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Texas Instruments LM4040D25IDCKR
- Part No.:
- LM4040D25IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040D25IDCKR.pdf
- Description:
- IC VREF SHUNT 1% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,599
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Product details
Overview
LM4040D25IDCKR from Texas Instruments is a precision 2.5V shunt voltage reference in SC-70-5 package, rated for –40°C to 85°C operation, with ±1.0% initial accuracy, 150ppm/°C temperature coefficient, 35μVRMS noise, and stable operation down to 45μA cathode current. It serves as a compact, low-power voltage基准 in analog-to-digital converters and sensor signal conditioning circuits.
For engineers reviewing the LM4040D25IDCKR datasheet, LM4040D25IDCKR pinout, LM4040D25IDCKR application, or LM4040D25IDCKR equivalent, key selection criteria include guaranteed 2.5V output tolerance over temperature, minimal required cathode current, dynamic impedance under varying load, noise performance in high-resolution measurement paths, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040D25IDCKR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 2.5V reverse breakdown voltage across its terminals. Its Zener-based architecture uses wafer-level fuse and Zener-zap trimming to achieve D-grade accuracy (±1.0% at 25°C) and specified thermal drift (150ppm/°C).
It delivers stable regulation across a wide cathode current range (45μA to 15mA), exhibits low dynamic impedance (≤1.1Ω at 1mA), and maintains low wideband noise (35μVRMS, 10Hz–10kHz) - enabling use in 16-bit+ data acquisition systems where reference stability directly limits effective resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal; tight tolerance enables direct interface with 2.5V ADC references and op-amp bias networks. |
| Initial Accuracy | ±1.0% max at 25°C; defines worst-case offset in calibration-critical sensor front-ends. |
| Temp Coefficient | 150ppm/°C max; contributes ≤±0.25% error over –40°C to 85°C industrial range. |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered IoT sensor nodes. |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures <1mV output shift under 1mA load transients. |
| Output Noise | 35μVRMS (10Hz–10kHz); supports ≥18-bit ENOB in precision SAR ADC applications. |
| Operating Temp | –40°C to +85°C; qualified for industrial control and automotive cabin electronics. |
Pinout & Package
LM4040D25IDCKR is packaged in a 5-pin SC-70 (DCK) outline measuring 2.00mm × 1.25mm. The package includes two no-connect (NC) pins to support pin-compatible variants and improve layout flexibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input / voltage reference node | Connected to supply rail; sinks current to regulate voltage at this node to 2.5V. |
| Anode (Pin 1) | Common return / ground reference | Typically tied to system ground; forms the reference potential for output voltage. |
| NC (Pins 4, 5) | No internal connection | Must be left unconnected or grounded per layout best practices; no electrical function. |
| Pin 2* | Internal Zener anode tie point | Must float or connect to anode; improves EMI immunity in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - simplifies BOM and PCB layout in space-constrained modules. |
| Low 35μVRMS noise | Enables high-fidelity signal chains in 16-bit+ data acquisition without additional filtering. |
| 45μA minimum operating current | Supports micropower designs including energy-harvesting sensors and always-on monitoring nodes. |
| 150ppm/°C tempco (D grade) | Provides predictable, bounded drift for factory-calibrated instruments operating across temperature gradients. |
| SC-70-5 package | 0.65mm pitch, 2.0×1.25mm footprint - ideal for portable medical devices and modular I/O systems. |
Applications
| Data-Acquisition Systems | Analog Input Module |
|---|---|
Use Scenario: High-resolution ADC reference in PLC analog input cards with 0–10V or ±10V ranges. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5V reference for successive-approximation register (SAR) ADCs. Use Value: ±1.0% initial accuracy and 150ppm/°C drift ensure calibrated measurement repeatability across ambient temperature swings. | Use Scenario: Precision scaling and offset adjustment in industrial analog input signal conditioners. IC Role / Device Role / Timing Role: Reference source for programmable gain instrumentation amplifiers and bipolar DAC buffers. Use Value: Low 35μVRMS noise prevents degradation of SNR in 24-bit sigma-delta ADC front-ends. |
| Field Transmitters | Energy Infrastructure |
Use Scenario: 4–20mA loop-powered temperature/pressure transmitter with onboard ADC and microcontroller. IC Role / Device Role / Timing Role: Micropower voltage reference supplying excitation and conversion reference for RTD/thermocouple interfaces. Use Value: 45μA min cathode current enables operation within strict 3.5mA loop budget while maintaining 2.5V stability. | Use Scenario: Voltage reference in smart meter metrology ICs and grid-edge power quality analyzers. IC Role / Device Role / Timing Role: Primary reference for anti-aliasing filter cutoff tuning and ADC full-scale calibration. Use Value: Long-term stability (120ppm after 1000h) supports 10-year metrology certification requirements. |
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 | 2.5V, ±0.5% initial accuracy, 75ppm/°C, SOT-23-3, 60μA min current | Higher accuracy and lower tempco; requires higher minimum current and lacks NC pins | Select when tighter drift and accuracy are prioritized over ultra-low current consumption. |
| REF3025AIDBZR | 2.5V, ±0.2% initial accuracy, 50ppm/°C, SOT-23-3, 50μA min current, series topology | Series reference with higher output drive capability but requires input headroom and external capacitor | Select when sourcing >1mA load current or needing better PSRR than shunt topology permits. |
Compared with TL4050C25IDBZR and REF3025AIDBZR, the LM4040D25IDCKR offers lowest quiescent current and simplest 2-pin implementation, making it optimal for passive, space-limited, or loop-powered designs where absolute accuracy is secondary to power and layout simplicity.
