Texas Instruments SN74LVT245BPW

Overview

SN74LVT245BPW 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 features direction control (DIR), output enable (OE), Ioff support for hot insertion, 2.7-V to 3.6-V VCC operation, and typical propagation delay of 2.3 ns at 3.3 V - used in mixed-voltage backplane interfaces and FPGA-to-ASIC interconnects.

For engineers reviewing the SN74LVT245BPW datasheet, SN74LVT245BPW pinout, SN74LVT245BPW application, or SN74LVT245BPW equivalent, key selection considerations include its TSSOP-20 package, ±100 µA Ioff at VCC = 0 V, 64 mA IOL drive strength, and compatibility with TTL-level inputs while operating on 3.3-V supply.

Technical Context

The SN74LVT245BPW 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 selects data flow direction (A→B or B→A), while OE independently places all outputs in high-impedance state - critical for bus arbitration and power sequencing.

It integrates Ioff circuitry that disables outputs when VCC = 0 V, preventing current backflow during hot insertion, and power-up 3-state logic ensures outputs remain high-Z during power ramp. Absolute maximum ratings include VI up to 7 V and VO up to 7 V in high-impedance or powered-off states.

Key Specifications

Pinout & Package

TSSOP-20 package (PW), 6.6 mm × 4.5 mm × 1.2 mm max height, 0.65 mm lead pitch, exposed pad not present. RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH245PW and 74ALVC16245PW, the SN74LVT245BPW uniquely delivers 5-V input tolerance, 64-mA drive, and certified hot-insertion support in a compact TSSOP-20 package - making it irreplaceable for robust mixed-voltage bus bridging where reliability and simplicity are prioritized.

Availability

SN74LVT245BPW is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA-to-ASIC bridges, and automotive infotainment gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVT245BPW 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 high-reliability logic and interface solutions.

The SN74LVT245BPW belongs to TI's ABT logic family, engineered specifically for high-speed, mixed-voltage bus interfacing in industrial, telecom, and computing infrastructure - emphasizing robustness, low noise, and seamless voltage domain translation.

FAQ

What is the maximum input voltage the SN74LVT245BPW can tolerate on its A/B ports?

The SN74LVT245BPW supports input voltages up to 7 V on A and B port pins regardless of VCC state, as confirmed by absolute maximum ratings. This allows direct connection to 5-V TTL buses while operating from a 3.3-V supply - no external clamping or level shifting is required for standard 5-V logic signals.

Does the SN74LVT245BPW support hot insertion, and what circuitry enables it?

Yes, the SN74LVT245BPW supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V (±100 µA leakage), and power-up 3-state forces all outputs into high-impedance during power ramp. These functions prevent current backflow and bus contention - validated per JESD78 Class II latch-up and JESD22 ESD standards.

What is the recommended pull-up configuration for OE on the SN74LVT245BPW?

TI specifies that OE should be tied to VCC through a pull-up resistor during power-up/down to guarantee high-impedance state. The minimum resistor value depends on the driver's current-sinking capability; for standard CMOS drivers, 10 kΩ is typical. This ensures outputs remain isolated until firmware explicitly asserts OE low.

Can the SN74LVT245BPW operate reliably at 2.7 V VCC, and how does performance change?

Yes, the SN74LVT245BPW is fully specified from 2.7 V to 3.6 V. At 2.7 V, VOL increases to 0.5 V (IOL = 24 mA), tPLH/tPHL extends to 4 ns max, and ICC drops to 0.19 mA (outputs disabled). All timing and DC parameters remain guaranteed - enabling battery-powered or brownout-resilient designs without functionality loss.

Is the SN74LVT245BPW pin-compatible with other packages in the SN74LVT245B family?

Yes, all SN74LVT245B variants - including DB (SSOP), DW (SOIC), NS (SOP), PW (TSSOP), and RGY (VQFN) - share identical pinout and function mapping per the datasheet top-view diagrams. The SN74LVT245BPW uses the same 20-pin assignment: DIR (1), A1–A8 (2–9), GND (10), VCC (11), OE (12), B1–B8 (13–20).