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STMicroelectronics TS821AIZ
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- Part No.:
- TS821AIZ
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
TS821AIZ.pdf
- Description:
- IC VREF SHUNT 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,525
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Product details
Overview
TS821AIZ from STMicroelectronics is a 1.225V micropower shunt voltage reference in SOT23-3 package, delivering ±1% initial accuracy at 25°C, ultra-low 45μA max operating current, and 120ppm/°C tempco over -40°C to +85°C. It serves as a precision voltage reference in battery-operated instrumentation and low-power SMPS feedback loops.
For engineers reviewing the TS821AIZ datasheet, TS821AIZ pinout, TS821AIZ application, or TS821AIZ equivalent, key selection criteria include cathode current range (45μA–12mA), static impedance (0.25–0.5Ω), long-term stability (120ppm @ 1000hrs), and capacitive load stability-critical for portable and space-constrained designs.
Technical Context
The TS821AIZ operates as a two-terminal shunt reference, requiring an external series resistor to set cathode current. Its reverse breakdown voltage is specified at Ik = 100μA and remains stable across 45μA–12mA operating range with <10mV total variation.
It exhibits low dynamic impedance (0.25–0.5Ω) and wideband noise of 200nV/√Hz (10Hz–10kHz), enabling high-accuracy ADC biasing and sensor excitation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal; ±1% tolerance at 25°C ensures precise ADC reference or DAC bias without trimming. |
| Operating Current | 45μA max at 25°C; enables operation from microamp-level supplies in energy-harvesting systems. |
| Tempco | 120ppm/°C max; maintains ≤±1.2mV drift over full -40°C to +85°C range for industrial-grade stability. |
| Static Impedance | 0.25–0.5Ω; minimizes output voltage shift under varying load current, critical for closed-loop regulation. |
| Noise (10Hz–10kHz) | 200nV/√Hz; supports high-resolution (≥16-bit) analog measurement without added filtering. |
| Long-Term Stability | 120ppm after 1000hrs; reduces calibration frequency in field-deployed test equipment. |
Pinout & Package
SOT23-3L plastic micropackage (3.04mm × 2.64mm × 1.02mm), lead-free ECOPACK® compliant, rated for 260°C soldering (10s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode | Reference output node | Connected to system ground via external resistor; sets operating point and sinks cathode current. |
| Anode | Ground reference terminal | Direct connection to system ground; forms two-terminal shunt configuration with cathode. |
| NC | No connect | Internally unconnected; must remain floating per datasheet-no PCB trace or thermal pad tie. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 45μA max enables direct use in coin-cell-powered devices with multi-year battery life. |
| Capacitive load stability | Stable with up to 100µF output capacitance-eliminates need for isolation resistors in SMPS feedback networks. |
| High precision grade (A) | ±1% initial tolerance at 25°C reduces post-manufacturing calibration effort in portable medical monitors. |
| Robust ESD rating | 2kV HBM protection allows safe handling on standard assembly lines without special ESD controls. |
Applications
| Battery-Powered Multimeter | Isolated DC-DC Converter Feedback |
|---|---|
Use Scenario: Portable handheld multimeter requiring stable 1.225V reference for 16-bit SAR ADC scaling. IC Role / Device Role / Timing Role: Shunt voltage reference providing ratiometric accuracy against internal ADC reference. Use Value: ±1% initial tolerance and 120ppm/°C tempco ensure <0.02% full-scale error across operating temperature range. | Use Scenario: Secondary-side feedback path in isolated flyback converter powering IoT sensor nodes. IC Role / Device Role / Timing Role: Precision shunt reference driving optocoupler LED to regulate primary-side controller. Use Value: 45μA operating current minimizes standby power loss; capacitive load stability simplifies compensation design. |
| Portable Gas Detector Signal Chain | Low-Power Data Acquisition Module |
