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Analog Devices Inc./Maxim Integrated MAX6018BEUR21+T
- Part No.:
- MAX6018BEUR21+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6018BEUR21+T.pdf
- Description:
- IC VREF SERIES 0.4% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,431
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Product details
Overview
MAX6018BEUR21+T from Maxim Integrated is a precision, low-dropout, micropower bandgap voltage reference in a 3-pin SOT23 package. It delivers a stable 2.048V output with ±0.4% initial accuracy, 50ppm/°C max temperature drift, and operates from 2.25V to 5.5V input while consuming ≤6μA over temperature - ideal for battery-monitoring circuits in two-cell alkaline systems.
For engineers reviewing the MAX6018BEUR21+T datasheet, MAX6018BEUR21+T pinout, MAX6018BEUR21+T application, or MAX6018BEUR21+T equivalent, key selection criteria include dropout voltage (≤200mV at 1mA), supply-current independence from VIN (0.1μA/V variation), load regulation (≤1000μV/mA), and guaranteed stability with 100pF–1μF capacitive loads.
Technical Context
The MAX6018BEUR21+T uses a BiCMOS bandgap core with internal trimming to achieve tight initial accuracy and low thermal drift. Its three-terminal architecture eliminates external resistor requirements, unlike shunt references, and supports both sourcing (up to 1mA) and sinking (up to 4mA) operation.
It features dynamic performance including 175μVRMS noise (10Hz–10kHz), 85dB ripple rejection at 120Hz, and 200μs turn-on settling time to 0.1% with 5nF load capacitance - enabling use in precision ADC biasing and low-power sensor signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±0.4% (±8.2mV) at +25°C - enables direct interface with 12-bit SAR ADCs requiring precise VREF |
| Temperature Drift | ≤50ppm/°C - contributes ≤±0.92mV error over –40°C to +85°C operating range |
| Dropout Voltage | ≤200mV at 1mA load - allows operation down to 2.25V input, supporting end-of-life two-cell alkaline (≈1.125V/cell) |
| Supply Current | ≤6μA over full temperature range - extends battery life in always-on monitoring systems |
| Line Regulation | ≤330μV/V from 2.25V to 5.5V - ensures <±0.3mV output shift across full input range |
| Load Regulation | ≤1000μV/mA (0 to +1mA), ≤50μV/μA (–1mA to 0) - maintains accuracy under varying sensor or ADC load conditions |
| Noise (10Hz–10kHz) | 175μVRMS - limits added noise to <0.04% of full-scale for 2.048V reference in 16-bit systems |
Pinout & Package
MAX6018BEUR21+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 1.0mm height - suitable for space-constrained portable designs.
| 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 optimization |
| 2 (OUT) | Reference Voltage Output | Delivers regulated 2.048V; stable with 100pF–1μF capacitive load; connects directly to ADC REF pin or op-amp reference input |
| 3 (GND) | Ground Reference | Low-impedance return path; must be tied to system analog ground with minimal trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | ≤6μA max supply current over –40°C to +85°C - reduces quiescent power to <13.5μW at 2.25V |
| Supply-Voltage-Independent Current | ΔIIN/ΔVIN ≤ 0.5μA/V - eliminates output error from battery voltage sag during discharge |
| Low Dropout | 200mV max at 1mA - enables operation with single Li-ion or two alkaline cells near end-of-life |
| Capacitive-Load Stability | Stable with 100pF to 1μF output capacitance - accommodates ceramic decoupling and long PCB traces without oscillation |
| Precision Trimmed Output | 2.048V nominal with ±0.4% initial tolerance - matches standard 12-bit DAC/ADC full-scale codes (212 = 4096; 2.048V × 2 = 4.096V) |
Applications
| Battery Voltage Monitoring | Data Acquisition Systems |
|---|---|
Use Scenario: Real-time measurement of two-cell alkaline battery voltage in wireless sensor nodes. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for 12-bit ADC converting battery voltage via resistive divider. Use Value: Enables accurate state-of-charge estimation down to 1.125V/cell (2.25V total) with <±0.92mV drift-induced error over temperature. | Use Scenario: High-resolution analog front-end in portable environmental data loggers. IC Role / Device Role / Timing Role: Supplies reference voltage to successive-approximation ADC sampling thermistor, humidity, and gas sensors. Use Value: 175μVRMS noise and 85dB PSRR ensure <0.04% reference-induced error in 16-bit-equivalent measurements. |
| Hand-Held Medical Devices | Industrial Process Control |
Use Scenario: Power-efficient blood glucose meter using disposable electrochemical test strips. IC Role / Device Role / Timing Role: References transimpedance amplifier and ADC measuring strip current response. Use Value: ≤200mV dropout and ≤6μA supply current extend single-CR2032 battery life beyond 500 tests. | Use Scenario: Low-power 4–20mA loop-powered transmitter for remote temperature sensing. IC Role / Device Role / Timing Role: Sets precision reference for DAC generating loop current; operates from minimal headroom supplied by loop voltage. Use Value: 50ppm/°C drift and 0.1μA/V supply-current variation maintain calibration integrity across wide ambient and loop-voltage ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6018AEUR21+T | Same package and pinout; ±0.2% initial accuracy (vs. ±0.4% for MAX6018BEUR21+T); identical tempco, noise, and dropout | Suitable where tighter initial tolerance is required for calibration-critical systems without re-trimming | Select MAX6018AEUR21+T when absolute initial accuracy >0.2% is mandated; otherwise MAX6018BEUR21+T offers cost advantage |
