Texas Instruments SN74AHC245MDWREP

Overview

SN74AHC245MDWREP from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 8-bit buses. It operates across 2 V to 5.5 V V_CC, supports –55°C to 125°C extended temperature range, and features direction control (DIR) and output-enable (OE) inputs for flexible bus isolation in space-constrained industrial and defense systems.

For engineers reviewing the SN74AHC245MDWREP datasheet, SN74AHC245MDWREP pinout, SN74AHC245MDWREP application, or SN74AHC245MDWREP equivalent, key selection criteria include its SOIC-20 package, ±25 mA output drive, 5.5 ns typical propagation delay at 5 V, 3-state output isolation timing, and radiation-tolerant enhanced product (EP) qualification for harsh-environment deployment.

Technical Context

The SN74AHC245MDWREP implements dual-bus transceiver logic with independent DIR and OE controls: DIR selects data flow direction (A→B or B→A), while OE places all outputs in high-impedance state. Its CMOS AHC logic family ensures low power consumption and high noise immunity across the full operating voltage range.

It meets MIL-STD-833 Class B ESD requirements (>1000 V HBM), exceeds 250 mA latch-up immunity per JESD17, and uses TI's Controlled Baseline manufacturing with single-site assembly/test for traceable reliability in mission-critical applications.

Key Specifications

Pinout & Package

SN74AHC245MDWREP is housed in a 20-pin SOIC (DW) package with 0.300-inch body width, JEDEC MS-013 compliant footprint, and RoHS-compliant NiPdAu lead finish. The package supports standard reflow profiles (MSL Level-1, peak 260°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHC245MPWREP, SN74AHC245MDWREP offers lower thermal resistance and broader industry adoption; versus SN54AHC245, it provides faster procurement and reduced cost while retaining identical electrical performance and extended temperature capability - ideal for non-certified but high-reliability deployments.

Availability

SN74AHC245MDWREP is available at Aetrix Electronics and suitable for avionics data interfaces, satellite onboard computer links, and tactical radio baseband subsystems requiring stable component supply across extended temperature and long-life production cycles.

Supply support for SN74AHC245MDWREP 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 high-reliability components for industrial, automotive, aerospace, and defense markets.

The SN74AHC245MDWREP belongs to TI's Enhanced Product (EP) logic family, engineered for extended temperature operation, controlled baseline manufacturing, and long-term supply assurance in mission-critical systems.

FAQ

What is the maximum recommended operating voltage for SN74AHC245MDWREP?

The absolute maximum supply voltage for SN74AHC245MDWREP is 7 V, but the recommended operating range is strictly 2 V to 5.5 V per the datasheet. Operating above 5.5 V risks violating the recommended conditions and may compromise latch-up immunity or long-term reliability - always maintain V_CC within this window for guaranteed SN74AHC245MDWREP functionality and qualification compliance.

Does SN74AHC245MDWREP support hot-swap bus isolation?

Yes, SN74AHC245MDWREP supports controlled hot-swap isolation via its active-low OE input: asserting OE high places all A- and B-side outputs in high-impedance state within ≤9.2 ns at 5 V. To ensure safe insertion, tie OE to V_CC through a pullup resistor so the device powers up isolated - this prevents bus contention during live backplane connection, a key requirement for SN74AHC245MDWREP in modular avionics systems.

Is SN74AHC245MDWREP pin-compatible with standard SN74AHC245 variants?

SN74AHC245MDWREP shares identical pinout, logic function, and SOIC-DW package dimensions with commercial SN74AHC245 and automotive SN74AHC245-Q1 variants. However, it is not a drop-in replacement for non-EP versions in extended-temperature applications - only SN74AHC245MDWREP and SN74AHC245MPWREP carry the –55°C to 125°C qualification and Controlled Baseline manufacturing required for SN74AHC245MDWREP deployment in harsh environments.

What is the minimum pullup resistor value for OE on SN74AHC245MDWREP?

The minimum OE pullup resistor value for SN74AHC245MDWREP depends on the current-sinking capability of the driving source. Since OE is active-low and internally referenced to V_CC, TI recommends using a resistor that ensures VIH > 3.85 V at V_CC = 5.5 V. For typical 5 V systems with ≤100 µA leakage, a 10 kΩ resistor suffices; for robust noise immunity in noisy environments, 4.7 kΩ is preferred - always verify voltage margin at worst-case V_CC min and temperature for SN74AHC245MDWREP reliability.

How does SN74AHC245MDWREP handle input undervoltage or floating control pins?

SN74AHC245MDWREP requires all unused inputs - especially DIR and OE - to be held at valid logic levels (V_CC or GND) per TI application report SCBA004. Floating or slow-rising control pins risk undefined direction states or partial enablement, causing bus contention. TI specifies ∆t/∆v ≤ 20 ns/V at 5 V to prevent false triggering - use pullups/pulldowns and avoid unterminated traces to guarantee deterministic SN74AHC245MDWREP behavior in flight-critical systems.