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Analog Devices Inc. REF02AZ
- Part No.:
- REF02AZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
REF02AZ.pdf
- Description:
- IC VREF SERIES 0.3% 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,429
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Product details
Overview
REF02AZ from Analog Devices is a precision 5.0 V voltage reference IC in an 8-lead CERDIP (Z-suffix) package, delivering ±0.3% initial accuracy, 8.5 ppm/°C max temperature coefficient, 15 µVp-p (0.1–10 Hz) low-frequency noise, 1.4 mA max quiescent current, and 10 mA load-driving capability. It serves as a stable analog reference in high-resolution ADC/DAC signal chains for industrial process control systems.
For engineers reviewing the REF02AZ datasheet, REF02AZ pinout, REF02AZ application, or REF02AZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The REF02AZ implements a laser-trimmed band gap core with PTAT and CTAT voltage generation, enabling stable 5.0 V output across −55°C to +125°C (A-grade). Its internal op amp and feedback network (R5/R6) set precise output while minimizing curvature error.
It features dual auxiliary terminals: TRIM for ±3% output adjustment via external potentiometer, and TEMP for direct band gap voltage sensing (580 mV @ 25°C, 1.96 mV/°C slope), supporting on-chip temperature monitoring without external sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V nominal; maintains ±0.3% accuracy over initial calibration (±15 mV), critical for 16-bit+ converter offset budgeting. |
| Temp Coefficient | ≤8.5 ppm/°C (−55°C to +125°C); contributes ≤0.43 mV drift over full range, enabling stable operation in uncontrolled environments. |
| Voltage Noise | 15 µVp-p (0.1–10 Hz); low enough to avoid degrading SNR in 20-bit SAR ADCs with ≥1 MSPS sampling. |
| Supply Range | 7.0 V to 36 V; supports wide-input industrial power rails while maintaining regulation down to 2 V dropout. |
| Load Drive | 10 mA sourcing capability; sufficient to drive multiple op amp references or ADC reference inputs without buffering. |
| Quiescent Current | 1.4 mA max; enables low-power precision reference use in battery-backed instrumentation with <14 mW dissipation at 10 V input. |
Pinout & Package
REF02AZ is housed in an 8-lead CERDIP (Z-suffix) package - hermetically sealed, ceramic dual-in-line with glass-metal seals, rated for −55°C to +125°C operation and suitable for high-reliability military/aerospace applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8 | NC (No Connect) | Internally unconnected; must remain floating or tied to GND per datasheet - not reserved for future function. |
| 2 | VIN | Unregulated input supply; accepts 7–36 V; requires ≥0.1 µF local ceramic decoupling for stability. |
| 3 | TEMP | Direct band gap voltage output (580 mV @ 25°C, 1.96 mV/°C); used for temperature sensing or compensation, not buffered. |
| 4 | GND | Analog ground reference; must be star-connected to minimize noise coupling into reference node. |
| 5 | TRIM | Adjustment node for ±3% output tuning; connects to center tap of 10 kΩ potentiometer between VOUT and GND. |
| 6 | VOUT | Stable 5.0 V reference output; capable of sourcing 10 mA; requires 0.1 µF ceramic capacitor directly at pin for optimal noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed band gap core | Enables ±0.3% initial accuracy and ≤8.5 ppm/°C tempco without external calibration. |
| Integrated TEMP terminal | Provides factory-calibrated 1.96 mV/°C analog temperature output - eliminates need for discrete sensor in thermal monitoring circuits. |
| TRIM-adjustable output | Supports ±3% fine-tuning to compensate for PCB trace resistance, solder reflow shift, or system-level gain errors. |
| Wide supply range (7–36 V) | Operates directly from unregulated industrial 12 V or 24 V rails, reducing need for pre-regulation stages. |
| Hermetic CERDIP packaging | Ensures long-term parameter stability and moisture resistance in harsh environments (e.g., avionics, downhole tools). |
Applications
| Industrial Process Control | Precision Data Acquisition |
|---|---|
Use Scenario: 4–20 mA loop-powered transmitter with integrated 24-bit ΣΔ ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC and DAC sections, establishing absolute measurement scale. Use Value: 8.5 ppm/°C tempco ensures <±0.01% full-scale error over −40°C to +85°C ambient, meeting SIL-2 field instrument requirements. |
Use Scenario: Portable handheld multimeter with auto-ranging and true RMS conversion. IC Role / Device Role / Timing Role: Stable 5.0 V reference for dual-slope integrator and comparator thresholds. Use Value: 15 µVp-p low-frequency noise prevents digitization artifacts in sub-mV DC measurements. |
| Military/Aerospace Avionics | High-Resolution Sensor Conditioning |
Use Scenario: Inertial measurement unit (IMU) with MEMS gyros and accelerometers. IC Role / Device Role / Timing Role: Reference source for analog front-end PGA and anti-aliasing filters. Use Value: Hermetic CERDIP package and −55°C to +125°C rating support operation across aircraft flight envelope without derating. |
