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Analog Devices Inc./Maxim Integrated MAX6166BESA+
- Part No.:
- MAX6166BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6166BESA+.pdf
- Description:
- IC VREF SERIES 0.2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,946
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Product details
Overview
MAX6166BESA+ from Maxim Integrated is a precision, low-dropout, micropower series voltage reference delivering a stable 2.500V output with ±5mV initial accuracy and 4–10ppm/°C temperature coefficient over -40°C to +85°C. It sources up to 5mA while drawing only 100–120μA quiescent current, features 50–200mV dropout at 1mA, and operates from VOUT + 0.2V to 12.6V - ideal for high-accuracy ADC biasing in portable instrumentation.
For engineers reviewing the MAX6166BESA+ datasheet, MAX6166BESA+ pinout, MAX6166BESA+ application, or MAX6166BESA+ equivalent, key selection considerations include its SO-8 package, ground-referenced output architecture, load regulation of 0.5–0.9mV/mA (sourcing), no external capacitor requirement, and compatibility with space-constrained, battery-powered systems requiring <10ppm/°C stability.
Technical Context
The MAX6166BESA+ employs a proprietary curvature-correction circuit and laser-trimmed thin-film resistors to achieve low thermal drift and high initial accuracy. Its BiCMOS process (117 transistors) enables internal compensation, eliminating need for external stabilization capacitors.
As a three-terminal series-mode reference, it draws supply current virtually independent of input voltage (ΔIIN/ΔVIN ≤ 8.0μA/V), unlike shunt-mode alternatives that waste current via external resistors. It supports bidirectional load current (±2mA sink/source) and maintains stability with ≥1μF capacitive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V (±5mV at +25°C); enables precise scaling for 12-bit+ SAR ADCs referencing VREF = VDD/2 or fixed-ratio conversion. |
| Temp Coefficient | 4–10ppm/°C (max); ensures ≤±0.22mV drift over full -40°C to +85°C range - critical for field-deployed sensors. |
| Dropout Voltage | 50–200mV at 1mA load; allows operation from 2.7V supply in 3.0V systems with margin for battery sag. |
| Quiescent Current | 100–120μA typical; extends runtime in coin-cell–powered devices beyond 10 years at 1μA average system load. |
| Load Regulation | 0.5–0.9mV/mA sourcing; holds output within ±4.5mV across full 5mA load range - suitable for driving ADC reference inputs and op-amp bias networks. |
| Noise (0.1–10Hz) | 27μVp-p; contributes <0.01% error in 2.5V full-scale measurements - negligible for 16-bit data acquisition. |
| Ripple Rejection | 76dB at 120Hz; suppresses AC line noise on unregulated supplies without additional filtering. |
Pinout & Package
MAX6166BESA+ is housed in an 8-pin SO (Small Outline) package with exposed pad (RoHS-compliant, lead-free). Pins 1, 3, 5, 7, and 8 are No Connect (N.C.), internally unconnected. The device uses a ground-referenced output architecture with dedicated IN and OUT terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 8 | No Connection (N.C.) | Not bonded or routed internally; may be left floating or tied to GND for mechanical stability - no electrical function. |
| 2 | IN | Input voltage terminal; accepts 2.7V to 12.6V; requires local 0.1μF ceramic bypass if high line-transient immunity is needed. |
| 4 | GND | Analog ground reference; must be connected to clean system ground plane to minimize noise coupling into reference output. |
| 6 | OUT | Precision 2.500V output; drives ADC reference pins, DAC bias, or op-amp gain-setting networks; stable without external capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary curvature correction | Reduces second-order thermal drift, enabling 4–10ppm/°C performance without external trimming components. |
| Laser-trimmed thin-film resistors | Guarantees ±5mV initial accuracy at +25°C and long-term stability of 80ppm/1000hr - reduces calibration overhead in production test. |
| No external capacitor required | Internally compensated design eliminates 1–10μF output capacitor, saving >2mm² PCB area in ultra-compact wearables and IoT nodes. |
| Supply-current independence | ΔIIN/ΔVIN ≤ 8.0μA/V ensures consistent 100–120μA draw across 2.7–12.6V input range - simplifies power budgeting in multi-rail systems. |
| Stable with 1μF capacitive loads | Supports direct connection to switched-capacitor ADC inputs or noisy digital loads without oscillation - avoids ferrite bead or RC snubbing. |
Applications
| Portable Digital Multimeters (DMMs) | Industrial 4–20mA Transmitter Calibration |
|---|---|
Use Scenario: High-precision handheld DMM measuring DC voltage with 0.01% basic accuracy. IC Role / Device Role / Timing Role: Primary 2.500V reference for dual-slope or sigma-delta ADC front-end, directly setting measurement full-scale. Use Value: ±5mV initial accuracy and 10ppm/°C drift ensure calibration validity over 24 months without field recalibration. |
Use Scenario: Loop-powered 4–20mA transmitter requiring stable excitation for RTD or strain-gauge bridges. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric bridge excitation and ADC reference in analog signal chain. Use Value: Low 100μA quiescent current leaves >3.5mA headroom for loop-powered operation while maintaining <0.02% span error. |
| Medical Patient Monitor ECG Front-End | Battery-Powered Data Loggers |
Use Scenario: Low-noise ECG amplifier with 24-bit delta-sigma ADC sampling biopotential signals. IC Role / Device Role / Timing Role: Low-noise 2.500V reference for ADC and programmable gain amplifier (PGA) biasing. Use Value: 27μVp-p (0.1–10Hz) noise contributes <0.16 LSB error in 24-bit conversion - preserves diagnostic resolution. |
