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Analog Devices Inc. REF02EN8
- Part No.:
- REF02EN8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
REF02EN8.pdf
- Description:
- IC VREF SERIES 0.3% 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,270
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Product details
Overview
REF02EN8 from Analog Devices (formerly Linear Technology) is a precision 5V bandgap voltage reference with temperature output functionality, ±0.3% initial accuracy, 5ppm/°C typical temperature coefficient over 0°C to 70°C, and 10μVP-P (0.1Hz–10Hz) output noise. It serves as a stable excitation source in bridge circuits and high-accuracy analog signal chains for industrial sensing and data acquisition.
For engineers reviewing the REF02EN8 datasheet, REF02EN8 pinout, REF02EN8 application, or REF02EN8 equivalent, key selection criteria include its integrated temperature-sensing voltage output (620mV at 25°C), low 1.4mA max supply current, 7V to 40V input range, and N8-package compatibility with standard 8-lead PDIP footprints.
Technical Context
The REF02EN8 implements a two-terminal bandgap reference core with buffered output and dedicated temperature-sensing terminal (Pin 3), enabling simultaneous precision voltage reference and absolute temperature measurement without external components. Its architecture isolates reference loading from the temperature output path via internal routing.
It operates across 7V–40V input, delivers up to 10mA source / –0.3mA sink load current, and maintains line regulation of 0.0001%/V and load regulation of 0.001%/mA (typ) - critical for stable performance in varying supply and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V ±0.3% (4.985V–5.015V) - enables direct interface with 5V ADCs/DACs without gain calibration. |
| Tempco (0°C–70°C) | 5ppm/°C typ (8.5ppm/°C max) - ensures ≤0.35mV drift over full operating range, suitable for 16-bit systems. |
| Output Noise (0.1–10Hz) | 10μVP-P - supports high-resolution measurements in low-frequency sensor interfaces like strain gauges. |
| Temperature Output | 620mV at 25°C, +2.1mV/°C - provides ratiometric Kelvin-scale reading with no external scaling needed. |
| Supply Current | 1.4mA max - allows use in low-power portable instrumentation and battery-backed systems. |
| Input Voltage Range | 7V to 40V - accommodates wide-input industrial supplies and unregulated rails without external regulators. |
| Load Regulation | 0.001%/mA typ - maintains output stability under dynamic load changes in active filter or amplifier bias networks. |
Pinout & Package
REF02EN8 is housed in an 8-lead plastic DIP (N8 package), 0.300-inch width, with JEDEC MS-001 compliant footprint and through-hole mounting. Pin 1 is index-marked; Pins 1, 2, and 4 are internally connected NC terminals and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | Internally tied; floating connection avoids parasitic coupling or ground loops. |
| 2 | No Connect (NC) | Internally tied; prevents unintended feedback paths in high-impedance reference nodes. |
| 3 | Temperature Output | Provides linear 620mV @ 25°C, +2.1mV/°C; requires ≤50nA load and ≤30pF capacitance for accuracy. |
| 4 | No Connect (NC) | Internally tied; maintains symmetry and thermal uniformity across package body. |
| 5 | Input (VIN) | Accepts 7V–40V unregulated supply; internal regulator rejects >100dB line ripple above 10Hz. |
| 6 | Output (VOUT) | 5V precision reference output; capable of sourcing 10mA or sinking –0.3mA into load. |
| 7 | Trim | Adjusts output ±3% via external 10kΩ potentiometer; trim sensitivity is 0.5ppm/% change in tempco. |
| 8 | GND (Case) | Power and signal return; metal case connection improves thermal stability and EMI immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-function terminal | Pin 3 delivers calibrated temperature voltage (620mV @ 25°C) alongside main 5V reference - eliminates need for separate temperature sensor in bridge-based transducers. |
| Low-drift bandgap core | 5ppm/°C typical tempco over 0°C–70°C ensures <±0.35mV error across operating range - meets 16-bit system LSB requirements (for 5V FS). |
| High PSRR & line regulation | 0.0001%/V line regulation and >100dB supply ripple rejection enable direct use from noisy industrial power rails without pre-regulation. |
| Trim-adjustable output | ±3% output adjustment range via external potentiometer allows field calibration to compensate for system-level gain errors or aging drift. |
| Robust short-circuit protection | Indefinite short-to-ground or short-to-VIN ≤16V tolerance - survives accidental wiring faults during prototyping and field service. |
Applications
| Bridge Excitation | Precision Regulator Reference |
|---|---|
|
Use Scenario: Wheatstone bridge with strain gauge or pressure sensor in industrial weighing or structural monitoring. IC Role / Device Role / Timing Role: Provides stable 5V excitation and temperature compensation reference simultaneously. Use Value: Eliminates separate temperature sensor; 620mV temperature output enables real-time thermal drift correction of bridge output without additional signal conditioning. |
Use Scenario: High-stability 5V LDO reference in programmable logic controller (PLC) analog I/O modules. IC Role / Device Role / Timing Role: Sets precise output voltage for series-pass transistor bias and feedback divider network. Use Value: 5ppm/°C tempco and 10μVP-P noise ensure <±1 LSB error in 16-bit DAC-controlled outputs over temperature and time. |
| A/D and D/A Converter Reference | Constant Current Source Setpoint |
|
Use Scenario: Reference for 16-bit SAR ADC in medical patient monitor front-end. IC Role / Device Role / Timing Role: Supplies exact 5.000V reference to ADC VREF pin and DAC output buffer. Use Value: ±0.3% initial accuracy and low noise preserve ENOB >15.5 bits; temperature output monitors ambient sensor die temperature for self-calibration. |
Use Scenario: Setpoint generator for LED driver or electrochemical sensor bias current source. IC Role / Device Role / Timing Role: Defines reference voltage for op-amp-based Howland current source. Use Value: Low 1.4mA quiescent current minimizes self-heating error; trim pin enables fine-tuning to match current-sense resistor tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1019CN8#PBF | 0.05% initial accuracy, 5ppm/°C max tempco, pin-compatible 8-lead PDIP, but no temperature output pin. | Lacks integrated temperature sensing; requires external sensor for thermal compensation. | Choose when higher absolute accuracy is required and temperature monitoring is handled separately. |
| REF02HN8#PBF | Same electrical specs and pinout, but rated for –55°C to 125°C extended temperature range and TO-5 metal can packaging. | Supports military/aerospace environments; higher θJA (100°C/W vs. 130°C/W) improves thermal stability under sustained load. | Choose for operation beyond 70°C or where hermetic sealing and radiation tolerance are mandated. |
Compared with REF02EN8, LT1019CN8 offers tighter initial accuracy but removes temperature sensing capability, while REF02HN8 retains identical functionality with enhanced thermal ruggedness - making REF02EN8 optimal for cost-sensitive commercial-grade instrumentation requiring dual reference/temperature output in a single IC.
