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Analog Devices Inc./Maxim Integrated MAX6191BESA+T
- Part No.:
- MAX6191BESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6191BESA+T.pdf
- Description:
- IC VREF SERIES 0.24% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
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Product details
Overview
MAX6191BESA+T from Maxim Integrated is a precision micropower low-dropout series voltage reference delivering 2.048V output with ±2mV initial accuracy, 5ppm/°C max temperature coefficient, and 35µA max quiescent current - enabling high-accuracy ADC/DAC biasing in battery-powered handheld instruments and industrial process control systems.
For engineers reviewing the MAX6191BESA+T datasheet, MAX6191BESA+T pinout, MAX6191BESA+T application, or MAX6191BESA+T equivalent, this page delivers verified specifications, SO-8 package layout, real-world load/line regulation behavior, and validated alternative options for precision analog signal chains requiring stable 2.048V references.
Technical Context
This device uses a curvature-corrected bandgap core with laser-trimmed thin-film resistors to achieve <5ppm/°C temperature coefficient and ±2mV initial accuracy over –40°C to +85°C. It operates as a series-mode reference, sourcing or sinking up to ±500µA while maintaining regulation.
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 nominal; enables precise 12-bit ADC full-scale alignment (e.g., 2.048V = 4096 × 0.5mV LSB). |
| Initial Accuracy | ±2mV max at +25°C; corresponds to ±0.098% error, eliminating need for system-level calibration in many portable instruments. |
| Temp Coefficient | ≤5ppm/°C max; contributes ≤0.41mV drift over –40°C to +85°C, supporting 16-bit effective resolution in industrial sensors. |
| Quiescent Current | ≤35µA max; draws only 105µC per second at 3V, extending coin-cell life beyond 10 years in always-on monitoring nodes. |
| Dropout Voltage | 100mV at 500µA load; allows operation from 2.148V input - compatible with single Li-ion or two alkaline cells under load. |
| Load Regulation | 0.12µV/µA; output shifts just 60µV across full ±500µA load range, preserving gain accuracy in programmable-gain amplifier front-ends. |
| Noise (0.1–10Hz) | 105µVRMS; low flicker noise ensures minimal contribution to ADC quantization uncertainty in precision weigh scales. |
Pinout & Package
MAX6191BESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and rated for –40°C to +85°C operation. Pin 1 is OUT, Pin 2 is IN, Pin 4 is GND; Pins 1, 3, 5, 7, and 8 are No Connect (N.C.).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 8 | N.C. | No internal connection; must be left unconnected or tied to GND per layout best practice - no routing or pull-up required. |
| 2 | IN | Supply input; accepts 2.5V to 12.6V; dropout headroom of 100mV at 500µA enables ultra-low-voltage operation. |
| 4 | GND | Analog ground reference; requires low-impedance star connection to minimize PSRR degradation and noise coupling. |
| 6 | OUT | Precision 2.048V output; capable of sourcing/sinking ±500µA; stable with 0–2.2nF capacitive loads without oscillation. |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-Corrected Bandgap | Enables ≤5ppm/°C TC across full temperature range - eliminates external compensation networks in medical sensor modules. |
| Laser-Trimmed Thin-Film Resistors | Guarantees ±2mV initial accuracy without post-package trimming - reduces manufacturing test time and BOM cost. |
| Series-Mode Architecture | Draws only 35µA quiescent current independent of load; avoids wasted bias current typical of shunt references in battery systems. |
| Capacitive-Load Stability | Stable with 0–2.2nF output capacitance - supports direct connection to ADC sample capacitors without added isolation resistors. |
| Fast Turn-On Settling | 30µs to 0.1% with 50pF load - enables duty-cycled power management in portable multimeters without reference warm-up delay. |
Applications
| Hand-Held Instruments | Analog-to-Digital Converters |
|---|---|
Use Scenario: Portable digital multimeter operating from two AA cells with auto-ranging and 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and internal DAC-based autoranging circuitry. Use Value: 2.048V output matches 12-bit full-scale binary count (4096), while ±2mV accuracy and 5ppm/°C TC ensure calibrated readings across battery discharge and ambient temperature shifts. |
Use Scenario: High-resolution data logger measuring thermocouple outputs via cold-junction compensation and PGA. IC Role / Device Role / Timing Role: Stable excitation and reference source for 24-bit delta-sigma ADC front-end, including PGA gain-setting resistors. Use Value: 0.12µV/µA load regulation prevents gain error when PGA switching alters reference load, and 105µVRMS low-frequency noise preserves ENOB in slow-sampling modes. |
| Industrial Process Control | Precision 3V/5V Systems |
Use Scenario: Loop-powered 4–20mA transmitter with HART modulation, powered from 12–36V loop supply. IC Role / Device Role / Timing Role: Precision reference for current-loop DAC and sensor signal conditioning circuitry within tight thermal envelope. Use Value: 35µA quiescent current minimizes burden on loop power budget; 100mV dropout allows regulation even during low-loop-voltage brownout conditions (e.g., 12.6V − 100mV = 12.5V min). |
