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Analog Devices Inc./Maxim Integrated MAX6325EPA
- Part No.:
- MAX6325EPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX6325EPA.pdf
- Description:
- IC VREF SERIES 0.04% 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,842
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Product details
Overview
MAX6325EPA from Maxim Integrated is a precision 2.5V buried-zener voltage reference IC designed for high-resolution data-conversion systems. It delivers ±0.02% initial accuracy, 0.5ppm/°C typical temperature coefficient, and 1.5µVp-p (0.1Hz–10Hz) output noise - enabling stable reference performance in 16-bit ADC/DAC circuits operating from -40°C to +85°C.
For engineers reviewing the MAX6325EPA datasheet, MAX6325EPA pinout, MAX6325EPA application, or MAX6325EPA equivalent, key selection criteria include low-noise operation under capacitive loads, ±15mA source/sink capability, external trim support, and compatibility with 8-pin plastic DIP packaging for industrial-grade signal conditioning and metrology designs.
Technical Context
The MAX6325EPA uses buried-zener technology to achieve ultra-low noise and exceptional thermal stability without heater-based compensation. Its internal temperature-compensation scheme produces a near-flat output voltage vs. temperature curve across -40°C to +85°C, with guaranteed 1.5ppm/°C max tempco over that range.
It supports optional external trimming via the TRIM pin (±1% adjustment range) and wideband noise reduction via the NR pin (with 1µF capacitor), both functions fully decoupled from core reference stability. The device maintains stable regulation with load currents from -15mA to +15mA and input voltages from 8V to 36V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±1mV at +25°C - enables direct interface with 2.5V-input SAR ADCs and precision DACs without level-shifting. |
| Tempco (max) | 1.5ppm/°C over -40°C to +85°C - ensures ≤±30ppm (±75µV) total drift across full industrial temperature range. |
| Noise (0.1–10Hz) | 1.5µVp-p - contributes <0.0001 LSB error in 16-bit, 2.5V-FSR systems. |
| Initial Accuracy | ±0.02% (±500µV) - eliminates need for system-level calibration in high-accuracy metering applications. |
| Load Regulation | 5ppm/mA - maintains output stability under dynamic load changes up to ±15mA sink/source. |
| Line Regulation | 10ppm/V (8–36V input) - rejects supply ripple without requiring tight input regulation. |
| Long-Term Stability | 30ppm/1000hr - supports multi-year calibration intervals in test equipment and standards labs. |
Pinout & Package
The MAX6325EPA is housed in an 8-pin plastic DIP package (0.300" width), compatible with through-hole prototyping and industrial PCB assembly. Pin 1, 7, and 8 are internally connected and must remain unconnected on the PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8 | Internally Connected | Not usable; must be left floating - no external connection permitted. |
| 2 | IN | Positive power input (8–36V); requires local bypass capacitor for ripple rejection. |
| 3 | NR | Noise reduction node; accepts 1µF capacitor to reduce wideband output noise by >20dB. |
| 4 | GND | Analog ground reference; must be tied to clean, low-impedance system ground plane. |
| 5 | TRIM | External voltage divider tap point; enables ±1% output adjustment without degrading tempco. |
| 6 | OUT | Precision 2.5V reference output; stable with 0–100µF capacitive loads and ±15mA current sourcing/sinking. |
Key Features
| Feature | Design Value |
|---|---|
| Buried-zener core | Delivers lowest intrinsic noise (1.5µVp-p) and highest long-term stability (30ppm/1000hr) among precision references in its class. |
| Optional NR capacitor | 1µF on NR pin reduces output noise density by 30–40% across 10Hz–100kHz, critical for spectral purity in FFT-based measurements. |
| Trim-compatible architecture | TRIM pin allows field calibration or fine-tuning of output voltage while preserving factory tempco and accuracy specs. |
| Capacitive-load immunity | Stable with 0–100µF output capacitance - eliminates need for isolation resistors in noisy environments or long-trace layouts. |
| Industrial temperature grade | -40°C to +85°C operation with 1.5ppm/°C max tempco - qualified for use in PLC analog I/O modules and outdoor instrumentation. |
Applications
| High-Resolution Data Acquisition | Digital Voltmeters (DVMs) |
|---|---|
Use Scenario: 16-bit simultaneous-sampling ADC module in automated test equipment measuring sensor outputs with sub-µV resolution. IC Role / Device Role / Timing Role: Primary voltage reference for ADC full-scale calibration and ratiometric measurement reference. Use Value: 1.5µVp-p noise and ±0.02% accuracy ensure <0.001% measurement uncertainty over temperature and time. | Use Scenario: Portable 6½-digit handheld DVM requiring stable, low-drift reference for autoranging and auto-zero functions. IC Role / Device Role / Timing Role: Precision 2.5V reference for integrator ramp generation and comparator threshold setting. Use Value: 30ppm/1000hr long-term stability extends recalibration intervals to ≥12 months without degradation. |
| Process Control Transmitters | ATE Reference Subsystem |
Use Scenario: 4–20mA HART-enabled pressure transmitter operating in oilfield environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Stable excitation reference for bridge sensor conditioning and DAC output scaling. Use Value: 1.5ppm/°C max tempco guarantees ≤±125µV output shift across full temperature range, meeting SIL-2 accuracy requirements. | Use Scenario: Modular ATE slot card generating multiple calibrated DC levels for parametric testing of mixed-signal ICs. IC Role / Device Role / Timing Role: Master reference for programmable voltage sources and precision current sinks. Use Value: ±15mA sink/source capability enables direct drive of 50Ω/75Ω test loads without external buffers, reducing board area and noise coupling. |
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, 3ppm/°C max tempco, 1.2µVp-p noise, SO-8 package only - no DIP option. | Lower noise but higher tempco; requires PCB redesign for SO-8 footprint and lacks NR/trim pins. | Choose REF5025IDR only if SO-8 layout exists and noise dominates over thermal drift in your design. |
| ADR441BRTZ-REEL7 | 2.5V, 1.5ppm/°C max tempco, 1.75µVp-p noise, SOT-23-5 package - no TRIM/NR pins, 10mA max output. | Smaller footprint and lower power, but no external adjustment or noise filtering; limited load drive. | Choose ADR441BRTZ-REEL7 only for space-constrained, low-current (<10mA) portable instruments where DIP mounting is not required. |
Compared with REF5025IDR and ADR441BRTZ-REEL7, the MAX6325EPA uniquely combines DIP packaging, full trim/noise-reduction functionality, ±15mA drive, and 1.5ppm/°C tempco - making it the only drop-in solution for legacy industrial boards requiring field calibration and robust noise immunity.
