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Texas Instruments LM4040CIM3-4.1
- Part No.:
- LM4040CIM3-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CIM3-4.1.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,848
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Product details
Overview
LM4040CIM3-4.1 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a stable 4.096 V reverse breakdown voltage with ±0.5% initial tolerance (C-grade) at 25°C, 68 μA minimum operating current, and 100 ppm/°C max temperature coefficient - used for ADC/DAC biasing, sensor excitation, and portable instrumentation power rails.
For engineers reviewing the LM4040CIM3-4.1 datasheet, LM4040CIM3-4.1 pinout, LM4040CIM3-4.1 application, or LM4040CIM3-4.1 equivalent, this page delivers verified electrical specs, thermal behavior, industrial-grade (-40°C to +85°C) operation, and real-world design implications - not generic voltage reference claims.
Technical Context
The LM4040CIM3-4.1 uses Zener-zap trimmed bandgap architecture with curvature-corrected temperature drift compensation, enabling stable 4.096 V output across -40°C to +85°C without external capacitors. Its low dynamic impedance (≤0.9 Ω at 1 mA) and wide 68 μA–15 mA operating current range support direct connection to varying load conditions.
It operates as a two-terminal shunt device: cathode supplies regulated voltage while anode connects to ground; no third terminal is active. The SOT-23-3 package integrates NC (pin 3) that must be left floating or tied to anode - not used for regulation or sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal reverse breakdown voltage - sets precise reference for 12-bit ADCs and 4.096-V full-scale systems. |
| Initial Tolerance | ±0.5% at 25°C (C-grade) - translates to ±20.5 mV absolute error, enabling calibration-free designs in mid-accuracy applications. |
| Temp Coefficient | Max 100 ppm/°C over -40°C to +85°C - contributes ≤±6.5 mV drift across industrial temperature range. |
| Min Operating Current | 68 μA at 25°C - allows ultra-low-power operation in battery-backed sensors and energy-harvesting circuits. |
| Dynamic Impedance | ≤0.9 Ω at 1 mA - ensures <1 mV output shift under 1 mA load transients, critical for noise-sensitive analog front-ends. |
| Wideband Noise | 35 μVRMS (10 Hz–10 kHz) - supports high-resolution data acquisition without added filtering. |
| Long-Term Stability | 120 ppm after 1000 hours - predicts <0.012% output drift over first year of continuous operation. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, 0.95 mm height, gull-wing leads; RoHS-compliant, Pb-free, rated for 260°C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / regulated output node | Connects to supply rail; sinks current to maintain 4.096 V at this node - functions as voltage-sensing and current-sinking terminal. |
| Anode (Pin 2) | Reference ground return | Must be connected to system ground; forms the reference potential for cathode voltage - no internal isolation from substrate. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must be left floating or tied to Pin 2 (anode); not usable for feedback, trimming, or thermal sensing. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation with zero external capacitance - eliminates BOM cost, board space, and startup delay in space-constrained designs. |
| Tolerates capacitive loads | Remains stable driving up to 10 nF directly - enables direct buffering of ADC reference inputs without series resistance. |
| Micropower operation | 68 μA minimum current enables >10-year battery life in coin-cell-powered IoT nodes at 3 V supply. |
| Industrial temperature range | Specified performance from -40°C to +85°C - validated for use in outdoor metering, factory automation, and automotive cabin modules. |
| Low thermal hysteresis | 0.08% voltage shift after -40°C ↔ +125°C cycling - ensures repeatable accuracy in thermally cycled environments like engine bay sensors. |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and lithium coin-cell power source. IC Role / Device Role / Timing Role: Shunt reference providing 4.096 V full-scale reference to ADC, replacing bulkier three-terminal references. Use Value: Enables 12-bit effective resolution with <1 LSB drift over temperature and <0.1% total error budget - no calibration needed per unit. |
Use Scenario: Industrial PLC analog input module measuring 4–20 mA loop signals. IC Role / Device Role / Timing Role: Precision reference for 24-bit delta-sigma ADC, powering internal DACs and gain stages. Use Value: Delivers 0.005% linearity contribution and supports 100 kSPS sampling without reference droop during conversion bursts. |
| Energy Monitoring | Automotive Cabin Sensors |
Use Scenario: Smart electricity meter with isolated current/voltage sensing and metrology SoC. IC Role / Device Role / Timing Role: Primary voltage reference for metrology ADC, sharing ground with isolated power domain. Use Value: Maintains ±0.02% accuracy over 10-year field life and withstands 1000+ thermal cycles - meets IEC 62053-21 Class 0.2 requirements. |
