Texas Instruments SN74LV8151DW

Overview

SN74LV8151DW from Texas Instruments is a 10-bit universal Schmitt-trigger buffer with 3-state outputs, operating from 2 V to 5.5 V. It features polarity control (T/C) for true/complementary Y1–Y8 outputs, Ioff support for partial-power-down mode, and 15 ns max propagation delay at 5 V. It is used in mixed-voltage interface buffering and noise-immune signal conditioning in industrial control backplanes.

For engineers reviewing the SN74LV8151DW datasheet, SN74LV8151DW pinout, SN74LV8151DW application, or SN74LV8151DW equivalent, key selection criteria include Schmitt-trigger hysteresis (0.33 V typ at 3.3 V), 3-state enable timing (ten = 6 ns min at 5 V), Ioff leakage (<5 µA), and SOIC-24 package compatibility with legacy 24-pin logic layouts.

Technical Context

The SN74LV8151DW integrates two dedicated Schmitt-trigger paths (A→P noninverting, B→N inverting) plus eight configurable D→Y channels whose logic polarity is selected by the T/C input. All inputs accept slow-rising/falling signals due to ≥0.33 V hysteresis at 3.3 V supply.

Its 3-state output control uses active-low OE, with guaranteed high-impedance entry (tdis ≤10 ns) and exit (ten ≤10.5 ns) at 5 V. The Ioff circuit actively disables outputs during power-down, blocking reverse current flow when VCC = 0 while inputs/outputs remain biased between −0.5 V and 7 V.

Key Specifications

Pinout & Package

SN74LV8151DW is housed in a 24-pin SOIC (DW) package, 7.5 mm × 15.4 mm body, 1.27 mm pitch, JEDEC MS-013 compliant, with gull-wing leads and exposed metal-free die pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit Schmitt-trigger buffer applications.

Compared with SN74LV8151DW, SN74LVC8151PW offers faster speed but sacrifices 5 V compatibility and Ioff protection, while 74LVTH162244DGGR delivers more outputs and drive strength but adds design overhead for noise filtering and logic inversion - making SN74LV8151DW optimal for mixed-voltage, noise-prone industrial interfaces requiring configurability and power sequencing robustness.

Availability

SN74LV8151DW is available at Aetrix Electronics and suitable for industrial automation, programmable logic controller (PLC) I/O expansion, and legacy bus signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for SN74LV8151DW 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 SN74LV8151DW belongs to TI's LV family of low-voltage logic devices, engineered for robust mixed-signal interfacing in harsh electromagnetic environments with emphasis on noise immunity, power sequencing resilience, and wide supply tolerance.

FAQ

What is the maximum propagation delay of the SN74LV8151DW at 3.3 V operation?

The SN74LV8151DW has a maximum propagation delay (tpd) of 29 ns at VCC = 3.3 V, CL = 15 pF, and TA = 25°C. This value applies to the D-to-Y path and ensures deterministic timing for 3.3 V digital control buses. The SN74LV8151DW maintains consistent performance across its full operating temperature range (−40°C to +85°C), with worst-case tpd remaining within datasheet limits under industrial thermal conditions.

Does the SN74LV8151DW support partial-power-down mode, and how is it implemented?

Yes, the SN74LV8151DW supports partial-power-down mode via its Ioff circuitry. When VCC = 0 V, the Ioff feature disables all outputs and limits input/output leakage to <5 µA, preventing damaging current backflow from live system rails. This behavior is verified per JESD 78 and is critical for hot-swap applications. The SN74LV8151DW achieves this without external components, making it suitable for modular PLC backplanes and field-replaceable compute cards.

How does the T/C pin affect the Y1–Y8 outputs of the SN74LV8151DW?

The T/C pin on the SN74LV8151DW selects the logic polarity of outputs Y1 through Y8: when T/C is high, Yn follows Dn (true logic); when T/C is low, Yn is the inverse of Dn (complementary logic). This configuration is static and does not require clocking. The SN74LV8151DW implements this using internal gating, so no additional delay is added beyond standard propagation time - enabling real-time reconfiguration of I/O polarity in programmable logic subsystems.

What package type and dimensions does the SN74LV8151DW use?

The SN74LV8151DW uses a 24-pin SOIC (DW) package per JEDEC MS-013, with body dimensions of 7.5 mm × 15.4 mm, 1.27 mm lead pitch, and 2.35 mm maximum height. Its gull-wing lead form supports standard reflow profiles (MSL Level-1), and the package is RoHS-compliant with NiPdAu lead finish. The SN74LV8151DW footprint is compatible with legacy 24-pin logic layouts, easing migration from older 74-series devices.

Can the SN74LV8151DW interface between 5 V and 3.3 V logic domains without external level shifters?

Yes, the SN74LV8151DW supports mixed-mode voltage operation: its inputs tolerate VI up to 7 V and outputs drive VO up to VCC + 0.5 V, allowing direct connection of 5 V signals to the inputs while operating at 3.3 V VCC. The SN74LV8151DW maintains valid logic thresholds (VIH = 2.31 V, VIL = 0.99 V at 3.3 V) and full output swing (VOH ≥ 2.48 V, VOL ≤ 0.44 V), eliminating need for discrete level translators in bidirectional control line buffering.