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Texas Instruments LM4040D41IDBZT
- Part No.:
- LM4040D41IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D41IDBZT.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:625
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Product details
Overview
LM4040D41IDBZT from Texas Instruments is a precision micropower shunt voltage reference with a fixed 4.096V output, D-grade (±1.0% initial tolerance, 150ppm/°C tempco), rated for –40°C to 85°C operation in SOT-23-3 (DBZ) package, and designed for high-accuracy analog signal conditioning in data-acquisition systems.
For engineers reviewing the LM4040D41IDBZT datasheet, LM4040D41IDBZT pinout, LM4040D41IDBZT application, or LM4040D41IDBZT equivalent, key selection criteria include cathode current range (45μA–15mA), low 35μVRMS noise, stability with all capacitive loads, and thermal hysteresis of 0.08% over –40°C to 125°C cycling.
Technical Context
The LM4040D41IDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 4.096V reverse breakdown voltage across its terminals. Its Zener-zap trimmed architecture ensures grade-specific accuracy and temperature coefficient without requiring external components.
It delivers low dynamic impedance (≤1.1Ω at 1mA), supports wide operating current (45μA typical minimum), and maintains performance across industrial temperature range (–40°C to 85°C) with no output capacitor needed - enabling compact, low-power designs in space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal; enables precise 12-bit ADC full-scale calibration (e.g., 4.096V = 1 LSB = 1mV for 4096-count range) |
| Initial Tolerance | ±1.0% max at 25°C; defines worst-case DC offset in precision sensor front-ends before trimming |
| Tempco | 150ppm/°C max; contributes ≤±0.614mV drift over 85°C span (–40°C to 85°C) |
| Cathode Current Range | 45μA to 15mA; allows use with high-value bias resistors (>100kΩ) while supporting >10mA load regulation |
| Output Noise | 35μVRMS (10Hz–10kHz); limits effective resolution to ~16.5 ENOB in low-noise 24-bit delta-sigma ADCs |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures <1.1mV output shift per 1mA load transient, critical for multiplexed reference sharing |
| Thermal Hysteresis | 0.08% over –40°C ↔ 125°C cycle; adds ≤±3.3mV uncertainty after thermal stress in field-deployed equipment |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally enhanced plastic body with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to supply rail via current-setting resistor; voltage develops across this terminal relative to anode |
| Anode (Pin 2) | Common reference ground | Typically tied to system ground; forms return path for cathode current and defines 0V reference point |
| NC (Pin 3) | No internal connection | Must be left floating or connected to anode only in high-EMI environments per TI recommendation |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - reduces BOM count and PCB area in portable and modular designs |
| Low 45μA typical minimum cathode current | Enables ultra-low-power operation in battery-backed sensors and energy-harvesting nodes |
| 150ppm/°C max temperature coefficient | Provides predictable, bounded drift in automotive under-hood and industrial control cabinet environments |
| 35μVRMS wideband noise | Supports high-resolution measurement without external filtering in precision weigh scales and medical instrumentation |
| –40°C to 85°C operating range | Qualified for industrial automation, process control, and commercial-grade embedded systems |
Applications
| Data-Acquisition Systems | Analog Input Module |
|---|---|
Use Scenario: High-channel-count PLC analog input card digitizing ±10V industrial signals using 24-bit delta-sigma ADCs. IC Role / Device Role / Timing Role: Primary reference for ADC and DAC converters, providing stable 4.096V full-scale calibration point. Use Value: Enables guaranteed 16-bit effective resolution across temperature due to 150ppm/°C tempco and 0.08% thermal hysteresis. | Use Scenario: DIN-rail mounted analog I/O module converting 4–20mA sensor loops to digital outputs. IC Role / Device Role / Timing Role: Shunt reference for op-amp-based current-to-voltage conversion and ADC reference rail. Use Value: Stable 4.096V output ensures <±0.1% loop accuracy over –25°C to 70°C ambient, meeting IEC 61000-6-2 immunity requirements. |
| Field Transmitters | Energy Infrastructure |
Use Scenario: Two-wire 4–20mA smart transmitter with HART communication, powered from loop. IC Role / Device Role / Timing Role: Low-current shunt reference supplying precision bias for sensor signal conditioning and microcontroller ADC. Use Value: 45μA min cathode current allows operation down to 3.3V loop voltage while maintaining 4.096V reference integrity. | Use Scenario: Smart electricity meter measuring voltage/current with metrology-grade accuracy (IEC 62053-21 Class 0.5). IC Role / Device Role / Timing Role: Reference for polyphase energy measurement ICs (e.g., ADE78xx) requiring stable 4.096V rail. Use Value: 35μVRMS noise and low dynamic impedance ensure <0.01% RMS error contribution to active/reactive energy calculation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C41IDBZR | Same 4.096V output, C-grade (±0.5%), 100ppm/°C tempco, SOT-23-3, but higher 75μA min cathode current | Better initial accuracy and tempco, but less suitable for ultra-low-power (<60μA) designs | Select when tighter DC accuracy is prioritized over minimum operating current |
| MAX6008AEUR+T | 4.096V output, A-grade (±0.1%), 50ppm/°C tempco, SC70-3, 75μA min cathode current, higher 120μVRMS noise | Superior accuracy and stability, but higher noise limits use in 24-bit audio or metrology | Select when long-term stability and low tempco outweigh noise sensitivity in calibration equipment |
Compared with TL4050C41IDBZR and MAX6008AEUR+T, the LM4040D41IDBZT trades initial accuracy and tempco for lower operating current and noise - making it optimal for cost-sensitive, battery-powered industrial sensors where 1% tolerance is acceptable.
