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Analog Devices Inc./Maxim Integrated MAX6325ESA+
- Part No.:
- MAX6325ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6325ESA+.pdf
- Description:
- IC VREF SERIES 0.04% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:343
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Product details
Overview
MAX6325ESA+ from Maxim Integrated is a precision 2.5V voltage reference IC using buried-zener technology, delivering ±0.02% initial accuracy, 1.5µVp-p (0.1Hz–10Hz) output noise, and 1.5ppm/°C max temperature coefficient over –40°C to +85°C. It sources/sinks ±15mA and supports external trimming and noise reduction, making it suitable for 16-bit ADC/DAC reference applications in test equipment and industrial control systems.
For engineers reviewing the MAX6325ESA+ datasheet, MAX6325ESA+ pinout, MAX6325ESA+ application, or MAX6325ESA+ equivalent, key selection criteria include low-noise performance, tight tempco, load regulation stability up to ±15mA, and compatibility with capacitive loads up to 100µF without oscillation.
Technical Context
The MAX6325ESA+ employs a buried-zener core with proprietary low-power temperature compensation, achieving near-zero curvature across –40°C to +85°C while avoiding heater-based power penalties. Its output stage is designed for stable operation with any capacitive load from 0µF to 100µF, eliminating need for output isolation resistors.
It features dedicated NR and TRIM pins enabling wideband noise reduction via 1µF capacitor and ±1% output adjustment using a 10kΩ potentiometer - both functions fully decoupled from temperature stability performance. Line regulation is specified at 10ppm/V (8V–36V input), and load regulation at 5ppm/mA over full ±15mA range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±1mV (±0.02% initial accuracy at +25°C) |
| Tempco (max) | 1.5ppm/°C over –40°C to +85°C - ensures <±30ppm drift across full industrial range |
| Output Noise | 1.5µVp-p (0.1Hz–10Hz) - critical for 16-bit converter LSB resolution (≈3.8µV at 2.5V) |
| Load Regulation | 5ppm/mA - maintains reference integrity under dynamic load shifts up to ±15mA |
| Line Regulation | 10ppm/V (8V–36V input) - rejects supply ripple without external LDO pre-regulation |
| Long-Term Stability | 30ppm/1000hr - predictable aging behavior for calibration-critical instrumentation |
| Supply Current | 1.8mA (typ) - enables low-power portable metrology designs |
Pinout & Package
MAX6325ESA+ is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, with 1.27mm pitch and gull-wing leads. Thermal resistance θJA is 5.88mW/°C above +70°C (derating to 471mW at +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8 | I.C. | Internally connected - no external connection; floating or tied to GND has no effect |
| 2 | IN | Positive supply input (8V–36V); internal regulator enables wide-input operation without external LDO |
| 3 | NR | Noise reduction node - accepts 1µF capacitor to reduce wideband noise; open-circuit if unused |
| 4 | GND | Analog ground reference - must be low-impedance, star-connected to minimize ground bounce |
| 5 | TRIM | External trim input - enables ±1% output adjustment via 10kΩ pot; does not degrade tempco |
| 6 | OUT | Precision 2.5V reference output - capable of sourcing/sinking ±15mA with <5ppm/mA regulation |
Key Features
| Feature | Design Value |
|---|---|
| Buried-zener core | Enables 1.5µVp-p (0.1Hz–10Hz) noise - 3× lower than bandgap references, preserving SNR in high-res converters |
| Capacitive-load stability | Operates stably with 0–100µF output capacitance - eliminates need for series resistor or ferrite bead in layout |
| Trim-adjustable output | ±1% fine-tuning via TRIM pin - allows system-level calibration without trimming external resistors |
| Transient response | Settles to ±0.01% in 8µs after load step - supports fast-switching multiplexed data acquisition |
| Input voltage range | 8V–36V operation - simplifies power architecture by accepting unregulated rails common in industrial PLCs |
Applications
| High-Resolution ADC Reference | Digital Voltmeter Front-End |
|---|---|
Use Scenario: 16-bit successive-approximation ADC in automated test equipment requiring sub-LSB accuracy over temperature. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion, directly setting full-scale range and determining absolute measurement accuracy. Use Value: 1.5ppm/°C tempco and 1.5µVp-p noise ensure <±0.5 LSB error across –40°C to +85°C, meeting Class A DVM specifications. |
Use Scenario: Portable handheld digital multimeter measuring DC voltage with 0.005% basic accuracy. IC Role / Device Role / Timing Role: Stable 2.5V reference for dual-slope integrator and ADC reference ladder. Use Value: 30ppm/1000hr long-term stability minimizes recalibration frequency; ±15mA drive supports internal analog front-end buffering. |
| Precision Current Source | ATE Equipment Calibration |
Use Scenario: Programmable current source for sensor excitation (e.g., RTD, strain gauge) in process control transmitters. IC Role / Device Role / Timing Role: Reference for op-amp-based Howland current source, defining output magnitude and stability. Use Value: Load regulation of 5ppm/mA ensures current accuracy remains unaffected by varying sensor impedance or cable length. |
