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Texas Instruments LM4041DILP
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- Part No.:
- LM4041DILP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4041DILP.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,965
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Product details
Overview
LM4041DILP from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225V output, ±1.0% initial tolerance (D grade), 150ppm/°C max temperature coefficient, 20μVRMS typical noise, and stable operation from 45μA to 12mA cathode current. It serves as a compact, capacitor-free voltage reference in low-power analog signal chains and battery-powered instrumentation.
For engineers reviewing the LM4041DILP datasheet, LM4041DILP pinout, LM4041DILP application, or LM4041DILP equivalent, this page delivers verified electrical specs, TO-92 package terminal mapping, real-world use cases in power-supply monitoring and data acquisition, and two validated alternative parts for cost or performance trade-offs.
Technical Context
The LM4041DILP operates as a two-terminal shunt reference: cathode sinks current while anode connects to system ground, enabling simple biasing in series with a current-setting resistor. Its Zener-zap trimmed reverse breakdown voltage ensures tight initial accuracy without external trimming components.
It features low dynamic impedance (≤2Ω at 1mA), wide operating current range (45μA–12mA), and inherent stability with all capacitive loads - eliminating need for output bypass capacitors. The device is characterized over –40°C to +85°C and supports both fixed-output and adjustable configurations via feedback pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225V nominal; enables direct replacement of legacy 1.2V references in ADC/DAC bias networks. |
| Initial Tolerance | ±1.0% max at 25°C (D grade); defines worst-case DC offset in precision sensor front-ends. |
| Temp Coefficient | 150ppm/°C max over –40°C to +85°C; contributes ≤0.125% output drift across full industrial range. |
| Noise (10Hz–10kHz) | 20μVRMS typical; supports <16-bit resolution in low-frequency measurement systems. |
| Min Cathode Current | 45μA typical; allows operation in ultra-low-power wake-up circuits with microamp-level supply budgets. |
| Dynamic Impedance | ≤2Ω at 1mA; maintains regulation under fast load transients in switching power-supply feedback paths. |
| ESD Rating (HBM) | ±2000V; meets IEC 61000-4-2 Level 2 for board-level robustness in industrial environments. |
Pinout & Package
LM4041DILP is supplied in the through-hole TO-92 package (LP variant), with 3 leads and JEDEC-standard pinout: Pin 1 = NC (no connect), Pin 2 = Cathode (output/shunt node), Pin 3 = Anode (ground reference). The NC pin must float or be tied to anode per TI design guidance for EMI immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No Connect (NC) | Must remain unconnected or tied to anode to suppress high-frequency noise coupling; not internally connected. |
| Pin 2 | Cathode | Main output terminal; sinks total current (load + reference bias); connects to regulated voltage node. |
| Pin 3 | Anode | Ground reference terminal; ties directly to system ground plane for stable reference potential. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably with any capacitive load (0–∞), removing BOM cost and layout risk of output capacitor selection. |
| Micropower operation | 45μA typical minimum cathode current enables use in energy-harvesting and coin-cell applications. |
| Low-noise reference | 20μVRMS broadband noise supports high-resolution SAR and delta-sigma ADCs without external filtering. |
| Wide current range | Supports 45μA–12mA cathode current, allowing single-part reuse across low-power standby and high-accuracy active modes. |
| Grade-selectable accuracy | D-grade (±1.0%) offers lowest-cost option for non-critical biasing; A/B/C grades available for tighter requirements. |
Applications
| Power-Supply Monitor | Data-Acquisition System |
|---|---|
Use Scenario: Monitoring 3.3V or 5V rail voltage in embedded controllers using a comparator or ADC input. IC Role / Device Role / Timing Role: Provides stable 1.225V threshold reference for overvoltage/undervoltage detection. Use Value: Enables rail monitoring with ±1.0% trip-point accuracy across –40°C to +85°C without calibration. |
Use Scenario: Biasing the reference input of a 12-bit SAR ADC in portable test equipment. IC Role / Device Role / Timing Role: Serves as precision voltage reference for analog-to-digital conversion. Use Value: Delivers 20μVRMS noise floor and 150ppm/°C drift, supporting <1 LSB error across temperature. |
| Process Control Sensor Node | Battery-Powered Equipment |
Use Scenario: Providing excitation and reference for 4–20mA loop transmitter with RTD or strain-gauge input. IC Role / Device Role / Timing Role: Supplies stable bias to instrumentation amplifier and ADC reference path. Use Value: Maintains 1.225V output within ±1.0% over 10-year field life (120ppm long-term drift). |
Use Scenario: Regulating reference voltage in Bluetooth LE sensor tags powered by CR2032 cells. IC Role / Device Role / Timing Role: Shunt reference operating at 60μA quiescent current in sleep mode. Use Value: Draws only 45μA min cathode current, extending battery life beyond 5 years in periodic sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACLPR | Adjustable 2.5V–36V output; 2% initial tolerance; higher 0.22Ω dynamic impedance. | Requires external resistors for 1.225V setting; less suitable for space-constrained PCBs. | Select when adjustable output or higher voltage capability is needed; avoid if fixed 1.225V and minimal footprint are critical. |
| REF3012AIDBZR | Series reference; 1.2V output; ±0.2% tolerance; 3.3V min supply; 35μA quiescent current. | Requires dedicated supply rail; incompatible with shunt-based topologies like current-source biasing. | Choose for ultra-low-drift (50ppm/°C) and lower noise (12μVRMS) where series topology fits the power architecture. |
Compared with TL431ACLPR and REF3012AIDBZR, the LM4041DILP uniquely combines fixed 1.225V output, TO-92 through-hole compatibility, sub-50μA start-up current, and zero-output-capacitor operation - making it optimal for retrofitting legacy designs and ultra-low-power shunt regulator implementations.
