My Inquiry
My Account
Texas Instruments LM4040C25IDCKR
- Part No.:
- LM4040C25IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040C25IDCKR.pdf
- Description:
- IC VREF SHUNT 0.5% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,256
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040C25IDCKR from Texas Instruments is a precision micropower shunt voltage reference with a fixed 2.5V output, ±0.5% initial accuracy (C grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, low-drift reference in analog input modules and portable data-acquisition systems.
For engineers reviewing the LM4040C25IDCKR datasheet, LM4040C25IDCKR pinout, LM4040C25IDCKR application, or LM4040C25IDCKR equivalent, this page delivers verified specifications, SC-70 package details, thermal hysteresis (0.08%), dynamic impedance (0.9Ω typ), and real-world use cases in energy infrastructure and automotive electronics.
Technical Context
The LM4040C25IDCKR 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 silicon design achieves ±0.5% tolerance at 25°C and sustains stability over –40°C to 85°C (I-grade) with no external capacitor required.
It features low dynamic impedance (0.9Ω typ at 1mA), minimal thermal hysteresis (0.08%), and long-term stability of 120ppm after 1000 hours. The device draws only 45μA minimum cathode current, enabling use in battery-powered instrumentation where quiescent power is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal; tightly regulated reverse breakdown voltage for ADC/DAC biasing and sensor excitation |
| Initial Accuracy | ±0.5% max at 25°C; defines absolute voltage error before temperature or load variation |
| Temp Coefficient | 100ppm/°C max; ensures ≤±0.025V drift over –40°C to 85°C operating range |
| Wideband Noise | 35μVRMS (10Hz–10kHz); low enough to avoid degrading 16-bit+ data converter performance |
| Min Cathode Current | 45μA typical; enables ultra-low-power operation in always-on monitoring circuits |
| Dynamic Impedance | 0.9Ω typical at 1mA; maintains output regulation under fast load transients |
| Thermal Hysteresis | 0.08%; limits residual voltage shift after thermal cycling between –40°C and 125°C |
Pinout & Package
LM4040C25IDCKR is packaged in a 5-pin SC-70 (DCK) outline measuring 2.00mm × 1.25mm, optimized for space-constrained PCB layouts. The package includes two no-connect (NC) pins and three functional terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current/voltage input | Sinks cathode current (IZ) to establish 2.5V reference; connects to supply rail via series resistor |
| Anode (Pin 1) | Common ground reference | Typically tied to system ground; forms return path for cathode current |
| NC (Pins 4, 5) | No internal connection | Must be left unconnected; no electrical function or internal tie |
| Pin 2 (Anode Adjacent) | Must float or connect to anode | Used only in high-EMI environments; ties to anode to suppress noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor-reduces BOM count and layout sensitivity |
| Low 35μVRMS noise | Preserves signal integrity in precision 16-bit+ SAR and delta-sigma ADC applications |
| 45μA min cathode current | Enables operation from microamp-level bias sources, e.g., in IoT sensor nodes |
| 0.08% thermal hysteresis | Minimizes calibration drift after field temperature cycling in industrial control systems |
| SC-70 footprint | Reduces board area by >50% vs. SOT-23; supports high-density mixed-signal PCBs |
Applications
| Energy Infrastructure Monitoring | Analog Input Module |
|---|---|
Use Scenario: High-accuracy voltage scaling in smart meter front-ends and grid-edge sensors. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5V reference for 24-bit sigma-delta ADCs measuring AC line voltage. Use Value: ±0.5% initial accuracy and 100ppm/°C TC ensure <0.1% total error over utility-grade temperature ranges (–25°C to 70°C). |
Use Scenario: Modular PLC I/O card requiring calibrated analog inputs for 4–20mA loop receivers. IC Role / Device Role / Timing Role: Precision voltage reference for op-amp gain-setting and ADC reference in multi-channel input stages. Use Value: Low 35μVRMS noise prevents SNR degradation; SC-70 size allows dense channel packing without sacrificing accuracy. |
| Field Transmitter Calibration | Automotive Cabin Sensors |
Use Scenario: Two-wire 4–20mA pressure/temperature transmitters deployed in oil & gas refineries. IC Role / Device Role / Timing Role: Primary shunt reference setting excitation voltage for bridge sensors and ADC reference. Use Value: Stable operation from 45μA enables compliance with loop-powered constraints while maintaining ±0.5% accuracy over –40°C to 85°C. |
Use Scenario: Occupancy and air quality sensors in automotive cabin control units. IC Role / Device Role / Timing Role: Reference source for low-power microcontroller ADCs sampling CO₂, humidity, and VOC sensors. Use Value: Micropower operation extends battery life in backup-sensing modes; thermal hysteresis <0.08% prevents recalibration drift after thermal shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C25QDBZR | Same 2.5V output, ±0.5% accuracy, but rated for –40°C to 125°C (Q-grade); higher 150ppm/°C TC | Better suited for under-hood automotive use; less stable over wide temperature swings than LM4040C25IDCKR | Select when extended temperature range is mandatory and 150ppm/°C TC is acceptable |
| REF3025AIDBZR | Series reference (not shunt); 2.5V, ±0.2% accuracy, 50ppm/°C TC; requires ≥100μA supply current | Needs external supply rail; incompatible with shunt-based loop-powered designs | Choose only for new designs where series topology and tighter accuracy justify added complexity |
Compared with TL4050C25QDBZR and REF3025AIDBZR, LM4040C25IDCKR offers superior temperature stability (100ppm/°C vs. 150ppm/°C) and true shunt operation-enabling direct integration into 4–20mA loops without additional bias circuitry-while maintaining the smallest footprint (SC-70) among the three.
