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Analog Devices Inc./Maxim Integrated MAX6191BESA+
- Part No.:
- MAX6191BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6191BESA+.pdf
- Description:
- IC VREF SERIES 0.24% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:128
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Product details
Overview
MAX6191BESA+ from Maxim Integrated is a precision, micropower, low-dropout series-mode bandgap voltage reference delivering 2.048V output with ±2mV initial accuracy, 5ppm/°C max temperature coefficient, and 35µA max quiescent supply current. It operates from 2.5V to 12.6V input, supports ±500µA load current, and is used in high-accuracy ADC/DAC biasing, portable instrumentation, and industrial process control systems requiring stable low-power references.
For engineers reviewing the MAX6191BESA+ datasheet, MAX6191BESA+ pinout, MAX6191BESA+ application, or MAX6191BESA+ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated SO-8 pin mapping, application-specific implementation insights, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The MAX6191BESA+ employs a proprietary curvature-correction circuit and laser-trimmed thin-film resistors to achieve <5ppm/°C temperature coefficient and ±2mV initial accuracy over –40°C to +85°C. Its series-mode architecture enables bidirectional load capability (±500µA) with only 100mV dropout at full sink/source load.
Internally compensated for stability with capacitive loads up to 2.2nF, it achieves 30µs turn-on settling time to 0.1% and exhibits 0.12µV/µA load regulation and 10µV/V line regulation - critical for precision data-conversion front-ends where supply and load transients must not perturb reference integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±2mV (ensures ≤0.1% absolute error at room temperature for 12-bit+ ADC/DAC full-scale calibration) |
| Temp Coefficient | ≤5ppm/°C (guarantees <±100µV drift over –40°C to +85°C ambient, enabling uncalibrated operation in industrial environments) |
| Quiescent Current | ≤35µA (enables >1-year battery life in 10µA-average-power handheld meters using coin-cell sources) |
| Dropout Voltage | 100mV at 500µA load (allows operation from 2.5V rails while maintaining regulation, supporting modern low-voltage microcontrollers) |
| Load Regulation | 0.12µV/µA (limits output shift to <60µV across full ±500µA load range - essential for ratiometric sensor excitation) |
| Line Regulation | 10µV/V (holds output change <100µV over 2.5V–12.6V input swing, simplifying unregulated supply designs) |
| Noise (0.1–10Hz) | 105µVRMS (low enough to avoid degrading ENOB in 16-bit SAR ADCs referenced directly to this output) |
Pinout & Package
MAX6191BESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with exposed pad not electrically connected. Pin 1 is OUT, Pin 2 is IN, Pin 4 is GND; Pins 1,3,5,7,8 are No Connect (N.C.) - internally unconnected and must remain floating per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 8 | N.C. | No internal connection - must be left unconnected on PCB; no routing or grounding permitted |
| 2 | IN | Input supply terminal - accepts 2.5V to 12.6V; requires local 0.1µF bypass capacitor to GND |
| 4 | GND | Analog ground reference - must tie to clean system AGND plane with low-inductance path |
| 6 | OUT | Precision 2.048V reference output - drives ADC REF+, DAC VREF, or op-amp gain-setting networks |
Key Features
| Feature | Design Value |
|---|---|
| Initial accuracy ±2mV | Enables single-point calibration in portable test equipment without trimming potentiometers or firmware offset correction |
| Curvature-corrected bandgap | Delivers flat temperature response across –40°C to +85°C, eliminating need for external compensation circuits |
| Stable with 0–2.2nF capacitive load | Permits direct connection to ADC input capacitance or local decoupling without risk of oscillation or ringing |
| ±500µA bidirectional load drive | Supports both sourcing (e.g., op-amp bias) and sinking (e.g., current-sense amplifier reference) without external buffers |
| 30µs turn-on settling (to 0.1%) | Allows fast power cycling in battery-powered IoT nodes - reference stabilizes before first ADC conversion |
Applications
| Hand-Held Instruments | Analog-to-Digital Converters |
|---|---|
Use Scenario: Battery-powered multimeter measuring DC voltage with 16-bit resolution. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for SAR ADC, enabling accurate ratiometric measurement against internal 2.048V full-scale range. Use Value: ±2mV initial accuracy and 5ppm/°C TC ensure <±0.02% total error over temperature without recalibration - meeting Class II handheld meter standards. |
Use Scenario: Industrial PLC analog input module digitizing 4–20mA sensor signals. IC Role / Device Role / Timing Role: Supplies precise 2.048V reference to 18-bit sigma-delta ADC, defining LSB size for current-to-digital conversion. Use Value: 0.12µV/µA load regulation prevents reference droop during multiplexed channel switching, preserving measurement repeatability across all 8 channels. |
| Industrial Process Control | Precision 3V/5V Systems |
Use Scenario: Loop-powered transmitter conditioning thermocouple output for 4–20mA transmission. IC Role / Device Role / Timing Role: Generates stable 2.048V reference for cold-junction compensation circuitry and ADC reference. Use Value: 35µA quiescent current allows full functionality within 3.5mA loop budget; 100mV dropout enables operation from 3.3V rail derived from loop supply. |
