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Analog Devices Inc./Maxim Integrated REF02EP+
- Part No.:
- REF02EP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
REF02EP+.pdf
- Description:
- IC VREF SERIES 0.3% 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,571
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Product details
Overview
REF02EP+ from Maxim Integrated is a precision +5V voltage reference IC with TEMP pin for linear temperature sensing, 8.5ppm/°C max temperature coefficient, ±15mV initial output error, and 10µVP-P (0.1Hz–10Hz) low-noise performance - used in high-accuracy ADC/DAC calibration and temperature-compensated instrumentation.
For engineers reviewing the REF02EP+ datasheet, REF02EP+ pinout, REF02EP+ application, or REF02EP+ equivalent, this page delivers verified electrical specs, package mapping to 8-pin Plastic DIP (P8-2), confirmed TEMP pin functionality, and validated alternatives for 5V reference design continuity.
Technical Context
The REF02EP+ implements a bandgap-based voltage reference core with internal trimming for factory-set 5.000V output and a dedicated TEMP pin delivering 630mV at +25°C with 2.1mV/°C linear slope. It operates from 7V to 33V single supply and supports ±6% output adjustment via external 10kΩ potentiometer without degrading temperature stability.
Its architecture integrates short-circuit protection, 1mA quiescent current, and 230µs turn-on settling time to ±0.1%. The device is specified over 0°C to +70°C and guarantees ≤8.5ppm/°C TCVO across that range - matching REF02E-grade performance in lead-free plastic DIP packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.985V to 5.015V at +25°C, IL = 0 - ensures binary-compatible 5.000V reference with <±3mV deviation before trimming. |
| Tempco (Max) | 8.5ppm/°C over 0°C to +70°C - limits worst-case drift to ±0.6mV across full operating range. |
| Initial Error | ±15mV at +25°C - enables system-level calibration with minimal trim range required. |
| Output Noise | 10µVP-P, 0.1Hz–10Hz - preserves SNR in 16-bit+ data converters without added filtering. |
| TEMP Pin Output | 630mV @ +25°C, 2.1mV/°C slope - provides direct Kelvin-scaled analog temperature signal with ±0.5°C accuracy potential. |
| Supply Range | 7V to 33V single supply - supports operation from standard 9V batteries up to industrial 24V rails. |
| Quiescent Current | 1.0mA to 1.4mA - enables low-power portable instrumentation without sacrificing reference stability. |
Pinout & Package
REF02EP+ is housed in an 8-pin Plastic Dual-In-Line Package (P8-2), compliant with JEDEC MS-001, with 0.3" wide body and 0.1" pin pitch. Lead-free (RoHS-compliant) finish per + suffix designation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Reference Output | Stable +5V precision output; capable of sourcing up to 10mA and sinking 0.3mA while maintaining spec. |
| 2 - TRIM | Output Adjustment | Connects to wiper of 10kΩ potentiometer to adjust output ±6% (±300mV); minimal impact on tempco (0.7ppm/%). |
| 3 - TEMP | Temperature Transducer | Linear analog output proportional to absolute temperature: VT = 2.1 × (T + 273) mV; requires ≤50nA load and ≤30pF capacitance. |
| 4 - GND | Analog Ground | Primary ground return for reference core and TEMP circuitry; must be star-connected to minimize noise coupling. |
| 5 - VIN | Input Supply | DC input pin accepting 7V–33V; internal regulation rejects line ripple; short-circuit protected to ground or VIN. |
| 6 - NC | No Connection | Internally unconnected; must remain floating - not tied to GND, VIN, or any other node. |
| 7 - NC | No Connection | Internally unconnected; must remain floating - no routing or soldering recommended. |
| 8 - NC | No Connection | Internally unconnected; unused pin per REF02 pinout; leave unconnected per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Pretrimmed +5V output | Factory-set to 5.000V ±15mV at +25°C - eliminates need for post-manufacture calibration in most applications. |
| Integrated TEMP transducer | Monolithic temperature sensor with 2.1mV/°C scale factor and 630mV offset - replaces discrete thermistor+op-amp circuits. |
| Low 0.1Hz–10Hz noise | 10µVP-P - enables direct interface to high-resolution sigma-delta ADCs without external filtering. |
| Adjustable output (±6%) | TRIM pin allows precise system-level correction of gain/offset errors - e.g., setting 5.000V for 12-bit DAC full-scale. |
| Short-circuit protected | Indefinite short to GND or VIN - ensures robustness during board bring-up and fault conditions. |
Applications
| High-Accuracy Data Acquisition | Digital Multimeter Front-End |
|---|---|
|
Use Scenario: 16-bit SAR ADC system requiring stable reference for sub-LSB accuracy over temperature. IC Role / Device Role / Timing Role: Primary voltage reference source and temperature monitor for self-calibration routines. Use Value: 8.5ppm/°C tempco and 10µVP-P noise ensure <±0.5 LSB error contribution across 0°C–70°C. |
Use Scenario: Portable handheld DMM measuring DC voltage with auto-ranging and auto-zero functions. IC Role / Device Role / Timing Role: Dual-function reference: 5V reference for ADC and TEMP pin for ambient temperature compensation. Use Value: Eliminates separate temperature sensor; 630mV @ 25°C enables accurate zero-drift correction without lookup tables. |
| Industrial Sensor Signal Conditioning | Calibration Equipment Reference |
|
Use Scenario: 4–20mA transmitter with local temperature compensation for RTD or strain gauge bridges. IC Role / Device Role / Timing Role: Precision excitation reference and local temperature sensing node. Use Value: Single-device solution reduces BOM count; TEMP pin output directly interfaces to microcontroller ADC for real-time compensation. |
Use Scenario: Benchtop calibration source verifying multimeters, process calibrators, and DAQ modules. IC Role / Device Role / Timing Role: Stable, adjustable 5V reference with traceable tempco for metrology-grade verification. Use Value: ±15mV initial error and ±6% trim range support NIST-traceable 5.000V setup; 230µs settling enables fast automated test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar +5V precision reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF02HSA+ | Same electrical specs but in 8-pin SOIC (S8-2); 25ppm/°C max tempco vs. 8.5ppm/°C for REF02EP+. | Suitable for space-constrained PCBs where DIP footprint is unacceptable; trade-off is higher tempco. | Select REF02HSA+ only if SOIC packaging is mandatory and ±25ppm/°C drift is acceptable in target environment. |
| MAX6035AESA+ | Lower 10ppm/°C max tempco, 3.3V fixed output, SOT23-3 package; no TEMP pin or trim capability. | Designed for low-voltage, low-pin-count systems; lacks temperature sensing and adjustability of REF02EP+. | Choose MAX6035AESA+ when 3.3V reference suffices, board area is critical, and temperature monitoring is handled separately. |
Compared with REF02HSA+ and MAX6035AESA+, REF02EP+ uniquely combines DIP-mounting, 5V output, ±6% trim, and integrated TEMP transducer - making it irreplaceable in legacy calibration hardware and dual-role sensor designs where SOIC or fixed-voltage alternatives cannot replicate its functional scope.
