Nexperia USA Inc. 74HCT164D,653

Overview

74HCT164D,653 from Nexperia is an 8-bit serial-in/parallel-out shift register with TTL-compatible inputs, dual gated serial data inputs (DSA and DSB), asynchronous master reset (MR), and edge-triggered clock (CP) operating from 4.5 V to 5.5 V. It delivers 8 parallel outputs (Q0–Q7), supports -40 °C to +125 °C operation, and is used in LED display drivers, I/O expansion, and serial-to-parallel data conversion in industrial control systems.

For engineers reviewing the 74HCT164D,653 datasheet, 74HCT164D,653 pinout, 74HCT164D,653 application, or 74HCT164D,653 equivalent, key selection considerations include its TTL-level input compatibility, asynchronous MR behavior, CP-to-Q propagation delay (≤54 ns at VCC = 4.5 V), SO14 package thermal profile, and functional distinction from 74HC164 variants.

Technical Context

The device implements an 8-stage D-type flip-flop shift register with synchronous serial data loading via two logically AND-gated inputs (DSA and DSB), where either input can serve as an active-HIGH enable for the other. Clocking occurs on LOW-to-HIGH transitions of CP, and MR forces all Q outputs LOW independently of clock or data state.

Input clamping diodes allow interface to voltages exceeding VCC when used with current-limiting resistors. The design complies with JEDEC JESD8C (2.7–3.6 V) and JESD7A (2.0–6.0 V), and latch-up performance exceeds 100 mA per JESD78 Class II Level B.

Key Specifications

Pinout & Package

74HCT164D,653 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width. Pin 1 is DSA; pin 7 is GND; pin 8 is CP; pin 9 is MR; pin 14 is VCC.

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 74HC164D,653 and SN74LV164APWR, the 74HCT164D,653 uniquely combines TTL-level input compatibility, SO14 package compatibility with legacy layouts, and dual-gated serial inputs - making it optimal for retrofitting 5 V industrial controllers while preserving existing PCB land patterns and signal integrity margins.

Availability

74HCT164D,653 is available at Aetrix Electronics and suitable for LED display driver circuits, microcontroller I/O expansion modules, industrial serial data buffering, and legacy bus interface adapters requiring stable component supply across extended temperature ranges.

Supply support for 74HCT164D,653 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 specializing in high-performance, energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer applications.

The 74HCT164 belongs to Nexperia's industry-standard 74-series logic portfolio, designed specifically for robust, drop-in replacement of legacy TTL and CMOS shift registers in cost-sensitive, high-reliability embedded systems.

FAQ

What is the minimum setup time required for DSA/DSB relative to the CP rising edge?

At VCC = 4.5 V, the minimum setup time (tsu) for DSA and DSB is 12 ns before the LOW-to-HIGH CP transition. This ensures reliable sampling of serial data; violating this margin risks metastability or incorrect bit capture in the first flip-flop stage. The value is verified across -40 °C to +125 °C per Table 7 of the official Nexperia datasheet Rev. 11.

Can MR be asserted while CP is HIGH, and does it affect output timing?

Yes, MR is fully asynchronous and functions independently of CP state. When MR is pulled LOW, all Q outputs transition to LOW within tPHL (≤38 ns at VCC = 4.5 V) regardless of CP level or timing. No clock edge is required - this enables immediate, deterministic register clearing during fault conditions or system resets.

Is the SO14 package (SOT108-1) RoHS compliant and lead-free?

Yes, the 74HCT164D,653 in SO14 packaging meets RoHS Directive 2011/65/EU and is lead-free, with homogeneous material lead content < 0.1 wt%. Nexperia confirms full compliance in its product change notifications and material declarations, and the device carries the "Pb-free" marking per JEDEC standards.

How does the dual-input gating (DSA/DSB) improve system-level reliability?

The AND-gated DSA/DSB architecture prevents spurious data entry during bus contention or noise events: if DSB is held LOW, DSA transitions are ignored - enabling hardware-enforced data validity checks. This eliminates need for software handshaking or external enable logic, reducing BOM count and improving fault containment in noisy industrial environments.