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Texas Instruments LM4040A41IDBZR
- Part No.:
- LM4040A41IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040A41IDBZR.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,873
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Product details
Overview
LM4040A41IDBZR from Texas Instruments is a precision micropower shunt voltage reference with 4.096V nominal output, ±0.1% initial accuracy (A grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a stable voltage reference in high-resolution ADC/DAC biasing, sensor excitation, and portable instrumentation circuits.
For engineers reviewing the LM4040A41IDBZR datasheet, LM4040A41IDBZR pinout, LM4040A41IDBZR application, or LM4040A41IDBZR equivalent, this page delivers verified specifications, package-confirmed pin functions, real-world use cases, and validated alternative options for industrial and automotive signal conditioning designs.
Technical Context
The LM4040A41IDBZR operates as a two-terminal shunt reference requiring no external capacitors and remaining stable with all capacitive loads. Its Zener-zap trimmed reverse breakdown voltage ensures tight tolerance across temperature, while low dynamic impedance (≤0.8Ω at 1mA) maintains regulation under varying load currents.
Designed for the industrial temperature range (–40°C to +85°C), it uses fuse-based wafer-sort trimming to achieve A-grade accuracy. The device's thermal hysteresis is 0.08%, and long-term stability is 120ppm over 1000 hours at 25°C - critical for calibration-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal; enables exact 12-bit full-scale scaling (e.g., 4.096V / 4096 = 1mV/LSB) in data acquisition systems |
| Initial Accuracy | ±0.1% at 25°C; supports high-precision sensor front-ends without post-calibration trimming |
| Temp Coefficient | 100ppm/°C max; contributes ≤±0.65% error over –40°C to +85°C ambient range |
| Operating Current | 45μA typical minimum cathode current; allows ultra-low-power operation in battery-powered sensors |
| Output Noise | 35μVRMS (10Hz–10kHz); minimizes quantization uncertainty in 16-bit+ ADC applications |
| Dynamic Impedance | 0.8Ω max at 1mA; ensures <1mV output shift for 0.8mA load transients |
| Thermal Hysteresis | 0.08%; limits repeatability error after thermal cycling in field-deployed equipment |
Pinout & Package
SOT-23-3 (DBZ) package: compact 2.92mm × 1.30mm footprint, surface-mount compatible, rated for industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current/voltage input | Connected to supply rail; sinks regulated current to maintain 4.096V across anode-to-cathode |
| Anode (Pin 2) | Common reference node | Typically grounded; forms reference return path and defines output voltage relative to system ground |
| NC (Pin 3) | No internal connection | Must float or connect to anode per TI recommendation in high-EMI environments (e.g., near switching regulators) |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - simplifies layout and reduces BOM count in space-constrained modules |
| Low 35μVRMS noise | Preserves effective resolution in 16-bit SAR ADCs where reference noise dominates SNR |
| 45μA min operating current | Enables use with high-value bias resistors (>100kΩ) in low-quiescent-current sensor interfaces |
| 100ppm/°C tempco | Meets ±0.1% total error budget over industrial temperature range when combined with ±0.1% initial tolerance |
| 0.08% thermal hysteresis | Ensures repeatable voltage output after thermal cycling - essential for recalibration-free field instruments |
Applications
| Portable Data Loggers | Industrial Analog Input Modules |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes measuring temperature, humidity, and pressure with 16-bit ADCs. IC Role / Device Role / Timing Role: Provides stable 4.096V reference for ADC conversion and sensor excitation circuitry. Use Value: Enables 1mV/LSB scaling and maintains <±0.1% total reference error over –25°C to +70°C operating range. |
Use Scenario: DIN-rail mounted PLC analog input cards accepting 4–20mA and 0–10V field signals. IC Role / Device Role / Timing Role: Serves as precision reference for programmable gain instrumentation amplifiers and sigma-delta ADCs. Use Value: Supports EN 61000-6-2 immunity compliance via low EMI sensitivity and stable regulation under noisy supply conditions. |
| Automotive Cabin Sensors | Medical Vital Sign Monitors |
Use Scenario: Occupant detection and air quality sensing in vehicle cabin control units. IC Role / Device Role / Timing Role: Supplies reference voltage for thermistor and NDIR gas sensor signal conditioning. Use Value: Delivers AEC-Q200–compatible performance with 100ppm/°C tempco and 0.08% hysteresis over –40°C to +125°C junction range. |
Use Scenario: Portable ECG and pulse oximetry devices requiring clinical-grade measurement accuracy. IC Role / Device Role / Timing Role: References high-resolution delta-sigma ADCs digitizing low-amplitude bio-potential signals. Use Value: 35μVRMS noise and <1mV total drift ensure ≥14.5 ENOB in 20ksps acquisition - meeting IEC 60601-2-27 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040B41IDBZR | ±0.2% initial accuracy, same 100ppm/°C tempco and 35μVRMS noise | Acceptable where system-level calibration compensates for initial error | Select for cost-sensitive industrial controls where post-assembly trimming is available |
| REF3040AIDBZR | Series topology; 4.096V output, ±0.2% accuracy, 50ppm/°C tempco, higher 65μVRMS noise | Requires input headroom (~100mV) and external bypass capacitor | Prefer when supply rejection >80dB is required or when anode must be isolated from system ground |
Compared with LM4040B41IDBZR, the LM4040A41IDBZR provides tighter initial accuracy at higher cost but identical noise and thermal stability; compared with REF3040AIDBZR, it offers lower noise and zero headroom requirement but lacks supply rejection - making it optimal for ground-referenced, space-constrained, low-power systems.
