Texas Instruments SN74HCS365QDRQ1

Overview

SN74HCS365QDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified hex buffer and line driver IC with Schmitt-trigger inputs and dual 3-state output enables (OE1, OE2). It operates from 2 V to 6 V, delivers ±7.8-mA drive at 6 V, features typical ICC of 100 nA, and supports noise-immune signal conditioning in engine control units and body electronics.

For engineers reviewing the SN74HCS365QDRQ1 datasheet, SN74HCS365QDRQ1 pinout, SN74HCS365QDRQ1 application, or SN74HCS365QDRQ1 equivalent, key selection criteria include its dual active-low 3-state control architecture, hysteresis of 0.6–1.6 V across supply range, 4–11 ns propagation delay, and wettable-flank WQFN-16 package for automated optical inspection.

Technical Context

The SN74HCS365QDRQ1 implements six independent noninverting buffers, each with Schmitt-trigger input thresholds (VT+ = 2.1–4.2 V, VT− = 1.2–3.0 V at 6 V) enabling robust operation with slow-rising or noisy signals. Its dual-gated 3-state outputs enter high-impedance mode when either OE1 or OE2 is high, supporting flexible bus arbitration in automotive serial interfaces.

It uses balanced CMOS push-pull outputs capable of sourcing/sinking up to ±7.8 mA at 6 V while maintaining VOL ≤ 0.33 V and VOH ≥ 5.4 V under load. Input leakage remains ≤ ±100 nA, and power dissipation capacitance is 20 pF per gate - critical for low-noise, low-power domain isolation in 12 V vehicle systems.

Key Specifications

Pinout & Package

SN74HCS365QDRQ1 is packaged in a 16-pin wettable-flank WQFN (WBQB), 3.60 mm × 2.60 mm, with exposed thermal pad (connected to GND or left floating). The package supports AOI-compatible side-fillet formation for automotive-grade solder joint reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex buffer applications.

Compared with SN74HCS365PWQ1 and SN74HCS365DQ1, SN74HCS365QDRQ1 offers superior thermal performance (RθJB = 66.4°C/W), AOI-ready wettable flanks, and smallest board area - making it optimal for new-generation compact, high-reliability automotive modules where solder joint inspection and thermal management are critical.

Availability

SN74HCS365QDRQ1 is available at Aetrix Electronics and suitable for engine control units, body electronics modules, and ADAS sensor interfaces requiring stable component supply across automotive production lifecycles.

Supply support for SN74HCS365QDRQ1 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 automotive-grade logic solutions with over 50 years of automotive qualification experience.

The SN74HCS365QDRQ1 belongs to TI's HCS logic family - designed specifically for noise-immune, low-power signal buffering in harsh automotive environments where reliability, ESD robustness, and AEC-Q100 compliance are mandatory.

FAQ

What is the maximum capacitive load SN74HCS365QDRQ1 can drive while meeting datasheet timing specs?

The SN74HCS365QDRQ1 is characterized for CL = 50 pF in switching specifications. Driving loads >50 pF increases propagation delay and transition time beyond guaranteed limits - for example, tpd rises from 11 ns to >20 ns at 100 pF. To maintain timing integrity in ADAS clock distribution, keep total load ≤50 pF using short traces and minimal fanout. SN74HCS365QDRQ1 datasheet Section 6.6 confirms this limit.

Does SN74HCS365QDRQ1 support mixed-voltage interfacing between 3.3 V and 5 V domains?

Yes - SN74HCS365QDRQ1 operates from 2 V to 6 V and has CMOS-compatible input thresholds that scale with VCC. At 3.3 V supply, VT+ ≈ 1.7–2.2 V and VT− ≈ 0.9–1.4 V; at 5 V, VT+ ≈ 2.5–3.2 V. This allows reliable recognition of 3.3 V logic HIGHs when powered from 5 V, and vice versa, provided VI stays within 0–VCC. SN74HCS365QDRQ1 avoids level-shifter components in gateway ECUs.

How should unused inputs be terminated on SN74HCS365QDRQ1?

Unused inputs on SN74HCS365QDRQ1 must be tied to VCC or GND - never left floating - to prevent undefined logic states and increased ICC. A 10-kΩ pull-up or pull-down resistor is recommended for flexibility; direct connection is acceptable if permanently fixed. Section 9.2.1.2 of the SN74HCS365QDRQ1 datasheet mandates this for AEC-Q100 compliance and noise immunity.

Can SN74HCS365QDRQ1 outputs be paralleled for higher drive strength?

Yes - two or more channels of SN74HCS365QDRQ1 with identical A inputs and OE states can be wired in parallel to double or triple output current capability (e.g., 15.6 mA at 6 V). Ensure matched trace lengths and simultaneous enable control. This technique is validated in SN74HCS365QDRQ1 Application Report SCLA007 for driving high-capacitance display buses.

Is the thermal pad on SN74HCS365QDRQ1 required to be connected to GND?

No - the thermal pad on SN74HCS365QDRQ1 may be connected to GND or left electrically floating, as stated in Pin Functions table (Section 5). TI recommends GND connection to improve thermal dissipation (RθJB drops to 66.4°C/W) and reduce EMI, but floating is acceptable if board layout constraints prohibit grounding. SN74HCS365QDRQ1 mechanical drawings confirm both options are qualified.