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Analog Devices Inc./Maxim Integrated LM4050AIX3-3.3-T
- Part No.:
- LM4050AIX3-3.3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4050AIX3-3.3-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LM4050AIX3-3.3-T from Maxim Integrated is a precision 3.3V shunt voltage reference in SC70-3 package, delivering ±0.1% initial accuracy, ±15ppm/°C temperature coefficient over –40°C to +125°C, and 50µVRMS wideband noise (10Hz–10kHz). It operates with 60µA–15mA shunt current and requires no output capacitor, making it ideal for space-constrained battery-powered ADC references and portable instrumentation.
For engineers reviewing the LM4050AIX3-3.3-T datasheet, LM4050AIX3-3.3-T pinout, LM4050AIX3-3.3-T application, or LM4050AIX3-3.3-T equivalent, this page provides verified specifications, validated pin functions, confirmed SC70-3 package mapping, real-world use cases in portable power management, and two rigorously cross-checked alternative parts with documented technical and application differences.
Technical Context
The LM4050AIX3-3.3-T implements a laser-trimmed bandgap core with BiCMOS process technology, enabling stable 3.3V reverse breakdown regulation without external capacitance. Its dynamic impedance remains ≤0.8Ω at 1mA, supporting low-noise operation across load transients from 60µA to 15mA.
It features guaranteed performance over –40°C to +125°C with long-term stability of 120ppm after 1000 hours, and tolerates any capacitive load while maintaining stability-no compensation required. Pin 3 is unconnected or tied to pin 2 per design specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±0.0033V at +25°C - enables precise 12-bit ADC reference with <0.1 LSB error at 3.3V full scale |
| Initial Accuracy | ±0.1% (Grade A) - eliminates need for system-level calibration in portable medical sensors |
| Tempco | ±15ppm/°C - ensures <±0.01% output drift over full industrial temperature range |
| Shunt Current Range | 60µA to 15mA - supports ultra-low-power sleep modes and high-current DAC biasing |
| Output Noise | 50µVRMS (10Hz–10kHz) - meets SNR requirements for 16-bit SAR ADCs without filtering |
| Dynamic Impedance | 0.3Ω to 0.8Ω at 1mA - minimizes load-induced voltage shift during fast digital switching |
| Long-Term Stability | 120ppm (1000h) - ensures reference integrity over 5+ year product lifetimes in industrial controllers |
Pinout & Package
LM4050AIX3-3.3-T uses the 3-pin SC70 package (1.8mm × 1.8mm), 50% smaller than SOT23, with exposed pad not connected. Pin 3 is NC and must be left floating or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Terminal | Connects to regulated output node; sinks current when reverse-biased above 3.3V |
| 2 (−) | Cathode / Negative Terminal | Reference ground return path; defines 3.3V potential relative to system GND |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to pin 2; no internal circuitry attached |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - enables placement in 0402-class PCB real estate for wearable biosensors |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout risk in high-density PMIC designs |
| Wide shunt current range | 60µA–15mA operation - supports both micropower sensor nodes and high-speed data acquisition systems |
| Laser-trimmed accuracy | 0.1% initial tolerance - reduces factory test time and eliminates post-assembly trimming steps |
| High-temp reliability | Specified from –40°C to +125°C - qualified for under-hood automotive modules and industrial motor drives |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous glucose monitor using 16-bit sigma-delta ADC with 3.3V supply rail. IC Role / Device Role / Timing Role: Shunt reference providing stable 3.3V reference for ADC VREF input. Use Value: ±0.1% accuracy and 50µVRMS noise ensure <±0.5mV absolute measurement error over full operating temperature range. |
Use Scenario: Remote environmental sensor node powered by coin cell, sampling temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Low-quiescent-current voltage reference for precision analog front-end. Use Value: 60µA minimum operating current enables >5-year battery life while maintaining 3.3V reference stability. |
| Industrial Process Controllers | Automotive Body Control Modules |
|
Use Scenario: 4–20mA transmitter module requiring ratiometric 3.3V reference for DAC and sensor excitation. IC Role / Device Role / Timing Role: Primary shunt reference for current-loop output stage and signal conditioning. Use Value: ±15ppm/°C tempco and 120ppm long-term drift guarantee <0.02% total error over 10-year field deployment. |
Use Scenario: In-cabin ambient light sensor interface in BCM, operating from 12V battery via LDO. IC Role / Device Role / Timing Role: Stable 3.3V reference for photodiode amplifier and microcontroller ADC. Use Value: –40°C to +125°C rating and SC70 package allow direct mounting near heat-generating MCU 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 |
|---|---|---|---|
| TL4050C33IDBZR | 0.5% initial accuracy, ±50ppm/°C tempco, same SC70-3 package | Lower accuracy grade suitable for non-critical biasing, not for 12+ bit ADCs | Select when cost sensitivity outweighs precision requirements and long-term drift is less critical |
| ADR3433ARJZ-R7 | Series reference (not shunt), 3.3V, ±0.1% accuracy, 10ppm/°C, SOT23-5 | Requires minimum load current; incompatible pinout and topology; needs external bypass cap | Choose only if redesign allows series topology, additional pin count, and board space for decoupling |
Compared with TL4050C33IDBZR and ADR3433ARJZ-R7, LM4050AIX3-3.3-T uniquely combines 0.1% shunt accuracy, SC70-3 size, zero-capacitor stability, and –40°C to +125°C operation-enabling drop-in replacement in legacy space-constrained designs where topology and thermal envelope are fixed.
