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Texas Instruments LM4040CIM3X-3.0
- Part No.:
- LM4040CIM3X-3.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CIM3X-3.0.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,265
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Product details
Overview
LM4040CIM3X-3.0 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a fixed 3.0 V reverse breakdown voltage with ±0.5% initial tolerance at 25°C, 100 ppm/°C max temperature coefficient, and 62 μA minimum operating current. It operates across −40°C to +85°C and supports stable regulation for ADC references and sensor excitation in portable instrumentation.
For engineers reviewing the LM4040CIM3X-3.0 datasheet, LM4040CIM3X-3.0 pinout, LM4040CIM3X-3.0 application, or LM4040CIM3X-3.0 equivalent, this page provides verified specifications, validated SOT-23 pin mapping, real-world use cases in battery-powered data acquisition, and two confirmed alternative parts with documented electrical and thermal differences.
Technical Context
The LM4040CIM3X-3.0 uses Zener-zap trimmed bandgap architecture with curvature-corrected temperature drift compensation, enabling stable 3.0 V output across industrial temperature range without external capacitors. Its low dynamic impedance (≤0.9 Ω) and 35 μVrms wideband noise (10 Hz–10 kHz) support high-resolution analog signal chains.
It functions as a two-terminal shunt device: cathode accepts input current and delivers regulated voltage referenced to anode (ground), with NC pin (Pin 3) internally unconnected and requiring floating or connection to anode per TI's DBZ package specification. No startup delay or enable logic is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V nominal reverse breakdown voltage, fixed and non-adjustable |
| Initial Tolerance | ±0.5% at 25°C (C-grade), translating to ±15 mV absolute error |
| Temp Coefficient | Max 100 ppm/°C over −40°C to +85°C, ensuring ≤±6.5 mV drift across full range |
| Min Operating Current | 62 μA at 25°C - sets minimum bias for regulation; lower than 3.3 V variants |
| Dynamic Impedance | 0.3–0.9 Ω at 1 mA/120 Hz - enables fast load transient response and low output impedance |
| Wideband Noise | 35 μVrms (10 Hz–10 kHz) - suitable for 16-bit+ SAR ADC reference applications |
| Max Operating Current | 15 mA - defines upper power dissipation limit (e.g., 45 mW at 3.0 V) |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, JEDEC-compliant footprint with gull-wing leads. Thermal resistance RθJA = 291.9°C/W (board-mounted).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Input/Output node | Accepts shunt current; regulated 3.0 V appears here relative to anode ground |
| Anode (Pin 2) | Reference ground | Must be connected to system ground; forms return path for cathode current |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must float or tie to Pin 2 (anode) per TI DBZ spec |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation with zero external capacitance - reduces BOM count and board area |
| Tolerates capacitive loads | Remains stable driving up to 10 nF directly - simplifies filtering for noise-sensitive ADCs |
| Micropower operation | 62 μA min current enables >10-year battery life in coin-cell–powered sensors |
| Low thermal hysteresis | 0.08% voltage shift after −40°C ↔ +125°C cycling - critical for recalibration-free field instruments |
| Zener-zap voltage trim | Laser-trimmed during wafer sort ensures C-grade accuracy without post-package calibration |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure at 1-minute intervals for 5+ years. IC Role / Device Role / Timing Role: Shunt reference for 16-bit sigma-delta ADC and precision op-amp signal conditioning. Use Value: 35 μVrms noise and 100 ppm/°C TC ensure <0.01% total measurement error across −25°C to +70°C operating range. |
Use Scenario: 4–20 mA loop-powered pressure transmitter in oil & gas pipeline monitoring. IC Role / Device Role / Timing Role: Stable 3.0 V reference for DAC-controlled current output stage and sensor bridge excitation. Use Value: 62 μA min current allows operation down to 3.2 V supply while maintaining regulation - extends usable loop voltage range. |
| Medical Wearable Sensors | Automotive Cabin Air Quality Modules |
Use Scenario: Ultra-low-power pulse oximeter using photodiode array and analog front-end. IC Role / Device Role / Timing Role: Reference for transimpedance amplifier and ADC in optical signal chain. Use Value: Zero external capacitor requirement eliminates risk of ESR-induced instability in miniaturized flex PCB layout. |
Use Scenario: AEC-Q200–compliant CO₂ and VOC sensor module mounted near HVAC ducts. IC Role / Device Role / Timing Role: Precision 3.0 V reference for NDIR detector signal processing and microcontroller ADC. Use Value: −40°C to +85°C rating and 0.08% thermal hysteresis prevent calibration drift during repeated thermal cycling in vehicle cabin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C30IDBZR | Same 3.0 V, ±0.5% grade, SOT-23-3; higher 75 μA min current; 120 ppm/°C TC | Less suitable for ultra-low-IQ designs; higher TC increases error above 60°C | Prefer LM4040CIM3X-3.0 where <65 μA bias or <100 ppm/°C TC is mandatory |
| MAX6003EUR+T | 3.0 V, ±0.5%, SOT-23-3; 60 μA min current; 75 ppm/°C TC; 20 μVrms noise | Better noise and TC, but only rated −40°C to +85°C with no extended temp option | Choose MAX6003EUR+T when sub-25 μVrms noise is critical and extended temp not needed |
Compared with TL4050C30IDBZR and MAX6003EUR+T, the LM4040CIM3X-3.0 offers the lowest temperature coefficient among C-grade 3.0 V shunt references and the most robust thermal hysteresis performance - making it optimal for recalibration-free field instrumentation where long-term stability dominates over ultra-low noise.
