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Analog Devices Inc./Maxim Integrated MAX6018BEUR21
- Part No.:
- MAX6018BEUR21
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6018BEUR21.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:1,360
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Product details
Overview
MAX6018BEUR21 from Maxim Integrated is a precision, low-dropout, micropower bandgap voltage reference in a 3-pin SOT23 package, delivering a stable 2.048V output with ±0.4% initial accuracy and 50ppm/°C max temperature drift. It operates from (VOUT + 200mV) = 2.25V to 5.5V input, consumes ≤6µA supply current, supports ±1mA load current, and enables accurate ADC/DAC biasing in ultra-low-power battery systems.
For engineers reviewing the MAX6018BEUR21 datasheet, MAX6018BEUR21 pinout, MAX6018BEUR21 application, or MAX6018BEUR21 equivalent, this page provides verified electrical parameters, SOT23 terminal roles, real-world use cases in battery monitoring and data acquisition, and validated alternative options for design flexibility and supply continuity.
Technical Context
The MAX6018BEUR21 is a three-terminal series voltage reference using BiCMOS bandgap architecture, optimized for operation at minimal headroom: dropout voltage is guaranteed ≤200mV at 1mA source current. Its supply current remains highly stable-varying only 0.1µA/V across input voltage-enabling predictable power budgeting in energy-constrained systems.
It features internal compensation for capacitive loads from 100pF to 1µF, achieves 0.1% settling in 200µs with 5nF output capacitance, and maintains stability under line/load transients typical of two-cell alkaline or Li-ion battery discharge profiles. Ripple rejection exceeds 85dB at 120Hz, supporting clean reference performance in noisy supply environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±0.4% (max initial error at +25°C; enables precise 12-bit ADC full-scale calibration) |
| Supply Current | ≤6µA (max over -40°C to +85°C; allows >10-year battery life in 10µA-systems) |
| Dropout Voltage | ≤200mV at 1mA load (supports regulation down to 2.25V input; compatible with end-of-life 2×AA/AAA) |
| Temp Drift | ≤50ppm/°C (max; contributes <±0.1% output error over full industrial range) |
| Line Regulation | ≤330µV/V (from 2.25V to 5.5V; ensures <0.07% output shift across battery discharge) |
| Load Regulation | ≤1000µV/mA (0–1mA sourcing; holds reference within 1LSB for 12-bit 2.048V DACs) |
| Noise (10Hz–10kHz) | 175µVRMS (low enough to avoid degrading ENOB in 14-bit SAR ADCs) |
Pinout & Package
MAX6018BEUR21 uses a 3-pin SOT23 package (JEDEC MO-178AA), with 1.3mm × 0.8mm footprint and 1.0mm height-optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Supply voltage input | Accepts 2.25V–5.5V; requires 0.1µF bypass capacitor to GND for PSRR and transient immunity |
| 2 (OUT) | Reference voltage output | Delivers regulated 2.048V; must be bypassed with ≥100pF to ground for stability; drives up to 1mA |
| 3 (GND) | Analog ground reference | Return path for IN and OUT; must connect to clean analog ground plane to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | ≤6µA max across temperature-enables multi-year operation on coin cells without compromising accuracy |
| Low dropout operation | 200mV max at 1mA-allows direct regulation from aging 2-cell alkaline (down to 2.25V) or single LiFePO₄ |
| Supply-voltage-independent IIN | 0.1µA/V variation-eliminates need for dynamic current budgeting during battery voltage decay |
| Capacitive-load stability | Stable with 100pF–1µF output capacitance-simplifies layout; no external compensation required |
| Fast turn-on settling | 200µs to 0.1% with 5nF COUT-supports duty-cycled reference enable in low-power sensor nodes |
Applications
| Battery Voltage Monitoring | Portable Data Acquisition |
|---|---|
|
Use Scenario: Real-time measurement of two-cell alkaline battery voltage during deep discharge (2.25V–3.2V). IC Role / Device Role / Timing Role: Provides stable 2.048V reference for 12-bit ADC converting battery voltage via resistor divider. Use Value: Enables accurate state-of-charge estimation down to end-of-life voltage while consuming <6µA-extending usable battery life by >25% vs. higher-current references. |
Use Scenario: Handheld multimeter sampling analog signals with 14-bit SAR ADC. IC Role / Device Role / Timing Role: Supplies low-noise, low-drift reference to ADC front-end; enabled only during conversion window. Use Value: 175µVRMS noise and 50ppm/°C drift preserve effective resolution >13.5 bits across 0–50°C operating range. |
| Industrial Sensor Transmitters | Medical Wearable Signal Chain |
|
Use Scenario: 4–20mA loop-powered temperature transmitter operating from 12V supply with local sensing. IC Role / Device Role / Timing Role: References precision current-sense amplifier and DAC generating loop current. Use Value: 0.4% initial accuracy and 330µV/V line regulation ensure <0.1% total loop error across supply variations and ambient temperature shifts. |
Use Scenario: ECG front-end in disposable patch monitor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Sets bias point for instrumentation amplifier and reference for 12-bit ADC digitizing analog leads. Use Value: 6µA quiescent current minimizes drain on 225mAh battery; 200mV dropout permits operation until battery reaches 2.25V-maximizing clinical wear time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6012BEUR21-T | Same 2.048V output, ±0.4% accuracy, but higher 10µA max supply current and 350ppm/°C drift. | Limited to less demanding applications where long-term stability and ultra-low power are not critical. | Select when cost is prioritized over power efficiency and thermal performance; not suitable for battery life >5 years. |
| REF3020AIDBZR | 2.048V output, ±0.2% initial accuracy, 50ppm/°C drift, but 50µA supply current and larger SOT23-5 package. | Requires PCB redesign due to extra pins (EN, NC); higher current limits use in always-on systems only. | Choose if tighter initial accuracy is mandatory and board space/power budget allow 8× higher current draw. |
Compared with MAX6018BEUR21, MAX6012BEUR21-T trades 4µA lower quiescent current and 300ppm/°C worse drift for lower cost, while REF3020AIDBZR delivers superior initial accuracy at the expense of 8× higher supply current and incompatible pinout-making MAX6018BEUR21 optimal for space- and energy-constrained battery systems requiring balanced precision and micropower operation.