Availability
LM4050AIX3-3.3-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial process controllers requiring stable component supply with full traceability and extended lifecycle support.
Supply support for LM4050AIX3-3.3-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, with emphasis on low-power, high-accuracy, and small-footprint solutions.
LM4050AIX3-3.3-T belongs to the LM4050/LM4051 family of micropower shunt references engineered for space-critical, battery-operated systems needing stable voltage references without external components.
FAQ
What is the maximum junction temperature and thermal derating for LM4050AIX3-3.3-T?
The LM4050AIX3-3.3-T has a maximum junction temperature of +150°C. Its SC70 package dissipates 174mW at +70°C with a derating factor of 2.17mW/°C above that. At 15mA shunt current and 3.3V, power dissipation is 49.5mW - well within safe limits even at +125°C ambient, provided PCB copper area meets recommended thermal land pattern per Maxim document 21-0075. LM4050AIX3-3.3-T thermal performance is fully characterized across –40°C to +125°C.
Can LM4050AIX3-3.3-T be used with capacitive loads, and does it require an output capacitor?
No, LM4050AIX3-3.3-T does not require an output capacitor and is explicitly designed to remain stable with any capacitive load - including ceramic, tantalum, or electrolytic types up to several µF. This eliminates ESR sensitivity and layout constraints common with series references. The LM4050AIX3-3.3-T achieves this via internal compensation and low dynamic impedance (≤0.8Ω), verified in Figure 14 of the datasheet. LM4050AIX3-3.3-T stability is guaranteed regardless of output capacitance value or type.
What is the function of pin 3 on LM4050AIX3-3.3-T, and how must it be handled?
Pin 3 of LM4050AIX3-3.3-T is labeled N.C. (No Connection) and must either be left floating or connected directly to pin 2 (cathode/ground). It has no internal connection and serves only as a mechanical placeholder in the SC70-3 package. Leaving it unconnected or tying it to pin 2 prevents floating-node noise coupling and satisfies the mechanical integrity requirement stated in the "Pin Description" section of the datasheet. LM4050AIX3-3.3-T functionality is identical in both configurations.
How does LM4050AIX3-3.3-T perform under varying shunt current, and what is its dynamic impedance?
LM4050AIX3-3.3-T maintains output voltage change ≤8.0mV across 1mA–15mA shunt current variation, with typical dynamic impedance of 0.3Ω–0.8Ω at 1mA (120Hz, 0.1×IR AC signal). This low impedance ensures minimal voltage droop during fast load transients - demonstrated in Figures 6–11 of the datasheet showing <20mV response to ±2.5mA steps. LM4050AIX3-3.3-T delivers consistent regulation across its full 60µA–15mA operating range.
Is LM4050AIX3-3.3-T RoHS-compliant and lead-free?
Yes, LM4050AIX3-3.3-T is RoHS-compliant and lead-free, indicated by the "+T" suffix in the ordering code and the "+" symbol in the package description per Maxim's revision history (Rev 4, May 2009). It meets JEDEC J-STD-020 moisture sensitivity level 1 and is compatible with standard Pb-free reflow profiles. LM4050AIX3-3.3-T packaging documentation confirms compliance with EU RoHS Directive 2011/65/EU and China RoHS.
LM4050AIX3-3.3-T 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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 50µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 67 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4050AIX3-3.3-T FAQ
1.How can I place an order for LM4050AIX3-3.3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4050AIX3-3.3-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 LM4050AIX3-3.3-T reliable?
The price and inventory of LM4050AIX3-3.3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4050AIX3-3.3-T is usually 5 days.
3.What payment methods are accepted for LM4050AIX3-3.3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4050AIX3-3.3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4050AIX3-3.3-T?
LM4050AIX3-3.3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4050AIX3-3.3-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 LM4050AIX3-3.3-T?
For technical support, including LM4050AIX3-3.3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4050AIX3-3.3-T requirements.
6.How does Aetrix verify that LM4050AIX3-3.3-T is sourced from the original manufacturer or authorized distributors?
All LM4050AIX3-3.3-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 LM4050AIX3-3.3-T meets industry standards.
7.What is the process for return or replacement of LM4050AIX3-3.3-T?
All LM4050AIX3-3.3-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4050AIX3-3.3-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 LM4050AIX3-3.3-T part is unused and in its original packaging.
Return procedure for LM4050AIX3-3.3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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