My Inquiry
My Account
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:2,934
Please send an inquiry. Send us your inquiry, and we will respond immediately.
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, 5ppm/°C max temperature coefficient, and 35µA max quiescent current - ideal for high-accuracy ADC/DAC biasing in battery-powered handheld instruments.
For engineers reviewing the MAX6191AESA datasheet, MAX6191AESA pinout, MAX6191AESA application, or MAX6191AESA equivalent, this page provides verified specifications, SO-8 package details, load-regulation behavior at ±500µA, dropout performance (100mV at 500µA), and real-world design implications for precision analog systems.
Technical Context
The MAX6191AESA uses a proprietary curvature-correction circuit and laser-trimmed thin-film resistors to achieve <5ppm/°C temperature coefficient and ±2mV (±0.098%) initial accuracy over –40°C to +85°C. It operates as a series-mode reference, sourcing and sinking up to ±500µA while maintaining stability with capacitive loads up to 2.2nF.
Its supply current remains virtually immune to input voltage variation (0.8–2µA/V change across VIN), and it achieves 0.12µV/µA load regulation and 10µV/V line regulation - enabling high-precision operation in low-noise, low-power signal chains where reference drift directly impacts measurement fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±2mV (±0.098%) - enables exact 12-bit full-scale alignment with common SAR ADCs using VREF = VDD/2 or binary-weighted scaling. |
| Temp Coefficient | ≤5ppm/°C - ensures ≤±0.42mV drift over –40°C to +85°C, critical for industrial process control calibration stability. |
| Quiescent Current | ≤35µA - supports >10-year battery life in portable multimeters and sensor transmitters operating at 50µA average system current. |
| Dropout Voltage | 100mV at 500µA load - allows operation from 2.148V supply, compatible with single-cell LiFePO₄ or dual-cell alkaline systems. |
| Load Regulation | 0.12µV/µA - guarantees <60µV output shift across full ±500µA load range, preserving 16-bit monotonicity in precision DAC buffers. |
| Noise (0.1–10Hz) | 105µVRMS - contributes <0.05 LSB error in 16-bit, 2.048V-FS systems, limiting achievable effective resolution without external filtering. |
| Capacitive Load Stability | 0–2.2nF - eliminates need for output capacitor in space-constrained designs, reducing BOM count and PCB area in portable medical sensors. |
Pinout & Package
MAX6191AESA is housed in an 8-pin SO (Small Outline) package with RoHS-compliant lead finish. Pins 1, 3, 5, 7, and 8 are No Connect (N.C.) and must remain unconnected. Pin 4 is GND, Pin 2 is IN (supply input), and Pin 6 is OUT (2.048V reference output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 8 | No Connection (N.C.) | Not internally bonded - must be left floating; no routing or thermal relief required. |
| 2 | IN | Supply input (2.5V to 12.6V); requires local 100nF ceramic decoupling within 5mm of pin. |
| 4 | GND | Analog ground reference; must connect to clean, low-impedance ground plane with dedicated via. |
| 6 | OUT | 2.048V precision reference output; drives ADC REF+, DAC VREF, or op-amp gain-setting networks. |
Key Features
| Feature | Design Value |
|---|---|
| Initial Accuracy | ±2mV (±0.098%) - eliminates factory calibration for mid-tier instrumentation requiring 12-bit absolute accuracy. |
| Temperature Coefficient | ≤5ppm/°C - reduces thermal drift contribution to <±0.5 LSB in 16-bit systems over full industrial temperature range. |
| Supply Current Stability | 0.8–2µA/V VIN dependence - enables stable reference performance across wide input rails (e.g., 3.3V–12V) without dynamic current compensation. |
| Capacitive Load Tolerance | 0–2.2nF - supports direct connection to ADC input capacitance or long traces without oscillation risk. |
| Turn-On Settling Time | 30µs to 0.1% - meets fast-sampling requirements in automated test equipment with ≥33kHz conversion rates. |
Applications
| Hand-Held Multimeters | Analog-to-Digital Converters |
|---|---|
Use Scenario: Portable 4½-digit DMM measuring DC voltage with auto-ranging and battery operation. IC Role / Device Role / Timing Role: Primary voltage reference for dual-slope or sigma-delta ADC, setting absolute measurement accuracy. Use Value: ±2mV initial accuracy and 5ppm/°C TC ensure calibrated accuracy holds over battery discharge and ambient temperature shifts without recalibration. |
Use Scenario: 16-bit SAR ADC in industrial data acquisition module sampling sensor signals at 100kSPS. IC Role / Device Role / Timing Role: Stable VREF source for ADC reference input, directly determining full-scale range and LSB size. Use Value: 0.12µV/µA load regulation prevents code-dependent offset errors during fast switching of internal ADC sampling capacitors. |
| Digital-to-Analog Converters | Precision 3V/5V Systems |
