Texas Instruments SN74LV8151NT

Overview

SN74LV8151NT from Texas Instruments is a 10-bit universal Schmitt-trigger buffer with 3-state outputs, operating from 2 V to 5.5 V VCC. It features polarity control (T/C) 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 translation.

For engineers reviewing the SN74LV8151NT datasheet, SN74LV8151NT pinout, SN74LV8151NT application, or SN74LV8151NT equivalent, key selection criteria include its 15 ns max tpd at 5 V, ±35 mA output drive, 24-pin PDIP package, Ioff-enabled power sequencing, and dual-path A→P (buffer) / B→N (inverter) functionality.

Technical Context

This device integrates two independent Schmitt-trigger signal paths: A→P (noninverting buffer) and B→N (inverting buffer), plus eight configurable D→Y channels whose logic polarity is selected by the T/C input. All inputs accept 2-V to 5.5-V logic levels, supporting mixed-mode voltage operation across ports.

The 3-state outputs are controlled by OE, with guaranteed high-impedance behavior during power-up/down when OE is pulled up to VCC. Ioff circuitry actively disables outputs during power-down, preventing backflow current - critical for hot-swap and partial-power-down systems.

Key Specifications

Pinout & Package

SN74LV8151NT uses a 24-pin plastic dual in-line package (PDIP-NT) with 0.3-inch body width and through-hole mounting. Thermal resistance θJA is 67°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV8151NT, SN74LVTH162244DGGR offers greater channel density and speed but forfeits Schmitt noise rejection and Ioff safety; SN74LVC14APW provides compact Schmitt inversion but lacks configurability, 3-state control, and scalability for 10-signal buses.

Availability

SN74LV8151NT is available at Aetrix Electronics and suitable for industrial automation, factory instrumentation, and legacy system upgrades requiring stable component supply, long-lifecycle support, and through-hole manufacturability.

Supply support for SN74LV8151NT 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 heritage in industrial-grade interface ICs.

The SN74LV8151NT belongs to TI's LV logic family, designed specifically for robust signal conditioning in mixed-voltage industrial systems where noise immunity, power sequencing, and long-term availability are critical.

FAQ

What is the maximum operating frequency supported by SN74LV8151NT?

The SN74LV8151NT does not specify a maximum clock frequency because it is a combinational buffer, not a clocked device. Its usable signal rate is determined by propagation delay (15 ns max at 5 V) and load capacitance. For a 50 pF load, the practical limit is ~20 MHz for clean edge transitions - verified by tpd and tdis measurements in the SCES610 datasheet under 3.3 V and 5 V conditions.

Does SN74LV8151NT support 1.8 V logic inputs?

No, SN74LV8151NT does not reliably recognize 1.8 V as a valid high-level input. Its VIH minimum is VCC × 0.7 - so at VCC = 2 V, VIH(min) = 1.4 V, but the device is only characterized down to 2 V VCC operation. Inputs below 2 V violate recommended operating conditions and may cause undefined output states or increased ICC; 1.8 V interfaces require a level shifter or compatible 1.8-V–tolerant buffer like SN74LVC1G17.

How should OE be connected to ensure glitch-free power-up on SN74LV8151NT?

To prevent bus contention during power-up, OE on SN74LV8151NT must be held high (disabled state) until VCC stabilizes. TI recommends tying OE to VCC through a pullup resistor; the minimum value depends on the driver's sink capability - typically 4.7 kΩ suffices for most microcontrollers. This ensures all Y outputs remain in high-impedance until firmware explicitly asserts OE low.

Can SN74LV8151NT drive a 100 pF capacitive load while maintaining timing specs?

SN74LV8151NT is characterized up to 50 pF in the datasheet (SCES610, p.5–6). At 100 pF, propagation delay increases beyond the 15 ns max spec - measured tpd rises to ~35 ns at 5 V with 100 pF load. For designs requiring strict <20 ns timing, reduce load capacitance using series termination or split routing; otherwise, validate timing margins empirically with worst-case VCC/temperature.

Is there a surface-mount replacement for SN74LV8151NT with identical functionality?

Yes - SN74LV8151PWR (TSSOP-24) and SN74LV8151DGVR (TVSOP-24) share identical logic, timing, and electrical specifications with SN74LV8151NT. Both are active, RoHS-compliant, and pin-compatible. The PDIP-NT version remains preferred for prototyping and through-hole production, while PWR/DGVR suit high-density SMT assembly.