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Analog Devices Inc./Maxim Integrated MAX6129AEUK21+T
- Part No.:
- MAX6129AEUK21+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6129AEUK21+T.pdf
- Description:
- IC VREF SERIES 2.048V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,464
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Product details
Overview
The MAX6129AEUK21+T from Maxim Integrated is a micropower, low-dropout bandgap voltage reference delivering 2.048V output with ±0.4% initial accuracy and 40ppm/°C max temperature coefficient in a 5-pin SOT23 package. It sources up to 4mA, sinks up to 1mA, operates from 2.5V to 12.6V supply, draws only 5.25µA (max) quiescent current, and maintains stability with capacitive loads up to 10µF - ideal for precision A/D converters and battery-powered handheld instruments.
For engineers reviewing the MAX6129AEUK21+T datasheet, MAX6129AEUK21+T pinout, MAX6129AEUK21+T application, or MAX6129AEUK21+T equivalent, key selection criteria include ultra-low supply current, 200mV dropout at 4mA load, no external compensation requirement, and guaranteed performance across –40°C to +85°C.
Technical Context
This series-mode voltage reference uses a precision bandgap core with internal compensation capacitance, eliminating need for external stabilization components. Its architecture supports stable operation with output capacitive loads from 0 to 10µF during sourcing and up to 0.4µF during sinking - enabling direct interface with ADC sample-and-hold inputs and low-ESR ceramic decoupling networks.
Designed for high-accuracy analog signal chains, the MAX6129AEUK21+T achieves 30µVP-P (0.1Hz–10Hz) and 115µVRMS (10Hz–1kHz) output noise, 43dB ripple rejection at 120Hz, and 450µs turn-on settling to 0.1% of final value - all while maintaining <1.5µA/V supply current variation over its full input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±0.4% (±8.2mV) at +25°C - matches LSB scaling for 11-bit systems over 0–2.048V full-scale range |
| Initial Accuracy | ±0.4% max - enables single-point calibration in portable instrumentation without trimming |
| Temp Coefficient | 40ppm/°C max - ensures ≤±0.33% output drift over –40°C to +85°C operating range |
| Supply Current | 5.25µA max - extends battery life in coin-cell–powered devices beyond 10 years at 10µA system sleep current |
| Dropout Voltage | 200mV max at 4mA load - allows operation from 2.5V supply while maintaining regulation down to 2.248V input |
| Noise (0.1–10Hz) | 30µVP-P - contributes <0.015 LSB error in 16-bit 2.048V-range ADCs |
| Load Regulation | 0.7µV/µA max - introduces <2.8mV shift across full 4mA sourcing range, within 0.14% of nominal output |
Pinout & Package
Package: 5-pin SOT23-5 (JEDEC MO-178AA), 2.9mm × 1.6mm footprint, 1.1mm height, thermal pad not present. Pin 1 marked by beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Positive supply input | Accepts 2.5V–12.6V; no bypass capacitor required, but 0.1µF ceramic improves transient response |
| 2 (GND) | Analog ground reference | Must connect to clean analog ground plane; substrate tied to GND per chip topology |
| 3, 4 (N.C.) | No-connect terminals | Internally connected; leave floating or tie to GND - no electrical function or signal path |
| 5 (OUT) | Precision reference output | Delivers regulated 2.048V; stable with 0–10µF capacitive loads when sourcing, 0–0.4µF when sinking |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 5.25µA max - reduces self-heating and enables >10-year battery life in always-on sensor nodes |
| No external capacitor required | Internal compensation ensures stability with 0–10µF output capacitance - eliminates BOM cost and layout area for external cap |
| Low dropout voltage | 200mV max at 4mA - permits use with single Li-ion cell (2.7–4.2V) or two alkaline cells (2.4–3.2V) |
| High source/sink capability | 4mA source / 1mA sink - drives ADC reference inputs, op-amp bias networks, and DAC buffers directly |
| Guaranteed temp performance | 40ppm/°C max TCVOUT over –40°C to +85°C - meets industrial-grade accuracy requirements without derating |
Applications
| Battery-Powered Handheld Instruments | Precision Data Acquisition Systems |
|---|---|
|
Use Scenario: Portable multimeter with 16-bit SAR ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and internal calibration DAC. Use Value: 2.048V output aligns exactly with 16-bit full-scale (65536 × 31.25µV = 2.048V), eliminating scaling error; 5.25µA supply current minimizes impact on 100µA sleep-mode budget. |
Use Scenario: Isolated industrial sensor node with 24-bit delta-sigma ADC and microcontroller. IC Role / Device Role / Timing Role: Low-noise, thermally stable reference for high-resolution analog-to-digital conversion. Use Value: 30µVP-P (0.1–10Hz) noise and 40ppm/°C TCVOUT ensure <0.005% total unadjusted error over temperature - critical for sub-0.1% system accuracy. |
| Low-Power Medical Sensors | Portable Test & Measurement Equipment |
|
Use Scenario: Wearable ECG monitor using coin-cell battery and 12-bit ADC. IC Role / Device Role / Timing Role: Reference for analog front-end gain stages and ADC reference input. Use Value: 200mV dropout enables operation down to 2.248V input - extends usable battery voltage range by ~150mV versus higher-dropout alternatives. |
Use Scenario: Benchtop DMM with dual-slope integrator and autoranging reference switching. IC Role / Device Role / Timing Role: Precision 2.048V reference for autoranging reference ladder and calibration standards. Use Value: ±0.4% initial accuracy and 150ppm long-term stability (1000h) reduce annual recalibration frequency and improve traceability confidence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3420ARJZ-R7 | 2.048V, ±0.1% initial accuracy, 30ppm/°C, 12µA supply current, SOT23-5 | Higher accuracy and lower drift, but 2.3× higher supply current limits battery life in ultra-low-power designs | Select when absolute initial accuracy dominates over quiescent power; verify layout compatibility with same pinout |
| REF3020AIDBZR | 2.048V, ±0.2% initial accuracy, 50ppm/°C, 45µA supply current, SOT23-3 | Lower cost, but 8.6× higher supply current and 3-pin package lacks N.C. pins for grounding flexibility | Choose for cost-sensitive, non-battery applications where board space is less constrained and power budget >40µA |
Compared with ADR3420ARJZ-R7 and REF3020AIDBZR, the MAX6129AEUK21+T uniquely balances ultra-low 5.25µA supply current with 0.4% accuracy and 40ppm/°C drift - making it optimal for multi-year battery-powered precision measurement where every nanoamp matters.
