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Texas Instruments LM4040A41IDBZRG4
- Part No.:
- LM4040A41IDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040A41IDBZRG4.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,626
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Product details
Overview
LM4040A41IDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference with 4.096 V nominal output, ±0.1% initial accuracy (A grade), 100 ppm/°C temperature coefficient, 35 μVRMS wideband noise, and stable operation from 45 μA to 15 mA cathode current - used in high-accuracy analog input modules and data-acquisition systems.
For engineers reviewing the LM4040A41IDBZRG4 datasheet, LM4040A41IDBZRG4 pinout, LM4040A41IDBZRG4 application, or LM4040A41IDBZRG4 equivalent, this page delivers verified specifications, SOT-23-3 package details, thermal hysteresis (0.08%), long-term stability (120 ppm), and real-world implementation guidance for industrial and automotive sensing circuits.
Technical Context
The LM4040A41IDBZRG4 operates as a two-terminal shunt reference, sinking cathode current (IZ) to regulate voltage across its terminals. Its Zener-zap trimmed bandgap core ensures tight initial tolerance and low drift over –40°C to +85°C ambient range, with dynamic impedance under 0.8 Ω at 1 mA enabling fast transient response in feedback loops.
No external capacitor is required for stability, and it maintains regulation across all capacitive loads - including those found in isolated ADC front-ends and sensor signal conditioning stages. The device's low 45 μA minimum operating current supports battery-powered instrumentation without compromising accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal - precisely matches 12-bit DAC/ADC full-scale reference points and enables direct binary-scaled measurement without scaling resistors. |
| Initial Accuracy | ±0.1% at 25°C - ensures ≤ ±4.1 mV absolute error in calibration-critical applications like field transmitter zero/span adjustment. |
| Tempco | 100 ppm/°C max - contributes ≤ ±6.5 mV drift over –40°C to +85°C, meeting Class A industrial sensor accuracy requirements. |
| Wideband Noise | 35 μVRMS (10 Hz–10 kHz) - low enough to avoid degrading ENOB in 16-bit SAR ADCs when used as reference source. |
| Min Cathode Current | 45 μA typical - allows operation from ultra-low-power LDOs or high-value bias resistors in energy-harvesting sensor nodes. |
| Dynamic Impedance | 0.3–0.8 Ω at 1 mA - minimizes load-induced voltage shift during fast digital switching events in mixed-signal PCBs. |
| Thermal Hysteresis | 0.08% - corresponds to ≤ ±3.3 mV hysteresis after thermal cycling, critical for repeatable calibration in test equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: compact 2.92 mm × 1.30 mm footprint with gull-wing leads, optimized for automated assembly and space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage regulation node | Connected to supply rail; sinks variable current to maintain 4.096 V across anode–cathode - must be decoupled locally if driving noisy loads. |
| Anode (Pin 2) | Reference ground / common return | Typically tied to system ground; forms the 0 V reference point for output voltage measurement - requires low-impedance ground path. |
| NC (Pin 3) | No internal connection | Unused terminal; may be left floating or tied to anode per TI recommendation in EMI-sensitive layouts near transformers or SMPS. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - simplifies layout and avoids instability risks in high-C sensor interfaces (e.g., piezoresistive bridges). |
| Low 35 μVRMS noise | Preserves SNR in precision measurement chains - enables <16-bit effective resolution in 24-bit delta-sigma ADC systems. |
| 45 μA min operating current | Supports operation from high-impedance bias networks - ideal for low-power RTD or thermistor front-ends powered by microcontroller GPIOs. |
| 100 ppm/°C tempco (A grade) | Guarantees predictable drift behavior - allows deterministic error budgeting in closed-loop calibration algorithms without lookup tables. |
| 0.08% thermal hysteresis | Ensures repeatability after thermal cycling - essential for metrology-grade instruments requiring traceable calibration stability. |
Applications
| Analog Input Module | Data-Acquisition System |
|---|---|
Use Scenario: 16-channel industrial analog input card digitizing 4–20 mA sensor signals with 24-bit sigma-delta ADCs. IC Role / Device Role / Timing Role: Primary voltage reference for ADC and programmable gain amplifier (PGA) offset calibration. Use Value: 4.096 V output aligns with integer LSB scaling; ±0.1% accuracy ensures channel-to-channel gain matching within 0.2% across temperature. |
Use Scenario: Portable handheld multimeter with autoranging, true RMS conversion, and battery-powered operation. IC Role / Device Role / Timing Role: Stable reference for dual-slope integrator and auto-zero amplifier stages. Use Value: 45 μA minimum current extends battery life; low noise prevents AC measurement floor degradation below 100 nV/√Hz. |
| Field Transmitter | Energy Infrastructure Monitoring |
Use Scenario: Loop-powered 4–20 mA pressure transmitter operating in hazardous areas with ambient temps up to 85°C. IC Role / Device Role / Timing Role: Precision reference for HART modem DAC and sensor excitation circuitry. Use Value: 100 ppm/°C tempco meets IEC 61293 Class 0.1 accuracy; SOT-23 package fits tight enclosure constraints. |
