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Analog Devices Inc./Maxim Integrated LM4041AEX3-1.2-T
- Part No.:
- LM4041AEX3-1.2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4041AEX3-1.2-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,096
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Product details
Overview
LM4041AEX3-1.2-T from Maxim Integrated is a precision two-terminal shunt voltage reference with 1.225V fixed reverse breakdown voltage, 0.1% initial accuracy, 100ppm/°C max temperature coefficient, and guaranteed operation from –40°C to +125°C in the 3-pin SC70 package. It delivers stable reference voltage for ADC biasing, sensor excitation, and portable power monitoring circuits.
For engineers reviewing the LM4041AEX3-1.2-T datasheet, LM4041AEX3-1.2-T pinout, LM4041AEX3-1.2-T application, or LM4041AEX3-1.2-T equivalent, key selection criteria include shunt current range (60µA–12mA), low 20µVRMS noise (10Hz–10kHz), no external capacitor requirement, and thermal stability across industrial temperature extremes.
Technical Context
The LM4041AEX3-1.2-T implements a bandgap-based shunt architecture that maintains a precise 1.225V output under reverse bias without requiring forward conduction. Its internal BiCMOS process enables laser-trimmed resistor matching for tight initial tolerance and low dynamic impedance (≤1.5Ω at 1mA).
It operates as a two-terminal device where terminal polarity defines cathode/anode behavior: Pin 1 (+) and Pin 2 (−) form the shunt path, while Pin 3 is NC (must float or tie to Pin 2). Stability is maintained across capacitive loads up to 1µF and over full operating current (60µA–12mA) and temperature (–40°C to +125°C) ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V ±1.2mV at +25°C - ensures sub-0.1% absolute accuracy for 12-bit+ data converters |
| Initial Accuracy | 0.1% max - guarantees ≤±1.23mV deviation at room temperature before thermal drift |
| Temp Coefficient | 100ppm/°C max - limits worst-case drift to ±12.25mV over –40°C to +125°C span |
| Shunt Current Range | 60µA to 12mA - supports ultra-low-power sensor nodes and high-current reference buffering |
| Dynamic Impedance | ≤1.5Ω at 1mA - minimizes output voltage shift during load transients in precision feedback loops |
| Output Noise | 20µVRMS (10Hz–10kHz) - preserves SNR in high-resolution analog signal chains |
| Long-Term Stability | 120ppm over 1000h - reduces calibration drift in field-deployed instrumentation |
Pinout & Package
The LM4041AEX3-1.2-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 alternatives. Pin 3 must be left floating or connected to Pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Current enters here in shunt configuration; connects to regulated node or ADC reference input |
| 2 (−) | Cathode (negative terminal) | Current exits here; ties to system ground or return path; forms reference voltage drop with Pin 1 |
| 3 (N.C.) | No-connect terminal | Must remain unconnected or tied to Pin 2; not internally bonded - floating improves thermal isolation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area enables placement in space-constrained portable PCBs and wearables |
| No output capacitor required | Stable operation with any capacitive load eliminates BOM cost and layout risk from external C |
| Wide shunt current range | 60µA minimum start-up current allows use with high-value source resistors in battery-powered systems |
| Low wideband noise | 20µVRMS noise floor supports accurate measurement in 16-bit+ SAR and delta-sigma ADC applications |
| Laser-trimmed accuracy | 0.1% initial tolerance eliminates need for post-assembly calibration in production test flow |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered ECG front-end with 16-bit ADC requiring stable 1.225V reference for analog signal conditioning. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precise voltage reference for ADC VREF and op-amp bias networks. Use Value: 0.1% initial accuracy and 100ppm/°C tempco ensure <±2 LSB error over full medical operating temperature range. | Use Scenario: 4–20mA loop-powered transmitter with microcontroller and precision DAC. IC Role / Device Role / Timing Role: Shunt reference supplying stable excitation voltage to RTD bridge and reference for DAC output scaling. Use Value: 60µA–12mA shunt current range accommodates varying loop supply voltages while maintaining regulation. |
| Automotive Cabin Sensors | Smart Energy Meters |
Use Scenario: Occupancy detection module using thermopile sensor and low-power MCU in vehicle cabin. IC Role / Device Role / Timing Role: Reference voltage source for thermopile amplifier gain-setting and ADC conversion reference. Use Value: Guaranteed –40°C to +125°C operation meets AEC-Q200 ambient requirements without derating. | Use Scenario: Polyphase electricity meter with isolated metrology IC requiring traceable voltage reference. IC Role / Device Role / Timing Role: Primary shunt reference for metrology ADC and secondary reference for RTC power-fail detection. Use Value: 120ppm long-term stability reduces annual recalibration frequency in utility-grade metering. |
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 | 2.5V fixed output; 0.5% initial accuracy; 90ppm/°C tempco; SOT23-3 package | Higher output voltage requires level-shifting for 1.225V systems; less suitable for low-voltage rail sensing | Select when 2.5V reference suffices and tighter tempco is prioritized over initial accuracy |
| ADR3412ARJZ-R7 | 1.2V output; 0.1% initial accuracy; 30ppm/°C tempco; SOT23-3 package; 3-terminal series topology | Series architecture demands different biasing; higher quiescent current (120µA min); not pin-compatible | Choose for lower tempco-critical applications where board space permits 3-terminal layout and higher supply headroom exists |
Compared with TLVH431ACDBVR and ADR3412ARJZ-R7, the LM4041AEX3-1.2-T uniquely combines 1.225V output, 0.1% accuracy, SC70 size, and true two-terminal simplicity-enabling direct replacement in legacy shunt reference designs without circuit rework.
