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Analog Devices Inc./Maxim Integrated MAX6225BEPA
- Part No.:
- MAX6225BEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX6225BEPA.pdf
- Description:
- IC VREF SERIES 0.12% 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,458
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Product details
Overview
MAX6225BEPA from Maxim Integrated is a precision 2.500V buried-zener voltage reference optimized for high-resolution data-conversion systems. It delivers ±0.02% initial accuracy, 7.0ppm/°C max temperature coefficient over –40°C to +85°C, and 1.5µVP-P (0.1Hz–10Hz) low-frequency noise. Designed for ADC/DAC reference rails in industrial instrumentation and ATE equipment, it supports ±15mA output sourcing/sinking with stable operation into all capacitive loads up to 100µF.
For engineers reviewing the MAX6225BEPA datasheet, MAX6225BEPA pinout, MAX6225BEPA application, or MAX6225BEPA equivalent, key selection criteria include its 7.0ppm/°C tempco grade, DIP-8 package compatibility with legacy layouts, trim-adjustable output (±25mV), and guaranteed load regulation performance across full –40°C to +85°C industrial temperature range.
Technical Context
The MAX6225BEPA employs buried-zener core technology with on-chip temperature compensation to achieve near-zero curvature in output vs. temperature. Its internal architecture enables stable DC output under dynamic load transients (settling to ±0.01% in 5µs) while maintaining low 18mW typical power consumption at 10V input.
It features dedicated NR (noise reduction) and TRIM terminals enabling external 1µF capacitor filtering and ±1% output adjustment via 10kΩ potentiometer-both functions fully decoupled from temperature stability performance. Input voltage range spans 8V to 36V, with line regulation specified at 7ppm/V (10V–36V) and load regulation at 7ppm/mA (sourcing) and 7ppm/mA (sinking) over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±3mV at +25°C; tight tolerance ensures direct interface with 16-bit SAR ADC reference inputs without gain calibration. |
| Tempco (Max) | 7.0ppm/°C over –40°C to +85°C; enables <±0.00175V drift across full industrial range-critical for metrology-grade measurements. |
| Noise (0.1–10Hz) | 1.5µVP-P; contributes <0.0001 LSB error in 16-bit 2.5V full-scale systems, preserving effective resolution. |
| Load Regulation | 7ppm/mA (sourcing/sinking); maintains output stability under dynamic DAC buffer or current-source load variations. |
| Supply Current | 2.7mA typical; enables low-power operation in battery-backed precision sensors and portable test gear. |
| Trim Range | ±25mV (±1%); allows fine-tuning to compensate for PCB trace resistance or system-level offset without recalibration. |
| Long-Term Stability | 20ppm/1000h; ensures reference integrity over years of continuous operation in automated test equipment. |
Pinout & Package
MAX6225BEPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1 is located at the left end of the top row when viewing the top side with notch or dot orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8 | I.C. (Internally Connected) | Unused pins; must be left unconnected-no external circuitry or grounding permitted. |
| 2 | IN | Positive supply input (8V–36V); requires local 2.2µF bypass capacitor to GND for ripple rejection. |
| 3 | NR | Noise reduction node; connect 1µF capacitor to GND to reduce wideband noise by >20dB above 10Hz. |
| 4 | GND | Analog ground reference; star-point connection recommended to minimize ground bounce in mixed-signal systems. |
| 5 | TRIM | External voltage adjust input; accepts 0–2.5V control for ±1% output tuning via 10kΩ potentiometer. |
| 6 | OUT | Stable 2.500V reference output; capable of sourcing/sinking ±15mA with <10mΩ effective output impedance at DC. |
Key Features
| Feature | Design Value |
|---|---|
| Buried-zener core | Enables 1.5µVP-P ultra-low noise and 20ppm/1000h long-term stability-superior to bandgap references in metrology applications. |
| Trim-adjustable output | ±25mV range via external potentiometer preserves factory accuracy while enabling system-level calibration without redesign. |
| Noise-reduction terminal (NR) | 1µF capacitor reduces integrated noise by 40% in 0.1–10Hz band-critical for digital voltmeters and weigh-scale front-ends. |
| Capacitive-load immunity | Stable with 0–100µF output capacitance; eliminates need for isolation resistors in noisy environments with large decoupling banks. |
| Industrial temperature range | –40°C to +85°C operation with 7.0ppm/°C max tempco ensures accuracy retention in factory automation and outdoor instrumentation. |
Applications
| High-Resolution Data Acquisition | Digital Voltmeter Reference |
|---|---|
Use Scenario: 16-bit delta-sigma ADC measuring thermocouple or strain-gauge signals in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion core, providing stable 2.500V full-scale reference with minimal drift during thermal cycling. Use Value: 7.0ppm/°C tempco and 1.5µVP-P noise ensure <±0.002% measurement uncertainty over full operating temperature range-meeting IEC 61000-4-30 Class A compliance. | Use Scenario: 6½-digit benchtop digital multimeter requiring sub-10ppm absolute accuracy over 24-hour calibration intervals. IC Role / Device Role / Timing Role: Precision reference source for dual-slope integrator and auto-zero amplifier stages. Use Value: 20ppm/1000h long-term stability and ±0.02% initial accuracy eliminate daily recalibration, reducing maintenance downtime by >90% versus standard bandgap references. |
| ATE Equipment Reference Rail | Precision Current Source Calibration |
Use Scenario: Automated test system generating calibrated voltage stimuli for IC parametric testing across –40°C to +85°C environmental chambers. IC Role / Device Role / Timing Role: Master reference for DAC-controlled stimulus generation and comparator threshold setting. Use Value: Guaranteed ±15mA sourcing/sinking capability and 5µs turn-on settling enable rapid test sequence execution without reference settling delays-increasing throughput by 18% versus older references. | Use Scenario: Programmable current source for sensor excitation (e.g., RTD, 4–20mA loop calibrators) requiring <10ppm current accuracy. IC Role / Device Role / Timing Role: Stable voltage reference for op-amp-based Howland current pump topology. Use Value: Low 18mW power dissipation and 7ppm/mA load regulation maintain current accuracy across varying load impedances and ambient temperatures-enabling ±0.005% current stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025IDR | 2.5V output, 3ppm/°C max tempco, SO-8 package, 3.8mA supply current | Lower tempco but higher quiescent current; no NR or TRIM pins; requires external filter for low-noise operation | Select for lower drift-critical lab instruments where board space is constrained and trimming is unnecessary. |
| ADR441BRZ | 2.5V output, 3ppm/°C max tempco, SO-8 package, 4.5mA supply current, 1.2µVP-P noise | Superior noise performance but no trim or NR functionality; limited to 10mA output drive | Choose for ultra-low-noise applications like seismic data loggers where external trimming is handled digitally. |
Compared with REF5025IDR and ADR441BRZ, the MAX6225BEPA offers unique field-adjustability (TRIM/NR), DIP-8 through-hole compatibility for prototyping and repair, and balanced trade-offs between tempco (7ppm/°C), noise (1.5µVP-P), and output drive (±15mA)-making it optimal for industrial ATE and embedded metrology where serviceability and design flexibility are prioritized.
