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Analog Devices Inc./Maxim Integrated LM4051CIM3-1.2+
- Part No.:
- LM4051CIM3-1.2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CIM3-1.2+.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,334
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Product details
Overview
LM4051CIM3-1.2+ 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 LM4051CIM3-1.2+ datasheet, LM4051CIM3-1.2+ pinout, LM4051CIM3-1.2+ application, or LM4051CIM3-1.2+ equivalent, key selection criteria include guaranteed -40°C to +125°C operation, no external capacitor requirement, 28µVRMS wideband noise (10Hz–10kHz), and compatibility with capacitive loads in high-density PCB layouts.
Technical Context
The LM4051CIM3-1.2+ uses bandgap-based shunt regulation to maintain a precise 1.225V reverse breakdown voltage across its anode and cathode terminals. Its internal laser-trimmed resistor network ensures ±0.5% initial accuracy at +25°C, while BiCMOS process technology enables stable performance over ±15ppm/°C typical tempco within the full industrial temperature range.
It operates as a two-terminal device requiring only a series current-setting resistor (RS) and tolerates any output capacitance without oscillation. The N.C. pin (Pin 3) must be left floating or tied to Pin 2, confirming its role as a true 2-terminal reference with mechanical third-pin placeholder for SC70-3 packaging compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal reverse breakdown voltage - sets precise bias point for analog signal chains and data converters. |
| Initial Accuracy | ±0.5% at +25°C - supports 12-bit system-level accuracy without calibration in cost-sensitive designs. |
| Tempco | 50ppm/°C max over -40°C to +125°C - limits voltage drift to ±6.125mV across full temperature range. |
| Operating Current | 60µA to 15mA - enables micropower operation in battery-powered devices and robust regulation under varying load conditions. |
| Output Noise | 28µVRMS (10Hz–10kHz) - minimizes added noise in precision measurement front-ends and sensor interfaces. |
| Dynamic Impedance | 0.5Ω to 1.5Ω at 1mA - ensures minimal voltage shift under transient load changes in closed-loop feedback circuits. |
| Long-Term Stability | 120ppm after 1000 hours - guarantees predictable aging behavior for industrial equipment with >10-year service life. |
Pinout & Package
LM4051CIM3-1.2+ is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23-3. Pin 3 is unconnected (N.C.) and must be left floating or tied to Pin 2 per datasheet directive.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode | Positive terminal of shunt reference - connects to system ground or low-impedance return path in reverse-biased configuration. |
| Pin 2 (−) | Cathode | Negative terminal - connects to regulated voltage node via series resistor; carries full shunt current (ISHUNT). |
| Pin 3 (N.C.) | No Connection | Mechanical placeholder only - must remain unconnected or shorted to Pin 2; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - enables placement in space-constrained portable electronics and wearables. |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout area for stabilization caps in sensor nodes and IoT endpoints. |
| Wide shunt current range | 60µA minimum ensures reliable start-up in ultra-low-power modes; 15mA max supports high-accuracy reference buffering. |
| Guaranteed industrial temperature range | -40°C to +125°C operation - qualified for automotive cabin modules, industrial PLC I/O, and outdoor metering applications. |
| Low wideband noise | 28µVRMS (10Hz–10kHz) - preserves SNR in 16-bit SAR ADC references and precision instrumentation amplifiers. |
Applications
| Portable Battery Monitoring | Industrial Data Acquisition |
|---|---|
Use Scenario: Real-time cell voltage tracking in lithium-ion battery packs for handheld medical devices. IC Role / Device Role / Timing Role: Provides stable 1.225V reference for 12-bit ADC measuring individual cell voltages. Use Value: Enables ±0.5% voltage measurement accuracy across -20°C to +60°C ambient, supporting safe charge/discharge control. | Use Scenario: High-channel-count analog input module in factory-floor PLCs. IC Role / Device Role / Timing Role: Supplies precision reference to multiple simultaneous-sampling ADCs sharing common VREF. Use Value: Maintains <±1 LSB error across 16 channels despite thermal gradients and supply ripple up to 100mVpp. |
| Wearable Sensor Signal Chain | Automotive Cabin Temperature Sensing |
Use Scenario: Biasing low-noise op-amps and ADCs in optical heart-rate monitors. IC Role / Device Role / Timing Role: Delivers clean 1.225V reference to transimpedance amplifier and successive-approximation ADC stages. Use Value: 28µVRMS noise floor prevents degradation of photodiode signal integrity in sub-1µA current measurements. | Use Scenario: Reference for thermistor-based cabin temperature sensing in HVAC control units. IC Role / Device Role / Timing Role: Sets accurate scaling factor for ratiometric ADC conversion of thermistor divider output. Use Value: 50ppm/°C tempco ensures <±0.3°C absolute temperature error over -40°C to +85°C vehicle operating range. |
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 | Adjustable 1.24V reference (2.5V max); 0.5% initial accuracy; 100ppm/°C tempco; SOT23-3 package. | Requires external resistors for 1.225V setting; higher tempco reduces accuracy at temperature extremes. | Select when adjustable output or higher current drive (>15mA) is needed; verify stability with target capacitive load. |
| ADR3412ARJZ-R7 | Fixed 1.200V output; 0.1% initial accuracy; 30ppm/°C tempco; SC70-5 package with enable pin. | Lower output voltage (1.200V vs. 1.225V); 5-pin package adds complexity and board area. | Choose for tighter accuracy and lower tempco where 25mV offset is acceptable and enable functionality is beneficial. |
Compared with TLVH431ACDBVR and ADR3412ARJZ-R7, LM4051CIM3-1.2+ offers exact 1.225V output in the smallest footprint, optimal tempco for wide-temperature industrial use, and zero external components - making it ideal for fixed-voltage, space-constrained, and low-noise applications.
