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Texas Instruments LM4040B20IDCKR
- Part No.:
- LM4040B20IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040B20IDCKR.pdf
- Description:
- IC VREF SHUNT 0.2% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,286
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Product details
Overview
LM4040B20IDCKR from Texas Instruments is a precision 2.048V shunt voltage reference in SC-70-5 package, rated for –40°C to 85°C operation, with ±0.2% initial accuracy (B grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a compact, low-power voltage reference in high-resolution ADC biasing and sensor signal conditioning circuits.
For engineers reviewing the LM4040B20IDCKR datasheet, LM4040B20IDCKR pinout, LM4040B20IDCKR application, or LM4040B20IDCKR equivalent, key selection criteria include guaranteed 2.048V output tolerance over temperature, SC-70 footprint compatibility, no-output-capacitor stability, and suitability for portable or space-constrained industrial sensing nodes.
Technical Context
The LM4040B20IDCKR 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 tight initial tolerance without external components and remains stable with any capacitive load - eliminating need for output capacitance.
It features low dynamic impedance (≤0.8Ω at 1mA), low thermal hysteresis (0.08%), and long-term stability of 120ppm after 1000 hours. The device draws only 45μA minimum cathode current, enabling use in micropower systems where quiescent current directly impacts battery life.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; exact value enables direct interface with 12-bit ADCs using VREF = VDD/2 or binary-scaled references. |
| Initial Accuracy | ±0.2% max at 25°C; ensures ≤±4.1mV absolute error before temperature drift compensation. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±6.5mV drift over –40°C to 85°C ambient range. |
| Min Cathode Current | 45μA typical; allows operation from high-impedance bias networks or ultra-low-power microcontroller GPIOs. |
| Wideband Noise | 35μVRMS (10Hz–10kHz); supports <16-bit effective resolution in precision data acquisition front-ends. |
| Dynamic Impedance | 0.3–0.8Ω at 1mA; minimizes output voltage shift under varying load current in ratiometric sensor bridges. |
| Operating Temp | –40°C to +85°C; qualified for industrial control, field transmitters, and automotive cabin electronics. |
Pinout & Package
LM4040B20IDCKR uses the SC-70-5 (DCK) package: 5-pin, 2.00mm × 1.25mm footprint, with pins 4 and 5 designated as No Connect (NC). Anode (pin 1) connects to system ground; cathode (pin 3) sinks current to establish regulated voltage; pin 2 is the reference output node that must float or tie to anode in high-noise environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input / voltage sense node | Sinks all operating current; voltage at this pin is regulated to 2.048V relative to anode. |
| Anode (Pin 1) | Common return / ground reference | Must be connected to system ground; defines 0V reference for output voltage. |
| Output (Pin 2) | Reference voltage output | Provides 2.048V output; requires floating or connection to anode per EMI mitigation guidance. |
| NC (Pins 4, 5) | No internal connection | Not bonded; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor stability | Operates stably with any capacitive load - eliminates BOM cost and layout area for output capacitor. |
| Micropower operation | 45μA minimum cathode current enables use in energy-harvesting and battery-powered IoT sensors. |
| Low thermal hysteresis | 0.08% hysteresis ensures repeatable voltage after thermal cycling - critical for calibration-critical instrumentation. |
| High PSRR via shunt topology | Inherent rejection of supply ripple due to constant-current sink behavior - simplifies LDO filtering requirements. |
| Space-saving SC-70-5 | 2.00mm × 1.25mm footprint saves >50% board area vs. SOT-23-3 while retaining 5-pin routing flexibility. |
Applications
| Industrial Sensor Transmitter | Precision Data Acquisition |
|---|---|
Use Scenario: 4–20mA loop-powered field transmitter conditioning RTD or thermocouple signals. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for ADC and DAC in analog front-end, enabling 12-bit+ linearity. Use Value: Tight ±0.2% tolerance and 100ppm/°C TC ensure measurement repeatability across factory-floor temperature swings. |
Use Scenario: Portable handheld multimeter or power quality analyzer capturing AC waveforms. IC Role / Device Role / Timing Role: Supplies reference voltage to SAR ADC and programmable gain amplifier in signal chain. Use Value: 35μVRMS noise and low dynamic impedance preserve SNR in 16-bit conversion without post-processing averaging. |
| Automotive Cabin Electronics | Energy Infrastructure Monitoring |
Use Scenario: In-vehicle HVAC control unit measuring cabin temperature and humidity via analog sensors. IC Role / Device Role / Timing Role: Bias reference for sensor signal conditioning op-amps and microcontroller ADC inputs. Use Value: –40°C to +85°C rating and low quiescent current extend operational lifetime in non-climate-controlled enclosures. |
Use Scenario: Smart electricity meter monitoring grid voltage/current with isolation amplifiers and metrology ADCs. IC Role / Device Role / Timing Role: Precision reference for isolated sigma-delta ADCs measuring mains voltage with <0.1% error. Use Value: Long-term stability (120ppm/1000h) maintains calibration integrity over 10+ year utility deployment cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C20IDCKR | ±0.5% initial accuracy (vs. ±0.2%), same 2.048V output and SC-70-5 package. | Acceptable where cost sensitivity outweighs 0.3% additional error budget in non-critical sensing. | Select when total system error budget permits looser tolerance and lower cost is prioritized. |
| TLV431ACDBVR | Adjustable 1.24V reference (not fixed 2.048V); 0.5% accuracy; SOT-23-5 package; higher 80μA min current. | Requires external resistor divider to set 2.048V; less suitable for space-constrained layouts needing exact voltage. | Choose only if design already uses TLV431 family and can accommodate adjustment network and larger current draw. |
Compared with LM4040C20IDCKR and TLV431ACDBVR, the LM4040B20IDCKR delivers tighter initial accuracy without external components or increased quiescent current - making it optimal for fixed-voltage, low-power, high-reliability industrial and automotive sensing nodes.
