Texas Instruments SN74LVT245BPWG4

Overview

SN74LVT245BPWG4 from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 3.3-V and 5-V systems. It supports mixed-mode signal operation (5-V inputs/outputs with 3.3-V V_CC), delivers 64 mA sink current per output, features I_off and power-up 3-state for hot insertion, and operates across −40°C to +85°C in TSSOP-20 package.

For engineers reviewing the SN74LVT245BPWG4 datasheet, SN74LVT245BPWG4 pinout, SN74LVT245BPWG4 application, or SN74LVT245BPWG4 equivalent, key selection criteria include its 3.3-V supply compatibility with 5-V TTL interfacing, low ground bounce (<0.8 V typical V_OLP), hot-swap support via I_off, and guaranteed 3-state behavior during power-up/down.

Technical Context

The SN74LVT245BPWG4 implements an advanced BiCMOS ABT (Advanced Bus Transceiver) architecture enabling robust level-shifting between 3.3-V logic domains and legacy 5-V buses. Its DIR input controls data direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state - critical for bus arbitration and isolation.

Designed for hot-insertion environments, the device integrates I_off circuitry that disables outputs when V_CC = 0 V, preventing backflow current, and power-up 3-state logic that holds outputs high-Z until V_CC stabilizes. Latch-up performance exceeds 100 mA per JESD 78 Class II, and ESD protection meets 2000-V HBM, 200-V MM, and 1000-V CDM standards.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 1.2 mm max height, 0.65 mm lead pitch, exposed pad not present. Pin 1 index located at top-left corner with beveled edge marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVT245BPWG4, SN74LVC245AQPWRQ1 trades 5-V tolerance and hot-swap robustness for automotive qualification, while SN74ALVC164245VR expands bandwidth at the cost of layout area and hot-insertion safety - making SN74LVT245BPWG4 optimal for industrial backplanes requiring mixed-voltage resilience and live maintenance.

Availability

SN74LVT245BPWG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, server memory expansion modules, and automotive diagnostic gateways requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74LVT245BPWG4 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 decades of expertise in logic interface solutions.

The SN74LVT245BPWG4 belongs to TI's ABT logic family, engineered specifically for high-speed, mixed-voltage bus bridging in industrial automation, communications infrastructure, and computing systems demanding robust hot-swap operation.

FAQ

What is the maximum operating temperature range for the SN74LVT245BPWG4?

The SN74LVT245BPWG4 is rated for operation from −40°C to +85°C ambient temperature. This industrial temperature range ensures reliable performance in harsh environments such as factory automation controllers, telecom base stations, and automotive under-hood diagnostic modules where thermal stability is critical. The device's thermal characteristics, including θ_JA = 83°C/W, are specified within this range.

Does the SN74LVT245BPWG4 support true 5-V tolerant inputs?

Yes, the SN74LVT245BPWG4 supports 5-V tolerant inputs - it accepts VI up to 7 V per absolute maximum ratings and functions correctly with 5-V logic signals while powered from a 3.3-V V_CC. This eliminates external level-shifting components when interfacing with legacy 5-V systems, a core design feature confirmed in the "Supports Mixed-Mode Signal Operation" section of the datasheet.

How does the SN74LVT245BPWG4 handle power-up sequencing in multi-rail systems?

The SN74LVT245BPWG4 incorporates power-up 3-state logic that forces all outputs into high-impedance during V_CC ramp-up and ramp-down, preventing bus conflicts before system initialization completes. This behavior, combined with I_off protection, ensures safe operation even when OE is floating or V_CC rises slower than associated 5-V supplies - a requirement verified in hot-insertion testing per JESD standards.

Can the SN74LVT245BPWG4 drive standard TTL loads directly?

Yes, the SN74LVT245BPWG4 can drive standard TTL loads directly: its I_OL = 64 mA and I_OH = −32 mA meet or exceed the current requirements of legacy TTL devices (e.g., 74LS series). Combined with V_IH = 2.0 V and V_IL = 0.8 V input thresholds, this enables seamless integration without pull-up resistors or buffer stages in most 5-V bus environments.

Is the SN74LVT245BPWG4 RoHS compliant and lead-free?

Yes, the SN74LVT245BPWG4 is RoHS compliant and features a lead-free NIPDAU (nickel/palladium/gold) finish, as confirmed in TI's Package Option Addendum. It carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and is qualified for standard reflow profiles up to 260°C peak, supporting modern lead-free assembly processes without derating.