| ADR3420ARJZ-R7 | 2.048V output, ±0.1% initial accuracy, 30ppm/°C max drift, but 8μA max supply current and 300mV dropout | Better accuracy and drift, but higher dropout limits use below 2.35V input; larger 6-lead SOT23 package | Choose ADR3420ARJZ-R7 only if 0.1% accuracy and 30ppm/°C drift outweigh higher power and reduced low-voltage headroom |
Compared with MAX6018AEUR21+T, the MAX6018BEUR21+T trades 0.2% initial accuracy for lower cost while retaining identical dynamic performance and thermal behavior; versus ADR3420ARJZ-R7, it offers lower dropout and supply current at the expense of initial tolerance and temperature drift specs.
Availability
MAX6018BEUR21+T is available at Aetrix Electronics and suitable for battery-monitoring systems, portable medical devices, industrial 4–20mA transmitters, and precision data-acquisition modules requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6018BEUR21+T 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, and interface applications in industrial, automotive, and consumer markets.
The MAX6018 family targets ultra-low-power, precision voltage referencing in space- and energy-constrained systems - especially battery-operated equipment requiring extended runtime and stable accuracy across temperature.
FAQ
What is the minimum input voltage required for stable operation of the MAX6018BEUR21+T?
The MAX6018BEUR21+T requires a minimum input voltage of VOUT + 200mV = 2.248V, specified as 2.25V in datasheet conditions. This 200mV dropout enables reliable regulation even as two-cell alkaline batteries discharge to end-of-life voltages (~1.125V per cell). Below this threshold, output voltage drops linearly with input.
Does the MAX6018BEUR21+T require an external resistor like shunt references?
No, the MAX6018BEUR21+T is a three-terminal series voltage reference and does not require an external current-setting resistor. Unlike two-terminal shunt references, its supply current remains nearly constant (≤6μA) regardless of input voltage - eliminating wasted current and simplifying design in battery-powered systems.
Can the MAX6018BEUR21+T drive a 10nF ceramic capacitor directly at its output?
Yes - the MAX6018BEUR21+T is stable with output capacitance from 100pF up to 1μF, so a 10nF ceramic capacitor falls well within its qualified range. This ensures robust transient response and PSRR enhancement without risk of oscillation, provided the capacitor has low ESR and is placed close to the OUT and GND pins.
How does the supply current of the MAX6018BEUR21+T vary with temperature?
The MAX6018BEUR21+T draws ≤6μA over its full –40°C to +85°C operating range, with typical current of 3–5μA at +25°C. Its supply current increases only marginally with temperature - confirmed by typical operating curves showing <1μA rise from –40°C to +85°C at fixed 2.25V input - ensuring predictable battery drain across environments.
Is the MAX6018BEUR21+T pin-compatible with other members of the MAX6018 family?
Yes - all MAX6018 variants, including MAX6018BEUR21+T, share identical 3-pin SOT23-3 pinout (IN, OUT, GND), same package outline (21-0051), and compatible land pattern (90-0179). This allows drop-in replacement between output voltage options (1.2V, 1.6V, 1.8V, 2.048V) and grade versions (A/B) without PCB layout changes.
MAX6018BEUR21+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX6018BEUR21+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6018BEUR21+T 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+T reliable?
The price and inventory of MAX6018BEUR21+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6018BEUR21+T is usually 5 days.
3.What payment methods are accepted for MAX6018BEUR21+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6018BEUR21+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6018BEUR21+T?
MAX6018BEUR21+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6018BEUR21+T 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+T?
For technical support, including MAX6018BEUR21+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6018BEUR21+T requirements.
6.How does Aetrix verify that MAX6018BEUR21+T is sourced from the original manufacturer or authorized distributors?
All MAX6018BEUR21+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX6018BEUR21+T?
All MAX6018BEUR21+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6018BEUR21+T, 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+T part is unused and in its original packaging.
Return procedure for MAX6018BEUR21+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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