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Texas Instruments LM4040A25IDBZR
- Part No.:
- LM4040A25IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040A25IDBZR.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,239
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Product details
Overview
LM4040A25IDBZR from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5V output with ±0.1% initial accuracy (A grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a low-drift, low-noise reference in high-resolution ADCs and sensor signal chains for industrial process control systems.
For engineers reviewing the LM4040A25IDBZR datasheet, LM4040A25IDBZR pinout, LM4040A25IDBZR application, or LM4040A25IDBZR equivalent, key selection criteria include initial voltage tolerance, thermal stability over –40°C to 85°C, dynamic impedance under varying load current, noise performance in precision analog front-ends, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040A25IDBZR operates as a two-terminal shunt reference, sinking cathode current to maintain a precise 2.5V reverse breakdown voltage across its terminals. Its Zener-zap trimmed bandgap core achieves ±0.1% initial accuracy at 25°C and maintains ≤100ppm/°C drift over –40°C to 85°C ambient.
It exhibits 0.3Ω typical dynamic impedance at 1mA cathode current and delivers 35μVRMS integrated noise (10Hz–10kHz) with no output capacitor required-enabling stable regulation even with heavy capacitive loading in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal; enables direct interface with 2.5V ADC references and rail-to-rail op-amp inputs. |
| Initial Accuracy | ±0.1% at 25°C; supports 12-bit+ system accuracy without calibration in data-acquisition modules. |
| Temp Coefficient | 100ppm/°C max; limits voltage drift to ±19mV over –40°C to 85°C, critical for field transmitter stability. |
| Noise (10Hz–10kHz) | 35μVRMS typical; minimizes added uncertainty in high-gain sensor amplifiers and precision DAC buffers. |
| Cathode Current Range | 45μA to 15mA; allows ultra-low-power operation in battery-powered IoT sensors and full-range drive for active filters. |
| Dynamic Impedance | 0.3Ω typical at 1mA; ensures minimal output voltage shift during fast load transients in closed-loop references. |
| Thermal Hysteresis | 0.08% max; guarantees repeatable voltage after thermal cycling in automotive and energy infrastructure environments. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks all cathode current to establish reference voltage at anode. |
| Anode (Pin 2) | Common ground reference terminal | Must be tied to system ground; defines 0V reference point for the 2.5V output measured between cathode and anode. |
| NC (Pin 3) | No internal connection | Left floating per TI recommendation; not bonded internally and has no electrical function in DBZ package. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.5V output | Eliminates external resistor networks; simplifies BOM and layout for standard reference voltage requirements. |
| Stable with all capacitive loads | Enables direct connection to ADC input capacitors or op-amp feedback networks without series resistance or compensation. |
| Low 45μA minimum operating current | Supports <100μA total system standby current in battery-backed smart meters and portable instrumentation. |
| Extended temperature range | Rated for –40°C to +85°C operation, meeting industrial and automotive under-hood ambient requirements. |
| Low 35μVRMS noise | Reduces effective number of bits (ENOB) degradation in 16-bit+ SAR and delta-sigma ADCs. |
Applications
| Data-Acquisition Systems | Energy Infrastructure |
|---|---|
Use Scenario: High-accuracy voltage measurement in modular PLC analog input cards with 16-bit ADCs. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for ADC conversion and sensor excitation. Use Value: Enables ±0.025% full-scale accuracy over temperature without recalibration, reducing field service costs. |
Use Scenario: Voltage monitoring in solar inverter DC-link sensing and battery management systems. IC Role / Device Role / Timing Role: Serves as precision reference for isolated voltage dividers feeding isolation amplifiers. Use Value: Maintains <±0.5% total error over lifetime and thermal cycling, supporting IEC 62109 compliance. |
| Analog Input Module | Field Transmitters |
Use Scenario: 4–20mA loop-powered analog input module with cold-junction compensation. IC Role / Device Role / Timing Role: Supplies reference for thermocouple amplifier gain-setting and ADC reference. Use Value: Delivers <10ppm/°C effective drift contribution, enabling <±1°C temperature measurement accuracy. |
Use Scenario: Two-wire 4–20mA pressure/flow transmitters operating in harsh industrial environments. IC Role / Device Role / Timing Role: Sets excitation voltage for bridge sensors and reference for output DAC. Use Value: Ensures <±0.1% span error over –40°C to +85°C, meeting HART and FOUNDATION Fieldbus certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5V, ±0.2% initial accuracy, 50ppm/°C tempco, higher 65μA min current, SC70-3 package | Better tempco but looser initial tolerance; requires higher minimum current | Choose when lower temperature drift is prioritized over initial accuracy and ultra-low power. |
| ADR3425ARJZ-R7 | 2.5V, ±0.1% initial accuracy, 10ppm/°C tempco, 100μA min current, SOT-23-5 package with enable pin | Superior tempco and integrated enable function; larger package and higher quiescent current | Choose when system-level power sequencing or <15ppm/°C drift is required, accepting SOT-23-5 footprint. |
Compared with REF3025AIDBZR and ADR3425ARJZ-R7, the LM4040A25IDBZR offers the lowest minimum operating current (45μA) and smallest SOT-23-3 footprint while maintaining A-grade initial accuracy-making it optimal for space- and power-constrained industrial sensor nodes where moderate tempco is acceptable.