Availability
LM4040D41IDBZT is available at Aetrix Electronics and suitable for data-acquisition systems, analog input modules, and field transmitters requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4040D41IDBZT 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The LM4040 series is part of TI's precision voltage reference product line, engineered for high-accuracy, low-power, and robust operation in industrial, energy, and automation applications where long-term stability and thermal resilience are critical.
FAQ
What is the maximum cathode current rating for LM4040D41IDBZT?
The absolute maximum cathode current for LM4040D41IDBZT is 25mA, per TI's Absolute Maximum Ratings. However, the recommended operating range is 45μA to 15mA - exceeding 15mA risks thermal overload in the SOT-23-3 package, especially above 70°C ambient. Derating is required above 85°C case temperature.
Does LM4040D41IDBZT require an output capacitor for stability?
No, LM4040D41IDBZT is inherently stable with all capacitive loads and does not require an output capacitor. This is confirmed in TI's datasheet Section 3 and Section 8.2, which explicitly state "no output capacitor required" and demonstrate stable operation up to 10μF. Adding capacitance may improve noise filtering but is never necessary for loop stability.
What is the thermal hysteresis specification for LM4040D41IDBZT?
The thermal hysteresis of LM4040D41IDBZT is 0.08%, defined as the voltage difference measured at 25°C after cycling between –40°C and 125°C. This value is identical across all LM4040 grades and packages, and directly impacts repeatability in field-repair or recalibration scenarios where equipment undergoes repeated thermal cycling.
Can LM4040D41IDBZT be used in automotive applications?
LM4040D41IDBZT is qualified for –40°C to 85°C operation (industrial grade), not the extended –40°C to 125°C AEC-Q100 automotive temperature range. While it may function in cabin or infotainment systems, TI does not certify or warrant LM4040D41IDBZT for under-hood automotive use. For such applications, LM4040Q variants (e.g., LM4040D41IQDBZR) are specified and tested to automotive standards.
How does the 4.096V output of LM4040D41IDBZT benefit ADC interfacing?
The 4.096V output of LM4040D41IDBZT aligns exactly with binary scaling for 12-bit (1 LSB = 1mV), 16-bit (1 LSB = 62.5μV), and many 24-bit ADCs - eliminating software gain correction and reducing quantization error. When paired with TI's ADS12xx family or Analog Devices' AD77xx, it enables full utilization of digital code range without headroom loss.
LM4040D41IDBZT 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°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
LM4040D41IDBZT FAQ
1.How can I place an order for LM4040D41IDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D41IDBZT 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 LM4040D41IDBZT reliable?
The price and inventory of LM4040D41IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D41IDBZT is usually 5 days.
3.What payment methods are accepted for LM4040D41IDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D41IDBZT transactions.
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4.How is shipping managed for LM4040D41IDBZT?
LM4040D41IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D41IDBZT 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 LM4040D41IDBZT?
For technical support, including LM4040D41IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D41IDBZT requirements.
6.How does Aetrix verify that LM4040D41IDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040D41IDBZT 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 LM4040D41IDBZT meets industry standards.
7.What is the process for return or replacement of LM4040D41IDBZT?
All LM4040D41IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D41IDBZT, 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 LM4040D41IDBZT part is unused and in its original packaging.
Return procedure for LM4040D41IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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