Availability
MAX6129AEUK21+T is available at Aetrix Electronics and suitable for battery-powered handheld instruments, precision data acquisition systems, and low-power medical sensors requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6129AEUK21+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6129 belongs to Maxim's ultra-low-power precision voltage reference product line, designed specifically for battery-operated and energy-constrained systems demanding high accuracy without sacrificing efficiency.
FAQ
What is the maximum load current the MAX6129AEUK21+T can source and sink?
The MAX6129AEUK21+T can source up to 4mA and sink up to 1mA of load current while maintaining specified accuracy and stability. This capability allows direct driving of ADC reference inputs, op-amp bias networks, and small logic interfaces without external buffering. Performance remains guaranteed across the full –40°C to +85°C temperature range and 2.5V to 12.6V supply range.
Does the MAX6129AEUK21+T require an external output capacitor for stability?
No, the MAX6129AEUK21+T does not require an external output capacitor for stability due to its internally compensated design. It remains stable with capacitive loads from 0 to 10µF when sourcing current and 0 to 0.4µF when sinking current. An external capacitor may be added to improve transient response in step-load applications, but it is optional and not needed for basic regulation.
What is the dropout voltage specification for the MAX6129AEUK21+T at full load?
The MAX6129AEUK21+T has a maximum dropout voltage of 200mV at 4mA output current. This means the device maintains regulation as long as the input voltage remains at least 2.048V + 0.2V = 2.248V. At zero load, dropout drops to 140mV typical, enabling efficient operation even near battery end-of-life in 2-cell alkaline or single Li-ion systems.
How does the supply current of the MAX6129AEUK21+T vary with input voltage?
The MAX6129AEUK21+T exhibits exceptionally stable supply current: maximum 5.25µA at any input voltage from 2.5V to 12.6V, with variation limited to 1.5µA/V max. This flat current profile minimizes self-heating effects and ensures predictable battery drain regardless of supply rail fluctuations - a critical advantage in energy-harvesting and coin-cell applications.
Is the MAX6129AEUK21+T pin-compatible with other members of the MAX6129 family?
Yes, all MAX6129 variants in the SOT23-5 package - including MAX6129AEUK25+T, MAX6129AEUK33+T, and MAX6129BEUK21+T - share identical pinout (IN, GND, N.C., N.C., OUT) and mechanical footprint. This enables drop-in replacement across output voltages and accuracy grades without PCB redesign, provided system-level electrical requirements (e.g., supply range, load current) remain compatible.
MAX6129AEUK21+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-74A, SOT-753
- 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:
- 4 mA
- Tolerance:
- ±0.4%
- Temperature Coefficient:
- 40ppm/°C
- Noise - 0.1Hz to 10Hz:
- 30µVp-p
- Noise - 10Hz to 10kHz:
- 115µVrms
- Voltage - Input:
- 2.5V ~ 12.6V
- Current - Supply:
- 5.25µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6129AEUK21+T FAQ
1.How can I place an order for MAX6129AEUK21+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6129AEUK21+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 MAX6129AEUK21+T reliable?
The price and inventory of MAX6129AEUK21+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6129AEUK21+T is usually 5 days.
3.What payment methods are accepted for MAX6129AEUK21+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6129AEUK21+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6129AEUK21+T?
MAX6129AEUK21+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6129AEUK21+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 MAX6129AEUK21+T?
For technical support, including MAX6129AEUK21+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6129AEUK21+T requirements.
6.How does Aetrix verify that MAX6129AEUK21+T is sourced from the original manufacturer or authorized distributors?
All MAX6129AEUK21+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 MAX6129AEUK21+T meets industry standards.
7.What is the process for return or replacement of MAX6129AEUK21+T?
All MAX6129AEUK21+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6129AEUK21+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 MAX6129AEUK21+T part is unused and in its original packaging.
Return procedure for MAX6129AEUK21+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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