Use Scenario: Occupancy sensor with MEMS accelerometer and low-power MCU in vehicle dashboard. IC Role / Device Role / Timing Role: Reference for onboard temperature-compensated analog signal conditioning chain. Use Value: Provides stable 4.096 V despite 85°C ambient and 15°C/min thermal ramp rates - eliminates cold-junction drift in thermistor networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C41IDBZR | Same 4.096 V output, ±0.5% tolerance, but higher 75 μA min current and 120 ppm/°C tempco. | Less suitable for sub-100 μA battery systems; better for high-temp automotive under-hood use (−40°C to +125°C). | Select TL4050C41IDBZR only when extended temperature range or AEC-Q200 qualification is mandatory. |
| MAX6008AEUR+T | 4.096 V output, ±0.2% initial tolerance (A-grade), 60 μA min current, but SC70-3 package (smaller footprint, higher thermal resistance). | Better accuracy for calibration-critical systems; less robust thermal performance in high-power-density layouts. | Choose MAX6008AEUR+T when ±0.2% tolerance is required and board area is constrained - verify thermal derating at 15 mA. |
Compared with LM4040CIM3-4.1, TL4050C41IDBZR trades lower quiescent current for wider temperature range, while MAX6008AEUR+T improves initial accuracy at the cost of thermal margin and package availability - LM4040CIM3-4.1 remains optimal for cost-sensitive industrial instrumentation with standard industrial temp requirements.
Availability
LM4040CIM3-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and energy monitoring applications requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LM4040CIM3-4.1 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, embedded processing, and power management ICs, with decades of expertise in precision reference design and high-volume manufacturing reliability.
The LM4040-N product line delivers micropower shunt references optimized for space-constrained, battery-operated, and industrial measurement systems - designed to replace larger, capacitor-dependent references with minimal layout impact.
FAQ
What is the exact output voltage and tolerance of LM4040CIM3-4.1 at 25°C?
The LM4040CIM3-4.1 has a nominal reverse breakdown voltage of 4.096 V with ±0.5% initial tolerance at 25°C, corresponding to ±20.5 mV absolute deviation. This is confirmed in Section 6.14 of the TI SNOS633K datasheet for C-grade devices in the industrial temperature grade (I).
Does LM4040CIM3-4.1 require an external capacitor for stability?
No - the LM4040CIM3-4.1 is internally compensated and requires no output capacitor for stability, even with capacitive loads up to 10 nF. This is explicitly stated in the Features section and validated in Figure 12 of the SNOS633K datasheet.
What is the minimum operating current for LM4040CIM3-4.1 across temperature?
The LM4040CIM3-4.1 requires a minimum operating current of 68 μA at 25°C, increasing to 70 μA over the full −40°C to +85°C industrial range. This value is specified in Table 6.14 (Electrical Characteristics: 4.1-V LM4040-N VR, C-grade, I-temp).
Can LM4040CIM3-4.1 be used in automotive applications?
The LM4040CIM3-4.1 is rated for industrial temperature (−40°C to +85°C) and is not AEC-Q200 qualified. For automotive cabin applications within this range, it may be used at the designer's risk; however, TI's LM4040QAIM3-4.1 (Q1 grade) is the qualified alternative with same electrical specs and AEC-Q200 Grade 3 certification.
What is the thermal hysteresis specification for LM4040CIM3-4.1?
The LM4040CIM3-4.1 exhibits 0.08% thermal hysteresis - defined as the voltage difference measured at 25°C after cycling between −40°C and +125°C. This value is consistent across all LM4040-N variants and appears in Tables 6.5–6.7 of the SNOS633K datasheet.
LM4040CIM3-4.1 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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 73 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CIM3-4.1 FAQ
1.How can I place an order for LM4040CIM3-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIM3-4.1 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 LM4040CIM3-4.1 reliable?
The price and inventory of LM4040CIM3-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIM3-4.1 is usually 5 days.
3.What payment methods are accepted for LM4040CIM3-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIM3-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIM3-4.1?
LM4040CIM3-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIM3-4.1 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 LM4040CIM3-4.1?
For technical support, including LM4040CIM3-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIM3-4.1 requirements.
6.How does Aetrix verify that LM4040CIM3-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4040CIM3-4.1 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 LM4040CIM3-4.1 meets industry standards.
7.What is the process for return or replacement of LM4040CIM3-4.1?
All LM4040CIM3-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIM3-4.1, 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 LM4040CIM3-4.1 part is unused and in its original packaging.
Return procedure for LM4040CIM3-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIM3-4.1 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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