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Diodes Incorporated ZR285R02STZ
- Part No.:
- ZR285R02STZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
ZR285R02STZ.pdf
- Description:
- IC VREF SHUNT 2% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:4,767
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Product details
Overview
ZR285R02STZ from Diodes Incorporated is a precision 2.5 V micropower voltage reference IC using bandgap circuit design, with ±2% initial tolerance, 30 ppm/°C typical temperature coefficient, and stable operation from 20 µA to 20 mA supply current - deployed in battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the ZR285R02STZ datasheet, ZR285R02STZ pinout, ZR285R02STZ application, or ZR285R02STZ equivalent, key selection criteria include low knee current (15 µA typ), slope resistance (0.4 Ω typ), wide operating current range (20 µA–20 mA), capacitive load stability without external compensation, and SOT23-3 package compatibility for space-constrained PCB layouts.
Technical Context
The ZR285R02STZ operates as a two-terminal shunt voltage reference, sinking current to maintain a precise 2.5 V reverse breakdown voltage across its cathode-anode terminals. Its bandgap-based architecture delivers stable output independent of supply variations and eliminates need for external stabilization capacitors.
It exhibits low dynamic impedance (0.3–0.8 Ω at 100 Hz), wideband noise of 60 µV(rms) (10 Hz–10 kHz), and maintains regulation under capacitive loads - enabling direct use in precision ADC biasing, DAC reference, and low-power sensor excitation circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V ±2% - ensures accurate scaling for 12-bit+ ADCs and precision analog front-ends |
| Tempco (TC) | 30 ppm/°C typ - limits drift to ≤±1.2 mV over –40°C to +85°C industrial range |
| Min Operating Current | 13 µA typ - enables ultra-low-power sleep-mode reference retention in portable devices |
| Slope Resistance | 0.4 Ω typ - minimizes output voltage shift under load transients (e.g., SAR ADC sampling bursts) |
| Dynamic Impedance | 0.3 Ω @ 100 Hz - supports fast settling and low-noise performance in closed-loop references |
| Wideband Noise | 60 µV(rms), 10 Hz–10 kHz - suitable for high-resolution measurement systems requiring <1 LSB noise floor |
| Capacitive Load Stability | Stable with any capacitive load - removes need for series resistor or external capacitor in layout |
Pinout & Package
Package: SOT23-3 (JEDEC TO-236AB), 2.80 × 2.10 × 1.12 mm body, gull-wing leads, 0.95 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (output) | Connected to regulated 2.5 V node; sinks current from load to ground via Pin 2 |
| Pin 2 | Anode (ground) | System ground reference; all internal bias and regulation referenced to this terminal |
| Pin 3 | No-connect / floating | Internally unconnected; must be left open or tied to Pin 2 per datasheet recommendation |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables single-component reference implementation in space-limited designs (e.g., wearables, handheld meters) |
| Low knee current (15 µA typ) | Permits operation below 20 µA - critical for coin-cell-powered devices with multi-year battery life targets |
| Stable with capacitive loads | Eliminates risk of oscillation when driving ADC input caps or long PCB traces without damping networks |
| Rugged transient rating (200 mA surge) | Withstands ESD events and inrush currents during power-up sequencing without latch-up or degradation |
| Fast turn-on (<5 µs) | Supports duty-cycled reference activation in low-power microcontroller systems to minimize quiescent energy |
Applications
| Portable Multimeter Reference | Precision Data Logger Bias |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 16-bit delta-sigma ADC conversion across battery discharge cycle. IC Role / Device Role / Timing Role: Shunt voltage reference providing ratiometric accuracy for analog input scaling and offset calibration. Use Value: ±2% tolerance and 30 ppm/°C TC ensure <0.05% full-scale error over –10°C to +50°C operating range without recalibration. | Use Scenario: Battery-operated environmental data logger sampling temperature/humidity sensors every 10 seconds with 12-bit resolution. IC Role / Device Role / Timing Role: Low-quiescent-current reference source enabling >5-year coin-cell operation while maintaining ADC linearity. Use Value: 13 µA min operating current allows reference to remain active during sleep, eliminating wake-up delay and startup drift. |
| Industrial Sensor Transmitter | Calibration Equipment Reference |
