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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

STMicroelectronics TS821BIZ

Name: TS821BIZ
Brand: STMicroelectronics
SKU: TS821BIZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS821BIZ

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

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

Datasheet:: TS821BIZ.pdf

Description:: IC VREF SHUNT 0.5% TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,509

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Product details

Overview

TS821BIZ from STMicroelectronics is a 1.225V micropower shunt voltage reference in SOT23-3 package, rated for ±0.5% initial accuracy at 25°C, 120ppm/°C tempco, and 45μA max operating current. It delivers stable reference voltage for precision analog circuits in battery-operated instrumentation and SMPS feedback loops.

For engineers reviewing the TS821BIZ datasheet, TS821BIZ pinout, TS821BIZ application, or TS821BIZ equivalent, key selection criteria include ultra-low quiescent current, tight initial tolerance, capacitive-load stability, and industrial temperature range (-40°C to +85°C) performance.

Technical Context

The TS821BIZ operates as a two-terminal shunt reference, requiring an external series resistor to set cathode current between 45μA and 12mA. Its 1.225V output is derived from a bandgap-based core optimized for low-power operation and minimal voltage drift across load and temperature.

It exhibits 0.25–0.5Ω static impedance (ΔIk = 45μA to 1mA), 200nV/√Hz wideband noise (10Hz–10kHz), and maintains stability with up to 100µF capacitive loads-enabling direct use in noisy power supply monitoring and high-precision ADC biasing without added buffering.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.225V typical; ±0.5% tolerance at 25°C ensures <6.1mV absolute error in precision feedback paths.
Operating Current	45μA maximum at 25°C; enables operation from microamp-level bias sources in energy-harvesting systems.
Tempco	120ppm/°C max; contributes ≤1.2mV drift over -40°C to +85°C, critical for uncalibrated field instruments.
Static Impedance	0.25–0.5Ω; minimizes load-induced voltage shift in dynamic current-sink applications like DAC references.
Noise Density	200nV/√Hz (10Hz–10kHz); supports sub-16-bit ADC accuracy without additional filtering.
Long-Term Stability	120ppm over 1000 hours; reduces calibration frequency in deployed test equipment.

Pinout & Package

SOT23-3L plastic micropackage (JEDEC MO-178AA), 2.9mm × 2.64mm footprint, 0.95mm pitch, lead-free ECOPACK® compliant.

Pin/Terminal	Circuit Role	Design Meaning
Cathode	Current sink input	Accepts regulated current from external resistor; voltage develops across device when Ik ≥ 45μA.
Anode	Reference ground return	Common node for reference output; must be low-impedance to avoid ground bounce errors.
NC	No connection	Internally unconnected; electrically isolated and must remain floating per datasheet.

Key Features

Feature	Design Value
Ultra-low operating current	45μA max enables >10-year battery life in coin-cell-powered data loggers.
Capacitive-load stability	Stable with 0–100µF output capacitance, eliminating need for isolation resistors in SMPS feedback networks.
Industrial temperature range	-40°C to +85°C operation supports deployment in outdoor metering and factory-floor sensors.
Low static impedance	0.25Ω min ensures <1mV output shift under 4mA load transients in precision current sources.

Applications

Battery Charger Feedback

Portable Instrument Reference

Use Scenario: Precision voltage sensing in Li-ion charger IC feedback loop to regulate charge termination voltage within ±5mV.

IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225V基准 for op-amp comparator input in constant-voltage stage.

Use Value: ±0.5% initial accuracy and 120ppm/°C tempco ensure charge voltage remains within JEITA spec across ambient temperature swings.

Use Scenario: Reference source for 16-bit SAR ADC in handheld multimeter measuring mV-range signals.

IC Role / Device Role / Timing Role: Low-noise (200nV/√Hz), low-drift voltage reference replacing larger, higher-current alternatives.

Use Value: 45μA operating current extends alkaline battery life to >200 hours while maintaining <0.01% measurement linearity.

SMPS Output Monitoring

Industrial Sensor Signal Conditioning

Use Scenario: Secondary-side voltage reference in isolated flyback converter for telecom power module (3.3V/5V output).

IC Role / Device Role / Timing Role: Cathode-connected to optocoupler LED anode; regulates feedback current proportional to output voltage.

