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Analog Devices Inc./Maxim Integrated ICL8069ACSQ
- Part No.:
- ICL8069ACSQ
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-206AC, TO-52-3 Metal Can
- Datasheet:
-
ICL8069ACSQ.pdf
- Description:
- ICL8069 LOW-VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
ICL8069ACSQ from Maxim Integrated is a 1.2V temperature-compensated bandgap voltage reference in TO-52 metal can package, specified for 0°C to +70°C operation with guaranteed 10ppm/°C max temperature coefficient, 1.20V–1.25V output voltage at 500µA reverse current, and 5µV RMS noise (10Hz–10kHz). It serves as a precision low-voltage reference in portable instrumentation and high-resolution ADC/DAC circuits.
For engineers reviewing the ICL8069ACSQ datasheet, ICL8069ACSQ pinout, ICL8069ACSQ application, or ICL8069ACSQ equivalent, key selection considerations include its TO-52 thermal performance, 50µA minimum bias current requirement, reverse-biased operation mode, and compatibility with low-power, low-noise analog signal chains requiring stable sub-1.25V references.
Technical Context
The ICL8069ACSQ operates as a two-terminal, reverse-biased bandgap reference, delivering a stable 1.2V output without external biasing circuitry beyond a series current-limiting resistor. Its architecture achieves low dynamic impedance and oscillation-free behavior even with up to 200pF of stray capacitance when paired with a 4.7µF shunt capacitor.
It is characterized across its full operating temperature range (0°C to +70°C) with output voltage change ≤20mV over 50µA–5mA reverse current and ≤15mV over temperature, supporting applications where supply headroom is constrained and thermal drift must remain below 10ppm/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.20V–1.25V at 500µA reverse current - defines usable reference level for 12-bit+ ADCs with <0.05% full-scale error |
| Tempco | ≤10ppm/°C max - ensures <±120µV drift over 0°C to +70°C, critical for battery-powered metering |
| Noise (10Hz–10kHz) | 5µV RMS - enables resolution below 16-bit ENOB in precision digitization paths |
| Reverse Current Range | 50µA–5mA - supports ultra-low-power operation while maintaining regulation stability |
| Dynamic Impedance | 1Ω typical - minimizes load-induced output perturbation in multiplexed reference distribution |
| Forward Voltage Drop | 0.6V–1.0V at 500µA - allows safe handling during hot-plug or test fixture insertion |
Pinout & Package
ICL8069ACSQ uses a hermetically sealed TO-52 metal can package with two leads: Anode (pin 1) and Cathode (pin 2), configured for reverse-bias operation. No internal connections to case or auxiliary terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias input terminal | Connected to system ground or lowest potential node; reverse current flows into this pin |
| Cathode | Reference output terminal | Delivers regulated 1.2V output; must be decoupled with ≥4.7µF capacitor if >200pF strays present |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 10ppm/°C tempco | Enables single-point calibration for industrial sensors operating across commercial temperature range |
| 5µV RMS noise (10Hz–10kHz) | Supports effective resolution >16 bits in sigma-delta ADC front-ends without additional filtering |
| 50µA minimum bias current | Permits use with high-value series resistors (>100kΩ) in battery-critical applications |
| Stable under 200pF strays | Eliminates need for layout guard rings in compact PCB designs with adjacent digital traces |
Applications
| Portable Digital Multimeters | High-Resolution Data Acquisition Systems |
|---|---|
Use Scenario: Battery-powered handheld DMMs requiring 4½-digit accuracy and 100-hour runtime. IC Role / Device Role / Timing Role: Primary 1.2V reference for ICL7107-based DPM core, setting full-scale voltage and ADC gain. Use Value: 10ppm/°C tempco and 5µV noise ensure <0.02% measurement repeatability across ambient temperature shifts. | Use Scenario: Modular DAQ modules for lab-grade signal conditioning with 24-bit sigma-delta converters. IC Role / Device Role / Timing Role: Low-noise, low-drift reference for ADC reference input and DAC output buffer biasing. Use Value: 1Ω dynamic impedance prevents code flicker during multiplexed channel switching and sensor excitation sequencing. |
| Low-Power Sensor Transmitters | Medical Instrumentation Front-Ends |
Use Scenario: 4–20mA loop-powered temperature transmitters with microamp-level quiescent current budget. IC Role / Device Role / Timing Role: Precision reference for RTD bridge excitation and ADC reference in ultra-low-power SAR converter. Use Value: 50µA min reverse current enables direct connection to LDO output without active biasing, reducing component count. | Use Scenario: Portable ECG and pulse oximeter devices requiring clinical-grade analog front-end stability. IC Role / Device Role / Timing Role: Reference source for programmable gain instrumentation amplifiers and anti-aliasing filter calibration. Use Value: Hermetic TO-52 package ensures long-term parameter stability and moisture resistance critical for medical certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF191GS | 1.25V output, SO-8 package, 20ppm/°C max tempco, 8µV noise | Requires PCB redesign due to different pinout and higher voltage; better suited for new designs with margin for 1.25V systems | Select REF191GS only when upgrading legacy designs and 1.25V reference level is acceptable |
| LM385BZ-1.2 | 1.235V nominal, TO-92 package, 100ppm/°C max tempco, no guaranteed low-noise spec | Higher drift limits use in precision metrology; same mechanical footprint but inferior thermal stability | Accept LM385BZ-1.2 only for cost-sensitive, non-critical applications where ±0.1% accuracy suffices |
Compared with REF191GS and LM385BZ-1.2, the ICL8069ACSQ offers superior temperature stability and lower noise in a proven TO-52 package, making it preferable for recalibration-critical legacy instruments-though REF191GS provides modern manufacturability and LM385BZ-1.2 offers lowest unit cost where drift is tolerable.
