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Texas Instruments LM4040B20IDBZR
- Part No.:
- LM4040B20IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040B20IDBZR.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:15,915
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Product details
Overview
LM4040B20IDBZR from Texas Instruments is a precision 2.048V shunt voltage reference in SOT-23-3 (DBZ) package, rated for industrial temperature range (–40°C to +85°C), with ±0.2% initial accuracy, 100ppm/°C tempco, 35μVRMS noise, and stable operation down to 45μA cathode current. It serves as a compact, low-power reference in analog-to-digital converters and sensor signal conditioning circuits.
For engineers reviewing the LM4040B20IDBZR datasheet, LM4040B20IDBZR pinout, LM4040B20IDBZR application, or LM4040B20IDBZR equivalent, key selection criteria include output voltage tolerance at 25°C and full temperature range, dynamic impedance under varying cathode current, thermal hysteresis performance, long-term stability, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040B20IDBZR 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 bandgap architecture delivers tight initial tolerance and low temperature coefficient without requiring external components.
It achieves stability across all capacitive loads due to inherent low dynamic impedance (≤0.8Ω at 1mA) and low wideband noise (35μVRMS, 10Hz–10kHz). The device supports operation from 45μA to 15mA cathode current while maintaining specified voltage accuracy over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; enables exact 12-bit full-scale scaling in 5V-rail ADCs (e.g., 2.048V = 1 LSB × 2¹¹) |
| Initial Accuracy | ±0.2% at 25°C; corresponds to ±4.1mV tolerance, critical for calibration-critical instrumentation |
| Tempco | 100ppm/°C max; contributes ≤±6.5mV drift over –40°C to +85°C ambient range |
| Dynamic Impedance | ≤0.8Ω at 1mA; ensures minimal output voltage shift during load transients in precision DAC buffers |
| Noise (10Hz–10kHz) | 35μVRMS typical; supports <16-bit ENOB in high-resolution data acquisition systems |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered sensor nodes |
| Thermal Hysteresis | 0.08% max; limits repeatability error after thermal cycling in field-deployed equipment |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, tape-and-reel compatible; thermally enhanced for power dissipation up to 350mW at TA = 85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to regulated supply rail; sinks current to maintain 2.048V drop between Cathode and Anode |
| Anode (Pin 2) | Reference ground / common return | Typically tied to system ground; forms the 2.048V reference potential relative to this node |
| NC (Pin 3) | No internal connection | Must be left unconnected or floated; no electrical function-no tie to anode required per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor stability | Operates reliably with any capacitive load (0–∞), eliminating need for external bypass and simplifying layout in space-constrained PCBs |
| Wide cathode current range | Functional from 45μA to 15mA-supports both micropower sensor interfaces and higher-current reference buffering |
| Low long-term drift | 120ppm max change after 1000 hours at 25°C-reduces recalibration frequency in metrology-grade equipment |
| ESD robustness | ±2000V HBM rating-survives standard handling and board assembly without additional protection circuitry |
| Extended temp grade option | Q-grade variants (e.g., LM4040B20QDBZR) support –40°C to +125°C; B-grade I-grade is optimized for cost-sensitive industrial use |
Applications
| Portable Data Loggers | Industrial Analog Input Modules |
|---|---|
Use Scenario: Battery-powered environmental sensors logging temperature, humidity, and pressure over months on coin-cell energy. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for 12-bit SAR ADCs sampling sensor outputs at 1ksps. Use Value: 45μA minimum operating current extends battery life beyond 5 years; ±0.2% accuracy ensures traceable measurement integrity without field recalibration. | Use Scenario: DIN-rail mounted PLC analog input card accepting 4–20mA and ±10V field signals in factory automation. IC Role / Device Role / Timing Role: Serves as primary voltage reference for multi-channel 16-bit sigma-delta ADC front-end with programmable gain amplifiers. Use Value: 100ppm/°C tempco and 0.08% thermal hysteresis ensure <0.01% total error across operating temperature swing, meeting IEC 61000-6-2 immunity requirements. |
| Medical Patient Monitors | Automotive Battery Management Systems |
Use Scenario: Compact wearable ECG patch digitizing biopotential signals with ultra-low power consumption. IC Role / Device Role / Timing Role: Supplies reference for low-noise, rail-to-rail input op-amp driving 14-bit successive-approximation ADC. Use Value: 35μVRMS noise floor preserves signal fidelity below 1μV; SC-70/SOT-23 packaging enables miniaturized flex PCB integration. | Use Scenario: Cell-voltage monitoring IC in 12S Li-ion battery packs for EV traction inverters. IC Role / Device Role / Timing Role: Reference for isolated delta-sigma modulators measuring individual cell voltages with galvanic separation. Use Value: Stable operation across –40°C to +85°C ambient ensures consistent 1mV resolution during cold cranking and under-hood thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050B20QDBZR | Same 2.048V output, ±0.2% accuracy, but rated for –40°C to +125°C; higher 150ppm/°C tempco in D-grade variants only-B-grade matches LM4040B20IDBZR | Supports extended automotive under-hood environments where +125°C operation is mandatory | Select when ambient exceeds +85°C; otherwise LM4040B20IDBZR offers lower cost and identical performance at industrial temp range |
| REF3020AIDBZR | 2.048V series reference (not shunt); requires external bypass capacitor; 50ppm/°C tempco; 25μVRMS noise; 50μA quiescent current | Used where low dropout and supply-independent reference are needed-e.g., single-supply microcontroller ADCs with noisy rails | Choose REF3020AIDBZR only if system topology mandates series configuration; LM4040B20IDBZR remains optimal for shunt-based, capacitor-free designs |
Compared with TL4050B20QDBZR and REF3020AIDBZR, the LM4040B20IDBZR uniquely combines shunt topology, zero-output-capacitor stability, and industrial-grade accuracy in the smallest SOT-23 footprint-making it ideal for cost-sensitive, space-constrained, and low-power analog signal chains where ground-referenced biasing is acceptable.
