Texas Instruments SN74LV8151PWRE4

Overview

SN74LV8151PWRE4 from Texas Instruments is a 10-bit universal Schmitt-trigger buffer with 3-state outputs, supporting 2-V to 5.5-V V_CC operation, 15-ns max propagation delay at 5 V, and polarity-selectable true/complementary Y outputs via T/C pin. It enables robust signal conditioning in mixed-voltage industrial I/O interfaces.

For engineers reviewing the SN74LV8151PWRE4 datasheet, SN74LV8151PWRE4 pinout, SN74LV8151PWRE4 application, or SN74LV8151PWRE4 equivalent, key selection criteria include Schmitt-trigger hysteresis (0.33 V typ at 3.3 V), I_off support for partial-power-down mode, and guaranteed 3-state enable/disable timing (t_en = 6 ns min, t_dis = 6 ns min at 5 V).

Technical Context

The SN74LV8151PWRE4 integrates two dedicated Schmitt-trigger paths - A→P (noninverting) and B→N (inverting) - plus eight configurable D→Y channels whose logic polarity (true or complementary) is selected globally by the T/C input. All inputs tolerate slow rise/fall times due to ≥0.33 V hysteresis at 3.3 V.

Its 3-state outputs are controlled by OE, with guaranteed low-impedance drive (I_OL = 12 mA, I_OH = −12 mA at 4.5–5.5 V) and fast enable/disable (t_en/t_dis ≤ 10.5 ns at 5 V). I_off limits backflow current to 5 µA when powered down, enabling safe bus sharing in partial-power-down systems.

Key Specifications

Pinout & Package

TSSOP-24 package (PW), 7.9 mm × 4.5 mm × 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV8151PWRE4, SN74LVC8T245PWRE4 offers voltage translation but no Schmitt noise rejection or polarity control, while SN74LVTH162244DGGR delivers higher drive and channel count but sacrifices hysteresis and configurability - making SN74LV8151PWRE4 uniquely suited for mixed-signal industrial I/O where noise immunity and logic flexibility are critical.

Availability

SN74LV8151PWRE4 is available at Aetrix Electronics and suitable for industrial sensor interfaces, PLC digital I/O modules, and automated test fixture control requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LV8151PWRE4 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LV8151PWRE4 belongs to TI's LV logic family, designed specifically for robust, low-voltage industrial I/O conditioning - emphasizing noise immunity, mixed-voltage interoperability, and safe partial-power-down operation.

FAQ

What is the function of the T/C pin on the SN74LV8151PWRE4?

The T/C (True/Complement) pin on the SN74LV8151PWRE4 globally configures the logic polarity of all eight Y outputs: when T/C is high, Y1–Y8 replicate D1–D8 (true logic); when low, they output inverted versions (complementary logic). This eliminates the need for external inverters in applications requiring selectable signal polarity, such as configurable sensor output mapping or test pattern generation. The SN74LV8151PWRE4 uses this single control to unify logic behavior across all eight channels.

Does the SN74LV8151PWRE4 support partial-power-down operation?

Yes, the SN74LV8151PWRE4 supports partial-power-down operation via its I_off circuitry, which disables outputs and limits backflow current to 5 µA maximum when V_CC = 0 V. This feature allows safe integration into live backplanes or hot-swap I/O modules where subsystems power up/down asynchronously. The SN74LV8151PWRE4 maintains isolation without external isolation components, meeting JESD78 latch-up and JEDEC JESD22 ESD requirements for rugged industrial use.

What is the minimum recommended pull-up resistor value for the OE pin on the SN74LV8151PWRE4?

The OE pin on the SN74LV8151PWRE4 must be tied to V_CC through a pull-up resistor to ensure high-impedance state during power-up or power-down. The minimum resistor value depends on the current-sinking capability of the driving source - TI specifies that the resistor must limit current to avoid exceeding the OE input's absolute maximum rating. For standard CMOS drivers, a 10-kΩ pull-up is typical; however, the SN74LV8151PWRE4 datasheet states the minimum value is determined by the driver's sink strength, not a fixed number.

Can the SN74LV8151PWRE4 interface directly with 1.8-V logic inputs?

The SN74LV8151PWRE4 inputs meet VIH/VIL thresholds for 1.8-V logic when operated at V_CC = 2.5 V: VIH(min) = 1.5 V and VIL(max) = 0.5 V, both compatible with 1.8-V CMOS output levels. However, the SN74LV8151PWRE4 itself does not operate below 2 V, so it cannot be powered from 1.8 V. It functions as a level translator - accepting 1.8-V signals while powered at ≥2 V and driving outputs compatible with downstream 2.5/3.3/5-V logic.

What is the thermal resistance θ_JA of the SN74LV8151PWRE4 in its TSSOP-24 package?

The SN74LV8151PWRE4 in the TSSOP-24 (PW) package has a junction-to-ambient thermal resistance (θ_JA) of 88°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad, 1-oz copper). Actual thermal performance depends on PCB layout - adding thermal vias under the exposed pad (if present) and increasing copper area can reduce effective θ_JA. The SN74LV8151PWRE4's low ICC (20 µA max) minimizes self-heating under static conditions.