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Texas Instruments LM4040A25IDCKR
- Part No.:
- LM4040A25IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040A25IDCKR.pdf
- Description:
- IC VREF SHUNT 0.1% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,187
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Product details
Overview
LM4040A25IDCKR from Texas Instruments is a precision micropower shunt voltage reference with 2.5V nominal output, ±2.5mV (0.1%) initial tolerance at 25°C, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a stable voltage reference in high-accuracy analog signal chains for industrial data acquisition.
For engineers reviewing the LM4040A25IDCKR datasheet, LM4040A25IDCKR pinout, LM4040A25IDCKR application, or LM4040A25IDCKR equivalent, this page delivers verified specifications, package mapping, functional alternatives, and design-critical context for low-power, high-stability reference selection in precision measurement systems.
Technical Context
The LM4040A25IDCKR 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 silicon junction achieves 0.1% initial accuracy and maintains stability over –40°C to 85°C via low thermal hysteresis (0.08%) and tight temperature coefficient control.
It requires no external capacitor, remains stable with all capacitive loads, and delivers low dynamic impedance (0.3Ω typical at 1mA) and low noise-enabling direct use in ADC reference inputs, sensor excitation circuits, and portable instrumentation where supply headroom and board space are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal at 100μA cathode current; enables direct interface with 2.5V ADC references and 3.3V system rails via simple resistor biasing. |
| Initial Tolerance | ±2.5mV (±0.1%) at 25°C; ensures ≤±19mV total error over –40°C to 85°C, critical for <12-bit system accuracy without calibration. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±16.25mV drift across full temperature range, supporting stable performance in uncontrolled environments. |
| Noise (10Hz–10kHz) | 35μVRMS typical; minimizes added uncertainty in high-resolution (≥16-bit) analog-to-digital conversion paths. |
| Min Cathode Current | 45μA typical; allows operation from ultra-low-power sources such as energy-harvesting circuits or battery-backed sensors. |
| Dynamic Impedance | 0.3Ω typical at 1mA; maintains output regulation under fast load transients common in multiplexed sensor front-ends. |
| Long-Term Stability | 120ppm after 1000 hours; supports >10-year field reliability in sealed industrial monitoring equipment. |
Pinout & Package
LM4040A25IDCKR is packaged in a 5-pin SC-70 (DCK) package measuring 2.00mm × 1.25mm. Pin 1 is Anode (ground), Pin 2 is Cathode (output), Pins 4 and 5 are No Connect (NC), and Pin 3 is the floating or anode-connected terminal used for EMI mitigation in noisy environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Common ground node; must be connected to system ground for proper shunt operation and thermal stability. |
| Pin 2 | Cathode | Reference output node; sinks current to regulate voltage; connects to ADC REF+ or sensor bias point. |
| Pins 4 & 5 | No Connect | Internally unconnected; must remain floating or tied to ground per layout best practices-no functional role. |
| Pin 3 | EMI Terminal | Optional connection to anode to reduce high-frequency noise coupling; recommended near transformers or SMPS. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.5V Output | Eliminates external resistor divider errors and reduces BOM count in 2.5V reference designs for SAR ADCs and DACs. |
| 0.1% Initial Accuracy | Enables single-point calibration or zero-calibration-only systems in portable test equipment and field transmitters. |
| No Output Capacitor Required | Simplifies layout and eliminates capacitor aging, leakage, and ESR-related drift-critical for long-life embedded deployments. |
| Stable with All Capacitive Loads | Supports direct connection to ADC input capacitance (e.g., 10–20pF) without oscillation risk or phase margin analysis. |
| –40°C to 85°C Operation | Validated for industrial ambient conditions including factory automation, building controls, and outdoor metering enclosures. |
Applications
| Data-Acquisition Systems | Field Transmitters |
|---|---|
Use Scenario: High-resolution (16–24-bit) analog input modules digitizing 4–20mA loop signals in PLC backplanes. IC Role / Device Role / Timing Role: Precision shunt reference for ADC voltage reference input and current-sense amplifier biasing. Use Value: 0.1% tolerance and 35μVRMS noise ensure <±0.01% total unadjusted error across temperature, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: Loop-powered 4–20mA smart transmitters in oil & gas pressure/temperature sensing. IC Role / Device Role / Timing Role: Stable 2.5V reference for microcontroller ADC, DAC feedback, and sensor excitation. Use Value: 45μA minimum operating current enables reliable startup and regulation even under worst-case 3.5V loop drop conditions. |
| Analog Input Module | Energy Infrastructure |
