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Texas Instruments LM4041DEM3X-1.2
- Part No.:
- LM4041DEM3X-1.2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4041DEM3X-1.2.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,180
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Product details
Overview
LM4041DEM3X-1.2 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a fixed 1.225 V reverse breakdown voltage with ±12 mV (±1.0%) initial tolerance at 25°C, 100 ppm/°C max temperature coefficient, and stable operation from 60 μA to 12 mA load current. It serves as a compact, capacitor-free reference for ADC biasing and sensor excitation in portable instrumentation.
For engineers reviewing the LM4041DEM3X-1.2 datasheet, LM4041DEM3X-1.2 pinout, LM4041DEM3X-1.2 application, or LM4041DEM3X-1.2 equivalent, key selection criteria include guaranteed operation across −40°C to +125°C, no-output-capacitor stability, low 20 μVrms noise (10 Hz–10 kHz), and compatibility with high-impedance feedback networks in battery-powered systems.
Technical Context
The LM4041DEM3X-1.2 implements a bandgap-based shunt topology with curvature-corrected temperature drift compensation and Zener-zap wafer-level trimming to achieve ±1.0% initial accuracy. Its cathode-anode configuration operates in reverse breakdown mode, sinking current to maintain precise voltage at the cathode node relative to grounded anode.
Designed for extended-temperature automotive and industrial use, it supports full-spec operation from −40°C to +125°C ambient, exhibits ≤0.08% thermal hysteresis after −40°C/+125°C cycling, and maintains <2 mV load regulation over 60 μA–12 mA current range without external stabilization capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225 V nominal; ±12 mV (±1.0%) tolerance at 25°C ensures accurate biasing for 12-bit ADCs without calibration. |
| Temp Coefficient | ≤100 ppm/°C max over −40°C to +125°C; limits voltage drift to ±12.3 mV across full range, critical for precision sensor bridges. |
| Operating Current | 60 μA min to 12 mA max; enables ultra-low-power wake-up circuits and high-current DAC references in same design. |
| Noise (10 Hz–10 kHz) | 20 μVrms; low enough to avoid degrading ENOB in 16-bit SAR ADCs when used as reference source. |
| Dynamic Impedance | 0.5–1.5 Ω at 1 mA; ensures minimal output voltage shift under fast transient loads typical in microcontroller ADC sampling bursts. |
| Long-Term Stability | 120 ppm over 1000 hrs; supports 10-year field reliability in energy metering and process control without recalibration. |
| Thermal Hysteresis | 0.08% after −40°C/+125°C cycling; guarantees repeatable voltage on power-up after thermal stress in automotive ECUs. |
Pinout & Package
SOT-23-3 package (1.30 mm × 2.92 mm body) with gull-wing leads; thermally optimized for PCB copper pour attachment to manage 291.9°C/W junction-to-ambient resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Must be connected to system ground; defines voltage reference point for cathode output; floating anode disables regulation. |
| Cathode (Pin 1) | Shunt output terminal | Sinks current to hold 1.225 V between cathode and anode; connects to load top rail or ADC REF+; requires series resistor from supply. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to anode per datasheet; not usable as feedback or trim node. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with any capacitive load (0–∞), eliminating BOM cost and board space for bulk decoupling in wearables and IoT nodes. |
| Extended temperature grade | Qualified for −40°C to +125°C operation (Grade D), enabling direct use in engine control modules and industrial motor drives. |
| Low quiescent current | 60 μA minimum operating current allows integration into always-on battery monitors with multi-year shelf life. |
| Low noise performance | 20 μVrms wideband noise preserves signal integrity in precision analog front-ends for medical sensors and strain gauges. |
| High accuracy trimming | Fuse/Zener-zap wafer sort achieves ±1.0% initial tolerance, reducing post-manufacturing calibration steps in production test. |
Applications
| Portable Data Loggers | Automotive Cabin Sensors |
|---|---|
Use Scenario: Battery-powered environmental monitor logging temperature/humidity every 5 minutes using a 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for ADC conversion, directly replacing larger 2.5 V references to match sensor output range. Use Value: 60 μA minimum current enables >5-year battery life on CR2032; no capacitor reduces footprint by 0.8 mm² vs. LDO-based solutions. |
Use Scenario: Occupant detection system using capacitive touch sensing in vehicle seats, operating across under-hood temperature extremes. IC Role / Device Role / Timing Role: Supplies excitation voltage for capacitance-to-digital converter (CDC) front-end, referenced to vehicle chassis ground. Use Value: 100 ppm/°C tempco ensures <±1 LSB error over −40°C to +85°C seat temperature range; AEC-Q100 Grade 1 qualification confirms automotive suitability. |
| Industrial Process Transmitters | Precision Audio Biasing |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART communication, requiring stable internal reference for DAC and ADC. IC Role / Device Role / Timing Role: Shunt reference establishes precise 1.225 V for 12-bit DAC output scaling and sensor bridge excitation. Use Value: 12 mA max current supports simultaneous DAC drive and sensor bias; long-term stability (120 ppm/1000 hrs) meets SIL-2 functional safety drift requirements. |
Use Scenario: Low-noise headphone amplifier IC requiring clean DC bias for input stage FETs in portable audio DACs. IC Role / Device Role / Timing Role: Generates ultra-low-noise 1.225 V bias rail decoupled from noisy digital supply domains. Use Value: 20 μVrms noise floor prevents audible hiss; SOT-23-3 package allows placement adjacent to amplifier die with minimal trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4041CIM3X-1.2 | ±0.5% initial tolerance (±6 mV), same 100 ppm/°C tempco and SOT-23-3 package | Better accuracy for 14-bit data acquisition where ±1 LSB error budget demands tighter reference tolerance | Select when higher initial accuracy justifies minor cost premium; identical pinout and layout. |
| TLVH431ACDBVR | Adjustable 1.24–18 V output via external resistors; 2% initial tolerance; 50 ppm/°C tempco; SOT-23-5 package | Supports programmable reference voltages but requires two external resistors and has higher minimum cathode current (80 μA) | Choose when system needs multiple reference levels or future voltage flexibility; verify PCB pad compatibility with 5-pin layout. |
Compared with LM4041CIM3X-1.2, the LM4041DEM3X-1.2 trades 0.5% accuracy for broader automotive temperature qualification; versus TLVH431ACDBVR, it offers lower noise and simpler fixed-voltage implementation but lacks adjustability.
