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Texas Instruments LM4040C25ILP
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- Part No.:
- LM4040C25ILP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040C25ILP.pdf
- Description:
- IC VREF SHUNT 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,968
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Product details
Overview
LM4040C25ILP from Texas Instruments is a precision 2.5V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 85°C operation, with ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a compact, low-power reference in analog-to-digital converters and sensor signal conditioning circuits.
For engineers reviewing the LM4040C25ILP datasheet, LM4040C25ILP pinout, LM4040C25ILP application, or LM4040C25ILP equivalent, key selection criteria include output tolerance over temperature, minimum operating current, dynamic impedance at 1mA, thermal hysteresis, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040C25ILP uses Zener-zap trimming during wafer sort to achieve its 0.5% initial accuracy, and maintains stability across its full operating current range (45μA–15mA) via low dynamic impedance (0.9Ω typical at 1mA) and inherent capacitance tolerance. Its two-terminal architecture eliminates need for output capacitors while supporting high-precision feedback paths.
Designed for industrial ambient conditions, the device features a fixed 2.5V reverse breakdown voltage with guaranteed performance across –40°C to +85°C, leveraging a temperature-compensated Zener core that delivers consistent 100ppm/°C drift and <0.08% thermal hysteresis after cycling between extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal reverse breakdown voltage at 100μA cathode current - sets precise bias point for ADC references and analog front-ends. |
| Initial Accuracy | ±0.5% at 25°C - enables direct use in 12-bit systems without calibration. |
| Temp Coefficient | 100ppm/°C max over –40°C to +85°C - ensures ≤±0.125V drift across full industrial range. |
| Noise (10Hz–10kHz) | 35μVRMS typical - minimizes quantization error in high-resolution data acquisition. |
| Min Cathode Current | 45μA typical - supports ultra-low-power battery-operated sensors and IoT nodes. |
| Dynamic Impedance | 0.9Ω typical at 1mA - maintains regulation under fast load transients in closed-loop systems. |
| Thermal Hysteresis | 0.08% - guarantees repeatable voltage after thermal cycling, critical for field-deployed instrumentation. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current/voltage input | Connects to regulated node; sinks current to maintain 2.5V reference potential. |
| Anode (Pin 2) | Common ground reference | Must be tied to system ground; forms return path for cathode current. |
| NC (Pin 3) | No internal connection | Float or tie to anode per TI recommendation in high-noise environments. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - reduces BOM count and layout sensitivity in portable designs. |
| Low micropower operation | 45μA typical minimum cathode current enables >10-year battery life in wireless sensor nodes. |
| Wide operating current range | 45μA to 15mA operation allows single part to serve both ultra-low-power and higher-current analog stages. |
| Low output noise | 35μVRMS (10Hz–10kHz) supports 16-bit+ resolution without external filtering. |
| Extended temperature grade | Specified from –40°C to +85°C - qualified for industrial control, energy metering, and automotive cabin modules. |
Applications
| Industrial Data Acquisition | Energy Metering |
|---|---|
Use Scenario: High-accuracy voltage scaling for 24-bit sigma-delta ADCs in programmable logic controllers. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5V reference for ADC VREF input and sensor excitation. Use Value: ±0.5% initial accuracy and 100ppm/°C drift ensure <0.01% total error over temperature without recalibration. |
Use Scenario: Precision voltage reference for polyphase electricity meters measuring active/reactive power. IC Role / Device Role / Timing Role: Reference source for metrology-grade ADCs sampling current/voltage waveforms simultaneously. Use Value: 35μVRMS noise prevents LSB dithering in 0.1% class metering ICs; stable under varying line-load conditions. |
| Field Transmitter Signal Conditioning | Automotive Cabin Sensors |
Use Scenario: 4–20mA loop-powered transmitter with integrated temperature/pressure sensing. IC Role / Device Role / Timing Role: Two-terminal shunt reference generating stable bias for op-amp signal chains and DAC outputs. Use Value: 45μA min current enables operation at lowest loop currents; SOT-23 package fits tight 4–20mA module footprints. |
Use Scenario: Cabin air quality and humidity sensors in HVAC control modules. IC Role / Device Role / Timing Role: Reference for low-power analog front-end amplifying resistive/capacitive sensor elements. Use Value: –40°C to +85°C rating ensures reliability across vehicle lifecycle; low noise preserves signal integrity in noisy automotive EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C25IDBZR | Same electrical specs, tape-and-reel packaging (3000 pcs), identical DBZ package and pinout. | No functional difference; optimized for automated SMT assembly vs. cut-tape. | Select LM4040C25IDBZR for high-volume production; LM4040C25ILP is same device in cut-tape format. |
| MAX6008BCR25+T | 2.5V shunt reference, ±0.5% accuracy, but higher 75ppm/°C tempco and 60μVRMS noise. | Lower noise and tighter tempco of LM4040C25ILP preferred for metrology; MAX6008 suits cost-sensitive industrial controls. | Choose LM4040C25ILP where long-term stability and low noise are critical; MAX6008 offers smaller SC70-5 package if board space is constrained. |
Compared with LM4040C25IDBZR, LM4040C25ILP offers identical performance in cut-tape form factor for prototyping and low-volume builds; versus MAX6008BCR25+T, LM4040C25ILP delivers 25μVRMS lower noise and 25ppm/°C better temperature coefficient-directly improving measurement repeatability in precision analog systems.
