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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:2,599
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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 sourcing/sinking, 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, key selection criteria include initial voltage error tolerance, temperature drift over -40°C to +85°C, dropout performance at 500µA, capacitive-load stability up to 2.2nF, and compatibility with battery-powered precision analog signal chains.
Technical Context
The MAX6191BESA employs a proprietary curvature-correction circuit and laser-trimmed thin-film resistors to achieve <5ppm/°C temperature coefficient and ±2mV (0.098% of 2.048V) initial accuracy. Its series-mode architecture enables bidirectional load current (±500µA) with only 100mV dropout at full sink/source.
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 high-resolution data acquisition where supply and load transients must not perturb reference integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±2mV (guaranteed initial accuracy enables direct interface with 12-bit SAR ADCs without trimming) |
| Temp Coefficient | ≤5ppm/°C (max drift of ±0.42mV over -40°C to +85°C; meets industrial-grade stability requirements) |
| Quiescent Current | ≤35µA (enables >10-year battery life in 10µA-average-power handheld meters) |
| Dropout Voltage | 100mV at 500µA load (supports operation down to VIN = 2.148V; suitable for single-cell Li-ion or 3V systems) |
| Load Regulation | 0.12µV/µA (output shift ≤60µV across full ±500µA load range; preserves LSB accuracy in 16-bit DACs) |
| Capacitive Load Stability | 0–2.2nF (no minimum COUT required; eliminates board space and cost of external capacitor) |
| Line Regulation | 10µV/V (output variation ≤126µV over 2.5V–12.6V input; robust against supply ripple in shared-rail systems) |
Pinout & Package
MAX6191BESA is housed in an 8-pin SO (Small Outline) package with RoHS-compliant lead-free finish. Pin 1 is OUT (2.048V reference output), Pin 2 is IN (supply input), Pin 4 is GND, and Pins 1,3,5,7,8 are No Connect (N.C.). The package outline conforms to Maxim's S8+2 standard (outline no. 21-0041).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 8 | N.C. | No internal connection; must be left floating or tied to GND per layout best practice - no electrical function |
| 2 | IN | Supply input (2.5V–12.6V); accepts fast transients up to ±200µA during turn-on |
| 4 | GND | Analog ground reference; requires low-impedance connection to system AGND plane |
| 6 | OUT | 2.048V precision reference output; capable of sourcing/sinking ±500µA with <100mV dropout |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film resistors | Enables ±2mV initial accuracy and <5ppm/°C tempco without external calibration |
| Curvature-correction circuit | Compensates second-order thermal effects to maintain monotonic VOUT vs. temperature |
| Series-mode topology | Eliminates need for external bias resistor; supply current remains ~35µA regardless of load state |
| Internal compensation | Stable with 0–2.2nF output capacitance - avoids instability risks of external compensation networks |
| Bidirectional load capability | Sinks or sources up to 500µA, enabling use in both high-side and low-side reference configurations |
Applications
| Hand-Held Instruments | Analog-to-Digital Converters |
|---|---|
Use Scenario: Portable multimeter measuring DC voltage with 0.1% full-scale accuracy over -10°C to +50°C ambient. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for 16-bit sigma-delta ADC front-end. Use Value: ±2mV initial error and 5ppm/°C drift ensure measurement repeatability without field recalibration. |
Use Scenario: Battery-powered data logger sampling thermocouple signals via PGA and 16-bit SAR ADC. IC Role / Device Role / Timing Role: Precision reference for ADC conversion - directly sets full-scale range and LSB weight. Use Value: 0.12µV/µA load regulation prevents code errors when PGA gain switching alters reference loading. |
| Industrial Process Control | Precision 3V/5V Systems |
Use Scenario: 4–20mA transmitter module operating in harsh factory environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Reference for DAC generating precise loop-current setpoint; also biases sensor signal conditioning. Use Value: Guaranteed 5ppm/°C max tempco ensures <±0.5°C equivalent error in temperature-critical loop control. |
Use Scenario: Low-power IoT node powered by coin cell or energy harvester, using 3.3V LDO and 2.048V reference. IC Role / Device Role / Timing Role: Low-dropout reference enabling operation from 2.15V input (2.048V + 100mV dropout). Use Value: 35µA quiescent current minimizes standby power draw, extending operational lifetime by >3× vs. legacy references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3020AIDBZR | 2.048V output, ±0.2% initial accuracy (±4.1mV), 50ppm/°C max tempco, 50µA IQ, SOT-23-3 package | Higher initial error and drift; suited for cost-sensitive, non-critical applications | Select REF3020AIDBZR only if ±4.1mV error and wider tempco are acceptable for the target resolution |
| ADR3420ARJZ-R7 | 2.048V output, ±0.1% initial accuracy (±2.05mV), 10ppm/°C max tempco, 120µA IQ, SOT-23-5 package | Lower initial error but higher IQ and tempco; requires external decoupling capacitor | Choose ADR3420ARJZ-R7 when tighter initial accuracy is prioritized over power and thermal stability |
Compared with REF3020AIDBZR and ADR3420ARJZ-R7, MAX6191BESA delivers superior thermal stability (5ppm/°C vs. 10/50ppm/°C) and ultra-low quiescent current (35µA vs. 50/120µA), making it optimal for battery-operated precision instruments where long-term drift and standby power are critical.
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 across extended temperature ranges and multi-year production cycles.
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 portable and battery-constrained systems - balancing laser-trimmed accuracy with series-mode efficiency.
FAQ
What is the guaranteed initial accuracy of MAX6191BESA?
The MAX6191BESA guarantees ±2mV initial output voltage error at +25°C, corresponding to ±0.098% of its nominal 2.048V output. This specification is tested and ensured across all units, enabling direct use in 12-bit measurement systems without calibration. The MAX6191BESA achieves this via laser trimming of thin-film resistors during final test.
Does MAX6191BESA require an external output capacitor?
No, MAX6191BESA does not require an external output capacitor for stability. It is internally compensated and remains stable with capacitive loads from 0 to 2.2nF. Adding a capacitor (e.g., 100pF) may improve transient response in dynamic load conditions, but it is optional - reducing BOM count and PCB area in space-constrained designs like handheld meters.
What is the maximum load current MAX6191BESA can source or sink?
MAX6191BESA is specified to source or sink up to ±500µA while maintaining output accuracy within datasheet limits. At 500µA load, dropout voltage is guaranteed ≤100mV, meaning it sustains 2.048V output with input as low as 2.148V. This bidirectional capability supports both high-side and low-side reference configurations in precision analog circuits.
How does MAX6191BESA perform over temperature?
MAX6191BESA guarantees a maximum temperature coefficient of 5ppm/°C over -40°C to +85°C, translating to ≤±0.42mV total drift across the full range. Its proprietary curvature-correction circuit minimizes second-order thermal nonlinearity, ensuring monotonic behavior. Temperature hysteresis is limited to 75ppm, verified by cycling between extremes and measuring +25°C output recovery.
Is MAX6191BESA compatible with lead-free PCB assembly processes?
Yes, MAX6191BESA carries the "+" suffix (as shown in ordering info), indicating it is supplied in a lead(Pb)-free and RoHS-compliant 8-pin SO package. It is qualified for standard reflow soldering profiles with peak temperatures up to +260°C, and its package meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for surface-mount assembly.
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:
- Obsolete
- 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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