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Analog Devices Inc./Maxim Integrated MAX6191AESA+T
- Part No.:
- MAX6191AESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6191AESA+T.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,301
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Product details
Overview
MAX6191AESA+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 - ideal for high-accuracy ADC/DAC biasing in portable instrumentation and industrial sensor signal chains.
For engineers reviewing the MAX6191AESA+T datasheet, MAX6191AESA+T pinout, MAX6191AESA+T application, or MAX6191AESA+T equivalent, this page provides verified electrical specifications, SO-8 package layout, load-regulation behavior under 500µA sourcing/sinking, dropout performance at 100mV, and real-world alternatives for precision analog design.
Technical Context
This device uses a curvature-corrected bandgap core with laser-trimmed thin-film resistors to achieve <5ppm/°C temperature drift and ±2mV initial tolerance. It operates as a series-mode reference, enabling bidirectional 500µA load current capability (source and sink) without external compensation.
Internally compensated for stability with capacitive loads up to 2.2nF, it achieves 30µs turn-on settling to 0.1% and maintains 84dB ripple rejection at 120Hz - critical for noise-sensitive data acquisition systems powered from noisy DC-DC converters or battery supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±2mV (±0.098% initial error; enables direct interface with 12-bit SAR ADCs requiring precise VREF) |
| Temp Coefficient | ≤5ppm/°C max (output drift ≤103µV over -40°C to +85°C; supports industrial-grade measurement stability) |
| Quiescent Current | ≤35µA max (enables >1-year battery life in 10µA-sleep IoT sensors; supply-current variation <2µA/V) |
| Dropout Voltage | 100mV at 500µA load (supports operation from 2.148V input; suitable for single-cell LiFePO₄ or dual-cell alkaline systems) |
| Load Regulation | 0.12µV/µA (ΔVOUT ≤60µV across full 500µA sourcing range; preserves LSB integrity in 16-bit DAC references) |
| Line Regulation | 10µV/V (input ripple rejection maintains reference accuracy even with ±100mV VIN variation) |
| Noise (0.1–10Hz) | 105µVRMS (low-frequency noise compatible with precision weigh-scale and strain-gauge front-ends) |
Pinout & Package
MAX6191AESA+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 1,3,5,7,8 are No Connect (N.C.).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 8 | N.C. | No internal connection; must remain unconnected on PCB to avoid parasitic coupling or ESD path disruption |
| 2 | IN | Supply input terminal; accepts 2.5V to 12.6V; requires local 100nF ceramic decoupling near pin |
| 4 | GND | Analog ground reference; must tie directly to clean system AGND plane with low-inductance path |
| 6 | OUT | Precision 2.048V reference output; capable of sourcing/sinking ±500µA while maintaining regulation |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-Corrected Bandgap | Enables ≤5ppm/°C tempco without external trimming - reduces calibration cost in production test |
| Laser-Trimmed Thin-Film Resistors | Guarantees ±2mV initial accuracy at 25°C - eliminates need for post-assembly VREF adjustment |
| Capacitive-Load Stability | Stable with 0–2.2nF output capacitance - allows optional bypass cap for transient suppression without oscillation risk |
| Bidirectional Load Capability | Sinks and sources up to 500µA - supports active filtering, reference buffering, and dual-supply bias networks |
| Low 10Hz–10kHz Noise | 105µVRMS - meets SNR requirements for 16-bit delta-sigma ADCs in precision data loggers |
Applications
| Hand-Held Multimeters | Analog-to-Digital Converters |
|---|---|
Use Scenario: Portable 4½-digit DMM measuring mV-range thermocouple signals with auto-ranging. IC Role / Device Role / Timing Role: Primary voltage reference for dual-slope integrator and ADC front-end. Use Value: ±2mV initial accuracy and 5ppm/°C tempco ensure <0.01% reading stability across field operating temperatures without recalibration. |
Use Scenario: 16-bit SAR ADC in programmable logic controller (PLC) analog input module. IC Role / Device Role / Timing Role: Precision VREF source for ADC conversion reference rail. Use Value: 0.12µV/µA load regulation prevents code errors during dynamic channel switching with varying input buffer currents. |
| Industrial Process Transmitters | Precision 3V/5V Systems |
Use Scenario: 4–20mA loop-powered pressure transmitter with HART digital overlay. IC Role / Device Role / Timing Role: Stable excitation reference for bridge sensor and ADC reference. Use Value: 35µA quiescent current enables full functionality within 3.5mA loop budget while maintaining 2.048V accuracy. |
Use Scenario: Reference for 3.3V microcontroller ADC and analog comparators in battery-backed data logger. IC Role / Device Role / Timing Role: Low-power, high-stability voltage reference for mixed-signal SoC peripherals. Use Value: 100mV dropout allows operation from aged 3.4V Li-ion cell while sustaining 2.048V output within ±0.05%. |
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 typical IQ, SOT-23-5 package | Lower quiescent current but higher tempco; not stable with >1nF load capacitance | Select when ultra-low power dominates over tempco; verify layout for SOT-23 thermal drift impact |
| REF3020AIDBZR | 2.048V output, ±2mV initial accuracy, 50ppm/°C max tempco, 40µA max IQ, SOT-23-3 package | Higher tempco limits use to commercial-temp applications; no sink capability (source-only) | Acceptable only for cost-sensitive consumer designs where ±0.1% total error budget permits 50ppm/°C drift |
Compared with ADR3420ARJZ-R7 and REF3020AIDBZR, MAX6191AESA+T delivers superior temperature stability and bidirectional load support in SO-8 - essential for industrial-grade measurement systems requiring guaranteed 0.01% accuracy over full temperature range.
