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Analog Devices Inc./Maxim Integrated MAX6021AEUR
- Part No.:
- MAX6021AEUR
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6021AEUR.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:1,797
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Product details
Overview
The MAX6021AEUR from Maxim Integrated is a precision, low-dropout, micropower series-mode voltage reference in SOT23-3 packaging, delivering 2.048V ±0.005V output with 0.2% initial accuracy and <15ppm/°C temperature coefficient over –40°C to +85°C. It draws only 27µA quiescent current, supports ±500µA load sourcing/sinking, and maintains stability with up to 2.2nF capacitive load-ideal for high-accuracy ADC/DAC biasing in battery-powered data acquisition systems.
For engineers reviewing the MAX6021AEUR datasheet, MAX6021AEUR pinout, MAX6021AEUR application, or MAX6021AEUR equivalent, this device is selected for ultra-low-power, space-constrained analog signal chains requiring stable 2.048V reference voltage with minimal dropout (100mV at 500µA) and supply-independent current consumption.
Technical Context
This series-mode bandgap reference uses proprietary curvature-correction circuitry and laser-trimmed thin-film resistors to achieve <15ppm/°C tempco and 0.2% initial accuracy. Its internal compensation eliminates need for external capacitor, and supply current varies only 0.8µA/V across input voltage range.
Designed for operation from (VOUT + 0.2V) to 12.6V, it delivers 2.048V output with 100mV dropout at 500µA load, 0.12µV/µA load regulation, and 10µV/V line regulation-enabling reliable performance in low-voltage, wide-input industrial and portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±0.005V (ensures precise 12-bit DAC/ADC full-scale alignment) |
| Initial Accuracy | ±0.2% max (reduces calibration overhead in production test) |
| Tempco | <15ppm/°C (maintains <±0.03% drift over –40°C to +85°C) |
| Quiescent Current | 27µA typical (enables >10-year battery life in 10µA-sleep systems) |
| Dropout Voltage | 100mV at 500µA load (supports operation down to 2.148V input) |
| Load Regulation | 0.12µV/µA (limits output shift to <60µV across full ±500µA range) |
| Capacitive Load Stability | 0–2.2nF (eliminates mandatory output capacitor, saving PCB area) |
Pinout & Package
SOT23-3 package: compact 2.92mm × 1.3mm surface-mount outline with gull-wing leads, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Supply Voltage Input | Accepts (VOUT + 0.2V) to 12.6V; supplies internal bandgap core and output stage |
| 2 (OUT) | Reference Voltage Output | Provides regulated 2.048V; sinks or sources ±500µA while maintaining accuracy |
| 3 (GND) | Ground Reference | Return path for supply and load current; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-corrected bandgap | Enables <15ppm/°C tempco without external trimming components |
| Laser-trimmed thin-film resistors | Guarantees 0.2% initial accuracy without post-package calibration |
| Supply-current independence | 0.8µA/V variation ensures predictable battery drain across input voltage swings |
| No external capacitor required | Internally compensated for 0–2.2nF loads-reduces BOM count and layout complexity |
| Low dropout (100mV @ 500µA) | Permits use with single-cell Li-ion (3.0V min) or two-cell alkaline (2.4V min) supplies |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental sensor node sampling temperature/humidity at 1Hz with 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for ADC VREF pin, enabling full-scale resolution without gain error drift. Use Value: 0.2% initial accuracy and <15ppm/°C tempco eliminate field recalibration; 27µA quiescent current extends 2xAA battery life to >5 years. |
Use Scenario: 4–20mA loop-powered pressure transmitter operating in hazardous zones with ambient temps from –40°C to +85°C. IC Role / Device Role / Timing Role: Supplies precision reference for DAC generating loop current setpoint and for sensor bridge excitation. Use Value: 100mV dropout allows operation from 3.2V loop supply headroom; 130ppm hysteresis ensures repeatability after thermal cycling. |
| Medical Wearable ECG Front-End | Smart Energy Meter ADC Bias |
Use Scenario: Ultra-low-power wearable ECG monitor using 12-bit SAR ADC and coin-cell battery. IC Role / Device Role / Timing Role: Generates clean 2.048V reference for ADC and analog front-end PGA gain-setting resistors. Use Value: 105µVRMS noise (0.1–10Hz) preserves SNR; 2.2nF load stability avoids capacitor placement near sensitive analog traces. |
Use Scenario: DIN-rail mounted electricity meter with polyphase energy measurement IC requiring dual 2.048V references. IC Role / Device Role / Timing Role: Supplies matched reference voltage for metrology ADC and anti-aliasing filter bias network. Use Value: 0.12µV/µA load regulation prevents inter-channel crosstalk; long-term stability of 50ppm/1000hr reduces annual recalibration frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3420ARMZ | 2.048V output, ±0.1% initial accuracy, 3ppm/°C tempco, 12µA quiescent current, SC70-3 package | Lower noise (5.5µVRMS) and tighter tempco-but requires 1µF output capacitor for stability | Select when ultra-low noise and highest tempco performance are critical and board space permits capacitor |
| REF3020AIDBZR | 2.048V output, ±0.2% initial accuracy, 50ppm/°C tempco, 40µA quiescent current, SOT23-3 package | Higher tempco and lower PSRR (70dB vs. 84dB), but qualified to AEC-Q200 for automotive | Select for cost-sensitive automotive body electronics where extended tempco is acceptable |
Compared with ADR3420ARMZ and REF3020AIDBZR, the MAX6021AEUR offers best-in-class balance of ultra-low quiescent current (27µA), capacitor-free stability (0–2.2nF), and industrial-grade tempco (≤15ppm/°C) in standard SOT23-3-making it optimal for space- and power-constrained industrial data acquisition.
