Texas Instruments TL7757ID

Overview

TL7757ID from Texas Instruments is a supply-voltage supervisor and precision voltage detector designed for microcomputer and microprocessor systems. It monitors VCC for undervoltage conditions, asserts active-low RESET below 4.55 V ±120 mV threshold, delivers 20 mA sink capability, operates from −40°C to 85°C, and defines RESET output down to VCC = 1 V - enabling reliable power-on reset in industrial control units.

For engineers reviewing the TL7757ID datasheet, TL7757ID pinout, TL7757ID application, or TL7757ID equivalent, this page provides verified technical context, SOIC-8 package mapping, threshold hysteresis (40–60 mV), low standby current (20 µA), and real-world use cases in embedded reset management where precise 4.55 V detection and temperature-stable reset assertion are required.

Technical Context

The TL7757ID implements a comparator-based undervoltage detection architecture with built-in hysteresis to prevent oscillatory reset behavior during slow-rising or noisy supply rails. Its internal reference and resistor ladder network define a precise negative-going threshold of 4.55 V ±120 mV across −40°C to 85°C.

It features open-drain RESET output with 20 mA sink capability, propagation delays under 5 µs (tPLH/tPHL), and guaranteed operation down to VCC = 1 V - ensuring deterministic reset assertion during brown-out and power-up sequences in safety-critical embedded systems.

Key Specifications

Pinout & Package

TL7757ID is housed in an 8-pin SOIC (D) package per JEDEC MS-012 variation AA, with 1.27 mm pitch, 3.94 mm width, and 1.75 mm max height. Pin 1 is marked by a beveled corner or dot; device orientation follows standard Q1 quadrant tape placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326LT46D3+T, TL7757ID offers exact 4.55 V detection with hysteresis and open-drain output optimized for legacy 5 V microcontroller reset interfaces - making it the preferred choice where pin-level compatibility with existing designs and proven industrial reliability are critical.

Availability

TL7757ID is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply with long-term lifecycle support.

Supply support for TL7757ID 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.

The TL7757ID belongs to TI's legacy voltage supervisor product line, engineered specifically for robust, cost-effective 5 V system reset management in industrial and automotive applications where precision threshold and wide temperature operation are essential.

FAQ

What is the exact reset threshold voltage of TL7757ID and how does it vary with temperature?

The TL7757ID has a nominal negative-going reset threshold voltage of 4.55 V with a tolerance of ±120 mV over the full operating range of −40°C to +85°C. Electrical characteristics tables confirm VIT− remains within 4.4 V to 4.7 V across temperature, and Figure 10 shows typical drift of less than ±5 mV from 25°C to 85°C - supporting stable 5 V rail supervision without recalibration.

Does TL7757ID require an external pull-up resistor on the RESET pin?

Yes, TL7757ID features an open-drain RESET output and requires an external pull-up resistor to VCC or another logic rail. The datasheet specifies 20 mA sink capability, and typical designs use a 10 kΩ pull-up to 5 V - ensuring sufficient rise time while maintaining compatibility with standard microcontroller reset inputs that expect active-low asserted signals.

Can TL7757ID operate reliably during power-up when VCC rises slowly?

Yes, TL7757ID is explicitly designed for slow-ramp scenarios: RESET is defined as soon as VCC exceeds 1 V, and propagation delays remain under 5 µs even with slew rates ≤5 V/µs (per Figures 2–3). This guarantees deterministic reset assertion before the host MCU exits its internal power-on reset state - critical for systems powered by unregulated supplies or high-capacitance rails.

What is the maximum allowable supply voltage for TL7757ID?

The absolute maximum supply voltage for TL7757ID is 20 V, but the recommended operating range is 1 V to 7 V per the datasheet's "Recommended Operating Conditions" table. Operation above 7 V risks exceeding internal bias limits and is not characterized - sustained use beyond 7 V may degrade long-term reliability or cause undefined output behavior.

Is TL7757ID RoHS-compliant and what is its moisture sensitivity level?

Yes, TL7757ID is RoHS-compliant (lead finish: NiPdAu) and rated MSL Level-1 at 260°C with unlimited floor life. Per TI's Package Option Addendum, it ships in SOIC (D) packaging with tape-and-reel or tube formats, and the "NIPDAU" lead finish meets JEDEC J-STD-020 standards for lead-free reflow compatibility without special baking requirements.