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Analog Devices Inc./Maxim Integrated MAX6129AEUK33+T
- Part No.:
- MAX6129AEUK33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- -
- Datasheet:
-
MAX6129AEUK33+T.pdf
- Description:
- IC VREF SERIES 3.3V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,166
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Product details
Overview
MAX6129AEUK33+T from Maxim Integrated is a micropower, low-dropout bandgap voltage reference delivering 3.300V ±0.4% initial accuracy, 40ppm/°C max temperature coefficient, and ultra-low 7.25µA (max) supply current in a 5-pin SOT23 package. It sources up to 4mA and sinks up to 1mA, operates from 3.5V to 12.6V input, and maintains stability with capacitive loads up to 10µF-ideal for precision ADC/DAC biasing in battery-powered handheld instruments.
For engineers reviewing the MAX6129AEUK33+T datasheet, MAX6129AEUK33+T pinout, MAX6129AEUK33+T application, or MAX6129AEUK33+T equivalent, this page provides verified electrical parameters, validated SOT23-5 terminal mapping, confirmed load regulation (≤0.6 µV/µA), dropout behavior (140–200mV at 4mA), and real-world transient response data per output voltage variant.
Technical Context
The MAX6129AEUK33+T is a series-mode bandgap reference using internal compensation to eliminate external capacitors while ensuring stability across 0–10µF load capacitance. Its BiCMOS process enables ultra-low quiescent current (7.25µA max) with minimal supply-voltage dependence (≤1.5µA/V variation).
It delivers fixed 3.300V output with A-grade accuracy (±0.4% at +25°C), 40ppm/°C max drift over –40°C to +85°C, and supports precision analog signal chains requiring <1LSB error in 14-bit systems across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±0.4% at +25°C - ensures ≤13.2mV absolute error for 14-bit ADC full-scale reference |
| Temp Coefficient | 40ppm/°C max - limits drift to ±3.3mV over –40°C to +85°C ambient range |
| Supply Current | 7.25µA max - enables >10-year battery life in 10µA-sleep IoT sensors |
| Dropout Voltage | 140–200mV at 4mA load - allows operation from 3.5V input, compatible with single-cell LiFePO₄ |
| Load Regulation | ≤0.6 µV/µA sourcing - maintains <2.4mV shift from 0 to 4mA load, critical for ratiometric sensor excitation |
| Noise (10Hz–1kHz) | 174µVRMS - contributes <0.05% of 3.3V FS noise floor, suitable for 16-bit SAR ADCs |
| Line Regulation | 30–270 µV/V - holds output change <0.9mV over full 3.5–12.6V input swing |
Pinout & Package
MAX6129AEUK33+T uses a 5-pin SOT23-5 surface-mount package (JEDEC MO-178AA), occupying 70% less PCB area than SO-8 alternatives. Pin 1 is IN (input supply), Pin 2 is GND, Pins 3 and 4 are internally connected no-connect terminals (may be left floating or tied to ground), and Pin 5 is OUT (3.300V reference output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Positive supply input | Accepts 3.5V–12.6V; no input capacitor required, but 0.1µF ceramic improves transient immunity |
| 2 (GND) | Analog ground reference | Must be low-impedance connection; separates reference return from digital/power grounds |
| 3, 4 (N.C.) | Internally connected, unused | May be left unconnected or grounded-no functional impact on output accuracy or stability |
| 5 (OUT) | Precision 3.300V reference output | Sources 4mA / sinks 1mA; stable with 0–10µF capacitive loads; no external compensation needed |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 7.25µA max enables multi-year operation on coin-cell batteries in portable instrumentation |
| No external capacitors required | Internal compensation eliminates need for output bypass, saving board space and BOM cost |
| Low dropout voltage | 200mV max at full 4mA load permits use with low-headroom supplies like 3.5V LDOs |
| Stable with large capacitive loads | Guaranteed stability driving 10µF output capacitance-supports low-ESR ceramic or polymer caps |
| A-grade precision | ±0.4% initial accuracy and 40ppm/°C TC meet requirements for 14-bit data converters without calibration |
Applications
| Battery-Powered Handheld Instruments | Precision ADC Reference for Sensor Signal Chains |
|---|---|
|
Use Scenario: Portable multimeter or gas detector operating from single 3.7V Li-ion cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Provides stable 3.300V reference for 16-bit sigma-delta ADC measuring thermocouple or bridge sensor outputs. Use Value: 7.25µA supply current extends battery life; 40ppm/°C TC ensures <±0.5°C measurement drift over operating temperature range. |
Use Scenario: Industrial pressure transmitter with isolated 4–20mA output and onboard microcontroller. IC Role / Device Role / Timing Role: Supplies ratiometric reference to 24-bit ADC sampling strain-gauge bridge, referenced to same 3.3V rail as excitation. Use Value: Load regulation ≤0.6 µV/µA prevents gain error when bridge current varies; no external cap simplifies layout in tight isolation barriers. |
| Low-Power Data Acquisition Modules | Portable Medical Devices (e.g., ECG Front-End) |
|
Use Scenario: Wireless environmental monitor logging temperature/humidity via BLE, powered by CR2032. IC Role / Device Role / Timing Role: Generates precise 3.300V reference for successive-approximation ADC digitizing RTD and humidity sensor signals. Use Value: 200mV dropout allows operation down to 3.5V input-extending usable battery voltage range by 0.2V versus higher-dropout references. |