Use Scenario: Rack-mounted ATE system performing automated calibration of DMMs and source-measure units. IC Role / Device Role / Timing Role: Master reference standard for self-test and traceable calibration routines. Use Value: ±0.02% initial accuracy and 1.5ppm/°C tempco provide NIST-traceable uncertainty budget for Class I calibration labs. |
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, 10mA max output, SO-8 package | Lower noise but reduced output drive; requires external buffer for >10mA loads | Preferred when ultra-low noise dominates over drive capability; verify thermal derating at 10mA in SO-8 |
| ADR441BRZ | 2.5V, 1.5ppm/°C max tempco, 1.75µVp-p noise, ±10mA output, SO-8 package | Slightly higher noise and lower sink capability; different pinout (TRIM on Pin 3 vs. Pin 5) | Drop-in alternative only with PCB redesign; use when ADR44x family ecosystem (e.g., ADR45xx regulators) is already deployed |
Compared with REF5025IDR and ADR441BRZ, the MAX6325ESA+ uniquely combines ±15mA bidirectional drive, 1.5ppm/°C tempco, and 1.5µVp-p noise in a pin-compatible SO-8 footprint - enabling direct replacement in high-current, high-accuracy reference designs without layout change or external buffering.
Availability
MAX6325ESA+ is available at Aetrix Electronics and suitable for high-resolution analog-to-digital converters, digital voltmeters, and precision current sources requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX6325ESA+ 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, communications, and computing markets.
The MAX6325ESA+ belongs to Maxim's precision voltage reference product line, engineered specifically for metrology-grade accuracy in calibration equipment, automated test systems, and high-end data acquisition where sub-ppm stability and ultra-low noise are mandatory.
FAQ
What is the maximum input voltage rating for the MAX6325ESA+?
The MAX6325ESA+ has an absolute maximum input voltage (IN pin) of 40V, but its specified operating range is 8V to 36V. Operation within this 8V–36V window guarantees all electrical characteristics including line regulation (10ppm/V), supply current (1.8mA typ), and output stability. Exceeding 36V risks violating parametric limits even if below 40V absolute max.
Can the MAX6325ESA+ drive a 100µF output capacitor without instability?
Yes - the MAX6325ESA+ is explicitly characterized and guaranteed stable with output capacitance from 0µF to 100µF across its full operating temperature and load range. This eliminates need for series isolation resistors or ferrite beads, simplifying layout and improving transient response in applications like multiplexed ADC reference distribution.
What is the purpose of the NR pin on the MAX6325ESA+ and how should it be used?
The NR (Noise Reduction) pin on the MAX6325ESA+ accepts a 1µF capacitor to ground to reduce wideband output noise. Data sheet Figure 2 and Typical Operating Characteristics confirm 1µF delivers optimal noise suppression; larger values yield diminishing returns. Leaving NR open disables noise reduction, retaining baseline 1.5µVp-p (0.1Hz–10Hz) performance.
Does external trimming via the TRIM pin affect the temperature coefficient of the MAX6325ESA+?
No - the MAX6325ESA+ datasheet states explicitly that external trimming "does not affect temperature stability." The TRIM pin adjusts output voltage ±1% using a 10kΩ potentiometer between OUT and GND, but the underlying buried-zener temperature compensation remains fully intact, preserving the 1.5ppm/°C max tempco across –40°C to +85°C after trimming.
How does the MAX6325ESA+ compare to the MAX6325CSA in terms of temperature range and tempco?
The MAX6325ESA+ is rated for –40°C to +85°C with 1.5ppm/°C max tempco, while the MAX6325CSA operates from 0°C to +70°C with 1.0ppm/°C max tempco. Both share identical pinout, noise (1.5µVp-p), accuracy (±0.02%), and drive capability (±15mA), but the ESA+ variant extends operational range for industrial and automotive under-hood applications where extended temperature coverage is required.
MAX6325ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6325ESA+ FAQ
1.How can I place an order for MAX6325ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6325ESA+ 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 MAX6325ESA+ reliable?
The price and inventory of MAX6325ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6325ESA+ is usually 5 days.
3.What payment methods are accepted for MAX6325ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6325ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6325ESA+?
MAX6325ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6325ESA+ 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 MAX6325ESA+?
For technical support, including MAX6325ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6325ESA+ requirements.
6.How does Aetrix verify that MAX6325ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX6325ESA+ 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 MAX6325ESA+ meets industry standards.
7.What is the process for return or replacement of MAX6325ESA+?
All MAX6325ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6325ESA+, 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 MAX6325ESA+ part is unused and in its original packaging.
Return procedure for MAX6325ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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