My Inquiry
My Account
STMicroelectronics TS831-4IZT
,TO-226_straightlead.jpg)
- Part No.:
- TS831-4IZT
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TS831-4IZT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,021
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TS831-4IZT from STMicroelectronics is a micropower voltage supervisor IC with active-low open-drain reset output, precision 4.50 V threshold (typ.), 100 mV internal hysteresis, and guaranteed operation down to 1 V supply. It serves as a power-on reset generator for microcontrollers in battery-powered industrial sensors and low-voltage embedded systems.
For engineers reviewing the TS831-4IZT datasheet, TS831-4IZT pinout, TS831-4IZT application, or TS831-4IZT equivalent, key selection criteria include ultra-low 12 µA supply current, fast 20 µs response under 10 mV overdrive, reset validity down to 1 V VCC, and compatibility with MC33064/MC33164-based designs requiring stable low-power supervision.
Technical Context
The TS831-4IZT integrates a thermally matched band-gap reference and comparator with fixed internal resistor network setting VTHI = 4.50 V (typ.) and VHYS = 100 mV (typ.). Its open-drain output sinks up to 8 mA at VCC = 4 V and Tamb ≤ +85°C, with VOL ≤ 800 mV under those conditions.
Designed for supply monitoring in constrained environments, it operates across –40°C to +125°C with full electrical characterization, supports pull-up resistor selection via published VOL vs. ISINK curves, and requires no external components for basic reset generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.50 V typical; ensures reliable reset assertion during 5 V rail brownout or startup. |
| Supply Current | 12 µA max at VCC = 5 V; enables multi-year battery life in always-on monitoring nodes. |
| Response Time | 20 µs high-to-low with 10 mV overdrive; detects rapid supply dips before MCU corruption occurs. |
| Hysteresis | 100 mV typical; prevents chatter during slow-rising/falling VCC transitions near threshold. |
| Min Operating VCC | 1 V; guarantees valid reset signal even during deep brownout or supercapacitor discharge. |
| Output Type | Open-drain; allows wired-OR configuration and flexible pull-up voltage selection (e.g., 3.3 V or 5 V). |
| VOL @ 8 mA | ≤ 800 mV at VCC = 4 V, Tamb ≤ +85°C; ensures strong logic-low drive into standard CMOS reset inputs. |
Pinout & Package
TS831-4IZT is supplied in TO-92 plastic package (Z suffix), with 3-pin through-hole mounting and standardized lead spacing per JEDEC TO-92 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Open-drain reset output | Active-low signal; must be pulled up externally to define logic-high level and sink capability. |
| 2 (GND) | Ground reference | Return path for internal reference and comparator; requires low-impedance connection to system ground plane. |
| 3 (IN) | Supply voltage input | Monitored VCC node; connects directly to rail being supervised-no series resistance or filtering required. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 12 µA max at 5 V enables >10-year coin-cell operation in IoT endpoint devices. |
| Precision threshold | 4.50 V ±2% over temperature ensures consistent reset point across automotive and industrial ambient ranges. |
| Guaranteed 1 V operation | Valid reset assertion down to 1 V VCC supports energy-harvesting and backup-supply applications. |
| Internal hysteresis | 100 mV eliminates need for external feedback resistors and improves noise immunity on noisy PCBs. |
| Pin-compatible legacy fit | Direct replacement for MC33064/MC33164 in existing designs without layout change. |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor operating from CR2032 cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Power-on reset generator and brownout detector ensuring clean MCU initialization after cold start or voltage sag. Use Value: 12 µA quiescent current extends battery life beyond 7 years; 1 V minimum operation maintains reset integrity during final discharge phase. |
Use Scenario: Low-voltage subsystem (e.g., door module) powered by vehicle battery with transient load dump events. IC Role / Device Role / Timing Role: Supervisory watchdog that asserts reset during battery undervoltage (<4.5 V) to prevent firmware corruption. Use Value: 100 mV hysteresis rejects noise from alternator ripple; –40°C to +125°C rating matches under-hood thermal requirements. |
| Medical Wearable Monitor | Smart Meter Auxiliary Power Rail |
Use Scenario: ECG patch using supercapacitor backup to maintain real-time clock and memory during main battery swap. IC Role / Device Role / Timing Role: Reset supervisor for auxiliary 3.3 V rail derived from supercapacitor, asserting reset when voltage falls below 4.5 V. Use Value: Fast 20 µs response captures sub-millisecond dips; open-drain output interfaces cleanly with mixed-voltage SoC reset inputs. |