Availability
ICL8069ACSQ is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, and low-power sensor transmitter designs requiring stable component supply despite its Not Recommended for New Designs status.
Supply support for ICL8069ACSQ 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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The ICL8069ACSQ belongs to Maxim's precision voltage reference product line, designed specifically for low-voltage, low-power, high-stability applications in portable and battery-operated test equipment.
FAQ
What is the operating mode of the ICL8069ACSQ?
The ICL8069ACSQ operates in reverse-bias mode: current flows from cathode to anode, with the cathode delivering the 1.2V reference output. It is not forward-conducting like a Zener diode. This configuration enables low-noise, low-drift performance with minimal external components. The ICL8069ACSQ requires a series current-limiting resistor and may need a 4.7µF shunt capacitor if board strays exceed 200pF.
What temperature range is specified for the ICL8069ACSQ?
The ICL8069ACSQ is rated for operation from 0°C to +70°C, with electrical characteristics fully guaranteed across this commercial temperature range. Its 10ppm/°C max temperature coefficient is verified at three points (0°C, +25°C, +70°C), and output voltage change remains ≤15mV over this span at 500µA reverse current. The TO-52 package contributes to consistent thermal response.
Can the ICL8069ACSQ replace a standard 1.25V reference like the LM385?
No-the ICL8069ACSQ delivers 1.20V–1.25V depending on reverse current and unit grade, but its primary specification is 1.2V nominal with tighter tempco and lower noise than generic 1.25V references. Substituting it for an LM385BZ-1.25 would require recalibrating gain-setting resistors and verifying ADC full-scale alignment. The ICL8069ACSQ is optimized for 1.2V systems such as ICL7107-based DPMs.
Why is the ICL8069ACSQ marked "Not Recommended for New Designs"?
The ICL8069ACSQ is marked "Not Recommended for New Designs" because its wafer fabrication process was discontinued by Maxim's external foundry, and no second-source or drop-in replacement is officially supported. While existing stock remains functional and datasheet-supported, Maxim advises new projects to evaluate alternatives like REF191GS for long-term supply assurance and improved specs-though the ICL8069ACSQ remains valid for legacy repair and calibration continuity.
What is the maximum reverse voltage the ICL8069ACSQ can withstand?
The ICL8069ACSQ has an absolute maximum reverse voltage rating of 20V, though normal operation restricts reverse voltage to ≤1.25V (its output voltage). During hot-plug events or test fixture insertion, transient voltages up to 20V may occur briefly without damage. Sustained reverse voltage above 1.25V degrades regulation accuracy and increases noise; operation above 20V risks permanent damage per Absolute Maximum Ratings.
ICL8069ACSQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-206AC, TO-52-3 Metal Can
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±2.43%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 5µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 50 µA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-52
ICL8069ACSQ FAQ
1.How can I place an order for ICL8069ACSQ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL8069ACSQ 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 ICL8069ACSQ reliable?
The price and inventory of ICL8069ACSQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL8069ACSQ is usually 5 days.
3.What payment methods are accepted for ICL8069ACSQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL8069ACSQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL8069ACSQ?
ICL8069ACSQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL8069ACSQ 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 ICL8069ACSQ?
For technical support, including ICL8069ACSQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL8069ACSQ requirements.
6.How does Aetrix verify that ICL8069ACSQ is sourced from the original manufacturer or authorized distributors?
All ICL8069ACSQ 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 ICL8069ACSQ meets industry standards.
7.What is the process for return or replacement of ICL8069ACSQ?
All ICL8069ACSQ units undergo pre-shipment inspection (PSI). If there is an issue with ICL8069ACSQ, 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 ICL8069ACSQ part is unused and in its original packaging.
Return procedure for ICL8069ACSQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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