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Analog Devices Inc. REF02HH
- Part No.:
- REF02HH
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-205-8, TO-5-8 Metal Can
- Datasheet:
-
REF02HH.pdf
- Description:
- IC VREF SERIES 5V TO-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,524
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Product details
Overview
REF02HH from Analog Devices (formerly Linear Technology) is a precision 5V bandgap voltage reference with temperature-sensing capability, housed in an 8-lead TO-5 metal can package. 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 includes a dedicated temperature output pin (620mV at 25°C, +2.1mV/°C). It is used in high-stability bridge excitation circuits requiring simultaneous precision voltage and temperature monitoring.
For engineers reviewing the REF02HH datasheet, REF02HH pinout, REF02HH application, or REF02HH equivalent, key selection criteria include its guaranteed 0°C to 70°C operating range, low 1.4mA max supply current, trimmable output (±3%), and integrated temperature voltage output - all critical for calibrated sensor front-ends and metrology-grade analog signal chains.
Technical Context
The REF02HH implements a thermally compensated bandgap core with internal trimming to achieve tight initial tolerance and low drift. Its temperature output is generated by a separate, factory-calibrated circuit referenced to absolute temperature, delivering 620mV at 25°C with ±2.1mV/°C linearity across the full operating range.
It features dual regulation paths: one for the main 5V reference output (load current up to +20mA / –0.3mA), and another for the temperature output (pin 3), which must be limited to ±50nA bias current and ≤30pF capacitance to preserve accuracy and stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V nominal, ±0.3% initial accuracy (4.985V to 5.015V) - enables direct use in 12-bit ADC/DAC systems without external calibration. |
| Tempco | 5ppm/°C typical (8.5ppm/°C max over 0°C–70°C) - ensures ≤0.45mV drift across industrial ambient range, critical for stable gain-setting networks. |
| Noise (0.1–10Hz) | 10μVP-P - supports sub-16-bit resolution in precision weigh-scale and strain-gauge amplifiers without added filtering. |
| Supply Current | 1.4mA maximum - allows operation from low-power LDOs or battery-backed supplies in portable instrumentation. |
| Temperature Output | 620mV at 25°C, +2.1mV/°C - provides ratiometric temperature sensing without external components; usable for thermal compensation of sensor offset/gain. |
| Input Voltage Range | 7V to 40V - accommodates wide input rails including unregulated 12V or 24V industrial supplies with margin for ripple. |
| Load Regulation | 0.001%/mA typical (0–10mA) - maintains output stability under varying DAC load or op-amp bias conditions. |
Pinout & Package
REF02HH is packaged in an 8-lead TO-5 metal can (H package), hermetically sealed with a 0.230-inch pin circle diameter. The case serves as GND (pin 4), providing low-inductance grounding and EMI shielding essential for noise-sensitive references.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | Internally tied; must remain floating - connecting risks output instability or damage. |
| 2 | INPUT | Positive supply input (7–40V); requires local 0.1μF ceramic bypass to GND (pin 4) for PSRR optimization. |
| 3 | TEMP | Temperature-sensing output (620mV @ 25°C); must be loaded with ≤50nA and ≤30pF to avoid gain/offset error. |
| 4 | GND (CASE) | Metal case ground; solder directly to PCB ground plane for lowest noise and thermal resistance (θJA = 150°C/W). |
| 5 | TRIM | Output adjustment node; connects to external 10kΩ potentiometer for ±3% fine-tuning of 5V output. |
| 6 | OUTPUT | 5V precision reference output; capable of sourcing up to 20mA or sinking up to 0.3mA. |
| 7 | NC | Internally connected; no external connection permitted. |
| 8 | NC | Internally connected; no external connection permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output functionality | Simultaneous 5V reference and linear temperature voltage output enable single-component sensor biasing and thermal compensation in bridge-based transducers. |
| Low-drift bandgap core | 5ppm/°C typical tempco ensures <0.15mV output shift over 0–70°C ambient, eliminating need for system-level recalibration in field-deployed equipment. |
| Trimmed initial accuracy | ±0.3% output tolerance reduces or eliminates post-assembly trimming steps in production test, lowering manufacturing cost. |
| Hermetic TO-5 packaging | Metal-can enclosure provides superior long-term stability, moisture immunity, and EMI rejection versus plastic packages - critical for aerospace and medical applications. |
| Low-noise architecture | 10μVP-P (0.1–10Hz) enables direct interface with high-resolution sigma-delta ADCs without additional noise-filtering stages. |
Applications
| Strain Gauge Bridge Excitation | Precision DAC Reference |
|---|---|
|
Use Scenario: Full-bridge strain gauge in load cell or pressure transducer, powered from a single 15V rail. IC Role / Device Role / Timing Role: REF02HH supplies matched excitation voltage (5V) to bridge top and bottom legs while simultaneously feeding temperature compensation circuitry via its TEMP pin. Use Value: Eliminates need for separate reference and temperature sensor, reducing BOM count and board area; 5ppm/°C drift ensures <0.01% full-scale error contribution over temperature. |
Use Scenario: 16-bit voltage-output DAC in automated test equipment requiring stable, low-noise reference. IC Role / Device Role / Timing Role: REF02HH serves as the DAC's external VREF input, with its TRIM pin adjusted to match system gain calibration target. Use Value: 10μVP-P noise and 0.001%/mA load regulation prevent code-dependent output errors and maintain monotonicity across full DAC range. |
| Calibrated Thermocouple Amplifier | Industrial Current Loop Transmitter |
|