Use Scenario: 4–20 mA loop-powered pressure transmitter where reference stability directly impacts current output accuracy. IC Role / Device Role / Timing Role: Precision shunt reference establishing excitation voltage for bridge sensors and ADC reference for digitization. Use Value: 0.4 Ω slope resistance ensures <10 µV output shift under 1 mA load variation - meeting ±0.1% loop accuracy spec. | Use Scenario: Benchtop calibration source verifying voltage standards in metrology labs with traceable 2.5 V output. IC Role / Device Role / Timing Role: Primary reference element in programmable calibrator's analog output stage. Use Value: 60 µV(rms) wideband noise and <0.8 Ω dynamic impedance support sub-LSB repeatability in 20-bit measurement setups. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable (2.5 V set via resistors), higher 80 ppm/°C TC, 0.2 Ω typical slope resistance | Requires two external resistors; less accurate at fixed 2.5 V due to resistor tolerance stack-up | Preferred when design requires adjustable reference or tighter slope resistance, but adds BOM and layout complexity |
| LM4040C25IDBZR | Fixed 2.5 V, ±0.5% initial tolerance, 50 ppm/°C TC, 0.5 Ω slope resistance, 65 µV(rms) noise | Higher accuracy grade; tighter tolerance suits metrology-grade instruments where ZR285R02STZ's ±2% is insufficient | Select when absolute initial accuracy >0.5% is mandatory and cost premium is acceptable |
Compared with TLVH431ACDBVR and LM4040C25IDBZR, the ZR285R02STZ offers lowest system-level cost for fixed 2.5 V applications needing ±2% tolerance and industrial temp range, with minimal footprint and zero external components - ideal for high-volume portable instrumentation.
Availability
ZR285R02STZ is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, industrial 4–20 mA transmitters, and calibration equipment requiring stable component supply with consistent parametric performance across production lots.
Supply support for ZR285R02STZ 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, cost-optimized components for industrial, computing, and consumer markets.
The ZR285 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, space-constrained applications demanding stable 2.5 V reference without external compensation components.
FAQ
What is the maximum capacitive load the ZR285R02STZ can drive without oscillation?
The ZR285R02STZ is explicitly characterized as stable with any capacitive load - no upper limit is specified in the datasheet. This eliminates need for series damping resistors or external compensation capacitors, unlike many shunt references that require careful load capacitance management to avoid instability.
Can ZR285R02STZ operate reliably below 20 µA?
Yes - the device has a typical minimum operating current of 13 µA and guaranteed operation down to 13 µA (min). It maintains regulation at currents as low as 15 µA, making it suitable for ultra-low-power modes where reference current must be minimized to extend battery life.
Is Pin 3 required to be connected, and if so, how?
No - Pin 3 is internally unconnected. The datasheet states it may be left floating or tied to Pin 2 (anode/ground). Neither configuration affects electrical performance; tying to ground simplifies layout and avoids potential floating-node noise coupling in sensitive analog sections.
How does the ZR285R02STZ handle transient overcurrent events?
The device is rated for transient currents up to 200 mA and features rugged 20 V process technology. It withstands short-duration surges without damage or parameter shift, supporting robustness in environments with ESD, inductive kickback, or power-rail fault conditions - verified per absolute maximum ratings in DS32168 Rev. 8-2.
ZR285R02STZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 90ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
ZR285R02STZ FAQ
1.How can I place an order for ZR285R02STZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZR285R02STZ 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 ZR285R02STZ reliable?
The price and inventory of ZR285R02STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR285R02STZ is usually 5 days.
3.What payment methods are accepted for ZR285R02STZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR285R02STZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZR285R02STZ?
ZR285R02STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZR285R02STZ 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 ZR285R02STZ?
For technical support, including ZR285R02STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR285R02STZ requirements.
6.How does Aetrix verify that ZR285R02STZ is sourced from the original manufacturer or authorized distributors?
All ZR285R02STZ 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 ZR285R02STZ meets industry standards.
7.What is the process for return or replacement of ZR285R02STZ?
All ZR285R02STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZR285R02STZ, 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 ZR285R02STZ part is unused and in its original packaging.
Return procedure for ZR285R02STZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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