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Analog Devices Inc./Maxim Integrated MAX6126B25+T
- Part No.:
- MAX6126B25+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6126B25+T.pdf
- Description:
- IC VREF SERIES 0.1% 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,520
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Product details
Overview
MAX6126B25+T from Maxim Integrated is a B-grade, 2.500V ultra-low-noise, high-precision series voltage reference with ±0.06% initial accuracy, 5ppm/°C max temperature coefficient (−40°C to +125°C), and 75nV/√Hz wideband noise (1kHz, no NR cap). It delivers 10mA sink/source capability in an 8-pin SO package and is used in high-resolution ADCs requiring stable, low-drift reference voltage under automotive-grade thermal stress.
For engineers reviewing the MAX6126B25+T datasheet, MAX6126B25+T pinout, MAX6126B25+T application, or MAX6126B25+T equivalent, key selection criteria include its force/sense output architecture for remote sensing, 0.1μF–10μF capacitive-load stability, dropout as low as 200mV at 10mA, and guaranteed performance across −40°C to +125°C without external resistor biasing.
Technical Context
The MAX6126B25+T employs curvature-corrected bandgap architecture with laser-trimmed thin-film resistors to achieve 5ppm/°C max tempco over −40°C to +125°C and ±0.06% initial accuracy. Its dual-output (OUTF/OUTS) and dual-ground (GND/GNDS) structure enables Kelvin sensing to cancel PCB trace IR drops in precision current sources and high-accuracy measurement front-ends.
It features a dedicated NR pin supporting 0.1μF capacitor addition to reduce 1kHz noise from 75nV/√Hz to 45nV/√Hz and 0.1Hz–10Hz flicker noise from 1.45μVP-P to 0.9μVP-P. Supply current remains stable at 380μA (typ) across 3.2V–12.6V input, with <2μA/V line sensitivity and load regulation ≤25μV/mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.06% at +25°C - defines absolute scaling for 16-bit+ ADCs/DACs without calibration. |
| Tempco (−40°C to +125°C) | 5ppm/°C max - ensures ≤±125ppm (±0.0003125V) drift over full automotive range. |
| Wideband Noise (1kHz) | 75nV/√Hz (no NR cap); 45nV/√Hz (with 0.1μF NR) - directly limits effective resolution in noise-sensitive data acquisition. |
| Dropout Voltage | 200mV max at 10mA - enables operation from 2.7V supply while maintaining 2.5V output, critical for low-voltage systems. |
| Load Regulation | 25μV/mA max - guarantees <±250μV shift across full 10mA sourcing/sinking range, essential for precision current sources. |
| Long-Term Stability | 20ppm/1000hr (SO package) - supports >10-year calibration intervals in metrology-grade equipment. |
| Capacitive Load Range | 0.1μF to 10μF - allows robust bypassing for fast-switching loads without oscillation risk. |
Pinout & Package
MAX6126B25+T is housed in an 8-pin SO (Small Outline) package with exposed pad (RoHS-compliant, lead-free). Pin 1 is NR (Noise Reduction), Pin 2 is IN, Pin 3 is GND, Pin 4 is GNDS, Pins 5 & 8 are internally connected (NC), Pin 6 is OUTS, and Pin 7 is OUTF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NR (Pin 1) | Noise reduction input | Accepts 0.1μF capacitor to lower 1kHz noise by 40% and suppress power-supply transients; left open if unused. |
| IN (Pin 2) | Positive supply input | Operates from 3.2V to 12.6V; supplies internal reference core with <380μA quiescent current independent of VIN. |
| GND (Pin 3) | Power ground return | Reference ground for internal circuitry; separate from GNDS to isolate sense path from power return currents. |
| GNDS (Pin 4) | Ground sense terminal | Connects to load-side ground point to cancel voltage drop in ground return path (Kelvin sensing). |
| OUTS (Pin 6) | Voltage sense output | Provides feedback voltage to internal regulator; connects to load-side reference node to maintain accuracy despite trace resistance. |
| OUTF (Pin 7) | Voltage force output | Delivers regulated 2.500V current to load; shorted to OUTS near load to enable 4-wire remote sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Force/Sense Output Architecture | Separate OUTF (power delivery) and OUTS (voltage sensing) pins eliminate errors from PCB trace resistance in precision current sources and high-accuracy DACs. |
| Ultra-Low Flicker Noise | 1.45μVP-P (0.1Hz–10Hz) - minimizes low-frequency drift in digital voltmeters and weigh-scale amplifiers. |
| Automotive Temperature Range | −40°C to +125°C operation with guaranteed specs - qualified for engine control units, battery management, and ADAS sensor interfaces. |
| Stable with Wide Capacitive Load | 0.1μF–10μF output capacitance tolerance - eliminates need for external compensation and supports dynamic load step response. |
| Low Dropout & High Current Drive | 200mV dropout at 10mA load - enables use with single-cell Li-ion (3.0V min) or 3.3V rails while delivering full 10mA sink/source. |
Applications
| High-Resolution A/D Converters | Precision Current Sources |
|---|---|
|
Use Scenario: 24-bit sigma-delta ADC in industrial process transmitter measuring 4–20mA loop current. IC Role / Device Role / Timing Role: Provides stable 2.500V reference for ADC's internal conversion ladder and external gain-setting resistors. Use Value: ±0.06% initial accuracy and 5ppm/°C tempco ensure <±0.001% full-scale error over temperature, enabling true 22-bit effective resolution. |
Use Scenario: Programmable 10mA precision current source for RTD excitation in temperature transmitters. IC Role / Device Role / Timing Role: Serves as voltage reference for op-amp-based Howland current source with OUTF driving transistor base and OUTS/GNDS enabling 4-wire sensing. Use Value: Force/sense architecture cancels up to 1Ω trace resistance, maintaining <0.1% current accuracy despite PCB layout variations. |
| Digital Voltmeters | High-Accuracy Industrial Control |
|
Use Scenario: Benchtop 6½-digit DVM measuring mV-level thermocouple outputs with auto-ranging. IC Role / Device Role / Timing Role: Supplies reference voltage to integrating ADC and programmable gain amplifier stages. Use Value: 1.45μVP-P (0.1Hz–10Hz) flicker noise prevents low-frequency baseline drift during 100ms integration cycles. |
