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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:3,997
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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 analog signal chains. 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 systems operating from -40°C to +85°C.
For engineers reviewing the MAX6325EPA+ datasheet, MAX6325EPA+ pinout, MAX6325EPA+ application, or MAX6325EPA+ equivalent, key selection considerations include its 15mA source/sink capability, optional external trim (±1%), NR-pin noise reduction, and compatibility with capacitive loads up to 100µF without instability.
Technical Context
The MAX6325EPA+ uses buried-zener topology with proprietary low-power temperature compensation to achieve laboratory-grade stability without oven control. Its output voltage is internally set to 2.5V and supports ±1% adjustment via the TRIM pin using an external potentiometer.
It features dual-stage noise suppression: intrinsic low-noise zener core plus optional 1µF capacitor on the NR pin for wideband reduction. The device maintains excellent line regulation (30ppm/V) and load regulation (5ppm/mA) across its 8V–36V input range and ±15mA output current capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.5mV at +25°C - ensures absolute accuracy for 16-bit 2.5V full-scale conversion |
| Tempco (max) | 1.5ppm/°C over -40°C to +85°C - guarantees ≤±12ppm total drift across industrial temperature range |
| Initial Accuracy | ±0.02% (±0.5mV) - eliminates need for system-level calibration in precision metrology |
| Output Noise | 1.5µVp-p (0.1Hz–10Hz), 1.3µVRMS - preserves SNR in high-dynamic-range data acquisition |
| Load Regulation | 5ppm/mA - holds output within ±75µV under full 15mA sourcing/sinking |
| Line Regulation | 30ppm/V - limits output shift to ±105ppm over full 8V–36V input variation |
| Long-Term Stability | 30ppm/1000hr - ensures reference integrity over extended deployment in test equipment |
Pinout & Package
MAX6325EPA+ is housed in an 8-pin plastic DIP package (0.300" wide), RoHS-compliant and rated for -40°C to +85°C operation. Pin 1, 7, and 8 are internally connected and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 2) | Positive supply input | Accepts 8V–36V unregulated input; bypass capacitor recommended for ripple rejection |
| GND (Pin 4) | Reference ground | Low-impedance return path; must be star-connected to minimize noise coupling |
| NR (Pin 3) | Noise reduction node | Connects optional 1µF capacitor to reduce wideband output noise; open if unused |
| OUT (Pin 6) | Precision reference output | 2.5V output capable of sourcing/sinking ±15mA; stable with 0–100µF capacitive loads |
| TRIM (Pin 5) | External voltage adjustment | Supports ±1% output tuning via 10kΩ potentiometer; does not degrade tempco or stability |
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 |
| Optional NR capacitor | 1µF on NR pin reduces broadband noise without affecting DC accuracy or settling time |
| ±15mA output drive | Directly drives multiple SAR ADC references or op-amp buffers without external gain stages |
| Trim-adjustable output | TRIM pin enables fine-tuning to compensate for board-level errors or match system gain requirements |
| Capacitive-load immunity | Stable with 0–100µF output capacitance - simplifies filtering and decoupling design for noisy environments |
Applications
| High-Resolution Data Acquisition | Digital Voltmeters (DVMs) |
|---|---|
Use Scenario: 16-bit delta-sigma ADC measuring thermocouple or strain-gauge signals in environmental monitoring stations. IC Role / Device Role / Timing Role: Primary voltage reference establishing absolute scale for analog input conversion. Use Value: 0.5ppm/°C tempco and 1.5µVp-p noise ensure <1LSB error across temperature and time without recalibration. |
Use Scenario: Portable handheld DVM requiring 0.01% measurement accuracy over 8-hour field use. IC Role / Device Role / Timing Role: Stable 2.5V reference for autoranging ADC front-end and display scaling logic. Use Value: ±0.02% initial accuracy and 30ppm/1000hr stability maintain calibration integrity between annual service intervals. |
| ATE Equipment Reference Subsystem | Precision Current Source Calibration |
Use Scenario: Automated test system verifying 12–16-bit DAC linearity and monotonicity across production lots. IC Role / Device Role / Timing Role: Master reference for both stimulus generation and measurement digitization paths. Use Value: Matched line/load regulation (≤30ppm/V, ≤5ppm/mA) ensures identical reference behavior under varying supply and load conditions. |
Use Scenario: Programmable current source used in sensor excitation circuits for pressure transducers. IC Role / Device Role / Timing Role: Setpoint reference for op-amp-based Howland current pump with 4–20mA output. Use Value: TRIM pin allows factory calibration to ±0.01% output current accuracy, compensating for resistor tolerances and op-amp offsets. |
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 | Lower noise but higher tempco; requires external buffer for >10mA loads | Preferred when ultra-low noise dominates over temperature drift in lab-grade instruments |
| ADR441BRZ | 2.5V, 1ppm/°C max tempco, 1.75µVp-p noise, SO-8 package only | Superior tempco but no TRIM/NR pins; fixed-output only | Chosen when maximum thermal stability is critical and external trimming is unnecessary |
Compared with REF5025IDR and ADR441BRZ, the MAX6325EPA+ uniquely combines industrial temperature range, user-adjustable output, integrated noise reduction, and robust 15mA drive - making it optimal for field-deployed instrumentation where configurability and ruggedness are essential.
Availability
MAX6325EPA+ is available at Aetrix Electronics and suitable for high-resolution analog-to-digital converters, digital voltmeters, and ATE equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.
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) designs high-performance analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
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-conversion systems.
FAQ
What is the operating temperature range of the MAX6325EPA+?
The MAX6325EPA+ is rated for continuous operation from -40°C to +85°C. This extended industrial temperature range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet, and applies specifically to the E-grade (EPA) variant. The device maintains all specified electrical characteristics-including tempco, noise, and accuracy-within this full range.
Does the MAX6325EPA+ require an external capacitor on the NR pin?
No, the NR pin on the MAX6325EPA+ is optional. Connecting a 1µF capacitor between NR and GND reduces wideband output noise, but leaving NR unconnected still yields the specified 1.5µVp-p (0.1Hz–10Hz) noise performance. The datasheet explicitly states "Leave open if not used" in the Pin Description section.
Can the MAX6325EPA+ drive a 10µF output capacitor?
Yes, the MAX6325EPA+ is stable with output capacitance ranging from 0µF to 100µF across all load currents, as stated in the Applications Information section. This eliminates phase-margin concerns and simplifies filtering for noise-sensitive applications like precision ADC references.
What is the maximum output current capability of the MAX6325EPA+?
The MAX6325EPA+ can source and sink up to ±15mA while maintaining specified load regulation (5ppm/mA). This is guaranteed across the full temperature range and is documented in both the General Description and Electrical Characteristics tables, enabling direct interface with multiple ADC references or op-amp buffers.
Is the MAX6325EPA+ pin-compatible with other members of the MAX63xx family?
Yes, the MAX6325EPA+, MAX6341EPA+, and MAX6350EPA+ share identical 8-pin DIP pinouts and functional pin assignments (IN, GND, NR, OUT, TRIM), as shown in the Pin Configuration diagram. However, output voltage differs: 2.5V (MAX6325), 4.096V (MAX6341), and 5V (MAX6350), so substitution requires verification of system voltage requirements.
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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