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Analog Devices Inc./Maxim Integrated LM4041BEX3-1.2+T
- Part No.:
- LM4041BEX3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- -
- Datasheet:
-
LM4041BEX3-1.2+T.pdf
- Description:
- IC VREF SHUNT 1.225V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:2,251
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Product details
Overview
LM4041BEX3-1.2+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 0.2% initial accuracy, 100ppm/°C max temperature coefficient, and 60µA–12mA operating current range-used in high-reliability industrial sensor signal conditioning.
For engineers reviewing the LM4041BEX3-1.2+T datasheet, LM4041BEX3-1.2+T pinout, LM4041BEX3-1.2+T application, or LM4041BEX3-1.2+T equivalent, key selection criteria include guaranteed extended-temperature performance, no-output-capacitor stability, low 20µVRMS noise (10Hz–10kHz), and micropower operation down to 60µA.
Technical Context
The LM4041BEX3-1.2+T implements a bandgap-based shunt reference architecture that maintains a stable 1.225V reverse breakdown voltage across its anode and cathode terminals when biased with 60µA–12mA reverse current. It behaves electrically like a precision zener diode but with laser-trimmed resistors enabling tight initial tolerance.
Its internal BiCMOS process ensures low dynamic impedance (≤1.5Ω at 1mA/120Hz) and wide capacitive-load tolerance without external stabilization. Temperature drift is bounded by ±100ppm/°C over -40°C to +125°C, with typical performance within ±15ppm/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V fixed reverse breakdown voltage - sets precise bias point for ADCs, DACs, and comparators. |
| Initial Accuracy | ±0.2% at +25°C - enables <±2.5mV absolute error in 12-bit systems without calibration. |
| Temp Coefficient | 100ppm/°C max - contributes ≤±12.5mV drift over full -40°C to +125°C range. |
| Operating Current | 60µA to 12mA - supports ultra-low-power sensor nodes and high-current reference buffering. |
| Noise (10Hz–10kHz) | 20µVRMS - minimizes quantization uncertainty in precision 16-bit+ data acquisition. |
| Dynamic Impedance | ≤1.5Ω at 1mA - ensures stable regulation under fast load transients up to 10kHz. |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and downhole sensing. |
Pinout & Package
LM4041BEX3-1.2+T uses the 3-pin SC70-3 surface-mount package (1.8mm × 1.8mm × 0.9mm), 50% smaller than SOT23-3. Pin 3 is unconnected (N.C.) 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 system ground or low-impedance return path; defines reference node polarity. |
| 2 (−) | Cathode (negative terminal) | Connected to supply rail via source resistor; reverse-biased to establish 1.225V drop. |
| 3 (N.C.) | No-connect terminal | Must remain unconnected or shorted to Pin 2; not internally bonded-floating improves thermal stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | Enables placement in space-constrained modules such as wearable medical sensors and IoT edge nodes. |
| No output capacitor required | Eliminates BOM cost and layout area for stability components while supporting any capacitive load up to 10µF. |
| Low 20µVRMS broadband noise | Reduces effective number of bits (ENOB) degradation in high-resolution SAR and delta-sigma ADCs. |
| Guaranteed 125°C operation | Supports direct mounting on hot PCB zones near power converters or motor drivers without derating. |
| 60µA minimum operating current | Extends battery life in coin-cell-powered devices beyond 10 years in sleep-mode monitoring applications. |
Applications
| Portable Medical Sensors | Industrial Process Transmitters |
|---|---|
Use Scenario: Battery-powered ECG front-end with 24-bit delta-sigma ADC requiring stable 1.225V reference for analog input scaling. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precision bias voltage for instrumentation amplifier and ADC reference input. Use Value: 0.2% initial accuracy and 100ppm/°C tempco ensure <±0.5% total error over full operating temperature, meeting IEC 60601-2-27 clinical accuracy requirements. | Use Scenario: 4–20mA loop-powered pressure transmitter operating in oil & gas field cabinets at ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Shunt reference establishing excitation voltage for bridge sensor and reference for DAC-controlled current output stage. Use Value: Extended -40°C to +125°C rating allows direct PCB mounting near heat-generating signal conditioning ICs without thermal isolation. |
| Automotive Cabin Sensors | Energy Metering Modules |
Use Scenario: Occupancy detection module using MEMS microphone and ultra-low-power MCU in vehicle cabin, powered from 12V battery via LDO. IC Role / Device Role / Timing Role: Micropower shunt reference supplying accurate VREF to audio ADC and analog comparator for wake-on-sound detection. Use Value: 60µA min operating current enables continuous monitoring with <1µA system quiescent current, extending start-stop battery life. | Use Scenario: DIN-rail mounted smart electricity meter with isolated metrology ASIC requiring stable 1.225V reference for RMS voltage/current measurement. IC Role / Device Role / Timing Role: Primary voltage reference for metrology ADC and secondary reference for anti-tampering voltage monitor circuit. Use Value: Low 20µVRMS noise and <1.5Ω dynamic impedance prevent noise coupling into 0.1% accuracy energy calculations over 10-year product lifetime. |