Use Scenario: PLC analog input module conditioning 0–10V sensor signals in factory automation. IC Role / Device Role / Timing Role: References multiplexed ADC channels and calibrates offset/gain via microcontroller-controlled DACs. Use Value: 20ppm/1000hr long-term stability reduces annual recalibration frequency and supports predictive maintenance logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025IDR | 2.5V, ±0.02% initial accuracy, 3ppm/°C max tempco, 100nV/√Hz noise, SO-8 package | Higher initial accuracy but higher noise and no force/sense outputs - suited for static reference needs, not remote-sensing current sources | Select REF5025IDR when absolute initial accuracy dominates over noise and remote sensing capability. |
| ADR4525BRZ | 2.5V, ±0.02% initial accuracy, 2ppm/°C max tempco, 115nV/√Hz noise, SO-8 package, no NR pin | Lower tempco but significantly higher wideband noise and no noise-reduction option - better for DC-stable, low-tempco apps with relaxed noise budgets | Select ADR4525BRZ when ultra-low tempco is required and system-level filtering handles noise. |
Compared with REF5025IDR and ADR4525BRZ, the MAX6126B25+T trades minor initial accuracy degradation (±0.06% vs ±0.02%) for superior 1.45μVP-P flicker noise, integrated NR pin for 40% wideband noise reduction, and force/sense outputs enabling sub-0.1% current-source accuracy in real-world PCB layouts.
Availability
MAX6126B25+T is available at Aetrix Electronics and suitable for high-resolution A/D converters, precision current sources, and digital voltmeters requiring stable component supply across automotive and industrial temperature ranges.
Supply support for MAX6126B25+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 and mixed-signal ICs for demanding industrial, automotive, and medical applications.
The MAX6126 family delivers ultra-low-noise, high-accuracy series voltage references optimized for metrology-grade data acquisition, high-resolution ADC/DAC biasing, and precision current generation where thermal drift and flicker noise must be minimized.
FAQ
What is the maximum operating temperature range for the MAX6126B25+T?
The MAX6126B25+T is specified for continuous operation from −40°C to +125°C, with all electrical parameters guaranteed across this full automotive-grade temperature range. Its 5ppm/°C max temperature coefficient applies specifically over −40°C to +125°C, making it suitable for under-hood and industrial control environments where thermal stability is critical. The device's junction temperature limit is +150°C.
Does the MAX6126B25+T require an external resistor for biasing?
No, the MAX6126B25+T does not require an external resistor. As a series-mode voltage reference, its quiescent supply current is virtually independent of input voltage (380μA typical, with only 2μA/V max variation), eliminating the power waste and accuracy dependency associated with shunt-mode references. This simplifies design and improves efficiency in battery-powered and low-power systems.
How does the NR (Noise Reduction) pin function on the MAX6126B25+T?
The NR pin on the MAX6126B25+T accepts a 0.1μF capacitor to reduce wideband noise from 75nV/√Hz to 45nV/√Hz at 1kHz and flicker noise from 1.45μVP-P to 0.9μVP-P (0.1Hz–10Hz). This capacitor forms a low-pass filter on an internal noise-shaping node. Leaving NR unconnected maintains standard noise performance; the pin must never be shorted to ground or driven externally.
What is the purpose of separate OUTF and OUTS pins on the MAX6126B25+T?
The OUTF (force) and OUTS (sense) pins implement a Kelvin connection to eliminate voltage drop errors in PCB traces. OUTF delivers current to the load, while OUTS feeds back the actual voltage at the load point. By shorting them *at the load*, the MAX6126B25+T regulates voltage precisely where it matters-enabling <0.1% accuracy in precision current sources and high-gain instrumentation amplifiers despite trace resistance.
Can the MAX6126B25+T drive a 10μF output capacitor?
Yes, the MAX6126B25+T is explicitly characterized and guaranteed stable with output capacitance from 0.1μF to 10μF. Using 10μF (often in parallel with 0.1μF) improves transient response for rapidly changing loads, such as multiplexed ADC sampling or switching current sources. No external compensation is required, and stability is maintained across the full −40°C to +125°C temperature range.
MAX6126B25+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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 12ppm/°C
- Noise - 0.1Hz to 10Hz:
- 1.45µVp-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
MAX6126B25+T FAQ
1.How can I place an order for MAX6126B25+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6126B25+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 MAX6126B25+T reliable?
The price and inventory of MAX6126B25+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6126B25+T is usually 5 days.
3.What payment methods are accepted for MAX6126B25+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6126B25+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6126B25+T?
MAX6126B25+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6126B25+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 MAX6126B25+T?
For technical support, including MAX6126B25+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6126B25+T requirements.
6.How does Aetrix verify that MAX6126B25+T is sourced from the original manufacturer or authorized distributors?
All MAX6126B25+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 MAX6126B25+T meets industry standards.
7.What is the process for return or replacement of MAX6126B25+T?
All MAX6126B25+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6126B25+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 MAX6126B25+T part is unused and in its original packaging.
Return procedure for MAX6126B25+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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