Availability
MAX6225BEPA is available at Aetrix Electronics and suitable for high-resolution analog-to-digital converters, digital voltmeters, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6225BEPA 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 high-performance analog and mixed-signal semiconductors for precision, power, and interface applications.
The MAX6225BEPA belongs to Maxim's precision voltage reference product line, engineered specifically for metrology-grade instrumentation, industrial process control, and high-accuracy data acquisition where long-term stability and low noise are non-negotiable.
FAQ
What is the maximum operating temperature range for the MAX6225BEPA?
The MAX6225BEPA is rated for continuous operation from –40°C to +85°C. This extended industrial temperature range is confirmed in the Ordering Information table and Electrical Characteristics section, where all parameters-including tempco (7.0ppm/°C), load regulation (7ppm/mA), and output voltage (2.500V ±3mV)-are guaranteed across this full span. The "E" suffix in MAX6225BEPA explicitly denotes the –40°C to +85°C grade.
Does the MAX6225BEPA require an external capacitor on the NR pin for basic operation?
No, the MAX6225BEPA operates fully functional with the NR pin left open. The NR (Noise Reduction) pin is optional: connecting a 1µF capacitor to GND reduces wideband noise by >20dB above 10Hz, but the device delivers its specified 1.5µVP-P (0.1–10Hz) noise and all other electrical characteristics without any external NR capacitor. This flexibility allows designers to optimize noise performance only where needed.
Can the MAX6225BEPA drive a 10kΩ load while maintaining its specified accuracy?
Yes-the MAX6225BEPA can drive a 10kΩ load (250µA at 2.5V) with negligible impact on accuracy. Its load regulation is specified at 7ppm/mA (±7µV/mA), meaning a 250µA load shift introduces only ±1.75µV error-well within the ±3mV initial output tolerance and far below the 1.5µVP-P noise floor. This is validated in the Load Regulation table under "Sourcing: 0mA ≤ IOUT ≤ 15mA" conditions.
Is the MAX6225BEPA pin-compatible with other members of the MAX6225/MAX6241/MAX6250 family?
Yes, the MAX6225BEPA shares identical pinout and package (8-pin DIP) with all variants in the MAX6225/MAX6241/MAX6250 family-including MAX6241BEPA (4.096V) and MAX6250BEPA (5.000V). Pin functions (IN, NR, GND, TRIM, OUT) and unused pin locations (1,7,8) are identical across the family, enabling drop-in replacement when output voltage requirements change-provided the new voltage aligns with system full-scale range.
What is the purpose of the TRIM pin on the MAX6225BEPA, and how much adjustment does it provide?
The TRIM pin on the MAX6225BEPA enables external fine-tuning of the output voltage using a 10kΩ potentiometer connected between OUT and GND, with the wiper to TRIM. As specified in the Electrical Characteristics table, this provides a ±25mV (±1%) adjustment range around the nominal 2.500V output. Crucially, this trimming does not degrade the device's temperature coefficient or long-term stability-preserving metrology-grade performance after calibration.
MAX6225BEPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Series, Buried Zener
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.12%
- Temperature Coefficient:
- 7ppm/°C
- Noise - 0.1Hz to 10Hz:
- 1.5µVp-p
- Noise - 10Hz to 10kHz:
- 1.3µVrms
- Voltage - Input:
- 8V ~ 36V
- Current - Supply:
- 3mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX6225BEPA FAQ
1.How can I place an order for MAX6225BEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6225BEPA 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 MAX6225BEPA reliable?
The price and inventory of MAX6225BEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6225BEPA is usually 5 days.
3.What payment methods are accepted for MAX6225BEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6225BEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6225BEPA?
MAX6225BEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6225BEPA 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 MAX6225BEPA?
For technical support, including MAX6225BEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6225BEPA requirements.
6.How does Aetrix verify that MAX6225BEPA is sourced from the original manufacturer or authorized distributors?
All MAX6225BEPA 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 MAX6225BEPA meets industry standards.
7.What is the process for return or replacement of MAX6225BEPA?
All MAX6225BEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6225BEPA, 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 MAX6225BEPA part is unused and in its original packaging.
Return procedure for MAX6225BEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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