Use Scenario: Programmable current source for 4–20mA loop transmitter using 16-bit DAC and op-amp I/V conversion. IC Role / Device Role / Timing Role: Reference voltage for DAC's internal resistor ladder or external gain-setting network. Use Value: Low 35µA supply current minimizes total system power, extending loop-powered device runtime while maintaining 12-bit monotonicity. |
Use Scenario: Reference for voltage supervisors, ADCs, and comparators in a 3.3V FPGA-based embedded controller. IC Role / Device Role / Timing Role: Precision bias source ensuring consistent trip points and analog measurement across mixed-voltage subsystems. Use Value: 100mV dropout enables operation from 3.3V rail with margin for ripple, avoiding need for dedicated LDO and reducing component count. |
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, ±1.5mV initial accuracy, 3ppm/°C TC, 12µA quiescent current, SOT-23-5 package. | Lower supply current but higher cost; requires different PCB footprint and lacks SO-8 thermal mass for high-reliability industrial use. | Select when ultra-low power (<15µA) dominates over board-level robustness and legacy SO-8 compatibility. |
| REF3020AIDBZR | 2.048V output, ±2mV initial accuracy, 50ppm/°C TC, 40µA quiescent current, SOT-23-3 package. | Higher temperature coefficient limits use to commercial-grade applications; smaller package increases layout sensitivity to thermal gradients. | Select only for cost-sensitive consumer applications where ±50ppm/°C drift is acceptable and space constraints prohibit SO-8. |
Compared with ADR3420ARJZ-R7 and REF3020AIDBZR, MAX6191AESA offers superior thermal stability (5ppm/°C vs. 3ppm/°C or 50ppm/°C) and proven SO-8 reliability in industrial environments, while maintaining identical 2.048V output and ±2mV accuracy - making it optimal for field-deployed instrumentation requiring long-term calibration retention.
Availability
MAX6191AESA is available at Aetrix Electronics and suitable for hand-held instruments, analog-to-digital converters, industrial process control systems requiring stable component supply with guaranteed long-term availability and traceable lot history.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX6190–MAX6195/MAX6198 family was designed specifically for precision, micropower, low-dropout voltage reference applications - targeting battery-operated test equipment, high-resolution data converters, and space-constrained industrial sensors where accuracy, stability, and efficiency are co-critical.
FAQ
What is the maximum load current supported by MAX6191AESA?
MAX6191AESA sources and sinks up to ±500µA while maintaining specified accuracy and stability. At 500µA load, dropout voltage is guaranteed ≤100mV, and load regulation is 0.12µV/µA - meaning output changes by no more than 60µV across the full load range. This capability supports direct driving of ADC reference inputs and op-amp bias networks without external buffering.
Does MAX6191AESA require an output capacitor for stability?
No, MAX6191AESA is internally compensated and stable with capacitive loads from 0 to 2.2nF. An output capacitor is optional and only recommended in applications subject to rapid load or supply transients - such as multiplexed sensor arrays - where it reduces overshoot and improves transient response. In space-constrained designs like portable medical devices, omitting the capacitor reduces BOM count and PCB area without compromising stability.
What is the supply voltage range for MAX6191AESA?
MAX6191AESA operates from 2.5V to 12.6V input. Its minimum supply voltage is VIN ≥ (VOUT + 0.2V) = 2.248V, but the datasheet specifies 2.5V as the guaranteed lower limit for full parameter compliance. At 500µA load, dropout is 100mV - so 2.148V is the theoretical minimum, though 2.5V ensures guaranteed performance across temperature and process variation.
How does MAX6191AESA compare to MAX6191BESA and MAX6191CESA?
MAX6191AESA offers ±2mV initial accuracy and ≤5ppm/°C temperature coefficient; MAX6191BESA provides ±5mV/≤10ppm/°C; MAX6191CESA provides ±10mV/≤25ppm/°C. All share identical pinout, SO-8 package, 35µA max supply current, and 100mV dropout. The 'A' grade is selected for highest-accuracy applications like metrology-grade DMMs, while 'B' and 'C' grades serve cost-sensitive or less demanding industrial controls.
Is MAX6191AESA RoHS-compliant and lead-free?
Yes, MAX6191AESA+ (the orderable part number shown in the datasheet) denotes a lead(Pb)-free and RoHS-compliant package. The '+' suffix confirms compliance with EU RoHS Directive 2011/65/EU and related restrictions on hazardous substances. No lead content is present in the terminations or die attach materials.
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:
- Obsolete
- 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.
MAX6191AESA Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
