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Diodes Incorporated ZRC250A02STOB
- Part No.:
- ZRC250A02STOB
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
ZRC250A02STOB.pdf
- Description:
- IC VREF SHUNT 2% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:4,891
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Product details
Overview
ZRC250A02STOB from Diodes Incorporated is a precision 2.5 V bandgap voltage reference IC with ±2% initial tolerance, 30 ppm/°C typical temperature coefficient, and 0.4 Ω typical slope resistance. It operates from 20 µA to 5 mA without external stabilization capacitors and delivers stable output under capacitive loads-ideal for low-power instrumentation and portable battery-powered systems.
For engineers reviewing the ZRC250A02STOB datasheet, ZRC250A02STOB pinout, ZRC250A02STOB application, or ZRC250A02STOB equivalent, key selection criteria include knee current (15 µA typ), transient settling time (<10 µs), TC performance across –40°C to +85°C, and SOT23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The ZRC250A02STOB implements a two-terminal shunt reference topology using a bandgap-derived core, enabling operation as a precision voltage sink with no input supply rail required. Its design eliminates need for external compensation while maintaining stability with load capacitance up to 1 µF.
It functions within a 20 µA–5 mA operating current range, with robust transient immunity (withstands 200 mA surge) and fast dynamic response-reaching regulation in under 10 µs after step-load or line transients-making it suitable for high-accuracy analog front-ends and ADC reference buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±2% at 150 µA, ensuring accurate ADC/DAC biasing in portable instruments |
| Temp Coefficient | 30 ppm/°C typical, limiting full-range drift to ±2.25 mV over –40°C to +85°C |
| Slope Resistance | 0.4 Ω typical, minimizing output voltage shift under varying load current |
| Knee Current | 15 µA typical, enabling reliable start-up and regulation in ultra-low-power sleep modes |
| Transient Settling | <10 µs to 0.1% of final value, supporting fast-sampling data acquisition systems |
| Capacitive Load Stability | Stable with ≥1 µF output capacitance-no external compensation required |
| Max Surge Current | 200 mA short-duration capability, protecting against ESD-induced current spikes |
Pinout & Package
Package: SOT23-3 (TO-236), surface-mount, 1.3 mm × 2.9 mm footprint, 1.1 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference output node | Connected to load and feedback point; sinks current to maintain 2.5 V at this terminal |
| Cathode (Pin 2) | Ground reference / return path | Bias return for internal bandgap circuit; must be low-impedance connection to system ground |
| No-Connect (Pin 3) | Unused terminal | Internally floating or tied to Pin 1 per SOT23-3 variant; not electrically active |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables single-component reference design in size-critical layouts (e.g., wearables, sensor nodes) |
| Low knee current (15 µA typ) | Supports operation down to sub-20 µA bias, extending battery life in always-on monitoring circuits |
| Fast transient response (<10 µs) | Minimizes reference error during multiplexed ADC sampling or burst-mode signal acquisition |
| Stable with capacitive loads | Allows direct connection to ADC input caps or LDO bypass networks without oscillation risk |
| Rugged 200 mA surge rating | Withstands IEC 61000-4-2 ESD events and board-level power sequencing transients |
Applications
| Battery-Powered Portable Meters | Industrial Data Acquisition Modules |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC requiring stable 2.5 V reference across 0–100% battery discharge. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing regulated bias for ADC reference input and analog front-end gain stages. Use Value: Maintains ±0.5 LSB accuracy over temperature and battery voltage drop due to low TC and minimal load regulation error. | Use Scenario: DIN-rail mounted PLC analog input module measuring 4–20 mA loop signals with cold-junction compensation. IC Role / Device Role / Timing Role: Precision voltage reference for thermocouple amplifier offset calibration and ADC reference scaling. Use Value: Enables <±1°C measurement uncertainty over –25°C to +70°C ambient via 30 ppm/°C TC and stable knee behavior. |
| Medical Sensor Signal Conditioning | Automotive Cabin Environment Monitors |
Use Scenario: Wearable pulse oximeter with photodiode TIA and 12-bit delta-sigma ADC operating on coin-cell battery. IC Role / Device Role / Timing Role: Low-current shunt reference supplying bias to op-amp rails and ADC reference pin. Use Value: Achieves 100-hour runtime by drawing only 15 µA minimum current while preserving 0.1% full-scale accuracy. | Use Scenario: HVAC control unit inside vehicle cabin measuring CO₂, humidity, and temperature with microcontroller-based signal chain. IC Role / Device Role / Timing Role: Stable 2.5 V reference for MCU's internal ADC and external sensor interface amplifiers. Use Value: Survives automotive load-dump transients (ISO 7637-2 Pulse 5a) due to 200 mA surge rating and 20 V process technology. |
