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Texas Instruments LM4040BIM3X-2.5
- Part No.:
- LM4040BIM3X-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040BIM3X-2.5.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,809
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Product details
Overview
LM4040BIM3X-2.5 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a stable 2.5 V reverse breakdown voltage with ±0.2% initial tolerance (B-grade) at 25°C, 100 ppm/°C max temperature coefficient, 35 μVrms wideband noise (10 Hz–10 kHz), and operation from 60 μA to 15 mA. It serves as a compact, capacitor-free reference for ADC/DAC biasing and sensor excitation in portable instrumentation.
For engineers reviewing the LM4040BIM3X-2.5 datasheet, LM4040BIM3X-2.5 pinout, LM4040BIM3X-2.5 application, or LM4040BIM3X-2.5 equivalent, key selection criteria include industrial temperature range (−40°C to +85°C), low dynamic impedance (0.8 Ω typical), no-output-capacitor requirement, and compatibility with capacitive loads - all critical for battery-powered data acquisition and precision analog front-ends.
Technical Context
The LM4040BIM3X-2.5 uses a Zener-zap trimmed bandgap architecture with curvature-corrected temperature drift compensation, enabling stable 2.5 V output across −40°C to +85°C. Its shunt topology requires an external current-limiting resistor and sinks load current via the cathode terminal.
It achieves 0.8 Ω typical dynamic impedance at 1 mA and maintains regulation without output capacitance, while tolerating arbitrary capacitive loads - a result of internal phase compensation eliminating need for external stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage; precise reference point for analog signal conditioning and ADC reference rails. |
| Initial Tolerance | ±0.2% at 25°C (B-grade); ensures ≤±5 mV absolute error before temperature or aging effects. |
| Temp Coefficient | ≤100 ppm/°C over −40°C to +85°C; contributes ≤±19 mV total drift across full industrial range. |
| Operating Current | 60 μA to 15 mA; supports ultra-low-power sensor nodes and high-current precision DAC references. |
| Output Noise | 35 μVrms (10 Hz–10 kHz); enables high-resolution measurements without added filtering overhead. |
| Dynamic Impedance | 0.8 Ω typical at 1 mA; minimizes load-induced voltage shift in varying current conditions. |
| Long-Term Stability | 120 ppm after 1000 hours; predictable aging behavior for systems requiring multi-year calibration integrity. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, JEDEC-standard footprint. Anode grounded, cathode supplies regulated voltage, third pin (NC) must float or connect to anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current sink / output node | Regulated 2.5 V appears here; connects to load and current-setting resistor - primary interface for reference voltage delivery. |
| Anode (Pin 2) | Reference ground terminal | Must be connected to system ground; defines the 0 V reference for the 2.5 V output - not floating. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to Pin 2 (anode) per datasheet - no signal routing or bypass function. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Eliminates BOM cost and board space for stability; simplifies layout in space-constrained portable designs. |
| Tolerates capacitive loads | Enables direct connection to ADC input caps or long traces without oscillation risk - no series resistance needed. |
| Low micropower operation | 60 μA minimum operating current allows use in always-on battery monitors and energy-harvesting systems. |
| Stable over temperature | 100 ppm/°C max TC and ±19 mV overtemperature tolerance ensure accuracy in automotive under-hood environments. |
| Zener-zap trimmed accuracy | Fuse-based wafer-level trimming achieves ±0.2% initial tolerance without post-package calibration. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Battery-powered environmental sensors logging temperature, humidity, and pressure over months on coin-cell power. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V excitation for bridge sensors and reference for 16-bit SAR ADCs. Use Value: 60 μA min current enables >5-year runtime; ±0.2% tolerance eliminates field recalibration; no capacitor saves PCB area. |
Use Scenario: 4–20 mA loop-powered transmitters in factory automation, converting RTD or strain-gauge signals. IC Role / Device Role / Timing Role: Precision 2.5 V reference for analog signal conditioning and DAC output scaling in isolated current loops. Use Value: 100 ppm/°C TC ensures <±0.1% span error over −40°C to +85°C; low noise avoids digitization dither in 24-bit ΣΔ ADCs. |
| Medical Vital Sign Monitors | Automotive Cabin Sensors |
|
Use Scenario: Portable ECG and pulse oximetry devices requiring clinical-grade analog accuracy and low power. IC Role / Device Role / Timing Role: Reference source for biopotential amplifier gain setting and ADC reference in analog front-end ASICs. Use Value: 35 μVrms noise prevents degradation of microvolt-level ECG signals; SOT-23 footprint fits tight wearable layouts. |
