Nexperia USA Inc. 74LV540APWJ

Overview

74LV540APWJ from Nexperia is an octal inverting 3-state buffer/line driver with dual active-low output enables (OE1, OE2), wide 2.0 V to 5.5 V supply range, 6 ns max propagation delay at 5 V, and IOFF partial power-down protection. It serves as a level-translating bus interface in mixed-voltage digital systems such as industrial I/O expansion and microcontroller peripheral buffering.

For engineers reviewing the 74LV540APWJ datasheet, 74LV540APWJ pinout, 74LV540APWJ application, or 74LV540APWJ equivalent, key selection criteria include its Schmitt-trigger inputs for noise immunity, overvoltage-tolerant inputs enabling 5 V-to-3.3 V translation, dual independent output enables for flexible bus control, and -40 °C to +125 °C operation for extended-temperature embedded designs.

Technical Context

This device implements eight independent inverting buffer channels, each with high-impedance tri-state output controlled by either OE1 or OE2. Its IOFF circuitry actively disables outputs and blocks backflow current when VCC = 0 V, supporting hot-swap and partial power-down system architectures.

Schmitt-trigger inputs provide hysteresis (typ. 0.4 V at 3.3 V), enabling robust operation with slow-rising signals or noisy PCB traces. Input voltage tolerance up to 7.0 V allows safe interfacing with higher-voltage logic without external clamping diodes.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1), 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, 1.1 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV540APWR and 74LVC540APW, the 74LV540APWJ uniquely combines 5 V input tolerance, -40 °C to +125 °C operation, and 6 ns speed-making it the sole option for industrial hot-swap I/O expansion requiring both robustness and timing precision.

Availability

74LV540APWJ is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller bus buffering, automated test equipment signal conditioning, and embedded display interface applications requiring stable component supply across extended temperature ranges.

Supply support for 74LV540APWJ 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 efficiency technologies, delivering high-performance logic, analog, and discrete components with industry-leading reliability and quality.

The 74LV logic family targets low-voltage, high-speed digital interfacing in industrial, computing, and communications systems-designed specifically for mixed-supply environments requiring robust noise immunity and seamless voltage translation.

FAQ

What is the maximum input voltage the 74LV540APWJ can tolerate?

The 74LV540APWJ accepts input voltages up to 7.0 V regardless of VCC level, as confirmed in Table 4 (Limiting Values). This overvoltage tolerance enables direct connection to 5 V signals while powered from 3.3 V or 2.5 V supplies without external protection components.

Does the 74LV540APWJ support partial power-down operation?

Yes. Its IOFF circuitry actively disables outputs and limits leakage to <0.5 μA when VCC = 0 V, preventing backflow current during power sequencing or hot-swap events. This behavior is verified in Table 9 (Static Characteristics) and explicitly described in Section 1.

How do OE1 and OE2 function independently?

OE1 controls outputs Y0–Y3; OE2 controls Y4–Y7. Both are active-low: a LOW on OE1 places Y0–Y3 in high-impedance state, while a HIGH enables normal inverting operation. The same applies separately to OE2 and Y4–Y7, allowing segmented bus control without external logic.

What is the typical input hysteresis at 3.3 V supply?

At VCC = 3.3 V, the Schmitt-trigger inputs exhibit typical hysteresis of 0.4 V, calculated as the difference between VIH(AC) = 2.31 V and VIL(AC) = 0.99 V (Table 8). This provides noise margins sufficient to reject >100 mV of superimposed noise on slow-rising control signals.