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 | Adjustable output (2.5 V fixed via resistor network); 20 ppm/°C TC; requires external resistors | Used where programmability or tighter TC is needed; adds BOM cost and layout area | Select when adjustable reference or lower TC outweighs added complexity and component count |
| LM4040C25IDBZR | Fixed 2.5 V; 100 ppm/°C max TC; 65 µA min cathode current; higher knee current | Preferred in cost-sensitive, non-precision applications; less suitable for ultra-low-power designs | Choose for general-purpose use where 100 ppm/°C drift is acceptable and >60 µA bias is available |
Compared with TLVH431AIDBZR and LM4040C25IDBZR, ZRC250A02STOB offers lowest knee current (15 µA vs. ≥65 µA), smallest footprint (SOT23-3), and best balance of TC (30 ppm/°C typ) and transient speed (<10 µs), making it optimal for space- and power-constrained precision analog systems.
Availability
ZRC250A02STOB is available at Aetrix Electronics and suitable for battery-powered portable meters, industrial data acquisition modules, medical sensor signal conditioning, and automotive cabin environment monitors requiring stable component supply and long-term production continuity.
Supply support for ZRC250A02STOB 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 semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and protection applications.
ZRC250A02STOB belongs to the ZRC series of precision shunt voltage references, designed specifically for ultra-low-power, high-stability analog measurement systems in portable and industrial environments.
FAQ
Is ZRC250A02STOB a three-terminal or two-terminal device?
ZRC250A02STOB is functionally a two-terminal shunt voltage reference: Anode (Pin 1) and Cathode (Pin 2) form the active reference path. Pin 3 is internally unused (NC) in the SOT23-3 package and must remain unconnected or tied to Pin 1 per manufacturer guidance-no third terminal participates in regulation.
Can ZRC250A02STOB drive a 1 µF ceramic capacitor directly?
Yes. The ZRC250A02STOB is explicitly characterized for stability with capacitive loads up to 1 µF and does not require an external series resistor or isolation capacitor. This enables direct connection to ADC reference inputs or LDO bypass networks without risk of oscillation or overshoot.
What is the maximum safe operating current for continuous use?
The recommended continuous operating current is 5 mA. While the device withstands transient surges up to 200 mA, sustained current above 5 mA exceeds its thermal limits in the SOT23-3 package (330 mW max at 25°C ambient), risking long-term reliability degradation or parametric shift.
Does ZRC250A02STOB require a minimum load current to regulate properly?
Yes. Regulation begins reliably at 15 µA (knee current), but stable 2.5 V output with specified tolerance and TC is guaranteed only above 20 µA. Below this, output voltage may deviate beyond ±2%, especially at temperature extremes-designs must ensure ≥20 µA minimum cathode current under all operating conditions.
ZRC250A02STOB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 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
ZRC250A02STOB FAQ
1.How can I place an order for ZRC250A02STOB through Aetrix?
Please submit a Request for Quotation (RFQ) for ZRC250A02STOB 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 ZRC250A02STOB reliable?
The price and inventory of ZRC250A02STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC250A02STOB is usually 5 days.
3.What payment methods are accepted for ZRC250A02STOB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC250A02STOB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZRC250A02STOB?
ZRC250A02STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZRC250A02STOB 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 ZRC250A02STOB?
For technical support, including ZRC250A02STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC250A02STOB requirements.
6.How does Aetrix verify that ZRC250A02STOB is sourced from the original manufacturer or authorized distributors?
All ZRC250A02STOB 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 ZRC250A02STOB meets industry standards.
7.What is the process for return or replacement of ZRC250A02STOB?
All ZRC250A02STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZRC250A02STOB, 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 ZRC250A02STOB part is unused and in its original packaging.
Return procedure for ZRC250A02STOB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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