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Texas Instruments LM4040C25IDBZR
- Part No.:
- LM4040C25IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C25IDBZR.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
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Product details
Overview
LM4040C25IDBZR from Texas Instruments is a precision 2.5V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 85°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 low-power, high-stability reference in analog signal chains for data acquisition and industrial sensing.
For engineers reviewing the LM4040C25IDBZR datasheet, LM4040C25IDBZR pinout, LM4040C25IDBZR application, or LM4040C25IDBZR equivalent, key selection criteria include output tolerance over temperature, minimum operating current, dynamic impedance, noise performance, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040C25IDBZR uses Zener-zap trimming during wafer sort to achieve its C-grade (±0.5%) initial accuracy and maintains tight thermal stability via low-tempco Zener architecture. Its two-terminal shunt topology requires only an external current-limiting resistor and operates across 45μA–15mA cathode current.
It delivers stable 2.5V output with 0.9Ω typical dynamic impedance at 1mA and exhibits no oscillation with any capacitive load-eliminating need for output capacitance. Thermal hysteresis is limited to 0.08% after cycling between –40°C and 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal at IZ = 100μA; fixed, non-adjustable reference point for ADC/DAC biasing and sensor excitation. |
| Initial Accuracy | ±0.5% max at 25°C; defines absolute voltage error before temperature or aging effects. |
| Tempco | 100ppm/°C max over –40°C to 85°C; contributes ≤±0.875% total drift across full industrial range. |
| Min Cathode Current | 45μA typical; enables ultra-low-power operation in battery-powered sensor nodes and portable instrumentation. |
| Wideband Noise | 35μVRMS (10Hz–10kHz); supports high-resolution (≥16-bit) data conversion without added filtering. |
| Dynamic Impedance | 0.9Ω typical at 1mA; ensures minimal output voltage shift under varying load current transients. |
| Long-Term Stability | 120ppm after 1000 hours; indicates predictable aging behavior for calibration-critical systems. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks all cathode current; voltage referenced to anode. |
| Anode (Pin 2) | Common return / ground reference | Typically tied to system ground; forms reference potential for cathode voltage. |
| NC (Pin 3) | No internal connection | Float or tie to anode per EMI mitigation guidance; no electrical function in standard operation. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load - eliminates BOM cost and layout area for output capacitor. |
| Micropower start-up | 45μA minimum cathode current enables use in energy-harvesting and ultra-low-quiescent systems. |
| Low thermal hysteresis | 0.08% voltage shift after –40°C ↔ 125°C cycling - critical for repeatable calibration in field-deployed equipment. |
| High ESD robustness | ±2000V HBM rating - withstands handling and board-level assembly without protection circuitry. |
| Extended temp grade option | LM4040C25Q variant available for –40°C to 125°C - same electrical specs, wider ambient range. |
Applications
| Industrial Data Acquisition | Smart Field Transmitter |
|---|---|
|
Use Scenario: High-accuracy 16-bit ADC front-end in PLC analog input modules. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for ADC VREF, directly determining full-scale accuracy and INL performance. Use Value: ±0.5% initial tolerance and 100ppm/°C tempco ensure <±0.1% total reference error across –40°C to 85°C, meeting Class A industrial accuracy requirements. |
Use Scenario: Two-wire 4–20mA loop-powered pressure/temperature transmitter. IC Role / Device Role / Timing Role: Supplies precise excitation voltage to bridge sensors and reference for DAC-controlled current output stage. Use Value: 45μA min operating current allows full functionality even at lowest loop current (≤4.2mA), maximizing usable dynamic range. |
| Energy Infrastructure Monitoring | Automotive Battery Sensor Module |
|
Use Scenario: DC bus voltage monitoring in solar inverters and EV charging stations. IC Role / Device Role / Timing Role: Reference for isolated voltage sensing ICs and anti-aliasing filter biasing in high-voltage measurement paths. Use Value: 35μVRMS low noise prevents degradation of SNR in high-gain isolation amplifiers, supporting <0.1% measurement accuracy. |
Use Scenario: Compact battery cell voltage monitor in 12V/48V automotive subsystems. IC Role / Device Role / Timing Role: Stable reference for microcontroller's internal ADC used to sample cell voltages and thermistors. Use Value: SOT-23-3 footprint and –40°C to 85°C rating enable direct placement on space-constrained battery management PCBs with no derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C25IDBZR | Same 2.5V output, ±0.5% accuracy, SOT-23-3 package; lower 30μVRMS noise but higher 60μA min cathode current. | Better noise performance suits ultra-high-resolution metrology; higher min current limits use in sub-60μA power budgets. | Select TL4050C25IDBZR when noise <30μVRMS is mandatory and system can support ≥60μA reference current. |
| MAX6008AEUR+T | 2.5V, ±0.2% initial accuracy (A-grade), SC70-3 package; 20μVRMS noise, 50μA min current, but only rated to 85°C. | Higher accuracy and lower noise benefit calibration-grade instruments; SC70-3 is smaller but less thermally robust than SOT-23. | Choose MAX6008AEUR+T for lab-grade test equipment where 0.2% tolerance and 20μVRMS noise outweigh industrial temp range needs. |
Compared with TL4050C25IDBZR and MAX6008AEUR+T, the LM4040C25IDBZR offers the broadest industrial temperature coverage (–40°C to 85°C) with lowest minimum operating current (45μA), making it optimal for ruggedized, ultra-low-power embedded sensing where moderate accuracy suffices.
