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Analog Devices Inc./Maxim Integrated LM4051CIX3-1.2+
- Part No.:
- LM4051CIX3-1.2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4051CIX3-1.2+.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,281
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Product details
Overview
LM4051CIX3-1.2+ from Maxim Integrated is a precision 1.225V shunt voltage reference in SC70-3 package, featuring ±0.5% initial accuracy, 50ppm/°C max temperature coefficient, and 60µA to 15mA operating current range. It delivers stable reverse breakdown voltage for ADC/DAC biasing, portable power monitoring, and battery management systems where space and low quiescent current are critical.
For engineers reviewing the LM4051CIX3-1.2+ datasheet, LM4051CIX3-1.2+ pinout, LM4051CIX3-1.2+ application, or LM4051CIX3-1.2+ equivalent, this page provides verified specifications, SC70-3 terminal mapping, real-world use cases in battery-powered instrumentation, and validated alternative parts with documented performance trade-offs.
Technical Context
The LM4051CIX3-1.2+ uses a laser-trimmed bandgap core to maintain 1.225V reverse breakdown across -40°C to +125°C. Its two-terminal shunt architecture sinks current via an internal pass transistor, requiring no external capacitor for stability while tolerating any capacitive load.
It operates as a precision voltage clamp with forward conduction at ~0.7V (anode-to-cathode), enabling dual-mode functionality. Dynamic impedance is ≤1.5Ω at 1mA, ensuring <8mV output shift over 1mA–12mA current variation and 20µVRMS wideband noise (10Hz–10kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal reverse breakdown voltage - sets precise reference level for analog signal chains and data converters. |
| Initial Accuracy | ±0.5% (LM4051C grade) - ensures ≤±6.1mV absolute error at +25°C without calibration. |
| Temp Coefficient | 50ppm/°C max - guarantees ≤±6.1mV drift over full -40°C to +125°C range. |
| Operating Current | 60µA to 15mA - supports ultra-low-power sensor nodes and high-current reference buffering. |
| Dynamic Impedance | ≤1.5Ω at 1mA - minimizes output voltage shift under dynamic load transients. |
| Wideband Noise | 20µVRMS (10Hz–10kHz) - enables high-resolution 16-bit+ ADC applications without added filtering. |
| Long-Term Stability | 120ppm over 1000h - ensures reference integrity in deployed industrial equipment. |
Pinout & Package
LM4051CIX3-1.2+ uses the SC70-3 (SOT-883) package: 1.8mm × 1.8mm, 0.5mm pitch, 0.9mm max height. Pin 3 is NC and must be left floating or tied to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode / Cathode Input | Positive terminal of shunt reference - connects to supply rail through series resistor (RS) to establish reverse bias current. |
| Pin 2 (−) | Cathode / Reference Output | Negative terminal - provides stable 1.225V reference node; serves as ground-referenced output for downstream circuitry. |
| Pin 3 (N.C.) | No Connection | Unused terminal - must remain unconnected or shorted to Pin 2 per datasheet; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - saves >50% board space vs. SOT23-3, ideal for wearables and compact IoT sensors. |
| No output capacitor required | Fully stable with zero or any capacitive load - eliminates BOM cost and layout constraints for decoupling. |
| Low micropower operation | 60µA minimum shunt current - enables operation from coin cells or energy-harvesting sources. |
| High-temperature rated | Guaranteed performance from -40°C to +125°C - suitable for automotive cabin modules and industrial motor controls. |
| Laser-trimmed accuracy | 0.5% initial tolerance achieved via on-die trimming - reduces need for system-level calibration. |
Applications
| Portable Medical Sensors | Battery Fuel Gauging |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) using low-power ADC to digitize electrochemical sensor output. IC Role / Device Role / Timing Role: Provides stable 1.225V reference for 14-bit SAR ADC, rejecting supply ripple and thermal drift. Use Value: Enables ±0.5% measurement accuracy over -20°C to +50°C ambient, meeting ISO 15197 clinical requirements. | Use Scenario: Smart battery pack with integrated fuel gauge IC monitoring Li-ion cell voltage during charge/discharge cycles. IC Role / Device Role / Timing Role: Supplies precision reference to coulomb counter's analog front-end, compensating for voltage sag under load. Use Value: Reduces state-of-charge (SoC) estimation error to <2% across 0–100% capacity and 0°C–45°C temperature range. |
| Industrial Process Transmitters | Wireless Sensor Node Power Management |
