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Texas Instruments LM4041CILPR
- Part No.:
- LM4041CILPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LM4041CILPR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,529
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Product details
Overview
LM4041CILPR from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225 V output, ±0.5% initial tolerance (C grade), 100 ppm/°C max temperature coefficient, 20 μVRMS wideband noise, and stable operation from 45 μA to 12 mA cathode current. It serves as a compact, low-drift voltage reference in high-accuracy analog signal chains for industrial data acquisition and battery-powered instrumentation.
For engineers reviewing the LM4041CILPR datasheet, LM4041CILPR pinout, LM4041CILPR application, or LM4041CILPR equivalent, this page delivers verified specifications, SOT-23-3 pin mapping, real-world use cases in power-supply monitoring and precision audio, and two validated alternative parts with documented technical and application differences.
Technical Context
The LM4041CILPR implements a Zener-based shunt reference architecture trimmed via fuse and Zener-zap during wafer sort to achieve its 0.5% output tolerance. Its dynamic impedance remains below 1.5 Ω at 1 mA, enabling stable regulation under varying load conditions without requiring an output capacitor.
It operates across –40°C to +85°C ambient temperature and maintains low drift via internal compensation - achieving ≤100 ppm/°C over full temperature range and ≤15 ppm/°C at 25°C with 1 mA cathode current. The device draws only 45 μA minimum cathode current, making it suitable for ultra-low-power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V nominal; enables direct replacement of legacy 1.2 V references with tighter accuracy. |
| Initial Tolerance | ±0.5% max at 25°C (C grade); reduces calibration overhead in production test fixtures. |
| Temp Coefficient | ≤100 ppm/°C max over –40°C to +85°C; ensures <±1.2 mV drift across full industrial range. |
| Output Noise | 20 μVRMS (10 Hz–10 kHz); supports 16-bit+ ADCs without additional filtering. |
| Cathode Current Range | 45 μA (min) to 12 mA (max); allows use with high-value bias resistors in battery-critical designs. |
| Dynamic Impedance | ≤1.5 Ω at 1 mA; minimizes output voltage shift under transient load changes. |
| Long-Term Stability | 120 ppm after 1000 h; supports >10-year field reliability in metering applications. |
Pinout & Package
LM4041CILPR is packaged in a 3-pin SOT-23 (DBZ) surface-mount package with JEDEC-standard pinout and RoHS-compliant NiPdAu lead finish. The package measures 2.92 mm × 1.6 mm × 1.1 mm and supports reflow soldering per IPC/JEDEC J-STD-020 Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current sink / output node | Connects to regulated output rail; carries total current (load + reference bias); must be driven above 1.225 V by external resistor. |
| Anode (Pin 2) | Reference ground return | Typically tied to system ground; forms the reference potential for cathode voltage; floating anode disables regulation. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to Anode (Pin 2) per TI recommendation to suppress EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably with any capacitive load (0–∞), eliminating need for output bypass capacitor and reducing BOM count. |
| Micropower operation | 45 μA typical minimum cathode current enables >10-year battery life in wireless sensor nodes using CR2032 cells. |
| Wide temperature range | Specified from –40°C to +85°C; qualified for industrial control cabinets and outdoor energy metering enclosures. |
| Low EMI sensitivity | NC pin (Pin 3) can be grounded to anode to suppress noise pickup near switching regulators or transformers. |
| Zener-zap trimming | Wafer-level precision trimming achieves 0.5% tolerance without post-package laser adjustment, improving yield and cost. |
Applications
| Power-Supply Monitoring | Data-Acquisition Systems |
|---|---|
Use Scenario: Real-time detection of 12 V DC supply sag in PLC I/O modules during motor startup transients. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V threshold for comparator-based undervoltage lockout circuit. Use Value: Enables accurate trip point with <±6.1 mV error over temperature, reducing false trips in harsh factory environments. | Use Scenario: Biasing the reference input of a 16-bit SAR ADC in portable environmental sensor loggers. IC Role / Device Role / Timing Role: Precision voltage reference establishing ADC full-scale range independent of supply rail variation. Use Value: Delivers 20 μVRMS noise floor, preserving effective resolution beyond 15.5 ENOB at 100 kSPS. |
| Precision Audio | Battery-Powered Equipment |
Use Scenario: Setting DC offset and gain in Class-D amplifier feedback networks for studio-grade portable mixers. IC Role / Device Role / Timing Role: Low-noise shunt reference stabilizing op-amp bias points and DAC output buffers. Use Value: 100 ppm/°C drift prevents audible pitch wobble during extended recording sessions in variable ambient conditions. | Use Scenario: Providing reference voltage for coulomb counting in lithium-thionyl chloride (LiSOCl₂) battery monitors used in smart utility meters. IC Role / Device Role / Timing Role: Micropower shunt reference operating continuously at 60 μA to support 15-year service life. Use Value: 45 μA minimum current allows use with MΩ-range bias resistors, minimizing self-discharge impact on primary cell longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACLP | 2.495 V adjustable output; 2% initial tolerance; 50 μA min cathode current; requires external resistors for 1.225 V setup. | Not suitable for space-constrained layouts needing fixed 1.225 V; higher minimum current increases quiescent power. | Select TL431ACLP only when existing designs already use 2.5 V references and board area permits resistor network. |
| REF3012AIDBZR | 1.2 V output; 0.2% initial tolerance; 50 ppm/°C tempco; 50 μA supply current; series topology (not shunt). | Requires dedicated supply rail; cannot replace LM4041CILPR in shunt configurations without circuit redesign. | Choose REF3012AIDBZR only for new designs where series topology simplifies biasing and tighter 0.2% tolerance justifies cost premium. |
Compared with TL431ACLP and REF3012AIDBZR, LM4041CILPR offers the only fixed 1.225 V shunt solution with ≤0.5% tolerance, sub-100 ppm/°C drift, and true micropower operation - enabling drop-in upgrades in legacy SOT-23 footprint designs without layout or schematic changes.
