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Analog Devices Inc./Maxim Integrated REF02CSA+
- Part No.:
- REF02CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF02CSA+.pdf
- Description:
- IC VREF SERIES 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:680
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Product details
Overview
REF02CSA+ from Maxim Integrated is a precision 5V voltage reference with integrated linear temperature transducer output (TEMP pin), designed for high-accuracy analog systems requiring stable excitation and thermal monitoring. It delivers ±50mV initial accuracy, 65ppm/°C max temperature coefficient over 0°C to +70°C, 10µVP-P (0.1Hz–10Hz) output noise, and operates from 7V to 33V input supply - used in precision ADC/DAC calibration, digital voltmeters, and temperature-sensing front-ends.
For engineers reviewing the REF02CSA+ datasheet, REF02CSA+ pinout, REF02CSA+ application, or REF02CSA+ equivalent, key selection criteria include its dual-function 5V reference + temperature-voltage output (630mV at 25°C, 2.1mV/°C slope), SO-8 package compatibility, trim-adjustable ±6% output range, and guaranteed short-circuit protection without derating.
Technical Context
The REF02CSA+ integrates a bandgap-based 5V reference core with a dedicated TEMP pin that outputs a voltage linearly proportional to absolute temperature (VT = 2.1 × (T + 273) mV). Its trim terminal allows ±300mV adjustment of the main output without degrading temperature stability beyond 0.7ppm/°C per 100mV shift.
It supports single-supply operation from 7V to 33V, draws only 1.0–1.4mA quiescent current, and maintains ±0.01%/V line regulation and ±0.01%/mA load regulation across its full operating range - enabling direct use in low-power, wide-input industrial sensor signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.975V to 5.025V at 25°C (±0.5% tolerance); enables direct interface with 5V logic and 12-/16-bit ADCs without scaling. |
| Tempco (Max) | 65ppm/°C over 0°C to +70°C; ensures ≤3.25mV total drift across industrial ambient range - critical for <0.1% system accuracy. |
| Initial Accuracy | ±50mV (±1.0%) at 25°C; allows system-level trimming via external 10kΩ potentiometer on TRIM pin. |
| Output Noise | 10µVP-P (0.1Hz–10Hz); minimizes quantization uncertainty in high-resolution digitization of slow-varying signals. |
| TEMP Pin Output | 630mV at +25°C with 2.1mV/°C slope; provides ratiometric, self-calibrating temperature sensing without external components. |
| Supply Range | 7V to 33V DC; supports operation from unregulated 9V/12V rails and battery-backed supplies in portable instrumentation. |
| Quiescent Current | 1.0–1.4mA; enables continuous operation in power-constrained embedded systems with <15mW dissipation in SO-8 package. |
Pinout & Package
REF02CSA+ is housed in an 8-pin Small Outline (SO) package (S8-2), measuring 4.9mm × 6.0mm × 1.75mm, with standard JEDEC MS-012AC footprint and lead-free (RoHS-compliant) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOUT) | Main reference output | Stable 5V source; capable of sourcing up to 10mA and sinking 0.3mA while maintaining specified accuracy. |
| 2 (TRIM) | Voltage adjustment node | Connects to external 10kΩ potentiometer; adjusts VOUT by ±300mV (±6%) with negligible tempco impact. |
| 3 (TEMP) | Temperature transducer output | Outputs 630mV at 25°C, varying linearly at 2.1mV/°C; requires ≤50nA load and ≤30pF capacitance for accuracy. |
| 4 (GND) | Analog ground reference | Common return for VOUT, TRIM, TEMP, and VIN; must be low-impedance to avoid ground bounce errors. |
| 5 (VIN) | Positive supply input | Accepts 7V–33V DC; internal current limiting protects against overvoltage and reverse polarity during board insertion. |
| 6 (NC) | No connection | Internally unconnected; must remain floating - no routing or stitching to ground/power. |
| 7 (NC) | No connection | Internally unconnected; PCB pad may be omitted or left unconnected per layout best practices. |
| 8 (NC) | No connection | Internally unconnected; serves as mechanical support only; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Pretrimmed 5V output | Factory-set to 5.000V ±15mV (REF02E/H grade) or ±25mV (REF02H); REF02CSA+ uses ±50mV spec but retains same core architecture. |
| Integrated temperature sensor | Monolithic TEMP pin output eliminates need for discrete thermistor or RTD interface circuitry - reduces BOM count and calibration complexity. |
| Low-noise reference core | 10µVP-P (0.1Hz–10Hz) noise floor enables sub-LSB stability in 16-bit+ data acquisition systems without external filtering. |
| Short-circuit protected output | Withstands indefinite short to GND or VIN without latch-up or parametric shift - simplifies fault-tolerant design in field-deployed equipment. |
| Adjustable output with minimal tempco penalty | TRIM pin enables system-level calibration; each 100mV output shift adds only 0.7ppm/°C to tempco - preserves thermal performance during tuning. |
Applications
| High-Accuracy Digital Voltmeters | Precision Temperature Monitoring Systems |
|---|---|
Use Scenario: Benchtop and handheld DVMs requiring stable 5V reference for ADC excitation and ratio-metric measurement. IC Role / Device Role / Timing Role: Primary voltage reference and excitation source for dual-slope or sigma-delta ADCs; TEMP pin unused. Use Value: ±50mV initial error and 65ppm/°C tempco ensure <0.05% full-scale accuracy over 0°C–70°C without recalibration. | Use Scenario: Industrial environmental sensors with remote temperature readout via analog voltage transmission. IC Role / Device Role / Timing Role: Dual-role device: 5V reference powers signal conditioning circuitry; TEMP pin provides calibrated analog temperature output. Use Value: Eliminates separate temperature IC and reference IC - reduces component count, board area, and inter-channel gain mismatch. |
| Calibrated Data Acquisition Front-Ends | Programmable Logic Controller (PLC) Analog Input Modules |
