Texas Instruments SN74LV125ATNSR

Overview

SN74LV125ATNSR from Texas Instruments is a quadruple 3-state bus buffer gate IC used for bidirectional data isolation and bus driving in digital logic systems. It operates from 4.5 V to 5.5 V, delivers typical propagation delay of 3.8 ns at 5 V, supports TTL-voltage-compatible inputs, and features Ioff partial-power-down protection. It is commonly deployed in industrial control backplanes and mixed-voltage interface circuits.

For engineers reviewing the SN74LV125ATNSR datasheet, SN74LV125ATNSR pinout, SN74LV125ATNSR application, or SN74LV125ATNSR equivalent, key selection criteria include 3-state output timing (tpd ≤ 5.5 ns), Ioff leakage < 5 µA at 5.5 V, thermal resistance (RθJA = 76°C/W in NS package), and SOIC-14 compatibility with standard PCB footprints.

Technical Context

The SN74LV125ATNSR implements four independent non-inverting buffers, each with active-low 3-state output enable (OE). Its Ioff circuitry disables all outputs and limits input/output leakage to ≤5 µA when VCC = 0 V, enabling safe hot-insertion and partial power-down operation. Each channel supports mixed-mode voltage translation between 3.3-V and 5-V domains on inputs and outputs.

It uses CMOS silicon process with Schmitt-trigger–free inputs and is characterized across –40°C to +125°C. Output drive strength is ±16 mA at VCC = 4.5 V–5.5 V, with ground bounce (VOLP) < 0.8 V and VOH undershoot (VOHV) > 2.3 V at 5 V - critical for noise-immune bus signaling.

Key Specifications

Pinout & Package

SOP-14 (NS) package: 10.20 mm × 7.8 mm body, 1.27 mm lead pitch, gull-wing leads, 2.0 mm max height. RoHS-compliant, NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV125ATNSR, SN74LVC125APWR lacks 5-V operation and Ioff, while MC74LCX125DR2G omits Ioff and demands layout revision - making SN74LV125ATNSR the sole option supporting robust 5-V mixed-mode bus isolation with hot-swap safety.

Availability

SN74LV125ATNSR is available at Aetrix Electronics and suitable for industrial automation backplanes, microcontroller bus expansion, and legacy system interface applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74LV125ATNSR 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, with decades of experience in industrial-grade logic families.

The SN74LV125ATNSR belongs to TI's LV (Low-Voltage) logic series, designed specifically for robust 5-V digital interfacing with enhanced noise immunity, thermal performance, and power-down safety in harsh environments.

FAQ

What is the maximum operating temperature for the SN74LV125ATNSR?

The SN74LV125ATNSR is rated for continuous operation from –40°C to +125°C ambient temperature. This extended range is validated per JEDEC JESD22-A108 and applies to the NS (SOP-14) package variant. Thermal derating begins above 85°C ambient when power dissipation exceeds 350 mW, based on its RθJA of 76°C/W.

Does the SN74LV125ATNSR support partial power-down mode?

Yes, the SN74LV125ATNSR supports partial power-down via its Ioff feature. When VCC = 0 V, input and output leakage is limited to ≤5 µA across the full –40°C to +125°C range. This prevents damaging back-current flow into powered sections of the system, making SN74LV125ATNSR suitable for hot-plug and modular power architectures.

Can the SN74LV125ATNSR interface between 3.3-V and 5-V logic domains?

Yes, the SN74LV125ATNSR supports mixed-mode voltage operation: inputs tolerate 0–5.5 V regardless of VCC, and outputs swing rail-to-rail (0 to VCC). With VCC = 5 V, it accepts 3.3-V logic levels (VIH = 2 V min, VIL = 0.8 V max) and drives 5-V loads - enabling direct bridging without external level shifters.

What is the recommended decoupling for the SN74LV125ATNSR?

TI recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC (pin 14) and GND (pin 7) pins of the SN74LV125ATNSR. For systems with heavy bus switching, add a 4.7 µF tantalum or X7R ceramic bulk capacitor within 1 inch of the device. This maintains stable VCC during fast output transitions and suppresses ground bounce (VOLP < 0.8 V).

Is the SN74LV125ATNSR pin-compatible with other 74LV125 variants?

Yes, the SN74LV125ATNSR shares identical pinout and function with all SN74LV125x variants in SOIC-14 (D), SSOP-14 (DB), TSSOP-14 (PW), and VQFN-14 (RGY) packages. Pin numbering, signal names (1OE, 1A, 1Y, etc.), and electrical behavior are fully consistent - allowing drop-in replacement across TI's LV125 family when package footprint permits.