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Analog Devices Inc./Maxim Integrated MAX6279ELA12+
- Part No.:
- MAX6279ELA12+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-CLCC
- Datasheet:
-
MAX6279ELA12+.pdf
- Description:
- IC VREF SHUNT 0.1% 8LCC
- Quantity:
- Payment:
- Shipping:
Inventory:410
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Product details
Overview
MAX6279ELA12+ from Maxim Integrated is a precision two-terminal shunt-mode bandgap voltage reference with a fixed reverse breakdown voltage of 1.225V, ±0.1% initial accuracy, 25ppm/°C max temperature coefficient over –40°C to +85°C, 70μA–12mA operating current range, and low 28μVRMS wideband noise (10Hz–10kHz). It delivers stable reference performance in space-constrained portable battery-powered systems.
For engineers reviewing the MAX6279ELA12+ datasheet, MAX6279ELA12+ pinout, MAX6279ELA12+ application, or MAX6279ELA12+ equivalent, key selection criteria include guaranteed long-term drift (30ppm at 1000h), hermetic ceramic LCC package stability, no-output-capacitor operation, and compatibility with capacitive loads up to 1µF without oscillation.
Technical Context
The MAX6279ELA12+ implements a laser-trimmed bandgap core with internal pass transistor to maintain precise 1.225V reverse breakdown across 70μA–12mA shunt current. Its dynamic impedance is 0.3Ω at 120Hz, enabling stable regulation under load transients and varying supply conditions.
Unlike standard zener references, it exhibits negligible sensitivity to output capacitance and requires no external stabilization capacitor. Its ceramic LCC package minimizes thermal hysteresis (typ. 60ppm) and humidity-induced mechanical stress, directly improving long-term voltage stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V ±0.001225V (0.1% initial accuracy at +25°C) |
| Temp Coefficient | ≤25ppm/°C over –40°C to +85°C - ensures ≤±2.05mV total drift across full industrial range |
| Operating Current | 70μA to 12mA - supports ultra-low-power sensing and high-current DAC reference simultaneously |
| Dynamic Impedance | 0.3Ω at 120Hz - maintains voltage stability during fast load transients (e.g., SAR ADC sampling) |
| Noise (10Hz–10kHz) | 28μVRMS - enables high-resolution (≥18-bit) analog measurement without added filtering |
| Long-Term Drift | 30ppm at 1000h - guarantees <0.037mV output shift after 42 days of continuous operation |
| Package | 8-pin ceramic LCC (3mm × 3mm) - hermetically sealed for stable performance in humid environments |
Pinout & Package
MAX6279ELA12+ uses an 8-pin ceramic LCC (leadless chip carrier) package with hermetic sealing for enhanced long-term stability and humidity resistance. Pin 6 is VREF (positive terminal), pins 4 and 8 are GND (negative terminal), pin 2 is I.C. (no connection, may be grounded), and pins 1, 3, 5, 7 are N.C. (not connected internally).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 6 | VREF | Positive terminal of shunt reference - connects to regulated node requiring stable 1.225V |
| 4, 8 | GND | Negative terminal - must be low-impedance ground return path for shunt current |
| 2 | I.C. | No-connect pin - electrically isolated; grounding improves EMI immunity but not required |
| 1, 3, 5, 7 | N.C. | Internally unconnected - must remain floating or tied to GND per layout best practices |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic ceramic LCC package | Eliminates humidity-induced voltage drift and reduces thermal hysteresis to 60ppm typical |
| No external capacitor required | Stable operation with any output capacitance (0–1µF), simplifying layout and reducing BOM count |
| Laser-trimmed bandgap core | Guarantees 0.1% initial accuracy without post-assembly calibration |
| Low dynamic impedance | 0.3Ω at 120Hz enables robust regulation under pulsed load currents (e.g., successive-approximation ADCs) |
| Wide shunt current range | 70μA–12mA operation supports both ultra-low-power sensor nodes and high-speed data converters |
Applications
| Portable Medical Sensors | Notebook Computer Power Monitoring |
|---|---|
|
Use Scenario: Reference for 24-bit delta-sigma ADC measuring ECG signal amplitude in battery-powered wearable monitors. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing stable 1.225V reference for analog front-end gain calibration and ADC conversion. Use Value: 28μVRMS noise and 30ppm long-term drift ensure sub-μV baseline stability over 7-day wear period without recalibration. |
Use Scenario: Precision reference for system power rail monitoring ICs (e.g., PMBus voltage supervisors) in ultrabook mainboards. IC Role / Device Role / Timing Role: Shunt reference sourcing current from 3.3V or 5V rails to generate accurate 1.225V for comparator thresholds. Use Value: 25ppm/°C TC and ceramic package stability maintain ±1.5mV accuracy across –10°C to +70°C board temperature swings. |
| Industrial Loop-Powered Transmitters | Cell Phone Battery Fuel Gauging |
|
Use Scenario: Reference for 4–20mA transmitter DACs operating from 24V loop supply with tight 0.1% full-scale error budget. IC Role / Device Role / Timing Role: Shunt reference sinking current through series resistor to establish stable bias point for current-output amplifier. Use Value: 70μA minimum operating current allows operation down to 3.5V loop voltage while maintaining 0.1% accuracy. |
