Nexperia USA Inc. 74AHC594D,112

Overview

74AHC594D,112 from Nexperia is an 8-bit non-inverting serial-in, parallel-out shift register with independent storage register, dual positive-edge 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 - used in LED matrix drivers and industrial I/O expansion where synchronized data latching and daisy-chained control are required.

For engineers reviewing the 74AHC594D,112 datasheet, 74AHC594D,112 pinout, 74AHC594D,112 application, or 74AHC594D,112 equivalent, this device enables precise timing-critical serial-to-parallel conversion with separate shift/storage clock domains, Schmitt-trigger inputs for noise immunity, and overvoltage-tolerant inputs up to 5.5 V - critical for robust microcontroller peripheral interfacing in harsh environments.

Technical Context

The 74AHC594D implements a two-stage architecture: an 8-bit shift register fed by DS and clocked by SHCP, followed by an 8-bit D-type storage register loaded via STCP. Both registers feature independent asynchronous active-low clears (SHR and STR), enabling selective reset without disturbing the other stage.

Its dual-clock design allows pipelined operation: data shifts in on SHCP edges and is latched into outputs on STCP edges - supporting synchronous output updates while maintaining continuous serial input flow. The Q7S output enables seamless cascading of multiple devices without external logic.

Key Specifications

Pinout & Package

74AHC594D,112 uses the SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, surface-mount compatible with standard reflow profiles.

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,112, the AHC version offers wider voltage flexibility and lower static current, while SN74HC595PWR sacrifices architectural control for lower unit cost - making 74AHC594D,112 optimal for temperature-extreme, noise-prone, or precision-timing applications.

Availability

74AHC594D,112 is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expanders, and remote control decoder interfaces requiring stable component supply across automotive, industrial, and consumer production cycles.

Supply support for 74AHC594D,112 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 optimized for efficiency, reliability, and miniaturization in mass-market electronics.

The 74AHC594D belongs to Nexperia's AHC logic family - engineered for high-speed, low-power, wide-VCC operation in space-constrained industrial and automotive control systems where signal integrity and thermal resilience are critical.

FAQ

Can 74AHC594D,112 operate reliably at 2.0 V supply?

Yes - the device is fully specified from 2.0 V to 5.5 V. At 2.0 V, propagation delay increases to ≤14.3 ns (CL = 50 pF), and output drive reduces to ±4 mA, but all logic functions, Schmitt-trigger behavior, and reset functionality remain guaranteed across -40 °C to +125 °C.

What happens if SHCP and STCP are tied together?

When SHCP and STCP are connected, the shift register advances one bit on each clock edge before the storage register latches - resulting in Q0–Q7 always reflecting the previous shift cycle's data. This creates a one-cycle pipeline delay but remains functionally valid for simple applications.

Is Q7S output inverted relative to Q7?

No - Q7S is the true (non-inverted) output of the final shift register stage. It matches the logic state present at Q7 *before* that bit is transferred to the storage register, enabling correct bit alignment in cascaded configurations.

How does the Schmitt-trigger input improve noise immunity?

Schmitt-trigger inputs provide hysteresis (~0.3 V typical at 5 V), meaning VIH and VIL thresholds differ - preventing multiple toggles on slow or noisy edges. This eliminates false clocking or spurious resets caused by EMI, crosstalk, or long PCB traces without external RC filtering.