Availability
LM4041DEM3X-1.2 is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin sensors, and industrial process transmitters requiring stable component supply with guaranteed long-term availability and automotive-grade reliability.
Supply support for LM4041DEM3X-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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and automotive-qualified components.
The LM4041-N family was designed for space-constrained, battery-sensitive applications needing high-accuracy voltage references without external capacitors-targeting portable medical devices, automotive subsystems, and industrial IoT endpoints.
FAQ
What is the maximum operating temperature range for the LM4041DEM3X-1.2?
The LM4041DEM3X-1.2 is rated for operation from −40°C to +125°C ambient temperature, meeting AEC-Q100 Grade 1 automotive requirements. This extended range is confirmed in Section 6.7 of the SNOS641G datasheet, where electrical characteristics are specified across this full interval with ≤100 ppm/°C temperature coefficient and ≤2 mV load regulation drift.
Does the LM4041DEM3X-1.2 require an external output capacitor for stability?
No, the LM4041DEM3X-1.2 does not require an external output capacitor. Its internal design ensures stability with any capacitive load-including zero capacitance-due to advanced compensation that eliminates the need for external stabilization. This is explicitly stated in the "Features" section and verified in the "Application and Implementation" chapter of the LM4041-N datasheet.
What is the minimum cathode current needed for regulation in the LM4041DEM3X-1.2?
The LM4041DEM3X-1.2 requires a minimum cathode current of 60 μA to maintain regulation, as specified in Section 6.3 ("Recommended Operating Conditions") and Table 6.7 of the SNOS641G datasheet. Below this threshold, output voltage deviates from the 1.225 V nominal value, making it unsuitable for ultra-low-power sleep modes drawing <50 μA.
How does the LM4041DEM3X-1.2 compare to the LM4041AIM3X-1.2 in accuracy?
The LM4041DEM3X-1.2 has ±1.0% (±12 mV) initial tolerance at 25°C, while the LM4041AIM3X-1.2 offers ±0.1% (±1.2 mV) tolerance. Both share identical 100 ppm/°C temperature coefficient and SOT-23-3 packaging. The D-grade part targets cost-sensitive automotive and industrial applications where Grade 1 temperature range outweighs the need for A-grade precision.
Can the LM4041DEM3X-1.2 be used in place of a 1.2 V Zener diode?
Yes-the LM4041DEM3X-1.2 replaces discrete Zener diodes with superior performance: tighter initial tolerance (±1.0% vs. typical ±5%), lower dynamic impedance (0.5–1.5 Ω vs. 10–100 Ω), and guaranteed operation down to 60 μA. Unlike Zeners, it requires no minimum current spec beyond 60 μA and delivers consistent 1.225 V across temperature without derating.
LM4041DEM3X-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:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 73 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4041DEM3X-1.2 FAQ
1.How can I place an order for LM4041DEM3X-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041DEM3X-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 LM4041DEM3X-1.2 reliable?
The price and inventory of LM4041DEM3X-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 LM4041DEM3X-1.2 is usually 5 days.
3.What payment methods are accepted for LM4041DEM3X-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041DEM3X-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041DEM3X-1.2?
LM4041DEM3X-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041DEM3X-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 LM4041DEM3X-1.2?
For technical support, including LM4041DEM3X-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041DEM3X-1.2 requirements.
6.How does Aetrix verify that LM4041DEM3X-1.2 is sourced from the original manufacturer or authorized distributors?
All LM4041DEM3X-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 LM4041DEM3X-1.2 meets industry standards.
7.What is the process for return or replacement of LM4041DEM3X-1.2?
All LM4041DEM3X-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4041DEM3X-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 LM4041DEM3X-1.2 part is unused and in its original packaging.
Return procedure for LM4041DEM3X-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4041DEM3X-1.2 Tags
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