Nexperia USA Inc. 74HCT165D-Q100,118

Overview

74HCT165D-Q100 from Nexperia is an automotive-grade 8-bit parallel-in/serial-out shift register with TTL-compatible inputs, asynchronous parallel load (PL), synchronous serial shift (CP/CE), complementary Q7/Q7 outputs, and overvoltage-tolerant inputs up to 15 V - used in automotive body control modules for GPIO expansion via SPI-like interfaces.

For engineers reviewing the 74HCT165D-Q100 datasheet, 74HCT165D-Q100 pinout, 74HCT165D-Q100 application, or 74HCT165D-Q100 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (-40 °C to +125 °C), SO16 package compatibility, 5 V supply operation, propagation delay ≤51 ns at VCC = 4.5 V, and input level tolerance enabling high-to-low level shifting.

Technical Context

This device implements a static CMOS 8-stage shift register with dual-path output architecture: Q7 provides the MSB of the serial stream while Q7 delivers its logical complement. The PL input enables immediate parallel capture independent of clock edges, supporting burst data acquisition from sensors or switches.

Operation is controlled by edge-triggered CP (LOW-to-HIGH) and active-LOW CE - when CE is HIGH, CP is inhibited regardless of state. Input clamping supports 15 V overvoltage tolerance, allowing direct interfacing with 12 V automotive signals without external level-shifting circuitry.

Key Specifications

Pinout & Package

74HCT165D-Q100 uses the SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm pitch, gull-wing leads, JEDEC MS-012 compliant.

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 74HC165D-Q100, the 74HCT165D-Q100 offers guaranteed TTL input compatibility and superior 12 V transient resilience, while SN74LV165AQPWRQ1 provides faster operation at 3.3 V but sacrifices overvoltage protection - making the HCT variant optimal for cost-sensitive, mixed-signal automotive body electronics.

Availability

74HCT165D-Q100 is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC digital input modules, lighting control systems, and medical diagnostic equipment panels requiring stable component supply across extended temperature ranges.

Supply support for 74HCT165D-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, reliable components for automotive, industrial, and consumer applications, with leadership in logic, MOSFETs, and ESD protection.

This device belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for robust, low-power data serialization in harsh automotive environments - emphasizing AEC-Q100 compliance, wide temperature operation, and input overvoltage resilience.

FAQ

What is the maximum clock frequency supported by the 74HCT165D-Q100?

The 74HCT165D-Q100 supports a maximum clock frequency of 44 MHz at VCC = 4.5 V and CL = 15 pF, and 17 MHz at VCC = 4.5 V with CL = 50 pF. This is derived from tW (pulse width) and trec (recovery time) specifications in the datasheet, ensuring reliable setup/hold timing margins under automotive operating conditions.

Can the 74HCT165D-Q100 be used with a 3.3 V microcontroller?

No - the 74HCT165D-Q100 requires VCC = 4.5 V to 5.5 V and has TTL-compatible inputs (VIH ≥ 2.0 V), but its outputs swing rail-to-rail at 5 V and are not 3.3 V tolerant. Direct connection risks damaging 3.3 V MCU inputs; level-shifting circuitry or a 3.3 V–compatible alternative like SN74LV165AQPWRQ1 is required.

How does the PL (parallel load) pin interact with ongoing serial shift operations?

The PL pin operates asynchronously: when driven LOW, it immediately loads D0–D7 into the register regardless of CP or CE state, overriding any ongoing shift sequence. Once PL returns HIGH, normal serial shifting resumes on subsequent CP edges (if CE = LOW), with the newly loaded data appearing at Q7 after eight clocks.

Is the Q7 output truly complementary to Q7, or is it inverted logic only?

Q7 is the true logical complement of Q7 - both outputs are driven by the same internal flip-flop stage with matched propagation delays (tpd difference < 1 ns). This enables precise differential sampling and eliminates skew-related errors in noise-critical applications such as automotive CAN node status monitoring or safety interlock verification.