Availability
LM4041AEX3-1.2-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM4041AEX3-1.2-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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The LM4041 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-reliability systems needing stable 1.225V reference with minimal external components.
FAQ
What is the operating temperature range for LM4041AEX3-1.2-T?
The LM4041AEX3-1.2-T is specified for continuous operation from –40°C to +125°C. This extended industrial temperature grade is confirmed by its "E" suffix in the ordering code and validated in the Absolute Maximum Ratings table. The device maintains 0.1% initial accuracy and 100ppm/°C tempco performance across this full range, making it suitable for under-hood automotive and factory-floor industrial environments where ambient temperatures exceed +85°C.
Does LM4041AEX3-1.2-T require an external output capacitor?
No, the LM4041AEX3-1.2-T does not require an external output capacitor for stability. Its internal design ensures unconditional stability with any capacitive load, including 1µF ceramic capacitors used for local decoupling. This eliminates BOM cost, PCB area, and potential resonance issues associated with external compensation networks-confirmed in both the General Description and Applications Information sections of the datasheet.
What is the minimum shunt current needed for regulation in LM4041AEX3-1.2-T?
The LM4041AEX3-1.2-T requires a minimum shunt current of 60µA to maintain regulation, as specified in the Electrical Characteristics table under "Minimum Operating Current." This value applies across the full –40°C to +125°C temperature range and ensures stable 1.225V output even in ultra-low-power sleep modes of battery-powered systems.
How is Pin 3 used on LM4041AEX3-1.2-T?
Pin 3 of the LM4041AEX3-1.2-T is labeled N.C. (No Connect) and must either be left floating or connected directly to Pin 2 (−). Per the Pin Description section, this terminal is not internally bonded and serves no active function; connecting it to Pin 2 improves thermal symmetry but does not affect electrical performance. Leaving it unconnected is electrically identical and commonly used in production layouts.
What is the typical output noise of LM4041AEX3-1.2-T?
The LM4041AEX3-1.2-T exhibits 20µVRMS wideband noise over the 10Hz to 10kHz frequency range, measured at 100µA shunt current. This low-noise specification is critical for high-resolution data acquisition systems, as it directly limits the effective number of bits (ENOB) achievable in 16-bit+ ADC applications without additional filtering or averaging.
LM4041AEX3-1.2-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):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 12 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 60 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4041AEX3-1.2-T FAQ
1.How can I place an order for LM4041AEX3-1.2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041AEX3-1.2-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 LM4041AEX3-1.2-T reliable?
The price and inventory of LM4041AEX3-1.2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041AEX3-1.2-T is usually 5 days.
3.What payment methods are accepted for LM4041AEX3-1.2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041AEX3-1.2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041AEX3-1.2-T?
LM4041AEX3-1.2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041AEX3-1.2-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 LM4041AEX3-1.2-T?
For technical support, including LM4041AEX3-1.2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041AEX3-1.2-T requirements.
6.How does Aetrix verify that LM4041AEX3-1.2-T is sourced from the original manufacturer or authorized distributors?
All LM4041AEX3-1.2-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 LM4041AEX3-1.2-T meets industry standards.
7.What is the process for return or replacement of LM4041AEX3-1.2-T?
All LM4041AEX3-1.2-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4041AEX3-1.2-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 LM4041AEX3-1.2-T part is unused and in its original packaging.
Return procedure for LM4041AEX3-1.2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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