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Texas Instruments LM4040C25QDBZR
- Part No.:
- LM4040C25QDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C25QDBZR.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,384
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Product details
Overview
LM4040C25QDBZR from Texas Instruments is a precision 2.5V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 125°C operation, with ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a stable voltage reference in high-accuracy analog signal chains for industrial sensors and data acquisition.
For engineers reviewing the LM4040C25QDBZR datasheet, LM4040C25QDBZR pinout, LM4040C25QDBZR application, or LM4040C25QDBZR equivalent, key selection criteria include extended-temperature-grade shunt reference performance, low-noise operation without output capacitor, and compatibility with high-EMI environments via optional pin 3 connection.
Technical Context
The LM4040C25QDBZR implements a Zener-based shunt reference architecture trimmed via Zener-zap during wafer sort to achieve ±0.5% initial tolerance at 25°C. Its two-terminal configuration requires only an external current-limiting resistor and operates across cathode currents from 45μA to 15mA.
It delivers stable 2.5V output under full –40°C to 125°C ambient conditions with 100ppm/°C max temperature coefficient and exhibits low dynamic impedance (0.9Ω typical at 1mA), enabling minimal voltage drift under load transients in precision ADC biasing and sensor excitation circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal; fixed value set by internal Zener structure, used directly as reference for ADCs, DACs, and comparators. |
| Initial Accuracy | ±0.5% at 25°C; defines maximum deviation before temperature or aging effects, critical for calibration-critical systems. |
| Temp Coefficient | 100ppm/°C max over –40°C to 125°C; ensures ≤±0.25% additional error across full operating range. |
| Wideband Noise | 35μVRMS (10Hz–10kHz); enables high-resolution measurements without added filtering in 16-bit+ data acquisition. |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered field transmitters and portable instrumentation. |
| Dynamic Impedance | 0.9Ω typical at 1mA; maintains <1mV output shift under 1mA load change, supporting stable biasing of op-amp references. |
| Thermal Hysteresis | 0.08% over –40°C ↔ 125°C cycle; limits repeatability error after thermal cycling in automotive and energy infrastructure applications. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally enhanced plastic case 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-limiting resistor; output voltage develops between this pin and 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 float or be connected to Anode (Pin 2); recommended for EMI suppression near transformers or switching noise sources. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably with any capacitive load up to 100nF; eliminates need for output bypass capacitor in space-constrained layouts. |
| Extended temperature grade | Specified from –40°C to 125°C; supports under-hood automotive, grid-edge energy monitoring, and industrial motor control applications. |
| Low quiescent current | 45μA minimum cathode current enables >10-year battery life in wireless sensor nodes with intermittent sampling. |
| Zener-zap trimming | Fuse-based wafer-level calibration achieves tight ±0.5% initial tolerance without post-package adjustment, reducing BOM cost. |
| High ESD robustness | ±2000V HBM rating protects against handling damage during PCB assembly and field maintenance. |
Applications
| Industrial Sensor Signal Conditioning | Energy Infrastructure Monitoring |
|---|---|
Use Scenario: Precision 4–20mA transmitter with RTD or strain gauge input requiring stable 2.5V reference for excitation and ADC conversion. IC Role / Device Role / Timing Role: Shunt reference providing ratiometric excitation voltage and ADC reference simultaneously. Use Value: Enables ±0.1% total unadjusted error (TUE) over temperature without recalibration, meeting IEC 61000-6-2 immunity requirements. | Use Scenario: Smart electricity meter measuring voltage, current, and power quality parameters in outdoor substations. IC Role / Device Role / Timing Role: Primary voltage reference for metrology-grade sigma-delta ADCs sampling at 8kHz. Use Value: 35μVRMS noise and 100ppm/°C TC ensure <0.05% measurement error across –40°C to 70°C ambient, satisfying ANSI C12.20 Class 0.2 accuracy. |
| Automotive Battery Management | Portable Precision Audio |
Use Scenario: Cell voltage monitoring in 12S Li-ion battery packs deployed in commercial EV charging stations. IC Role / Device Role / Timing Role: Reference for 16-bit SAR ADC measuring individual cell voltages with 1mV resolution. Use Value: Extended –40°C to 125°C rating and 0.08% thermal hysteresis prevent drift-induced false fault detection during thermal cycling. | Use Scenario: High-fidelity portable DAC with discrete R-2R ladder requiring ultra-low-noise 2.5V bias. IC Role / Device Role / Timing Role: Low-noise DC reference source for analog output stage and digital logic supply regulation. Use Value: 35μVRMS noise floor avoids audible hiss; capacitor-free operation simplifies layout in compact headphone amplifier PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C25IDBZR | Same electrical specs but rated for –40°C to 85°C industrial temp range; 0.5% accuracy, 100ppm/°C TC, 35μVRMS noise. | Limited to non-automotive, non-outdoor industrial use; unsuitable for under-hood or grid-edge deployments. | Select when ambient temperature stays below 85°C and cost sensitivity outweighs extended-temp qualification. |
| REF3025AIDBZR | 2.5V series reference; 0.2% initial accuracy, 50ppm/°C TC, 28μVRMS noise; requires 50μA supply current and output capacitor. | Higher accuracy and lower noise, but needs external capacitor and cannot sink current like shunt devices. | Choose for ultra-low-drift systems where board space permits series topology and supply headroom exceeds 3.0V. |
Compared with LM4040C25IDBZR, the LM4040C25QDBZR adds 40°C higher max operating temperature and identical accuracy/noise-critical for automotive and energy infrastructure. Versus REF3025AIDBZR, it trades tighter specs for shunt topology flexibility, zero-output-capacitor operation, and lower minimum current.
