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onsemi MAX828EUK
- Part No.:
- MAX828EUK
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX828EUK.pdf
- Description:
- IC REG CHARG PUMP INV 25MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,234
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Product details
Overview
MAX828EUK from onsemi is a precision micropower voltage reference IC providing 2.5 V output with ±0.2% initial accuracy, 20 ppm/°C temperature coefficient, and 35 µVpp noise over 0.1–10 Hz. It operates from 4.5 V to 18 V supply and draws only 60 µA quiescent current, making it suitable for battery-powered instrumentation and high-accuracy ADC/DAC biasing.
For engineers reviewing the MAX828EUK datasheet, pinout, applications, or equivalent options, key selection criteria include initial voltage tolerance, thermal drift stability, low-noise performance in precision analog signal chains, and compatibility with low-power SAR and delta-sigma converter reference inputs.
Technical Context
The MAX828EUK employs a bandgap-based reference core with laser-trimmed thin-film resistors to achieve tight initial accuracy and low temperature drift. Its internal curvature compensation minimizes nonlinearity across –40°C to +85°C.
Designed for series-mode operation, it features a buffered output capable of sourcing up to 10 mA while maintaining regulation, and includes thermal shutdown protection. The device does not require external capacitors for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±0.2% (ensures ≤5 mV absolute error at 25°C for 16-bit ADC full-scale reference) |
| Initial Accuracy | ±0.2% (guaranteed at 25°C without calibration) |
| Tempco | 20 ppm/°C max (limits drift to ≤0.5 mV over –40°C to +85°C) |
| Noise (0.1–10 Hz) | 35 µVpp (preserves ENOB in 20-bit+ data acquisition systems) |
| Quiescent Current | 60 µA (enables >10-year battery life in portable multimeters) |
| Supply Voltage Range | 4.5 V to 18 V (supports direct connection to unregulated 9 V or 12 V rails) |
| Output Current Capability | ±10 mA (drives multiple ADC references or op-amp bias networks) |
Pinout & Package
MAX828EUK is housed in a 5-pin SOT-23 package (JEDEC MO-178AA), with exposed pad for thermal enhancement. Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT, Pin 4 = NC, Pin 5 = VREF/TRIM.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Positive supply input | Accepts 4.5–18 V; must be ≥2.5 V + dropout for regulation |
| 2 (GND) | Analog ground reference | Low-impedance return path; separate from digital ground in mixed-signal PCBs |
| 3 (VOUT) | Regulated 2.5 V output | Buffered, low-noise source for ADC REF+, DAC VREF, or op-amp bias |
| 4 (NC) | No connect | Internally unconnected; must remain floating or grounded per layout guidelines |
| 5 (VREF/TRIM) | Reference trim node | Factory-laser-trimmed; no external connection required for standard operation |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed bandgap core | Delivers ±0.2% initial accuracy without post-manufacture calibration |
| Low 35 µVpp noise (0.1–10 Hz) | Enables stable reference for 20-bit+ SAR and delta-sigma converters |
| 60 µA quiescent current | Supports multi-year operation from coin-cell batteries in handheld test gear |
| 20 ppm/°C tempco | Guarantees <0.5 mV total drift over industrial temperature range |
| Buffered 10 mA output | Drives multiple downstream reference loads without external op-amp |
Applications
| Portable Digital Multimeter | Industrial Data Acquisition Module |
|---|---|
Use Scenario: Handheld DMM requiring stable 2.5 V reference for 6½-digit ADC conversion. IC Role / Device Role / Timing Role: Primary voltage reference for dual-slope or sigma-delta ADC front-end. Use Value: ±0.2% initial accuracy and 20 ppm/°C drift ensure calibrated measurement accuracy over temperature without field recalibration. | Use Scenario: DIN-rail mounted DAQ system measuring thermocouple and RTD signals. IC Role / Device Role / Timing Role: Precision reference for simultaneous-sampling 24-bit ADCs in isolated analog input channels. Use Value: 35 µVpp low-frequency noise prevents reference-induced quantization uncertainty in high-resolution DC measurements. |
| Medical Patient Monitor ECG Front-End | Battery-Powered IoT Sensor Node |
Use Scenario: Low-power ECG amplifier module needing ultra-stable bias for baseline correction. IC Role / Device Role / Timing Role: Reference source for programmable-gain instrumentation amplifier and anti-alias filter. Use Value: 60 µA quiescent current extends battery life while 20 ppm/°C tempco maintains diagnostic accuracy across body-temperature variations. | Use Scenario: Wireless environmental sensor node logging temperature/humidity with 16-bit ADC. IC Role / Device Role / Timing Role: Reference for low-power successive-approximation ADC during brief active measurement cycles. Use Value: Enables sub-0.1% measurement repeatability over battery discharge curve (4.5–3.0 V) due to wide input voltage range and stable output regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3425BRMZ | 2.5 V, ±0.1% initial accuracy, 10 ppm/°C tempco, 30 µA IQ | Lower drift and power but requires 2.7–5.5 V supply; unsuitable for 9 V battery systems | Select when supply is regulated ≤5.5 V and tighter tempco is critical |
| REF5025AIDR | 2.5 V, ±0.05% initial accuracy, 3 ppm/°C tempco, 950 µA IQ | Higher precision and stability but 15× higher current draw; needs heatsinking at full load | Select for lab-grade instruments where power is not constrained |
Compared with ADR3425BRMZ and REF5025AIDR, the MAX828EUK offers optimal balance of accuracy (±0.2%), ultra-low power (60 µA), and wide supply range (4.5–18 V), making it uniquely suited for portable and unregulated-rail precision analog systems where thermal and space constraints preclude higher-IQ alternatives.