Use Scenario: Occupancy, CO₂, and air quality sensors mounted in vehicle dashboards and HVAC modules. IC Role / Device Role / Timing Role: Stable 2.5 V reference for NDIR gas sensor detectors and microcontroller ADCs in AEC-Q100-compliant systems. Use Value: Qualified to AEC-Q100 Grade 3 (−40°C to +85°C); Zener-zap trim ensures production consistency across automotive lots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050B25IDBZR | 2.5 V, ±0.2% initial tolerance, 75 ppm/°C max TC, 20 μVrms noise, SOT-23-3 package. | Lower noise and tighter TC; rated for −40°C to +125°C extended range. | Preferred when lower drift or wider temperature coverage is required; same footprint but higher cost. |
| REF3025AIDBZR | 2.5 V, ±0.2% initial tolerance, 50 ppm/°C max TC, 28 μVrms noise, but series topology (not shunt). | Requires output capacitor; sinks no current - incompatible with shunt-based current-source topologies. | Select only if system uses series reference architecture; not drop-in for LM4040BIM3X-2.5's shunt configuration. |
Compared with TL4050B25IDBZR and REF3025AIDBZR, the LM4040BIM3X-2.5 offers proven shunt stability with zero-output-capacitor operation and AEC-Q100 Grade 3 qualification - making it optimal for cost-sensitive, space-constrained industrial and automotive shunt reference designs where load current varies dynamically.
Availability
LM4040BIM3X-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and automotive cabin sensors requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040BIM3X-2.5 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 leadership in precision reference design.
The LM4040-N product line delivers micropower shunt references optimized for space-constrained, battery-operated, and automotive-qualified applications - emphasizing accuracy, stability, and ease of use without external components.
FAQ
What is the maximum operating current for LM4040BIM3X-2.5?
The LM4040BIM3X-2.5 supports a maximum operating current of 15 mA, as specified in the Recommended Operating Conditions table. This limit ensures thermal safety within the SOT-23 package's 306 mW power dissipation rating at 25°C ambient. Exceeding 15 mA risks exceeding junction temperature limits and degrading long-term stability.
Does LM4040BIM3X-2.5 require an external output capacitor?
No, the LM4040BIM3X-2.5 does not require an external output capacitor. Its internal compensation ensures stability with any capacitive load, including direct connection to ADC input capacitors or long PCB traces - a key advantage over many competing shunt references.
What is the temperature coefficient specification for LM4040BIM3X-2.5?
The LM4040BIM3X-2.5 has a maximum average temperature coefficient of 100 ppm/°C over the industrial temperature range (−40°C to +85°C). This translates to ≤±19 mV total voltage drift across that range, calculated as 2.5 V × 0.75% (0.1% initial + 100 ppm/°C × 65°C).
Is LM4040BIM3X-2.5 qualified for automotive applications?
Yes, the LM4040BIM3X-2.5 is AEC-Q100 Grade 3 qualified (−40°C to +85°C), as confirmed in the device information table and Electrical Characteristics section (6.8) of the TI datasheet SNOS633K. It is suitable for non-safety-critical automotive cabin and body electronics.
What is the purpose of Pin 3 (NC) on LM4040BIM3X-2.5?
Pin 3 of the LM4040BIM3X-2.5 is a no-connect terminal. Per the datasheet Pin Functions table, it must either be left floating or connected to Pin 2 (Anode). It serves no electrical function and must never be used as a signal or ground path.
LM4040BIM3X-2.5 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):
- 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:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040BIM3X-2.5 FAQ
1.How can I place an order for LM4040BIM3X-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BIM3X-2.5 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 LM4040BIM3X-2.5 reliable?
The price and inventory of LM4040BIM3X-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BIM3X-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040BIM3X-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BIM3X-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BIM3X-2.5?
LM4040BIM3X-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BIM3X-2.5 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 LM4040BIM3X-2.5?
For technical support, including LM4040BIM3X-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BIM3X-2.5 requirements.
6.How does Aetrix verify that LM4040BIM3X-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040BIM3X-2.5 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 LM4040BIM3X-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040BIM3X-2.5?
All LM4040BIM3X-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BIM3X-2.5, 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 LM4040BIM3X-2.5 part is unused and in its original packaging.
Return procedure for LM4040BIM3X-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040BIM3X-2.5 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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