Use Scenario: Utility meter with isolated DC-DC converter powering metrology ASIC from 24 V AC line. IC Role / Device Role / Timing Role: Primary reset source for metrology processor, triggered by 5 V rail deviation due to transformer saturation or rectifier fault. Use Value: TO-92 package enables compact placement near power stage; 4.50 V threshold aligns with EN 50470-3 undervoltage trip requirements. |
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 max, no guaranteed operation below 2.5 V. | Lacks 1 V operation; unsuitable for supercapacitor or energy-harvesting backup rails. | Select when legacy footprint compatibility is critical and supply never drops below 2.5 V. |
| TPS3808G33DBVR | Threshold = 3.3 V (fixed), ICC = 1.8 µA, push-pull output, requires external capacitor for delay. | Lower threshold and push-pull output require circuit redesign; not drop-in compatible. | Choose only if 3.3 V reset level and ultra-low ICC outweigh footprint and functional changes. |
Compared with MC33064DR2G and TPS3808G33DBVR, TS831-4IZT uniquely combines 4.5 V precision threshold, 1 V minimum operation, and TO-92 compatibility-making it optimal for cost-sensitive, space-constrained brownout detection where legacy fit and deep undervoltage coverage are mandatory.
Availability
TS831-4IZT is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, medical wearables, and smart meter auxiliary power rails requiring stable component supply and long-term manufacturability.
Supply support for TS831-4IZT 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 belongs to ST's micropower supervisor product line, engineered specifically for ultra-low-power reset generation in battery-operated and energy-constrained systems where reliability across wide temperature and voltage ranges is essential.
FAQ
What is the recommended pull-up resistor value for TS831-4IZT's open-drain output?
For VCC = 5 V and maximum sink current of 8 mA, a 10 kΩ pull-up provides ~4.2 V logic-high while keeping VOL ≤ 800 mV. Lower values (e.g., 4.7 kΩ) improve noise immunity but increase static current; higher values (>47 kΩ) risk marginal rise time in noisy environments. Refer to Figure 7 in the datasheet for VOL vs. ISINK curves across temperature.
Does TS831-4IZT require an external capacitor for stability or delay?
No. TS831-4IZT contains no internal delay circuitry and does not require an external capacitor. Its 20 µs response is inherent to the comparator design. Adding capacitance at the OUT pin will degrade response time and is not recommended unless intentional debouncing is needed-and then only with careful RC analysis per application note AN2012.
Can TS831-4IZT monitor a 3.3 V rail?
No-it is optimized for 4.5 V threshold supervision. Using it on a 3.3 V rail would cause continuous reset assertion since VCC < VTHI. For 3.3 V systems, select TS831-3IZT (2.71 V threshold) or TS831-5IZT (4.33 V threshold) depending on required margin and tolerance.
Is TS831-4IZT qualified for automotive applications?
Yes. The "I" grade (–40°C to +125°C) and AEC-Q100 stress testing compliance make TS831-4IZT suitable for non-safety-critical automotive modules such as body control units, lighting controllers, and HVAC subsystems-provided system-level ASIL decomposition confirms no safety mechanism dependency.
TS831-4IZT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.5V
- 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
TS831-4IZT FAQ
1.How can I place an order for TS831-4IZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS831-4IZT 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 TS831-4IZT reliable?
The price and inventory of TS831-4IZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS831-4IZT is usually 5 days.
3.What payment methods are accepted for TS831-4IZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS831-4IZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS831-4IZT?
TS831-4IZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS831-4IZT 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 TS831-4IZT?
For technical support, including TS831-4IZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS831-4IZT requirements.
6.How does Aetrix verify that TS831-4IZT is sourced from the original manufacturer or authorized distributors?
All TS831-4IZT 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 TS831-4IZT meets industry standards.
7.What is the process for return or replacement of TS831-4IZT?
All TS831-4IZT units undergo pre-shipment inspection (PSI). If there is an issue with TS831-4IZT, 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 TS831-4IZT part is unused and in its original packaging.
Return procedure for TS831-4IZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS831-4IZT Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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.
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…
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…
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…
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 …
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…
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…
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…
