Nexperia USA Inc. 74HC541D,653

Overview

74HC541D,653 from Nexperia is an octal non-inverting 3-state buffer/line driver in SO20 (SOT163-1) package, operating from 2.0 V to 6.0 V supply, featuring dual active-low output enables (OE1, OE2), CMOS-level inputs, and ±35 mA output drive capability. It serves as a bidirectional bus interface or signal isolation device in digital logic systems such as industrial controllers and embedded I/O expansion.

For engineers reviewing the 74HC541D,653 datasheet, 74HC541D,653 pinout, 74HC541D,653 application, or 74HC541D,653 equivalent, key selection criteria include supply voltage range (2.0–6.0 V), propagation delay (10–35 ns at VCC = 4.5–6.0 V), 3-state enable timing, thermal rating (−40 °C to +125 °C), and SO20 package compatibility with legacy PCB footprints.

Technical Context

This device implements eight identical non-inverting buffer circuits, each with independent input-to-output signal path and shared 3-state control via two active-low enables. Its CMOS architecture ensures low static current (≤160 μA at VCC = 6.0 V) and high noise immunity (typical HNM > 1.3 V at VCC = 4.5 V).

The dual OE inputs allow hierarchical bus control-OE1 and OE2 must both be LOW for outputs Y0–Y7 to drive; either HIGH forces all outputs into high-impedance state. Input clamp diodes support interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HC541D,653 uses the SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, with standard 1.27 mm pitch and gull-wing leads suitable for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC541D,653, the 74HCT541D,653 offers guaranteed TTL input compatibility at the cost of reduced noise margin, while SN74HC541PWR delivers identical functionality in a smaller, thermally distinct package requiring layout revision.

Availability

74HC541D,653 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface, memory address latching, and LED segment driver interface requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC541D,653 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 logic, analog, and MOSFET solutions with focus on reliability, efficiency, and scalability for industrial and consumer applications.

The 74HC541 belongs to Nexperia's high-speed CMOS logic family, designed specifically for robust signal buffering and bus isolation in noise-prone, wide-temperature industrial control systems.

FAQ

Can 74HC541D,653 operate at 3.3 V supply?

Yes. The device is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, typical propagation delay is ~18 ns (CL = 50 pF), VIH = 2.31 V, and VOL = 0.26 V at 6 mA sink - meeting standard 3.3 V LVTTL and LVCMOS interface requirements without level translation.

What happens if only one OE pin is asserted HIGH?

When either OE1 or OE2 is HIGH, all eight outputs (Y0–Y7) enter high-impedance state regardless of the other OE pin's level. Both OE1 and OE2 must be LOW simultaneously for outputs to drive - this OR logic ensures fail-safe bus isolation during power-up, reset, or fault conditions.

Is thermal pad required for SO20 package?

No. The SOT163-1 (SO20) package has no exposed thermal pad. Thermal performance relies on copper pour under the package body and adequate PCB trace width for VCC/GND connections. For continuous 500 mW dissipation, ≥250 mm² of 2 oz copper on inner layers is recommended per Nexperia AN10672.

How does input clamping affect overvoltage tolerance?

Clamp diodes on all inputs (A0–A7, OE1, OE2) allow safe operation with input voltages up to VCC + 0.5 V when series current-limiting resistors are used. For example, with a 1 kΩ resistor and 12 V input, peak clamp current remains below 20 mA - within absolute maximum rating and preventing damage to internal gates.