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Analog Devices Inc./Maxim Integrated LM4041DEX3-1.2-T
- Part No.:
- LM4041DEX3-1.2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4041DEX3-1.2-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
LM4041DEX3-1.2-T from Maxim Integrated is a precision 1.225V two-terminal shunt voltage reference in SC70-3 package, rated for -40°C to +125°C operation, with 1.0% initial accuracy, 150ppm/°C max temperature coefficient, and 60µA–12mA operating current range-used for stable biasing and ADC/DAC reference in space-constrained industrial sensors.
For engineers reviewing the LM4041DEX3-1.2-T datasheet, LM4041DEX3-1.2-T pinout, LM4041DEX3-1.2-T application, or LM4041DEX3-1.2-T equivalent, key selection criteria include guaranteed extended-temperature performance, no-output-capacitor stability, low dynamic impedance (≤2.0Ω), and compatibility with high-impedance source networks in battery-powered instrumentation.
Technical Context
The LM4041DEX3-1.2-T implements a bandgap-based shunt reference architecture with laser-trimmed resistors to achieve 1.0% initial accuracy at +25°C and ±24mV overtemperature tolerance across -40°C to +125°C. Its internal pass transistor regulates by sinking variable current through an external series resistor (RS) to maintain fixed 1.225V across terminals.
It operates without external stabilization capacitance and remains stable under any capacitive load due to inherent low output impedance (<2.0Ω at 120Hz) and wideband noise of 20µVRMS (10Hz–10kHz). The device tolerates forward currents up to 10mA and reverse currents up to 20mA absolute maximum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal; ±12mV tolerance at +25°C ensures predictable ADC full-scale alignment in 12-bit systems. |
| Initial Accuracy | ±1.0% (max); corresponds to ±12.25mV error at room temperature-sufficient for industrial sensor calibration without trimming. |
| Temp Coefficient | 150ppm/°C (max); contributes ≤18.4mV drift over full -40°C to +125°C range-critical for unheated outdoor measurement nodes. |
| Operating Current | 60µA to 12mA; enables ultra-low-power wake-up references (e.g., 60µA in sleep mode) and robust regulation under 10mA load transients. |
| Dynamic Impedance | ≤2.0Ω (max at 1mA); maintains <2mV output shift during 1mA load steps-essential for precision analog front-ends. |
| Output Noise | 20µVRMS (10Hz–10kHz); supports 16-bit SAR ADCs without additional filtering in portable data loggers. |
| Temperature Range | -40°C to +125°C; qualified for under-hood automotive sensors and industrial PLC I/O modules without derating. |
Pinout & Package
LM4041DEX3-1.2-T uses the 3-pin SC70-3 surface-mount package (1.8mm × 1.8mm × 0.9mm), 50% smaller than SOT23-3, optimized for high-density PCB layouts in portable and embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Reference Terminal | Connected to system ground or low-impedance return path; defines reference potential for downstream circuitry. |
| 2 (−) | Cathode / Negative Reference Terminal | Connected to regulated voltage node; sinks shunt current to maintain 1.225V across terminals 1 and 2. |
| 3 (N.C.) | No-Connect Terminal | Must be left floating or tied to pin 2; no internal connection-omitting this causes no functional impact but avoids unintended parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | Enables placement in <2mm² board area-ideal for wearables and miniaturized IoT sensor nodes where SOT23 is prohibitive. |
| No output capacitor required | Eliminates BOM cost and layout risk associated with capacitor selection, aging, and ESR variation in field-deployed equipment. |
| Tolerates any capacitive load | Supports direct connection to ADC input capacitors or long PCB traces without oscillation-reduces design iterations. |
| Low 20µVRMS broadband noise | Meets SNR requirements for 16-bit converters without post-regulation filtering, simplifying analog signal chain design. |
| Guaranteed 125°C operation | Validated for continuous use in sealed enclosures or near heat sources (e.g., motor drives, power supplies) without thermal derating. |
Applications
| Portable Medical Sensors | Industrial Temperature Transmitters |
|---|---|
|
Use Scenario: Battery-powered handheld pulse oximeters requiring stable reference for analog front-end amplification and 12-bit ADC conversion. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing 1.225V bias point for op-amp gain stages and ADC reference input. Use Value: 60µA minimum operating current extends battery life beyond 12 months; SC70-3 size fits within 8mm × 8mm PCB footprint. |
Use Scenario: 4–20mA loop-powered RTD transmitter operating in factory environments with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Precision shunt reference establishing excitation voltage for Wheatstone bridge and ADC reference for digitizing bridge output. Use Value: 150ppm/°C tempco and -40°C to +125°C rating ensure <0.1% total error contribution across full industrial temperature range. |
| Automotive Cabin Air Quality Modules | Smart Grid Fault Detectors |
|
Use Scenario: Under-dash air quality sensor module exposed to cabin temperature swings (-40°C to +85°C) and powered from 12V battery via LDO. IC Role / Device Role / Timing Role: Shunt reference supplying stable 1.225V to gas sensor interface IC and microcontroller ADC reference. Use Value: No-output-capacitor stability prevents startup glitches during cold cranking; 125°C junction rating accommodates localized heating near HVAC ducts. |
