My Inquiry
My Account
STMicroelectronics TS821IZ
,TO-226_straightlead.jpg)
- Part No.:
- TS821IZ
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
TS821IZ.pdf
- Description:
- IC VREF SHUNT 2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,061
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TS821IZ from STMicroelectronics is a 1.225V micropower shunt voltage reference in SOT23-3 package, delivering ±2% initial accuracy at 25°C, 120ppm/°C tempco, and ultra-low 45μA max operating current. It serves as a precision voltage reference in battery-operated equipment, SMPS feedback loops, and instrumentation signal conditioning circuits.
For engineers reviewing the TS821IZ datasheet, TS821IZ pinout, TS821IZ application, or TS821IZ equivalent, key selection criteria include cathode current range (45μA–12mA), static impedance (0.25–0.5Ω), long-term stability (120ppm over 1000hrs), and capacitive load stability up to 100µF.
Technical Context
The TS821IZ operates as a two-terminal shunt reference, requiring an external series resistor to set cathode current. Its reverse breakdown voltage is specified at 100μA test current and remains stable across -40°C to +85°C with ≤120ppm/°C average temperature coefficient.
It exhibits low dynamic impedance (0.25–0.5Ω) and wideband noise of 200nV/√Hz (10Hz–10kHz), enabling high-accuracy analog measurement and regulation where low power and space constraints are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V typical; tight tolerance variants available (±2%/±1%/±0.5%) for calibration-critical designs |
| Operating Current | 45μA max at 25°C; supports ultra-low-power operation in energy-constrained systems |
| Tempco | 120ppm/°C max; ensures <±3.7mV drift over full -40°C to +85°C industrial range |
| Static Impedance | 0.25–0.5Ω; minimizes output voltage shift under varying load or supply conditions |
| Noise Density | 200nV/√Hz (10Hz–10kHz); suitable for high-resolution ADC references and precision sensor interfaces |
| Long-Term Stability | 120ppm over 1000 hours; enables reliable performance in field-deployed instrumentation |
Pinout & Package
SOT23-3L plastic micropackage (JEDEC TO-236AB), 2.9mm × 2.64mm footprint, 0.95mm pitch, lead-free ECOPACK® compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground terminal | Connected to system GND; defines reference potential for cathode voltage |
| Cathode (Pin 2) | Output voltage node | Delivers regulated 1.225V when biased with external resistor; sinks current into load |
| No Connect (Pin 3) | Unused terminal | Internally unconnected; must be left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 45μA max enables >10-year battery life in coin-cell-powered sensors and meters |
| Capacitive load stability | Stable with up to 100µF output capacitance-eliminates need for isolation resistors in SMPS feedback |
| Industrial temperature range | -40°C to +85°C operation supports deployment in harsh environments without derating |
| Low dynamic impedance | 0.25–0.5Ω reduces output error due to cathode current variation in closed-loop regulators |
Applications
| Battery-Powered Instrumentation | Switch-Mode Power Supply Feedback |
|---|---|
Use Scenario: Portable multimeter using 16-bit SAR ADC for voltage measurement. IC Role / Device Role / Timing Role: Provides stable 1.225V reference for ADC internal gain scaling and offset calibration. Use Value: Enables ±0.02% full-scale accuracy over temperature and battery discharge cycle. | Use Scenario: 12V-to-3.3V buck converter with optocoupler-isolated feedback. IC Role / Device Role / Timing Role: Shunt reference on secondary side sets precise 3.3V output via TL431-like control loop. Use Value: Achieves ±1% output regulation without trimming, even with 100µF bulk capacitor on reference node. |
| Computer Peripheral Voltage Monitoring | Low-Power Sensor Signal Conditioning |
Use Scenario: USB-powered thermal camera module monitoring 1.8V core rail. IC Role / Device Role / Timing Role: Supplies reference to comparator-based undervoltage lockout circuit. Use Value: Triggers shutdown at 1.78V ±10mV with <1μA standby current draw. | Use Scenario: Wireless gas sensor node with analog front-end amplifying 200mV full-scale NDIR signal. IC Role / Device Role / Timing Role: Reference for programmable gain amplifier and 12-bit delta-sigma ADC. Use Value: Maintains <0.1% gain error across 0–50°C ambient, supporting ppm-level gas concentration resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBZR | 2.5V fixed reference; higher 80μA min cathode current; 100ppm/°C tempco | Requires resistor divider for 1.225V use; less suitable for sub-100μA systems | Choose when 2.5V reference suffices and tighter tempco is prioritized over current budget |
| LM4040CIM3-ADJ | Adjustable output (1.235V–10V); 75μA max quiescent; 100ppm/°C tempco | Needs external resistors; introduces additional error sources in precision 1.225V setups | Prefer only when design requires programmability and can tolerate added component count and tolerance stack-up |
Compared with TLVH431AIDBZR and LM4040CIM3-ADJ, the TS821IZ delivers exact 1.225V output with lowest operating current (45μA), making it optimal for fixed-voltage, ultra-low-power applications where board space and battery life are constrained.
Availability
TS821IZ is available at Aetrix Electronics and suitable for battery-operated equipment, switch mode power supplies, and instrumentation requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for TS821IZ 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The TS821IZ belongs to ST's precision analog reference product line, engineered specifically for space- and power-constrained applications demanding stable, low-drift voltage references across industrial temperature ranges.
FAQ
What is the minimum cathode current required for TS821IZ to regulate within specification?
The TS821IZ requires a minimum cathode current of 45μA at 25°C and 50μA across the full -40°C to +85°C range to maintain output voltage accuracy and tempco compliance. Operation below this threshold may cause output voltage deviation exceeding ±2% and increased temperature sensitivity.
Can TS821IZ drive a 100µF capacitor directly without oscillation?
Yes - the TS821IZ 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 SMPS feedback network design and improving transient response in power regulation circuits.
How does the 120ppm/°C temperature coefficient translate to actual voltage drift?
At 1.225V nominal output, a 120ppm/°C tempco results in maximum drift of ±(1.225V × 120 × 10⁻⁶ × 60°C) = ±8.82mV over the full -40°C to +85°C range, corresponding to ±0.72% of full scale - well within its ±2% initial tolerance band.
Is TS821IZ RoHS-compliant and lead-free?
Yes - the TS821IZ is supplied in an ECOPACK®-compliant SOT23-3L package with lead-free second-level interconnect, meeting RoHS Directive 2011/65/EU and JEDEC JESD97 marking requirements. The inner box label and device marking confirm lead-free status and environmental compliance.
TS821IZ 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:
- ±2%
- 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
TS821IZ FAQ
1.How can I place an order for TS821IZ through Aetrix?
Please submit a Request for Quotation (RFQ) for TS821IZ 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 TS821IZ reliable?
The price and inventory of TS821IZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS821IZ is usually 5 days.
3.What payment methods are accepted for TS821IZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS821IZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS821IZ?
TS821IZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS821IZ 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 TS821IZ?
For technical support, including TS821IZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS821IZ requirements.
6.How does Aetrix verify that TS821IZ is sourced from the original manufacturer or authorized distributors?
All TS821IZ 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 TS821IZ meets industry standards.
7.What is the process for return or replacement of TS821IZ?
All TS821IZ units undergo pre-shipment inspection (PSI). If there is an issue with TS821IZ, 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 TS821IZ part is unused and in its original packaging.
Return procedure for TS821IZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS821IZ Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
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…
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…
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…