Availability
LM4041DILP is available at Aetrix Electronics and suitable for power-supply monitors, data-acquisition systems, and battery-powered equipment requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LM4041DILP 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog ICs and broad distribution infrastructure.
The LM4041 series was designed specifically for cost-sensitive, space-constrained applications demanding micropower shunt references with guaranteed stability and low noise - targeting instrumentation, industrial sensing, and portable electronics.
FAQ
What is the maximum cathode current rating for LM4041DILP?
The LM4041DILP has a continuous cathode current rating of –10mA to +25mA, with recommended operation up to 12mA. Exceeding 12mA may increase thermal drift and reduce long-term stability; the device's 2Ω dynamic impedance ensures regulation remains effective within this range. Always verify power dissipation (VZ × IZ) stays below 150mW for reliable TO-92 operation.
Does LM4041DILP require an output capacitor for stability?
No, LM4041DILP does not require an output capacitor and is explicitly designed to remain stable with all capacitive loads - including 0μF. This eliminates capacitor-related BOM cost, layout area, and aging concerns. If added for noise filtering, any value (e.g., 100nF ceramic) is acceptable per TI's characterization data.
What is the function of Pin 1 (NC) on LM4041DILP in the TO-92 package?
Pin 1 on LM4041DILP is a no-connect terminal with no internal connection. TI recommends leaving it floating or tying it directly to Pin 3 (Anode) to reduce susceptibility to electromagnetic interference - especially when placed near transformers or high-frequency switchers. Connecting to anode provides a low-impedance path for noise currents without affecting regulation.
How does the temperature coefficient of LM4041DILP impact accuracy over –40°C to +85°C?
LM4041DILP has a maximum temperature coefficient of 150ppm/°C. Over the full –40°C to +85°C range (125°C span), this contributes up to ±0.01875V (±1.53%) additional error beyond initial ±1.0% tolerance. In practice, typical units show <100ppm/°C drift, limiting total error to <±2.2% - sufficient for 10-bit systems and non-critical biasing.
Can LM4041DILP be used in adjustable-output configurations?
No, LM4041DILP is the fixed-output variant (1.225V) and lacks the FB (feedback) pin required for adjustable operation. Only LM4041xI or LM4041xQ part numbers with "I" or "Q" suffixes include the feedback pin and support resistor-divider programming from 1.225V to 10V. Using LM4041DILP in adjustable mode is electrically invalid and unsupported.
LM4041DILP 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°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
LM4041DILP FAQ
1.How can I place an order for LM4041DILP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041DILP 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 LM4041DILP reliable?
The price and inventory of LM4041DILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041DILP is usually 5 days.
3.What payment methods are accepted for LM4041DILP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041DILP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041DILP?
LM4041DILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041DILP 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 LM4041DILP?
For technical support, including LM4041DILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041DILP requirements.
6.How does Aetrix verify that LM4041DILP is sourced from the original manufacturer or authorized distributors?
All LM4041DILP 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 LM4041DILP meets industry standards.
7.What is the process for return or replacement of LM4041DILP?
All LM4041DILP units undergo pre-shipment inspection (PSI). If there is an issue with LM4041DILP, 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 LM4041DILP part is unused and in its original packaging.
Return procedure for LM4041DILP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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