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 (2.5V min) vs. fixed 1.225V; 0.5% initial accuracy; 90ppm/°C tempco; SOT23-3 only. | Requires external resistor divider for 1.225V output; higher minimum cathode current (80µA); not rated beyond +105°C. | Select TLVH431ACDBVR only if adjustable output or lower-cost sourcing is prioritized over size and extended-temp qualification. |
| ADR3412ARJZ-R7 | Fixed 1.2V output; 0.1% initial accuracy; 30ppm/°C tempco; 100µA–15mA range; TSOT-23-5 (with enable). | Higher accuracy and lower drift, but larger 5-pin package and requires enable control; no N.C. pin configuration. | Select ADR3412ARJZ-R7 when sub-30ppm/°C drift is mandatory and board space permits TSOT-23-5 footprint and control logic. |
Compared with TLVH431ACDBVR and ADR3412ARJZ-R7, the LM4041BEX3-1.2+T uniquely combines SC70-3 size, guaranteed +125°C operation, true two-terminal simplicity (no enable or adjust pins), and optimized 1.225V output for legacy bandgap-compatible designs-making it the preferred choice for compact, high-temp, fixed-voltage reference needs.
Availability
LM4041BEX3-1.2+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial process transmitters, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4041BEX3-1.2+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 industrial, automotive, and communications applications.
The LM4041 product line delivers micropower, high-accuracy shunt references optimized for space-constrained, extended-temperature systems where three-terminal series references are impractical.
FAQ
What is the maximum operating temperature specification for LM4041BEX3-1.2+T?
The LM4041BEX3-1.2+T is fully specified and guaranteed over -40°C to +125°C ambient temperature. This extended temperature grade (denoted by "E" in the part number) is validated per Maxim's production test flow at both extremes, with electrical parameters including reverse breakdown voltage, tempco, and dynamic impedance confirmed across the full range.
Does LM4041BEX3-1.2+T require an external output capacitor for stability?
No, the LM4041BEX3-1.2+T does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load-from 0pF up to at least 10µF-as verified in the datasheet's output impedance vs. frequency and load-transient response plots. This eliminates BOM cost and layout complexity.
What is the function of Pin 3 on LM4041BEX3-1.2+T?
Pin 3 on the LM4041BEX3-1.2+T is labeled N.C. (No Connect) and is not internally bonded. The datasheet explicitly states it must be left floating or connected to Pin 2 (cathode). This configuration prevents parasitic coupling and improves thermal stability-deviating from this risks degraded long-term voltage drift.
How does the 0.2% initial accuracy of LM4041BEX3-1.2+T translate to absolute voltage error at +25°C?
At +25°C, the 0.2% initial accuracy of LM4041BEX3-1.2+T corresponds to a maximum absolute error of ±2.45mV around the nominal 1.225V output (±0.2% × 1.225V = ±2.45mV). This is measured and binned during production test and applies before temperature-induced drift or long-term aging effects.
Can LM4041BEX3-1.2+T be used in forward conduction mode?
Yes, the LM4041BEX3-1.2+T can conduct forward current up to 10mA (anode-to-cathode), behaving like a silicon diode. However, this mode is not intended for regulation-it is only specified for protection or clamping applications. For stable voltage reference operation, it must be operated in reverse breakdown mode with 60µA–12mA cathode-to-anode current.
LM4041BEX3-1.2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- -
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
LM4041BEX3-1.2+T FAQ
1.How can I place an order for LM4041BEX3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041BEX3-1.2+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 LM4041BEX3-1.2+T reliable?
The price and inventory of LM4041BEX3-1.2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041BEX3-1.2+T is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041BEX3-1.2+T transactions.
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LM4041BEX3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041BEX3-1.2+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 LM4041BEX3-1.2+T?
For technical support, including LM4041BEX3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041BEX3-1.2+T requirements.
6.How does Aetrix verify that LM4041BEX3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4041BEX3-1.2+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 LM4041BEX3-1.2+T meets industry standards.
7.What is the process for return or replacement of LM4041BEX3-1.2+T?
All LM4041BEX3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4041BEX3-1.2+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 LM4041BEX3-1.2+T part is unused and in its original packaging.
Return procedure for LM4041BEX3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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