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Texas Instruments LM4040B41IDBZR
- Part No.:
- LM4040B41IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040B41IDBZR.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,058
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Product details
Overview
LM4040B41IDBZR from Texas Instruments is a precision micropower shunt voltage reference with 4.096V nominal output, ±0.2% initial accuracy (B grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, capacitor-free reference in high-accuracy analog signal chains for industrial data acquisition.
For engineers reviewing the LM4040B41IDBZR datasheet, LM4040B41IDBZR pinout, LM4040B41IDBZR application, or LM4040B41IDBZR equivalent, key selection criteria include its 4.096V output aligned with 12-bit DAC/ADC full-scale ranges, low thermal hysteresis (0.08%), extended industrial temperature range (–40°C to 85°C), and SOT-23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4040B41IDBZR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 4.096V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design delivers tight initial tolerance and low drift without requiring external compensation components.
It achieves stability with all capacitive loads-including no output capacitor-due to inherently low dynamic impedance (≤0.8Ω at 1mA) and controlled internal parasitics. The device's thermal hysteresis of 0.08% and long-term stability of 120ppm over 1000 hours support repeatable performance in field-deployed instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal; matches standard 12-bit full-scale binary scaling (2¹² = 4096) for direct ADC/DAC reference use. |
| Initial Accuracy | ±0.2% at 25°C; ensures ≤±8.2mV absolute error before temperature or load effects. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±6.5mV drift over –40°C to 85°C ambient range. |
| Noise (10Hz–10kHz) | 35μVRMS typical; low enough to avoid degrading ENOB in 16-bit+ data converters. |
| Min Cathode Current | 45μA typical; enables ultra-low-power operation in battery-powered sensor nodes. |
| Dynamic Impedance | 0.8Ω max at 1mA; minimizes output voltage shift under varying load currents. |
| Operating Temp Range | –40°C to +85°C; qualified for industrial environments without derating. |
Pinout & Package
LM4040B41IDBZR is packaged in a 3-pin SOT-23 (DBZ) surface-mount package measuring 2.92mm × 1.30mm. The device uses a two-terminal shunt topology with an optional third terminal for EMI mitigation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to supply rail; sinks current to regulate voltage at this node to 4.096V. |
| Anode (Pin 2) | Reference ground return | Typically tied to system ground; forms the reference potential for output voltage measurement. |
| NC (Pin 3) | No internal connection | Must float or be connected to anode per TI recommendation in high-EMI environments. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably with any capacitive load - eliminates BOM cost and layout risk of external output capacitor. |
| Micropower operation | 45μA minimum cathode current enables use in energy-harvesting and coin-cell-powered systems. |
| Low thermal hysteresis | 0.08% voltage shift after thermal cycling between –40°C and 125°C improves repeatability in cyclic environments. |
| High PSRR | 60dB typical supply ripple rejection reduces sensitivity to noisy power rails in mixed-signal systems. |
| Long-term stability | 120ppm drift over 1000 hours supports calibration intervals >5 years in field instruments. |
Applications
| Industrial Data-Acquisition Systems | Energy Infrastructure Monitoring |
|---|---|
Use Scenario: High-resolution voltage measurement in PLC analog input modules sampling 4–20mA transmitters. IC Role / Device Role / Timing Role: Primary voltage reference for 16-bit SAR ADCs, setting full-scale range and offset null point. Use Value: ±0.2% initial accuracy and 100ppm/°C drift ensure <0.1% total unadjusted error over temperature without recalibration. |
Use Scenario: Battery voltage supervision and grid voltage monitoring in solar inverters and smart meters. IC Role / Device Role / Timing Role: Stable reference for isolated voltage sensing circuits using optocoupled or transformer-coupled feedback. Use Value: 35μVRMS noise prevents false triggering in fault-detection comparators operating near threshold. |
| Analog Input Modules | Field Transmitters |
Use Scenario: Multi-channel 4–20mA loop-powered transmitter with integrated ADC and microcontroller. IC Role / Device Role / Timing Role: Shared reference for both ADC and DAC in closed-loop current control circuitry. Use Value: 4.096V output aligns exactly with 12-bit digital codes, eliminating scaling math and quantization error in firmware. |