Availability
MAX6018BEUR21 is available at Aetrix Electronics and suitable for battery voltage monitoring, portable data acquisition, industrial sensor transmitters, medical wearable signal chains, and low-power IoT edge nodes requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6018BEUR21 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 high-performance analog and mixed-signal ICs for power, sensing, interface, and timing applications in industrial, medical, and consumer systems.
The MAX6018 family was engineered specifically for ultra-low-power, precision voltage referencing in battery-operated equipment-emphasizing micropower consumption, minimal dropout, and SOT23 compactness without sacrificing accuracy or stability.
FAQ
What is the maximum input voltage for MAX6018BEUR21?
The MAX6018BEUR21 supports an absolute maximum input voltage of +6V referenced to GND, but its specified operating range is 2.25V to 5.5V. Operation above 5.5V violates the Absolute Maximum Ratings and risks permanent damage. For reliable function, VIN must remain within the 2.25V–5.5V window, where line regulation and output accuracy are guaranteed per datasheet specifications.
Does MAX6018BEUR21 require an external resistor like shunt references?
No, MAX6018BEUR21 is a three-terminal series voltage reference and does not require an external current-setting resistor. Unlike two-terminal shunt references, it draws a fixed, ultra-low supply current (≤6µA) independent of load or input voltage-simplifying design, reducing component count, and eliminating resistor power loss and tolerance errors in the reference path.
Can MAX6018BEUR21 drive a 10nF capacitor directly?
No-MAX6018BEUR21 is stable only with output capacitance between 100pF and 1µF, as confirmed in the Applications Information section. A 10nF (10,000pF) capacitor exceeds the 1µF upper limit and may cause oscillation or poor transient response. Use 100pF–1µF ceramic capacitors; for larger filtering needs, add RC post-filtering after the reference output.
What is the short-circuit current capability of MAX6018BEUR21?
MAX6018BEUR21 can sink up to 4mA from VIN and source up to 10mA into GND under short-circuit conditions, as specified in the Electrical Characteristics table for the 2.048V variant. This robust fault current handling protects the device during accidental output shorts while maintaining safe junction temperature under continuous operation.
How does the supply current of MAX6018BEUR21 vary with temperature?
MAX6018BEUR21 supply current varies from 3µA (min) to 6µA (max) across the full -40°C to +85°C operating range, with typical values of ~4–5µA. The variation is monotonic and well-characterized-shown in Figure MAX6018 toc13-ensuring predictable system power budgeting without derating or guard-banding for thermal effects.
MAX6018BEUR21 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:
- 1 mA
- Tolerance:
- ±0.4%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- 50µVp-p
- Noise - 10Hz to 10kHz:
- 175µVrms
- Voltage - Input:
- 2.25V ~ 5.5V
- Current - Supply:
- 6µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6018BEUR21 FAQ
1.How can I place an order for MAX6018BEUR21 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6018BEUR21 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 MAX6018BEUR21 reliable?
The price and inventory of MAX6018BEUR21 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6018BEUR21 is usually 5 days.
3.What payment methods are accepted for MAX6018BEUR21?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6018BEUR21 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6018BEUR21?
MAX6018BEUR21 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6018BEUR21 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 MAX6018BEUR21?
For technical support, including MAX6018BEUR21 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6018BEUR21 requirements.
6.How does Aetrix verify that MAX6018BEUR21 is sourced from the original manufacturer or authorized distributors?
All MAX6018BEUR21 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 MAX6018BEUR21 meets industry standards.
7.What is the process for return or replacement of MAX6018BEUR21?
All MAX6018BEUR21 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6018BEUR21, 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 MAX6018BEUR21 part is unused and in its original packaging.
Return procedure for MAX6018BEUR21:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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