Use Scenario: Cold-junction compensation circuit for K-type thermocouple measurement in process control panel. IC Role / Device Role / Timing Role: REF02HH's TEMP pin provides absolute temperature reading; its OUTPUT pin sets reference for cold-junction amplifier gain stage. Use Value: Integrated temperature sensing avoids external sensor placement errors and matching drift; 2.1mV/°C slope simplifies analog cold-junction compensation math. |
Use Scenario: 4–20mA transmitter with HART modulation, powered from 24V loop supply. IC Role / Device Role / Timing Role: REF02HH establishes precise 5V reference for current-sense amplifier and microcontroller ADC, while its low 1.4mA quiescent current minimizes loop burden. Use Value: Enables full 4–20mA compliance with ≥12V headroom at 24V supply; ±0.3% accuracy ensures <0.05mA absolute current error at 20mA full scale. |
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, SO-8 package, no temperature output. | Higher accuracy but lacks integrated temperature sensing; requires external sensor for thermal compensation. | Choose when ultimate voltage accuracy is prioritized over temperature integration and board space is constrained. |
| REF02EH#PBF | Same electrical specs and pinout, but rated for 0°C to 70°C in TO-5 can with lead-free finish (vs. REF02HH's legacy finish). | Identical functional behavior; differs only in RoHS compliance and marking - suitable for new designs requiring lead-free assembly. | Choose REF02EH#PBF for new production where lead-free compliance is mandatory; REF02HH remains valid for legacy repair or non-RoHS environments. |
Compared with LT1019CS8#PBF, REF02HH trades 0.25% absolute accuracy for integrated temperature sensing and TO-5 robustness; compared with REF02EH#PBF, it shares identical performance but uses legacy tin-lead finish - making REF02HH appropriate for maintenance of existing hardware where Pb-free rework is not required.
Availability
REF02HH is available at Aetrix Electronics and suitable for precision data acquisition, industrial sensor conditioning, and calibrated instrumentation requiring stable component supply with long-lifecycle support.
Supply support for REF02HH 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 and maintains its precision analog portfolio, renowned for high-performance voltage references, amplifiers, and power management ICs.
The REF-01/REF-02 family was designed specifically for applications demanding stable, low-drift, low-noise voltage references with optional temperature telemetry - targeting industrial measurement, test equipment, and sensor signal chains where long-term calibration integrity is essential.
FAQ
What is the operating temperature range for REF02HH?
The REF02HH is specified for operation from 0°C to 70°C. This range is explicitly guaranteed per the manufacturer's ordering information table, where REF02HH#PBF is listed under "0°C to 70°C" temperature grade in the H-package (TO-5 metal can) column. It is not rated for extended industrial (–40°C to +85°C) or military (–55°C to +125°C) ranges.
Can the TEMP pin of REF02HH be used to drive an ADC input directly?
Yes, the TEMP pin of REF02HH outputs 620mV at 25°C with a linear +2.1mV/°C coefficient and can interface directly with a high-impedance ADC input. However, the datasheet mandates limiting bias current to ±50nA and capacitance to ≤30pF - so a unity-gain buffer or high-R input divider with guard traces is recommended to preserve accuracy and avoid self-heating errors in REF02HH.
Is REF02HH pin-compatible with REF02EH#PBF?
Yes, REF02HH and REF02EH#PBF share identical pin configuration, electrical specifications, and TO-5 metal can package dimensions. The only differences are finish (tin-lead vs. lead-free) and part marking; both are drop-in replacements in existing PCB layouts with no modifications required.
What is the maximum load current REF02HH can source on its OUTPUT pin?
The REF02HH can source up to 20mA on its OUTPUT pin, as confirmed in the Electrical Characteristics table under "IOUT Load Current (Sink Current)" with "20 mA" listed in the MAX column for REF-02H. This rating applies across the full 0°C to 70°C operating range and supports driving moderate loads such as op-amp bias networks or small DAC reference inputs.
Does REF02HH require external capacitors for stability?
Yes, REF02HH requires a minimum 0.1μF ceramic capacitor between INPUT (pin 2) and GND (pin 4) for power supply decoupling and PSRR enhancement. No output capacitor is mandated, but a 1nF–10nF capacitor may be added at the OUTPUT pin to reduce high-frequency noise if interfacing with sensitive ADCs - provided layout avoids ground loops and maintains low-inductance GND return paths.
REF02HH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- TO-205-8, TO-5-8 Metal Can
- Series:
- REF02
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-5
REF02HH FAQ
1.How can I place an order for REF02HH through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02HH 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 REF02HH reliable?
The price and inventory of REF02HH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02HH is usually 5 days.
3.What payment methods are accepted for REF02HH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02HH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02HH?
REF02HH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02HH 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 REF02HH?
For technical support, including REF02HH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02HH requirements.
6.How does Aetrix verify that REF02HH is sourced from the original manufacturer or authorized distributors?
All REF02HH 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 REF02HH meets industry standards.
7.What is the process for return or replacement of REF02HH?
All REF02HH units undergo pre-shipment inspection (PSI). If there is an issue with REF02HH, 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 REF02HH part is unused and in its original packaging.
Return procedure for REF02HH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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