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 TS831-5IZ

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

Compare

Part No.:: TS831-5IZ

Manufacturer:: STMicroelectronics

Category:: Supervisors

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

Datasheet:: TS831-5IZ.pdf

Description:: IC SUPERVISOR 1 CHANNEL TO92-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,271

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

Product details

Overview

TS831-5IZ from STMicroelectronics is an ultra-low-power voltage supervisor IC with active-low open-drain reset output, precision 4.33 V threshold (typ.), 12 µA supply current at 5 V, guaranteed operation down to 1 V supply, and 20 µs response time under 10 mV overdrive - used for power-on reset generation in microcontroller systems.

For engineers reviewing the TS831-5IZ datasheet, TS831-5IZ pinout, TS831-5IZ application, or TS831-5IZ equivalent, key selection criteria include reset threshold accuracy across temperature, ultra-low ICC stability at low VCC, open-drain sink capability up to 20 mA, and compatibility with MC33064/MC33164-based legacy designs.

Technical Context

The TS831-5IZ integrates a thermally matched band-gap reference and comparator with internal hysteresis (100 mV typ.) to prevent false resets during noisy supply transients. Its threshold is trimmed to 4.33 V (VTHI) and 4.46 V (VTHD) over −40°C to +125°C, enabling reliable detection of brown-out conditions in battery-powered embedded systems.

It operates from 1 V to 5.5 V supply, delivers 20 µs propagation delay (TPHL) with 10 mV overdrive into 10 kΩ/15 pF load, and features rail-to-rail input monitoring without external components - all while consuming only 12 µA at 5 V and 25°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	4.33 V (typ.) - precise detection point for 5 V system brown-out, stable over −40°C to +125°C
Supply Current	12 µA max at 5 V - enables multi-year battery life in always-on supervisory applications
Response Time	20 µs (TPHL) - fast enough to assert reset before microcontroller executes corrupted code
Hysteresis	100 mV (typ.) - suppresses chatter during slow-rising/falling VCC transitions
Output Type	Open-drain - supports flexible pull-up to any logic rail (e.g., 3.3 V or 5 V) and wired-OR reset buses
Min Operating Voltage	1 V - ensures valid reset assertion even during deep brown-out or supercapacitor discharge
Sink Current	20 mA (max) - drives standard 10 kΩ pull-up resistors with <1 V VOL at 8 mA load

Pinout & Package

TS831-5IZ is supplied in TO-92 plastic package (3-pin, through-hole), with pin 1 = V_IN, pin 2 = GND, pin 3 = RESET (open-drain output).

Pin/Terminal	Circuit Role	Design Meaning
1	V_IN	Monitored supply input - connects directly to system VCC for reset generation
2	GND	Analog ground reference - must be tied to clean system ground plane for threshold accuracy
3	RESET	Active-low open-drain output - requires external pull-up; asserts low when V_IN < V_TH

Key Features

Feature	Design Value
Ultra-low ICC	12 µA max at 5 V - eliminates need for shutdown sequencing in energy-constrained nodes
Guaranteed 1 V operation	Valid reset assertion down to 1 V supply - supports wide-range Li-ion/Li-SOCl₂ battery discharge profiles
Thermally matched threshold	4.33 V typ. with ±220 mV total variation over −40°C to +125°C - no external trimming required
Integrated hysteresis	100 mV typ. - removes need for external feedback resistor network and PCB space
MC33064/MC33164 pin-compatible	Direct drop-in replacement in existing designs - same pinout, footprint, and functional behavior

Applications

Microcontroller Power-On Reset

Battery-Powered Sensor Node Supervision

Use Scenario: Microcontroller startup sequence requiring reliable reset until VCC stabilizes above 4.3 V.

IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset signal until monitored supply exceeds 4.33 V threshold.

Use Value: Prevents CPU lockup or firmware corruption by ensuring minimum VCC before instruction fetch begins.

Use Scenario: Long-life IoT sensor node powered by coin cell or energy harvester with variable output.

IC Role / Device Role / Timing Role: Brown-out detector triggering controlled shutdown when supply drops below 4.33 V.

Use Value: Enables deterministic state save and graceful sleep entry before supply collapse.

Industrial PLC I/O Module Reset

Automotive Body Control Module (BCM) Monitoring

Use Scenario: DIN-rail mounted PLC module subject to 24 V DC bus ripple and cold-cranking dips.