Use Scenario: 4–20mA loop-powered pressure transmitter operating in factory environments up to +85°C. IC Role / Device Role / Timing Role: Sets reference for DAC generating loop current; maintains accuracy despite 24V supply variation and self-heating. Use Value: Ensures <0.1% full-scale error over 15-year field life, meeting IEC 61298-2 Class 0.1 specification. | Use Scenario: Sub-GHz wireless node powered by solar harvester, duty-cycled to extend battery life beyond 10 years. IC Role / Device Role / Timing Role: Supplies reference to ultra-low-power ADC sampling temperature/humidity, active only during wake-up bursts. Use Value: Draws just 60µA quiescent current, extending coin-cell lifetime to >7 years at 1-sampling-per-minute duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 2.5V fixed output; adjustable version available; 2% initial accuracy; 100ppm/°C tempco; SOT23-3 package. | Higher output voltage limits use in 1.2V–1.8V logic domains; wider tolerance requires calibration in precision systems. | Select when cost sensitivity outweighs accuracy needs and 2.5V reference suffices for system architecture. |
| ADR3412ARJZ-R7 | 1.2V output; ±0.1% initial accuracy; 30ppm/°C tempco; 12µA typical quiescent current; SOT23-5 package. | Lower noise (12µVRMS) and tighter spec support higher-resolution metrology; 5-pin package adds enable control but increases footprint. | Choose for test equipment or medical diagnostics where long-term stability and sub-10ppm drift are mandatory. |
Compared with TLVH431ACDBVR and ADR3412ARJZ-R7, the LM4051CIX3-1.2+ offers optimal balance of 1.225V output matching common LDO feedback networks, SC70-3 space efficiency, and guaranteed 50ppm/°C performance across automotive temperature range - making it preferred for compact, battery-constrained industrial sensors.
Availability
LM4051CIX3-1.2+ is available at Aetrix Electronics and suitable for portable medical sensors, battery fuel gauging, and industrial process transmitters requiring stable component supply with RoHS-compliant, lead-free packaging.
Supply support for LM4051CIX3-1.2+ 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The LM4050/LM4051 family delivers micropower shunt references optimized for space-constrained, wide-temperature systems where stability, low drift, and minimal external components are essential.
FAQ
What is the exact output voltage tolerance of LM4051CIX3-1.2+ at +25°C?
The LM4051CIX3-1.2+ has a nominal output voltage of 1.225V with ±0.5% initial accuracy at +25°C, corresponding to a tolerance range of 1.2189V to 1.2311V per the LM4051C grade specification. This value is laser-trimmed and guaranteed by production test, not derived from temperature coefficient extrapolation.
Can LM4051CIX3-1.2+ operate without an external capacitor?
Yes, LM4051CIX3-1.2+ does not require an external output capacitor and remains stable with zero or any capacitive load. This is confirmed in the datasheet's "Output Capacitance" section and validated across all operating conditions, eliminating risk of oscillation in high-impedance sensor interfaces.
What is the minimum shunt current needed for regulation in LM4051CIX3-1.2+?
The LM4051CIX3-1.2+ requires a minimum shunt current of 60µA to maintain regulation, as specified in its Electrical Characteristics table. Below this threshold, output voltage deviates from 1.225V; design must ensure RS selection keeps ISHUNT ≥60µA across worst-case supply and load conditions.
Is LM4051CIX3-1.2+ compatible with lead-free reflow processes?
Yes, LM4051CIX3-1.2+ carries the "+" suffix indicating RoHS-compliant, lead-free construction. It supports standard Pb-free reflow profiles per JEDEC J-STD-020, with peak temperature up to +260°C and maximum lead temperature of +300°C for 10 seconds, matching SC70 package thermal limits.
How does LM4051CIX3-1.2+ behave under forward bias?
When forward biased (anode positive relative to cathode), LM4051CIX3-1.2+ clamps at approximately one diode drop (~0.7V) - a behavior explicitly documented in the "Detailed Description" section. This allows dual-mode use as both shunt reference and low-voltage clamp in protection circuits.
LM4051CIX3-1.2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 60 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4051CIX3-1.2+ FAQ
1.How can I place an order for LM4051CIX3-1.2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CIX3-1.2+ 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 LM4051CIX3-1.2+ reliable?
The price and inventory of LM4051CIX3-1.2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051CIX3-1.2+ is usually 5 days.
3.What payment methods are accepted for LM4051CIX3-1.2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CIX3-1.2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CIX3-1.2+?
LM4051CIX3-1.2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CIX3-1.2+ 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 LM4051CIX3-1.2+?
For technical support, including LM4051CIX3-1.2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CIX3-1.2+ requirements.
6.How does Aetrix verify that LM4051CIX3-1.2+ is sourced from the original manufacturer or authorized distributors?
All LM4051CIX3-1.2+ 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 LM4051CIX3-1.2+ meets industry standards.
7.What is the process for return or replacement of LM4051CIX3-1.2+?
All LM4051CIX3-1.2+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CIX3-1.2+, 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 LM4051CIX3-1.2+ part is unused and in its original packaging.
Return procedure for LM4051CIX3-1.2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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