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Texas Instruments LM4040C30ILP
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- Part No.:
- LM4040C30ILP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040C30ILP.pdf
- Description:
- IC VREF SHUNT 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,954
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Product details
Overview
LM4040C30ILP from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 3.0V output with ±0.5% initial accuracy (25°C), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current - used in analog input modules and field transmitters requiring high stability under varying load and temperature.
For engineers reviewing the LM4040C30ILP datasheet, LM4040C30ILP pinout, LM4040C30ILP application, or LM4040C30ILP equivalent, this page provides verified electrical specifications, package mapping to SOT-23-3 (DBZ), thermal performance data, and validated alternative parts for industrial-grade voltage reference design.
Technical Context
The LM4040C30ILP operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 3.0V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon die achieves 0.5% tolerance at 25°C and maintains ≤100ppm/°C drift over –40°C to +85°C.
It requires no external capacitor, exhibits low dynamic impedance (0.4–0.9Ω at 1mA), and delivers stable regulation even with capacitive loads up to 10nF - enabling direct use in ADC reference buffers and sensor signal conditioning circuits without compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V nominal at IZ = 100μA; tight regulation enables accurate 12-bit+ ADC reference scaling |
| Initial Accuracy | ±0.5% at 25°C; supports calibration-free designs in industrial analog front-ends |
| Temp Coefficient | 100ppm/°C max over –40°C to +85°C; ensures <±0.26% total drift across full operating range |
| Noise (10Hz–10kHz) | 35μVRMS typical; low enough to avoid degrading 16-bit SAR ADC effective resolution |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered sensor nodes |
| Dynamic Impedance | 0.4Ω (typ) at 1mA; minimizes output voltage shift during transient load changes |
| Long-Term Stability | 120ppm after 1000 hours; supports 10+ year system reliability in energy infrastructure |
Pinout & Package
LM4040C30ILP is packaged in a 3-pin SOT-23 (DBZ) case measuring 2.92mm × 1.30mm, optimized for space-constrained PCB layouts in portable and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current/voltage input | Connected to regulated supply rail; sinks current to maintain 3.0V drop across device |
| Anode (Pin 2) | Common ground reference | Typically tied to system ground; forms return path for cathode current |
| NC (Pin 3) | No internal connection | Must be left floating or connected to anode per EMI mitigation guidance in TI datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.0V output | Eliminates external resistor divider; reduces BOM count and layout sensitivity in precision references |
| Stable with all capacitive loads | Enables direct connection to ADC reference inputs or op-amp feedback nodes without stability analysis |
| Wide operating current range | Supports both ultra-low-power (45μA) and high-accuracy (10mA) configurations in same design |
| Low temperature hysteresis | 0.08% thermal hysteresis ensures repeatable voltage after thermal cycling in field-deployed equipment |
| Extended temperature grade | Rated for –40°C to +85°C ambient; qualified for industrial automation and energy metering applications |
Applications
| Analog Input Module | Field Transmitter |
|---|---|
Use Scenario: Precision 4–20mA loop-powered sensor interface with 16-bit ADC digitization. IC Role / Device Role / Timing Role: Provides stable 3.0V reference for ADC and DAC circuitry, rejecting supply ripple and thermal drift. Use Value: Enables ±0.01% measurement accuracy over temperature without recalibration, meeting IEC 61000-4 compliance. |
Use Scenario: Two-wire smart pressure/temperature transmitter operating from 12–42V loop supply. IC Role / Device Role / Timing Role: Supplies regulated 3.0V bias to signal conditioning amplifiers and microcontroller peripherals. Use Value: Maintains reference stability despite >30V supply variation and 85°C ambient, ensuring HART protocol compatibility. |
| Data-Acquisition System | Energy Infrastructure |
Use Scenario: Modular DAQ card with multiple simultaneous-sampling channels and programmable gain. IC Role / Device Role / Timing Role: Serves as master reference for multi-channel SAR ADCs and PGA offset trimming. Use Value: Low 35μVRMS noise preserves ENOB >15.2 bits; 100ppm/°C TC avoids channel-to-channel gain mismatch. |
Use Scenario: Revenue-grade electricity meter with metrology ASIC and anti-tampering monitoring. IC Role / Device Role / Timing Role: Supplies precision reference to metrology ADC and real-time clock backup circuitry. Use Value: 120ppm long-term stability meets ANSI C12.20 Class 0.2 accuracy requirements over 15-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 |
|---|---|---|---|
| LM4040C30IDBZR | Same electrical specs; SOT-23-3 tape-and-reel packaging (vs. cut-tape in LP variant) | Identical performance; preferred for automated SMT assembly | Select LM4040C30IDBZR for volume production with pick-and-place machines |
| REF3030AIDBZR | 3.0V series reference; 50ppm/°C TC, 25μVRMS noise, but requires ≥50μA quiescent current and external bypass cap | Better noise/TC but higher power and layout complexity; not drop-in compatible | Choose REF3030AIDBZR only when lower noise and tighter TC justify added design overhead |
Compared with LM4040C30ILP, LM4040C30IDBZR offers identical performance in machine-ready packaging, while REF3030AIDBZR trades shunt simplicity for improved noise and TC at the cost of mandatory external capacitance and higher minimum supply current.