Availability
REF02EP+ is available at Aetrix Electronics and suitable for high-accuracy data acquisition, portable digital multimeters, and industrial sensor signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for REF02EP+ 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 precision analog, mixed-signal, and power management ICs for industrial, medical, and test equipment markets.
The REF02 product line was designed specifically for applications demanding stable, low-noise, multi-function voltage references - especially where integrated temperature sensing and output adjustability reduce system complexity.
FAQ
What is the guaranteed temperature coefficient specification for REF02EP+?
The REF02EP+ has a maximum temperature coefficient of 8.5ppm/°C over the 0°C to +70°C operating range, as specified in the REF02E-grade electrical characteristics table. This value is measured as ∆VOT divided by temperature range and is production-tested at +25°C, with performance guaranteed by design across the full range. REF02EP+ meets this spec consistently due to its factory-trimmed bandgap core and P8-2 package thermal profile.
Does REF02EP+ include a temperature sensing function, and how is it implemented?
Yes, REF02EP+ includes a dedicated TEMP pin (Pin 3) that outputs a voltage linearly proportional to absolute temperature: VT = 2.1 × (T + 273) mV. At +25°C, this equals 630mV, with ±0.5°C typical accuracy. The pin must be loaded with ≤50nA and ≤30pF to maintain linearity. This feature is intrinsic to all REF02 variants including REF02EP+, distinguishing it from REF01 which has NC at Pin 3.
Can the output voltage of REF02EP+ be adjusted, and what is the adjustment range?
Yes, the output voltage of REF02EP+ can be adjusted using the TRIM pin (Pin 2) with an external 10kΩ potentiometer, enabling ±6% (±300mV) adjustment around the nominal 5.000V output. This adjustment does not significantly degrade temperature stability - the tempco shift is limited to 0.7ppm/°C per 100mV of adjustment. The circuit configuration matches the Typical Operating Circuit shown in the REF02 datasheet.
What is the maximum load current REF02EP+ can drive while maintaining output accuracy?
REF02EP+ guarantees output voltage accuracy up to 10mA source current and 0.3mA sink current under specified conditions (VIN = 15V, TA = +25°C). At full 10mA load, line and load regulation contribute ≤0.010%/mA, resulting in <±0.1mV deviation. Derating applies above +36°C per the 5.6mW/°C thermal derating curve for the P8-2 package, limiting continuous dissipation to 500mW.
Is REF02EP+ RoHS-compliant and lead-free?
Yes, REF02EP+ is RoHS-compliant and features a lead-free finish, as indicated by the "+" suffix in the part number per Maxim's ordering nomenclature. The P8-2 package uses matte tin plating over copper leadframe, qualified to JEDEC J-STD-020 moisture sensitivity level 1, and compatible with standard Pb-free reflow profiles. Full compliance documentation is available in Maxim's official package reports.
REF02EP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- REF02
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 21 mA
- Tolerance:
- ±0.3%
- Temperature Coefficient:
- 8.5ppm/°C
- Noise - 0.1Hz to 10Hz:
- 10µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 8V ~ 33V
- Current - Supply:
- 1.4mA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
REF02EP+ FAQ
1.How can I place an order for REF02EP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02EP+ 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 REF02EP+ reliable?
The price and inventory of REF02EP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02EP+ is usually 5 days.
3.What payment methods are accepted for REF02EP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02EP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02EP+?
REF02EP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02EP+ 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 REF02EP+?
For technical support, including REF02EP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02EP+ requirements.
6.How does Aetrix verify that REF02EP+ is sourced from the original manufacturer or authorized distributors?
All REF02EP+ 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 REF02EP+ meets industry standards.
7.What is the process for return or replacement of REF02EP+?
All REF02EP+ units undergo pre-shipment inspection (PSI). If there is an issue with REF02EP+, 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 REF02EP+ part is unused and in its original packaging.
Return procedure for REF02EP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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