Texas Instruments SN74HCS365QWBQBRQ1

Overview

SN74HCS365QWBQBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive hex buffer and line driver with Schmitt-trigger inputs and dual 3-state enable (OE1/OE2). It operates from 2 V to 6 V, delivers ±7.8 mA output drive at 6 V, and features typical ICC of 100 nA - enabling robust signal conditioning in noisy engine control or body electronics modules.

For engineers reviewing the SN74HCS365QWBQBRQ1 datasheet, SN74HCS365QWBQBRQ1 pinout, SN74HCS365QWBQBRQ1 application, or SN74HCS365QWBQBRQ1 equivalent, key selection criteria include its wettable-flank WQFN-16 package, Schmitt-trigger hysteresis (ΔVT = 0.6–1.6 V), 3-state timing (tdis ≤ 16 ns at 6 V), and automotive-grade thermal performance (RθJA = 97.3°C/W).

Technical Context

This device implements six independent CMOS buffers with balanced push-pull outputs and dual-gated 3-state control: OE1 and OE2 are active-low enables - either high forces all Y outputs into high-impedance. Its Schmitt-trigger inputs provide hysteresis (VT+ − VT−) ranging from 0.2 V to 1.6 V across supply voltages, enabling reliable operation with slow-switching or noisy signals such as mechanical switch debouncing or sensor interface lines.

The SN74HCS365QWBQBRQ1 uses standard CMOS logic architecture with input leakage current ≤ ±1 µA and output drive capability specified at ±6 mA (4.5 V) and ±7.8 mA (6 V). Its propagation delay is 4–11 ns over 2–6 V, and it supports full-rail input/output voltage swing (0 to VCC) with VOH ≥ VCC − 0.1 V and VOL ≤ 0.33 V under load.

Key Specifications

Pinout & Package

The SN74HCS365QWBQBRQ1 is housed in a 3.60 mm × 2.60 mm wettable-flank WQFN-16 package (WBQB), optimized for automated optical inspection (AOI) and thermal performance (RθJA = 97.3°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCS365PWQ1 and SN74HCS365DQ1, the SN74HCS365QWBQBRQ1 offers superior thermal efficiency (97.3°C/W), AOI-ready wettable flanks, and smallest footprint - making it optimal for high-density, high-reliability automotive modules where thermal margin and automated inspection are critical.

Availability

SN74HCS365QWBQBRQ1 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera interfaces, and infotainment display subsystems requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for SN74HCS365QWBQBRQ1 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 ICs, with decades of automotive qualification expertise and broad AEC-Q100 portfolio coverage.

The SN74HCS365QWBQBRQ1 belongs to TI's HCS logic family - designed specifically for automotive signal integrity applications requiring noise-immune buffering, low-power 3-state control, and robust packaging for harsh environments.

FAQ

What is the maximum capacitive load the SN74HCS365QWBQBRQ1 can drive while maintaining specified timing?

The SN74HCS365QWBQBRQ1 is characterized for CL = 50 pF in its switching specifications. While it can drive larger loads, timing parameters (tpd, ten, tdis) are guaranteed only up to 50 pF. Exceeding this may increase propagation delay and transition time beyond datasheet limits - for example, tpd rises from 4 ns (typ) at 50 pF to >8 ns at 100 pF per TI characterization data. Always verify signal integrity with oscilloscope measurements when driving >50 pF.

Does the SN74HCS365QWBQBRQ1 support true bidirectional data flow?

No, the SN74HCS365QWBQBRQ1 is a unidirectional hex buffer: each channel passes noninverted data from A input to Y output only. It lacks internal direction control or bus transceiver logic. For bidirectional applications like I²C or SPI bus extension, a dedicated transceiver such as the SN74LVC245A-Q1 is required - the SN74HCS365QWBQBRQ1 serves strictly as a one-way signal conditioner or line driver.

How should unused inputs be terminated on the SN74HCS365QWBQBRQ1?

Unused inputs on the SN74HCS365QWBQBRQ1 must be tied to a valid logic level - either VCC or GND - using a direct connection or pull-up/pull-down resistor. A 10-kΩ resistor is recommended if flexibility is needed. Leaving inputs floating risks undefined output states and increased ICC due to input stage oscillation. This requirement applies regardless of Schmitt-trigger architecture - TI explicitly mandates termination in Section 9.2.1.2 of the datasheet.

Can both OE1 and OE2 be used simultaneously to achieve partial channel enablement?

Yes - OE1 controls channels Y1–Y3, and OE2 controls Y4–Y6. When OE1 = L and OE2 = H, only Y1–Y3 are active; when OE1 = H and OE2 = L, only Y4–Y6 are active; when both are L, all six outputs are enabled. This dual-enable architecture allows selective bus segmentation in multi-peripheral systems - for instance, enabling camera sensor clocks (Y1–Y3) while holding display interface lines (Y4–Y6) in high-Z during initialization - a feature not supported by single-OE alternatives like SN74HCS125Q1.

Is the thermal pad of the SN74HCS365QWBQBRQ1 required to be soldered to GND?

The exposed thermal pad on the SN74HCS365QWBQBRQ1 may be connected to GND or left floating - TI specifies "Do not connect to any other signal or supply." Soldering to GND improves thermal resistance (RθJB drops to 66.4°C/W) and mechanical reliability but is not electrically mandatory. However, for automotive applications subject to vibration and thermal cycling, TI strongly recommends GND connection to maximize solder joint integrity and long-term thermal stability of the SN74HCS365QWBQBRQ1.