Availability
LM4040C30ILP is available at Aetrix Electronics and suitable for analog input modules, field transmitters, and data-acquisition systems requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040C30ILP 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 industrial-grade ICs.
The LM4040 family was designed specifically for cost-sensitive, space-constrained applications demanding high accuracy, low power, and robust thermal performance - targeting industrial sensing, energy metering, and portable instrumentation.
FAQ
What is the maximum cathode current rating for LM4040C30ILP?
The absolute maximum cathode current for LM4040C30ILP is 25mA, but the recommended operating range is 45μA to 15mA. Operating above 15mA increases self-heating and may degrade long-term stability; TI specifies 15mA as the upper limit for guaranteed parametric performance across temperature.
Does LM4040C30ILP require an output capacitor for stability?
No, LM4040C30ILP is inherently stable with all capacitive loads and does not require an external output capacitor. This is confirmed in the TI datasheet Section 3 and eliminates risk of oscillation or phase-margin issues common with series references - simplifying layout in compact analog designs.
What is the thermal hysteresis specification for LM4040C30ILP?
LM4040C30ILP has a thermal hysteresis of 0.08%, defined as the voltage difference measured at 25°C after cycling between –40°C and +125°C. This low hysteresis ensures repeatable reference accuracy in equipment subjected to repeated thermal stress, such as outdoor energy monitors.
Can LM4040C30ILP be used in automotive applications?
LM4040C30ILP is rated for –40°C to +85°C and is not AEC-Q200 qualified. For automotive applications, TI recommends the LM4040C30Q variant (–40°C to +125°C, same electrical specs), which undergoes extended qualification testing and is listed in TI's automotive product portfolio.
How does the 100ppm/°C temperature coefficient translate to actual voltage drift over temperature?
With a 3.0V nominal output and 100ppm/°C coefficient, LM4040C30ILP drifts by ±0.3mV/°C. Over the full –40°C to +85°C range (ΔT = 125°C), total drift is ±37.5mV (±1.25%), consistent with the datasheet's overtemperature tolerance of ±1.15% for C-grade devices.
LM4040C30ILP 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):
- 3V
- 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:
- 82 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM4040C30ILP FAQ
1.How can I place an order for LM4040C30ILP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C30ILP 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 LM4040C30ILP reliable?
The price and inventory of LM4040C30ILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C30ILP is usually 5 days.
3.What payment methods are accepted for LM4040C30ILP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C30ILP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C30ILP?
LM4040C30ILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C30ILP 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 LM4040C30ILP?
For technical support, including LM4040C30ILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C30ILP requirements.
6.How does Aetrix verify that LM4040C30ILP is sourced from the original manufacturer or authorized distributors?
All LM4040C30ILP 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 LM4040C30ILP meets industry standards.
7.What is the process for return or replacement of LM4040C30ILP?
All LM4040C30ILP units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C30ILP, 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 LM4040C30ILP part is unused and in its original packaging.
Return procedure for LM4040C30ILP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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