Availability
MAX6191AESA+T is available at Aetrix Electronics and suitable for hand-held instruments, analog-to-digital converters, and industrial process control requiring stable component supply with full traceability and long-term lifecycle assurance.
Supply support for MAX6191AESA+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 high-performance analog and mixed-signal ICs for precision, power, and interface applications.
The MAX6190–MAX6195/MAX6198 family was engineered specifically for micropower, high-accuracy voltage referencing in battery-operated and space-constrained instrumentation - emphasizing low tempco, minimal dropout, and robust capacitive-load stability.
FAQ
What is the maximum load current supported by MAX6191AESA+T?
MAX6191AESA+T supports sourcing and sinking up to ±500µA while maintaining regulation and specified accuracy. At 500µA load, dropout is guaranteed ≤100mV, and load regulation is 0.12µV/µA - meaning output voltage changes by no more than 60µV across the full load range. This bidirectional capability enables use in active filter biasing and reference buffering circuits where current flows both into and out of the reference node.
Does MAX6191AESA+T require an output capacitor for stability?
No, MAX6191AESA+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 - it does not affect loop stability. This eliminates mandatory board area for decoupling and simplifies layout in space-constrained portable designs.
What is the supply voltage range for reliable operation of MAX6191AESA+T?
MAX6191AESA+T operates reliably from VIN = 2.5V to 12.6V. For 2.048V output, minimum input is VOUT + 0.2V = 2.248V, but datasheet guarantees specify 2.5V minimum to ensure full parametric performance across temperature. Dropout is 100mV at 500µA, so 2.148V input sustains regulation - however, operation below 2.5V is not characterized and may degrade tempco or noise performance.
How does MAX6191AESA+T compare to shunt voltage references in battery-powered systems?
Unlike shunt references that draw constant current regardless of load, MAX6191AESA+T draws only 35µA quiescent current plus actual load current - maximizing battery life. Its series architecture avoids the series resistor required by shunt devices, eliminating wasted power and enabling efficient operation from variable or low-input supplies like aging batteries or DC-DC outputs.
Is MAX6191AESA+T 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.), and footprint. MAX6191AESA+T can be substituted with MAX6192AESA+T (2.5V), MAX6193AESA+T (3.0V), or MAX6194AESA+T (4.5V) without PCB changes - provided the system's voltage headroom and accuracy requirements align with the alternate output voltage and its respective initial tolerance and tempco.
MAX6191AESA+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:
- ±0.1%
- 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+T FAQ
1.How can I place an order for MAX6191AESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6191AESA+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 MAX6191AESA+T reliable?
The price and inventory of MAX6191AESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6191AESA+T is usually 5 days.
3.What payment methods are accepted for MAX6191AESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6191AESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6191AESA+T?
MAX6191AESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6191AESA+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 MAX6191AESA+T?
For technical support, including MAX6191AESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6191AESA+T requirements.
6.How does Aetrix verify that MAX6191AESA+T is sourced from the original manufacturer or authorized distributors?
All MAX6191AESA+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 MAX6191AESA+T meets industry standards.
7.What is the process for return or replacement of MAX6191AESA+T?
All MAX6191AESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6191AESA+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 MAX6191AESA+T part is unused and in its original packaging.
Return procedure for MAX6191AESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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