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Analog Devices Inc./Maxim Integrated LM4040BIM3-2.5
- Part No.:
- LM4040BIM3-2.5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040BIM3-2.5.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:44,462
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Product details
Overview
LM4040BIM3-2.5 from Texas Instruments (formerly National Semiconductor) is a precision micropower shunt voltage reference in SOT-23 package, delivering a stable 2.500 V reverse breakdown voltage with ±0.2% initial tolerance at 25°C, 100 ppm/°C max temperature coefficient, and 35 μVrms wideband noise (10 Hz–10 kHz). It operates from 60 μA to 15 mA over −40°C to +85°C and requires no output capacitor.
For engineers reviewing the LM4040BIM3-2.5 datasheet, LM4040BIM3-2.5 pinout, LM4040BIM3-2.5 application, or LM4040BIM3-2.5 equivalent, key selection criteria include industrial-grade accuracy, low quiescent current, capacitive-load stability, and compatibility with space-constrained analog front-ends in battery-powered instrumentation and data acquisition systems.
Technical Context
The LM4040BIM3-2.5 uses zener-zap trimming during wafer sort to achieve ±0.2% initial accuracy and incorporates bandgap-derived temperature drift curvature correction for stable performance across temperature and load current variations. Its low dynamic impedance (0.8 Ω max at 1 mA) ensures minimal output voltage shift under dynamic load conditions.
Unlike traditional shunt references requiring external stabilization, the LM4040BIM3-2.5 maintains stability with any capacitive load-including zero capacitance-due to its internally compensated architecture. It supports operation down to 60 μA minimum current, enabling ultra-low-power sensor biasing and precision ADC reference applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V nominal at 100 μA; enables accurate 2.5 V system reference without calibration. |
| Initial Tolerance | ±0.2% (max) at 25°C; corresponds to ±5.0 mV absolute error for robust 12-bit+ measurement systems. |
| Temp Coefficient | 100 ppm/°C (max); contributes ≤±8.5 mV drift over −40°C to +85°C ambient range. |
| Operating Current | 60 μA to 15 mA; supports microamp-level sensor excitation and milliamp-level DAC/ADC reference buffering. |
| Output Noise | 35 μVrms (10 Hz–10 kHz); suitable for 16-bit SAR ADCs without additional filtering. |
| Dynamic Impedance | 0.8 Ω (max) at 1 mA; limits voltage deviation to <8 mV under 10 mA step load changes. |
| Long-Term Stability | 120 ppm (1000 hrs); ensures <±0.3 mV drift over 1 year in uncalibrated field deployments. |
Pinout & Package
SOT-23 package (JEDEC TO-236AB, NS package MF03A), 3-pin surface-mount device with cathode-anode-no-connect configuration. Pin 1 is anode, Pin 2 is cathode, Pin 3 is no-connect (must be left floating or tied to Pin 2 per datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to system ground; forms current sink path when cathode is biased above 2.5 V. |
| Pin 2 | Cathode | Reference output node; supplies stable 2.5 V to load when reverse-biased via series resistor. |
| Pin 3 | No-connect | Internally unconnected; must remain floating or tied to Pin 2 to avoid parametric shift. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables direct connection to high-capacitance loads (e.g., ADC sample capacitors) without oscillation risk. |
| Sub-miniature SOT-23 package | 1.3 mm × 2.9 mm footprint saves >70% board area vs. TO-92; ideal for portable medical sensors. |
| Stable with any capacitive load | Eliminates need for layout-dependent RC snubbers or isolation resistors in mixed-signal PCBs. |
| Low 60 μA minimum operating current | Supports 10-year coin-cell operation in wireless sensor nodes using duty-cycled 2.5 V biasing. |
| 100 ppm/°C tempco (max) | Meets Class I industrial accuracy requirements without software compensation in PLC analog inputs. |
Applications
| Portable Medical Sensors | Data Acquisition Front-Ends |
|---|---|
Use Scenario: Battery-powered ECG electrode amplifier requiring stable 2.5 V common-mode bias. IC Role / Device Role / Timing Role: Shunt reference providing precision DC bias voltage for op-amp input stage. Use Value: 35 μVrms noise and 100 ppm/°C tempco ensure baseline stability within ±0.5 mV over full operating temperature range. |
Use Scenario: 16-bit SAR ADC reference in industrial process monitoring module. IC Role / Device Role / Timing Role: Low-drift voltage reference source for ADC conversion accuracy. Use Value: ±0.2% initial tolerance and 0.8 Ω dynamic impedance limit INL error to <±0.5 LSB at 25°C. |
| Energy Metering IC Biasing | Automotive Cabin Sensor Calibration |
Use Scenario: Reference for metrology-grade current-sense amplifier in smart electricity meter. IC Role / Device Role / Timing Role: Precision shunt reference establishing gain-setting voltage for isolated delta-sigma modulator. Use Value: 120 ppm long-term stability ensures <±0.3 mV drift over 10-year field life, meeting IEC 62053-21 Class 0.2 accuracy. |