Availability
LM4040C25IDCKR is available at Aetrix Electronics and suitable for energy infrastructure monitoring, analog input modules, and field transmitter calibration requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for LM4040C25IDCKR 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 high DC accuracy-targeting industrial process control, portable instrumentation, and automotive sensing subsystems.
FAQ
What is the operating temperature range for LM4040C25IDCKR?
The LM4040C25IDCKR is characterized for operation over an ambient temperature range of –40°C to +85°C (industrial grade). Its electrical specifications-including ±0.5% initial accuracy and 100ppm/°C temperature coefficient-are guaranteed across this full range, making it suitable for deployment in harsh industrial environments where thermal stability is critical. LM4040C25IDCKR does not support the extended –40°C to +125°C range.
Does LM4040C25IDCKR require an output capacitor?
No, LM4040C25IDCKR is inherently stable with all capacitive loads and requires no external output capacitor for proper operation. This eliminates a common BOM item and simplifies layout-especially beneficial in space-constrained applications like handheld test equipment or modular I/O cards where LM4040C25IDCKR serves as the ADC reference.
How does the 0.08% thermal hysteresis specification impact system calibration?
The 0.08% thermal hysteresis of LM4040C25IDCKR means that after cycling between –40°C and +125°C, the output voltage shift measured at 25°C is ≤0.08% of 2.5V (≤2mV). This low hysteresis minimizes recalibration needs in field-deployed equipment such as smart meters or remote sensors where LM4040C25IDCKR provides the primary voltage reference.
Can LM4040C25IDCKR be used in 4–20mA loop-powered transmitters?
Yes, LM4040C25IDCKR is ideal for 4–20mA loop-powered transmitters due to its 45μA typical minimum cathode current requirement. It sinks current directly from the loop, eliminating the need for a separate supply rail. In such applications, LM4040C25IDCKR establishes a stable 2.5V reference for sensor excitation and ADC conversion without compromising loop compliance voltage.
What is the dynamic impedance of LM4040C25IDCKR and why does it matter?
LM4040C25IDCKR has a typical reverse dynamic impedance of 0.9Ω at 1mA cathode current. This low value ensures minimal output voltage deviation during rapid load changes-critical when driving switched-capacitor circuits or multiplexed ADC references. For example, a 1mA transient load step causes only ~0.9mV droop, preserving measurement fidelity in high-speed data acquisition systems using LM4040C25IDCKR.
LM4040C25IDCKR 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:
- ±0.5%
- 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:
- SC-70-5
LM4040C25IDCKR FAQ
1.How can I place an order for LM4040C25IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C25IDCKR 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 LM4040C25IDCKR reliable?
The price and inventory of LM4040C25IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040C25IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C25IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C25IDCKR?
LM4040C25IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C25IDCKR 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 LM4040C25IDCKR?
For technical support, including LM4040C25IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25IDCKR requirements.
6.How does Aetrix verify that LM4040C25IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040C25IDCKR 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 LM4040C25IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040C25IDCKR?
All LM4040C25IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25IDCKR, 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 LM4040C25IDCKR part is unused and in its original packaging.
Return procedure for LM4040C25IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C25IDCKR Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
