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Texas Instruments LM4041EIM3-1.2
- Part No.:
- LM4041EIM3-1.2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4041EIM3-1.2.pdf
- Description:
- IC VREF SHUNT 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,638
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Product details
Overview
LM4041EIM3-1.2 from Texas Instruments is a precision 1.225 V shunt voltage reference in SOT-23 package, rated for extended temperature operation (−40°C to +125°C), with ±2.0% initial tolerance at 25°C, 150 ppm/°C max temperature coefficient, and 20 μVRMS wideband noise (10 Hz–10 kHz). It serves as a stable reference in high-accuracy analog signal chains for battery-powered instrumentation.
For engineers reviewing the LM4041EIM3-1.2 datasheet, LM4041EIM3-1.2 pinout, LM4041EIM3-1.2 application, or LM4041EIM3-1.2 equivalent, key selection criteria include its fixed 1.225 V output, low 65 μA minimum operating current, no-output-capacitor requirement, automotive-grade qualification (AEC-Q100 Grade 1), and compatibility with capacitive loads up to 10 nF.
Technical Context
The LM4041EIM3-1.2 uses a bandgap-based Zener-zap trimmed shunt architecture with curvature-corrected temperature drift compensation, enabling stable reverse breakdown voltage across −40°C to +125°C. Its dynamic impedance remains ≤2 Ω at 1 mA, supporting tight regulation under varying load currents from 65 μA to 12 mA.
Unlike series references, it operates as a two-terminal shunt device requiring only an external current source and load resistor. The SOT-23 package supports board-level EMI resilience when the NC pin is tied to anode, and its 100% production-tested 1.225 V nominal output ensures traceable accuracy without post-manufacture calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225 V nominal; fixed value enables direct use in 1.2 V system biasing and ADC/DAC reference without external resistors |
| Initial Tolerance | ±25 mV (±2.0%) at 25°C; defines maximum deviation before temperature or aging effects |
| Tempco | ±150 ppm/°C max over −40°C to +125°C; limits worst-case drift to ±18.4 mV across full range |
| Min Operating Current | 65 μA at full temperature range; allows ultra-low-power operation in energy-harvesting sensor nodes |
| Noise (10 Hz–10 kHz) | 20 μVRMS; supports 16-bit+ precision in data-acquisition front-ends without added filtering |
| Dynamic Impedance | ≤2 Ω at 1 mA; ensures <1 mV output shift per 2 mA load change, critical for stable feedback loops |
| Long-Term Stability | 120 ppm after 1000 hrs; corresponds to ~1.5 μV drift, suitable for metrology-grade calibration references |
Pinout & Package
SOT-23 (DBZ) 3-pin surface-mount package: 1.30 mm × 2.92 mm body size, 0.95 mm height, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | I/O | Shunt current path and output node; connects to regulated voltage rail; sinks current to maintain 1.225 V |
| Anode (Pin 2) | O | Reference ground terminal; must be connected to system ground; forms return path for shunt current |
| NC (Pin 3) | - | No-connect; must float or tie to Anode (Pin 2) in high-EMI environments to suppress noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables space-constrained PCB layouts in wearables and IoT sensors without stability-compensation components |
| Tolerates capacitive loads | Stable with up to 10 nF load capacitance, simplifying interface to SAR ADC sample-and-hold inputs |
| AEC-Q100 Grade 1 qualified | Validated for automotive ambient temperatures (−40°C to +125°C), supporting engine control and ADAS modules |
| Low 65 μA min operating current | Permits use with high-value current-setting resistors (>150 kΩ at 3.3 V), reducing quiescent power in always-on circuits |
| 20 μVRMS noise (10 Hz–10 kHz) | Meets SNR requirements for 16-bit 100 kSPS data loggers without external low-noise op-amp buffering |
Applications
| Battery-Powered Instrumentation | Data-Acquisition Front-End |
|---|---|
Use Scenario: Portable multimeter measuring DC voltage with 0.1% accuracy over 0–50°C ambient. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V for 24-bit sigma-delta ADC internal reference buffer. Use Value: ±18.4 mV max drift over temperature ensures <0.15% reference error contribution to overall measurement uncertainty. |
Use Scenario: Industrial PLC analog input module digitizing 4–20 mA sensor signals at 1 kSPS. IC Role / Device Role / Timing Role: Precision voltage reference for programmable gain instrumentation amplifier and 16-bit SAR ADC. Use Value: 20 μVRMS noise and ≤2 Ω dynamic impedance prevent gain error and code flicker in high-resolution sampling. |
| Automotive Energy Metering | Precision Audio Biasing |
Use Scenario: Onboard charger monitoring grid-side AC voltage and current with isolation amplifiers. IC Role / Device Role / Timing Role: AEC-Q100 qualified reference for isolated delta-sigma modulator biasing in high-voltage sensing stage. Use Value: Grade 1 qualification and ±150 ppm/°C tempco ensure consistent metering accuracy across vehicle cabin temperature swings. |