Use Scenario: Electrochemical gas sensor interface where reference voltage biases transimpedance amplifier. IC Role / Device Role / Timing Role: Low-noise (200nV/√Hz), low-drift reference for analog front-end conditioning. Use Value: 200nV/√Hz noise floor preserves signal integrity for sub-ppm gas concentration resolution. | Use Scenario: Remote environmental monitoring node using 12-bit delta-sigma ADC for temperature/humidity sensing. IC Role / Device Role / Timing Role: Primary voltage reference for ADC and internal LDO regulator feedback. Use Value: 0.25–0.5Ω static impedance prevents reference droop during burst-mode sampling events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBVR | 2.5V adjustable reference; requires external resistors to set 1.225V; 80μA typical IQ | Higher minimum cathode current (100μA) limits ultra-low-power use cases | Choose when adjustable output or higher voltage is needed; avoid if strict 1.225V and <50μA current required. |
| MAX6008AEUR+T | 1.25V output; ±0.5% initial accuracy; 35μA max IQ; SOT23-3 | 0.025V higher nominal voltage shifts ADC full-scale mapping | Choose for tighter initial tolerance and lower IQ; recalculate gain/offset in analog signal chain. |
Compared with TLVH431AIDBVR and MAX6008AEUR+T, TS821AIZ uniquely delivers exact 1.225V output with ±1% tolerance and guaranteed 45μA max operating current-making it optimal for legacy designs and fixed-voltage, microamp-biased systems where resistor network overhead or voltage offset is unacceptable.
Availability
TS821AIZ is available at Aetrix Electronics and suitable for battery chargers, portable instrumentation, and switch-mode power supply feedback circuits requiring stable component supply and long-lifecycle support.
Supply support for TS821AIZ 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, designing and manufacturing analog, MCU, power, and MEMS products for industrial, automotive, and consumer markets.
The TS821 series belongs to ST's precision analog reference portfolio, engineered specifically for space-constrained, low-power applications demanding stable 1.225V references with minimal operating current and robust capacitive load immunity.
FAQ
What is the minimum cathode current required for TS821AIZ to maintain regulation?
The TS821AIZ requires a minimum cathode current of 45μA at 25°C and 50μA across the full -40°C to +85°C range to guarantee regulation within specifications. Below this threshold, output voltage deviates beyond ±1% tolerance and tempco performance degrades.
Can TS821AIZ drive a 100µF capacitor directly without oscillation?
Yes-the TS821AIZ is explicitly characterized for stability with up to 100µF capacitive loads, as confirmed in Figure 4 of the datasheet. No series isolation resistor is needed, simplifying layout in SMPS feedback paths and reducing component count.
How does the 120ppm/°C temperature coefficient translate to voltage drift over temperature?
With a 1.225V nominal output and 120ppm/°C tempco, the maximum drift over -40°C to +85°C (125°C span) is 150ppm × 1.225V = ±0.184mV. This yields a total output range of 1.2248V to 1.2252V at 25°C ±1%, staying well within ±2mV absolute window.
Is TS821AIZ RoHS-compliant and lead-free?
Yes-TS821AIZ is supplied in an ECOPACK®-compliant SOT23-3L package with lead-free second-level interconnect, meeting RoHS Directive 2011/65/EU and JEDEC JESD97 standards. The inner box label and package marking confirm lead-free status and moisture sensitivity level (MSL3).
TS821AIZ 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:
- ±1%
- 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
TS821AIZ FAQ
1.How can I place an order for TS821AIZ through Aetrix?
Please submit a Request for Quotation (RFQ) for TS821AIZ 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 TS821AIZ reliable?
The price and inventory of TS821AIZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS821AIZ is usually 5 days.
3.What payment methods are accepted for TS821AIZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS821AIZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS821AIZ?
TS821AIZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS821AIZ 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 TS821AIZ?
For technical support, including TS821AIZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS821AIZ requirements.
6.How does Aetrix verify that TS821AIZ is sourced from the original manufacturer or authorized distributors?
All TS821AIZ 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 TS821AIZ meets industry standards.
7.What is the process for return or replacement of TS821AIZ?
All TS821AIZ units undergo pre-shipment inspection (PSI). If there is an issue with TS821AIZ, 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 TS821AIZ part is unused and in its original packaging.
Return procedure for TS821AIZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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