Nexperia USA Inc. 74AHC594D-Q100,118

Overview

74AHC594D-Q100 from Nexperia is an automotive-qualified 8-bit serial-in, parallel-out shift register with independent storage register, dual positive-edge clocks (SHCP/STCP), active-low reset inputs (SHR/STR), and cascading serial output Q7S. It operates from 2.0 V to 5.5 V, supports -40 °C to +125 °C, and delivers ≤10.6 ns propagation delay at 3.3 V (CL = 50 pF). It serves as a data serialization and latching interface in automotive body control modules requiring synchronized I/O expansion.

For engineers reviewing the 74AHC594D-Q100 datasheet, 74AHC594D-Q100 pinout, 74AHC594D-Q100 application, or 74AHC594D-Q100 equivalent, this device is selected for high-reliability serial-to-parallel conversion where independent clocking of shift and storage stages prevents metastability during asynchronous load timing, and Schmitt-trigger inputs ensure robust noise immunity in noisy vehicle environments.

Technical Context

The device implements two synchronous, edge-triggered registers: an 8-stage shift register accepting serial data on DS with SHCP, and an 8-bit D-type storage register capturing shifted data on STCP. Both registers feature dedicated asynchronous active-low clears (SHR and STR), enabling independent initialization without affecting the other stage.

Its CMOS-level input thresholds (VIH ≥ 3.85 V at VCC = 5.5 V), overvoltage-tolerant inputs (up to 5.5 V), and balanced propagation delays between SHCP→Q7S and STCP→Qn support deterministic timing in mixed-voltage automotive subsystems - especially when cascading multiple units via Q7S while maintaining clean parallel output staging.

Key Specifications

Pinout & Package

Package: SO16 (SOT109-1), plastic small outline, 16-pin, 3.9 mm body width, lead pitch 1.27 mm.

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 74AHCT594D-Q100, the 74AHC594D-Q100 offers higher noise immunity and wider VCC compatibility but requires stricter input voltage compliance; versus SN74HC595QPWRQ1, it provides superior timing control and daisy-chain capability at the cost of slightly higher design complexity.

Availability

74AHC594D-Q100 is available at Aetrix Electronics and suitable for automotive body control units, LED matrix lighting systems, instrument cluster backlights, and power distribution modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHC594D-Q100 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, high-reliability logic, analog, and discrete components optimized for automotive, industrial, and consumer applications.

The 74AHC594-Q100 series belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for robust serial-to-parallel data conversion in harsh environments where AEC-Q100 Grade 1 reliability and precise timing control are mandatory.

FAQ

Can 74AHC594D-Q100 operate reliably at 125 °C junction temperature?

Yes. The device is qualified per AEC-Q100 Grade 1 for operation from -40 °C to +125 °C ambient temperature. Thermal derating curves confirm sustained functionality at full rated speed (170 MHz) up to +125 °C ambient when mounted on a 2-layer PCB with 1 oz copper and standard thermal vias - validated per JEDEC JESD51-2.

What happens if SHCP and STCP are tied together?

When SHCP and STCP are connected, the shift register advances one bit ahead of the storage register on each clock edge. This causes Q7S to reflect the prior stage's value, and parallel outputs update one cycle after data entry - a known behavior documented in the function table and used intentionally in certain pipeline architectures.

Is Q7S output compatible with 3.3 V logic when VCC = 5 V?

Yes. Q7S is a buffered CMOS output with VOH ≥ 4.4 V (IO = -50 μA) and VOL ≤ 0.36 V (IO = 8 mA) at VCC = 5 V, making it fully compatible with 3.3 V logic inputs when used with appropriate current limiting or series termination - verified in dynamic characterization tests.

Does the device support hot insertion or live swapping?

No. The 74AHC594D-Q100 lacks hot-swap protection circuitry. Applying VCC before GND or sequencing control signals before power stabilization may cause latch-up or undefined output states. Power-on reset sequencing per manufacturer guidelines is required for automotive deployment.