Texas Instruments SN74LVTH125DRG4

Overview

SN74LVTH125DRG4 from Texas Instruments is a quad 3-state noninverting buffer designed for mixed-voltage system interfacing, supporting 5-V TTL inputs/outputs with 3.3-V V_CC, operating down to 2.7 V, delivering 64 mA low-level output drive, and featuring bus-hold circuitry to eliminate external pull resistors.

For engineers reviewing the SN74LVTH125DRG4 datasheet, SN74LVTH125DRG4 pinout, SN74LVTH125DRG4 application, or SN74LVTH125DRG4 equivalent, key selection factors include its hot-insertion support via I_off and power-up 3-state, ±100 µA off-state leakage, 4.2 ns typical propagation delay at 3.3 V, and SOIC-14 package compatibility with industrial temperature range (−40°C to 85°C).

Technical Context

The SN74LVTH125DRG4 implements four independent noninverting buffers, each with dedicated 3-state output-enable (OE) control. Its bus-hold circuitry actively maintains valid logic states on undriven data inputs without external components.

It supports true mixed-mode operation: 5-V-tolerant inputs and outputs while powered from a 3.3-V supply, and includes robust protection features-latch-up immunity exceeding 500 mA per JESD 17 and ESD ratings of 2000-V HBM and 200-V MM.

Key Specifications

Pinout & Package

SN74LVTH125DRG4 is housed in a 14-pin SOIC (D) package, 8.75 mm × 3.91 mm footprint, 1.75 mm max height, with standard 1.27 mm lead pitch and gull-wing leads. Pin 1 is marked by a beveled corner or index notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad noninverting buffer applications.

Compared with SN74LVC125DR and SN74AHCT125DR, the SN74LVTH125DRG4 uniquely combines 5-V-tolerant I/O, bus-hold, hot-insertion support, and sub-5 ns timing in a 3.3-V supply environment-making it irreplaceable for mixed-voltage industrial and test equipment designs requiring zero external bias components.

Availability

SN74LVTH125DRG4 is available at Aetrix Electronics and suitable for industrial automation, legacy system upgrades, and medical device manufacturing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74LVTH125DRG4 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 logic solutions for industrial, automotive, and communications markets.

The SN74LVTH125 family was engineered to solve mixed-voltage interoperability challenges in backplane and bus-interface applications where 3.3-V logic must reliably communicate with 5-V TTL peripherals.

FAQ

What is the maximum input voltage the SN74LVTH125DRG4 can tolerate on its data pins?

The SN74LVTH125DRG4 supports input voltages up to 5.5 V on all data (A) and output-enable (OE) pins, regardless of V_CC level. This 5-V tolerance enables direct connection to legacy TTL outputs without clamping diodes or level-shifting circuitry, a critical feature confirmed in the absolute maximum ratings table and functional description of the datasheet.

Does the SN74LVTH125DRG4 require external pullup or pulldown resistors on its inputs?

No, the SN74LVTH125DRG4 integrates active bus-hold circuitry on all data inputs (1A–4A), which maintains a valid logic state when inputs are floating or undriven. The datasheet explicitly states that use of external pullup/pulldown resistors with bus-hold is not recommended, as they may interfere with the internal hold current (±75 µA at V_CC = 3 V).

Can the SN74LVTH125DRG4 be used in hot-swap applications?

Yes, the SN74LVTH125DRG4 is fully specified for hot-insertion applications. Its I_off circuitry disables outputs and limits off-state current to ±100 µA when V_CC = 0 V, and its power-up 3-state feature ensures outputs remain high-impedance during power ramp-up or ramp-down-preventing bus conflicts and backdrive damage during live board insertion.

What is the typical propagation delay of the SN74LVTH125DRG4 at 3.3 V?

The SN74LVTH125DRG4 exhibits a typical propagation delay of 3.5 ns (t_PLH) and 3.9 ns (t_PHL) at V_CC = 3.3 V, CL = 50 pF, as specified in the switching characteristics table. This sub-5 ns performance enables reliable use in high-speed control buses and timing-critical data staging applications.

Which package type does the SN74LVTH125DRG4 use, and what are its key mechanical dimensions?

The SN74LVTH125DRG4 uses the SOIC (D) package: 14-pin, 8.75 mm × 3.91 mm body size, 1.75 mm maximum height, 1.27 mm lead pitch, and gull-wing leads. Its mechanical drawing (D0014A) confirms compliance with JEDEC MS-012 variation AB, and the part marking "LVTH125" appears on the top surface.