My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6325CPA+
- Part No.:
- MAX6325CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX6325CPA+.pdf
- Description:
- IC VREF SERIES 0.04% 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,918
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6325CPA+ from Maxim Integrated is a precision 2.5V buried-zener voltage reference IC with 0.5ppm/°C typical temperature coefficient, ±0.02% initial accuracy, and 1.5µVp-p (0.1Hz–10Hz) output noise-designed for high-resolution ADC/DAC biasing in metrology-grade instrumentation and calibration systems.
For engineers reviewing the MAX6325CPA+ datasheet, MAX6325CPA+ pinout, MAX6325CPA+ application, or MAX6325CPA+ equivalent, this device is evaluated for low-drift, low-noise reference stability in 16-bit+ data acquisition, precision current sources, and ATE equipment requiring long-term repeatability and minimal thermal hysteresis.
Technical Context
The MAX6325CPA+ employs buried-zener core technology to achieve ultra-low noise and sub-1ppm/°C max temperature coefficient across 0°C to +70°C. Its internal compensation delivers flat ∆VOUT/∆T response without ovenized power overhead.
It supports bidirectional load current (±15mA), features optional external trimming (±1% via TRIM pin), and includes dedicated NR pin for 1µF capacitor-based wideband noise reduction-enabling stable operation with capacitive loads up to 100µF without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±1mV at +25°C - enables direct interface with 2.5V full-scale SAR and sigma-delta ADCs |
| Tempco (max) | 1ppm/°C - ensures ≤2.5µV/°C drift over 0°C to +70°C operating range |
| Initial Accuracy | ±0.02% - guarantees ≤500µV absolute error at power-up, critical for factory calibration |
| Output Noise | 1.5µVp-p (0.1Hz–10Hz) - minimizes quantization uncertainty in high-resolution digitization |
| Load Regulation | 5ppm/mA - maintains <12.5µV error across full ±15mA sourcing/sinking range |
| Line Regulation | 10ppm/V (8V–36V input) - rejects supply ripple without external LDO pre-regulation |
| Long-Term Stability | 30ppm/1000hr - supports multi-year system calibration intervals without field recalibration |
Pinout & Package
MAX6325CPA+ is housed in an 8-pin plastic DIP package (0.300" width), RoHS-compliant and lead-free. Pin 1, 7, and 8 are internally connected and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8 | I.C. | Internally connected; no external connection permitted - floating pins reduce parasitic coupling |
| 2 | IN | Positive supply input (8V–36V); accepts unregulated rails common in industrial power supplies |
| 4 | GND | Analog ground reference; requires star-point connection to minimize ground bounce in mixed-signal systems |
| 3 | NR | Noise reduction terminal; accepts 1µF capacitor to cut wideband noise by >20dB above 10Hz |
| 6 | OUT | Precision 2.5V reference output; capable of sourcing/sinking ±15mA with <1Ω effective output impedance at DC |
| 5 | TRIM | External trim input; enables ±1% adjustment via 10kΩ potentiometer without degrading tempco or noise |
Key Features
| Feature | Design Value |
|---|---|
| Buried-zener core | Delivers lowest intrinsic noise (1.5µVp-p) and highest long-term stability (30ppm/1000hr) among non-heated references |
| Optional NR capacitor | 1µF on NR pin reduces integrated noise by 40% in 0.1Hz–10Hz band - eliminates need for post-regulator filtering |
| ±15mA drive capability | Directly drives ADC reference inputs, op-amp gain-setting networks, and precision current mirrors without buffer amplifiers |
| Stable with 0–100µF load capacitance | Eliminates output phase-margin concerns during load transients - supports fast-settling multiplexed DAQ systems |
| Industry-standard pinout | Pin-compatible with legacy 8-pin voltage references (e.g., REF02, LT1021), enabling drop-in upgrades in existing designs |
Applications
| High-Resolution ADC Reference | Precision Current Source |
|---|---|
Use Scenario: 16-bit successive-approximation ADC in portable calibrator requiring <1LSB total error over temperature. IC Role / Device Role / Timing Role: Primary voltage reference establishing full-scale input range and offset null point. Use Value: 0.5ppm/°C tempco and 1.5µVp-p noise ensure <0.25LSB drift and <0.15LSB noise contribution at 2.5V FS. | Use Scenario: Programmable 4–20mA transmitter with 0.05% total error budget across -25°C to +70°C. IC Role / Device Role / Timing Role: Stable excitation source for precision resistor-to-current conversion circuitry. Use Value: ±0.02% initial accuracy and 30ppm/1000hr stability enable 5-year field calibration intervals without drift compensation. |
| ATE Equipment Reference | Digital Voltmeter Standard |
Use Scenario: Automated test system verifying 18-bit multimeter accuracy under varying line voltage and ambient conditions. IC Role / Device Role / Timing Role: Master reference for DAC-based stimulus generation and ADC-based measurement front-end. Use Value: 10ppm/V line regulation and ±15mA drive allow direct powering of multiple DACs while rejecting AC line ripple. | Use Scenario: Benchtop DVM requiring NIST-traceable 2.5V reference with <5ppm/year aging specification. IC Role / Device Role / Timing Role: Primary calibration standard referenced against external metrology lab standards. Use Value: 20ppm temperature hysteresis and 0.75ppm/°C typical tempco ensure repeatable readings after thermal cycling between storage and operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025AIDR | 2.5V, 3ppm/°C max tempco, 1.2µVp-p noise, SO-8 package only | Lacks TRIM and NR pins; requires external filter for same noise performance | Preferred where board space is constrained and trimming not required |
| LT1021DCN8-2.5 | 2.5V, 3ppm/°C max tempco, 2.0µVp-p noise, 8-pin PDIP package | No NR pin; limited to ±10mA output; higher 18ppm/1000hr drift | Suitable for cost-sensitive legacy designs with relaxed noise/stability requirements |
Compared with REF5025AIDR and LT1021DCN8-2.5, the MAX6325CPA+ uniquely combines trimmability, noise-reduction capability, and industry-standard DIP footprint - making it optimal for field-serviceable, high-accuracy instruments needing long-term calibration integrity and design flexibility.
