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Texas Instruments LM4041CILP
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- Part No.:
- LM4041CILP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4041CILP.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,782
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Product details
Overview
LM4041CILP 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 reference in battery-powered instrumentation and power-supply monitoring circuits.
For engineers reviewing the LM4041CILP datasheet, LM4041CILP pinout, LM4041CILP application, or LM4041CILP equivalent, this page delivers verified specifications, package-confirmed terminal functions, industrial-temperature operating context (–40°C to +85°C), and validated alternative options for precision analog design.
Technical Context
The LM4041CILP operates as a two-terminal shunt reference, sinking cathode current to maintain a stable 1.225 V across its terminals. Its Zener-zap trimmed bandgap core achieves tight initial tolerance and low thermal drift without requiring external capacitors or bias resistors beyond the basic shunt configuration.
It features low dynamic impedance (≤1.5 Ω at 1 mA), minimal load regulation error (≤2 mV over 1 mA to 12 mA), and guaranteed stability with all capacitive loads - enabling direct integration into high-PSRR ADC reference paths and low-noise sensor signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V nominal; enables direct replacement of legacy 1.2 V references without resistor network recalculations. |
| Initial Tolerance | ±0.5% max at 25°C (C grade); ensures ≤6.1 mV absolute error in precision DAC/ADC biasing at room temperature. |
| Temp Coefficient | ≤100 ppm/°C max over –40°C to +85°C; contributes ≤12.2 mV drift across full industrial range. |
| Noise (10 Hz–10 kHz) | 20 μVRMS typical; supports 16-bit+ resolution in low-frequency measurement systems without added filtering. |
| Operating Current | 45 μA min to 12 mA max cathode current; allows use in ultra-low-power sensor nodes and high-current reference buffers. |
| Dynamic Impedance | ≤1.5 Ω at 1 mA (25°C); maintains <0.15% output variation under 1 mA load transients. |
| Long-Term Stability | 120 ppm after 1000 hours; predicts <0.15% output shift over 1 year in sealed industrial enclosures. |
Pinout & Package
LM4041CILP is packaged in a 3-pin SOT-23 (DBZ) surface-mount package with exposed pad (not electrically connected). Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is No Connect (must float or connect to Anode per TI recommendation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current sink / output node | Shunt current path; voltage referenced to Anode; connects to top of series resistor in standard shunt regulator topology. |
| Anode (Pin 2) | Reference ground / return path | Typically tied to system ground; forms the 1.225 V potential difference with Cathode; must be low-impedance for accuracy. |
| No Connect (Pin 3) | Unused terminal | Must remain unconnected or tied to Anode; floating Pin 3 prevents parasitic Schottky conduction in SOT-23 package. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with any capacitive load up to 10 µF; eliminates BOM cost and board space for bypass caps in portable designs. |
| Micropower operation | 45 µA minimum cathode current enables operation from coin cells or energy-harvesting sources with >10-year battery life. |
| Industrial temperature range | Specified from –40°C to +85°C; qualified for use in factory automation controllers and outdoor metering equipment. |
| Low noise performance | 20 µVRMS (10 Hz–10 kHz) supports high-resolution data acquisition without post-regulation filtering. |
| Trimmed Zener-zap process | Four precision grades (A/B/C/D) enable cost-optimized selection without redesigning reference circuitry. |
Applications
| Portable Data Loggers | Industrial Power-Supply Monitors |
|---|---|
|
Use Scenario: Battery-powered environmental sensors logging temperature, humidity, and pressure at 1-minute intervals for 5+ years. IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for 16-bit SAR ADC and microcontroller internal voltage monitor. Use Value: 45 µA minimum operating current extends CR2032 battery life beyond 7 years; ±0.5% tolerance ensures <±1 LSB error at full scale. |
Use Scenario: DIN-rail mounted PLC power module verifying 24 V DC rail integrity before enabling I/O drivers. IC Role / Device Role / Timing Role: Shunt reference in comparator-based overvoltage/undervoltage detection circuit with hysteresis. Use Value: 100 ppm/°C tempco guarantees trip-point stability across –40°C to +85°C ambient; no calibration needed during field deployment. |
| Precision Audio Level Meters | Smart Energy Meters |
|
Use Scenario: Analog front-end in professional audio analyzers measuring RMS signal levels from –80 dBu to +20 dBu. IC Role / Device Role / Timing Role: Reference for dual-slope integrator ADC converting AC-coupled audio envelope to digital display value. Use Value: 20 µVRMS noise floor enables accurate sub-millivolt measurements; stable output prevents zero-drift during long calibration cycles. |
Use Scenario: Revenue-grade electricity meter measuring active/reactive power via isolated current/voltage sensing. IC Role / Device Role / Timing Role: Primary voltage reference for metrology-grade 24-bit sigma-delta ADC sampling current transformers and potential dividers. Use Value: 120 ppm long-term stability meets IEC 62053-21 Class 0.2 accuracy requirements over 10-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CIPK | Adjustable 2.5 V reference; higher 100 µA min cathode current; 50 ppm/°C tempco; requires external resistors for 1.225 V setting. | Not drop-in: needs resistor divider redesign; unsuitable for space-constrained layouts where fixed 1.225 V is required. | Select when adjustable output or tighter tempco is prioritized over footprint and simplicity. |
| REF3012AIDBZR | Series reference; 1.2 V output; 0.2% initial tolerance; 50 ppm/°C; 50 µA quiescent current; requires input-to-output headroom. | Not pin-compatible: 3-pin SOT-23 but different topology (input/output/gnd vs cathode/anode/NC); incompatible with shunt configurations. | Select only if supply headroom ≥1.8 V exists and low-noise series topology is preferred over shunt architecture. |
Compared with TL431CIPK and REF3012AIDBZR, LM4041CILP offers true drop-in compatibility for fixed 1.225 V shunt references, minimal board area, and guaranteed stability without external components - making it optimal for retrofitting legacy 1.2 V designs and ultra-low-power edge sensors.
