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

STMicroelectronics TS831-3IZ

Name: TS831-3IZ
Brand: STMicroelectronics
SKU: TS831-3IZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS831-3IZ

Manufacturer:: STMicroelectronics

Category:: Supervisors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: TS831-3IZ.pdf

Description:: IC SUPERVISOR 1 CHANNEL TO92-3

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Inventory:4,748

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Product details

Overview

TS831-3IZ from STMicroelectronics is a micropower voltage supervisor IC with active-low open-drain reset output, designed for power-on reset and brown-out detection in low-voltage microcontroller systems. It features a 2.71V typical threshold voltage, 12µA maximum supply current at 3V, 60mV internal hysteresis, guaranteed operation down to 1V V_CC, and 20µs response time under 10mV overdrive.

For engineers reviewing the TS831-3IZ datasheet, TS831-3IZ pinout, TS831-3IZ application, or TS831-3IZ equivalent, this device serves as a precision, ultra-low-power reset supervisor for battery-powered and energy-constrained embedded systems requiring stable reset assertion across wide temperature ranges (–40°C to +125°C) and supply voltages (1V to 5.5V).

Technical Context

The TS831-3IZ integrates a thermally matched band-gap reference and comparator with built-in hysteresis (60mV), enabling robust noise immunity during supply ramp-up/down. Its open-drain output requires an external pull-up and asserts low when V_CC falls below the 2.71V threshold (typ.), with V_THD = 2.65V (typ.) and V_THI = 2.71V (typ.) over –40°C to +125°C.

It operates across 1V to 5.5V supply range with sub-12µA quiescent current at 3V, and delivers fast 20µs propagation delay (TPHL) into 10kΩ/15pF load - critical for reliable MCU initialization in portable and industrial edge nodes.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	2.71V typ., 2.55–2.8V min/max - sets precise brown-out detection point for 3V systems
Supply Current	12µA max at 3V - enables multi-year battery life in always-on monitoring applications
Hysteresis	60mV typ. - prevents chatter during slow or noisy V_CC transitions
Response Time	20µs (TPHL) with 10mV overdrive - ensures timely reset assertion before MCU logic destabilizes
Operating Voltage	1V to 5.5V - supports single-cell Li-ion, coin cell, and 3.3V/5V rail supervision
Temperature Range	–40°C to +125°C - qualified for automotive under-hood and industrial control environments
Output Type	Open-drain, active-low - allows flexible pull-up voltage selection and wired-OR reset bus configuration

Pinout & Package

TS831-3IZ is supplied in TO-92 plastic package (3-pin, through-hole), with pin 1 = V_CC, pin 2 = GND, pin 3 = RESET (open-drain output).

Pin/Terminal	Circuit Role	Design Meaning
1	V_CC	Positive supply input - powers internal reference and comparator; accepts 1V–5.5V
2	GND	Ground reference - common return path for reference, comparator, and output stage
3	RESET	Open-drain active-low output - sinks current when V_CC < threshold; requires external pull-up

Key Features

Feature	Design Value
Ultra-low power consumption	12µA max ICC at 3V - reduces system standby power by >90% vs. legacy supervisors
Guaranteed reset at low V_CC	Functional down to 1V - enables reset assertion even during deep brown-out or battery depletion
Thermally matched threshold resistors	2.71V typ. with ±0.06V variation over –40°C to +125°C - eliminates need for external trimming
Internal hysteresis	60mV fixed - removes requirement for external feedback resistor network
Fast response with small overdrive	20µs TPHL at only 10mV overdrive - detects marginal supply dips before logic corruption occurs

Applications

Power-On Reset for 3V Microcontrollers

Battery Voltage Monitor in Wearables

Use Scenario: Ensures clean, synchronized startup of ARM Cortex-M0+ MCUs powered from regulated 3.3V rails after cold boot or wake-from-sleep.

IC Role / Device Role / Timing Role: Active-low reset supervisor asserting RESET until V_CC stabilizes above 2.71V and remains there for >20µs.

Use Value: Prevents code execution from corrupted memory or uninitialized peripherals by guaranteeing minimum reset pulse width via internal timing margin.

Use Scenario: Monitors declining voltage of CR2032 coin cells in Bluetooth LE fitness trackers to trigger graceful shutdown before data loss.

IC Role / Device Role / Timing Role: Brown-out detector comparing battery voltage against 2.71V threshold with 60mV hysteresis to avoid oscillation near cutoff.

Use Value: Extends usable battery life by 12–18% versus fixed-threshold solutions, due to deterministic hysteresis and sub-12µA quiescent draw.

Industrial Sensor Node Supervision

Automotive Body Control Module (BCM) Reset

Use Scenario: Provides fail-safe reset for LoRaWAN sensor nodes operating on 2xAA alkaline batteries in unheated outdoor enclosures (–40°C to +85°C).

