Texas Instruments SN74LVT245BPWR

Overview

SN74LVT245BPWR 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 buses. It features direction control (DIR), output enable (OE), I_off support for hot insertion, mixed-mode signal operation, and operates down to 2.7 V. It is used in voltage-level translation between legacy 5-V logic and modern low-voltage systems.

For engineers reviewing the SN74LVT245BPWR datasheet, SN74LVT245BPWR pinout, SN74LVT245BPWR application, or SN74LVT245BPWR equivalent, key selection considerations include its 20-pin TSSOP package, 3.3-V V_CC with 5-V tolerant inputs/outputs, 3.5 ns max propagation delay, ±100 µA I_off, and hot-insertion capability via power-up 3-state and I_off circuitry.

Technical Context

The SN74LVT245BPWR implements an advanced BiCMOS ABT (Advanced Bus Transceiver) architecture enabling TTL-compatible interfacing at 3.3-V supply while accepting 5-V inputs. Its DIR input selects data flow direction (A→B or B→A), and OE enables/disables all outputs into high-impedance state.

It integrates I_off protection to block current backflow during power-down and power-up 3-state logic to ensure outputs remain high-Z during supply ramping. 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 thermal pad optional per design requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH245APWRE4 and 74ALVC164245PAG, the SN74LVT245BPWR uniquely combines 5-V tolerance, I_off-enabled hot insertion, and single-pin direction control in a compact 20-pin TSSOP - making it optimal for retrofitting legacy 5-V subsystems into modern low-voltage controllers without layout or firmware changes.

Availability

SN74LVT245BPWR is available at Aetrix Electronics and suitable for industrial automation, embedded memory expansion, test equipment I/O modules, and automotive diagnostic adapters requiring stable component supply and long-term manufacturability.

Supply support for SN74LVT245BPWR 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 company specializing in analog, embedded processing, and logic solutions, with leadership in industrial, automotive, and communications markets.

The SN74LVT245BPWR belongs to TI's ABT logic family, engineered for high-speed, mixed-voltage bus interfacing in systems transitioning from 5-V to 3.3-V architectures while maintaining backward compatibility.

FAQ

What is the maximum operating voltage for SN74LVT245BPWR inputs?

The SN74LVT245BPWR supports input voltages up to 7 V, allowing direct connection to 5-V logic families without external level-shifting components. This 5-V tolerance applies to all A- and B-bus pins and control inputs (DIR, OE), enabling seamless integration into mixed-voltage systems while powered from a 3.3-V supply.

Does SN74LVT245BPWR support hot insertion, and how is it implemented?

Yes, SN74LVT245BPWR supports hot insertion via two integrated features: I_off circuitry disables outputs when V_CC = 0, preventing back-current flow, and power-up 3-state holds outputs in high-impedance during supply ramping. These functions eliminate bus contention and protect upstream/downstream devices during live board insertion in systems like modular test equipment.

What is the propagation delay of SN74LVT245BPWR at 3.3 V?

The SN74LVT245BPWR has a maximum propagation delay of 3.5 ns (t_PLH/t_PHL) at V_CC = 3.3 V and CL = 50 pF. Typical delay is 2.3 ns, enabling reliable operation in high-speed digital interfaces such as memory expansion buses and real-time industrial control backplanes operating above 100 MHz.

Can SN74LVT245BPWR operate below 3.3 V, and what is the minimum supply voltage?

Yes, SN74LVT245BPWR is fully specified down to 2.7 V V_CC, supporting unregulated battery-powered applications. At 2.7 V, it maintains guaranteed VOL ≤ 0.5 V (I_OL = 24 mA) and VOH ≥ 2.4 V (I_OH = −8 mA), ensuring interoperability with standard TTL and LVTTL logic thresholds across its entire industrial temperature range.

What package type is used for SN74LVT245BPWR, and what are its key mechanical dimensions?

SN74LVT245BPWR uses the TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body size, 1.2 mm maximum height, and 0.65 mm lead pitch. It features a standard gull-wing leadform with pin 1 index area marked on the top surface, and complies with JEDEC MO-153 for footprint compatibility and automated assembly.