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Texas Instruments LM4040B25IDCKR
- Part No.:
- LM4040B25IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040B25IDCKR.pdf
- Description:
- IC VREF SHUNT 0.2% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,017
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Product details
Overview
LM4040B25IDCKR from Texas Instruments is a precision 2.5V shunt voltage reference in SC-70-5 package, delivering ±0.2% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current - used for ADC/DAC biasing and sensor signal conditioning in industrial data-acquisition modules.
For engineers reviewing the LM4040B25IDCKR datasheet, LM4040B25IDCKR pinout, LM4040B25IDCKR application, or LM4040B25IDCKR equivalent, key selection criteria include output tolerance over –40°C to 85°C, dynamic impedance under 0.8Ω at 1mA, thermal hysteresis ≤0.08%, no-output-capacitor stability, and compatibility with high-EMI analog front-ends requiring cathode-anode floating control.
Technical Context
The LM4040B25IDCKR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.5V reverse breakdown voltage across its terminals. Its Zener-zap trimmed bandgap core achieves tight initial tolerance without external components, and its low dynamic impedance (≤0.8Ω) ensures minimal output variation under load transients.
Designed for direct replacement of legacy references in space-constrained layouts, it supports full industrial temperature operation (–40°C to 85°C), exhibits 120ppm long-term stability after 1000 hours, and maintains specified performance with any capacitive load - eliminating need for output bypassing in portable or isolated sensing circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal reverse breakdown voltage at IZ = 100μA - sets accurate bias point for 12-bit+ ADCs and precision op-amp references. |
| Initial Accuracy | ±0.2% maximum at 25°C - enables single-point calibration in factory-trimmed systems without post-calibration trimming. |
| Tempco | 100ppm/°C max over –40°C to 85°C - limits drift to ±19mV across full industrial range, critical for unheated field transmitters. |
| Dynamic Impedance | 0.3Ω typical / 0.8Ω max at 1mA - suppresses supply-induced ripple in low-current sensor interfaces (<1mA). |
| Noise (10Hz–10kHz) | 35μVRMS typical - avoids quantization noise floor elevation in 24-bit delta-sigma converters. |
| Min Cathode Current | 45μA typical - allows ultra-low-power operation in battery-backed monitoring nodes with microamp-level sleep currents. |
| Thermal Hysteresis | 0.08% max - ensures repeatable voltage after thermal cycling in automotive cabin sensors and energy metering housings. |
Pinout & Package
LM4040B25IDCKR uses the 5-pin SC-70 (DCK) package (2.00mm × 1.25mm), with pins 1 (Anode), 3 (Cathode), and 4–5 (No Connect). Pin 2 is the "*" terminal, intended to float or connect to Anode in high-EMI environments per TI design guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Common reference node; typically tied to system ground or low-impedance return path for stable shunt operation. |
| Pin 3 | Cathode | Current-sink input; connects to regulated supply rail via series resistor to establish precise 2.5V drop across device. |
| Pins 4 & 5 | No Internal Connection | Unused; must remain unconnected - no routing or soldering required on PCB layout. |
| Pin 2 (*) | Control Terminal | Must float or tie to Anode (Pin 1); mitigates EMI-induced voltage shift near transformers or switching regulators. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor stability | Operates reliably with any capacitive load - eliminates BOM cost and board area for output bypass caps in compact modules. |
| Ultra-low quiescent current | 45μA minimum cathode current enables use in always-on IoT sensors powered by coin cells or energy harvesters. |
| Low-noise Zener architecture | 35μVRMS integrated noise preserves SNR in high-resolution analog signal chains without external filtering. |
| Wide operating current range | Stable regulation from 45μA to 15mA - accommodates both micropower standby and active measurement modes in same design. |
| EMI-immune pin configuration | Dedicated * pin (Pin 2) provides controlled anode coupling path - reduces sensitivity to radiated noise in motor drives and PLC I/O cards. |
Applications
| Industrial Data-Acquisition Systems | Field Transmitters |
|---|---|
Use Scenario: High-accuracy 16-bit SAR ADC front-end in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for ADC VREF input and sensor excitation circuitry. Use Value: Enables ±0.2% system gain accuracy without recalibration across –40°C to 85°C ambient, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: 4–20mA loop-powered pressure transmitter with HART digital overlay. IC Role / Device Role / Timing Role: Supplies precision bias for bridge amplifier and ADC reference in <4mA total loop budget. Use Value: Delivers 2.5V reference at 45μA min current - allowing full functionality within strict 3.5mA loop headroom at lowest supply voltage. |
| Energy Infrastructure Meters | Automotive Cabin Sensors |
Use Scenario: Polyphase electricity meter with metrology-grade AFE and isolation barrier. IC Role / Device Role / Timing Role: References isolated sigma-delta ADCs measuring voltage/current channels. Use Value: 0.08% thermal hysteresis prevents offset drift during daily thermal cycling in outdoor meter enclosures. |
