LM4040A20IDCKRE4 Texas Instruments Integrated Circuit (SOT23 (5-Pin)) In Stock
Texas Instruments LM4040A20IDCKRE4 is a precision 2.048 V micro-power shunt voltage reference with 0.1% initial accuracy, two-terminal operation, and output range of 2.046 V to 2.050 V, packaged in a 5-pin SOT-23 for compact ADC and DAC reference applications. Available worldwide.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- OBSOLETE
- Datasheet
- LM4040A20IDCKRE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM4040A20IDCKRE4?
- 2.048 V precision output aligns exactly with 12-bit ADC full-scale references (1 LSB = 0.5 mV), simplifying code calculations
- 0.1% (Grade A) initial accuracy eliminates the need for external trim in most production applications
- Two-terminal shunt reference topology enables use with a single series resistor, minimizing external components
- Micro-power quiescent current suitable for battery-operated instruments and always-on sensor nodes
- 5-pin SOT-23 surface-mount package for space-constrained PCB designs with tape-and-reel availability
What is LM4040A20IDCKRE4 used for?
The LM4040A20IDCKRE4 is used as a precision voltage reference for 12-bit and 16-bit ADCs and DACs where the 2.048 V value conveniently maps to binary full-scale values. Its micro-power two-terminal shunt architecture suits always-on reference nodes in battery-operated data loggers, portable calibration equipment, and 4–20 mA current loop transmitters. The 0.1% grade ensures measurement accuracy without factory calibration in medical monitoring and industrial instrumentation applications.
What are the specifications of LM4040A20IDCKRE4?
| YTEOL | 0 |
| Analog IC - Other Type | TWO TERMINAL VOLTAGE REFERENCE |
| JESD-30 Code | R-PDSO-G5 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Voltage-Max | 2.05V |
| Output Voltage-Min | 2.046V |
| Output Voltage-Nom | 2.048V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP5/6,.08 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temp Coef of Voltage-Max | 100ppm/°C |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trim/Adjustable Output | NO |
| Voltage Tolerance-Max | 0.1% |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the LM4040A20IDCKRE4 datasheet?
LM4040A20IDCKRE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LM4040A20IDCKRE4?
Compatible alternatives and drop-in replacements for LM4040A20IDCKRE4:
Frequently Asked Questions
Why is a 2.048 V reference voltage particularly useful when designing with 12-bit ADCs?
With a 2.048 V reference, a 12-bit ADC resolves 4096 codes across 2.048 V, giving exactly 0.5 mV per LSB. This clean binary relationship simplifies firmware conversion math—voltage in millivolts equals the raw ADC code divided by 2—eliminating floating-point scaling overhead in embedded microcontroller applications that need fast, deterministic computation.
How accurate is the LM4040A20IDCKRE4 output voltage and what initial error does the A grade imply?
The LM4040A20IDCKRE4 A grade specifies 0.1% initial accuracy, meaning the output voltage is guaranteed between 2.046 V and 2.050 V at room temperature (±2 mV around the 2.048 V nominal). For a 12-bit ADC this corresponds to a worst-case full-scale gain error of about 4 LSBs, which is within the calibration budget of most industrial measurement systems without per-unit trimming.
How do you set the operating current for LM4040A20IDCKRE4 using a single external resistor?
As a two-terminal shunt reference, the LM4040A20IDCKRE4 requires only a series resistor R between the supply voltage and the reference pin. The resistor value is calculated as R = (Vsupply - 2.048 V) / I_set, where I_set is typically 0.1 mA to 15 mA. For a 3.3 V supply targeting 1 mA, R = (3.3 - 2.048) / 0.001 = 1.252 kΩ, so a standard 1.27 kΩ resistor works.
Can LM4040A20IDCKRE4 be used in a 4 to 20 mA loop transmitter circuit operating from a 24 V industrial loop supply?
Yes, the LM4040A20IDCKRE4 functions in 4–20 mA loop transmitters. With a 24 V loop supply, the series resistor is sized to keep the shunt current within the specified range of 0.1 mA to 15 mA while the DAC or ADC reference draws its bias current from the stable 2.048 V output. The 0.1% accuracy directly translates to less than 0.016 mA full-scale error in the current loop, meeting IEC 61508 requirements for many process variable transmitters.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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