger input provides 0.3–0.5 V hysteresis, rejecting voltage fluctuations caused by electromagnetic interference, alternator ripple, or relay switching transients. This prevents false triggering on slow or noisy signals from switches, potentiometers, or inductive sensors-critical for reliable operation in engine bays and chassis systems.