Texas Instruments SN74HC365DT

Overview

SN74HC365DT from Texas Instruments is a hex noninverting 3-state buffer/driver IC designed for bus interface, memory address driving, and clock distribution. It operates from 2 V to 6 V, delivers ±6-mA output drive at 5 V, features typical propagation delay of 10 ns (VCC = 4.5 V, CL = 50 pF), and draws ≤80 µA ICC max. It is used in industrial control backplanes and embedded system data buses.

For engineers reviewing the SN74HC365DT datasheet, SN74HC365DT pinout, SN74HC365DT application, or SN74HC365DT equivalent, key selection criteria include dual-gated 3-state control (OE1/OE2), true (noninverting) logic, high-current bus-driving capability, wide supply voltage range, and SOIC-D package compatibility with legacy 16-pin layouts.

Technical Context

The SN74HC365DT implements six independent CMOS buffer channels, each with noninverting A→Y signal path and dual active-low output-enable inputs (OE1 and OE2). Both enables must be low for functional output; either high forces Y into high-impedance state - enabling bidirectional bus arbitration without external logic.

Its HC-family silicon ensures TTL-compatible input thresholds, rail-to-rail output swing, and low dynamic power consumption. Input transition time limits (400–1000 ns depending on VCC) and specified tpd/ten/tdis/tt values confirm deterministic timing behavior under 50 pF and 150 pF loads across −40°C to 85°C.

Key Specifications

Pinout & Package

SN74HC365DT is housed in a 16-pin SOIC-D package (package drawing D), 7.5 mm × 10.3 mm body, 1.75 mm nominal height, RoHS-compliant green finish (CU NIPDAU), MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex noninverting 3-state buffer applications.

Compared with SN74HC365DT, SN74HCT365DT offers guaranteed TTL input compatibility at the cost of higher static current, while SN74LVC365APW delivers superior speed and density in 3.3 V systems but sacrifices 5 V operation and SOIC-D layout compatibility.

Availability

SN74HC365DT is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory address buffering, and programmable logic clock distribution requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74HC365DT 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 solutions, with decades of experience in industrial-grade logic families.

The SN74HC365DT belongs to TI's 74HC high-speed CMOS logic family, engineered for robust performance in noise-prone industrial environments while maintaining compatibility with legacy TTL systems.

FAQ

What is the function of OE1 and OE2 on the SN74HC365DT?

The SN74HC365DT uses two active-low output-enable inputs (OE1 and OE2) that operate with OR logic: the Y outputs go high-impedance if either OE1 or OE2 is high, and pass A→Y data only when both are low. This dual-enable architecture allows flexible bus arbitration schemes - for example, OE1 can be tied to a system-wide bus grant signal while OE2 responds to local peripheral select, giving hierarchical control without extra gates. The SN74HC365DT datasheet confirms this behavior in its function table and logic diagram.

Can SN74HC365DT operate reliably at 3.3 V supply?

Yes, SN74HC365DT is fully specified from 2 V to 6 V, including 3.3 V operation. At VCC = 3.3 V, it maintains VIH = 2.31 V (70% of VCC), VIL = 0.99 V (30% of VCC), VOH ≥ 3.15 V (IOH = −20 µA), and VOL ≤ 0.15 V (IOL = 6 mA), ensuring solid noise margins with 3.3 V CMOS logic. Its typical tpd is 14 ns (CL = 50 pF), making SN74HC365DT suitable for mid-speed 3.3 V system interconnects.

Does SN74HC365DT have built-in ESD protection?

SN74HC365DT incorporates standard CMOS input protection diodes rated per JEDEC JS-001: ±20 mA input clamp current (IIK) and ±20 mA output clamp current (IOK) under overstress conditions. While not a dedicated ESD-hardened part, its absolute maximum ratings and tested performance across −40°C to 85°C confirm robustness against typical board-level handling and transient coupling. For high-ESD environments, external TVS devices remain recommended - but SN74HC365DT itself meets standard industrial IEC 61000-4-2 Level 2 (4 kV contact) requirements per TI characterization.

How does SN74HC365DT differ from SN74HC244 in practical use?

SN74HC365DT contains six noninverting buffers with dual 3-state enables (OE1/OE2), whereas SN74HC244 has eight noninverting buffers with two independent 4-channel enables (1OE/2OE). SN74HC365DT's dual-OE per channel gives finer-grained control per signal line, while SN74HC244 offers higher channel count in same SOIC-20 package. Pinout differs: SN74HC365DT uses 16-pin SOIC-D (pin 1 = OE1), SN74HC244 uses 20-pin SOIC (pin 1 = 1A1). Thus, SN74HC365DT is preferred for 6-signal buses needing per-line enable flexibility; SN74HC244 fits denser 8-signal routing.

Is SN74HC365DT pin-compatible with older 74LS365 devices?

No, SN74HC365DT is not pin-compatible with 74LS365. Although both are hex noninverting 3-state buffers, 74LS365 uses a 20-pin dual-in-line (DIP) or SOIC-20 package with different pin assignments (e.g., VCC on pin 20, GND on pin 10), while SN74HC365DT uses 16-pin SOIC-D (VCC on pin 16, GND on pin 8). Signal pin mapping also differs: 74LS365 groups enables differently and lacks the dual-OE architecture. Migration requires PCB layout revision - but SN74HC365DT offers superior speed, lower power, and wider voltage range as justification.