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Analog Devices Inc./Maxim Integrated LM4051CIM3-1.2+T
- Part No.:
- LM4051CIM3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CIM3-1.2+T.pdf
- Description:
- LM4051 50PPM PER DEGREE CELSIUS
- Quantity:
- Payment:
- Shipping:
Inventory:65,000
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Product details
Overview
LM4051CIM3-1.2+T 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+T datasheet, LM4051CIM3-1.2+T pinout, LM4051CIM3-1.2+T application, or LM4051CIM3-1.2+T equivalent, key selection criteria include guaranteed -40°C to +125°C operation, no external capacitor requirement, ultra-low 28µVRMS noise (10Hz–10kHz), and compatibility with capacitive loads in high-density PCB layouts.
Technical Context
The LM4051CIM3-1.2+T uses bandgap-based shunt architecture to maintain a precise 1.225V reverse breakdown voltage across its anode and cathode terminals. Its internal laser-trimmed resistors and BiCMOS process ensure stable regulation without external stabilization components.
It operates as a two-terminal device with pin 3 (N.C.) floating or tied to pin 2, enabling simple integration into voltage divider or current-sink configurations. The SC70-3 package supports thermal performance up to +125°C ambient while maintaining ≤120ppm long-term stability over 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal reverse breakdown voltage, tightly regulated across 60µA–15mA shunt current |
| Initial Accuracy | ±0.5% at +25°C - ensures reference error ≤±6.1mV before temperature drift compensation |
| Temp Coefficient | 50ppm/°C max - contributes ≤±6.25mV drift over full -40°C to +125°C range |
| Operating Current | 60µA min / 15mA max - enables micropower operation in battery-powered systems |
| Output Noise | 28µVRMS (10Hz–10kHz) - minimizes quantization error in 16-bit+ data converters |
| Long-Term Stability | 120ppm over 1000h - supports calibration integrity in industrial sensor front-ends |
| Dynamic Impedance | 1.5Ω max at 1mA - maintains voltage regulation under fast load transients |
Pinout & Package
The LM4051CIM3-1.2+T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 1 is the anode (+), pin 2 is the cathode (−), and pin 3 is no-connect (N.C.), which must be left floating or connected to pin 2 per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode terminal | Connects to system ground or low-side reference node; sinks current when reverse-biased |
| 2 (−) | Cathode terminal | Connects to regulated voltage node; defines 1.225V potential relative to pin 1 |
| 3 (N.C.) | No connection | Must remain unconnected or tied to pin 2 - not used for signal or thermal enhancement |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% board space vs. SOT23, critical for wearables and compact IoT nodes |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout constraints of external stabilization caps |
| Wide shunt current range | 60µA–15mA operation supports both ultra-low-power sleep modes and active high-accuracy measurement phases |
| Low wideband noise | 28µVRMS (10Hz–10kHz) enables high-resolution analog signal chains without added filtering overhead |
| Guaranteed automotive-grade temp range | -40°C to +125°C operation validated for industrial control, automotive body electronics, and harsh-environment sensors |
Applications
| Portable Battery Monitoring | High-Resolution Data Acquisition |
|---|---|
Use Scenario: Real-time cell voltage sensing in lithium-ion battery packs for smart chargers and power tools. IC Role / Device Role / Timing Role: Provides stable 1.225V reference for ADC input scaling and coulomb counting circuitry. Use Value: Enables ±0.5% voltage measurement accuracy across temperature, extending battery life estimation fidelity by >20% vs. uncalibrated references. | Use Scenario: Precision analog front-end in portable medical devices such as ECG monitors and glucose meters. IC Role / Device Role / Timing Role: Supplies low-noise reference to 16-bit SAR ADCs sampling biopotential signals. Use Value: 28µVRMS noise floor preserves signal-to-noise ratio, supporting ≥90dB ENOB without post-processing correction. |
| Industrial Process Sensor Calibration | Automotive Body Control Modules |
Use Scenario: Factory calibration of pressure and temperature transmitters during production test. IC Role / Device Role / Timing Role: Serves as traceable voltage standard for automated test equipment (ATE) referencing. Use Value: 120ppm long-term stability ensures calibration validity over 12 months, reducing retest frequency and NIST traceability costs. | Use Scenario: Reference source for window comparator circuits detecting door latch position or seatbelt status. IC Role / Device Role / Timing Role: Delivers robust 1.225V threshold for hysteresis comparators operating in vehicle cabin environments. Use Value: Guaranteed -40°C to +125°C operation prevents false triggers due to thermal drift, meeting ISO 16750-4 requirements. |
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), 60ppm/°C tempco, 80µA min operating current | Requires external resistor network for 1.225V setting; less accurate at target voltage | Choose when adjustable output or higher voltage headroom is needed; verify resistor tolerance impact on accuracy |
| ADR3412ARJZ-R7 | Fixed 1.200V output, 10ppm/°C max tempco, 100µA min current, 10µVRMS noise | Lower noise and tighter tempco but higher minimum current limits micropower use cases | Prefer for ultra-low-drift applications where 25mV offset vs. 1.225V is acceptable and supply can support >100µA quiescent load |
Compared with TLVH431ACDBVR and ADR3412ARJZ-R7, the LM4051CIM3-1.2+T uniquely combines exact 1.225V output, ultra-low 60µA startup current, and SC70 packaging-making it optimal for space-constrained, battery-operated systems requiring factory-trimmed accuracy without external components.
