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Analog Devices Inc./Maxim Integrated MAX6129AEUK33
- Part No.:
- MAX6129AEUK33
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- -
- Datasheet:
-
MAX6129AEUK33.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
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Inventory:2,270
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Product details
Overview
The MAX6129AEUK33 from Maxim Integrated is a micropower, low-dropout series-mode bandgap voltage reference delivering a precise 3.300V output with ±0.4% initial accuracy and 40ppm/°C max temperature coefficient in a 5-pin SOT23 package. It sources up to 4mA and sinks up to 1mA, operates from 3.5V to 12.6V supply, draws only 7.25µA (max) quiescent current, and maintains stability with capacitive loads up to 10µF - ideal for precision battery-powered instrumentation and data converters.
For engineers reviewing the MAX6129AEUK33 datasheet, MAX6129AEUK33 pinout, MAX6129AEUK33 application, or MAX6129AEUK33 equivalent, key selection criteria include ultra-low supply current, tight initial tolerance, low thermal drift, dropout voltage under load, and compatibility with high-capacitance loads without external compensation.
Technical Context
The MAX6129AEUK33 is a series-mode voltage reference using a bandgap core with internal compensation, eliminating need for external capacitors. Its architecture supports sourcing and sinking load current while maintaining regulation across a wide 3.5V–12.6V input range and over –40°C to +85°C ambient temperature.
It achieves 0.1% turn-on settling in 1ms with no external components, exhibits 2.4–7 µV/µA load regulation (sourcing/sinking), and delivers 38dB ripple rejection at 120Hz - enabling direct integration into high-resolution ADC/DAC reference paths and low-power sensor signal chains where long-term stability and minimal board space are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±0.4% at +25°C - ensures ≤13.2mV absolute error in precision 12-bit+ systems |
| Temp Coefficient | 40ppm/°C max - contributes ≤±1.32mV drift over –40°C to +85°C operating range |
| Supply Current | 7.25µA max - enables >10-year battery life in 10µA-sleep IoT nodes |
| Dropout Voltage | 200mV max at 4mA load - allows operation from 3.5V supply with 3.3V rail margin |
| Load Regulation | 7µV/µA max (sinking) - holds output within ±7mV across full –1mA to +4mA load swing |
| Noise (0.1–10Hz) | 56µVP-P - supports 16-bit ADCs without added filtering |
| Ripple Rejection | 38dB at 120Hz - suppresses line-frequency artifacts in AC-powered precision supplies |
Pinout & Package
The MAX6129AEUK33 is housed in a miniature 5-pin SOT23-5 surface-mount package (JEDEC MO-178AA), occupying 70% less PCB area than SO-8 alternatives. Pin 1 is IN, 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Positive supply input | Accepts 3.5V–12.6V; no bypass capacitor required but improves transient response |
| 2 (GND) | Analog ground reference | Must be low-impedance connection to system ground plane for stable reference output |
| 3, 4 (N.C.) | Internally connected, unused | No electrical function; may be left unconnected or grounded to reduce EMI susceptibility |
| 5 (OUT) | Precision 3.300V reference output | Sources up to 4mA / sinks up to 1mA; stable with 0–10µF capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 7.25µA max supply current | Minimizes power loss in always-on sensor nodes and extends coin-cell battery life beyond 5 years |
| Internal compensation capacitor | Eliminates need for external stabilization components - reduces BOM count and layout complexity |
| Stable with 10µF output capacitance | Enables use with large decoupling caps on noisy digital rails without oscillation risk |
| ±0.4% initial accuracy (Grade A) | Meets 12-bit DAC/ADC full-scale error budgets without factory calibration |
| Low 200mV dropout at 4mA | Permits operation from single Li-ion cell (3.0V min) with headroom for 3.3V logic |
Applications
| Battery-Powered Handheld Instruments | Precision Data Acquisition Systems |
|---|---|
Use Scenario: Portable multimeter or environmental sensor logger powered by two AA cells. IC Role / Device Role / Timing Role: Provides stable 3.300V reference for 16-bit SAR ADC measuring thermistor, RTD, or pressure transducer outputs. Use Value: Enables <1 LSB error over –10°C to +50°C operating range without calibration, leveraging 40ppm/°C TCVOUT and 0.4% initial accuracy. | Use Scenario: Industrial PLC analog input module with isolated 4–20mA and voltage channels. IC Role / Device Role / Timing Role: Supplies reference voltage to dual 24-bit ΣΔ ADCs handling multiple sensor inputs simultaneously. Use Value: Delivers 56µVP-P low-frequency noise and 38dB PSRR to maintain ENOB >20 bits in electrically noisy factory environments. |
| Low-Power Sensor Signal Conditioning | Medical Wearable Vital Sign Monitors |
Use Scenario: Wearable ECG patch with ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: References instrumentation amplifier gain stage and ADC conversion in sub-100µA active mode. Use Value: 7.25µA supply current and 1ms turn-on time allow rapid wake-up sampling without reference settling delay. | Use Scenario: FDA-cleared pulse oximeter using photodiode array and low-noise analog processing. IC Role / Device Role / Timing Role: Supplies reference to transimpedance amplifier and 14-bit ADC capturing weak optical signals. Use Value: 2.4–7 µV/µA load regulation ensures consistent gain accuracy across varying LED drive currents and battery voltage decay. |
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 TCVOUT, 12µA supply current, SOT23-5 | Higher accuracy and lower drift, but 1.7× higher supply current limits battery life in ultra-low-power designs | Select when long-term stability and tighter drift dominate over quiescent current budget |
| REF3333AIDBVR | 3.3V output, ±0.2% initial accuracy, 50ppm/°C TCVOUT, 6µA supply current, SOT23-5 | Lower supply current than MAX6129AEUK33, but higher tempco and reduced load drive (25mA max source) | Select when supply current is most constrained and ±50ppm/°C drift is acceptable for target temperature range |
Compared with ADR3433ARJZ-R7 and REF3333AIDBVR, the MAX6129AEUK33 offers the best balance of ultra-low 7.25µA supply current, 40ppm/°C drift, and 4mA output drive - making it optimal for portable instrumentation requiring both precision and multi-year battery operation.
