Texas Instruments SNJ54HC165J

Overview

SNJ54HC165J from Texas Instruments is a military-grade 8-bit parallel-load shift register in CDIP-16 package, operating from 2 V to 6 V with typical propagation delay of 13 ns at 25°C and ±4-mA output drive at 5 V. It performs parallel-to-serial data conversion for GPIO expansion in embedded control systems, supporting cascaded configurations for multi-input keyboard or sensor interfaces.

For engineers reviewing the SNJ54HC165J datasheet, SNJ54HC165J pinout, SNJ54HC165J application, or SNJ54HC165J equivalent, this page delivers verified electrical specs, military temperature range (–55°C to 125°C), CDIP-16 mechanical dimensions (21.34 mm × 7.52 mm), and functional timing constraints including setup/hold times for SH/LD, CLK, and CLK INH inputs.

Technical Context

The SNJ54HC165J implements positive-edge-triggered serial shifting with gated clock logic: data shifts on rising CLK when SH/LD = HIGH and CLK INH = LOW, or on rising CLK INH when CLK = LOW. Parallel load occurs asynchronously when SH/LD = LOW, overriding all clock activity and loading A–H inputs directly into internal latches.

It features complementary QH and QH outputs, supports cascading via QH→SER interconnection, and includes clock-inhibit functionality that holds output state regardless of clock transitions - critical for deterministic timing in MIL-PRF-38535-compliant systems.

Key Specifications

Pinout & Package

SNJ54HC165J uses a 16-pin Ceramic Dual In-line Package (CDIP) with body size 21.34 mm × 7.52 mm and through-hole mounting. Pin numbering follows standard DIP convention with Pin 1 at top-left corner (notch side).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar parallel-load shift register applications.

Compared with SN74HC165N, SNJ54HC165J adds military temperature range and process screening but increases cost and lead time; compared with SNJ54LS165J, it offers wider voltage range, lower power, faster speed, and enhanced clock control - making it superior for modern mixed-voltage, low-power, and safety-critical designs.

Availability

SNJ54HC165J is available at Aetrix Electronics and suitable for aerospace control systems, defense electronics, industrial PLCs, and ruggedized human-machine interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54HC165J 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic ICs, with decades of heritage in high-reliability military and space-grade components.

The SNJ54HC165J belongs to TI's military logic family designed for applications demanding guaranteed performance under extreme environmental stress, including aerospace flight controls, missile guidance subsystems, and hardened ground equipment.

FAQ

What is the maximum clock frequency supported by SNJ54HC165J?

The SNJ54HC165J supports up to 50 MHz typical clock frequency at VCC = 4.5 V and TA = 25°C. At full military temperature range (–55°C to +125°C), maximum fclock drops to 21 MHz (VCC = 4.5 V) per SN54HC165 specifications. This defines the upper bound for serial data throughput in real-time monitoring applications using SNJ54HC165J.

Does SNJ54HC165J support cascading with other shift registers?

Yes, SNJ54HC165J supports seamless cascading: connect QH of one device to SER of the next, while sharing CLK, SH/LD, and CLK INH lines. This allows building N×8-bit input expanders using multiple SNJ54HC165J units - a technique validated in TI's application notes for keyboard and sensor array interfaces.

What is the purpose of the CLK INH pin on SNJ54HC165J?

The CLK INH pin on SNJ54HC165J halts all clock-driven state changes when driven HIGH, freezing QH/QH outputs regardless of CLK activity. This enables precise timing control - for example, holding output stable during bus arbitration or preventing spurious shifts during power-up sequences in systems using SNJ54HC165J.

How does SNJ54HC165J differ from commercial SN74HC165 variants?

SNJ54HC165J differs from SN74HC165 in three key ways: it is screened to MIL-PRF-38535 standards, operates from –55°C to +125°C (vs –40°C to +125°C), and uses a hermetically sealed CDIP package. All logic functionality, pinout, and DC/AC specs remain identical - making SNJ54HC165J a drop-in replacement where military reliability is mandated.

Can SNJ54HC165J operate at 3.3 V supply voltage?

Yes, SNJ54HC165J is fully specified for operation at 3.3 V (within its 2 V to 6 V range). At VCC = 3.3 V, it delivers guaranteed VOH ≥ 2.97 V and VOL ≤ 0.33 V under 4-mA load, ensuring robust interfacing with 3.3-V microcontrollers and FPGAs - a key advantage over 5-V-only alternatives like SNJ54LS165J when using SNJ54HC165J in mixed-voltage systems.