Availability
MAX6021AEUR is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, smart energy meters, and battery-powered data loggers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6021AEUR 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, emphasizing low power, high accuracy, and small form factor.
The MAX6021AEUR belongs to the MAX6012 family of micropower series-mode voltage references, engineered specifically for battery-operated and space-constrained systems demanding high initial accuracy, ultra-low quiescent current, and capacitor-free operation.
FAQ
What is the output voltage tolerance of the MAX6021AEUR over temperature?
The MAX6021AEUR guarantees 2.048V output with ±0.005V (±0.2%) initial accuracy at +25°C and maintains ≤±0.03% total error over –40°C to +85°C due to its <15ppm/°C temperature coefficient. This corresponds to a maximum deviation of ±62µV across the full industrial temperature range, verified by the "box method" per datasheet Note 2.
Does the MAX6021AEUR require an external output capacitor?
No, the MAX6021AEUR is internally compensated and stable with capacitive loads from 0 to 2.2nF-no external capacitor is required. Adding one may improve transient response under step-load conditions but is not needed for stability. This eliminates a common BOM item and saves PCB area in space-critical designs.
What is the minimum input voltage required for the MAX6021AEUR to regulate properly?
The MAX6021AEUR requires VIN ≥ (VOUT + 0.2V) = 2.248V to maintain regulation. At 500µA load, dropout is 100mV, so it regulates down to 2.148V-but guaranteed specification starts at 2.248V. Below that, output voltage drops linearly with input, per the absolute minimum input rating in the datasheet.
How does the MAX6021AEUR compare to shunt-mode references in power efficiency?
Unlike shunt-mode references that waste supply current through a series resistor, the MAX6021AEUR draws only 27µA quiescent current independent of load-saving ~80% power in typical 100µA-load scenarios. Its supply current varies just 0.8µA/V, eliminating wasted bias current and maximizing battery life in intermittent-sampling systems.
Is the MAX6021AEUR pin-compatible with other parts in the MAX6012 family?
Yes, all MAX6012/MAX6021/MAX6025/MAX6030/MAX6041/MAX6045/MAX6050 variants share identical SOT23-3 pinout (IN, OUT, GND) and footprint. The MAX6021AEUR can be substituted for any other member of the family on the same PCB-only the output voltage and minor parametric shifts (e.g., noise, tempco) differ between variants.
MAX6021AEUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 500 µA
- Tolerance:
- ±0.24%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 35µVp-p
- Noise - 10Hz to 10kHz:
- 105µVrms
- Voltage - Input:
- 2.5V ~ 12.6V
- Current - Supply:
- 35µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6021AEUR FAQ
1.How can I place an order for MAX6021AEUR through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6021AEUR 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 MAX6021AEUR reliable?
The price and inventory of MAX6021AEUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6021AEUR is usually 5 days.
3.What payment methods are accepted for MAX6021AEUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6021AEUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6021AEUR?
MAX6021AEUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6021AEUR 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 MAX6021AEUR?
For technical support, including MAX6021AEUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6021AEUR requirements.
6.How does Aetrix verify that MAX6021AEUR is sourced from the original manufacturer or authorized distributors?
All MAX6021AEUR 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 MAX6021AEUR meets industry standards.
7.What is the process for return or replacement of MAX6021AEUR?
All MAX6021AEUR units undergo pre-shipment inspection (PSI). If there is an issue with MAX6021AEUR, 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 MAX6021AEUR part is unused and in its original packaging.
Return procedure for MAX6021AEUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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