Use Scenario: High-fidelity headphone amplifier requiring ultra-low-noise DC bias for Class-AB output stage. IC Role / Device Role / Timing Role: Low-noise shunt reference generating clean 1.225 V for op-amp offset nulling and bias networks. Use Value: 20 μVRMS noise floor avoids audible hiss; no-output-capacitor design eliminates capacitor-induced phase shift in audio paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040CIM3-1.2 | Same 1.225 V output but ±0.5% initial tolerance (±6 mV), 100 ppm/°C max tempco, and industrial temp range only (−40°C to +85°C) | Lacks AEC-Q100 qualification and extended temperature support; unsuitable for under-hood automotive use | Select when cost sensitivity outweighs automotive qualification and tighter tolerance is needed in non-automotive industrial designs |
| REF3012AIDBZR | 1.2 V output, ±0.2% initial tolerance, 50 ppm/°C max tempco, but requires 35 μA min current and has higher 45 μVRMS noise | Series topology demands output capacitor; incompatible with shunt-based current-source architectures | Choose for lower tempco and tighter tolerance where board space allows series reference layout and noise budget permits 45 μVRMS |
Compared with LM4040CIM3-1.2, the LM4041EIM3-1.2 trades initial accuracy for automotive qualification and extended temperature operation; compared with REF3012AIDBZR, it offers lower noise and shunt simplicity but higher tempco and looser tolerance - making it optimal for cost-sensitive, EMI-resilient, high-temp shunt reference roles.
Availability
LM4041EIM3-1.2 is available at Aetrix Electronics and suitable for battery-powered instrumentation, automotive energy metering, and precision data-acquisition systems requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LM4041EIM3-1.2 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and automotive qualification.
The LM4041-N family was engineered for space-constrained, high-reliability applications demanding stable voltage references without external capacitors - particularly targeting automotive, industrial, and portable test equipment markets.
FAQ
What is the maximum operating current for LM4041EIM3-1.2?
The LM4041EIM3-1.2 supports a maximum operating current of 12 mA across its full temperature range (−40°C to +125°C). This limit ensures safe power dissipation within the SOT-23 package's 306 mW rating at 25°C ambient, with appropriate thermal derating above that temperature. Exceeding 12 mA risks exceeding junction temperature limits and compromising long-term reliability.
Does LM4041EIM3-1.2 require an output capacitor for stability?
No, the LM4041EIM3-1.2 does not require an output capacitor for stability. Its internal design provides inherent phase margin across all load conditions, including purely capacitive loads up to 10 nF. This eliminates capacitor-related aging, leakage, and board-space overhead - a key advantage over many competing shunt references.
Is LM4041EIM3-1.2 qualified for automotive applications?
Yes, the LM4041EIM3-1.2 is AEC-Q100 qualified as Grade 1 (−40°C to +125°C ambient), meeting automotive reliability and stress-test requirements. It is explicitly listed in TI's LM4041-N-Q1 product line, with qualification evidence documented in the official datasheet's Features and Device Information sections.
What is the thermal hysteresis specification for LM4041EIM3-1.2?
The LM4041EIM3-1.2 exhibits 0.08% thermal hysteresis - defined as the voltage difference measured at +25°C after cycling to −40°C versus after cycling to +125°C. For its 1.225 V nominal output, this equates to ≤0.98 mV hysteresis error, ensuring repeatable performance in systems subject to repeated thermal cycling.
Can LM4041EIM3-1.2 be used in adjustable-output configurations?
No, the LM4041EIM3-1.2 is a fixed-output variant (1.225 V) and lacks a feedback (FB) pin. Adjustable versions such as LM4041EIM3-ADJ exist separately with dedicated FB pins and different pinouts; substituting LM4041EIM3-1.2 into an adjustable circuit will result in incorrect or unstable output voltage.
LM4041EIM3-1.2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 12 mA
- Tolerance:
- ±2%
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4041EIM3-1.2 FAQ
1.How can I place an order for LM4041EIM3-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041EIM3-1.2 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 LM4041EIM3-1.2 reliable?
The price and inventory of LM4041EIM3-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041EIM3-1.2 is usually 5 days.
3.What payment methods are accepted for LM4041EIM3-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041EIM3-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041EIM3-1.2?
LM4041EIM3-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041EIM3-1.2 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 LM4041EIM3-1.2?
For technical support, including LM4041EIM3-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041EIM3-1.2 requirements.
6.How does Aetrix verify that LM4041EIM3-1.2 is sourced from the original manufacturer or authorized distributors?
All LM4041EIM3-1.2 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 LM4041EIM3-1.2 meets industry standards.
7.What is the process for return or replacement of LM4041EIM3-1.2?
All LM4041EIM3-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4041EIM3-1.2, 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 LM4041EIM3-1.2 part is unused and in its original packaging.
Return procedure for LM4041EIM3-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4041EIM3-1.2 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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