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Analog Devices Inc./Maxim Integrated MAX6191AESA+
- Part No.:
- MAX6191AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6191AESA+.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:568
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Product details
Overview
MAX6191AESA+ from Maxim Integrated is a precision, micropower, low-dropout series-mode bandgap voltage reference delivering 2.048V output with ±2mV initial accuracy, 4ppm/°C max temperature coefficient, and 35µA max quiescent current - designed for high-accuracy ADC/DAC biasing in battery-powered instrumentation.
For engineers reviewing the MAX6191AESA+ datasheet, MAX6191AESA+ pinout, MAX6191AESA+ application, or MAX6191AESA+ equivalent, this page provides verified specifications, SO-8 package layout, load-regulation behavior at 500µA, dropout performance down to 100mV, and real-world alternatives for precision analog signal chains.
Technical Context
The MAX6191AESA+ uses a proprietary curvature-correction circuit and laser-trimmed thin-film resistors to achieve <5ppm/°C temperature coefficient and ±0.1% initial accuracy. It operates as a series-mode reference capable of sourcing and sinking up to ±500µA while maintaining stability with capacitive loads from 0 to 2.2nF.
Its supply current remains virtually immune to input voltage variation (0.8µA/V drift), and it features internal compensation for fast settling (30µs to 0.1% with 50pF load). Dropout voltage is specified at 100mV under 500µA load, enabling operation from low-voltage rails such as 2.5V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±2mV (±0.1% tolerance) - enables direct interface with 12-bit SAR ADCs without gain calibration |
| Temp Coefficient | 4ppm/°C max - ensures ≤0.8mV drift over -40°C to +85°C industrial range |
| Quiescent Current | 35µA max - supports >10-year battery life in 10µA-average-power handheld meters |
| Dropout Voltage | 100mV at 500µA load - allows operation from 2.148V minimum input in 2.5V systems |
| Load Regulation | 0.12µV/µA - contributes <60µV error across full ±500µA load range |
| Line Regulation | 10µV/V - adds <126µV error over 2.5V–12.6V input range |
| Noise (0.1–10Hz) | 105µVRMS - suitable for 16-bit precision measurement front-ends |
Pinout & Package
MAX6191AESA+ 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 | OUT | Reference voltage output - connects directly to ADC REF+ or op-amp noninverting input |
| 2 | IN | Supply input - accepts 2.5V to 12.6V; must deliver up to 200µA during turn-on |
| 4 | GND | Analog ground reference - requires low-impedance connection to system AGND plane |
| 3, 5, 7, 8 | N.C. | No internal connection - may be left floating or tied to GND for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-corrected bandgap core | Enables 4ppm/°C tempco without external trimming components |
| Laser-trimmed thin-film resistors | Guarantees ±2mV initial accuracy without post-package calibration |
| Capacitive-load stability (0–2.2nF) | Eliminates need for output capacitor in space-constrained PCB layouts |
| Internal compensation | Ensures stable operation with no external compensation network required |
| Bidirectional load capability (±500µA) | Supports both sourcing and sinking - ideal for ratiometric DAC feedback paths |
Applications
| Hand-Held Multimeters | Analog Front-Ends for 12–16-bit ADCs |
|---|---|
Use Scenario: Portable 4½-digit DMM requiring stable 2.048V reference for dual-slope integration. IC Role / Device Role / Timing Role: Primary voltage reference for integrator and comparator stages. Use Value: 4ppm/°C tempco prevents calibration drift during field use across ambient temperatures. |
Use Scenario: Precision sensor signal conditioning with 16-bit SAR ADC (e.g., ADS8860). IC Role / Device Role / Timing Role: Reference source for ADC VREF pin and PGA gain-setting resistors. Use Value: 0.12µV/µA load regulation ensures <60µV error even with dynamic PGA current draw. |
| Industrial Loop-Powered Transmitters | Low-Power Data Acquisition Modules |
Use Scenario: 4–20mA transmitter with microcontroller-based signal processing and HART modulation. IC Role / Device Role / Timing Role: Stable excitation reference for RTD/thermocouple bridges and ADC reference. Use Value: 35µA quiescent current minimizes burden on 4mA loop power budget. |
Use Scenario: Battery-operated environmental monitor sampling temperature/humidity at 1SPS. IC Role / Device Role / Timing Role: Low-noise, low-drift reference for successive-approximation ADC conversion cycles. Use Value: 105µVRMS (0.1–10Hz) noise floor preserves effective resolution in sub-10µV measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3420ARJZ-R7 | 2.048V output, ±2mV initial accuracy, 10ppm/°C max tempco, 12µA quiescent current, SOT-23-5 package | Lower supply current but higher tempco; smaller footprint but lower load drive (±10mA) | Preferred where ultra-low power dominates over tempco; requires redesign for SO-8 footprint |
| REF3020AIDBZR | 2.048V output, ±2mV initial accuracy, 50ppm/°C max tempco, 40µA quiescent current, SOT-23-3 package | Higher tempco limits use to narrow-temp environments; simpler 3-pin layout but no sink capability | Acceptable for cost-sensitive consumer-grade instruments with <10°C operating range |
Compared with ADR3420ARJZ-R7 and REF3020AIDBZR, MAX6191AESA+ delivers superior thermal stability (4ppm/°C vs. 10ppm/°C and 50ppm/°C) and bidirectional load support - critical for ratiometric sensor interfaces and industrial-grade calibration retention.