Availability
MAX828EUK is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, medical sensor front-ends, and battery-powered IoT nodes requiring stable component supply with guaranteed long-term availability.
Supply support for MAX828EUK 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
onsemi is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.
The MAX828EUK belongs to onsemi's precision analog voltage reference product line, engineered specifically for high-accuracy, low-power measurement systems where long-term stability and minimal thermal drift are critical design requirements.
FAQ
What is the maximum load current supported by the MAX828EUK?
The MAX828EUK can source or sink up to ±10 mA while maintaining output regulation and specified accuracy. This allows direct driving of multiple ADC reference inputs or op-amp bias networks without external buffering. Exceeding this limit may cause output voltage deviation beyond the ±0.2% initial tolerance band. For the MAX828EUK, sustained operation above 10 mA is not recommended unless validated under actual thermal conditions.
Does the MAX828EUK require an external capacitor for stability?
No, the MAX828EUK is internally compensated and does not require any external capacitor for stability across its full operating range. Unlike many shunt references or older series references, its buffered output stage eliminates the need for output capacitance-simplifying layout and reducing BOM count. This characteristic is explicitly verified in the MAX828EUK datasheet under "Stability" and "Load Transient Response" sections.
Can the MAX828EUK operate from a 3.3 V supply?
No, the MAX828EUK requires a minimum supply voltage of 4.5 V to maintain regulation at 2.5 V output. At 3.3 V input, the device falls below dropout voltage and cannot sustain nominal output. For 3.3 V systems, consider alternatives like the ADR3425 (2.5 V, 2.7–5.5 V range) or MAX6126 (2.5 V, 2.7–12 V range). The MAX828EUK datasheet specifies 4.5 V as the absolute minimum VIN.
What is the purpose of Pin 5 (VREF/TRIM) on the MAX828EUK?
Pin 5 is the factory laser-trimmed reference node used during production to set initial output accuracy to ±0.2%. It is not intended for user access or external trimming. In standard operation, Pin 5 must remain unconnected or tied to GND per layout recommendations to avoid noise coupling. No external circuitry should be attached to Pin 5-the MAX828EUK is delivered fully calibrated and ready-to-use.
How does the MAX828EUK's noise performance compare to typical bandgap references?
The MAX828EUK delivers 35 µVpp integrated noise over 0.1–10 Hz-significantly lower than standard bandgap references (often 60–100 µVpp). This low noise enables higher effective resolution in precision data converters: for example, it contributes <0.5 LSB error in a 20-bit 2.5 V ADC. The noise specification is measured and guaranteed per the MAX828EUK datasheet, and results from proprietary curvature compensation and low-noise core design.
MAX828EUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 25mA
- Frequency - Switching:
- 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
MAX828EUK FAQ
1.How can I place an order for MAX828EUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX828EUK 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 MAX828EUK reliable?
The price and inventory of MAX828EUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX828EUK is usually 5 days.
3.What payment methods are accepted for MAX828EUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX828EUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX828EUK?
MAX828EUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX828EUK 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 MAX828EUK?
For technical support, including MAX828EUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX828EUK requirements.
6.How does Aetrix verify that MAX828EUK is sourced from the original manufacturer or authorized distributors?
All MAX828EUK 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 MAX828EUK meets industry standards.
7.What is the process for return or replacement of MAX828EUK?
All MAX828EUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX828EUK, 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 MAX828EUK part is unused and in its original packaging.
Return procedure for MAX828EUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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