Use Scenario: Occupancy and air quality sensor cluster in vehicle HVAC control unit. IC Role / Device Role / Timing Role: Stabilizes bias for NDIR CO₂ and VOC sensor amplifiers in low-power wake-on-event mode. Use Value: 35μVRMS noise floor avoids false triggers in ppm-level gas detection algorithms running on 32-bit MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C25IDCKR | ±0.5% initial accuracy, same 100ppm/°C tempco and SC-70-5 package | Acceptable where system calibration compensates for initial error; lower cost for non-critical biasing | Select when BOM cost reduction outweighs need for tighter initial tolerance in production test flow. |
| REF3025AIDBZR | Series topology, 2.5V output, ±0.2% accuracy, 50ppm/°C tempco, SOT-23-3 package | Requires input headroom >2.7V; not a drop-in replacement due to different topology and pinout | Choose only if higher PSRR and lower noise (20μVRMS) justify redesigning bias network and layout. |
Compared with LM4040C25IDCKR, the LM4040B25IDCKR delivers 0.3% tighter initial tolerance without layout change; versus REF3025AIDBZR, it retains shunt simplicity and zero-headroom operation but trades 15ppm/°C lower tempco for SC-70 footprint compatibility.
Availability
LM4040B25IDCKR is available at Aetrix Electronics and suitable for industrial data-acquisition systems, field transmitters, and energy infrastructure meters requiring stable component supply across extended product lifecycles.
Supply support for LM4040B25IDCKR 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 family targets cost-sensitive, space-constrained applications demanding micropower operation and uncompromised DC accuracy - especially in industrial sensing, metering, and portable instrumentation.
FAQ
What is the operating temperature range for LM4040B25IDCKR?
The LM4040B25IDCKR is characterized for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in factory automation controllers, outdoor utility meters, and automotive cabin electronics without derating. The device maintains its ±0.2% initial accuracy and 100ppm/°C temperature coefficient across this full span, as verified in TI's LM4040B25I electrical characteristics tables.
Does LM4040B25IDCKR require an output capacitor?
No, LM4040B25IDCKR is stable with all capacitive loads and requires no output capacitor for proper operation. Its internal design eliminates oscillation risk even when directly driving ADC reference inputs or op-amp bias networks with up to several nanofarads of capacitance - simplifying layout and reducing BOM count in space-constrained designs.
What is the purpose of Pin 2 (*) on LM4040B25IDCKR?
Pin 2 (*) on LM4040B25IDCKR is a dedicated control terminal intended to float or be connected to the Anode (Pin 1). TI specifies this connection in high-EMI environments - such as near switching power supplies or motor drivers - to reduce noise-induced voltage shifts. It is not a functional signal pin and carries no current under normal operation.
How does LM4040B25IDCKR compare to LM4040A25IDCKR?
LM4040B25IDCKR offers ±0.2% initial accuracy versus ±0.1% for LM4040A25IDCKR, with identical 100ppm/°C temperature coefficient, 35μVRMS noise, and SC-70-5 packaging. The B-grade provides optimal cost-performance balance for applications where system-level calibration absorbs the 0.1% additional tolerance, while maintaining full compatibility in layout and schematic.
Can LM4040B25IDCKR be used in battery-powered devices?
Yes, LM4040B25IDCKR is optimized for micropower operation with a typical minimum cathode current of 45μA - enabling reliable 2.5V reference generation in coin-cell-powered sensors, wireless transmitters, and energy-harvesting nodes. Its stable regulation down to this current level supports ultra-low-power sleep modes without reference dropout or recovery delay.
LM4040B25IDCKR 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:
- ±0.2%
- 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
LM4040B25IDCKR FAQ
1.How can I place an order for LM4040B25IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B25IDCKR 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 LM4040B25IDCKR reliable?
The price and inventory of LM4040B25IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B25IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040B25IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B25IDCKR transactions.
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4.How is shipping managed for LM4040B25IDCKR?
LM4040B25IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B25IDCKR 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 LM4040B25IDCKR?
For technical support, including LM4040B25IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B25IDCKR requirements.
6.How does Aetrix verify that LM4040B25IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040B25IDCKR 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 LM4040B25IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040B25IDCKR?
All LM4040B25IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B25IDCKR, 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 LM4040B25IDCKR part is unused and in its original packaging.
Return procedure for LM4040B25IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040B25IDCKR Tags
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