Use Scenario: Battery-operated wearable ECG patch acquiring 12-bit biopotential signals at 250SPS. IC Role / Device Role / Timing Role: Supplies low-noise 3.300V reference to instrumentation amplifier and ADC, minimizing baseline wander. Use Value: 174µVRMS (10Hz–1kHz) noise contributes <0.005% of full-scale, preserving diagnostic SNR in sub-mV cardiac signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3433ARJZ-R7 | 3.3V output, ±0.1% initial accuracy, 10ppm/°C TC, 4.5µA supply current, SOT23-5 | Higher accuracy and lower drift, but requires 1µF output capacitor for stability | Select for metrology-grade systems where long-term stability outweighs board-space constraints |
| REF3333AIDBVR | 3.3V output, ±0.2% initial accuracy, 50ppm/°C TC, 3.9µA supply current, SOT23-5 | Lower supply current, but only stable with ≥1nF output capacitance; limited sink capability (0.5mA) | Prefer for ultra-low-power sleep modes where load current rarely exceeds 1mA and external cap is acceptable |
Compared with ADR3433ARJZ-R7 and REF3333AIDBVR, the MAX6129AEUK33+T trades minor accuracy and drift penalties for capacitor-free operation and robust 4mA sourcing-making it optimal for space-constrained, high-reliability portable designs where layout simplicity and load flexibility are prioritized.
Availability
MAX6129AEUK33+T is available at Aetrix Electronics and suitable for battery-powered handheld instruments, precision ADC reference for sensor signal chains, and low-power data acquisition modules requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6129AEUK33+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 power, sensing, and interface applications, with emphasis on low-power, high-accuracy performance.
The MAX6129 family targets ultra-low-power precision voltage references for portable and battery-critical systems, combining micropower operation, miniature packaging, and capacitor-free stability to simplify high-resolution data acquisition design.
FAQ
What is the maximum load current the MAX6129AEUK33+T can source and sink?
The MAX6129AEUK33+T can source up to 4mA and sink up to 1mA of load current while maintaining specified accuracy and stability. This dual-direction capability supports both active pull-up and pull-down configurations in precision analog circuits, such as ratiometric sensor excitation or DAC output buffering. The device remains stable under these loads without requiring external compensation components.
Does the MAX6129AEUK33+T require an external output capacitor?
No, the MAX6129AEUK33+T does not require an external output capacitor for stability-it incorporates internal compensation optimized for capacitive loads from 0 to 10µF. This eliminates BOM cost and PCB area typically needed for decoupling, making it ideal for space-constrained portable designs. An external capacitor may still be added to improve transient response in high-dynamic-load applications.
What is the dropout voltage specification for the MAX6129AEUK33+T?
The MAX6129AEUK33+T has a dropout voltage of 140mV (typical) to 200mV (maximum) at 4mA output current. This low dropout enables operation from input voltages as low as 3.5V, supporting compatibility with single-cell LiFePO₄ or regulated 3.3V rails with minimal headroom. Dropout is defined as the minimum VIN–VOUT differential required to maintain 0.1% output regulation.
How does the supply current of the MAX6129AEUK33+T vary with input voltage?
The MAX6129AEUK33+T exhibits highly stable supply current: maximum variation is 1.5µA/V across its 3.5V to 12.6V input range. At nominal conditions, supply current is 7.25µA (max), increasing only marginally with VIN-ensuring predictable power budgeting in wide-input-voltage systems like automotive or industrial power supplies.
Is the MAX6129AEUK33+T suitable for 14-bit or higher resolution ADC applications?
Yes, the MAX6129AEUK33+T is suitable for 14-bit ADC applications: its ±0.4% initial accuracy and 40ppm/°C max temperature coefficient limit total error to <±1 LSB over –40°C to +85°C for a 3.3V reference. Combined with 174µVRMS (10Hz–1kHz) noise and excellent line/load regulation, it meets the static and dynamic requirements of precision SAR and sigma-delta converters without trimming.
MAX6129AEUK33+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- -
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6129AEUK33+T FAQ
1.How can I place an order for MAX6129AEUK33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6129AEUK33+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 MAX6129AEUK33+T reliable?
The price and inventory of MAX6129AEUK33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6129AEUK33+T is usually 5 days.
3.What payment methods are accepted for MAX6129AEUK33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6129AEUK33+T transactions.
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4.How is shipping managed for MAX6129AEUK33+T?
MAX6129AEUK33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6129AEUK33+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 MAX6129AEUK33+T?
For technical support, including MAX6129AEUK33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6129AEUK33+T requirements.
6.How does Aetrix verify that MAX6129AEUK33+T is sourced from the original manufacturer or authorized distributors?
All MAX6129AEUK33+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 MAX6129AEUK33+T meets industry standards.
7.What is the process for return or replacement of MAX6129AEUK33+T?
All MAX6129AEUK33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6129AEUK33+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 MAX6129AEUK33+T part is unused and in its original packaging.
Return procedure for MAX6129AEUK33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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