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Analog Devices Inc./Maxim Integrated LM4051AIM3-1.2+T
- Part No.:
- LM4051AIM3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AIM3-1.2+T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:27,375
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Product details
Overview
LM4051AIM3-1.2+T from Maxim Integrated is a precision 1.225V shunt voltage reference in SC70-3 package, featuring ±0.1% initial accuracy, ±15ppm/°C temperature coefficient over –40°C to +125°C, 60µA–15mA operating current range, and 28µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference for ADCs, DACs, and battery-monitoring circuits in portable instrumentation.
For engineers reviewing the LM4051AIM3-1.2+T datasheet, LM4051AIM3-1.2+T pinout, LM4051AIM3-1.2+T application, or LM4051AIM3-1.2+T equivalent, key selection criteria include guaranteed 1.225V output tolerance at 100µA, no external capacitor requirement, capacitive-load tolerance, and SC70 footprint compatibility with space-constrained PCB layouts.
Technical Context
The LM4051AIM3-1.2+T implements a laser-trimmed bandgap core with BiCMOS process technology to achieve stable reverse breakdown voltage regulation without series pass elements. Its two-terminal shunt architecture sinks variable current to maintain constant cathode-to-anode voltage under varying load conditions.
It operates across full industrial temperature range (–40°C to +125°C) with guaranteed dynamic impedance ≤1.5Ω at 1mA/120Hz and long-term stability of 120ppm over 1000 hours. Pin 3 is NC and must be left floating or tied to pin 2 per datasheet specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V ±1.2mV at +25°C (Grade A); enables precise low-voltage reference for 12-bit+ data converters |
| Initial Accuracy | ±0.1% max at +25°C; reduces calibration overhead in production test |
| Tempco | ±15ppm/°C max over –40°C to +125°C; ensures <±0.125% drift across full operating range |
| Operating Current | 60µA to 15mA shunt range; supports micropower sensor nodes and high-current reference buffering |
| Noise (10Hz–10kHz) | 28µVRMS; minimizes quantization error in high-resolution analog-to-digital conversion |
| Dynamic Impedance | ≤1.5Ω at 1mA/120Hz; maintains regulation stability during fast load transients |
| Long-Term Stability | 120ppm over 1000h; ensures reference integrity in unattended field-deployed systems |
Pinout & Package
LM4051AIM3-1.2+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. The package is RoHS-compliant and lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (cathode referenced) | Positive terminal; connects to system ground or low-impedance return path in shunt configuration |
| 2 (−) | Cathode | Negative terminal; output node where regulated 1.225V appears relative to pin 1 |
| 3 (N.C.) | No Connection | Must be left floating or shorted to pin 2; not internally bonded - incorrect connection risks parametric shift |
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 hearing aids |
| No output capacitor required | Stable with any capacitive load (0–∞), eliminating BOM cost and layout sensitivity to decoupling |
| Wide shunt current range | 60µA minimum start-up current enables operation from weak bias sources (e.g., high-Z dividers) |
| Low 28µVRMS noise | Directly improves ENOB in 16-bit SAR ADCs without external filtering or post-regulation |
| Guaranteed –40°C to +125°C operation | Validated performance across automotive under-hood and industrial motor-control ambient extremes |
Applications
| Portable Medical Sensors | Battery Fuel Gauging |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) front-end measuring microamp-level electrochemical currents. IC Role / Device Role / Timing Role: Provides stable 1.225V reference for 16-bit delta-sigma ADC converting sensor output. Use Value: ±0.1% initial accuracy and ±15ppm/°C tempco ensure <0.05% measurement error across body-temperature range (32–42°C). | Use Scenario: Smart battery pack monitoring voltage, temperature, and charge state in Li-ion power tools. IC Role / Device Role / Timing Role: Supplies reference for coulomb counter IC and cell-voltage ADCs. Use Value: 60µA min operating current allows direct bias from battery via high-value resistor, extending shelf life. |
| Industrial Data Acquisition | Automotive Cabin Control |
Use Scenario: 4–20mA loop-powered transmitter conditioning thermocouple and RTD signals. IC Role / Device Role / Timing Role: Precision reference for signal-conditioning PGA and 24-bit ΣΔ ADC. Use Value: 28µVRMS noise prevents degradation of effective resolution below 20-bit ENOB. | Use Scenario: HVAC control module measuring cabin temperature and humidity with microcontroller ADC. IC Role / Device Role / Timing Role: Low-drift reference for internal ADC used in closed-loop climate feedback. Use Value: Guaranteed operation to +125°C enables placement near engine bay electronics without derating. |
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 output (1.24V–18V); 0.5% initial accuracy; higher 75ppm/°C tempco; SOT23-3 package | Requires two external resistors for 1.225V setting; less accurate and less stable over temperature | Select only if adjustable output or higher voltage capability is needed; not drop-in for fixed 1.225V use |
| REF3012AIDBZR | 1.2V output; ±0.2% initial accuracy; 50ppm/°C tempco; SC70-3; 50µA–25mA range | Slightly lower nominal voltage (1.2V vs. 1.225V); looser initial tolerance; higher noise (45µVRMS) | Acceptable where 1.2V suffices and tighter tempco is not required; verify system gain calibration impact |
Compared with TLVH431ACDBVR and REF3012AIDBZR, LM4051AIM3-1.2+T delivers superior initial accuracy (±0.1%), lower tempco (±15ppm/°C), and lower noise-making it optimal for high-precision, low-power, fixed-voltage reference roles where board space and long-term stability are critical.