Use Scenario: Two-wire 4–20mA pressure/temperature transmitter operating from 12–36V loop supply. IC Role / Device Role / Timing Role: Shunt reference regulating internal LDO output used for sensor excitation and signal conditioning. Use Value: 45μA min cathode current allows regulation even at lowest loop current (4mA), ensuring functionality at signal zero. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C41IDBZR | ±0.5% initial accuracy, same 4.096V output and SOT-23 package | Acceptable where lower cost outweighs tighter accuracy; higher drift budget available | Select when system-level calibration compensates for initial error and thermal drift. |
| REF43 4.096V variant | Series topology, 3-pin SOIC, ±0.05% accuracy, 3ppm/°C drift, higher quiescent current (750μA) | Requires input headroom; unsuitable for low-voltage or shunt-configured designs | Choose only if ultra-low drift dominates over power and topology constraints. |
Compared with LM4040C41IDBZR, the LM4040B41IDBZR provides 0.3% tighter initial tolerance at identical cost and footprint; compared with REF43, it offers 17× lower operating current and shunt flexibility but trades 33× higher temperature coefficient - making it optimal for space- and power-constrained industrial sensors where moderate drift is acceptable.
Availability
LM4040B41IDBZR is available at Aetrix Electronics and suitable for industrial data-acquisition systems, energy infrastructure monitoring, and field transmitter designs requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4040B41IDBZR 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-reliability manufacturing.
The LM4040 series was developed to deliver cost-effective, micropower shunt references for industrial and automotive signal-chain applications where board space, power, and long-term stability are critical constraints.
FAQ
What is the maximum cathode current rating for LM4040B41IDBZR?
The absolute maximum cathode current for LM4040B41IDBZR 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 package without heatsinking, and sustained operation above this level degrades long-term stability beyond the specified 120ppm/1000h.
Does LM4040B41IDBZR require an output capacitor for stability?
No, LM4040B41IDBZR is designed to be stable with all capacitive loads and requires no output capacitor. Its internal architecture provides inherent phase margin across the full operating current range (45μA–15mA), eliminating capacitor-related aging, leakage, or ESR concerns that affect accuracy in traditional shunt references.
Can LM4040B41IDBZR be used in automotive applications?
LM4040B41IDBZR is rated for –40°C to +85°C, meeting standard industrial temperature requirements but not AEC-Q200 automotive qualification. For automotive use, TI recommends the LM4040-Q1 variants (e.g., LM4040B41IDBZTQ1), which undergo additional stress testing and lot traceability per automotive standards.
How does the NC pin (Pin 3) function in LM4040B41IDBZR?
Pin 3 of LM4040B41IDBZR is a no-connect terminal with no internal bond wire. TI recommends leaving it floating in standard applications, but connecting it to the anode (Pin 2) in high-EMI environments - such as near switching power supplies or motor drives - to reduce noise coupling into the reference node.
What is the long-term stability specification for LM4040B41IDBZR?
LM4040B41IDBZR exhibits 120ppm typical long-term stability after 1000 hours of operation at 25°C with 100μA cathode current. This value reflects parametric drift due to silicon aging and is independent of temperature cycling or load variation - supporting multi-year calibration intervals in field-deployed instrumentation.
LM4040B41IDBZR 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:
- ±0.2%
- 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
LM4040B41IDBZR FAQ
1.How can I place an order for LM4040B41IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B41IDBZR 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 LM4040B41IDBZR reliable?
The price and inventory of LM4040B41IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B41IDBZR is usually 5 days.
3.What payment methods are accepted for LM4040B41IDBZR?
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LM4040B41IDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B41IDBZR 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 LM4040B41IDBZR?
For technical support, including LM4040B41IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B41IDBZR requirements.
6.How does Aetrix verify that LM4040B41IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040B41IDBZR 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 LM4040B41IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040B41IDBZR?
All LM4040B41IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B41IDBZR, 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 LM4040B41IDBZR part is unused and in its original packaging.
Return procedure for LM4040B41IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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