Availability
LM4040C25IDBZR is available at Aetrix Electronics and suitable for industrial data acquisition, smart field transmitters, and automotive battery sensor modules requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4040C25IDBZR 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 industrial-grade components.
The LM4040 series was designed specifically for cost-sensitive, space-constrained applications needing micropower, high-accuracy shunt references - targeting industrial automation, energy infrastructure, and automotive subsystems.
FAQ
What is the operating temperature range of the LM4040C25IDBZR?
The LM4040C25IDBZR is specified for operation from –40°C to +85°C ambient temperature. This industrial-grade range is confirmed in Section 6.3 (Recommended Operating Conditions) and Table 6.9 of the TI datasheet SLOS456Q. It is not rated for extended temperature (–40°C to 125°C); that capability applies only to Q-grade variants like LM4040C25Q.
Does the LM4040C25IDBZR require an output capacitor?
No, the LM4040C25IDBZR is stable with all capacitive loads and does not require an output capacitor. This is explicitly stated in the Features section and validated in the "Stable with all capacitive loads" bullet. The device's internal design eliminates need for external compensation, simplifying layout and reducing BOM count.
What is the minimum cathode current needed for regulation in the LM4040C25IDBZR?
The LM4040C25IDBZR has a typical minimum cathode current (IZ,min) of 45μA at 25°C, with a maximum of 80μA across –40°C to 85°C. This value is specified in Table 6.9 (LM4040C25I Electrical Characteristics) and enables reliable regulation in ultra-low-power applications such as battery-backed sensors and energy-harvesting nodes.
How does the LM4040C25IDBZR compare to A-grade or B-grade versions of the same family?
The LM4040C25IDBZR provides ±0.5% initial accuracy and 100ppm/°C temperature coefficient - looser than A-grade (±0.1%) or B-grade (±0.2%) variants, but optimized for cost-sensitive industrial applications where moderate precision suffices. Its C-grade specification balances performance, price, and supply chain stability for high-volume deployments.
Can the LM4040C25IDBZR be used in place of the LM4040B25IDBZR?
Yes, the LM4040C25IDBZR is pin-compatible and functionally interchangeable with LM4040B25IDBZR, but with relaxed initial accuracy (±0.5% vs. ±0.2%). System-level validation is required if the design relies on tighter tolerance; otherwise, it serves as a drop-in cost-reduction option where 0.5% error remains within overall system budget.
LM4040C25IDBZR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C25IDBZR FAQ
1.How can I place an order for LM4040C25IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C25IDBZR 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 LM4040C25IDBZR reliable?
The price and inventory of LM4040C25IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25IDBZR is usually 5 days.
3.What payment methods are accepted for LM4040C25IDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C25IDBZR transactions.
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4.How is shipping managed for LM4040C25IDBZR?
LM4040C25IDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C25IDBZR 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 LM4040C25IDBZR?
For technical support, including LM4040C25IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25IDBZR requirements.
6.How does Aetrix verify that LM4040C25IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040C25IDBZR 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 LM4040C25IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040C25IDBZR?
All LM4040C25IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25IDBZR, 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 LM4040C25IDBZR part is unused and in its original packaging.
Return procedure for LM4040C25IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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