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Texas Instruments LM4040C20ILPR
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- Part No.:
- LM4040C20ILPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LM4040C20ILPR.pdf
- Description:
- IC VREF SHUNT 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,387
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Product details
Overview
LM4040C20ILPR from Texas Instruments is a precision micropower shunt voltage reference with 2.048V nominal output, ±10mV (±0.5%) initial tolerance at 25°C, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current - used in high-accuracy analog input modules and data-acquisition systems requiring low-drift, low-noise references.
For engineers reviewing the LM4040C20ILPR datasheet, LM4040C20ILPR pinout, LM4040C20ILPR application, or LM4040C20ILPR equivalent, key selection criteria include industrial-temperature operation (–40°C to +85°C), SOT-23-3 package compatibility, cathode current range, reverse dynamic impedance (<0.9Ω), and thermal hysteresis (0.08%).
Technical Context
The LM4040C20ILPR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.048V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves 0.5% initial accuracy and 100ppm/°C drift over –40°C to +85°C without external capacitors.
It delivers low dynamic impedance (0.3–0.9Ω), low noise (35μVRMS, 10Hz–10kHz), and long-term stability (120ppm after 1000h), enabling use in battery-powered instrumentation where supply headroom and power efficiency are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; enables exact 12-bit DAC/ADC full-scale alignment (e.g., 2.048V = 1 LSB × 2¹²) |
| Initial Tolerance | ±10mV (±0.5%) at 25°C; defines worst-case offset error before temperature or aging effects |
| Temp Coefficient | 100ppm/°C max; contributes ≤±6.5mV error over –40°C to +85°C ambient range |
| Cathode Current Range | 45μA to 15mA; supports ultra-low-power sensor biasing and higher-current precision regulators |
| Dynamic Impedance | 0.3–0.9Ω at 1mA; ensures minimal output voltage shift under load transients |
| Wideband Noise | 35μVRMS (10Hz–10kHz); critical for high-resolution measurement front-ends |
| Thermal Hysteresis | 0.08% (≈1.64mV); limits repeatability error after thermal cycling |
Pinout & Package
SOT-23-3 (DBZ) package: compact 2.92mm × 1.30mm footprint, surface-mount, thermally efficient, compatible with standard pick-and-place assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current/voltage input | Current sink node; connects to regulated rail via series resistor; voltage develops across this terminal relative to anode |
| Anode (Pin 2) | Common reference ground | Typically tied to system ground; establishes return path for cathode current and reference potential |
| NC (Pin 3) | No internal connection | Unbonded die pad; must be left floating or connected to anode per EMI mitigation guidance |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably with any capacitive load - eliminates need for output bypass capacitor and associated board area |
| Micropower operation | 45μA minimum cathode current enables use in 10-year battery-powered field transmitters |
| Extended temperature grade | Specified from –40°C to +85°C (I-grade), supporting industrial and automotive under-hood environments |
| Low thermal hysteresis | 0.08% hysteresis ensures repeatable voltage after thermal cycling - essential for calibration-critical test equipment |
| Zener-zap trimming | Fuse-based wafer-level voltage trim delivers consistent 0.5% accuracy without post-package adjustment |
Applications
| Analog Input Module | Data-Acquisition System |
|---|---|
Use Scenario: High-channel-count PLC analog input card measuring 4–20mA sensor signals with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.048V full-scale reference for ADC and signal-conditioning op-amps. Use Value: Enables ±0.5 LSB total unadjusted error budget by contributing only ±0.5% initial error and <±0.01% temp-induced drift over operating range. | Use Scenario: Portable handheld multimeter with autoranging, true RMS conversion, and battery operation. IC Role / Device Role / Timing Role: Precision voltage reference for dual-slope integrator and auto-zero amplifier stages. Use Value: 35μVRMS noise and 45μA min current allow >7½-digit resolution while extending battery life beyond 200 hours. |
| Field Transmitter | Energy Infrastructure Monitoring |
Use Scenario: Loop-powered 4–20mA temperature transmitter housed in IP67 enclosure with –40°C to +70°C ambient range. IC Role / Device Role / Timing Role: Primary voltage reference for RTD excitation and ADC reference in isolated signal chain. Use Value: 100ppm/°C TC and 0.08% thermal hysteresis ensure <±0.1°C measurement drift across full temperature cycle without recalibration. | Use Scenario: Smart electricity meter with metrology-grade AFE sampling voltage/current waveforms at 8kHz. IC Role / Device Role / Timing Role: Stable reference for anti-aliasing filter biasing and ADC reference in Class 0.2 metering IC. Use Value: Low dynamic impedance (0.9Ω max) prevents gain error shift during fast current transients, maintaining active energy accuracy within ±0.2%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C20IDBZR | Same 2.048V output, ±0.5% tolerance, but 50ppm/°C TC (vs. 100ppm/°C); 20μA min cathode current | Better TC suits tighter drift budgets; lower IZ,min improves ultra-low-power designs | Select when <50ppm/°C TC or sub-45μA operation is required; same SOT-23-3 footprint |
| REF3020AIDBZR | 2.048V, ±0.2% initial accuracy, 50ppm/°C TC, but series topology (3-pin); requires input voltage ≥ VOUT + 100mV | Higher accuracy and lower noise (25μVRMS), but needs headroom and external bypass cap | Choose for highest accuracy where supply margin allows; not drop-in due to topology and pin count difference |
Compared with TL4050C20IDBZR, LM4040C20ILPR offers higher temperature coefficient but broader cathode current range; compared with REF3020AIDBZR, it avoids input headroom requirements and external capacitance, simplifying layout in space-constrained industrial sensors.