Use Scenario: Modular DAQ systems where channel-to-channel matching and long-term drift are critical. IC Role / Device Role / Timing Role: Per-channel reference and local temperature monitor for offset/drift compensation algorithms. Use Value: Matched 5V references across channels plus on-chip temperature data enable real-time software correction of thermal drift in multiplexed inputs. | Use Scenario: DIN-rail mounted PLC I/O modules needing rugged, field-serviceable analog input stages. IC Role / Device Role / Timing Role: Reference for 12-/14-bit SAR ADCs and diagnostic temperature monitor for module health reporting. Use Value: Single-component solution meets IEC 61000-4 immunity requirements while providing built-in thermal derating alerts via TEMP voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF02HSA+ | Same SO-8 package, but tighter 25ppm/°C max tempco and ±25mV initial error; higher cost. | Better suited for extended-temperature or metrology-grade designs where 0°C–70°C drift budget is <1.75mV. | Select REF02HSA+ when system-level accuracy demands <0.035% reference drift over temperature - REF02CSA+ remains optimal for cost-sensitive industrial control. |
| MAX6035AESA+ | 5V shunt reference (not series), SOT23-3 package, 20ppm/°C tempco, ±0.2% initial accuracy, 65µA quiescent current. | Requires external bias resistor; unsuitable for TEMP functionality or >1mA load; lower power but no temperature output. | Choose MAX6035AESA+ only for ultra-low-power, space-constrained applications where temperature sensing is handled separately - REF02CSA+ is irreplaceable when dual 5V reference + TEMP output is required. |
Compared with REF02HSA+, REF02CSA+ trades 40ppm/°C higher tempco for lower unit cost and identical SO-8 footprint; versus MAX6035AESA+, it offers 15× higher load drive, integrated TEMP output, and series topology - making REF02CSA+ the sole option for combined precision reference and analog temperature transduction in one SO-8 IC.
Availability
REF02CSA+ is available at Aetrix Electronics and suitable for industrial control systems, test and measurement instruments, and programmable logic controller (PLC) analog input modules requiring stable component supply across multi-year production cycles.
Supply support for REF02CSA+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The REF02 product line was engineered specifically for applications demanding both precision voltage referencing and integrated temperature monitoring - targeting data acquisition, calibration standards, and sensor signal conditioning where space, cost, and functional integration are critical.
FAQ
What is the operating temperature range of the REF02CSA+?
The REF02CSA+ is rated for operation from 0°C to +70°C. This industrial-grade temperature range is validated per Maxim's datasheet specifications for the REF02C grade, and applies to all SO-8 packaged variants including REF02CSA+. The device is not characterized for operation below 0°C or above +70°C - use REF02CESA+ for -40°C to +85°C extended-range applications.
Can the REF02CSA+ be used as a standalone temperature sensor without using its 5V reference output?
Yes, the REF02CSA+ can operate with only the TEMP pin active, provided VIN is applied within 7V–33V and GND is connected. The TEMP pin delivers 630mV at +25°C with a precise 2.1mV/°C slope, independent of the 5V output state. However, the 5V reference must still be properly terminated (e.g., with ≥10kΩ load) to maintain internal bias stability - leaving VOUT open may cause TEMP output inaccuracy.
What is the maximum load current the REF02CSA+ can drive on its VOUT pin?
The REF02CSA+ can source up to 10mA while maintaining output voltage accuracy within specification (±0.01%/mA load regulation). At 25°C and VIN = 15V, it guarantees operation up to 10mA; under worst-case conditions (70°C, min VIN), the practical limit is ~8mA. Exceeding this may cause output droop or increased tempco - always verify with actual load and thermal conditions in final design.
How does the TRIM pin on the REF02CSA+ affect the TEMP pin output?
The TRIM pin adjusts only the main 5V reference output (VOUT); it has no effect on the TEMP pin voltage or its temperature coefficient. The TEMP output remains fixed at 630mV ±10mV at +25°C with 2.1mV/°C slope regardless of VOUT adjustment. This isolation is confirmed in Maxim's REF02 datasheet Section "Output Adjustment" and Figure 5 (Precision Temperature Transducer).
Is the REF02CSA+ pin-compatible with other REF02 variants in SO-8 packages?
Yes, the REF02CSA+ shares identical pinout, footprint, and electrical interface with all SO-8 REF02 variants (e.g., REF02HSA+, REF02CESA+). All use the S8-2 package with VOUT–TRIM–TEMP–GND–VIN–NC–NC–NC pin assignment. This allows direct substitution within the same temperature grade family - though performance specs (tempco, initial error) differ, PCB layout requires no changes.
REF02CSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- REF02
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 21 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 65ppm/°C
- Noise - 0.1Hz to 10Hz:
- 12µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 8V ~ 30V
- Current - Supply:
- 1.6mA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF02CSA+ FAQ
1.How can I place an order for REF02CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02CSA+ 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 REF02CSA+ reliable?
The price and inventory of REF02CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02CSA+ is usually 5 days.
3.What payment methods are accepted for REF02CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02CSA+?
REF02CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02CSA+ 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 REF02CSA+?
For technical support, including REF02CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02CSA+ requirements.
6.How does Aetrix verify that REF02CSA+ is sourced from the original manufacturer or authorized distributors?
All REF02CSA+ 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 REF02CSA+ meets industry standards.
7.What is the process for return or replacement of REF02CSA+?
All REF02CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with REF02CSA+, 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 REF02CSA+ part is unused and in its original packaging.
Return procedure for REF02CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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