Availability
LM4040D25IDCKR is available at Aetrix Electronics and suitable for data-acquisition systems, field transmitters, and energy infrastructure applications requiring stable component supply, long-term calibration integrity, and industrial temperature operation.
Supply support for LM4040D25IDCKR 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 for industrial, automotive, and personal electronics markets.
The LM4040 series is designed as a family of precision micropower shunt voltage references targeting cost-sensitive, space-constrained, and low-power applications including portable instrumentation, sensor modules, and industrial process control.
FAQ
What is the maximum cathode current rating for LM4040D25IDCKR?
The absolute maximum cathode current for LM4040D25IDCKR is 25mA, as specified in the Absolute Maximum Ratings table. However, the recommended operating range is 45μA to 15mA. Exceeding 15mA may increase self-heating and degrade long-term stability; sustained operation above 25mA risks permanent damage. Designers should verify thermal dissipation using RθJA = 252°C/W for the SC-70 package.
Does LM4040D25IDCKR require an output capacitor for stability?
No, LM4040D25IDCKR does not require an output capacitor for stability. Its internal design ensures unconditional stability with all capacitive loads, including direct connection to ADC reference inputs or op-amp feedback nodes. This eliminates capacitor-related aging, leakage, and board space concerns - a key advantage over many series references.
What is the thermal hysteresis specification for LM4040D25IDCKR?
The thermal hysteresis of LM4040D25IDCKR is 0.08%, defined as the voltage difference measured at 25°C after cycling between –40°C and 125°C. This low hysteresis ensures repeatable reference voltage behavior during thermal cycling in field-deployed equipment such as outdoor energy monitors or industrial controllers subject to diurnal temperature swings.
Can LM4040D25IDCKR be used in automotive under-hood applications?
LM4040D25IDCKR is characterized for –40°C to +85°C operation (industrial grade), not extended automotive temperature range. For under-hood applications requiring operation up to 125°C ambient, TI offers the Q-grade variant LM4040D25QDBZR (–40°C to +125°C). Using LM4040D25IDCKR beyond 85°C ambient violates its qualified operating conditions and may result in uncharacterized drift or reliability risk.
How does the 150ppm/°C temperature coefficient impact system accuracy over temperature?
With a 2.5V nominal output and 150ppm/°C coefficient, LM4040D25IDCKR contributes up to ±0.25% output variation over its full –40°C to +85°C range (ΔT = 125°C). That equates to ±6.25mV total drift. In a 16-bit system with 2.5V full scale, this corresponds to ~4 LSB of error - acceptable for many industrial sensing applications but requiring calibration compensation in metrology-grade designs.
LM4040D25IDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°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:
- SC-70-5
LM4040D25IDCKR FAQ
1.How can I place an order for LM4040D25IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D25IDCKR 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 LM4040D25IDCKR reliable?
The price and inventory of LM4040D25IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D25IDCKR is usually 5 days.
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LM4040D25IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D25IDCKR 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 LM4040D25IDCKR?
For technical support, including LM4040D25IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D25IDCKR requirements.
6.How does Aetrix verify that LM4040D25IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040D25IDCKR 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 LM4040D25IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040D25IDCKR?
All LM4040D25IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D25IDCKR, 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 LM4040D25IDCKR part is unused and in its original packaging.
Return procedure for LM4040D25IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D25IDCKR Tags
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