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Analog Devices Inc./Maxim Integrated LM4050AIM3-2.1+
- Part No.:
- LM4050AIM3-2.1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4050AIM3-2.1+.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:4,330
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Product details
Overview
LM4050AIM3-2.1+ from Maxim Integrated is a precision 2.048V shunt voltage reference in SOT23-3 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 in portable battery-powered systems requiring minimal board space and low quiescent current.
For engineers reviewing the LM4050AIM3-2.1+ datasheet, LM4050AIM3-2.1+ pinout, LM4050AIM3-2.1+ application, or LM4050AIM3-2.1+ equivalent, key selection criteria include guaranteed reverse breakdown voltage tolerance (±2.0mV at +25°C), no external capacitor requirement, stability with capacitive loads, and compatibility with high-temperature industrial environments up to +125°C.
Technical Context
The LM4050AIM3-2.1+ uses a laser-trimmed bandgap architecture to deliver precise 2.048V reverse breakdown voltage with minimal drift across temperature and load. Its two-terminal shunt topology sinks current through an external series resistor to maintain regulation without feedback loops or external components.
It operates as a passive voltage clamp-behaving like an ideal Zener diode-requiring only a minimum 60µA shunt current for regulation and tolerating up to 15mA while maintaining <8.0mV output voltage change across its full current range. Dynamic impedance remains ≤0.8Ω at 1mA, enabling fast transient response in precision ADC and DAC reference circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±2.0mV tolerance at +25°C ensures accurate 12-bit ADC/DAC reference alignment. |
| Initial Accuracy | 0.1% (A-grade); guarantees absolute voltage error ≤±2.05mV at room temperature for calibration-critical designs. |
| Tempco | ±15ppm/°C max; contributes ≤±1.5mV drift over –40°C to +125°C, supporting industrial-grade stability. |
| Operating Current | 60µA to 15mA; enables ultra-low-power sensor nodes and high-current reference buffering without redesign. |
| Noise (10Hz–10kHz) | 28µVRMS; low enough to avoid degrading ENOB in 16-bit SAR ADCs when used as reference source. |
| Dynamic Impedance | ≤0.8Ω at 1mA; minimizes load-induced voltage sag during fast digital switching events. |
| Long-Term Stability | 120ppm over 1000h; supports 10+ year field reliability in unattended instrumentation. |
Pinout & Package
LM4050AIM3-2.1+ is housed in a RoHS-compliant 3-pin SOT23-3 surface-mount package (2.92mm × 1.3mm × 1.0mm), optimized for automated assembly and thermal performance in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Terminal | Connected to system ground or low-impedance return path; forms cathode-to-anode reverse bias path. |
| 2 (−) | Cathode / Negative Terminal | Reference output node; voltage is regulated relative to this terminal; connects to load and series resistor. |
| 3 (N.C.) | No Connection | Must be left floating or tied to Pin 2; no internal connection-leaving unconnected avoids parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-stable 2.048V output | Matches standard 12-bit DAC/ADC full-scale reference points; eliminates scaling errors in data acquisition. |
| No output capacitor required | Reduces BOM count and layout area; simplifies design for space-constrained wearables and IoT sensors. |
| Stable with capacitive loads | Supports direct connection to ADC input caps or filtering networks without oscillation risk. |
| Wide 60µA–15mA current range | Enables single-part reuse across low-power sleep modes and active high-speed conversion cycles. |
| SC70/SOT23-compatible footprint | Facilitates drop-in replacement between SC70-3 and SOT23-3 variants (e.g., LM4050AEX3-2.1+) without layout changes. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG front-end with 16-bit sigma-delta ADC requiring stable reference over 10-year service life. IC Role / Device Role / Timing Role: Shunt voltage reference providing 2.048V reference for ADC conversion and analog signal conditioning. Use Value: 0.1% initial accuracy and 120ppm long-term stability ensure diagnostic-grade measurement repeatability without field recalibration. | Use Scenario: Ruggedized environmental monitor deployed in oil-field telemetry units operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Precision reference for RTD and thermocouple signal chains interfaced to microcontroller ADC. Use Value: ±15ppm/°C tempco and guaranteed operation to +125°C enable reliable readings across extreme ambient shifts. |
| Handheld Test Equipment | Smart Energy Meters |
Use Scenario: Portable multimeter with autoranging analog front-end and dual-slope ADC. IC Role / Device Role / Timing Role: Primary voltage reference for DCV and ohms measurement ranges. Use Value: Low 28µVRMS noise prevents resolution loss in sub-mV measurements; 60µA min current supports ultra-low standby power. | Use Scenario: DIN-rail mounted electricity meter with metrology-grade AFE and isolated communication interface. IC Role / Device Role / Timing Role: Reference source for polyphase energy measurement ICs (e.g., ADE78xx) requiring tight gain matching. Use Value: 2.048V output aligns with industry-standard 12-bit reference grids; 0.1% grade ensures Class 0.2 meter compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040CIM3-2.5/NOPB | 2.5V output, 0.5% initial accuracy, 100ppm/°C tempco, same SOT23-3 package | Higher voltage and lower accuracy limit use in 12-bit systems requiring exact 2.048V alignment | Select only if 2.5V suffices and cost sensitivity outweighs precision requirements. |
| REF3020AIDBZR | 2.048V output, 0.2% initial accuracy, 50ppm/°C tempco, SOT23-3, 50µA–25mA current range | Higher quiescent current floor (50µA vs. 60µA) and wider tempco reduce suitability for ultra-low-power cold-chain loggers | Prefer for higher-current buffer stages where REF3020's lower dynamic impedance (0.3Ω) improves transient immunity. |
Compared with LM4040CIM3-2.5/NOPB and REF3020AIDBZR, LM4050AIM3-2.1+ delivers tighter initial accuracy and lower tempco at minimal quiescent current-making it optimal for battery-operated 12-bit measurement systems where voltage alignment and long-term drift are critical.