Availability
LM4051AIM3-1.2+T is available at Aetrix Electronics and suitable for portable medical sensors, battery fuel gauging, and industrial data acquisition requiring stable component supply with guaranteed long-term availability and RoHS-compliant sourcing.
Supply support for LM4051AIM3-1.2+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 demanding industrial, automotive, and medical applications.
The LM4050/LM4051 family was engineered specifically for space-constrained, high-accuracy shunt reference needs-emphasizing micropower operation, SC70 packaging, and guaranteed performance across extended temperature ranges.
FAQ
What is the exact output voltage tolerance of LM4051AIM3-1.2+T at +25°C?
The LM4051AIM3-1.2+T has a reverse breakdown voltage of 1.225V with ±1.2mV (±0.1%) tolerance at +25°C, corresponding to the 'A' grade specification. This is verified by 100% production testing and applies strictly under IR = 100µA conditions per the datasheet's Electrical Characteristics table for 1.225V devices.
Can LM4051AIM3-1.2+T operate without an external output capacitor?
Yes, LM4051AIM3-1.2+T does not require an external output capacitor and remains stable with any capacitive load-including zero capacitance or multi-microfarad bulk capacitors. This eliminates layout sensitivity and reduces BOM count, confirmed by stability testing across 0–10µF loads in the datasheet's Applications Information section.
What is the minimum shunt current required for regulation in LM4051AIM3-1.2+T?
The LM4051AIM3-1.2+T requires a minimum shunt current of 60µA to maintain regulation, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold may result in loss of output voltage accuracy and increased tempco deviation, especially at temperature extremes.
Is pin 3 of LM4051AIM3-1.2+T functional or optional?
Pin 3 of LM4051AIM3-1.2+T is designated N.C. (No Connection) and is not internally bonded. Per the Pin Description section, it must be left floating or connected to pin 2 (−); connecting it to any other node may cause unpredictable behavior or parametric shift due to parasitic coupling.
How does LM4051AIM3-1.2+T perform at high temperature?
LM4051AIM3-1.2+T is fully specified from –40°C to +125°C. Its ±15ppm/°C tempco ensures <±0.125% output drift over that range, and its 120ppm long-term stability holds after 1000 hours at +125°C. Thermal derating is unnecessary within the rated junction temperature limit of +150°C when ambient stays ≤+125°C and power dissipation remains within SC70 package limits.
LM4051AIM3-1.2+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:
- ±0.1%
- 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
LM4051AIM3-1.2+T FAQ
1.How can I place an order for LM4051AIM3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AIM3-1.2+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 LM4051AIM3-1.2+T reliable?
The price and inventory of LM4051AIM3-1.2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051AIM3-1.2+T is usually 5 days.
3.What payment methods are accepted for LM4051AIM3-1.2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AIM3-1.2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AIM3-1.2+T?
LM4051AIM3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AIM3-1.2+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 LM4051AIM3-1.2+T?
For technical support, including LM4051AIM3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AIM3-1.2+T requirements.
6.How does Aetrix verify that LM4051AIM3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4051AIM3-1.2+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 LM4051AIM3-1.2+T meets industry standards.
7.What is the process for return or replacement of LM4051AIM3-1.2+T?
All LM4051AIM3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AIM3-1.2+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 LM4051AIM3-1.2+T part is unused and in its original packaging.
Return procedure for LM4051AIM3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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