Texas Instruments SN74LVTH245ADBRG4

Overview

SN74LVTH245ADBRG4 from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous 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 at V_CC = 3.3 V, and features bus-hold circuitry eliminating external pullup/pulldown resistors - used in industrial backplane interfaces and legacy-to-modern voltage-level bridging.

For engineers reviewing the SN74LVTH245ADBRG4 datasheet, SN74LVTH245ADBRG4 pinout, SN74LVTH245ADBRG4 application, or SN74LVTH245ADBRG4 equivalent, key selection criteria include its 20-pin SSOP (DB) package, I_off support for hot insertion, ±100 µA off-state leakage, 3.7 ns typical propagation delay (t_PLH/t_PHL), and compliance with JESD 17 latch-up (>500 mA) and JESD 22 ESD standards (2000-V HBM).

Technical Context

This device implements an ABT (Advanced BiCMOS Technology) logic architecture enabling TTL-compatible interfacing while operating from a 3.3-V supply. Its direction-control (DIR) input determines data flow direction (A→B or B→A), and output-enable (OE) provides high-impedance isolation. The bus-hold circuitry actively maintains valid logic levels on floating A/B port inputs without external components.

Designed for hot-insertion environments, SN74LVTH245ADBRG4 integrates I_off protection to block reverse current during power-down and power-up 3-state logic to prevent bus contention. Absolute maximum ratings allow V_I up to 7 V and V_CC down to 2.7 V, supporting unregulated battery operation.

Key Specifications

Pinout & Package

SN74LVTH245ADBRG4 is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, 7.4 mm × 5.3 mm body, and 2.0 mm max height. Pin 1 index is marked by a corner chamfer and located at top-left when viewed top-side with notch or dot orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245A and SN74ALVC245, SN74LVTH245ADBRG4 uniquely combines 5-V-tolerant I/O, integrated bus-hold, and I_off-enabled hot insertion - making it the only option among the three qualified for mixed-voltage backplane bridging with zero external passive components.

Availability

SN74LVTH245ADBRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, automotive body control modules, and test equipment signal conditioning requiring stable component supply across extended temperature and voltage ranges.

Supply support for SN74LVTH245ADBRG4 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

SN74LVTH245ADBRG4 belongs to TI's ABT logic family, engineered specifically for robust mixed-voltage system interfacing with emphasis on hot-swap reliability, bus integrity, and legacy compatibility.

FAQ

What is the recommended power supply decoupling for SN74LVTH245ADBRG4?

Place a 0.1 µF ceramic capacitor between V_CC (pin 20) and GND (pin 10) as close as possible to the device. For systems with high simultaneous switching noise, add a 4.7 µF tantalum or aluminum electrolytic capacitor near the power entry point. This ensures stable V_CC during fast output transitions and minimizes ground bounce observed in SN74LVTH245ADBRG4's specified <0.8 V VOLP.

Can SN74LVTH245ADBRG4 interface directly with 5-V CMOS logic?

Yes - SN74LVTH245ADBRG4 supports 5-V input and output voltages while operating from a 3.3-V V_CC. Its inputs tolerate up to 7 V, and outputs drive to VOH ≥ 2.0 V and VOL ≤ 0.55 V into 5-V TTL loads. No external level-shifting circuitry is required, making SN74LVTH245ADBRG4 ideal for bridging 3.3-V controllers to 5-V peripherals.

How does the bus-hold feature function on SN74LVTH245ADBRG4?

The bus-hold circuitry on SN74LVTH245ADBRG4 actively maintains the last-valid logic state on unused A or B port inputs using feedback transistors. It sources or sinks up to ±750 µA to hold the line, eliminating external pullup/pulldown resistors. This feature is always enabled and requires no configuration - a key differentiator of SN74LVTH245ADBRG4 versus standard LVC or ALVC transceivers.

Is SN74LVTH245ADBRG4 suitable for hot-plug applications?

Yes - SN74LVTH245ADBRG4 incorporates both I_off circuitry and power-up 3-state logic. When V_CC = 0 V, I_off limits current flow to ±100 µA, preventing damage from backfeeding. During power ramp-up, outputs remain in high-impedance until V_CC stabilizes, avoiding bus conflicts. These features make SN74LVTH245ADBRG4 compliant with industry hot-swap requirements.

What is the thermal performance of SN74LVTH245ADBRG4 in its SSOP package?

SN74LVTH245ADBRG4 in the DB (SSOP) package has a junction-to-ambient thermal resistance (θ_JA) of 70°C/W under standard JEDEC conditions. At maximum rated I_OL = 64 mA per output and worst-case V_OL = 0.55 V, total power dissipation remains below 100 mW - resulting in <7°C junction rise above ambient. No heatsink is required for typical industrial use cases.