Nexperia USA Inc. 74HCT597D-Q100J

Overview

74HCT597D-Q100 from Nexperia is an AEC-Q100 Grade 1 qualified 8-bit parallel-in/serial-out shift register with input flip-flops, featuring separate storage and shift registers both edge-triggered on rising clock edges. It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, includes asynchronous master reset (MR), parallel load (PL), and direct shift register clear - used in automotive body control modules for serializing sensor inputs or LED driver configuration data.

For engineers reviewing the 74HCT597D-Q100 datasheet, 74HCT597D-Q100 pinout, 74HCT597D-Q100 application, or 74HCT597D-Q100 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V), propagation delay ≤60 ns (VCC = 4.5 V), SO16 package thermal derating (12.4 mW/K above 110 °C), and automotive-grade latch-up immunity (>100 mA per JESD78 Class II Level B).

Technical Context

The device implements a two-stage architecture: an 8-bit parallel storage register (clocked by STCP) feeds a serial shift register (clocked by SHCP), enabling synchronized capture followed by controlled serial output. Both clocks are positive-edge-triggered, and the MR input asynchronously clears the shift register while PL loads data from D0–D7 into the shift register directly.

Input clamp diodes allow interfacing with voltages exceeding VCC when used with current-limiting resistors. The TTL-level input specification (74HCT variant) ensures compatibility with legacy 5 V logic families without level-shifting, while maintaining CMOS power efficiency and noise immunity up to 125 °C junction temperature.

Key Specifications

Pinout & Package

74HCT597D-Q100 uses the SOT109-1 (SO16) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm pitch, with gull-wing leads and exposed pad not present. Thermal resistance θJA = 70 K/W (typical); total power dissipation derates linearly at 12.4 mW/K above 110 °C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC597D-Q100 and SN74LV597AQPWRQ1, the 74HCT597D-Q100 uniquely balances TTL input compatibility, automotive temperature range, and SO16 footprint - making it optimal for legacy 5 V automotive ECUs where signal source impedance and voltage margins favor HCT logic thresholds.

Availability

74HCT597D-Q100 is available at Aetrix Electronics and suitable for automotive body control units, instrument cluster displays, engine control modules, and ADAS camera configuration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT597D-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 logic, analog, and MOSFET solutions optimized for automotive, industrial, and consumer applications with emphasis on reliability and energy efficiency.

The 74HCT597-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to replace legacy 74-series shift registers in safety-critical vehicle subsystems while meeting AEC-Q100 Grade 1 requirements.

FAQ

What is the minimum pulse width required on SHCP for reliable operation at 125 °C?

At VCC = 4.5 V and TA = +125 °C, the minimum SHCP pulse width is 20 ns (HIGH) and 20 ns (LOW), per Table 7. This ensures sufficient setup/hold margin for internal flip-flop metastability avoidance. Operation below this width risks skipped shifts or corrupted output, especially under voltage droop conditions common in automotive transients.

Can PL and MR be asserted simultaneously without violating timing constraints?

Yes - PL (active LOW) and MR (active LOW) may be asserted concurrently. MR takes precedence: when MR = LOW, the shift register is cleared immediately and Q = LOW, overriding any PL action. No timing violation occurs because MR is asynchronous and does not depend on clock edges. However, PL should be deasserted before releasing MR to avoid race conditions during recovery.

Is the DS input sampled on the same SHCP edge that shifts existing data?

Yes - DS is sampled on the rising edge of SHCP and shifted into the LSB position (Q0) simultaneously with the right-shift of all other bits. The new DS value appears at Q on the *next* SHCP edge. This behavior is confirmed in Table 3 (Function table) and Fig. 6 timing diagram, where DS-to-Q propagation delay is measured from SHCP to Q output transition.

Does the 74HCT597D-Q100 support hot insertion or live swapping in powered systems?

No - the device lacks Ioff protection or power-off isolation. Applying signals to Dn, DS, or control pins while VCC = 0 V can forward-bias internal clamp diodes, causing excessive current flow and potential damage. Always power VCC before applying input signals, and follow Nexperia's recommended power sequencing: VCC first, then inputs; reverse order for shutdown.