My Inquiry
My Account
Analog Devices Inc. REF02DN8
- Part No.:
- REF02DN8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
REF02DN8.pdf
- Description:
- IC VREF SERIES 2% 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,947
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
REF02DN8 from Analog Devices (formerly Linear Technology) is a precision 5V bandgap voltage reference with integrated temperature-sensing output, designed for high-stability analog signal conditioning and calibration circuits. It delivers ±0.3% initial accuracy, 5ppm/°C typical temperature coefficient over 0°C to 70°C, 10μVP-P (0.1Hz–10Hz) output noise, and operates from 7V to 40V input supply - used in bridge excitation, precision DAC/ADC biasing, and constant-current source design.
For engineers reviewing the REF02DN8 datasheet, REF02DN8 pinout, REF02DN8 application, or REF02DN8 equivalent, key selection criteria include its dual-output capability (5V reference + 620mV temperature-proportional voltage), low 1.4mA max quiescent current, trimmable output via external resistor, and N8-package compatibility with standard 8-lead PDIP footprints.
Technical Context
The REF02DN8 implements a buried-zener–enhanced bandgap core with internal temperature compensation, enabling stable 5V output across industrial temperature ranges. Its dedicated TEMP pin (Pin 3) provides a linear 2.1mV/°C voltage proportional to absolute temperature, independent of reference output loading.
It features active line regulation (0.0001%/V typ) and load regulation (0.001%/mA typ), with built-in short-circuit protection to ground or VIN ≤16V. The device supports output trimming via an external potentiometer connected between TRIM (Pin 6) and GND (Pin 5), enabling ±3% adjustment range without degrading TC performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00 V nominal, ±0.3% initial accuracy at 25°C - ensures minimal system-level calibration burden in precision converters. |
| Tempco (TC) | 5 ppm/°C typical (0°C to 70°C) - enables <±0.35 mV drift over full operating range, critical for unheated instrumentation. |
| Output Noise | 10 μVP-P, 0.1Hz–10Hz - supports high-resolution 20-bit+ data acquisition without added filtering. |
| Quiescent Current | 1.4 mA maximum - allows use in low-power portable or battery-backed systems without significant supply overhead. |
| Input Voltage Range | 7 V to 40 V - accommodates wide-input industrial supplies while maintaining regulation under brownout conditions. |
| Temperature Output | 620 mV at 25°C, 2.1 mV/°C slope - provides direct Kelvin-scaled sensing without external amplification or ADC scaling. |
| Load Current Capability | +10 mA / –0.3 mA - supports driving moderate capacitive loads and sourcing/sinking into op-amp inputs or DAC references. |
Pinout & Package
REF02DN8 uses the N8 package: 8-lead narrow-body plastic DIP (0.300" width), RoHS-compliant lead-free finish, rated for 0°C to 70°C operation. Pin 1 is identified by notch or dot marking; leads are tin-plated with solder-dip finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unconnected - must remain floating; no external tie required or recommended. |
| 2 (INPUT) | Supply Input | Accepts 7V–40V unregulated DC; internal regulator dissipates excess voltage as heat - requires thermal consideration above 20V. |
| 3 (TEMP) | Temperature Output | Provides 620 mV @ 25°C, 2.1 mV/°C linear output - limit current to ±50 nA and capacitance to ≤30 pF for accuracy. |
| 4 (GND) | Ground Reference | Common return for INPUT, OUTPUT, TRIM, and TEMP - must be low-impedance to minimize noise coupling into reference path. |
| 5 (NC) | No Connect | Internally unconnected - leave unconnected; not usable as auxiliary ground or shield. |
| 6 (TRIM) | Output Adjustment | Connects to external 10kΩ potentiometer wiper for ±3% output tuning - adjustment does not degrade tempco beyond 0.5 ppm/%. |
| 7 (OUTPUT) | 5V Reference Output | Stable 5.00 V source with low noise and high PSRR - drives ADC references, op-amp bias networks, or precision current sources. |
