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Texas Instruments LM4040C10ILP
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- Part No.:
- LM4040C10ILP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040C10ILP.pdf
- Description:
- IC VREF SHUNT 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:978
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Product details
Overview
LM4040C10ILP from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 10V output with ±0.5% initial accuracy (C grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a low-drift, low-noise reference in high-resolution ADCs and sensor signal chains within industrial analog input modules.
For engineers reviewing the LM4040C10ILP datasheet, LM4040C10ILP pinout, LM4040C10ILP application, or LM4040C10ILP equivalent, key selection criteria include its guaranteed 10V output tolerance over –40°C to 85°C, no-output-capacitor-required stability, and SC-70 package compatibility with space-constrained portable and field-deployed instrumentation.
Technical Context
The LM4040C10ILP operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 10V reverse breakdown voltage (VZ) across its terminals. Its Zener-zap trimmed silicon design achieves tight initial tolerance without external components, and its low dynamic impedance (≤0.9Ω at 1mA) ensures minimal load regulation error under varying current conditions.
It functions across a wide cathode current range (45μA–15mA) while maintaining specified accuracy and noise performance, and requires no output capacitor-enabling direct integration into high-impedance feedback paths of op-amps and SAR ADC references without stability concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 10V nominal; maintains ±0.5% initial accuracy at 25°C for stable system-level calibration points |
| Initial Accuracy | ±0.5% max (C grade); enables single-point calibration in 12-bit to 14-bit data acquisition systems |
| Temp Coefficient | 100ppm/°C max; contributes ≤±0.65% drift over –40°C to 85°C ambient range |
| Output Noise | 35μVRMS (10Hz–10kHz); avoids quantization noise floor elevation in precision 16-bit+ ADCs |
| Cathode Current Range | 45μA to 15mA; supports ultra-low-power sensor biasing and high-current reference buffering |
| Dynamic Impedance | 0.9Ω max at 1mA; minimizes voltage shift during transient load changes in closed-loop circuits |
| Thermal Hysteresis | 0.08% max; ensures repeatable voltage after thermal cycling in field transmitters |
Pinout & Package
LM4040C10ILP is packaged in a 5-pin SC-70 (DCK) package measuring 2.00mm × 1.25mm. The device uses a three-terminal functional configuration despite five physical pins, with two NC (no-connect) pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current/voltage input | Connected to supply rail; sinks current to regulate voltage at anode node |
| Anode (Pin 1) | Common reference node | Typically grounded; forms the 0V reference point for regulated 10V output |
| NC (Pins 4, 5) | No internal connection | Must be left unconnected; no electrical function or thermal benefit |
| Pin * (Pin 2) | Optional shield tie | Floats by default; connect to anode only in high-EMI environments to reduce noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 10V output | Eliminates external resistor networks and trimming, reducing BOM count and layout area in precision references |
| Stable with all capacitive loads | Enables direct connection to ADC input capacitors or op-amp inputs without phase-margin compensation |
| 45μA minimum operating current | Supports battery-powered field transmitters and energy-harvesting nodes with sub-100μA system budgets |
| –40°C to 85°C operating range | Validated for use in industrial control cabinets and outdoor analog I/O modules without derating |
| Low 35μVRMS noise | Preserves effective number of bits (ENOB) in 16-bit SAR ADCs without requiring additional filtering |
Applications
| Industrial Analog Input Module | Data-Acquisition System |
|---|---|
Use Scenario: High-density PLC analog input card conditioning 0–10V sensor signals with 16-bit resolution. IC Role / Device Role / Timing Role: Provides stable 10V reference for ADC driver stage and gain-setting resistors. Use Value: Enables ±0.5% full-scale accuracy across temperature without recalibration, reducing factory test time. | Use Scenario: Portable battery-powered vibration analyzer sampling at 100kSPS with 16-bit ADC. IC Role / Device Role / Timing Role: Supplies low-noise 10V reference to SAR ADC's internal reference buffer. Use Value: 35μVRMS noise prevents ENOB degradation below 15.2 bits at 100kSPS, preserving dynamic range. |
| Field Transmitter | Energy Infrastructure Monitoring |