Use Scenario: Smart electricity meter monitoring grid voltage/current harmonics using isolated ADCs and DSP. IC Role / Device Role / Timing Role: Reference for isolation amplifier secondary-side ADC and anti-aliasing filter calibration. Use Value: Thermal hysteresis ≤0.08% ensures consistent billing accuracy after daily thermal cycles in outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3040AIDBZR | 3.0 ppm/°C typical tempco (vs. 100 ppm/°C max), 25 μVRMS noise, but requires ≥50 μA min current and has 4.096 V option only in DCK (SC-70) package. | Better for lab-grade instruments needing sub-ppm stability; less suitable for high-temp industrial environments where LM4040A41IDBZRG4's guaranteed 100 ppm/°C spec applies. | Select REF3040AIDBZR when ultra-low drift dominates over cost and high-temp guarantee; verify SC-70 layout compatibility. |
| ADR3440ARJZ-R7 | 60 ppm/°C max tempco, 20 μVRMS noise, 4.096 V output, but specified only over –40°C to +125°C and requires ≥100 μA min current. | Preferred for automotive under-hood use due to extended temp range; higher min current limits use in ultra-low-power IoT sensors. | Choose ADR3440ARJZ-R7 for AEC-Q200-compliant designs above 85°C; confirm PCB thermal relief for 125°C operation. |
Compared with REF3040AIDBZR and ADR3440ARJZ-R7, the LM4040A41IDBZRG4 offers the lowest cost-per-accuracy in industrial temperature range applications, with guaranteed 0.1% initial tolerance and proven robustness in loop-powered field devices - making it optimal for cost-sensitive, high-volume analog input modules.
Availability
LM4040A41IDBZRG4 is available at Aetrix Electronics and suitable for analog input modules, field transmitters, and portable data-acquisition systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LM4040A41IDBZRG4 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 with emphasis on reliability, precision, and power efficiency.
The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in industrial automation, test equipment, and sensor signal conditioning - prioritizing ease of use, no-output-capacitor operation, and guaranteed performance across temperature.
FAQ
What is the maximum cathode current rating for LM4040A41IDBZRG4?
The LM4040A41IDBZRG4 has an absolute maximum cathode current of 25 mA, but its recommended operating range is 45 μA to 15 mA. Exceeding 15 mA may increase self-heating beyond thermal design margins, affecting long-term stability and tempco performance. For continuous operation, keep IZ ≤15 mA and ensure PCB copper area provides adequate heat dissipation per TI's RθJA = 206°C/W spec.
Does LM4040A41IDBZRG4 require an output capacitor for stability?
No - the LM4040A41IDBZRG4 is inherently stable with all capacitive loads and does not require an output capacitor. This eliminates risk of oscillation due to capacitor ESR/ESL mismatch and simplifies layout in space-constrained analog input modules. TI explicitly confirms stability across 0–10 μF ceramic, tantalum, and electrolytic capacitors.
What is the thermal hysteresis specification for LM4040A41IDBZRG4?
The LM4040A41IDBZRG4 has a thermal hysteresis of 0.08%, measured as the voltage difference at 25°C after cycling between –40°C and +125°C. This equates to ≤ ±3.3 mV hysteresis for the 4.096 V output - critical for calibration repeatability in field service tools and metrology equipment where thermal cycling is routine.
Can LM4040A41IDBZRG4 operate at 125°C ambient temperature?
No - the LM4040A41IDBZRG4 (suffix 'I') is characterized for –40°C to +85°C ambient operation. For 125°C applications, TI specifies the 'Q' grade variants (e.g., LM4040A41QDBZR), which are AEC-Q100 qualified and tested over –40°C to +125°C. Using LM4040A41IDBZRG4 above 85°C violates its guaranteed specs and risks accelerated parametric drift.
How does the 4.096 V output of LM4040A41IDBZRG4 benefit data-acquisition systems?
The 4.096 V output of LM4040A41IDBZRG4 directly supports binary-scaled full-scale ranges in 12-bit (4096 steps), 16-bit (65536 steps), and 24-bit ADCs - eliminating fractional LSB errors and simplifying firmware scaling. When paired with a 2.048 V reference for differential inputs, it enables precise ratiometric measurements referenced to the same silicon process.
LM4040A41IDBZRG4 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:
- Obsolete
- 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
LM4040A41IDBZRG4 FAQ
1.How can I place an order for LM4040A41IDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A41IDBZRG4 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 LM4040A41IDBZRG4 reliable?
The price and inventory of LM4040A41IDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A41IDBZRG4 is usually 5 days.
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LM4040A41IDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040A41IDBZRG4 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 LM4040A41IDBZRG4?
For technical support, including LM4040A41IDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A41IDBZRG4 requirements.
6.How does Aetrix verify that LM4040A41IDBZRG4 is sourced from the original manufacturer or authorized distributors?
All LM4040A41IDBZRG4 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 LM4040A41IDBZRG4 meets industry standards.
7.What is the process for return or replacement of LM4040A41IDBZRG4?
All LM4040A41IDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A41IDBZRG4, 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 LM4040A41IDBZRG4 part is unused and in its original packaging.
Return procedure for LM4040A41IDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A41IDBZRG4 Tags
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TL431AIDBZR
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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