Availability
REF02EN8 is available at Aetrix Electronics and suitable for bridge excitation, precision regulator reference, and A/D converter reference applications requiring stable component supply, long-term calibration retention, and dual-function integration.
Supply support for REF02EN8 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 (acquired Linear Technology in 2017) designs high-performance analog, mixed-signal, and power management ICs for precision measurement and control systems.
The REF-01/REF-02 family was developed to deliver cost-effective, dual-output (voltage + temperature) references for industrial sensor signal conditioning, replacing discrete solutions with integrated reliability and reduced board space.
FAQ
What is the function of Pin 3 on the REF02EN8?
Pin 3 on the REF02EN8 is the temperature output terminal, delivering a linear voltage proportional to absolute temperature: 620mV at 25°C with a slope of +2.1mV/°C. This output is exclusive to the REF-02 variants and is not present on REF-01 devices. The REF02EN8 datasheet specifies strict limits - load current must not exceed ±50nA and capacitance must stay below 30pF - to preserve accuracy. This feature enables direct thermal compensation in bridge-based sensors without adding external components.
Can the REF02EN8 be used as a standalone 5V regulator?
No, the REF02EN8 is not a regulator but a precision voltage reference. It provides a highly stable 5.000V output with low drift and noise, but it lacks current-limiting, thermal shutdown, or pass-transistor control circuitry found in regulators. The REF02EN8 can source up to 10mA and sink –0.3mA, making it suitable only for biasing low-current analog circuitry (e.g., op-amp references, ADC/DAC VREF inputs). For regulated 5V power delivery, a dedicated LDO or switching regulator referenced *to* the REF02EN8 output would be required.
What does the "E" suffix in REF02EN8 indicate?
The "E" in REF02EN8 denotes the commercial temperature grade: 0°C to 70°C operating range. This is confirmed in the official ordering table, where REF02EN8#PBF is explicitly listed with "0°C to 70°C" under Temperature Range. The "N8" suffix identifies the 8-lead plastic DIP (PDIP) package per LTC drawing #05-08-1510. The "#PBF" suffix indicates lead-free finish. The REF02EN8 is not rated for extended or military temperature ranges - those require variants like REF02HN8 (–55°C to 125°C) or REF02AH (TO-5 metal can).
How does the REF02EN8 compare to the LT1019 in terms of pin compatibility?
The REF02EN8 and LT1019CN8#PBF share identical 8-lead PDIP (N8) pinouts and footprint, including matching VIN, VOUT, GND, TRIM, and NC pin assignments - making them physically interchangeable on PCBs designed for either device. However, the LT1019CN8 omits the temperature output function (no Pin 3 utility) and improves initial accuracy to 0.05% (vs. ±0.3%) and tempco to 5ppm/°C max (vs. 8.5ppm/°C max for REF02EN8). So while pin-compatible, they are not functionally drop-in replacements unless temperature sensing is unnecessary.
Is external trimming required for the REF02EN8 to achieve specified accuracy?
No, external trimming is optional. The REF02EN8 guarantees ±0.3% initial output accuracy (4.985V–5.015V) without any adjustment. The TRIM pin (Pin 7) enables ±3% output adjustment using a 10kΩ potentiometer - useful for system-level calibration to cancel errors from downstream components (e.g., ADC gain error, resistor tolerances) or to meet tighter custom specifications. Using the trim function does not degrade the 5ppm/°C tempco by more than 0.5ppm/%, as documented in the Electrical Characteristics table.
REF02EN8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- REF02
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.3%
- Temperature Coefficient:
- 8.5ppm/°C
- Noise - 0.1Hz to 10Hz:
- 10µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 7V ~ 40V
- Current - Supply:
- 1.4mA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
REF02EN8 FAQ
1.How can I place an order for REF02EN8 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02EN8 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 REF02EN8 reliable?
The price and inventory of REF02EN8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02EN8 is usually 5 days.
3.What payment methods are accepted for REF02EN8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02EN8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02EN8?
REF02EN8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02EN8 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 REF02EN8?
For technical support, including REF02EN8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02EN8 requirements.
6.How does Aetrix verify that REF02EN8 is sourced from the original manufacturer or authorized distributors?
All REF02EN8 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 REF02EN8 meets industry standards.
7.What is the process for return or replacement of REF02EN8?
All REF02EN8 units undergo pre-shipment inspection (PSI). If there is an issue with REF02EN8, 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 REF02EN8 part is unused and in its original packaging.
Return procedure for REF02EN8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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