Nexperia USA Inc. 74LVC594AD,112

Overview

74LVC594AD from Nexperia is an 8-bit serial-in/parallel-out shift register with separate shift and storage registers, featuring dual clocks (SHCP and STCP), independent reset inputs (SHR/STR), Schmitt-trigger inputs, and IOFF partial power-down protection. It operates from 1.2 V to 3.6 V, supports 3.3 V/5 V mixed-voltage interfacing, and delivers ≤7.7 ns propagation delay at 3.3 V for LED display drivers and industrial I/O expansion.

For engineers reviewing the 74LVC594AD datasheet, 74LVC594AD pinout, 74LVC594AD application, or 74LVC594AD equivalent, key selection criteria include its dual-register architecture enabling glitch-free output updates, overvoltage-tolerant 5.5 V inputs, -40 °C to +125 °C operation, and SO16 package compatibility with legacy PCB footprints.

Technical Context

The device implements two synchronized but independently clocked 8-stage registers: a shift register accepting serial data on SHCP rising edges and a storage register capturing parallel outputs on STCP rising edges. Cascading is enabled via Q7S serial output and DS input, with no internal feedback path between registers.

Its IOFF circuit disables outputs during power-down to prevent backflow current, while Schmitt-trigger inputs tolerate slow-rising control signals. The design complies with JEDEC standards JESD8-7A, JESD8-5A, and JESD8-C/JESD36 across 1.65–3.6 V supply ranges.

Key Specifications

Pinout & Package

74LVC594AD uses the SO16 plastic small outline package (SOT109-1), 16-pin, 3.9 mm body width, with standard 1.27 mm lead pitch and gull-wing leads suitable for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit shift register with storage register applications.

Compared with SN74HC595PWR and 74LVCH16374APAG, the 74LVC594AD uniquely combines serial cascade capability, IOFF protection, and 5.5 V input tolerance in a standard SO16 footprint - making it optimal for space-constrained, mixed-voltage, and power-sequenced applications.

Availability

74LVC594AD is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expanders, automotive body control modules, and consumer appliance UI panels requiring stable component supply across extended temperature ranges.

Supply support for 74LVC594AD 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 optimized for efficiency, reliability, and miniaturization in high-volume applications.

The 74LVC series targets low-voltage, low-power digital interfacing in portable, automotive, and industrial systems - emphasizing voltage flexibility, robust ESD performance, and extended temperature operation.

FAQ

Can 74LVC594AD operate with a 5 V supply?

No - the absolute maximum VCC is +6.5 V, but the recommended operating range is strictly 1.2 V to 3.6 V per datasheet Section 9. Applying 5 V to VCC exceeds specification and risks permanent damage. However, inputs tolerate up to 5.5 V, enabling safe connection to 5 V microcontrollers while powering the IC from 3.3 V.

What is the purpose of separate SHR and STR pins?

SHR asynchronously clears only the shift register (stages holding incoming serial bits), while STR clears only the storage register (driving Q0–Q7 outputs). This separation allows independent control - for example, resetting output states without losing buffered serial data, or clearing shift data mid-transfer without affecting active outputs.

How does the IOFF feature function during power-down?

When VCC drops to 0 V, the IOFF circuit forces all outputs (Q0–Q7, Q7S) into high-impedance state regardless of input levels. This prevents reverse current flow from powered downstream circuits (e.g., 5 V LED drivers) into the unpowered IC, protecting both devices during hot-swap or partial-system shutdown sequences.

Is the SO16 package (SOT109-1) RoHS compliant and lead-free?

Yes - the 74LVC594AD in SO16 packaging conforms to RoHS Directive 2011/65/EU and is manufactured with lead-free terminations and halogen-free molding compound. The SOT109-1 package outline documentation confirms compliance with JEDEC MS-012 and IPC-7351B standards for surface-mount assembly.