Availability
LM4040B20IDBZR is available at Aetrix Electronics and suitable for portable data loggers, industrial analog input modules, medical patient monitors, and automotive battery management systems requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040B20IDBZR 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 was designed specifically for precision, low-power shunt voltage reference applications-emphasizing micropower operation, capacitor-free stability, and grade-scalable accuracy to meet diverse cost-performance targets in measurement and control systems.
FAQ
What is the maximum cathode current rating for LM4040B20IDBZR?
The absolute maximum cathode current for LM4040B20IDBZR is 25mA, as specified in Section 6.1 Absolute Maximum Ratings. However, the recommended operating range is 15mA maximum to ensure thermal reliability and maintain specified electrical characteristics across temperature. At 15mA and 2.048V, power dissipation reaches 30.7mW-well within the SOT-23-3 package's thermal limits at TA ≤ 85°C.
Does LM4040B20IDBZR require an external output capacitor?
No, LM4040B20IDBZR does not require an external output capacitor. Its internal design ensures stability with all capacitive loads-including 0μF-eliminating the need for external bypass components. This feature simplifies PCB layout, reduces bill-of-materials cost, and improves reliability in high-vibration or high-temperature environments where capacitor aging could degrade performance.
What is the thermal hysteresis specification of LM4040B20IDBZR?
The thermal hysteresis of LM4040B20IDBZR is 0.08% maximum, defined as the voltage difference measured at 25°C after cycling from –40°C versus after cycling from +125°C. This parameter directly impacts measurement repeatability in equipment subjected to repeated thermal cycling-such as outdoor instrumentation-and confirms the device's suitability for applications demanding sub-0.1% long-term voltage consistency.
Can LM4040B20IDBZR be used in automotive applications?
LM4040B20IDBZR is qualified for the industrial temperature range (–40°C to +85°C) and is commonly used in automotive cabin electronics (e.g., infotainment, body control modules). For under-hood applications requiring operation up to +125°C, TI offers the Q-grade variant LM4040B20QDBZR. Both share identical electrical specs except for temperature rating-so LM4040B20IDBZR is appropriate where ambient stays within its specified range.
How does the 100ppm/°C temperature coefficient affect LM4040B20IDBZR's output over temperature?
With a maximum temperature coefficient of 100ppm/°C, LM4040B20IDBZR's output voltage drift is bounded by ±0.65% over its full –40°C to +85°C range (ΔT = 125°C). At 2.048V, this equals ±13.3mV worst-case deviation. Actual drift is typically lower due to parabolic behavior, and the device's low thermal hysteresis (0.08%) ensures repeatable performance after thermal excursions.
LM4040B20IDBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- SOT-23-3
LM4040B20IDBZR FAQ
1.How can I place an order for LM4040B20IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B20IDBZR 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 LM4040B20IDBZR reliable?
The price and inventory of LM4040B20IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B20IDBZR is usually 5 days.
3.What payment methods are accepted for LM4040B20IDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B20IDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040B20IDBZR?
LM4040B20IDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B20IDBZR 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 LM4040B20IDBZR?
For technical support, including LM4040B20IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B20IDBZR requirements.
6.How does Aetrix verify that LM4040B20IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040B20IDBZR 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 LM4040B20IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040B20IDBZR?
All LM4040B20IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B20IDBZR, 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 LM4040B20IDBZR part is unused and in its original packaging.
Return procedure for LM4040B20IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040B20IDBZR Tags
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TL431AIDBZR
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LM4040DIM3X-2.5/NOPB
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