Nexperia USA Inc. 74AHC9541APWJ

Overview

74AHC9541APWJ from Nexperia is an octal 3-state buffer/line driver with Schmitt-trigger inputs, IOFF partial power-down protection, and mixed-voltage translation capability (1.8 V to 5.5 V). It provides inverting/non-inverting data path selection via the S input and high-impedance output control via OE, enabling bus isolation in industrial I/O expansion and legacy interface bridging.

For engineers reviewing the 74AHC9541APWJ datasheet, 74AHC9541APWJ pinout, 74AHC9541APWJ application, or 74AHC9541APWJ equivalent, key selection criteria include propagation delay at 3.3 V (4.4 ns typ), Schmitt-trigger hysteresis (0.5–1.6 V), IOFF leakage (<0.5 μA at VCC = 0 V), TSSOP20 thermal derating (10 mW/K above 100 °C), and -40 °C to +125 °C operating range.

Technical Context

The device implements dual-mode logic operation: when S = LOW, outputs invert A0–A7; when S = HIGH, outputs follow inputs non-invertingly. All eight data inputs (A0–A7), select (S), and output enable (OE) incorporate Schmitt-trigger circuitry with VT+ and VT− thresholds defined per VCC (e.g., VT+ = 3.85 V, VT− = 1.65 V at VCC = 5.5 V).

IOFF circuitry actively disables outputs during power-down by blocking backflow current, meeting JESD78 Class II latch-up immunity (>250 mA) and supporting hot-swap and partial-power-down system architectures without external isolation components.

Key Specifications

Pinout & Package

TSSOP20 (SOT360-1) package: 20-pin plastic thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, 1.1 mm max height - optimized for high-density PCB layouts with thermal derating of 10 mW/K above 100 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC8T245PW and SN74AHC244PWR, the 74AHC9541APWJ uniquely combines selectable inversion, Schmitt-trigger noise immunity, and single-supply mixed-voltage operation in one TSSOP20 package-making it optimal for space-constrained, electrically noisy industrial interfaces requiring flexible signal polarity.

Availability

74AHC9541APWJ is available at Aetrix Electronics and suitable for industrial I/O expansion, motor drive control logic, and legacy interface bridging requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74AHC9541APWJ 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 leading Dutch semiconductor manufacturer specializing in high-performance logic, analog, and discrete components for industrial, automotive, and consumer applications.

The 74AHC logic family delivers advanced CMOS performance with wide supply range, low power, and robust ESD/latch-up immunity-designed specifically for reliable signal conditioning and bus interface in harsh industrial environments.

FAQ

Can the 74AHC9541APWJ operate with VCC = 1.8 V while accepting 3.3 V inputs?

Yes. Its overvoltage-tolerant inputs accept up to 5.5 V regardless of VCC, enabling safe 3.3 V → 1.8 V level translation without external clamping. The Schmitt-trigger thresholds scale with VCC (e.g., VT+ ≈ 0.63 × VCC), maintaining consistent hysteresis margin across the 1.8–5.5 V range.

What is the maximum capacitive load the outputs can drive at 100 MHz?

At 100 MHz, the recommended maximum load is 15 pF to maintain tpd ≤ 8 ns and signal integrity. With CL = 15 pF and VCC = 3.3 V, propagation delay is 4.4 ns typical; exceeding 15 pF increases delay nonlinearly and may cause overshoot/undershoot beyond VOL(p)/VOH(v) limits specified in Table 8.

How does the IOFF feature behave when VCC is ramping during power-up?

IOFF activates automatically when VCC drops below ~0.8 V, disabling outputs before supply collapse. During power-up, outputs remain in high-impedance until VCC exceeds the minimum functional threshold (~1.5 V), preventing metastability or bus contention during brown-out conditions.

Is the S input latched or edge-triggered?

The S input is level-sensitive and combinational-not latched or edge-triggered. Output polarity changes synchronously with S level transitions, with propagation delay matching An→Yn timing (e.g., 5.1 ns typ at 5 V). No setup/hold timing relative to clock is required since the device is asynchronous.