Availability
LM4040C25ILP is available at Aetrix Electronics and suitable for industrial data acquisition, energy metering, and field transmitter applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM4040C25ILP 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 manufacturing.
The LM4040 series was developed to deliver high-accuracy, low-power shunt references for industrial, energy, and automotive applications where size, stability, and reliability are critical.
FAQ
What is the maximum operating temperature for LM4040C25ILP?
The LM4040C25ILP is characterized for operation from –40°C to +85°C ambient temperature. Its electrical specifications-including 2.5V output, ±0.5% accuracy, and 100ppm/°C temperature coefficient-are guaranteed across this full industrial temperature range, making it suitable for harsh-environment deployments where thermal stability is essential.
Does LM4040C25ILP require an output capacitor?
No, LM4040C25ILP is inherently stable with all capacitive loads and does not require an external output capacitor. This simplifies design, reduces component count, and avoids potential instability issues associated with capacitor ESR and layout parasitics-especially beneficial in compact, battery-powered systems.
What is the minimum cathode current needed for LM4040C25ILP regulation?
The LM4040C25ILP requires a minimum cathode current of 45μA (typical) to maintain regulation. At this current, it delivers its specified 2.5V output with full accuracy and noise performance. Operating below this threshold may result in loss of regulation and increased output drift.
How does the LM4040C25ILP compare to the A-grade version (LM4040A25ILP)?
The LM4040C25ILP has ±0.5% initial accuracy and 100ppm/°C temperature coefficient, whereas LM4040A25ILP offers tighter ±0.1% accuracy and same 100ppm/°C drift. The C-grade provides optimal cost-performance balance for 12-bit systems, while the A-grade targets 14–16-bit metrology applications demanding highest precision.
Is LM4040C25ILP compatible with SOT-23-3 PCB footprints from other manufacturers?
Yes, LM4040C25ILP uses the industry-standard SOT-23-3 (DBZ) package with 2.92mm × 1.30mm dimensions and JEDEC-compliant pinout (Cathode–Anode–NC). It is mechanically and electrically compatible with standard SOT-23-3 land patterns, enabling drop-in replacement in existing layouts designed for similar shunt references.
LM4040C25ILP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- 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
LM4040C25ILP FAQ
1.How can I place an order for LM4040C25ILP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C25ILP 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 LM4040C25ILP reliable?
The price and inventory of LM4040C25ILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25ILP is usually 5 days.
3.What payment methods are accepted for LM4040C25ILP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C25ILP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C25ILP?
LM4040C25ILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C25ILP 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 LM4040C25ILP?
For technical support, including LM4040C25ILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25ILP requirements.
6.How does Aetrix verify that LM4040C25ILP is sourced from the original manufacturer or authorized distributors?
All LM4040C25ILP 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 LM4040C25ILP meets industry standards.
7.What is the process for return or replacement of LM4040C25ILP?
All LM4040C25ILP units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25ILP, 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 LM4040C25ILP part is unused and in its original packaging.
Return procedure for LM4040C25ILP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C25ILP Tags
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