Availability
LM4040A25IDBZR is available at Aetrix Electronics and suitable for data-acquisition systems, energy infrastructure monitoring, and field transmitter designs requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LM4040A25IDBZR 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 engineered for cost-sensitive, high-volume industrial and automotive applications demanding micropower operation, robust thermal performance, and shunt topology simplicity without external components.
FAQ
What is the maximum cathode current rating for LM4040A25IDBZR?
The absolute maximum cathode current for LM4040A25IDBZR is 25mA, but the recommended operating range is 45μA to 15mA. Operating above 15mA increases self-heating and may degrade long-term stability and temperature coefficient performance. The LM4040A25IDBZR is optimized for precision at currents up to 15mA, with dynamic impedance rising above that level.
Does LM4040A25IDBZR require an output capacitor for stability?
No, LM4040A25IDBZR is inherently stable with all capacitive loads and does not require an external output capacitor. Its internal design ensures phase margin remains sufficient even when directly driving ADC input capacitors or op-amp feedback networks-eliminating layout constraints and component count associated with traditional shunt references.
What is the thermal hysteresis specification for LM4040A25IDBZR?
The LM4040A25IDBZR has a thermal hysteresis of 0.08% maximum, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to +125°C. This low hysteresis ensures repeatable 2.5V output in applications subject to repeated thermal cycling, such as outdoor energy meters and automotive engine control units.
Can LM4040A25IDBZR be used in automotive applications?
LM4040A25IDBZR is qualified for industrial temperature range (–40°C to +85°C), making it suitable for under-dash automotive applications like body control modules and infotainment power supplies. For under-hood use requiring 125°C operation, the LM4040A25IDBZT (tape-and-reel variant) or LM4040C25Q variants are specified for extended temperature range.
How does the LM4040A25IDBZR achieve ±0.1% initial accuracy?
The LM4040A25IDBZR achieves ±0.1% initial accuracy via laser trimming of Zener and bandgap elements during wafer sort, using fuse and Zener-zap techniques. This post-fabrication calibration ensures tight distribution at 2.5V without requiring external adjustment, delivering consistent performance across production lots without user calibration.
LM4040A25IDBZR 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:
- ±0.1%
- 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
LM4040A25IDBZR FAQ
1.How can I place an order for LM4040A25IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A25IDBZR 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 LM4040A25IDBZR reliable?
The price and inventory of LM4040A25IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A25IDBZR is usually 5 days.
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Once your LM4040A25IDBZR 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 LM4040A25IDBZR?
For technical support, including LM4040A25IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A25IDBZR requirements.
6.How does Aetrix verify that LM4040A25IDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040A25IDBZR 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 LM4040A25IDBZR meets industry standards.
7.What is the process for return or replacement of LM4040A25IDBZR?
All LM4040A25IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A25IDBZR, 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 LM4040A25IDBZR part is unused and in its original packaging.
Return procedure for LM4040A25IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A25IDBZR Tags
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