Nexperia USA Inc. 74AHC594D,118

Overview

74AHC594D,118 from Nexperia is an 8-bit serial-in, parallel-out shift register with independent storage register, dual positive-edge-triggered clocks (SHCP and STCP), active-low asynchronous resets (SHR and STR), and cascading serial output Q7S. It operates from 2.0 V to 5.5 V, supports -40 °C to +125 °C, and delivers ≤7.8 ns propagation delay at 5 V with 50 pF load. It enables precise timing-critical serial-to-parallel data conversion in LED matrix drivers and industrial I/O expanders.

For engineers reviewing the 74AHC594D,118 datasheet, 74AHC594D,118 pinout, 74AHC594D,118 application, or 74AHC594D,118 equivalent, this device serves as a robust, temperature-hardened alternative to legacy 74LS595 in high-noise embedded control systems requiring independent shift/storage clocking and Schmitt-trigger inputs.

Technical Context

The 74AHC594D,118 integrates two synchronous but functionally isolated register stages: an 8-bit shift register accepting serial data on DS with SHCP clocking, and an 8-bit D-type storage register loaded via STCP. Both registers feature dedicated active-low reset inputs (SHR, STR) that operate independently without affecting the other stage.

Its dual-clock architecture enables deterministic pipeline behavior: when SHCP and STCP are driven separately, the storage register latches the *previous* shift register state on each STCP edge - enabling glitch-free output updates. The Q7S serial output allows daisy-chaining multiple units without external logic.

Key Specifications

Pinout & Package

74AHC594D,118 uses the SO16 plastic small outline package (SOT109-1), 16-pin, 3.9 mm body width, with gull-wing leads and standard JEDEC MS-012 footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register applications.

Compared with 74AHCT594D,118, the AHC variant offers wider VCC range and better noise immunity; compared with SN74HC595PWR, it provides superior timing control, thermal ruggedness, and fault recovery capability - making it optimal for industrial and automotive deployments.

Availability

74AHC594D,118 is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expansion, automotive body controllers, and test equipment pattern generators requiring stable component supply across extended temperature ranges.

Supply support for 74AHC594D,118 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 high-volume, high-reliability logic, discrete, and MOSFET solutions - spun off from NXP in 2017 and headquartered in Nijmegen, Netherlands.

The 74AHC series targets industrial and automotive applications demanding wide VCC range, high noise immunity, and extended temperature operation - designed specifically for robustness in electrically noisy, thermally demanding environments.

FAQ

Can 74AHC594D,118 operate reliably at 2.0 V supply?

Yes. The device is fully specified from 2.0 V to 5.5 V, with guaranteed VIH/VIL thresholds, propagation delays ≤10.6 ns, and output drive ≥4 mA at 2.0 V. It maintains full functionality including Schmitt-trigger action and reset behavior across this range.

What happens if SHCP and STCP are tied together?

When SHCP and STCP share a common clock, the storage register always latches the *prior* shift register state - meaning Q0–Q7 reflect data shifted in during the previous SHCP cycle. This creates a one-cycle pipeline delay but avoids output glitches.

Is Q7S output buffered or open-drain?

Q7S is a standard CMOS push-pull output, not open-drain. It sources/sinks ±8 mA at 4.5 V and matches the electrical characteristics of Q0–Q7 - enabling direct connection to the DS input of another 74AHC594 without pull-up resistors.

Does SHR affect the storage register outputs (Q0–Q7)?

No. SHR is strictly confined to the shift register - it clears only the internal shift stages (0–7) and has no effect on the storage register or Q0–Q7 outputs. Similarly, STR affects only Q0–Q7 and leaves the shift register intact.