Use Scenario: Strain-gauge bridge amplifier with 20-bit ADC in structural health monitoring. IC Role / Device Role / Timing Role: Excitation and reference voltage source for ratiometric bridge measurement. Use Value: TRIM terminal allows post-calibration adjustment to null out bridge offset and achieve <10 ppm linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR02ARZ | 5.0 V output, ±0.1% initial accuracy, 3 ppm/°C max tempco, 8-lead SOIC package (not hermetic). | Higher accuracy and lower drift, but plastic SOIC limits use in extended temperature or high-reliability mil-aero contexts. | Select ADR02ARZ when ultimate stability is required and hermeticity is not mandated; REF02AZ remains preferred for legacy CERDIP-requiring designs. |
| REF5050AID | 5.0 V output, ±0.05% initial accuracy, 3 ppm/°C max tempco, 8-lead SOIC, includes enable pin and improved PSRR. | Offers shutdown control and better supply rejection, but lacks TEMP terminal and hermetic packaging. | Choose REF5050AID for new designs needing ultra-low drift and power management; REF02AZ retains value where on-chip temperature sensing or CERDIP reliability is essential. |
Compared with ADR02ARZ and REF5050AID, REF02AZ uniquely combines hermetic CERDIP packaging, integrated temperature sensing (TEMP pin), and proven long-term stability in high-stress environments - making it irreplaceable in aerospace, defense, and downhole applications where alternatives lack equivalent qualification or functionality.
Availability
REF02AZ is available at Aetrix Electronics and suitable for industrial process control, precision data acquisition, and military/aerospace avionics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for REF02AZ 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The REF02 series belongs to Analog Devices' precision voltage reference product line, engineered specifically for applications demanding low drift, high accuracy, and robustness in industrial, military, and aerospace instrumentation.
FAQ
What is the operating temperature range for REF02AZ?
The REF02AZ is specified for −55°C to +125°C operation (A-grade), with guaranteed performance including ±0.3% initial accuracy and ≤8.5 ppm/°C temperature coefficient across that full range. This makes REF02AZ suitable for extreme-environment applications such as avionics, oilfield tools, and space-qualified subsystems where commercial-grade references would fail.
Does REF02AZ require external capacitors for stable operation?
Yes - REF02AZ functions stably without external components, but a 0.1 µF ceramic capacitor placed directly at the VOUT pin is highly recommended to suppress low-frequency noise and improve transient response. An additional 1–10 µF bulk capacitor may be added in parallel for enhanced load-step immunity, though it increases turn-on settling time. Input capacitance (0.1 µF ceramic + 1–10 µF bulk) is also advised for noisy supply rails.
Can the TEMP pin on REF02AZ be used for accurate temperature measurement?
Yes - the TEMP pin delivers a factory-characterized band gap voltage of 580 mV at 25°C with a linear 1.96 mV/°C slope. When measured with a 16-bit ADC and calibrated at two points, it achieves ±1.5°C accuracy over −55°C to +125°C. REF02AZ's TEMP output is unbuffered and intended for ratiometric or differential sensing - not direct connection to high-impedance loads.
What is the maximum load current REF02AZ can source?
REF02AZ can continuously source up to 10 mA while maintaining output regulation within specifications. At 10 mA load and 25°C, dropout voltage remains ≤2 V, allowing operation from as low as 7 V input. Sinking capability is limited to −0.3 mA; the device is not designed for sink-heavy configurations like active pull-down networks.
How does the TRIM terminal on REF02AZ function in practice?
The TRIM terminal enables ±3% output adjustment using a 10 kΩ potentiometer wired between VOUT and GND, with wiper connected to TRIM. This allows post-assembly correction of system-level errors - e.g., PCB trace resistance, solder-induced offset, or gain mismatch in downstream amplifiers. Adjustment does not degrade temperature performance if low-TCR resistors are used in the trim network.
REF02AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Series:
- REF02
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.3%
- Temperature Coefficient:
- 8.5ppm/°C
- Noise - 0.1Hz to 10Hz:
- 15µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 8V ~ 36V
- Current - Supply:
- 1.4mA
- Current - Cathode:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
REF02AZ FAQ
1.How can I place an order for REF02AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02AZ 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 REF02AZ reliable?
The price and inventory of REF02AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02AZ is usually 5 days.
3.What payment methods are accepted for REF02AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02AZ?
REF02AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02AZ 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 REF02AZ?
For technical support, including REF02AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02AZ requirements.
6.How does Aetrix verify that REF02AZ is sourced from the original manufacturer or authorized distributors?
All REF02AZ 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 REF02AZ meets industry standards.
7.What is the process for return or replacement of REF02AZ?
All REF02AZ units undergo pre-shipment inspection (PSI). If there is an issue with REF02AZ, 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 REF02AZ part is unused and in its original packaging.
Return procedure for REF02AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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