IC Role / Device Role / Timing Role: Resets digital logic when 5 V LDO output falls below 4.33 V due to upstream rail disturbance.

Use Value: Maintains deterministic recovery after transient undervoltage events without manual intervention.

Use Scenario: BCM operating from vehicle battery (9–16 V) with LDO-regulated 5 V domain.

IC Role / Device Role / Timing Role: Monitors 5 V rail and asserts reset if cold-cranking drops VCC below 4.33 V.

Use Value: Guarantees MCU reset during engine start, preventing spurious CAN message transmission.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC33064DR2G	Threshold 4.5 V (±2.5%), ICC = 25 µA, hysteresis 120 mV, SO-8 only	Higher threshold and current - less suitable for tight 5 V margin systems or ultra-low-power designs	Prefer where legacy SO-8 layout exists and 4.5 V trip is acceptable
TLV803EB33DBZR	Threshold 3.3 V (fixed), ICC = 270 nA, SOT-23-3, no hysteresis - requires external RC	Lower threshold and nanoamp current - targets 3.3 V systems, not 5 V brown-out detection	Prefer for 3.3 V domains with extreme battery life requirements; not interchangeable

Compared with MC33064DR2G and TLV803EB33DBZR, TS831-5IZ uniquely balances 4.33 V precision, 12 µA ultra-low ICC, 100 mV hysteresis, and TO-92 through-hole compatibility - making it optimal for cost-sensitive, high-reliability 5 V microcontroller reset applications.

Availability

TS831-5IZ is available at Aetrix Electronics and suitable for microcontroller power-on reset, battery-powered sensor supervision, and industrial PLC I/O modules requiring stable component supply with long-term manufacturability.

Supply support for TS831-5IZ 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 TS831 series belongs to ST's precision voltage supervisor product line, engineered specifically for robust, low-power reset generation in harsh-temperature embedded systems with minimal external components.

FAQ

What is the maximum sink current capability of TS831-5IZ?

The TS831-5IZ guarantees 20 mA sink current at VCC = 4 V and −40°C to +85°C, with typical VOL of 450 mV at 8 mA. At full 20 mA, VOL remains ≤1.3 V across temperature, supporting standard 10 kΩ pull-up resistors on 5 V rails.

Does TS831-5IZ require an external pull-up resistor?

Yes - its open-drain RESET output requires an external pull-up resistor to the target logic rail (e.g., 3.3 V or 5 V). Recommended values range from 4.7 kΩ to 10 kΩ, selected based on sink current, VOL budget, and rise time requirements per the "Voltage output low vs Isink" curves in the datasheet.

How does hysteresis improve noise immunity in TS831-5IZ?

TS831-5IZ provides 100 mV typical hysteresis between rising (4.33 V) and falling (4.46 V) thresholds. This prevents oscillatory reset toggling during slow or noisy VCC transitions near the trip point, eliminating false resets without needing external positive feedback components.

Can TS831-5IZ operate from a 3.3 V supply?

No - TS831-5IZ is specified for 4.33 V threshold and requires VCC ≥1 V to function, but its threshold is fixed for 5 V systems. For 3.3 V supervision, ST offers TS831-3IZ (2.71 V threshold); using TS831-5IZ on 3.3 V would result in permanent reset assertion since VCC never exceeds VTH.

TS831-5IZ 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:: 4.33V

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

TS831-5IZ FAQ

1.How can I place an order for TS831-5IZ through Aetrix?

Please submit a Request for Quotation (RFQ) for TS831-5IZ 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 TS831-5IZ reliable?

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

3.What payment methods are accepted for TS831-5IZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS831-5IZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS831-5IZ?

TS831-5IZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS831-5IZ 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 TS831-5IZ?

For technical support, including TS831-5IZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS831-5IZ requirements.

6.How does Aetrix verify that TS831-5IZ is sourced from the original manufacturer or authorized distributors?

All TS831-5IZ 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 TS831-5IZ meets industry standards.

7.What is the process for return or replacement of TS831-5IZ?

All TS831-5IZ units undergo pre-shipment inspection (PSI). If there is an issue with TS831-5IZ, 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 TS831-5IZ part is unused and in its original packaging.

Return procedure for TS831-5IZ:

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…