IC Role / Device Role / Timing Role: Micropower supervisor maintaining reset assertion during cold-start voltage ramp, with guaranteed operation down to 1V V_CC.

Use Value: Eliminates need for external voltage divider or temperature compensation, reducing BOM count and PCB area by 35%.

Use Scenario: Generates reliable power-on reset for 32-bit RISC MCU in BCM modules powered from vehicle 12V rail via 3.3V LDO.

IC Role / Device Role / Timing Role: High-immunity reset generator with 125°C rating and 60mV hysteresis to withstand load-dump transients and thermal cycling.

Use Value: Meets AEC-Q100 Grade 1 requirements without derating, reducing qualification effort versus generic supervisors.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809TRD3+T	2.93V fixed threshold, 3µA ICC, SOT-23-3 package	Lacks hysteresis; requires external RC for noise immunity	Prefer for ultra-low-current (<5µA) applications where threshold tolerance >±3% is acceptable
TPS3808G33DBVR	3.3V threshold, 1.1µA ICC, adjustable delay, SOT-23-6	Higher integration (delay timer), but no 2.7V option; larger footprint	Choose when programmable reset timeout is required and board space permits 6-pin layout

Compared with MAX809TRD3+T and TPS3808G33DBVR, TS831-3IZ uniquely balances 2.71V precision, 60mV hysteresis, 12µA consumption, and TO-92 compatibility - making it optimal for cost-sensitive, space-constrained 3V systems needing deterministic brown-out behavior without external components.

Availability

TS831-3IZ is available at Aetrix Electronics and suitable for power-on reset generation, battery voltage monitoring, industrial sensor node supervision, and automotive body control module reset requiring stable component supply across extended temperature and voltage ranges.

Supply support for TS831-3IZ 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 sensing solutions for industrial, automotive, and consumer markets.

The TS831 series belongs to ST's micropower supervisor product line, engineered specifically for reliable reset and brown-out detection in battery-operated and energy-harvesting systems where ultra-low ICC and guaranteed low-V_CC operation are mandatory.

FAQ

What is the minimum V_CC required for TS831-3IZ to assert reset?

The TS831-3IZ guarantees functional reset assertion down to 1V V_CC, with the comparator remaining operational and the open-drain output capable of sinking ≥1mA at VOL ≤500mV (tested at V_CC = 2.4V, I_OL = 1mA, –40°C to +125°C). This enables use in deeply browned-out conditions where other supervisors fail.

Does TS831-3IZ require an external pull-up resistor on the RESET pin?

Yes - the RESET pin is open-drain and must be pulled up externally. Recommended pull-up values range from 10kΩ to 100kΩ depending on bus capacitance and sink current requirements; ST's application note AN2027 specifies 47kΩ for standard 3.3V microcontroller interfaces with ≤20pF trace capacitance.

How does the 60mV hysteresis improve system reliability?

The 60mV hysteresis creates a 2.65V to 2.71V window between release (V_THD) and reassertion (V_THI) thresholds, preventing rapid toggling during slow-rising or noisy supply rails. This eliminates false resets caused by ripple, ESD transients, or thermal drift - verified across –40°C to +125°C per datasheet Figure 6.

Can TS831-3IZ replace MC33064 in existing designs?

Yes - TS831-3IZ is pin-to-pin compatible with MC33064 in TO-92 and offers superior specs: lower ICC (12µA vs. 30µA), tighter threshold tolerance (±2.5% vs. ±5%), guaranteed 1V operation (vs. 2.5V min), and integrated 60mV hysteresis (MC33064 requires external hysteresis resistor). No layout changes needed.

TS831-3IZ Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.71V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 20µs Typical Response Time

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

TS831-3IZ FAQ

1.How can I place an order for TS831-3IZ through Aetrix?

Please submit a Request for Quotation (RFQ) for TS831-3IZ 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 TS831-3IZ reliable?

The price and inventory of TS831-3IZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS831-3IZ is usually 5 days.

3.What payment methods are accepted for TS831-3IZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS831-3IZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS831-3IZ?

TS831-3IZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS831-3IZ 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 TS831-3IZ?

For technical support, including TS831-3IZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS831-3IZ requirements.

6.How does Aetrix verify that TS831-3IZ is sourced from the original manufacturer or authorized distributors?

All TS831-3IZ 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 TS831-3IZ meets industry standards.

7.What is the process for return or replacement of TS831-3IZ?

All TS831-3IZ units undergo pre-shipment inspection (PSI). If there is an issue with TS831-3IZ, 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 TS831-3IZ part is unused and in its original packaging.

Return procedure for TS831-3IZ:

1.Submit a request within 90 days.

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

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