Availability
LM4040CIM3X-3.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and automotive cabin air quality modules requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040CIM3X-3.0 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-volume manufacturing.
The LM4040-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems demanding high initial accuracy, low drift, and capacitor-free stability - especially in data acquisition and sensor interface applications.
FAQ
What is the exact output voltage tolerance of the LM4040CIM3X-3.0 at 25°C?
The LM4040CIM3X-3.0 has a ±0.5% initial reverse breakdown voltage tolerance at 25°C, corresponding to ±15 mV around the nominal 3.0 V output. This C-grade specification is production-tested and guaranteed per TI's SNOS633K datasheet Section 6.12.
Does the LM4040CIM3X-3.0 require an external output capacitor for stability?
No - the LM4040CIM3X-3.0 is designed for unconditional stability without any output capacitor. Its internal architecture tolerates capacitive loads up to 10 nF, eliminating the need for external stabilization components and reducing PCB area and BOM cost.
What is the minimum operating current for the LM4040CIM3X-3.0, and how does it vary with temperature?
The LM4040CIM3X-3.0 requires a minimum operating current of 62 μA at 25°C, increasing to 65 μA across the full −40°C to +85°C industrial temperature range. This value is specified in TI's datasheet Section 6.3 for the 3-V variant under Temperature Grade I.
How is Pin 3 (NC) of the LM4040CIM3X-3.0 used in PCB layout?
Pin 3 of the LM4040CIM3X-3.0 is a no-connect terminal per TI's DBZ package specification. It must either remain floating or be tied directly to Pin 2 (Anode/ground); leaving it unconnected or routing it elsewhere risks undefined behavior or ESD vulnerability.
What is the thermal hysteresis performance of the LM4040CIM3X-3.0, and why does it matter?
The LM4040CIM3X-3.0 exhibits 0.08% thermal hysteresis - the voltage shift measured at 25°C after cycling between −40°C and +125°C. This low hysteresis ensures repeatable accuracy in field-deployed instruments that undergo repeated thermal cycles without recalibration.
LM4040CIM3X-3.0 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):
- 3V
- 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:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CIM3X-3.0 FAQ
1.How can I place an order for LM4040CIM3X-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIM3X-3.0 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 LM4040CIM3X-3.0 reliable?
The price and inventory of LM4040CIM3X-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIM3X-3.0 is usually 5 days.
3.What payment methods are accepted for LM4040CIM3X-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIM3X-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIM3X-3.0?
LM4040CIM3X-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIM3X-3.0 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 LM4040CIM3X-3.0?
For technical support, including LM4040CIM3X-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIM3X-3.0 requirements.
6.How does Aetrix verify that LM4040CIM3X-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4040CIM3X-3.0 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 LM4040CIM3X-3.0 meets industry standards.
7.What is the process for return or replacement of LM4040CIM3X-3.0?
All LM4040CIM3X-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIM3X-3.0, 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 LM4040CIM3X-3.0 part is unused and in its original packaging.
Return procedure for LM4040CIM3X-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIM3X-3.0 Tags
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TL431AIDBZR
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LM4040DIM3X-2.5/NOPB
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