Availability
MAX6325EPA is available at Aetrix Electronics and suitable for high-accuracy industrial process control, automated test equipment, and precision metrology applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6325EPA 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX6325EPA belongs to Maxim's precision voltage reference product line, engineered specifically for metrology-grade stability and low-noise operation in high-resolution data acquisition and calibration-critical systems.
FAQ
What is the maximum input voltage rating for the MAX6325EPA?
The MAX6325EPA has an absolute maximum input voltage rating of 40V on the IN pin, but its specified operating input voltage range is 8V to 36V. Operation outside this range may cause permanent damage or violate electrical specifications. For reliable long-term performance in industrial applications, maintain VIN within 8–36V and use appropriate input filtering. The MAX6325EPA's line regulation of 10ppm/V ensures minimal output variation across this full range.
Does the MAX6325EPA require an external capacitor on the NR pin?
No, the NR pin on the MAX6325EPA is optional - the device operates fully specified without any external capacitor. Adding a 1µF capacitor to NR reduces wideband output noise by up to 40% in the 10Hz–100kHz band, which is beneficial in FFT-based measurement systems. However, omitting the capacitor does not affect accuracy, tempco, or stability. The MAX6325EPA remains functional and compliant with all datasheet specs whether NR is left open or fitted with the recommended capacitor.
Can the MAX6325EPA drive a 10µF output capacitor?
Yes, the MAX6325EPA is explicitly characterized and guaranteed stable with output capacitive loads from 0µF to 100µF across all load currents (±15mA). This includes 10µF ceramic or tantalum capacitors commonly used for high-frequency noise suppression and transient response improvement. No series isolation resistor is needed. The MAX6325EPA's output stage is designed for unconditional stability under these conditions, making it suitable for noisy industrial environments where large bulk capacitance is required.
What is the purpose of the TRIM pin on the MAX6325EPA?
The TRIM pin on the MAX6325EPA allows external adjustment of the output voltage over a ±1% range (±25mV around 2.5V) using a simple 10kΩ potentiometer between OUT and GND, with the wiper connected to TRIM. This enables field calibration or fine-tuning without altering the device's temperature coefficient or long-term stability. The MAX6325EPA's trim function is fully decoupled from its core reference circuitry, so accuracy and drift specs remain valid after adjustment - a key advantage for metrology and calibration equipment.
Is the MAX6325EPA pin-compatible with other members of the MAX63xx family?
Yes, the MAX6325EPA shares identical pinout, package, and terminal functions with the MAX6341EPA and MAX6350EPA - all are 8-pin DIP devices with IN, GND, NR, TRIM, and OUT on the same pins. The only functional difference is the factory-set output voltage (2.5V, 4.096V, or 5.0V). This allows direct substitution in existing designs when changing reference voltage requirements, provided the downstream circuit tolerates the new output level. All three variants maintain identical noise, tempco, and drive specifications.
MAX6325EPA 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:
- ±0.04%
- Temperature Coefficient:
- 1.5ppm/°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
MAX6325EPA FAQ
1.How can I place an order for MAX6325EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6325EPA 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 MAX6325EPA reliable?
The price and inventory of MAX6325EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6325EPA is usually 5 days.
3.What payment methods are accepted for MAX6325EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6325EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6325EPA?
MAX6325EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6325EPA 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 MAX6325EPA?
For technical support, including MAX6325EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6325EPA requirements.
6.How does Aetrix verify that MAX6325EPA is sourced from the original manufacturer or authorized distributors?
All MAX6325EPA 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 MAX6325EPA meets industry standards.
7.What is the process for return or replacement of MAX6325EPA?
All MAX6325EPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6325EPA, 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 MAX6325EPA part is unused and in its original packaging.
Return procedure for MAX6325EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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