Use Value: 0.5Ω static impedance minimizes regulation error during load-step events; stable with 47µF ceramic output cap.

Use Scenario: Excitation reference for 350Ω strain gauge bridge in load cell interface circuit.

IC Role / Device Role / Timing Role: Low-drift, low-noise shunt reference supplying bridge excitation and ADC reference simultaneously.

Use Value: Matched tempco and long-term stability (<120ppm/1000hrs) eliminate differential drift between excitation and reference paths.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431BIDBVR	2.5V fixed output; 80ppm/°C tempco; 80μA typical IQ; adjustable via resistor divider.	Requires external resistors to scale to 1.225V; higher IQ limits ultra-low-power use.	Select when system already uses 2.5V references and needs programmability.
MAX6008BEUR+T	1.25V output; ±0.2% initial accuracy; 75ppm/°C tempco; 35μA max IQ; SC70-3 package.	Higher accuracy but tighter tempco not needed for most industrial apps; SC70 slightly smaller than SOT23-3.	Select when sub-0.2% tolerance is mandatory and board space allows SC70 footprint.

Compared with TLVH431BIDBVR and MAX6008BEUR+T, the TS821BIZ offers the lowest operating current (45μA max) and native 1.225V output-reducing component count and power loss in space-constrained, battery-critical designs where exact 1.225V is required.

Availability

TS821BIZ is available at Aetrix Electronics and suitable for battery chargers, portable instrumentation, switch-mode power supplies, and battery-operated equipment requiring stable component supply across extended temperature ranges.

Supply support for TS821BIZ 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The TS821 belongs to ST's precision analog reference product line, engineered specifically for ultra-low-power, high-stability shunt reference applications in space- and energy-constrained systems.

FAQ

What is the minimum cathode current required for regulation?

The TS821BIZ requires a minimum cathode current of 45μA at 25°C to maintain regulation. At full temperature range (-40°C to +85°C), the minimum increases to 50μA. Below this threshold, the output voltage drops below specification and cannot be guaranteed.

Can TS821BIZ drive a 10µF ceramic capacitor directly?

Yes-the TS821BIZ is explicitly characterized for stability with capacitive loads up to 100µF, including ceramic types. No series isolation resistor is needed, unlike many older shunt references, simplifying layout in SMPS feedback networks.

How does the 0.5% grade differ from the 1% and 2% versions?

The TS821BIZ (0.5%) has tighter initial tolerance (±0.5% vs ±1% for A-grade or ±2% for standard), narrower voltage spread (1.219–1.231V vs 1.213–1.237V or 1.200–1.250V), and lower temperature-induced error bands (±6mV vs ±12mV or ±25mV over -40°C to +85°C).

Is the NC pin on TS821BIZ internally connected?

No-the third pin (labeled NC in the SOT23-3 top view) is internally unconnected and must remain electrically floating. Connecting it to any potential-even ground-violates the datasheet and may cause unpredictable behavior or damage.

TS821BIZ Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

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

Series:: -

Packaging:: Bulk

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 1.225V

Voltage - Output (Max):: -

Current - Output:: 12 mA

Tolerance:: ±0.5%

Temperature Coefficient:: 120ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: -

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 50 µA

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

TS821BIZ FAQ

1.How can I place an order for TS821BIZ through Aetrix?

Please submit a Request for Quotation (RFQ) for TS821BIZ 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 TS821BIZ reliable?

The price and inventory of TS821BIZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS821BIZ is usually 5 days.

3.What payment methods are accepted for TS821BIZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS821BIZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS821BIZ?

TS821BIZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS821BIZ 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 TS821BIZ?

For technical support, including TS821BIZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS821BIZ requirements.

6.How does Aetrix verify that TS821BIZ is sourced from the original manufacturer or authorized distributors?

All TS821BIZ 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 TS821BIZ meets industry standards.

7.What is the process for return or replacement of TS821BIZ?

All TS821BIZ units undergo pre-shipment inspection (PSI). If there is an issue with TS821BIZ, 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 TS821BIZ part is unused and in its original packaging.

Return procedure for TS821BIZ:

1.Submit a request within 90 days.

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

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