Texas Instruments TL7702AID

Overview

TL7702AID from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for microprocessor and embedded systems. It features a 2.53 V (typ) undervoltage detection threshold at SENSE, operates from 3.5 V to 18 V supply, delivers dual active-high/active-low RESET outputs, and supports externally adjustable reset pulse duration via CT capacitor. It is used in industrial control units requiring reliable power-on and brownout reset sequencing.

For engineers reviewing the TL7702AID datasheet, TL7702AID pinout, TL7702AID application, or TL7702AID equivalent, key selection criteria include its −40°C to +85°C industrial temperature grade, SOIC-8 package, dual complementary reset outputs, 2.53 V precision trip point, and compatibility with low-voltage logic systems where stable 2.5 V reference monitoring is required.

Technical Context

The TL7702AID integrates a temperature-compensated bandgap voltage reference (2.53 V ±5 mV), a high-precision comparator with hysteresis (10 mV), and an RC-based delay timer controlled by external capacitor CT. Its SENSE input monitors system supply voltage, triggering RESET assertion when voltage falls below V_IT− = 2.53 V and deasserting after a programmable delay once voltage exceeds V_IT+.

It employs open-collector RESET and RESET̅ outputs, requiring external pull-up resistors, and includes internal circuitry to maintain defined output states during power-down until V_CC drops below 2 V. The REF output provides a stable 2.53 V reference usable for external biasing or calibration.

Key Specifications

Pinout & Package

TL7702AID is housed in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm), RoHS-compliant, with NIPDAU lead finish and Moisture Sensitivity Level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supply-voltage supervisor applications.

Compared with TPS3808G125DBVR and MAX6326UT25+T, TL7702AID offers unique value in industrial designs requiring field-adjustable reset timing, a precision 2.53 V reference for system calibration, and dual complementary outputs for redundancy or logic flexibility-without sacrificing temperature stability or supply range.

Availability

TL7702AID is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and network infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL7702AID 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 power management technologies, with decades of experience in high-reliability industrial and automotive ICs.

The TL77xxA product line was engineered specifically as precision, wide-supply-voltage supervisors for microcomputer and microprocessor reset control-emphasizing threshold accuracy, temperature stability, and robust power sequencing in harsh environments.

FAQ

What is the exact undervoltage detection threshold voltage for TL7702AID?

The TL7702AID has a nominal negative-going input threshold voltage (V_IT−) of 2.53 V at 25°C, with a guaranteed range of 2.48 V to 2.58 V across the full −40°C to +85°C operating temperature range. This precise 2.53 V threshold is factory-trimmed and temperature-compensated, making TL7702AID ideal for direct monitoring of 2.5 V system rails without external resistor dividers.

Does TL7702AID provide a usable voltage reference output?

Yes, TL7702AID provides a dedicated REF pin (Pin 1) that delivers a stable, temperature-compensated 2.53 V reference voltage with ±5 mV tolerance at 25°C. This output can be used to bias sensors, calibrate ADCs, or serve as a precision reference for external circuitry-eliminating the need for a separate reference IC in many designs.

How is the reset pulse duration set on TL7702AID?

The reset pulse duration on TL7702AID is set externally using capacitor CT connected to Pin 3. The relationship is t_d ≈ 1.3 × 10⁴ × C_T, where C_T is in farads and t_d is in seconds. For example, a 0.1 µF capacitor yields ~1.3 ms delay. TL7702AID requires this capacitor to be placed close to the pin and shielded from noise to ensure timing accuracy.

What package and temperature grade does TL7702AID use?

TL7702AID is supplied in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm) and is rated for operation from −40°C to +85°C. Its part marking is "7702AI", and it carries Level-1 moisture sensitivity rating (MSL-1), allowing unlimited floor life and standard 260°C reflow profile compatibility.

Can TL7702AID monitor voltages other than 2.5 V?

Yes, TL7702AID can monitor higher supply voltages by connecting the SENSE input through an external resistor divider. The internal comparator threshold remains fixed at 2.53 V, so the divider scales the target rail down to match. For example, to supervise a 12 V rail, use R1 = 3.74 kΩ and R2 = 1 kΩ (top/bottom) to yield 2.53 V at SENSE when V_IN = 12 V. TL7702AID's high-impedance SENSE input minimizes loading error.