Use Scenario: Long-life environmental sensor node logging temperature/humidity every 10 minutes using coin-cell battery. IC Role / Device Role / Timing Role: Stable reference for microcontroller's internal ADC during periodic wake-up and measurement cycles. Use Value: 100μA supply current and no external capacitor extend 220mAh CR2032 battery life to >5 years at 10-second wake intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3425ARJZ-R7 | 2.5V output, ±2mV initial accuracy, 3ppm/°C TC, SOT-23-5 package, 120μA IQ, requires 1μF output cap for stability. | Smaller footprint but higher accuracy; less suitable for space-critical designs where capacitor omission is mandatory. | Select ADR3425ARJZ-R7 when tighter initial tolerance (<±2mV) justifies added board area for output capacitor. |
| REF5025IDR | 2.5V output, ±0.5mV initial accuracy, 3ppm/°C TC, SO-8 package, 950μA IQ, 10mA output drive, requires 1–10μF output cap. | Higher drive capability and lower drift, but 9.5× higher quiescent current limits use in ultra-low-power systems. | Select REF5025IDR when driving heavy loads (>5mA) or needing sub-3ppm/°C stability outweighs battery-life constraints. |
Compared with ADR3425ARJZ-R7 and REF5025IDR, MAX6166BESA+ uniquely balances ultra-low quiescent current (100μA), no-output-capacitor operation, and SO-8 manufacturability - making it optimal for cost-sensitive, space-constrained, battery-operated instrumentation where ±5mV accuracy suffices.
Availability
MAX6166BESA+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, medical diagnostics equipment, and battery-powered data loggers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6166BESA+ 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 precision, power, and interface applications in industrial, medical, and communications markets.
The MAX6161–MAX6168 family was engineered specifically for micropower, low-dropout voltage references in space- and energy-constrained systems - emphasizing zero-external-component operation, wide input range, and guaranteed performance across extended temperature ranges.
FAQ
What is the output voltage tolerance and temperature coefficient of MAX6166BESA+?
The MAX6166BESA+ delivers a nominal 2.500V output with ±5mV initial accuracy at +25°C and a maximum temperature coefficient of 10ppm/°C over -40°C to +85°C. Its electrical table specifies VOUT = 2.495V (min) to 2.505V (max) at +25°C, and TCVOUT = 4–10ppm/°C depending on unit variation - confirmed in the MAX6166-specific characterization section of the datasheet.
Does MAX6166BESA+ require an external output capacitor for stability?
No, MAX6166BESA+ does not require an external output capacitor for stability due to internal compensation. The datasheet explicitly states "no external capacitor required" and confirms stability with ≥1μF capacitive loads. This eliminates board area and BOM cost - a key differentiator versus alternatives like REF5025IDR that mandate 1–10μF output capacitance.
What is the maximum load current MAX6166BESA+ can source or sink?
MAX6166BESA+ can source up to 5mA and sink up to 2mA across the full temperature range. Load regulation is specified as 0.5–0.9mV/mA for sourcing and 1.6–5mV/mA for sinking. These values are measured under conditions defined in the MAX6166 Electrical Characteristics table and validated in typical operating curves (e.g., MAX6166 toc09).
What is the minimum input voltage required for MAX6166BESA+ to maintain regulation?
The minimum input voltage for MAX6166BESA+ is VOUT + 0.2V = 2.7V (guaranteed), with a maximum dropout voltage of 200mV at 1mA load. The absolute maximum ratings specify IN as -0.3V to +13.5V, and the supply voltage range is tested from VOUT + 0.2V to 12.6V - ensuring reliable operation down to 2.7V even with battery voltage sag.
How does the quiescent supply current of MAX6166BESA+ vary with input voltage?
MAX6166BESA+ exhibits exceptional supply-current stability: quiescent current is 100–120μA typical and varies by only ≤8.0μA/V across its input range (VOUT + 0.2V to 12.6V). This near-constant draw - confirmed in Figure toc13 and toc14 - contrasts sharply with shunt references whose current scales linearly with input voltage, making MAX6166BESA+ ideal for wide-input-voltage battery systems.
MAX6166BESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 27µVp-p
- Noise - 10Hz to 10kHz:
- 30µVrms
- Voltage - Input:
- 2.7V ~ 12.6V
- Current - Supply:
- 120µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6166BESA+ FAQ
1.How can I place an order for MAX6166BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6166BESA+ 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 MAX6166BESA+ reliable?
The price and inventory of MAX6166BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6166BESA+ is usually 5 days.
3.What payment methods are accepted for MAX6166BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6166BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6166BESA+?
MAX6166BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6166BESA+ 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 MAX6166BESA+?
For technical support, including MAX6166BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6166BESA+ requirements.
6.How does Aetrix verify that MAX6166BESA+ is sourced from the original manufacturer or authorized distributors?
All MAX6166BESA+ 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 MAX6166BESA+ meets industry standards.
7.What is the process for return or replacement of MAX6166BESA+?
All MAX6166BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6166BESA+, 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 MAX6166BESA+ part is unused and in its original packaging.
Return procedure for MAX6166BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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