Texas Instruments SN74LV8151DWR

Overview

SN74LV8151DWR 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 pin) for true/complementary Y1–Y8 outputs, Ioff support for partial-power-down mode, and Schmitt-trigger inputs enabling robust noise immunity on slow-rising/falling signals - used in industrial bus interface conditioning and mixed-voltage signal routing.

For engineers reviewing the SN74LV8151DWR datasheet, SN74LV8151DWR pinout, SN74LV8151DWR application, or SN74LV8151DWR equivalent, key selection criteria include its 15 ns max propagation delay at 5 V, ±35 mA output drive, hysteresis of 0.33 V (typ) at 3.3 V, Ioff leakage ≤5 µA, and SOIC-24 package compatibility with legacy board layouts.

Technical Context

This device integrates two dedicated Schmitt-trigger paths (A→P noninverting, B→N inverting) plus eight configurable D→Y buffers whose logic polarity is selected globally via the T/C input. All inputs and outputs support mixed-mode voltage operation across the full 2-V to 5.5-V VCC range, enabling level translation between 2.5-V, 3.3-V, and 5-V domains without external components.

The 3-state OE control enables bus sharing with precise enable/disable timing (ten ≤10.5 ns, tdis ≤10 ns at 5 V), while Ioff circuitry actively disables outputs during power-down to prevent backflow current - critical for hot-swap and partial-power-down systems where VCC sequencing is uncontrolled.

Key Specifications

Pinout & Package

SN74LV8151DWR uses a 24-pin SOIC (DW) package measuring 15.4 mm × 7.5 mm × 2.35 mm (max height), with 1.27-mm lead pitch and RoHS-compliant NiPdAu finish. Pin 1 index is located at top-left corner with notch orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV8151DWR, SN74LVC8T245PW lacks Schmitt inputs and Ioff, limiting use in noisy or partial-power-down environments; SN74LVTH162244DGGR offers more channels and drive but requires external circuitry for polarity inversion and noise rejection - making SN74LV8151DWR optimal for integrated signal integrity in industrial I/O.

Availability

SN74LV8151DWR is available at Aetrix Electronics and suitable for industrial bus interface, motor control signal conditioning, programmable logic I/O expansion, and legacy system voltage translation requiring stable component supply and long-term production continuity.

Supply support for SN74LV8151DWR 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 SN74LV8151DWR belongs to TI's LV family of low-voltage logic devices designed specifically for robust signal integrity in mixed-voltage industrial systems with demanding EMI, temperature, and power-sequencing requirements.

FAQ

What is the maximum propagation delay of SN74LV8151DWR at 3.3 V?

The maximum propagation delay of SN74LV8151DWR is 29 ns at VCC = 3.3 V with a 15-pF load, as specified in the switching characteristics table. This value applies to D→Y, T/C→Y, and A/B→P/N paths under recommended operating conditions and ensures timing compliance in 33-MHz industrial data links. SN74LV8151DWR maintains consistent performance across temperature (−40°C to +85°C) and load variations.

Does SN74LV8151DWR support partial-power-down operation?

Yes, SN74LV8151DWR supports partial-power-down operation via its Ioff circuitry, which disables outputs and limits leakage to ≤5 µA when VCC = 0 V. This prevents current backflow from powered system sections into the unpowered SN74LV8151DWR - a critical feature for hot-pluggable modules and FPGA-based systems with staggered power sequencing. The Ioff specification is verified per JESD78 Class II.

How does the T/C pin affect output logic polarity in SN74LV8151DWR?

When the T/C pin is high, SN74LV8151DWR configures Y1–Y8 as noninverting (true logic) outputs; when T/C is low, they become inverting (complementary logic). This global polarity control eliminates the need for discrete inverters in applications like bidirectional bus direction control or protocol format conversion. The T/C input itself has Schmitt-trigger action, ensuring clean transitions even with slow-rising control signals.

What is the hysteresis voltage (ΔVT) of SN74LV8151DWR at 2.5 V supply?

At VCC = 2.5 V, SN74LV8151DWR exhibits a typical hysteresis voltage (ΔVT = VT+ − VT−) of 0.25 V, with VT+ = 1.75 V and VT− = 0.75 V. This 10% supply hysteresis provides noise margins sufficient to reject common-mode transients on industrial sensor lines and long PCB traces. The hysteresis is inherent to all inputs (A, B, D1–D8, T/C, OE) and does not require external components.

Can SN74LV8151DWR be used for level translation between 5-V and 3.3-V systems?

Yes, SN74LV8151DWR supports mixed-mode voltage operation: it accepts input voltages up to 5.5 V regardless of VCC setting and drives outputs from 0 V to VCC. When powered at 3.3 V, it safely interfaces with 5-V inputs (e.g., legacy microcontrollers) and delivers 3.3-V-compatible outputs to modern FPGAs - all without external resistors or translators. This capability is explicitly validated in TI's recommended operating conditions.