Texas Instruments SN74ABT5403DW

Overview

SN74ABT5403DW from Texas Instruments is a 12-bit inverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It operates from 4.5 V to 5.5 V, supports –40°C to 85°C ambient temperature, delivers ±12 mA output drive, and integrates 25-Ω series output resistors to suppress overshoot/undershoot in high-speed digital systems.

For engineers reviewing the SN74ABT5403DW datasheet, SN74ABT5403DW pinout, SN74ABT5403DW application, or SN74ABT5403DW equivalent, key selection criteria include its dual active-low 3-state enable (OE1/OE2), inverted data path, low ground bounce (<1 V typical VOLP), and SOIC-28 package compatibility with legacy 5-V TTL and ABT logic buses.

Technical Context

This device implements a dual-gated 3-state control architecture using two active-low AND inputs (OE1 and OE2) - either high forces all 12 outputs into high-impedance, enabling precise bus arbitration. Its EPIC-II^B BiCMOS process delivers low power dissipation while maintaining TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2 V) and rail-to-rail output swing under load.

Each output features on-die 25-Ω series termination, eliminating external resistors for impedance matching on PCB traces up to ~10 cm. Electrical characteristics are specified across full industrial temperature range, with latch-up immunity exceeding 500 mA per JESD-17, and absolute maximum ratings including 7-V supply tolerance and –0.5 V to 5.5 V output voltage limits in powered-down states.

Key Specifications

Pinout & Package

SN74ABT5403DW is housed in a 28-pin plastic small-outline integrated circuit (SOIC) package (DW), 10.3 mm × 5.3 mm body size, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit inverting 3-state buffer applications.

Compared with SN74ABT240N and SN74LVC126APW, the SN74ABT5403DW uniquely combines 12-bit width, inverting logic, 5-V operation, and on-die 25-Ω termination - making it irreplaceable for compact, high-integrity 5-V memory and bus buffering without layout compromises.

Availability

SN74ABT5403DW is available at Aetrix Electronics and suitable for memory subsystem design, industrial bus interfacing, and legacy 5-V logic expansion requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for SN74ABT5403DW 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 heritage in high-reliability logic families.

The SN74ABT5403DW belongs to TI's ABT (Advanced BiCMOS Technology) logic series, engineered for high-speed, low-noise 5-V bus and memory interface applications in industrial and communications equipment.

FAQ

What is the function of the dual OE inputs on the SN74ABT5403DW?

The SN74ABT5403DW uses two active-low enable inputs (OE1 and OE2) wired as an AND gate: both must be low for outputs to drive; if either is high, all 12 outputs enter high-impedance state. This architecture enables flexible bus arbitration - for example, OE1 can be tied to a master enable while OE2 responds to peripheral select signals. The SN74ABT5403DW thus supports hierarchical 3-state control without external logic.

Does the SN74ABT5403DW require external series resistors for EMI suppression?

No. The SN74ABT5403DW integrates 25-Ω series resistors on each output, specifically designed to dampen edge-induced overshoot and undershoot on PCB traces. This eliminates the need for discrete 22–33 Ω resistors typically used in high-speed 5-V bus designs. Verified by TI's characterization, the SN74ABT5403DW achieves typical VOLP < 1 V and VOLV < 0.5 V at 5 V/25°C without external components.

Can the SN74ABT5403DW operate reliably at 4.5 V supply?

Yes. The SN74ABT5403DW is fully characterized from 4.5 V to 5.5 V per its recommended operating conditions. At V_CC = 4.5 V, it maintains guaranteed VOH ≥ 3.3 V (IOH = –1 mA) and VOL ≤ 0.8 V (IOL = 12 mA), ensuring noise margins >0.7 V with standard TTL loads. This makes the SN74ABT5403DW suitable for systems with marginal 5-V regulation or battery-backed 5-V rails.

What is the thermal performance of the SN74ABT5403DW in SOIC-28 package?

The SN74ABT5403DW in DW package has a junction-to-ambient thermal resistance (θ_JA) of 78°C/W under standard JEDEC test conditions. With typical ICC of 45 mA max at 5.5 V and outputs enabled, power dissipation remains below 250 mW - resulting in <20°C junction rise above ambient. No heatsink is required for continuous operation in free-air environments up to 85°C ambient.

Is the SN74ABT5403DW pin-compatible with older 74-series drivers like the 74LS640?

No. While functionally similar as an inverting 3-state octal/larger buffer, the SN74ABT5403DW is a 12-bit device in SOIC-28 (vs. 74LS640's 20-pin DIP/SOIC), with different pinout, dual OE inputs, and integrated termination. It is not a drop-in replacement. Direct substitution would require PCB redesign. The SN74ABT5403DW serves modern high-density layouts where its 12-bit width and on-die termination deliver superior signal integrity over legacy parts.