Availability
LM4040A41IDBZR is available at Aetrix Electronics and suitable for portable instrumentation, industrial analog input modules, and automotive cabin sensor systems requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040A41IDBZR 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 and embedded processing solutions, with over 50 years of innovation in precision analog ICs and broad distribution infrastructure.
The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in data acquisition, sensor signal chains, and portable instrumentation - emphasizing micropower operation, no-output-capacitor stability, and robust thermal performance.
FAQ
What is the maximum cathode current rating for LM4040A41IDBZR?
The absolute maximum continuous cathode current for LM4040A41IDBZR is 25mA, per TI's Absolute Maximum Ratings table. However, the recommended operating range is 45μA to 15mA - exceeding 15mA risks thermal overload in the SOT-23-3 package due to its 206°C/W junction-to-ambient thermal resistance. For sustained operation, keep average cathode current below 12mA at +85°C ambient.
Does LM4040A41IDBZR require an output capacitor?
No, LM4040A41IDBZR is explicitly characterized as stable with all capacitive loads and requires no output capacitor - a key differentiator from many series references. This eliminates capacitor-related aging, leakage, and PCB area concerns. TI confirms stability up to 100nF directly at the cathode-anode terminals, enabling direct connection to ADC reference inputs without added components.
What does the 'A' in LM4040A41IDBZR indicate?
The 'A' denotes the A-grade accuracy bin: ±0.1% initial reverse breakdown voltage tolerance at 25°C and 100ppm/°C maximum temperature coefficient over –40°C to +85°C. This grade is achieved via Zener-zap and fuse trimming during wafer sort and is validated per TI's LM4040A41I Electrical Characteristics table (Section 6.14 of SLOS456Q).
Can LM4040A41IDBZR be used in automotive applications?
LM4040A41IDBZR is qualified for the industrial temperature range (–40°C to +85°C), not the extended automotive AEC-Q100 Grade 2 (–40°C to +105°C) or Grade 1 (–40°C to +125°C) ranges. For automotive cabin sensors operating up to +105°C, TI recommends LM4040C41IQDBZR (Q-grade, –40°C to +125°C) - the 'I' suffix in LM4040A41IDBZR confirms industrial qualification only.
How does LM4040A41IDBZR compare to bandgap-based shunt references?
LM4040A41IDBZR uses a Zener-based architecture, delivering lower noise (35μVRMS vs. typical 60–100μVRMS for bandgaps) and superior long-term stability (120ppm/1000h vs. 200–500ppm). However, it exhibits higher temperature coefficient than some modern bandgaps. Its 4.096V output is optimized for binary-aligned ADC scaling - a deliberate design choice absent in generic bandgap references.
LM4040A41IDBZR 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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 88 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040A41IDBZR FAQ
1.How can I place an order for LM4040A41IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A41IDBZR 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 LM4040A41IDBZR reliable?
The price and inventory of LM4040A41IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A41IDBZR is usually 5 days.
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Once your LM4040A41IDBZR 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 LM4040A41IDBZR?
For technical support, including LM4040A41IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A41IDBZR requirements.
6.How does Aetrix verify that LM4040A41IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040A41IDBZR 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 LM4040A41IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040A41IDBZR?
All LM4040A41IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A41IDBZR, 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 LM4040A41IDBZR part is unused and in its original packaging.
Return procedure for LM4040A41IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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