Use Scenario: DIN-rail mounted fault detector monitoring AC line voltage harmonics using isolated sigma-delta ADCs. IC Role / Device Role / Timing Role: Primary voltage reference for isolated ADC reference domain, referenced to secondary-side ground. Use Value: Low 20µVRMS noise preserves harmonic analysis fidelity; SC70-3 package allows dense isolation barrier layout without compromising creepage. |
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 adjustable reference (min 1.24V), 0.5% initial accuracy, 100ppm/°C, SOT23-3, requires external resistors for 1.225V setting. | Not a drop-in replacement: needs resistor network; higher minimum cathode current (80µA); less accurate at exact 1.225V point. | Select when 2.5V or programmable reference is acceptable and board space permits resistor placement. |
| MAX6008AEUR+T | 1.25V shunt reference, 0.2% initial accuracy, 75ppm/°C, SC70-3, 50µA–20mA operating range, 15µVRMS noise. | Higher accuracy and lower tempco-but 1.25V output differs from LM4041DEX3-1.2-T's 1.225V; not interchangeable without circuit recalibration. | Choose when tighter tolerance and lower drift are prioritized and 25mV output offset can be accommodated in system gain scaling. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4041DEX3-1.2-T provides exact 1.225V output with guaranteed 125°C operation and zero external components-making it optimal for legacy designs, space-limited replacements, and systems requiring minimal bill-of-materials.
Availability
LM4041DEX3-1.2-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial temperature transmitters, and automotive cabin air quality modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4041DEX3-1.2-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 applications, emphasizing high reliability and extended-temperature performance.
The LM4041 family delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-temperature systems where accuracy, stability, and minimal external components are critical.
FAQ
What is the output voltage tolerance of LM4041DEX3-1.2-T at +25°C?
The LM4041DEX3-1.2-T has a nominal output voltage of 1.225V with ±1.0% initial accuracy at +25°C, corresponding to a tolerance range of 1.2128V to 1.2373V per the datasheet's electrical characteristics table. This specification is laser-trimmed and guaranteed for each unit shipped.
Does LM4041DEX3-1.2-T require an external output capacitor for stability?
No, LM4041DEX3-1.2-T does not require an external output capacitor for stability. Its internal design ensures unconditional stability with any capacitive load, including direct connection to ADC input capacitors or long PCB traces-eliminating capacitor-related BOM cost and layout constraints.
What is the minimum operating current for LM4041DEX3-1.2-T across its full temperature range?
The LM4041DEX3-1.2-T guarantees stable regulation down to 60µA minimum shunt current across its full -40°C to +125°C operating range. This enables ultra-low-power operation in sleep-mode sensor nodes while maintaining 1.225V reference accuracy.
Can LM4041DEX3-1.2-T be used in automotive under-hood applications?
Yes, LM4041DEX3-1.2-T is rated for -40°C to +125°C operation and qualified for industrial and automotive under-hood environments. Its 150ppm/°C max temperature coefficient and guaranteed performance at 125°C ambient make it suitable for engine control modules and cabin air quality sensors.
What is the pin 3 function on LM4041DEX3-1.2-T, and how should it be handled?
Pin 3 of LM4041DEX3-1.2-T is labeled N.C. (No Connect) and must be left floating or connected to pin 2 (cathode). It has no internal connection; incorrect routing-such as tying it to VCC or leaving it unterminated on high-impedance nets-may introduce leakage paths or noise coupling in sensitive analog circuits.
LM4041DEX3-1.2-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:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4041DEX3-1.2-T FAQ
1.How can I place an order for LM4041DEX3-1.2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041DEX3-1.2-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 LM4041DEX3-1.2-T reliable?
The price and inventory of LM4041DEX3-1.2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041DEX3-1.2-T is usually 5 days.
3.What payment methods are accepted for LM4041DEX3-1.2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041DEX3-1.2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041DEX3-1.2-T?
LM4041DEX3-1.2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041DEX3-1.2-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 LM4041DEX3-1.2-T?
For technical support, including LM4041DEX3-1.2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041DEX3-1.2-T requirements.
6.How does Aetrix verify that LM4041DEX3-1.2-T is sourced from the original manufacturer or authorized distributors?
All LM4041DEX3-1.2-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 LM4041DEX3-1.2-T meets industry standards.
7.What is the process for return or replacement of LM4041DEX3-1.2-T?
All LM4041DEX3-1.2-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4041DEX3-1.2-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 LM4041DEX3-1.2-T part is unused and in its original packaging.
Return procedure for LM4041DEX3-1.2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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