Use Scenario: Loop-powered 4–20mA transmitter with HART modulation, operating in outdoor enclosures. IC Role / Device Role / Timing Role: Serves as primary voltage reference for DAC-based current loop control and sensor excitation. Use Value: 100ppm/°C tempco and 0.08% thermal hysteresis ensure <±0.1% span drift over seasonal temperature cycles. | Use Scenario: Smart meter voltage monitoring channel measuring grid phase-to-phase voltages up to 400VAC. IC Role / Device Role / Timing Role: References isolated sigma-delta ADC measuring scaled-down AC waveforms. Use Value: Stable 10V output enables ±0.2% RMS voltage measurement accuracy compliant with IEC 62053-22 Class 0.5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C10IDBZR | Same 10V output, ±0.5% accuracy, but 75ppm/°C tempco and 20μVRMS noise; SC-70-3 package (3 pins, no NCs) | Better noise and tempco, but lacks optional shield pin; less suitable for EMI-prone field wiring environments | Select when lower noise and tighter tempco outweigh need for EMI mitigation pin |
| REF3010AIDBZR | 10V series reference; requires 50μA quiescent current + load current; 100ppm/°C tempco; 45μVRMS noise; SOT-23-3 | Higher output impedance and noise; needs external bypass cap; unsuitable for high-Z ADC reference inputs | Choose only if supply headroom allows series topology and PCB area permits decoupling capacitor |
Compared with TL4050C10IDBZR, LM4040C10ILP offers EMI resilience via its shield pin but trades 5μVRMS noise; versus REF3010AIDBZR, it delivers lower output impedance and zero-bypass operation critical for SAR ADC references, though limited to shunt topology constraints.
Availability
LM4040C10ILP is available at Aetrix Electronics and suitable for industrial analog input modules, field transmitters, portable data-acquisition systems, and energy infrastructure monitoring requiring stable component supply and long-term calibration integrity.
Supply support for LM4040C10ILP 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 leadership in precision reference design.
The LM4040 family was engineered for cost-sensitive, space-constrained applications demanding micropower operation, low noise, and robust thermal performance-particularly in industrial sensing, process control, and portable instrumentation.
FAQ
What is the operating temperature range for LM4040C10ILP?
The LM4040C10ILP is characterized for operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per TI's LM4040xI specification and supports deployment in control cabinets, outdoor transmitters, and factory-floor data loggers without thermal derating.
Does LM4040C10ILP require an output capacitor for stability?
No, LM4040C10ILP is inherently stable with all capacitive loads and does not require an output capacitor. Its design eliminates the need for external bypassing, simplifying layout in high-impedance reference paths such as those feeding SAR ADC voltage references or op-amp gain networks.
What is the minimum cathode current needed for LM4040C10ILP to regulate properly?
The LM4040C10ILP requires a minimum cathode current of 45μA (typical) to maintain regulation within specifications. At 25°C, regulation is guaranteed down to 75μA; over the full –40°C to 85°C range, the minimum is 80μA per electrical characteristics table 6.22.
How does the NC pin configuration affect LM4040C10ILP PCB layout?
Pins 4 and 5 of LM4040C10ILP are NC (no internal connection) and must remain unconnected on the PCB. They serve no electrical or thermal function-neither grounding nor routing to them improves performance. Leaving them floating avoids unintended parasitic coupling in sensitive analog sections.
Can LM4040C10ILP be used in automotive applications?
LM4040C10ILP is not qualified for automotive AEC-Q100 applications. It is rated for industrial temperature range (–40°C to 85°C) only. For automotive use, TI recommends the LM4040-Q1 variant (e.g., LM4040C10QDBZRQ1), which undergoes full AEC-Q100 stress testing and supports extended temperature operation to 125°C.
LM4040C10ILP 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:
- Fixed
- Voltage - Output (Min/Fixed):
- 10V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 180µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 125 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM4040C10ILP FAQ
1.How can I place an order for LM4040C10ILP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C10ILP 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 LM4040C10ILP reliable?
The price and inventory of LM4040C10ILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C10ILP is usually 5 days.
3.What payment methods are accepted for LM4040C10ILP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C10ILP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C10ILP?
LM4040C10ILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C10ILP 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 LM4040C10ILP?
For technical support, including LM4040C10ILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C10ILP requirements.
6.How does Aetrix verify that LM4040C10ILP is sourced from the original manufacturer or authorized distributors?
All LM4040C10ILP 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 LM4040C10ILP meets industry standards.
7.What is the process for return or replacement of LM4040C10ILP?
All LM4040C10ILP units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C10ILP, 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 LM4040C10ILP part is unused and in its original packaging.
Return procedure for LM4040C10ILP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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