Texas Instruments SN74LV125ANSR

Overview

SN74LV125ANSR from Texas Instruments is a quadruple 3-state bus buffer gate designed for level-translating, bidirectional bus isolation in mixed-voltage systems. It operates from 2 V to 5.5 V, delivers ≤5.5 ns propagation delay at 5 V, supports 5.5-V-tolerant inputs, and features I_off for partial-power-down protection. It is used in enterprise SSDs and PoE controllers where voltage translation and bus contention prevention are critical.

For engineers reviewing the SN74LV125ANSR datasheet, SN74LV125ANSR pinout, SN74LV125ANSR application, or SN74LV125ANSR equivalent, this page provides verified functional identity, confirmed NS package mapping, validated 14-pin SOP pin functions, real-world timing and noise performance data, and two technically documented alternative parts with explicit functional and application distinctions.

Technical Context

The SN74LV125ANSR implements four independent noninverting buffers, each with an active-low 3-state output enable (OE) controlling high-impedance output state. Its CMOS design enables mixed-mode operation: inputs tolerate up to 5.5 V regardless of V_CC, allowing down-translation from 5-V logic to 3.3-V or 2.5-V buses.

It integrates I_off circuitry that disables all outputs and isolates I/Os during power-down, preventing back-drive current. Ground bounce (V_OLP) and undershoot (V_OHV) are characterized at <0.8 V and >2.3 V respectively under 3.3-V operation - key for signal integrity in high-speed digital interfaces.

Key Specifications

Pinout & Package

SN74LV125ANSR is supplied in a 14-pin SOP (Small Outline Package) with body size 10.20 mm × 5.30 mm, lead pitch 1.27 mm, and gull-wing leads. The package is RoHS-compliant, moisture sensitivity level (MSL) 1, and rated for reflow up to 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV125ANSR, SN74LVC125APW offers better speed in low-voltage systems but sacrifices 5-V compatibility, while 74LVX125M matches footprint and cost but lacks the critical 5.5-V input tolerance needed for mixed-voltage industrial designs.

Availability

SN74LV125ANSR is available at Aetrix Electronics and suitable for enterprise SSDs, Power over Ethernet (PoE) controllers, and programmable logic controllers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SN74LV125ANSR 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 and embedded processing technologies, with decades of experience in industrial, automotive, and communications IC design.

The SN74LV125A family was developed to address voltage translation and bus isolation challenges in mixed-supply digital systems - particularly targeting industrial control, storage, and power infrastructure applications where reliability and interoperability across voltage domains are critical.

FAQ

What is the exact package type and dimensions of SN74LV125ANSR?

SN74LV125ANSR is packaged in a 14-pin SOP (Small Outline Package) with nominal body dimensions of 10.20 mm × 5.30 mm and 1.27-mm lead pitch. This NS package variant is distinct from D (SOIC), DB (SSOP), or DGV (TVSOP) versions - mechanical drawings confirm its standardized JEDEC MS-012 outline and thermal pad absence.

Does SN74LV125ANSR support true 5-V-to-3.3-V level translation?

Yes, SN74LV125ANSR supports true down-translation: its inputs tolerate up to 5.5 V regardless of V_CC voltage, so it can accept 5-V logic signals while powered from 3.3 V or 2.5 V. This eliminates external level shifters in mixed-voltage SSD and PLC designs - a core function confirmed in TI's Feature Description and Recommended Operating Conditions tables.

What is the maximum output drive capability of SN74LV125ANSR?

SN74LV125ANSR delivers ±16 mA per output at V_CC = 4.5–5.5 V, with absolute maximum continuous output current rated at ±35 mA per pin and ±70 mA total device current. These values are specified in Section 6.1 Absolute Maximum Ratings and Electrical Characteristics tables - critical for driving terminated traces or multiple CMOS inputs without exceeding safe limits.

Is SN74LV125ANSR suitable for hot-swap applications?

Yes, SN74LV125ANSR supports hot-swap via its I_off feature: when V_CC = 0 V, leakage current remains ≤5 µA, preventing back-drive current from live buses into unpowered sections. This behavior is explicitly tested and guaranteed per JESD78, making SN74LV125ANSR appropriate for modular PLC backplanes and hot-pluggable SSD carriers.

How does SN74LV125ANSR mitigate ground bounce and output undershoot?

SN74LV125ANSR is characterized for low dynamic noise: typical V_OLP (ground bounce) is <0.8 V and V_OHV (output undershoot) is >2.3 V at V_CC = 3.3 V and T_A = 25°C. These values - measured per JEDEC standards and published in the Features section - result from controlled output drive strength and internal slew-rate limiting, directly improving signal integrity in multi-buffered bus systems.