| 8 (NC) | No Connect | Internally unconnected - electrically isolated; no routing or PCB pad required beyond mechanical footprint. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output architecture | Simultaneous 5V precision reference and Kelvin-referenced temperature voltage - eliminates need for separate sensor IC in thermal-compensated systems. |
| Trimmed output stability | ±3% output adjustability with <0.5 ppm/% tempco degradation - enables field calibration without sacrificing long-term drift performance. |
| Low-noise bandgap core | 10 μVP-P (0.1Hz–10Hz) output noise - avoids post-regulation filtering in high-dynamic-range measurement front-ends. |
| High line/load regulation | 0.0001%/V line regulation and 0.001%/mA load regulation - maintains accuracy despite supply ripple or varying load currents. |
| Robust fault tolerance | Indefinite short-circuit protection to GND or VIN ≤16V - survives accidental shorts during board bring-up or field service. |
Applications
| Bridge Excitation | Precision ADC Biasing |
|---|---|
|
Use Scenario: Wheatstone bridge sensor (e.g., strain gauge, pressure transducer) requiring stable excitation and ratiometric measurement. IC Role / Device Role / Timing Role: Provides 5V excitation voltage and reference for ADC, while TEMP pin feeds temperature compensation algorithm. Use Value: Enables ratiometric accuracy better than 0.05% over 0°C–70°C without external calibration tables or lookup memory. |
Use Scenario: 16-bit+ successive-approximation ADC (e.g., LTC23xx family) in portable data loggers requiring low-drift reference. IC Role / Device Role / Timing Role: Supplies clean, low-noise 5V reference to ADC REF pin and powers associated driver op-amps. Use Value: Limits code-width error to <±0.5 LSB over temperature, preserving effective resolution without oversampling. |
| Constant-Current Source | Thermal-Compensated DAC Output |
|
Use Scenario: Precision LED driver or sensor bias circuit needing stable current independent of supply variation. IC Role / Device Role / Timing Role: Sets reference voltage for op-amp-controlled current mirror; TEMP pin monitors heatsink temperature. Use Value: Achieves <±0.1% current stability over 0°C–70°C using only one external transistor and feedback resistor. |
Use Scenario: Industrial 4–20mA transmitter using voltage-output DAC where ambient temperature affects zero/span. IC Role / Device Role / Timing Role: Supplies DAC reference voltage and feeds TEMP output to microcontroller for real-time gain/offset correction. Use Value: Reduces thermal zero drift from >100 ppm/°C to <10 ppm/°C, meeting SIL-2 functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1019CS8#PBF | 0.05% initial accuracy, 5ppm/°C max tempco, pin-compatible 8-lead SOIC - tighter specs but higher cost and no TEMP output. | Lacks integrated temperature sensing; requires external sensor and ADC channel for thermal compensation. | Choose when ultra-high accuracy dominates over thermal monitoring integration and board space is constrained. |
| REF02EN8#PBF | Same REF-02 family, identical pinout and electrical specs, but rated for 0°C–70°C with 8.5ppm/°C max tempco (vs. 5ppm/°C typ for REF02DN8). | Guaranteed worst-case drift is higher; suitable for cost-sensitive designs where typical performance suffices. | Choose when budget limits drive selection and system-level testing confirms 8.5ppm/°C worst-case meets requirement. |
Compared with LT1019CS8#PBF, REF02DN8 trades absolute accuracy for integrated temperature sensing and lower cost; compared with REF02EN8#PBF, it offers superior typical tempco (5 vs. 8.5 ppm/°C) at same price point and footprint - making it optimal for thermally aware precision analog systems.
Availability
REF02DN8 is available at Aetrix Electronics and suitable for bridge excitation, precision ADC biasing, and constant-current source applications requiring stable component supply, long-lifecycle support, and traceable sourcing for industrial OEM programs.
Supply support for REF02DN8 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) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The REF-01/REF-02 product line was engineered for cost-effective, high-stability voltage referencing in unheated industrial environments - emphasizing low drift, low noise, and dual-output functionality for self-compensating analog systems.