Availability
LM4041CILP is available at Aetrix Electronics and suitable for portable instrumentation, industrial power monitors, and smart energy meters requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4041CILP 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 voltage references and power management ICs.
The LM4041 product line delivers micropower, low-drift shunt references optimized for battery-operated test equipment, industrial sensors, and energy metering applications demanding high accuracy without external compensation.
FAQ
What is the maximum cathode current rating for LM4041CILP?
The absolute maximum continuous cathode current for LM4041CILP is 25 mA, but the recommended operating range is 45 μA to 12 mA. Operating above 12 mA increases self-heating and may degrade long-term stability and temperature coefficient performance. The LM4041CILP datasheet specifies 12 mA as the upper limit for guaranteed electrical characteristics across the full –40°C to +85°C temperature range.
Does LM4041CILP require an output capacitor for stability?
No, LM4041CILP does not require an output capacitor for stability. It is explicitly designed to remain stable with all capacitive loads - including 0 μF - due to its inherent low dynamic impedance and internal compensation. Adding a capacitor (e.g., 100 nF) may reduce high-frequency noise but is never necessary for loop stability in any application.
What is the function of Pin 3 on the LM4041CILP SOT-23 package?
Pin 3 of the LM4041CILP (SOT-23 DBZ package) is a no-connect (NC) terminal. Per Texas Instruments' datasheet, it must either be left floating or connected to the Anode (Pin 2) to prevent unintended conduction through the parasitic Schottky diode between Pins 2 and 3. Leaving Pin 3 unconnected without tying it to Anode risks forward-biasing this diode under EMI or transient conditions.
Can LM4041CILP be used in automotive applications?
LM4041CILP is rated for –40°C to +85°C operation and is not AEC-Q200 qualified. While it may function in under-hood environments with additional thermal derating, Texas Instruments does not specify or guarantee performance for automotive applications. For automotive use, the LM4041Q series (e.g., LM4041CQ) - qualified to –40°C to +125°C and meeting AEC-Q100 stress testing - is the appropriate variant.
How does the LM4041CILP differ from the adjustable LM4041BILP?
LM4041CILP is a fixed-output 1.225 V shunt reference with ±0.5% initial tolerance and 100 ppm/°C tempco. LM4041BILP is the adjustable version requiring external resistors to set outputs from 1.225 V to 10 V, with ±0.2% reference voltage tolerance and identical tempco. They share the same SOT-23 package and pinout, but LM4041BILP uses Pin 1 as FB (feedback) instead of NC, and its Anode and Cathode roles differ in circuit implementation.
LM4041CILP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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
LM4041CILP FAQ
1.How can I place an order for LM4041CILP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041CILP 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 LM4041CILP reliable?
The price and inventory of LM4041CILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041CILP is usually 5 days.
3.What payment methods are accepted for LM4041CILP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041CILP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041CILP?
LM4041CILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041CILP 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 LM4041CILP?
For technical support, including LM4041CILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041CILP requirements.
6.How does Aetrix verify that LM4041CILP is sourced from the original manufacturer or authorized distributors?
All LM4041CILP 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 LM4041CILP meets industry standards.
7.What is the process for return or replacement of LM4041CILP?
All LM4041CILP units undergo pre-shipment inspection (PSI). If there is an issue with LM4041CILP, 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 LM4041CILP part is unused and in its original packaging.
Return procedure for LM4041CILP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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