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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Analog Devices Inc./Maxim Integrated MAX6126B21+T

Name: MAX6126B21+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6126B21+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6126B21+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Voltage Reference

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: MAX6126B21+T.pdf

Description:: IC VREF SERIES 0.1% 8UMAX

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Product details

Overview

MAX6126B21+T from Maxim Integrated is a precision series voltage reference delivering 2.048V output with ±0.06% initial accuracy, 5ppm/°C max temperature coefficient (−40°C to +125°C), and ultra-low 1.3μV_P-P (0.1Hz–10Hz) noise-enabling high-resolution ADC/DAC biasing in automotive-grade test equipment and industrial control systems.

For engineers reviewing the MAX6126B21+T datasheet, MAX6126B21+T pinout, MAX6126B21+T application, or MAX6126B21+T equivalent, key selection criteria include force/sense output architecture for remote sensing, 200mV dropout at 10mA load, stability with 0.1–10μF capacitive loads, and AEC-Q200-qualified operation across −40°C to +125°C.

Technical Context

The MAX6126B21+T employs curvature-corrected bandgap topology with laser-trimmed thin-film resistors to achieve 5ppm/°C tempco over full automotive range. Its dual-output (OUTF/OUTS) Kelvin configuration actively compensates for PCB trace resistance in precision current sources and high-accuracy metering.

Wideband noise is reduced from 60nV/√Hz to 35nV/√Hz via external 0.1μF capacitor on NR pin, while supply current remains stable at 380μA (±2μA/V line regulation) across 2.7–12.6V input-eliminating need for external current-setting resistors unlike shunt references.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.048V ±0.06% at +25°C - matches common 12-bit DAC/ADC full-scale scaling.
Tempco	5ppm/°C max (−40°C to +125°C) - ensures ≤0.6mV drift over full automotive range.
Noise (0.1–10Hz)	1.3μV_P-P - enables <18-bit ENOB in precision data acquisition systems.
Dropout Voltage	200mV max at 10mA - supports operation from low-voltage rails like 2.3V LDO outputs.
Load Regulation	25μV/mA max - maintains accuracy under dynamic load changes in active filter biasing.
Supply Current	380μA typical - minimizes power budget impact in battery-backed instrumentation.
Capacitive Load Range	0.1–10μF - accommodates ceramic or tantalum bypass without oscillation risk.

Pinout & Package

MAX6126B21+T is housed in an 8-pin μMAX package (2.1mm × 1.6mm, 0.5mm pitch), optimized for space-constrained automotive modules and portable test gear.

Pin/Terminal	Circuit Role	Design Meaning
1 NR	Noise Reduction Input	Accepts 0.1μF capacitor to reduce wideband noise from 60nV/√Hz to 35nV/√Hz; left open if unused.
2 IN	Positive Supply Input	Operates from 2.7V to 12.6V; supplies internal reference core and output stage.
3 GND	Power Ground	Reference ground return for internal circuitry; separate from GNDS to enable Kelvin sensing.
4 GNDS	Ground Sense	Connects to load-side ground point to cancel PCB trace resistance in remote-sensing configurations.
5, 8 I.C.	Internally Connected	No external connection permitted; internal tie points for die routing.
6 OUTS	Voltage Sense Output	Provides feedback path to regulate OUTF; connects directly to load's reference node for precision.
7 OUTF	Voltage Force Output	Delivers regulated 2.048V current to load; shorted to OUTS near load to complete Kelvin loop.

Key Features

Feature	Design Value
Force/Sense Outputs	Enables true 4-wire remote sensing to eliminate voltage drop errors in long PCB traces or cables.
Ultra-Low Flicker Noise	1.3μV_P-P (0.1–10Hz) supports sub-20-bit resolution in DC-coupled measurement front-ends.
Low Dropout	200mV at 10mA allows use with low-headroom supplies such as 2.3V LDOs in automotive ECUs.
Stable with Wide C_LOAD	Guaranteed stability from 0.1μF to 10μF eliminates need for complex compensation networks.
Automotive Temperature Range	Qualified for −40°C to +125°C operation per AEC-Q200 requirements for engine bay sensors.