Use Scenario: Industrial PLC analog input module accepting ±10V, 0–20mA, and RTD inputs with shared 3.3V/5V logic and analog rails. IC Role / Device Role / Timing Role: Secondary reference for calibration offset correction and ratiometric sensor scaling against main 3.3V or 5V supply. Use Value: 10µV/V line regulation ensures reference remains stable despite ripple on noisy 3.3V/5V rails; SO-8 package simplifies placement near ADCs without requiring dedicated reference PCB area. |
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 TC, 50µA quiescent current, SOT-23-3 package. | Higher initial error and TC; less suitable for 16-bit systems; smaller footprint but no N.C. pins for layout flexibility. | Select REF3020AIDBZR only if board space is constrained and ±0.2% accuracy suffices - not recommended for metrology-grade calibration. |
| ADR3420ARJZ-R7 | 2.048V output, ±0.1% initial accuracy (±2.05mV), 10ppm/°C TC, 120µA quiescent current, SOT-23-5 package. | Lower initial error but higher TC and 3.4× higher supply current; requires external decoupling for 2.2nF stability. | Choose ADR3420ARJZ-R7 when tighter initial tolerance is prioritized over temperature drift and battery life - verify layout supports required 1µF bypass. |
Compared with REF3020AIDBZR and ADR3420ARJZ-R7, MAX6191BESA+T uniquely combines ±2mV accuracy, ≤5ppm/°C TC, and ≤35µA supply current in an SO-8 package - making it optimal for portable, high-resolution, long-life instrumentation where all three parameters are simultaneously critical.
Availability
MAX6191BESA+T 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 lot history.
Supply support for MAX6191BESA+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 precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6190–MAX6195/MAX6198 family was engineered specifically for micropower, high-accuracy voltage referencing in battery-operated and space-constrained measurement systems - emphasizing low drift, low noise, and wide input voltage tolerance.
FAQ
What is the maximum load current supported by MAX6191BESA+T while maintaining regulation?
MAX6191BESA+T can source or sink up to ±500µA while maintaining output regulation within specified limits. At 500µA load, dropout voltage is guaranteed ≤100mV, and load regulation is specified at 0.12µV/µA - meaning total output shift is ≤60µV across the full ±500µA range. This capability supports direct driving of ADC reference inputs and small-signal op-amp bias networks without external buffers.
Does MAX6191BESA+T require an external output capacitor for stability?
No, MAX6191BESA+T is internally compensated and stable with output capacitance ranging from 0 to 2.2nF. An external capacitor is optional and used only to improve transient response during load or supply steps - for example, adding a 100pF capacitor reduces overshoot in fast-switching multiplexed ADC applications. The SO-8 layout accommodates optional COUT without compromising stability.
How does the supply current of MAX6191BESA+T vary with input voltage?
MAX6191BESA+T exhibits exceptionally flat supply current: quiescent current is ≤35µA across its full 2.5V to 12.6V input range, varying by only 0.8µA/V. This near-constant draw - unlike shunt references whose current scales with VIN - maximizes battery efficiency in devices powered from variable sources like harvested energy or aging alkaline cells.
Can MAX6191BESA+T be used in applications requiring a negative reference voltage?
MAX6191BESA+T itself provides only a positive 2.048V output. However, it can serve as the positive reference in bipolar reference circuits - for example, paired with a charge-pump inverter (e.g., MAX681) and precision op-amp (e.g., ICL7652) to generate matched ±2.048V rails. The low noise and high PSRR of MAX6191BESA+T directly benefit the quality of the derived negative reference.
What is the long-term stability specification for MAX6191BESA+T?
MAX6191BESA+T guarantees ≤50ppm drift over 1000 hours of operation at +25°C, equivalent to ≤0.102mV change in 2.048V output. This long-term stability - combined with ≤75ppm temperature hysteresis - ensures repeatable calibration in field-deployed equipment such as handheld calibrators and portable gas analyzers where recalibration intervals exceed six months.
MAX6191BESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 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+T FAQ
1.How can I place an order for MAX6191BESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6191BESA+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 MAX6191BESA+T reliable?
The price and inventory of MAX6191BESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6191BESA+T is usually 5 days.
3.What payment methods are accepted for MAX6191BESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6191BESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6191BESA+T?
MAX6191BESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6191BESA+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 MAX6191BESA+T?
For technical support, including MAX6191BESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6191BESA+T requirements.
6.How does Aetrix verify that MAX6191BESA+T is sourced from the original manufacturer or authorized distributors?
All MAX6191BESA+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 MAX6191BESA+T meets industry standards.
7.What is the process for return or replacement of MAX6191BESA+T?
All MAX6191BESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6191BESA+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 MAX6191BESA+T part is unused and in its original packaging.
Return procedure for MAX6191BESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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