Use Scenario: DIN-rail mounted analog input cards accepting thermocouple, RTD, and voltage inputs in SCADA systems. IC Role / Device Role / Timing Role: Primary reference for multi-channel simultaneous-sampling ADCs and programmable gain instrumentation amplifiers. Use Value: Low 100ppm/°C tempco and 0.08% thermal hysteresis prevent channel-to-channel gain drift during daily ambient cycling. |
Use Scenario: Revenue-grade electricity meters and grid-edge power quality analyzers requiring metrology-grade accuracy. IC Role / Device Role / Timing Role: Reference source for isolated sigma-delta ADCs measuring voltage, current, and power factor. Use Value: 120ppm long-term stability ensures <0.1% measurement error drift over 10-year service life without field recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040B25IDCKR | 0.2% initial tolerance (±5mV), same 100ppm/°C tempco and noise performance. | Acceptable where system-level calibration compensates for initial error; lower cost for non-critical channels. | Select when BOM cost reduction is prioritized over guaranteed 0.1% accuracy at power-up. |
| REF3025AIDBZR | 2.5V series reference; 0.2% tolerance, 50ppm/°C tempco, higher 65μVRMS noise, requires 50μA supply current. | Requires external pass transistor for high-current loads; not a direct shunt replacement due to topology difference. | Choose only if system architecture mandates series topology or needs tighter tempco than 100ppm/°C. |
Compared with LM4040B25IDCKR, the LM4040A25IDCKR provides 2× tighter initial accuracy at identical noise and thermal performance; compared with REF3025AIDBZR, it offers simpler 2-pin implementation and lower noise but trades off tempco and topology flexibility.
Availability
LM4040A25IDCKR is available at Aetrix Electronics and suitable for data-acquisition systems, field transmitters, and analog input modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4040A25IDCKR 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, space-constrained applications demanding micropower operation and metrology-grade stability-targeting industrial process control, energy metering, and portable instrumentation markets.
FAQ
What is the operating temperature range for LM4040A25IDCKR?
The LM4040A25IDCKR is characterized for operation from –40°C to +85°C (industrial grade). This range is validated per TI's LM4040xxxI specification and supports deployment in factory floors, outdoor enclosures, and HVAC control units without derating.
Does LM4040A25IDCKR require an output capacitor?
No, LM4040A25IDCKR is stable with all capacitive loads and does not require an output capacitor. Its internal design eliminates the need for external stabilization, simplifying PCB layout and improving long-term reliability by removing capacitor-related failure modes.
What is the minimum cathode current needed for regulation in LM4040A25IDCKR?
The LM4040A25IDCKR requires a minimum cathode current of 45μA (typical) to maintain regulation. At 25°C, regulation is guaranteed down to 75μA; over the full –40°C to 85°C range, 80μA ensures stable 2.5V output.
How does the pin configuration of LM4040A25IDCKR differ from SOT-23 versions?
LM4040A25IDCKR uses a 5-pin SC-70 (DCK) package: Pin 1 = Anode, Pin 2 = Cathode, Pins 4–5 = NC, Pin 3 = EMI terminal. Unlike 3-pin SOT-23 variants, the DCK version separates EMI mitigation into a dedicated pin rather than tying it internally, enabling flexible noise suppression strategies.
Can LM4040A25IDCKR replace LM4040A25IDBZR in existing designs?
Yes-LM4040A25IDCKR and LM4040A25IDBZR share identical electrical specifications and 2.5V/0.1% performance, but differ in package (SC-70 vs. SOT-23). Board redesign is required due to footprint and pinout mismatch; however, no circuit revalidation is needed beyond mechanical fit and thermal assessment.
LM4040A25IDCKR 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:
- ±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:
- SC-70-5
LM4040A25IDCKR FAQ
1.How can I place an order for LM4040A25IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040A25IDCKR 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 LM4040A25IDCKR reliable?
The price and inventory of LM4040A25IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040A25IDCKR is usually 5 days.
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4.How is shipping managed for LM4040A25IDCKR?
LM4040A25IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040A25IDCKR 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 LM4040A25IDCKR?
For technical support, including LM4040A25IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040A25IDCKR requirements.
6.How does Aetrix verify that LM4040A25IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040A25IDCKR 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 LM4040A25IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040A25IDCKR?
All LM4040A25IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040A25IDCKR, 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 LM4040A25IDCKR part is unused and in its original packaging.
Return procedure for LM4040A25IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040A25IDCKR Tags
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