Applications

High-Resolution Data Acquisition	Precision Current Sources
Use Scenario: 24-bit sigma-delta ADC front-end in portable digital multimeter requiring stable 2.048V reference for full-scale calibration. IC Role / Device Role / Timing Role: Primary voltage reference establishing absolute scale for analog-to-digital conversion. Use Value: ±0.06% initial accuracy and 5ppm/°C tempco ensure <0.01% total error over temperature, meeting Class 0.1 meter standards.	Use Scenario: Programmable 4–20mA transmitter in industrial process control loop with 0.1% output tolerance. IC Role / Device Role / Timing Role: Precision current-setting reference for op-amp-based Howland current source. Use Value: Force/sense outputs compensate for 100mΩ PCB trace resistance, maintaining current accuracy despite layout variations.
Automotive Test Equipment	Digital Voltmeters
Use Scenario: On-board diagnostics (OBD-II) calibration fixture verifying sensor signal conditioning circuits across −40°C to +125°C. IC Role / Device Role / Timing Role: Reference standard for automated test system measuring ECU analog inputs. Use Value: 20ppm/1000hr long-term stability ensures calibration validity over 6-month production intervals without recalibration.	Use Scenario: Benchtop 6½-digit DVM requiring ultra-low-noise reference for sub-microvolt measurements. IC Role / Device Role / Timing Role: Low-noise voltage reference for integrating ADC reference input and internal DAC calibration. Use Value: 1.3μV_P-P flicker noise and 35nV/√Hz wideband noise enable 0.1μV resolution in 10-second integration windows.

High-Resolution Data Acquisition

Precision Current Sources

Use Scenario: 24-bit sigma-delta ADC front-end in portable digital multimeter requiring stable 2.048V reference for full-scale calibration.

IC Role / Device Role / Timing Role: Primary voltage reference establishing absolute scale for analog-to-digital conversion.

Use Value: ±0.06% initial accuracy and 5ppm/°C tempco ensure <0.01% total error over temperature, meeting Class 0.1 meter standards.

Use Scenario: Programmable 4–20mA transmitter in industrial process control loop with 0.1% output tolerance.

IC Role / Device Role / Timing Role: Precision current-setting reference for op-amp-based Howland current source.

Use Value: Force/sense outputs compensate for 100mΩ PCB trace resistance, maintaining current accuracy despite layout variations.

Automotive Test Equipment

Digital Voltmeters

Use Scenario: On-board diagnostics (OBD-II) calibration fixture verifying sensor signal conditioning circuits across −40°C to +125°C.

IC Role / Device Role / Timing Role: Reference standard for automated test system measuring ECU analog inputs.

Use Value: 20ppm/1000hr long-term stability ensures calibration validity over 6-month production intervals without recalibration.

Use Scenario: Benchtop 6½-digit DVM requiring ultra-low-noise reference for sub-microvolt measurements.

IC Role / Device Role / Timing Role: Low-noise voltage reference for integrating ADC reference input and internal DAC calibration.

Use Value: 1.3μV_P-P flicker noise and 35nV/√Hz wideband noise enable 0.1μV resolution in 10-second integration windows.

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
REF5020IDR	2.048V output, ±0.05% initial accuracy, 3ppm/°C tempco, but requires 3.3V min supply and lacks force/sense outputs.	Suitable for fixed-rail systems without remote sensing needs; not rated for automotive temperature range.	Select when highest initial accuracy is prioritized over thermal performance and Kelvin connectivity.
ADR4520BRZ	2.048V output, ±0.02% initial accuracy, 2ppm/°C tempco, 1.2μV_P-P noise, but 4.5V min supply and no NR pin for noise reduction.	Better noise/tempco specs but incompatible with low-voltage automotive rails; no programmable noise filtering.	Choose for lab-grade instrumentation where supply headroom exceeds 4.5V and ultimate stability is critical.