Availability
LM4041CILPR is available at Aetrix Electronics and suitable for industrial data-acquisition systems, battery-powered instrumentation, and precision power-supply monitoring requiring stable component supply and long-term parametric consistency.
Supply support for LM4041CILPR 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 high-reliability manufacturing.
The LM4041 product line was developed to deliver cost-optimized, micropower shunt references for space- and power-constrained applications - balancing performance, size, and manufacturability across industrial, automotive, and portable markets.
FAQ
What is the output voltage and tolerance of LM4041CILPR?
The LM4041CILPR provides a fixed 1.225 V nominal output voltage with a maximum initial tolerance of ±0.5% at 25°C (C grade). This tolerance holds across the full operating temperature range of –40°C to +85°C, and the device maintains ≤100 ppm/°C temperature coefficient to ensure predictable drift in industrial environments. LM4041CILPR does not require external components to achieve this specification.
Does LM4041CILPR require an output capacitor for stability?
No, LM4041CILPR is inherently stable with all capacitive loads and does not require an output capacitor between Cathode and Anode. Its design eliminates the need for external bypass capacitance, reducing bill-of-materials count and PCB area. If added, the capacitor will not degrade stability - a key advantage over many competing shunt references that mandate specific capacitor values or ESR ranges.
What is the minimum cathode current required for LM4041CILPR to regulate properly?
The LM4041CILPR requires a minimum cathode current of 45 μA (typical) at 25°C to maintain regulation, rising to 80 μA across the full –40°C to +85°C temperature range. This ultra-low current enables use in battery-powered systems where bias resistors can exceed 1 MΩ while still ensuring reliable startup and stable output voltage. LM4041CILPR remains functional up to 12 mA cathode current.
How is the NC pin (Pin 3) of LM4041CILPR used in practice?
Pin 3 of LM4041CILPR is a no-connect terminal and must either remain floating or be tied directly to the Anode (Pin 2) - TI explicitly recommends the latter in high-EMI environments such as proximity to switching power supplies or transformers. Connecting Pin 3 to Anode suppresses noise coupling through parasitic capacitance and improves immunity to fast transients without affecting regulation performance. Leaving it floating is acceptable in low-noise PCB layouts.
Can LM4041CILPR be used in automotive applications?
LM4041CILPR is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q200 qualified. While it may function in some under-hood or cabin applications, Texas Instruments does not guarantee automotive-grade reliability or qualification for LM4041CILPR. For automotive use, designers should select the LM4041Q variant (e.g., LM4041C12Q), which is characterized to –40°C to +125°C and meets automotive stress-test requirements. LM4041CILPR is intended for industrial and commercial systems only.
LM4041CILPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.233V
- Voltage - Output (Max):
- 10 V
- Current - Output:
- 12 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM4041CILPR FAQ
1.How can I place an order for LM4041CILPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041CILPR 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 LM4041CILPR reliable?
The price and inventory of LM4041CILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041CILPR is usually 5 days.
3.What payment methods are accepted for LM4041CILPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041CILPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041CILPR?
LM4041CILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041CILPR 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 LM4041CILPR?
For technical support, including LM4041CILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041CILPR requirements.
6.How does Aetrix verify that LM4041CILPR is sourced from the original manufacturer or authorized distributors?
All LM4041CILPR 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 LM4041CILPR meets industry standards.
7.What is the process for return or replacement of LM4041CILPR?
All LM4041CILPR units undergo pre-shipment inspection (PSI). If there is an issue with LM4041CILPR, 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 LM4041CILPR part is unused and in its original packaging.
Return procedure for LM4041CILPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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