Availability
LM4040C20ILPR is available at Aetrix Electronics and suitable for analog input modules, data-acquisition systems, and field transmitters requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for LM4040C20ILPR 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM4040 series targets precision analog systems needing low-cost, low-power, high-stability shunt references - optimized for portable instrumentation, process control, and energy metering where board space and quiescent current are critical.
FAQ
What is the operating temperature range for LM4040C20ILPR?
The LM4040C20ILPR is specified for industrial temperature operation from –40°C to +85°C. This range is confirmed in Section 6.6 of the TI datasheet (SLOS456Q) under "LM4040C20I Electrical Characteristics" and applies to the 'I' suffix variant. It does not support the extended –40°C to +125°C range offered by 'Q' grade variants like LM4040C20Q.
Does LM4040C20ILPR require an output capacitor?
No, LM4040C20ILPR is stable with all capacitive loads and requires no output capacitor. The device's inherent low dynamic impedance and internal compensation eliminate the need for external stabilization, reducing BOM count and PCB area - a key advantage over many series references.
What is the minimum cathode current needed for LM4040C20ILPR to regulate properly?
The LM4040C20ILPR requires a minimum cathode current of 45μA (typical) at 25°C to maintain regulation, rising to 80μA across the full –40°C to +85°C range. This value is explicitly listed in Table 6.6 of the TI datasheet and defines the lowest usable bias current for reliable 2.048V output.
How does the pin configuration of LM4040C20ILPR differ from LM4040xQ variants?
LM4040C20ILPR uses the SOT-23-3 (DBZ) package with Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC. LM4040xQ variants may use SC-70-5 or TO-92 packages with different pinouts; the 'I' and 'Q' suffixes denote temperature grade only - package and pinout are determined by the package code (e.g., 'LPR' = SOT-23-3), not the temperature suffix.
Can LM4040C20ILPR be used in place of LM4040A20ILPR?
Yes, LM4040C20ILPR can replace LM4040A20ILPR in applications tolerant of ±0.5% initial accuracy (vs. ±0.1%), provided the higher temperature coefficient (100ppm/°C vs. 100ppm/°C - same spec) and slightly higher dynamic impedance (0.9Ω max vs. 0.8Ω max) are acceptable. Both share identical pinout, package, and operating conditions.
LM4040C20ILPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- 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
LM4040C20ILPR FAQ
1.How can I place an order for LM4040C20ILPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C20ILPR 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 LM4040C20ILPR reliable?
The price and inventory of LM4040C20ILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C20ILPR is usually 5 days.
3.What payment methods are accepted for LM4040C20ILPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C20ILPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C20ILPR?
LM4040C20ILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C20ILPR 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 LM4040C20ILPR?
For technical support, including LM4040C20ILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C20ILPR requirements.
6.How does Aetrix verify that LM4040C20ILPR is sourced from the original manufacturer or authorized distributors?
All LM4040C20ILPR 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 LM4040C20ILPR meets industry standards.
7.What is the process for return or replacement of LM4040C20ILPR?
All LM4040C20ILPR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C20ILPR, 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 LM4040C20ILPR part is unused and in its original packaging.
Return procedure for LM4040C20ILPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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