Compared with REF5020IDR and ADR4520BRZ, the MAX6126B21+T uniquely combines automotive temperature rating, force/sense architecture, and configurable noise reduction-making it optimal for embedded systems requiring robustness, layout flexibility, and supply voltage scalability.

Availability

MAX6126B21+T is available at Aetrix Electronics and suitable for high-accuracy industrial process control, automotive diagnostic equipment, and portable precision instrumentation requiring stable component supply across extended temperature ranges.

Supply support for MAX6126B21+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 demanding industrial, automotive, and communications applications.

The MAX6126 family delivers ultra-precision voltage references with integrated noise reduction and Kelvin sensing-engineered specifically for metrology-grade data acquisition, automotive test systems, and high-reliability embedded instrumentation.

FAQ

What is the maximum operating temperature range for the MAX6126B21+T?

The MAX6126B21+T is qualified for continuous operation from −40°C to +125°C, meeting AEC-Q200 requirements for automotive under-hood applications. This full-range specification is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section for the B-grade µMAX variant.

Does the MAX6126B21+T require an external resistor for biasing?

No, the MAX6126B21+T is a series-mode voltage reference with internally regulated current source. It draws a stable 380μA quiescent supply current independent of input voltage-eliminating the need for external current-setting resistors required by shunt-mode references.

How does the force/sense architecture of the MAX6126B21+T improve accuracy?

The MAX6126B21+T uses separate OUTF (force) and OUTS (sense) pins to implement Kelvin sensing. By routing OUTF to the load and returning OUTS to the precise measurement point, voltage drops across PCB traces or connectors are excluded from regulation-maintaining 2.048V accuracy at the load regardless of interconnect resistance.

Can the MAX6126B21+T drive a 10μF output capacitor?

Yes, the MAX6126B21+T is explicitly characterized for stable operation with output capacitance from 0.1μF to 10μF. The datasheet confirms no sustained oscillations across this full range, enabling use of bulk ceramic/tantalum combinations for transient suppression in noisy environments.

What is the purpose of the NR pin on the MAX6126B21+T?

The NR (Noise Reduction) pin on the MAX6126B21+T accepts an external 0.1μF capacitor to reduce wideband noise from 60nV/√Hz to 35nV/√Hz at 1kHz. It also lowers 0.1–10Hz flicker noise to 0.9μV_P-P, making it essential for high-resolution DC measurements where low-frequency noise dominates error budgets.

MAX6126B21+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:: 10 mA

Tolerance:: ±0.1%

Temperature Coefficient:: 12ppm/°C

Noise - 0.1Hz to 10Hz:: 1.3µVp-p

Noise - 10Hz to 10kHz:: -

Voltage - Input:: 2.7V ~ 12.6V

Current - Supply:: 725µA

Current - Cathode:: -

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-uMAX/uSOP

MAX6126B21+T FAQ

1.How can I place an order for MAX6126B21+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6126B21+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 MAX6126B21+T reliable?

The price and inventory of MAX6126B21+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6126B21+T is usually 5 days.

3.What payment methods are accepted for MAX6126B21+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6126B21+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6126B21+T?

MAX6126B21+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6126B21+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 MAX6126B21+T?

For technical support, including MAX6126B21+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6126B21+T requirements.

6.How does Aetrix verify that MAX6126B21+T is sourced from the original manufacturer or authorized distributors?

All MAX6126B21+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 MAX6126B21+T meets industry standards.

7.What is the process for return or replacement of MAX6126B21+T?

All MAX6126B21+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6126B21+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 MAX6126B21+T part is unused and in its original packaging.

Return procedure for MAX6126B21+T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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