Availability
LM4051CIM3-1.2+T is available at Aetrix Electronics and suitable for portable battery monitoring, high-resolution data acquisition, industrial process sensor calibration, and automotive body control modules requiring stable component supply across extended temperature ranges.
Supply support for LM4051CIM3-1.2+T 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 industrial, automotive, and communications markets, emphasizing high accuracy, low power, and small form factors.
The LM4050/LM4051 product line delivers micropower shunt voltage references optimized for space-critical, battery-operated systems needing stable, capacitor-free voltage references across -40°C to +125°C.
FAQ
What is the exact output voltage tolerance of the LM4051CIM3-1.2+T at +25°C?
The LM4051CIM3-1.2+T 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 during production and does not require user calibration.
Can the LM4051CIM3-1.2+T operate without an external output capacitor?
Yes, the LM4051CIM3-1.2+T is internally compensated and remains stable with any capacitive load - including zero capacitance. No external output capacitor is required, simplifying design and reducing BOM count. This behavior is verified across the full 60µA–15mA operating current range.
What is the minimum operating current required for regulation in the LM4051CIM3-1.2+T?
The LM4051CIM3-1.2+T requires a minimum shunt current of 60µA to maintain regulation at 1.225V. Below this threshold, output voltage deviates significantly; the datasheet specifies 45µA as absolute minimum but guarantees regulation only above 60µA across the full temperature range.
How does pin 3 function on the LM4051CIM3-1.2+T, and what happens if it's left unconnected?
Pin 3 of the LM4051CIM3-1.2+T is designated N.C. (no connection) and must either be left floating or connected to pin 2 (cathode). Leaving it unconnected is fully compliant and introduces no functional risk - the device operates identically in both configurations per Maxim's official pin description and typical operating circuit diagrams.
Is the LM4051CIM3-1.2+T RoHS-compliant and lead-free?
Yes, the "+T" suffix in LM4051CIM3-1.2+T indicates RoHS-compliant, lead-free construction per Maxim's part numbering convention. The device meets JEDEC J-STD-609 Category 1 marking requirements and is qualified for lead-free reflow soldering profiles up to 260°C peak temperature.
LM4051CIM3-1.2+T 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+T FAQ
1.How can I place an order for LM4051CIM3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CIM3-1.2+T 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+T reliable?
The price and inventory of LM4051CIM3-1.2+T 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+T is usually 5 days.
3.What payment methods are accepted for LM4051CIM3-1.2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CIM3-1.2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CIM3-1.2+T?
LM4051CIM3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CIM3-1.2+T 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+T?
For technical support, including LM4051CIM3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CIM3-1.2+T requirements.
6.How does Aetrix verify that LM4051CIM3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4051CIM3-1.2+T 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+T meets industry standards.
7.What is the process for return or replacement of LM4051CIM3-1.2+T?
All LM4051CIM3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CIM3-1.2+T, 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+T part is unused and in its original packaging.
Return procedure for LM4051CIM3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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