Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

STMicroelectronics TL7705AIP/A

Name: TL7705AIP/A
Brand: STMicroelectronics
SKU: TL7705AIP/A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: TL7705AIP/A

Manufacturer:: STMicroelectronics

Category:: Supervisors

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: TL7705AIP/A.pdf

Description:: IC SUPERVISOR 1 CHAN 8MINI DIP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,489

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

TL7705AIP/A from STMicroelectronics is a precision supply voltage supervisor IC designed for microprocessor reset control, featuring a 4.5 V ±50 mV threshold voltage, true/complement reset outputs (RESET and RESET), 3.6–18 V operating supply range, -25°C to +85°C industrial temperature rating, and externally adjustable reset pulse width via CT pin (0.65–2.6 ms with 0.1 µF). It ensures reliable power-on and brownout reset in embedded controllers.

For engineers reviewing the TL7705AIP/A datasheet, TL7705AIP/A pinout, TL7705AIP/A application, or TL7705AIP/A equivalent, key selection considerations include its fixed 4.5 V sense threshold, dual active-high/active-low reset outputs, CT-based timing flexibility, REF output stability requirement (0.1 µF bypass), and Minidip-8 package compatibility with legacy board layouts.

Technical Context

The TL7705AIP/A implements a precision bandgap-based voltage reference (2.53 V typ) with temperature compensation to derive its 4.5 V SENSE threshold. Its internal comparator monitors supply voltage against this threshold and triggers reset assertion when VS drops below VT or during power-up until VS exceeds VT.

Reset pulse width is fully determined by an external capacitor on CT (pin 3), with t_po = 1.3 × 10⁴ × C_T (seconds), enabling design-specific timing without internal RC variation. The REF output (pin 1) supplies a stable 2.53 V reference requiring 0.1 µF local decoupling to reject fast transients.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.6 V to 18 V - supports wide-input industrial and automotive subsystems without external regulation
SENSE Threshold Voltage	4.5 V ±50 mV - precisely targets 5 V logic rails with hysteresis (15 mV) to prevent chatter during brownout recovery
Reference Voltage (REF)	2.53 V ±0.05 V - stable, temperature-compensated bandgap source for external circuit biasing or calibration
Reset Pulse Width (tpo)	0.65–2.6 ms with 0.1 µF CT - user-adjustable delay ensures sufficient time for CPU initialization before release
Operating Temperature	-25°C to +85°C - qualified for extended industrial environments without derating
Output Drive Strength	±16 mA - directly drives TTL/CMOS inputs or small FET gates without buffer stages
Supply Current	1.8–3.3 mA - ultra-low quiescent current enables use in always-on monitoring circuits

Pinout & Package

TL7705AIP/A is housed in an 8-pin Minidip (PDIP-8) package with 0.3-inch body width, 2.54 mm lead pitch, and through-hole mounting. Pin 1 is REF, Pin 2 is GND, Pin 3 is CT, Pin 4 is RESET, Pin 5 is RESIN, Pin 6 is SENSE, Pin 7 is VCC, Pin 8 is RESET.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (REF)	Reference Output	2.53 V temperature-stable voltage source requiring 0.1 µF bypass to ground for noise immunity
Pin 2 (GND)	Ground Reference	System return path for all internal comparators, reference, and output drivers
Pin 3 (CT)	Timing Capacitor Input	Connects external capacitor to set reset pulse width per t_po = 1.3×10⁴×C_T
Pin 4 (RESET)	Active-High Reset Output	Open-collector compatible output asserted high during reset; sinks current when active
Pin 5 (RESIN)	Manual Reset Input	Active-low input; pulling low forces immediate reset assertion regardless of supply voltage
Pin 6 (SENSE)	Supply Monitoring Input	Monitors external rail (e.g., 5 V) - asserts reset if voltage falls below 4.5 V threshold
Pin 7 (VCC)	Power Supply Input	Primary supply connection; powers internal reference, comparator, and output stages
Pin 8 (RESET)	Active-Low Reset Output	Complementary to Pin 4; asserted low during reset; drives standard logic inputs directly

Key Features

Feature	Design Value
Dual Complementary Reset Outputs	Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems
Externally Adjustable Reset Timeout	CT pin enables precise, board-level tuning of reset duration to match specific MCU boot requirements
Temperature-Compensated Reference	2.53 V REF output maintains ±0.05 V accuracy over -25°C to +85°C, enabling stable external analog functions
Wide Supply Range with Low Quiescent Current	Operates from 3.6 V to 18 V while drawing only 1.8–3.3 mA, reducing system power overhead
Hysteresis-Stabilized Threshold Detection	15 mV hysteresis at SENSE input prevents oscillation during slow-rising or noisy supply transitions

Applications

Industrial PLC Controller

Automotive Body Control Module

Use Scenario: Power sequencing and brownout detection in programmable logic controller mainboards.

IC Role / Device Role / Timing Role: Primary supply monitor and reset generator ensuring deterministic MCU startup after AC/DC converter ramp-up or battery sag.

Use Value: 4.5 V threshold aligns with 5 V I/O rail; CT-adjustable pulse guarantees >2 ms reset hold time required by ARM Cortex-M4 boot ROM.