Availability
LM4050AIM3-2.1+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test equipment, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for LM4050AIM3-2.1+ 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 specifically for space-constrained, high-accuracy voltage reference needs in battery-powered and high-temperature instrumentation-emphasizing micropower operation, SC70/SOT23 compatibility, and guaranteed performance across –40°C to +125°C.
FAQ
What is the guaranteed reverse breakdown voltage tolerance for LM4050AIM3-2.1+ at +25°C?
The LM4050AIM3-2.1+ has a guaranteed reverse breakdown voltage tolerance of ±2.0mV at +25°C (A-grade), corresponding to ±0.1% of its 2.048V nominal output. This specification is laser-trimmed and production-tested per Maxim's datasheet Section "ELECTRICAL CHARACTERISTICS-2.048V", ensuring traceable accuracy for metrology-grade designs.
Does LM4050AIM3-2.1+ require an external output capacitor for stability?
No, LM4050AIM3-2.1+ does not require an external output capacitor for stability. Its internal bandgap architecture and low dynamic impedance (<0.8Ω) ensure unconditional stability with any capacitive load-from 0pF to >1µF-as confirmed in the "Output Capacitance" section of the datasheet and validated in Figure 14 (Output Impedance vs. Frequency).
What is the minimum operating current needed for regulation in LM4050AIM3-2.1+?
The LM4050AIM3-2.1+ requires a minimum shunt current (IRMIN) of 60µA to maintain regulation, as specified in the "ELECTRICAL CHARACTERISTICS-2.048V" table. Below this threshold, output voltage deviates beyond guaranteed limits; design must ensure IR ≥ 60µA under all operating conditions including lowest VS and highest ILOAD.
Can LM4050AIM3-2.1+ be used in applications exceeding +85°C ambient temperature?
Yes, LM4050AIM3-2.1+ is fully specified and guaranteed over –40°C to +125°C ambient temperature. Its BiCMOS process and thermal design support continuous operation at +125°C, provided power dissipation remains within derating limits (e.g., ≤75mW at +125°C ambient with proper PCB copper pour).
How does the pin configuration of LM4050AIM3-2.1+ differ from LM4050AEX3-2.1+?
LM4050AIM3-2.1+ uses SOT23-3 packaging with identical pinout (Pin 1 = +, Pin 2 = −, Pin 3 = N.C.) to LM4050AEX3-2.1+ (SC70-3), enabling direct PCB footprint compatibility. The only physical difference is package size: SOT23-3 measures 2.92mm × 1.3mm vs. SC70-3's 1.8mm × 1.8mm-no pin reassignment or circuit modification is needed for substitution.
LM4050AIM3-2.1+ 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 28µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4050AIM3-2.1+ FAQ
1.How can I place an order for LM4050AIM3-2.1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4050AIM3-2.1+ 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 LM4050AIM3-2.1+ reliable?
The price and inventory of LM4050AIM3-2.1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4050AIM3-2.1+ is usually 5 days.
3.What payment methods are accepted for LM4050AIM3-2.1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4050AIM3-2.1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4050AIM3-2.1+?
LM4050AIM3-2.1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4050AIM3-2.1+ 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 LM4050AIM3-2.1+?
For technical support, including LM4050AIM3-2.1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4050AIM3-2.1+ requirements.
6.How does Aetrix verify that LM4050AIM3-2.1+ is sourced from the original manufacturer or authorized distributors?
All LM4050AIM3-2.1+ 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 LM4050AIM3-2.1+ meets industry standards.
7.What is the process for return or replacement of LM4050AIM3-2.1+?
All LM4050AIM3-2.1+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4050AIM3-2.1+, 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 LM4050AIM3-2.1+ part is unused and in its original packaging.
Return procedure for LM4050AIM3-2.1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4050AIM3-2.1+ Tags
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