Availability
LM4051CIM3-1.2+ is available at Aetrix Electronics and suitable for portable medical devices, industrial data loggers, and automotive cabin sensors requiring stable component supply with RoHS-compliant, lead-free packaging.
Supply support for LM4051CIM3-1.2+ 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 was engineered to deliver high-accuracy, low-power shunt references in ultra-compact packages for battery-operated and thermally challenging systems.
FAQ
What is the output voltage tolerance of LM4051CIM3-1.2+ over its full operating temperature range?
The LM4051CIM3-1.2+ has ±0.5% initial accuracy at +25°C and a maximum temperature coefficient of 50ppm/°C. Over -40°C to +125°C, total output voltage tolerance is ±1.0%, calculated as ±0.5% ± (50ppm/°C × 100°C). This yields a guaranteed 1.225V output between 1.2126V and 1.2374V across temperature.
Can LM4051CIM3-1.2+ operate without an external capacitor?
Yes, LM4051CIM3-1.2+ does not require an external output capacitor for stability and remains stable with any capacitive load. This eliminates BOM cost and layout constraints, making LM4051CIM3-1.2+ ideal for compact, low-component-count designs such as wearable sensors and portable instrumentation.
What is the minimum operating current for LM4051CIM3-1.2+?
The minimum operating current for LM4051CIM3-1.2+ is 60µA, verified across -40°C to +125°C. Below this threshold, regulation is not guaranteed. Designers must ensure the series current-setting resistor (RS) maintains ≥60µA shunt current under worst-case conditions (minimum VS, maximum ILOAD).
How is Pin 3 used on LM4051CIM3-1.2+?
Pin 3 of LM4051CIM3-1.2+ is designated N.C. (No Connection) and serves only as a mechanical placeholder in the SC70-3 package. Per the datasheet, it must be left floating or connected to Pin 2 (cathode); it has no electrical function and must never be driven or loaded.
Is LM4051CIM3-1.2+ RoHS-compliant and lead-free?
Yes, LM4051CIM3-1.2+ is RoHS-compliant and lead-free, as indicated by the "+" suffix in the part number. It meets JEDEC J-STD-609 Category 1 moisture sensitivity level (MSL-1) and is qualified for reflow soldering per IPC/JEDEC J-STD-020.
LM4051CIM3-1.2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 12 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051CIM3-1.2+ FAQ
1.How can I place an order for LM4051CIM3-1.2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CIM3-1.2+ 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 LM4051CIM3-1.2+ reliable?
The price and inventory of LM4051CIM3-1.2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051CIM3-1.2+ is usually 5 days.
3.What payment methods are accepted for LM4051CIM3-1.2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CIM3-1.2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CIM3-1.2+?
LM4051CIM3-1.2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CIM3-1.2+ 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 LM4051CIM3-1.2+?
For technical support, including LM4051CIM3-1.2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CIM3-1.2+ requirements.
6.How does Aetrix verify that LM4051CIM3-1.2+ is sourced from the original manufacturer or authorized distributors?
All LM4051CIM3-1.2+ 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 LM4051CIM3-1.2+ meets industry standards.
7.What is the process for return or replacement of LM4051CIM3-1.2+?
All LM4051CIM3-1.2+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CIM3-1.2+, 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 LM4051CIM3-1.2+ part is unused and in its original packaging.
Return procedure for LM4051CIM3-1.2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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