Availability
MAX6325CPA+ is available at Aetrix Electronics and suitable for high-accuracy industrial process control, automated test equipment, and portable metrology instruments requiring stable component supply across extended product lifecycles.
Supply support for MAX6325CPA+ 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 and mixed-signal ICs for precision, power, and interface applications.
The MAX6325CPA+ belongs to Maxim's precision voltage reference product line, engineered specifically for metrology-grade instrumentation, calibration equipment, and high-resolution data acquisition systems demanding laboratory-level stability without ovenized complexity.
FAQ
What is the maximum operating temperature range for the MAX6325CPA+?
The MAX6325CPA+ is rated for operation from 0°C to +70°C. This commercial-grade temperature range is defined by its 'C' suffix in the ordering code and confirmed in the Absolute Maximum Ratings table. The device maintains all specified electrical characteristics-including 1ppm/°C max tempco and ±0.02% initial accuracy-across this full range. It is not qualified for extended industrial (-40°C to +85°C) or military (-55°C to +125°C) temperature grades, which correspond to MAX6325EPA/ESA and MAX6325MJA variants respectively.
Does the MAX6325CPA+ require an external capacitor on the NR pin?
No, the NR pin on the MAX6325CPA+ is optional. Leaving it open yields baseline 1.5µVp-p (0.1Hz–10Hz) noise performance. Adding a 1µF capacitor reduces wideband noise by ~20dB above 10Hz, but provides diminishing returns beyond that value per the Typical Operating Characteristics curves. The capacitor is recommended only when system-level noise budgets demand sub-1µVp-p in-band noise, such as in 18-bit+ digitizers or ultra-low-drift current sources.
Can the MAX6325CPA+ sink and source current simultaneously?
No-the MAX6325CPA+ operates in either sourcing or sinking mode, not both simultaneously. Its ±15mA rating means it can deliver up to +15mA from OUT to load (sourcing) or absorb up to -15mA from load into OUT (sinking), but the net current must remain within those bounds. Simultaneous sourcing and sinking would require two separate reference paths or a different topology; the MAX6325CPA+'s single-output architecture supports only unidirectional current flow at any given time.
Is the MAX6325CPA+ pin-compatible with other members of the MAX63xx family?
Yes-the MAX6325CPA+, MAX6341CPA+, and MAX6350CPA+ share identical 8-pin DIP pinouts, including IN, GND, NR, TRIM, and OUT assignments. This allows hardware reuse across 2.5V, 4.096V, and 5V reference variants in systems where output voltage selection is determined by firmware or external scaling. However, TRIM range and noise specifications differ per variant, so direct substitution requires verification of output voltage tolerance and noise bandwidth requirements.
What is the purpose of pins 1, 7, and 8 on the MAX6325CPA+?
Pins 1, 7, and 8 on the MAX6325CPA+ are internally connected (I.C.) and must remain unconnected on the PCB. These pins serve no external function and are not bonded to active circuitry. Connecting them risks introducing parasitic capacitance or ground loops that could degrade noise performance or thermal stability. The datasheet explicitly states "DO NOT USE" for these terminals, and they are omitted from functional schematics and layout guidelines.
MAX6325CPA+ 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:
- 1ppm/°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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX6325CPA+ FAQ
1.How can I place an order for MAX6325CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6325CPA+ 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 MAX6325CPA+ reliable?
The price and inventory of MAX6325CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6325CPA+ is usually 5 days.
3.What payment methods are accepted for MAX6325CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6325CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6325CPA+?
MAX6325CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6325CPA+ 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 MAX6325CPA+?
For technical support, including MAX6325CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6325CPA+ requirements.
6.How does Aetrix verify that MAX6325CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX6325CPA+ 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 MAX6325CPA+ meets industry standards.
7.What is the process for return or replacement of MAX6325CPA+?
All MAX6325CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6325CPA+, 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 MAX6325CPA+ part is unused and in its original packaging.
Return procedure for MAX6325CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6325CPA+ Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
