Nexperia USA Inc. 74HCT541D,653

Overview

74HCT541D,653 from Nexperia is an octal non-inverting 3-state buffer/line driver in SO20 (SOT163-1) package, operating from 4.5 V to 5.5 V with TTL-compatible inputs and ±6 mA output drive. It features dual active-low output enables (OE1, OE2), supports industrial temperature range (−40 °C to +125 °C), and delivers 28 ns typical propagation delay at 4.5 V with 50 pF load - used for bus isolation and data routing in microcontroller peripheral interfaces.

For engineers reviewing the 74HCT541D,653 datasheet, 74HCT541D,653 pinout, 74HCT541D,653 application, or 74HCT541D,653 equivalent, key selection criteria include TTL-level input compatibility, dual independent 3-state control, SO20 thermal performance (12.3 mW/K derating above 109 °C), and guaranteed −40 °C to +125 °C operation without derating.

Technical Context

The device implements eight identical non-inverting buffer circuits, each with output controlled by the logical AND of OE1 and OE2 - both must be LOW for outputs to drive; either HIGH forces all Yn into high-impedance state. Input clamp diodes allow safe interfacing to voltages exceeding VCC when current-limiting resistors are used.

Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure direct connection to legacy 5 V logic families, while CMOS output structure provides rail-to-rail swing and low static current (ICC ≤ 160 μA over full temperature range).

Key Specifications

Pinout & Package

74HCT541D,653 uses the SO20 plastic small outline package (SOT163-1), 7.5 mm body width, 20-pin gull-wing lead frame, with 1.27 mm pitch and JEDEC MS-013 compliance. Thermal resistance θJA = 82 K/W (typical), with linear power derating of 12.3 mW/K above 109 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT541PWRE4, 74HCT541D,653 offers higher thermal mass and creepage for industrial environments; compared with 74HCT244D,653, it provides unified 8-bit control ideal for compact memory-mapped peripherals but less granular than dual-group enable architecture.

Availability

74HCT541D,653 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller peripheral expansion, legacy system bus bridges, and test equipment signal routing requiring stable component supply across extended temperature ranges.

Supply support for 74HCT541D,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, discrete, and MOSFET solutions with focus on reliability, efficiency, and sustainability.

This device belongs to the 74HCT logic family, designed specifically for robust 5 V TTL-compatible interfacing in industrial, automotive, and computing applications where noise immunity and wide temperature operation are essential.

FAQ

What is the maximum clock frequency supported by 74HCT541D,653?

The 74HCT541D,653 is not a clocked device and has no internal clock - it is a combinatorial buffer. Its usable data rate depends on propagation delay (28 ns typical) and system timing margins. With 28 ns tPD and 5 ns setup/hold, it reliably supports asynchronous bus transfers up to ~20 MHz in well-terminated 50 pF loads, assuming clean edges and proper decoupling.

Can 74HCT541D,653 drive a 100 pF capacitive load?

Yes, but with degraded timing: propagation delay increases to ~35 ns and transition time extends to ~18 ns at 100 pF (per datasheet Fig. 5/6 extrapolation). Output drive remains within spec (±6 mA), but signal integrity requires careful layout - keep traces short, use ground planes, and avoid stubs to prevent ringing or overshoot beyond VOH/VOL limits.

Is 74HCT541D,653 pin-compatible with 74HC541D,653?

Yes - identical pinout and package (SO20), but input thresholds differ: 74HC541 requires CMOS-level inputs (VIH = 3.15 V min at 4.5 V), while 74HCT541 accepts TTL levels (VIH = 2.0 V min). Swapping them may cause logic errors if driving sources are marginal TTL outputs; verify input voltage levels before substitution.

Does 74HCT541D,653 require external pull-up or pull-down resistors on OE pins?

No - OE1 and OE2 have no internal pull resistors and must be actively driven. Leaving them floating risks undefined output states and increased ICC. In most designs, OE pins connect to MCU GPIOs or dedicated logic; if unused, tie both to GND via 10 kΩ resistors to ensure enabled state, or to VCC for permanent high-Z (not recommended for bus isolation).