Use Scenario: Reference for coulomb counter ICs measuring battery charge/discharge current in smartphones with 4.2V Li-ion cells. IC Role / Device Role / Timing Role: Low-noise shunt reference supplying stable 1.225V to current-sense amplifier input stage. Use Value: No-output-capacitor design avoids PCB area penalty in space-constrained mobile PCBs while ensuring 18-bit effective resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C12IDBZR | 1.225V, ±0.5% initial accuracy, 100ppm/°C TC, SOT-23 package, requires ≥60μA min current | Lower accuracy and higher TC limit use in high-stability industrial sensors or precision metrology | Select when cost sensitivity outweighs long-term drift and thermal hysteresis requirements |
| ADR3412ARJZ-R7 | 1.200V output, ±0.1% accuracy, 10ppm/°C TC, SOT-23, series topology (3-pin), requires 100μA–10mA supply current | Series architecture demands dedicated supply rail; incompatible with shunt-based high-voltage biasing | Choose only for low-noise, low-TC applications where three-terminal configuration and separate supply are acceptable |
Compared with LM4040C12IDBZR and ADR3412ARJZ-R7, the MAX6279ELA12+ uniquely combines 0.1% accuracy, 25ppm/°C TC, hermetic ceramic packaging, and true two-terminal shunt operation-enabling direct integration into high-voltage bias networks without additional regulators or layout constraints.
Availability
MAX6279ELA12+ is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power monitoring, and industrial loop-powered transmitters requiring stable component supply with guaranteed long-term drift performance and RoHS-compliant packaging.
Supply support for MAX6279ELA12+ 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6279ELA12+ belongs to Maxim's high-stability shunt voltage reference product line, engineered specifically for applications where long-term drift, thermal hysteresis, and environmental robustness outweigh cost-driven trade-offs.
FAQ
What is the maximum shunt current the MAX6279ELA12+ can safely handle?
The MAX6279ELA12+ has an absolute maximum reverse current rating of 20mA. While its specified operating range is 70μA to 12mA, exceeding 12mA risks violating the guaranteed 0.1% accuracy and 25ppm/°C temperature coefficient. Continuous operation above 12mA may also exceed power dissipation limits in the 8-pin ceramic LCC package, especially at elevated ambient temperatures.
Does the MAX6279ELA12+ require an external output capacitor for stability?
No, the MAX6279ELA12+ does not require an external output capacitor. Its internal design ensures unconditional stability with any output capacitance from 0 to at least 1µF, as verified in the datasheet's output impedance vs. frequency plots. This eliminates capacitor-related layout constraints and improves reliability in humid environments where electrolytic or tantalum capacitors may degrade.
How does the ceramic LCC package improve long-term stability of the MAX6279ELA12+?
The hermetically sealed ceramic LCC package prevents moisture ingress and mechanical stress transfer from the PCB, reducing long-term voltage drift to 30ppm at 1000 hours and thermal hysteresis to 60ppm. This outperforms plastic-packaged alternatives like the LM4040, which exhibit significantly higher humidity-induced drift and hysteresis due to polymer encapsulation swelling and contraction.
Can the MAX6279ELA12+ be used in forward-bias mode?
Yes, the MAX6279ELA12+ can conduct forward current up to 10mA (anode to cathode), behaving like a silicon diode. However, this mode is not intended for precision reference operation - forward conduction yields no regulated voltage and is only relevant for protection or dual-mode circuit designs where the device may experience reverse polarity transients.
What is the typical noise performance of the MAX6279ELA12+ and how does it impact high-resolution ADCs?
The MAX6279ELA12+ delivers 28μVRMS wideband noise (10Hz–10kHz), translating to ~4.5 LSB noise for a 24-bit, 2.5V-span ADC referenced to 1.225V. This enables effective resolution beyond 20 bits without external filtering, making it suitable for precision instrumentation and medical-grade data acquisition where quantization noise must remain below system noise floor.
MAX6279ELA12+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-CLCC
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 12 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LCC (3x3)
MAX6279ELA12+ FAQ
1.How can I place an order for MAX6279ELA12+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6279ELA12+ 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 MAX6279ELA12+ reliable?
The price and inventory of MAX6279ELA12+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6279ELA12+ is usually 5 days.
3.What payment methods are accepted for MAX6279ELA12+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6279ELA12+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6279ELA12+?
MAX6279ELA12+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6279ELA12+ 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 MAX6279ELA12+?
For technical support, including MAX6279ELA12+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6279ELA12+ requirements.
6.How does Aetrix verify that MAX6279ELA12+ is sourced from the original manufacturer or authorized distributors?
All MAX6279ELA12+ 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 MAX6279ELA12+ meets industry standards.
7.What is the process for return or replacement of MAX6279ELA12+?
All MAX6279ELA12+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6279ELA12+, 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 MAX6279ELA12+ part is unused and in its original packaging.
Return procedure for MAX6279ELA12+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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