Texas Instruments SN74LV245ARKSR

Overview

SN74LV245ARKSR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between voltage domains. It operates from 2 V to 5.5 V, delivers ≤6.5 ns propagation delay at 5 V, supports mixed-mode I/O (e.g., 5-V inputs into 3.3-V system), and features Ioff for partial-power-down isolation-used in server backplanes and LED display controllers.

For engineers reviewing the SN74LV245ARKSR datasheet, SN74LV245ARKSR pinout, SN74LV245ARKSR application, or SN74LV245ARKSR equivalent, key selection criteria include its 20-pin RKS VQFN package (4.5 mm × 2.5 mm), 35 mA per-output drive capability, ±1 µA input leakage, 3.3 V/5 V switching performance, and compatibility with industrial temperature range (–40°C to 125°C).

Technical Context

The SN74LV245ARKSR implements a dual-bus directional control architecture using DIR and OE inputs: DIR selects data flow direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state. Its Ioff circuitry actively blocks current flow when VCC = 0 V, enabling safe hot-insertion and power sequencing in multi-rail systems.

It provides overvoltage-tolerant inputs (up to 5.5 V regardless of VCC), low ground bounce (<0.8 V at 3.3 V), and controlled edge rates to suppress output ringing-critical for noise-sensitive LED driver and telecom switch interfaces operating under mixed-voltage conditions.

Key Specifications

Pinout & Package

The SN74LV245ARKSR is housed in a 20-pin RKS VQFN package measuring 4.50 mm × 2.50 mm with an exposed thermal pad, optimized for space-constrained PCB layouts and enhanced thermal dissipation (RθJA = 67.7°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245A and 74ALVC245, the SN74LV245ARKSR uniquely combines 5.5 V input tolerance, Ioff-enabled power sequencing, and full industrial temperature range - making it the only option qualified for telecom infrastructure and high-reliability server backplane use cases.

Availability

SN74LV245ARKSR is available at Aetrix Electronics and suitable for server backplanes, LED display controllers, and telecom switch fabrics requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production ramp.

Supply support for SN74LV245ARKSR 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 connectivity technologies with over 50 years of innovation in industrial, automotive, and communications markets.

The SN74LV245ARKSR belongs to TI's LV logic family, engineered for low-voltage, high-noise-immunity bus interfacing in mixed-signal systems where voltage domain bridging and power-aware design are essential.

FAQ

What is the maximum operating voltage for SN74LV245ARKSR?

The SN74LV245ARKSR supports a supply voltage range of 2 V to 5.5 V. Its inputs tolerate up to 5.5 V regardless of VCC level, enabling robust down-translation (e.g., 5 V signals into a 3.3 V system). This specification is validated across the full industrial temperature range (–40°C to 125°C) and documented in Section 6.1 (Absolute Maximum Ratings) and 6.3 (Recommended Operating Conditions) of the official datasheet.

Does SN74LV245ARKSR support hot-swap or partial-power-down operation?

Yes, SN74LV245ARKSR includes Ioff circuitry that disables outputs and limits leakage to ≤5 µA when VCC = 0 V. This feature prevents damaging current backflow during power sequencing or hot-insertion events, satisfying JESD78 latch-up immunity requirements. The functionality is explicitly verified in Section 8.3 (Feature Description) and Table 6.5 (Electrical Characteristics) of the datasheet.

What package type and dimensions does SN74LV245ARKSR use?

SN74LV245ARKSR uses the RKS VQFN package: 20-pin, 4.50 mm × 2.50 mm body size with an exposed thermal pad. It has a tape-and-reel quantity of 3000 units per reel, 12.4 mm reel width, and MSL Level-1 rating (260°C peak reflow, unlimited floor life). Full mechanical drawings and packaging details appear in the Package Option Addendum (page 13) of the SCLS382R datasheet.

How does the DIR and OE pin interaction define functional modes in SN74LV245ARKSR?

In SN74LV245ARKSR, OE (active-low) controls output enable/disable: when high, all A/B ports enter high-impedance isolation. When OE is low, DIR determines direction - high enables A→B data flow, low enables B→A. This two-signal control scheme is defined in Table 8-1 (Function Table) and enables deterministic bus arbitration without external logic. The behavior is electrically verified across all VCC and temperature conditions.

Is SN74LV245ARKSR compatible with 3.3 V and 5 V logic families simultaneously?

Yes, SN74LV245ARKSR supports true mixed-mode operation: its inputs accept voltages up to 5.5 V independent of VCC, allowing 5 V signals to safely interface with a 3.3 V-powered device. Outputs swing rail-to-rail (VOL ≤ 0.55 V, VOH ≥ 3.8 V at 4.5 V VCC), meeting TTL and CMOS thresholds. This capability is confirmed in Sections 6.5 (Electrical Characteristics) and 8.3 (Feature Description) of the datasheet.