Texas Instruments SN74LVC3G97BQAR

Overview

SN74LVC3G97BQAR from Texas Instruments is a configurable triple-function logic gate IC with Schmitt-trigger inputs, operating from 1.1V to 3.6V supply, supporting MUX/AND/OR/NAND/NOR/inverter/non-inverter logic modes per channel, and featuring 5.5V-tolerant inputs for robust interfacing in mixed-voltage systems such as power sequencing and signal enable circuits.

For engineers reviewing the SN74LVC3G97BQAR datasheet, SN74LVC3G97BQAR pinout, SN74LVC3G97BQAR application, or SN74LVC3G97BQAR equivalent, key selection considerations include its 14-pin WQFN (BQA) package, 3-channel independent configuration, Schmitt-trigger noise immunity (ΔVT ≥ 0.07 V), propagation delay down to 5.6 ns at 3.3V, and ±24 mA output drive capability.

Technical Context

The SN74LVC3G97BQAR implements three independent 3-input configurable logic blocks, each mapping A/B/C inputs to Y output via an 8-row function table. Each channel supports seven selectable logic functions determined by input state combinations-not programmable via control pins but configured statically by wiring.

Its Schmitt-trigger inputs provide hysteresis (ΔVT = 0.07–1.2 V depending on VCC), enabling reliable operation with slow-rising or noisy signals, while balanced CMOS push-pull outputs deliver symmetrical sourcing/sinking up to ±24 mA at 3V, with 5.5V input tolerance allowing direct interface to higher-voltage peripherals without level shifters.

Key Specifications

Pinout & Package

SN74LVC3G97BQAR uses a 14-pin WQFN package (BQA) with 3 mm × 2.5 mm body size, exposed thermal pad (internally connected to GND or left floating), and 0.5 mm pitch. Pin 1 is A1; pin 7 is GND; pin 14 is VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar configurable logic gate applications.

Compared with SN74LVC3G97BQAR, SN74LVC1G97DBVR offers identical logic flexibility per channel but requires three devices for triple functionality-increasing board area and assembly cost-while SN74LVC3G04DCUR lacks both configurability and Schmitt inputs, limiting use to clean-signal environments.

Availability

SN74LVC3G97BQAR is available at Aetrix Electronics and suitable for power sequencing control, signal enable gating, multi-source fault combining, and noise-immune logic interfacing requiring stable component supply across automotive, industrial, and embedded computing programs.

Supply support for SN74LVC3G97BQAR 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, precision, and energy efficiency across industrial, automotive, and communications markets.

The SN74LVC3G97BQAR belongs to TI's LVC low-voltage logic family, designed specifically for flexible, noise-immune signal conditioning in space-constrained, mixed-voltage embedded systems where traditional fixed-function gates lack adaptability.

FAQ

What logic functions does the SN74LVC3G97BQAR support per channel?

The SN74LVC3G97BQAR supports seven configurable logic functions per channel-MUX, AND, OR, NAND, NOR, inverter, and non-inverter-determined by the eight possible combinations of its three inputs (A, B, C). No external programming is required; configuration is static and defined by input wiring per the function table in the datasheet. Each of the three channels operates independently, enabling heterogeneous logic implementation within a single 14-pin WQFN package.

Does the SN74LVC3G97BQAR require external pull-up or pull-down resistors on unused inputs?

Yes, unused inputs on the SN74LVC3G97BQAR must be terminated to either VCC or GND to prevent floating states that could cause undefined outputs or increased power consumption. While Schmitt-trigger inputs tolerate slow transitions, they do not eliminate the need for proper biasing. A 10-kΩ resistor is commonly used for pull-up/pull-down due to compatibility with leakage current limits (±5 µA max) and transition rate requirements. Direct connection is acceptable if the input is permanently unused.

Can the SN74LVC3G97BQAR operate with a 5 V supply?

No, the SN74LVC3G97BQAR has a maximum recommended supply voltage of 3.6 V and absolute maximum VCC of 6.5 V-but sustained operation above 3.6 V violates its Recommended Operating Conditions and risks parametric failure or reduced reliability. However, its inputs are 5.5 V tolerant, meaning it can safely accept 5 V logic signals while powered from 1.8 V or 3.3 V, eliminating level shifters in mixed-voltage interfaces.

How does the Schmitt-trigger input improve noise immunity on the SN74LVC3G97BQAR?

The Schmitt-trigger input on the SN74LVC3G97BQAR provides hysteresis (ΔVT), with minimum values ranging from 0.07 V at 1.1 V supply to 1.2 V at 3.6 V. This means the input threshold for detecting a rising edge (VT+) is significantly higher than for a falling edge (VT−), preventing multiple toggles caused by noise or slow edges. For example, at 3.3 V, noise spikes under ~1.2 V peak-to-peak will not trigger false transitions-critical for interfacing with thermistors, comparators, or long PCB traces.

What is the thermal pad connection recommendation for the SN74LVC3G97BQAR (BQA package)?

The exposed thermal pad on the SN74LVC3G97BQAR's BQA package should be connected to the PCB ground plane using multiple thermal vias to optimize heat dissipation. TI specifies RθJB = 70.9 °C/W with this connection, significantly lower than the 93.8 °C/W for the TSSOP variant. Leaving the pad unconnected or floating degrades thermal performance and may limit sustained output current capability. Do not connect the pad to any signal or supply other than GND.