Use Scenario: FPGA-based data acquisition board with dual 3.3V and 5V domains requiring matched reference accuracy. IC Role / Device Role / Timing Role: Serves as primary reference for ADCs and DACs operating from 3.3V supply, with 2.048V chosen for optimal 12-bit binary scaling. Use Value: Identical TC and long-term stability (50ppm/1000hrs) as higher-voltage MAX6195 family members enables consistent calibration across mixed-voltage subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6191AESA+ | ±4mV initial accuracy (vs. ±2mV), otherwise identical specs and pinout | Suitable where cost sensitivity outweighs need for tightest initial tolerance; acceptable for post-calibration systems | Select MAX6191AESA+ when B-grade accuracy suffices and budget constraints apply - same footprint and layout |
| REF3020AIDBZR | 2.048V output, ±1% initial accuracy (±20.5mV), 50ppm/°C TC, 50µA IQ, SOT-23-3 package | Higher drift and looser accuracy limit use to non-critical biasing; smaller package saves space but lacks N.C. pin isolation | Choose REF3020AIDBZR only for space-constrained, cost-driven designs accepting reduced stability - not drop-in compatible due to 3-pin vs. 8-pin SO |
Compared with MAX6191BESA+, MAX6191AESA+ offers identical performance except relaxed initial accuracy, making it a direct-fit alternative for calibrated systems; REF3020AIDBZR trades precision and thermal stability for size and cost, requiring PCB redesign and firmware compensation.
Availability
MAX6191BESA+ is available at Aetrix Electronics and suitable for hand-held instruments, analog-to-digital converters, and industrial process control systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6191BESA+ 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 demanding industrial, medical, and communications applications, emphasizing low power, high accuracy, and robustness.
The MAX6190–MAX6195/MAX6198 family was engineered specifically for micropower, high-stability voltage referencing in battery-operated and space-constrained instrumentation - prioritizing ultra-low IQ, sub-5ppm/°C TC, and load flexibility without external compensation.
FAQ
What is the maximum load current supported by the MAX6191BESA+?
The MAX6191BESA+ supports bidirectional load current up to ±500µA - meaning it can source up to 500µA to a load or sink up to 500µA from a load while maintaining specified accuracy and dropout voltage. This capability eliminates the need for external buffer amplifiers in most precision analog signal chains involving the MAX6191BESA+.
Does the MAX6191BESA+ require an output capacitor for stability?
No, the MAX6191BESA+ is internally compensated and stable with capacitive loads from 0 to 2.2nF - including no external capacitor. An output capacitor is optional and recommended only in applications subject to fast load or supply transients, where it reduces overshoot/undershoot and improves transient response; its absence does not compromise stability of the MAX6191BESA+.
What is the minimum input voltage required for the MAX6191BESA+ to regulate at full load?
The MAX6191BESA+ requires a minimum input voltage of (VOUT + 0.2V) = 2.248V to maintain regulation at full ±500µA load. Its specified dropout voltage is 100mV at 500µA, so with 2.048V output, 2.148V is sufficient under typical conditions - but the datasheet guarantees operation down to 2.248V across temperature and process variation, ensuring robustness in the MAX6191BESA+ design.
How does the MAX6191BESA+ compare to shunt voltage references in terms of supply efficiency?
Unlike shunt references that draw constant current regardless of load, the MAX6191BESA+ draws only ≤35µA quiescent current - independent of load - because it is a series-mode device. This makes the MAX6191BESA+ significantly more efficient, especially in low-duty-cycle or variable-load applications, extending battery life and reducing thermal load compared to shunt alternatives.
Can the MAX6191BESA+ be used in automotive applications?
The standard MAX6191BESA+ is rated for –40°C to +85°C and is not qualified to AEC-Q200. However, Maxim offers automotive-grade variants (e.g., MAX6191BESA/V+) with extended testing and traceability. For automotive use, specify the /V+ suffix version - the MAX6191BESA+ itself is intended for industrial and commercial applications only.
MAX6191BESA+ 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 500 µA
- Tolerance:
- ±0.24%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 40µVp-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:
- 8-SOIC
MAX6191BESA+ FAQ
1.How can I place an order for MAX6191BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6191BESA+ 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 MAX6191BESA+ reliable?
The price and inventory of MAX6191BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6191BESA+ is usually 5 days.
3.What payment methods are accepted for MAX6191BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6191BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6191BESA+?
MAX6191BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6191BESA+ 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 MAX6191BESA+?
For technical support, including MAX6191BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6191BESA+ requirements.
6.How does Aetrix verify that MAX6191BESA+ is sourced from the original manufacturer or authorized distributors?
All MAX6191BESA+ 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 MAX6191BESA+ meets industry standards.
7.What is the process for return or replacement of MAX6191BESA+?
All MAX6191BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6191BESA+, 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 MAX6191BESA+ part is unused and in its original packaging.
Return procedure for MAX6191BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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