Texas Instruments SN74HCS365DR

Overview

SN74HCS365DR from Texas Instruments is a hex noninverting buffer/line driver with Schmitt-trigger inputs and dual 3-state outputs (OE1/OE2), operating from 2 V to 6 V. It delivers ±7.8-mA output drive at 6 V, supports –40°C to +125°C ambient operation, and features 100 nA typical ICC - enabling robust signal conditioning in noisy industrial bus interfaces.

For engineers reviewing the SN74HCS365DR datasheet, SN74HCS365DR pinout, SN74HCS365DR application, or SN74HCS365DR equivalent, key selection criteria include Schmitt-trigger hysteresis (ΔVT ≥ 0.6 V at 6 V), dual-gated 3-state control logic, SOIC-16 package thermal resistance (RθJA = 122.2°C/W), and compatibility with slow-switching or debounced mechanical inputs.

Technical Context

The SN74HCS365DR implements six independent CMOS push-pull buffers, each with Schmitt-trigger input architecture providing hysteresis (ΔVT = 0.6–1.6 V across 2–6 V supply) to reject noise and tolerate slow edges. Its dual active-low output-enable inputs (OE1, OE2) allow grouped 3-state control: either high disables all six outputs simultaneously into high-impedance mode.

It uses balanced CMOS output stages capable of sourcing/sinking symmetric currents (±7.8 mA at 6 V), with propagation delay as low as 4 ns (typical) at 6 V and CL = 50 pF. Input leakage remains ≤ ±1 µA at 6 V, and power dissipation capacitance is 20 pF per gate - supporting low-noise, low-power signal routing in mixed-signal embedded systems.

Key Specifications

Pinout & Package

SN74HCS365DR is supplied in a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm, with standard 1.27-mm pitch and gull-wing leads. Thermal resistance is RθJA = 122.2°C/W, supporting continuous operation at full drive strength in compact industrial layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCS365DR, SN74HCS367DR provides functional equivalence with polarity inversion, while SN74LV365ADBR trades Schmitt noise immunity for wider low-voltage compatibility - making SN74HCS365DR the sole choice for robust signal conditioning in harsh industrial settings.

Availability

SN74HCS365DR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body-control modules, and PLC I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74HCS365DR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74HCS365DR belongs to TI's HCS logic family - designed for high-noise immunity, low-power operation, and extended temperature reliability in mission-critical embedded control systems.

FAQ

What is the function of OE1 and OE2 on the SN74HCS365DR?

OE1 and OE2 are active-low output-enable inputs that independently control groups of outputs. When either is high, all six Y outputs enter high-impedance mode. Both must be low for A1–A6 to pass through to Y1–Y6. This dual-enable structure allows flexible bus segmentation - for example, OE1 can gate channels 1–3 while OE2 gates 4–6, enabling partial bus isolation without additional logic.

Does the SN74HCS365DR require external pull-up or pull-down resistors on unused inputs?

No - unused inputs on the SN74HCS365DR may be left unconnected because its Schmitt-trigger inputs have high impedance and do not draw significant current. However, TI recommends tying unused inputs to VCC or GND for predictable logic states and to prevent floating nodes from coupling noise. A 10-kΩ resistor is typical if dynamic control is needed, but direct connection is acceptable for static termination.

Can the SN74HCS365DR drive a 100-pF load reliably?

The SN74HCS365DR is characterized for CL ≤ 50 pF in its switching specifications. Driving 100 pF will increase propagation delay (e.g., from 4 ns to ~8 ns at 6 V) and may degrade edge rates, but will not damage the device. For guaranteed timing compliance, add a series damping resistor (e.g., 22–33 Ω) near the output to suppress ringing - as validated in TI's Application Curve (Figure 9-2) for loads >50 pF.

What is the minimum input transition rate supported by the SN74HCS365DR?

The SN74HCS365DR has no minimum input transition rate due to its Schmitt-trigger inputs. It reliably accepts input edges as slow as 100 µs rise/fall time - confirmed by hysteresis (ΔVT ≥ 0.6 V at 6 V) that prevents oscillation during slow crossings of VT+ and VT− thresholds. This makes the SN74HCS365DR ideal for debouncing mechanical switches or interfacing with thermistor-based comparators.

How does the SN74HCS365DR handle ESD events in system-level design?

The SN74HCS365DR is rated for ±4000 V HBM and ±1500 V CDM per JEDEC standards, providing robustness against handling and board-level ESD. Its internal clamp diodes (IIK/IOK ±20 mA) safely shunt transient current to VCC or GND when input/output voltages exceed absolute maximum ratings. To maintain this protection, ensure PCB layout includes low-inductance paths to VCC/GND and avoids routing unprotected traces near connectors.