Texas Instruments 74AC11245DW

Overview

74AC11245DW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous two-way data communication between A and B buses in industrial and embedded systems. It supports bidirectional noninverted data flow controlled by DIR, enables bus isolation via OE, operates from –40°C to 85°C, and uses EPIC 1-μm CMOS technology for latch-up immunity up to 500 mA at 125°C.

For engineers reviewing the 74AC11245DW datasheet, 74AC11245DW pinout, 74AC11245DW application, or 74AC11245DW equivalent, key selection criteria include direction-control logic behavior, 3-state output timing (tPLH/tPHL ≤ 9.5 ns at 5 V), SOIC-24 package compatibility, and ±24 mA drive capability across 3–5.5 V supply range.

Technical Context

This device implements dual-directional bus interface logic using complementary CMOS circuitry with separate DIR and OE controls. Its flow-through pin architecture minimizes trace crossing on PCBs, while center-placed VCC and GND pins reduce high-speed switching noise. The EPIC process ensures robust ESD tolerance and latch-up immunity without external protection components.

Operation requires only two control signals: DIR selects data path direction (A→B or B→A), and OE enables/disables all outputs simultaneously. When OE is high, outputs enter high-impedance state regardless of DIR, fully isolating both buses - a critical feature for shared-bus arbitration and hot-swap readiness.

Key Specifications

Pinout & Package

74AC11245DW is housed in a 24-pin SOIC (DW) package with 300-mil width, JEDEC MS-013 compliant, RoHS-compliant green finish (CU NIPDAU), and moisture sensitivity level 1 (260°C reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bus transceiver applications.

Compared with 74AC11245DW, SN74ACT125N offers higher speed (tPD = 2.5 ns) but no direction control or bus isolation, while 74LVC245APW reduces package size and quiescent current but sacrifices 5 V interoperability and latch-up immunity - making 74AC11245DW uniquely suited for robust, mixed-voltage industrial bus interfaces.

Availability

74AC11245DW is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, legacy system bus extensions, and automotive diagnostic interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AC11245DW 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 over 90 years of innovation in industrial, automotive, and communications markets.

The 74AC logic family delivers advanced CMOS performance with TTL-compatible input thresholds and enhanced latch-up immunity - engineered specifically for high-reliability industrial control, instrumentation, and legacy-system upgrade applications.

FAQ

What is the maximum operating supply voltage for the 74AC11245DW?

The 74AC11245DW supports a supply voltage range of 3 V to 5.5 V, with absolute maximum rating of 7 V. Operation above 5.5 V is not recommended and may cause permanent damage. At 5.5 V, it delivers ±24 mA output drive and maintains full timing specifications across –40°C to +85°C.

Does the 74AC11245DW support bidirectional data transfer without external logic?

Yes, the 74AC11245DW natively supports bidirectional data transfer using its dedicated DIR (direction control) input. When DIR = H, data flows from A bus to B bus; when DIR = L, data flows from B bus to A bus - all without requiring additional gates or microcontroller intervention.

How does the 74AC11245DW achieve bus isolation?

The 74AC11245DW achieves full bus isolation through its active-low OE (output enable) input. When OE is driven high, all A and B port outputs enter a high-impedance state with leakage current ≤ ±5 μA, electrically disconnecting both buses regardless of DIR state or input levels.

What package type and dimensions does the 74AC11245DW use?

The 74AC11245DW uses a 24-pin SOIC (DW) package per JEDEC MS-013, measuring 15.4 mm × 7.5 mm × 2.35 mm. It features 300-mil width, gull-wing leads, and RoHS-compliant green finish (CU NIPDAU) with MSL Level-1 rating for unlimited floor life at 260°C reflow.

Is the 74AC11245DW compatible with 3.3 V logic systems?

Yes, the 74AC11245DW operates down to 3 V supply and meets all AC/DC specifications at that voltage, including VIH = 2.1 V and VIL = 0.9 V - providing 1.2 V noise margin. Its 5.5 V max rating also allows safe interfacing with 3.3 V outputs driving 5 V-tolerant inputs in mixed-voltage designs.