Availability
LM4040B20IDCKR is available at Aetrix Electronics and suitable for industrial sensor transmitters, portable data acquisition systems, and automotive cabin electronics requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM4040B20IDCKR 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 high-volume manufacturing reliability.
The LM4040 series was engineered specifically for cost-sensitive, space-constrained applications demanding micropower operation, zero-output-capacitor stability, and robust performance across industrial temperature ranges.
FAQ
What is the output voltage tolerance of LM4040B20IDCKR over temperature?
The LM4040B20IDCKR has a maximum initial accuracy of ±0.2% at 25°C and a temperature coefficient of 100ppm/°C. Over the full –40°C to +85°C range, its total output voltage tolerance is ±0.85%, equating to ±17.4mV deviation from the nominal 2.048V output. This is confirmed in Section 6.5 of the TI datasheet SLOS456Q.
Does LM4040B20IDCKR require an output capacitor for stability?
No - the LM4040B20IDCKR is explicitly designed to be stable with all capacitive loads and does not require an output capacitor. This is a core feature verified across all grades and packages in the LM4040 family, including the LM4040B20IDCKR, and is stated in both the Features and Description sections of the official datasheet.
What is the minimum cathode current needed for LM4040B20IDCKR to regulate properly?
The LM4040B20IDCKR requires a minimum cathode current of 45μA (typical) to maintain regulation. At 25°C, the datasheet specifies 45–75μA as the typical range, and up to 80μA across the full temperature range. Below this threshold, the device exits regulation and output voltage drops nonlinearly.
How does the SC-70-5 package of LM4040B20IDCKR differ from SOT-23-3 variants?
The LM4040B20IDCKR uses the SC-70-5 (DCK) package with five pins - cathode (pin 3), anode (pin 1), output (pin 2), and two NC pins (4,5). Unlike SOT-23-3 versions, the DCK variant separates the output node from cathode/anode, allowing optimized noise routing and EMI mitigation by floating or grounding pin 2 independently.
Is LM4040B20IDCKR suitable for automotive applications requiring AEC-Q200 qualification?
No - the LM4040B20IDCKR is specified for the industrial temperature range (–40°C to +85°C) and is not AEC-Q200 qualified. For automotive under-hood or safety-critical use, TI offers the LM4040-Q1 series (e.g., LM4040B20QDBZR), which is explicitly qualified to AEC-Q200 and rated for –40°C to +125°C operation.
LM4040B20IDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- 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:
- Surface Mount
- Supplier Device Package:
- SC-70-5
LM4040B20IDCKR FAQ
1.How can I place an order for LM4040B20IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B20IDCKR 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 LM4040B20IDCKR reliable?
The price and inventory of LM4040B20IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B20IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040B20IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B20IDCKR transactions.
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4.How is shipping managed for LM4040B20IDCKR?
LM4040B20IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B20IDCKR 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 LM4040B20IDCKR?
For technical support, including LM4040B20IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B20IDCKR requirements.
6.How does Aetrix verify that LM4040B20IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040B20IDCKR 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 LM4040B20IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040B20IDCKR?
All LM4040B20IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B20IDCKR, 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 LM4040B20IDCKR part is unused and in its original packaging.
Return procedure for LM4040B20IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040B20IDCKR Tags
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