Nexperia USA Inc. 74AHCT594DB,118

Overview

74AHCT594DB,118 from Nexperia is an 8-bit serial-in, parallel-out shift register with output latches and 3-state outputs, operating at 4.5–5.5 V supply, 12 ns propagation delay (typ), and -40°C to +125°C temperature range. It serves as a data interface buffer in LED display drivers and industrial I/O expanders.

For engineers reviewing the 74AHCT594DB,118 datasheet, 74AHCT594DB,118 pinout, 74AHCT594DB,118 application, or 74AHCT594DB,118 equivalent, key selection criteria include output latch control timing, 3-state enable behavior, serial clock tolerance, and compatibility with 5 V CMOS/TTL logic families.

Technical Context

This device integrates a shift register stage followed by a storage register with separate clock inputs (SHCP for shifting, STCP for latching). The output enable (OE) terminal controls all eight buffered outputs simultaneously into high-impedance state.

It features Schmitt-trigger inputs on serial data (DS) and clock lines, enabling noise immunity in industrial environments. All outputs drive ±24 mA at V_CC = 5 V, supporting direct LED segment driving without external current-limiting resistors in low-duty-cycle applications.

Key Specifications

Pinout & Package

74AHCT594DB,118 is housed in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, and rated for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC595DR and 74LV595PW,118, the 74AHCT594DB,118 uniquely combines 5 V TTL compatibility, Schmitt-trigger noise immunity, ±24 mA drive, and daisy-chain support-making it optimal for robust industrial and automotive display interfaces.

Availability

74AHCT594DB,118 is available at Aetrix Electronics and suitable for LED display modules, industrial PLC I/O subsystems, and automotive dashboard electronics requiring stable component supply and long-term manufacturability.

Supply support for 74AHCT594DB,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 standard logic, analog, and discrete components for automotive, industrial, and consumer markets.

The 74AHCT series delivers TTL-compatible performance with CMOS efficiency, specifically engineered for noise-prone 5 V control systems demanding robust signal integrity and latch-controlled output staging.

FAQ

What is the function of the MR (Master Reset) pin on the 74AHCT594DB,118?

The MR pin is an asynchronous active-low input that clears the shift register to zero but does not affect the output latches. When asserted, it forces all internal shift stages to logic 0; previously latched data remains unchanged until the next STCP pulse. This allows safe initialization of serial data flow without disrupting currently displayed or driven outputs.

Can the 74AHCT594DB,118 operate reliably at 3.3 V supply?

No. The 74AHCT594DB,118 is specified only for 4.5–5.5 V operation. At 3.3 V, input thresholds fall outside TTL-compatible range, propagation delays increase significantly, and output drive drops below guaranteed levels. For 3.3 V systems, consider the 74LV595 or 74LVC595 families instead.

How does the Q7S output enable daisy-chaining of multiple 74AHCT594DB,118 devices?

Q7S outputs the most significant bit (MSB) of the shift register after each SHCP pulse. Connecting Q7S of one device to DS of the next allows serial data to propagate through multiple registers in sequence. With shared SHCP and STCP lines, a single 16-bit (or longer) serial word can be loaded and latched synchronously across the chain.

Is the 74AHCT594DB,118 pin-compatible with the 74HC595?

No. Although both are 8-bit shift registers with latches, the 74AHCT594DB,118 uses a 16-pin TSSOP package with dedicated MR and Q7S pins, whereas the 74HC595 uses a 16-pin SOIC with different pin assignments (e.g., OE is absent; Q7S is labeled Q7'). Direct replacement requires PCB layout revision and signal routing changes.