Availability
LM4040C25QDBZR is available at Aetrix Electronics and suitable for industrial sensor conditioning, energy infrastructure monitoring, and automotive battery management requiring stable component supply across extended temperature ranges.
Supply support for LM4040C25QDBZR 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, embedded processing, and connectivity technologies with over 90 years of innovation history.
The LM4040 series targets precision analog systems needing low-cost, micropower, and robust shunt references-designed specifically for data acquisition, sensor interfaces, and industrial control where reliability across harsh thermal environments is mandatory.
FAQ
What is the maximum operating temperature for the LM4040C25QDBZR?
The LM4040C25QDBZR is characterized for continuous operation from –40°C to +125°C ambient temperature, making it suitable for under-hood automotive, outdoor energy metering, and industrial motor drive applications where thermal stress exceeds standard industrial grade limits. This extended range is confirmed in Section 6.10 of the TI datasheet SLOS456Q.
Does the LM4040C25QDBZR require an output capacitor?
No, the LM4040C25QDBZR is stable with all capacitive loads and does not require an output capacitor for operation-unlike many series references. This simplifies layout and reduces BOM count, especially in space-constrained portable or modular designs. The device's inherent shunt topology and low dynamic impedance (0.9Ω) ensure stability even with up to 100nF of capacitance on the cathode node.
What is the purpose of Pin 3 (NC) on the LM4040C25QDBZR?
Pin 3 on the LM4040C25QDBZR is a no-connect terminal with no internal bond wire. TI recommends leaving it floating or connecting it directly to Pin 2 (Anode) to reduce susceptibility to high-frequency electromagnetic interference-particularly in applications near transformers, inverters, or switching power supplies. This practice is documented in Figure 5-1 and Table 5-1 of the official datasheet.
How does the LM4040C25QDBZR compare to the LM4040C25IDBZR?
The LM4040C25QDBZR and LM4040C25IDBZR share identical electrical specifications-including 2.5V output, ±0.5% initial accuracy, 100ppm/°C temperature coefficient, and 35μVRMS noise-but differ in temperature rating: the 'Q' suffix denotes –40°C to 125°C operation, while the 'I' suffix is limited to –40°C to 85°C. Both use the same SOT-23-3 (DBZ) package and pinout.
What is the minimum cathode current needed for regulation in the LM4040C25QDBZR?
The LM4040C25QDBZR requires a minimum cathode current of 45μA (typical) to maintain regulation at 2.5V. At temperatures up to 125°C, the guaranteed minimum is 80μA per Section 6.10 of the datasheet. Designers must size the current-limiting resistor to ensure this current is met across worst-case supply voltage and temperature conditions.
LM4040C25QDBZR 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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C25QDBZR FAQ
1.How can I place an order for LM4040C25QDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C25QDBZR 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 LM4040C25QDBZR reliable?
The price and inventory of LM4040C25QDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25QDBZR is usually 5 days.
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LM4040C25QDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C25QDBZR 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 LM4040C25QDBZR?
For technical support, including LM4040C25QDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25QDBZR requirements.
6.How does Aetrix verify that LM4040C25QDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040C25QDBZR 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 LM4040C25QDBZR meets industry standards.
7.What is the process for return or replacement of LM4040C25QDBZR?
All LM4040C25QDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25QDBZR, 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 LM4040C25QDBZR part is unused and in its original packaging.
Return procedure for LM4040C25QDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C25QDBZR Tags
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