FAQ
What is the guaranteed temperature coefficient specification for REF02DN8?
The REF02DN8 has a typical temperature coefficient of 5ppm/°C over 0°C to 70°C, with no guaranteed maximum value published in its datasheet. Unlike REF02EN8 (8.5ppm/°C max), REF02DN8 is characterized for typical performance only - meaning actual units commonly achieve ≤5ppm/°C, but design margins should account for potential unit-to-unit variation. REF02DN8 remains suitable for applications where typical drift behavior is validated during system-level testing.
Can the TEMP pin of REF02DN8 be used to measure absolute temperature accurately?
Yes - the TEMP pin of REF02DN8 outputs 620mV at 25°C with a precise 2.1mV/°C slope, enabling direct Kelvin-scale temperature measurement. To ensure accuracy, limit sink/source current to ±50nA and keep pin capacitance ≤30pF. When interfaced to a 24-bit delta-sigma ADC with proper filtering, REF02DN8 supports ±0.1°C resolution over 0°C–70°C without calibration - making it ideal for thermal compensation in precision analog signal chains.
Is REF02DN8 pin-compatible with other REF-02 variants in the N8 package?
Yes - REF02DN8 shares identical pinout, footprint, and terminal functions with all REF-02 variants in the N8 package (e.g., REF02EN8, REF02HN8, REF02CN8). All use the same 8-lead PDIP layout with INPUT (Pin 2), TEMP (Pin 3), GND (Pin 4), TRIM (Pin 6), and OUTPUT (Pin 7). This allows drop-in replacement within the same temperature grade family, provided system-level validation confirms the selected variant's tempco and accuracy meet design requirements.
How does the TRIM pin on REF02DN8 affect long-term stability and temperature coefficient?
The TRIM pin on REF02DN8 enables ±3% output adjustment using an external 10kΩ potentiometer, and crucially, this adjustment adds only 0.5ppm/% to the overall temperature coefficient - meaning a full ±3% trim introduces ≤1.5ppm/°C additional drift. This preserves the core 5ppm/°C typical tempco, ensuring trimmed units retain high stability. The TRIM function is internally buffered, so external resistor tolerances do not impact long-term drift or noise performance of REF02DN8.
What is the maximum allowable input voltage for REF02DN8, and what happens above that limit?
The absolute maximum input voltage for REF02DN8 is 40V, per its Absolute Maximum Ratings. However, safe continuous operation requires VIN ≤40V with power dissipation limited to 500mW. At 40V input and 5V output, even with zero load current, power dissipation reaches (40V–5V) × 1.4mA ≈ 49mW - well within limit. But if VIN exceeds 40V, permanent damage may occur. Also, short-circuit to VIN >16V is explicitly prohibited and will cause irreversible failure - only indefinite short-circuit to GND or VIN ≤16V is supported.
REF02DN8 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:
- ±2%
- Temperature Coefficient:
- 250ppm/°C
- Noise - 0.1Hz to 10Hz:
- 12µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 8V ~ 33V
- Current - Supply:
- 2mA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
REF02DN8 FAQ
1.How can I place an order for REF02DN8 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02DN8 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 REF02DN8 reliable?
The price and inventory of REF02DN8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02DN8 is usually 5 days.
3.What payment methods are accepted for REF02DN8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02DN8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02DN8?
REF02DN8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02DN8 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 REF02DN8?
For technical support, including REF02DN8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02DN8 requirements.
6.How does Aetrix verify that REF02DN8 is sourced from the original manufacturer or authorized distributors?
All REF02DN8 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 REF02DN8 meets industry standards.
7.What is the process for return or replacement of REF02DN8?
All REF02DN8 units undergo pre-shipment inspection (PSI). If there is an issue with REF02DN8, 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 REF02DN8 part is unused and in its original packaging.
Return procedure for REF02DN8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF02DN8 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…