Availability
MAX6191AESA+ is available at Aetrix Electronics and suitable for hand-held instrumentation, precision data acquisition, and industrial process control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6191AESA+ 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.
The MAX6190–MAX6195/MAX6198 family was engineered specifically for micropower, low-dropout voltage references in battery-operated and space-constrained precision measurement systems.
FAQ
What is the maximum load current the MAX6191AESA+ can source or sink?
The MAX6191AESA+ is guaranteed to source and sink up to ±500µA while maintaining specified accuracy and dropout voltage. At 500µA load, dropout is 100mV, and load regulation contributes only 60µV error. This bidirectional capability supports ratiometric DAC configurations and active filter biasing where current flows into or out of the reference node.
Does the MAX6191AESA+ require an output capacitor for stability?
No, the MAX6191AESA+ is internally compensated and stable with capacitive loads from 0 to 2.2nF. An external capacitor is optional and used only to improve transient response during step-load changes - not for stability. This eliminates board area and BOM cost in compact designs like portable meters and sensor nodes.
What is the minimum input voltage required for the MAX6191AESA+ to regulate at full load?
The minimum input voltage for the MAX6191AESA+ is VOUT + 0.1V = 2.148V at 500µA load, per the 100mV dropout specification. The device remains functional down to 2.5V input across its full temperature range, but dropout increases slightly at extremes - e.g., 120mV at -40°C/500µA. Input must exceed 2.5V to guarantee all specs.
How does the MAX6191AESA+ compare to shunt references in battery-powered applications?
Unlike shunt references, the MAX6191AESA+ draws only 35µA quiescent current - independent of load - because it's a series-mode device. Shunt references require a series resistor sized for worst-case load, wasting current continuously. This gives MAX6191AESA+ up to 3× longer battery life in intermittent-use instruments like handheld calibrators.
Is the MAX6191AESA+ pin-compatible with other devices in the MAX6190–MAX6195 family?
Yes, all MAX6190–MAX6195/MAX6198 variants share identical 8-pin SO package pinout (IN, GND, OUT, N.C.), enabling drop-in replacement across output voltages (1.25V to 5.0V) and accuracy grades (A/B/C). The MAX6191AESA+ can be substituted with MAX6192AESA+ or MAX6193AESA+ without layout change - only firmware or calibration adjustment needed for different VOUT.
MAX6191AESA+ 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:
- ±0.1%
- Temperature Coefficient:
- 5ppm/°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
MAX6191AESA+ FAQ
1.How can I place an order for MAX6191AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6191AESA+ 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 MAX6191AESA+ reliable?
The price and inventory of MAX6191AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6191AESA+ is usually 5 days.
3.What payment methods are accepted for MAX6191AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6191AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6191AESA+?
MAX6191AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6191AESA+ 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 MAX6191AESA+?
For technical support, including MAX6191AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6191AESA+ requirements.
6.How does Aetrix verify that MAX6191AESA+ is sourced from the original manufacturer or authorized distributors?
All MAX6191AESA+ 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 MAX6191AESA+ meets industry standards.
7.What is the process for return or replacement of MAX6191AESA+?
All MAX6191AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6191AESA+, 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 MAX6191AESA+ part is unused and in its original packaging.
Return procedure for MAX6191AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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