Use Scenario: Supervision of 5 V microcontroller supply in door module ECUs exposed to load-dump transients.

IC Role / Device Role / Timing Role: Brownout detector with hysteresis preventing false resets during 12 V battery dips to 9 V.

Use Value: 15 mV hysteresis and -25°C to +85°C rating ensure robust operation across vehicle thermal cycles and electrical noise.

Medical Infusion Pump

Point-of-Sale Terminal

Use Scenario: Safety-critical reset management for ARM-based pump controller with isolated power domains.

IC Role / Device Role / Timing Role: Dual-reset-output supervisor providing independent reset signals to MCU and safety monitor ASIC.

Use Value: Complementary RESET/RESET outputs enable direct connection to both devices without level-shifting or inversion logic.

Use Scenario: Reliable power-on reset in retail terminals using legacy x86-compatible SoCs with strict reset timing windows.

IC Role / Device Role / Timing Role: Precision reset generator with adjustable timeout matching BIOS POST sequence requirements.

Use Value: CT-based timing allows field-tuning to match exact motherboard reset hold time specifications (e.g., 1.5 ms ±0.2 ms).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3808G33DBVR	Fixed 3.3 V threshold; internal timer (200 ms typ); no REF output; SOT-23-6 package	Suitable for 3.3 V systems only; lacks adjustable timing and reference output	Select when board space is constrained and 3.3 V supervision suffices without external timing or REF needs
MAX691CPD+	5 V threshold; internal 200 ms timer; no CT adjustment; includes watchdog timer; PDIP-16 package	Broader feature set (watchdog), but larger footprint and fixed timing limits design flexibility	Select when watchdog functionality is required alongside reset, and board area permits 16-pin DIP

Compared with TPS3808G33DBVR and MAX691CPD+, TL7705AIP/A uniquely offers adjustable reset timing, a stable 2.53 V reference output, and precise 4.5 V threshold in a compact 8-pin Minidip-making it optimal for legacy 5 V microcontroller designs needing field-tunable reset behavior and analog support.

Availability

TL7705AIP/A is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL7705AIP/A 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The TL7700A series belongs to ST's legacy analog supervisor product line, engineered specifically for deterministic power-on and brownout reset generation in microprocessor-based systems where reliability, adjustability, and wide supply tolerance are critical.

FAQ

What is the function of the REF pin (Pin 1) on TL7705AIP/A?

The REF pin provides a stable, temperature-compensated 2.53 V reference voltage derived from an internal bandgap circuit. It must be bypassed with a 0.1 µF capacitor to ground to suppress supply noise and ensure accurate threshold sensing. This output can also serve external analog circuits requiring a precision voltage source, such as ADC references or sensor biasing networks.

How is the reset pulse width determined, and what capacitor value yields ~1.3 ms?

The reset pulse width (t_po) is calculated as t_po = 1.3 × 10⁴ × C_T, where C_T is in farads. For a nominal 1.3 ms pulse, solve 0.0013 = 1.3 × 10⁴ × C_T, giving C_T = 0.1 µF. This matches the typical value specified in the datasheet and is verified across -25°C to +85°C with ±20% tolerance due to capacitor drift and process variation.

Can TL7705AIP/A supervise a 3.3 V supply rail?

No - TL7705AIP/A has a fixed 4.5 V SENSE threshold optimized for 5 V systems. Applying it to a 3.3 V rail would cause continuous reset assertion since the supply never reaches the threshold. For 3.3 V supervision, use TL7703A (3.3 V threshold) or modern alternatives like TPS3808G33, which are explicitly rated for that voltage.

Is the TL7705AIP/A pin-compatible with other TL7700A-series variants?

Yes - all TL7700A-series parts (e.g., TL7702A, TL7705A, TL7709A) share identical Minidip-8 pinouts and functional assignments. Only the internal SENSE threshold differs (2.5 V, 4.5 V, 9 V, etc.), so swapping requires verifying that the new threshold matches the target supply rail and that external resistor networks (if used) remain compatible.

TL7705AIP/A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.55V

Output:: Open Drain or Open Collector

Reset:: Active High/Active Low

Reset Timeout:: 1µs Maximum Propagation Delay

Operating Temperature:: -25°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-Mini DIP

TL7705AIP/A FAQ

1.How can I place an order for TL7705AIP/A through Aetrix?

Please submit a Request for Quotation (RFQ) for TL7705AIP/A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TL7705AIP/A reliable?

The price and inventory of TL7705AIP/A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7705AIP/A is usually 5 days.

3.What payment methods are accepted for TL7705AIP/A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7705AIP/A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TL7705AIP/A?

TL7705AIP/A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TL7705AIP/A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TL7705AIP/A?

For technical support, including TL7705AIP/A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7705AIP/A requirements.

6.How does Aetrix verify that TL7705AIP/A is sourced from the original manufacturer or authorized distributors?

All TL7705AIP/A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TL7705AIP/A meets industry standards.

7.What is the process for return or replacement of TL7705AIP/A?

All TL7705AIP/A units undergo pre-shipment inspection (PSI). If there is an issue with TL7705AIP/A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TL7705AIP/A part is unused and in its original packaging.

Return procedure for TL7705AIP/A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…