Availability
MAX6129AEUK33 is available at Aetrix Electronics and suitable for battery-powered handheld instruments, precision data acquisition systems, and low-power sensor signal conditioning requiring stable component supply and guaranteed long-term availability.
Supply support for MAX6129AEUK33 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, medical, and communications applications.
The MAX6129 family is designed for ultra-low-power, high-accuracy voltage reference needs in space-constrained, battery-operated systems - emphasizing micropower operation, internal stability, and precision over wide temperature ranges.
FAQ
What is the maximum load current the MAX6129AEUK33 can source and sink?
The MAX6129AEUK33 can source up to 4mA and sink up to 1mA while maintaining regulation within specified accuracy. This dual-direction capability supports active pull-up/pull-down configurations in precision analog circuits. The 4mA sourcing limit is confirmed in the General Description and Electrical Characteristics table for VOUT = 3.300V, and the 1mA sinking limit is explicitly stated in the Features section and reinforced in Load Regulation test conditions. These values apply across the full –40°C to +85°C operating range.
Does the MAX6129AEUK33 require external capacitors for stability?
No, the MAX6129AEUK33 does not require external capacitors for stability due to its internal compensation capacitor. It remains stable driving capacitive loads from 0 to 10µF when sourcing current and from 0 to 0.4µF when sinking current. While an optional 0.1µF ceramic capacitor on the IN pin improves transient response, neither input nor output bypassing is mandatory - a key advantage for space-constrained designs. This behavior is verified in the Applications Information section and Typical Operating Characteristics.
What is the dropout voltage specification for the MAX6129AEUK33 at full load?
The MAX6129AEUK33 has a maximum dropout voltage of 200mV at 4mA output current, defined as the minimum VIN – VOUT differential needed to maintain regulation within 0.1% of nominal output. At zero load, dropout is typically 0.2mV. This low dropout enables operation from 3.5V supplies while delivering a stable 3.300V reference - critical for single-cell Li-ion or alkaline battery systems. The value is specified in the Electrical Characteristics table for MAX6129_33 and confirmed in Figure toc07.
How does the supply current of the MAX6129AEUK33 vary with input voltage?
The MAX6129AEUK33 exhibits exceptionally stable supply current: maximum variation is only 1.5µA/V across its 3.5V to 12.6V input range. At 3.5V, typical supply current is 7.25µA (max); this increases linearly but remains tightly bounded - e.g., at 12.6V, total supply current stays below 8.6µA. This near-constant current draw minimizes power dissipation variance and simplifies battery-life estimation. The parameter "Change in Supply Current (IIN/VIN)" is explicitly listed in the MAX6129_33 Electrical Characteristics table.
What grade and accuracy does the MAX6129AEUK33 specify?
The MAX6129AEUK33 specifies Grade A performance: ±0.4% initial accuracy at +25°C and 40ppm/°C maximum temperature coefficient. This is confirmed in the Ordering Information table (where "A" denotes Grade A), the Selector Guide (listing "MAX6129AEUK33-T" with "0.4" under Initial Accuracy), and the MAX6129_33 Electrical Characteristics table showing MIN/MAX output voltage bounds of 3.2868V to 3.3132V. Grade B variants (e.g., MAX6129BEUK33-T) offer ±1% accuracy and 100ppm/°C TCVOUT.
MAX6129AEUK33 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- -
- 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 FAQ
1.How can I place an order for MAX6129AEUK33 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6129AEUK33 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 reliable?
The price and inventory of MAX6129AEUK33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6129AEUK33 is usually 5 days.
3.What payment methods are accepted for MAX6129AEUK33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6129AEUK33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6129AEUK33?
MAX6129AEUK33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6129AEUK33 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?
For technical support, including MAX6129AEUK33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6129AEUK33 requirements.
6.How does Aetrix verify that MAX6129AEUK33 is sourced from the original manufacturer or authorized distributors?
All MAX6129AEUK33 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 meets industry standards.
7.What is the process for return or replacement of MAX6129AEUK33?
All MAX6129AEUK33 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6129AEUK33, 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 part is unused and in its original packaging.
Return procedure for MAX6129AEUK33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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