Texas Instruments SN74LVT125PWRG4

Overview

SN74LVT125PWRG4 from Texas Instruments is a quad 3-state noninverting buffer with bus-hold inputs and I_off support, designed for 3.3-V V_CC operation while interfacing to 5-V TTL systems. It features 14-pin TSSOP packaging, ±100 µA I_off current at V_CC = 0 V, and t_PLH/t_PHL ≤ 4.5 ns at V_CC = 3.3 V - enabling reliable level translation in mixed-voltage digital backplanes.

For engineers reviewing the SN74LVT125PWRG4 datasheet, SN74LVT125PWRG4 pinout, SN74LVT125PWRG4 application, or SN74LVT125PWRG4 equivalent, key selection criteria include its 2.7–3.6-V supply range, bus-hold input retention (eliminating external pullups), I_off-enabled partial-power-down capability, and guaranteed 64-mA sink current per output under industrial temperature conditions.

Technical Context

This device implements four independent noninverting buffers, each with an active-low output-enable control (OE) that places the corresponding Y output in high-impedance state when asserted high. The bus-hold circuitry actively maintains undriven inputs at valid logic levels without external resistors, reducing BOM count and layout complexity in sparse-bus environments.

Its I_off protection disables outputs during power-down, preventing backflow current when V_CC = 0 V and input/output voltages range from 0 to 4.5 V. Absolute maximum ratings permit VI up to 7 V and VO up to 7 V, supporting robust interfacing between 3.3-V logic domains and legacy 5-V signal sources.

Key Specifications

Pinout & Package

TSSOP-14 package (PW), 5.0 mm × 4.4 mm × 1.2 mm height, with exposed pad for thermal enhancement and JEDEC MO-153 compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 3-state buffer applications.

Compared with SN74LVTH125PWRE4 and SN74ALVC125PW, the SN74LVT125PWRG4 uniquely combines bus-hold, I_off, and 64-mA drive - making it the only option among the three qualified for unattended industrial backplane interfaces requiring zero external components and fail-safe power sequencing.

Availability

SN74LVT125PWRG4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and communications infrastructure requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.

Supply support for SN74LVT125PWRG4 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 experience in industrial-grade logic solutions.

The SN74LVT125PWRG4 belongs to TI's LVT (Low-Voltage BiCMOS Technology) logic family, engineered for high-speed, mixed-voltage interfacing in mission-critical industrial and telecom systems where reliability and signal integrity are non-negotiable.

FAQ

What is the maximum input voltage tolerance for SN74LVT125PWRG4?

The SN74LVT125PWRG4 supports input voltages up to 7 V, as specified in its absolute maximum ratings. This allows direct connection to 5-V TTL signal sources without external clamping or level-shifting circuitry, while operating from a 3.3-V supply - a key enabler for mixed-voltage system integration. The device maintains this rating across its full −40°C to 85°C operating temperature range.

Does SN74LVT125PWRG4 require external pullup resistors on its inputs?

No, SN74LVT125PWRG4 does not require external pullup resistors because it integrates active bus-hold circuitry on all four data inputs (A1–A4). This feature maintains undriven or floating inputs at their last valid logic state, eliminating the need for 4.7-kΩ external resistors and reducing BOM cost and PCB real estate - confirmed in the functional description and electrical characteristics table of the official datasheet.

Can SN74LVT125PWRG4 be used in hot-swap applications?

Yes, SN74LVT125PWRG4 is explicitly designed for hot-swap use via its I_off circuitry, which limits current to ±100 µA when V_CC = 0 V and inputs/outputs are biased between 0 V and 4.5 V. This prevents damaging backflow current during insertion or removal of powered modules - a requirement validated by JEDEC JESD-78 testing and documented in the "Partial-Power-Down Mode Operation" section of the datasheet.

What is the thermal performance of SN74LVT125PWRG4 in its TSSOP package?

The SN74LVT125PWRG4 in TSSOP-14 (PW) package has a junction-to-ambient thermal resistance (θ_JA) of 113°C/W, as measured per JESD 51-7. This value assumes standard JEDEC 2S2P test board conditions; actual performance improves with PCB copper pour under the exposed pad. At 64-mA output load and 3.3-V supply, typical power dissipation remains below 120 mW, keeping junction temperature well within safe limits even in enclosed industrial enclosures.

How does the bus-hold function behave during power-up or power-down of SN74LVT125PWRG4?

During power-up or power-down, the bus-hold circuitry in SN74LVT125PWRG4 remains functional across the entire V_CC range from 0.5 V to 3.6 V, actively retaining the last valid logic state on each input. This behavior is guaranteed by design and eliminates metastability or undefined states on address/data buses during supply ramping - a critical feature verified in TI application report SCBA004 and reflected in the device's recommended operating conditions.