Texas Instruments SN74ABT2240APWRE4

Overview

SN74ABT2240APWRE4 from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It features two independent 4-bit sections with separate active-low output-enable (OE) inputs, 25-Ω integrated series output resistors, 12 mA sink capability per output, and operates from 4.5 V to 5.5 V over –40°C to 85°C.

For engineers reviewing the SN74ABT2240APWRE4 datasheet, SN74ABT2240APWRE4 pinout, SN74ABT2240APWRE4 application, or SN74ABT2240APWRE4 equivalent, key selection criteria include its 3-state bus-driving capability, output-ground-bounce performance (<1 V typical), latch-up immunity (>500 mA), ESD robustness (>2000 V HBM), and compatibility with high-density PCB layouts using TSSOP-20 packaging.

Technical Context

This device implements a BiCMOS EPIC-II^B architecture to reduce power dissipation while maintaining TTL-compatible input thresholds and 5-V operation. Each of the eight outputs is individually controlled by one of two OE inputs and includes on-die 25-Ω series termination to suppress overshoot/undershoot without external components.

It supports symmetrical fan-out/fan-in behavior, with guaranteed 12 mA low-level drive and –24 mA high-level drive at V_CC = 5 V. Propagation delays range from 1 ns to 6.2 ns (t_PLH/t_PHL) under CL = 50 pF, and enable/disable times are specified down to 1.1 ns (t_PZH).

Key Specifications

Pinout & Package

TSSOP-20 package (PW), 6.5 mm × 4.4 mm × 1.2 mm height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT2240APWRE4, the DB and DW variants retain identical logic function, timing, and drive strength but differ in mechanical form factor, thermal resistance, and assembly compatibility-making them functional alternatives rather than pin-to-pin drop-ins due to distinct land patterns and solder joint geometry.

Availability

SN74ABT2240APWRE4 is available at Aetrix Electronics and suitable for memory buffering, bus interfacing, clock distribution, and legacy system expansion requiring stable component supply and long-term industrial-grade availability.

Supply support for SN74ABT2240APWRE4 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 ABT family-including SN74ABT2240APWRE4-is engineered for high-speed, low-noise 5-V bus interfacing in memory, computing, and instrumentation systems where signal integrity and reliability are critical.

FAQ

What is the maximum recommended operating voltage for SN74ABT2240APWRE4?

The absolute maximum supply voltage for SN74ABT2240APWRE4 is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this window may cause timing violations, increased ground bounce, or accelerated parametric drift. TI specifies all electrical characteristics-including t_PLH, V_OH, and I_OL-only within the 4.5–5.5 V band, and SN74ABT2240APWRE4 must be powered within this range for guaranteed compliance with datasheet performance.

Does SN74ABT2240APWRE4 require external pull-up resistors on its OE inputs?

Yes, SN74ABT2240APWRE4 requires external pull-up resistors on both 1OE and 2OE inputs to ensure outputs remain in high-impedance during power-up and power-down sequences. The minimum resistor value depends on the current-sinking capability of the driving source; TI recommends values ≥10 kΩ when driven by standard logic outputs. Without pull-ups, undefined OE states could cause bus contention or excessive ICC surge at turn-on.

Can SN74ABT2240APWRE4 drive a 50-pF capacitive load reliably?

Yes, SN74ABT2240APWRE4 is fully characterized for CL = 50 pF, with all switching parameters-including t_PLH (max 4.8 ns), t_PHL (max 5.4 ns), and t_PZH (max 5.2 ns)-guaranteed under that condition. Its integrated 25-Ω series output resistors actively dampen resonance with such loads, making it suitable for driving FR-4 traces, connectors, and multiple gate inputs without external termination.

Is SN74ABT2240APWRE4 compatible with 3.3-V logic inputs?

No, SN74ABT2240APWRE4 is not 3.3-V input-tolerant. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) are TTL-compatible but require V_CC-referenced logic levels. Direct connection to 3.3-V CMOS outputs risks marginal VIH margin and potential misreads; a level-shifting buffer or resistor divider is required for safe interfacing with 3.3-V controllers.

What is the thermal resistance (θ_JA) of SN74ABT2240APWRE4 in its TSSOP-20 package?

The junction-to-ambient thermal resistance (θ_JA) for SN74ABT2240APWRE4 in the PW (TSSOP-20) package is 128°C/W, as specified in the Absolute Maximum Ratings table. This value assumes JEDEC-standard PCB mounting with 1 in² copper pad; actual performance improves with enhanced thermal vias or larger copper areas. For continuous 12 mA per output operation, junction temperature rise remains within limits up to ~75°C ambient under typical board conditions.