Use Scenario: Temperature-compensated reference for cabin humidity sensor signal conditioning. IC Role / Device Role / Timing Role: Stable 2.5 V reference for ratiometric bridge excitation and ADC reference. Use Value: Operation from −40°C to +85°C with <±8.5 mV total drift enables AEC-Q200-compliant designs without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040AIM3-2.5 | ±0.1% initial tolerance (vs. ±0.2%), same 100 ppm/°C tempco and SOT-23 package. | Required where 12-bit+ absolute accuracy is mandatory without post-calibration. | Select when tighter initial accuracy justifies higher cost; identical pinout and layout. |
| TLVH431ACDBVR | Adjustable 1.24–18 V output; 0.5% initial tolerance; 120 ppm/°C tempco; 80 μA min current. | Used where programmable reference or higher voltage (>2.5 V) is needed; not drop-in compatible. | Choose for flexible voltage scaling or cost-sensitive designs accepting wider tolerance and higher min current. |
Compared with LM4040AIM3-2.5, the LM4040BIM3-2.5 trades 0.1% initial accuracy for lower unit cost while retaining identical thermal and noise performance; versus TLVH431ACDBVR, it offers superior accuracy and lower noise but lacks adjustability and requires fixed 2.5 V use cases.
Availability
LM4040BIM3-2.5 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, and energy metering applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM4040BIM3-2.5 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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for the LM4040 family. TI is a global semiconductor leader focused on analog and embedded processing solutions.
The LM4040 product line was designed specifically for high-accuracy, low-power shunt reference applications in space-constrained and battery-operated systems, emphasizing micropower operation, capacitive-load immunity, and industrial temperature reliability.
FAQ
What is the maximum operating current for LM4040BIM3-2.5?
The LM4040BIM3-2.5 supports a maximum operating current of 15 mA. This allows it to drive moderate loads such as ADC reference inputs or op-amp bias networks without external buffering. Exceeding 15 mA risks exceeding the 306 mW power dissipation limit in the SOT-23 package and may cause thermal shutdown or parametric shift. Always verify junction temperature rise under worst-case ambient and current conditions.
Can LM4040BIM3-2.5 be used without an output capacitor?
Yes, the LM4040BIM3-2.5 is explicitly designed to operate stably without any output capacitor - a key differentiator from legacy shunt references. Its internal compensation ensures stability with zero, low, or high capacitive loads (e.g., 10 nF–10 μF), eliminating layout sensitivity and simplifying design for ADC sampling circuits, sensor interfaces, and portable equipment where board space is constrained.
What is the minimum operating current for LM4040BIM3-2.5?
The LM4040BIM3-2.5 has a guaranteed maximum minimum operating current of 60 μA across the industrial temperature range (−40°C to +85°C). At 100 μA, it achieves full specified accuracy; operation below 60 μA may result in degraded regulation and increased output impedance. For ultra-low-power wake-up circuits, pairing with a high-value series resistor ensures reliable start-up while maintaining sub-100 μA average current draw.
Does LM4040BIM3-2.5 support extended temperature range operation?
No - the LM4040BIM3-2.5 is rated only for the industrial temperature range (−40°C to +85°C). For operation up to +125°C, TI offers the LM4040CEM3-2.5 (±0.5%, C grade) or LM4040DEM3-2.5 (±1.0%, D grade) in the same SOT-23 package. These variants undergo extended-range qualification testing and specify parameters over −40°C to +125°C, including tempco and long-term stability.
How does the no-connect pin (Pin 3) affect LM4040BIM3-2.5 functionality?
Pin 3 of the LM4040BIM3-2.5 is an internally unconnected terminal. The datasheet mandates that it be left floating or tied directly to Pin 2 (cathode); connecting it to any other net - especially ground or supply - can alter reverse breakdown characteristics and degrade accuracy or stability. This requirement is critical for achieving the specified ±0.2% tolerance and low noise performance in production assemblies.
LM4040BIM3-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- 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
LM4040BIM3-2.5 FAQ
1.How can I place an order for LM4040BIM3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BIM3-2.5 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 LM4040BIM3-2.5 reliable?
The price and inventory of LM4040BIM3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BIM3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040BIM3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BIM3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BIM3-2.5?
LM4040BIM3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BIM3-2.5 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 LM4040BIM3-2.5?
For technical support, including LM4040BIM3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BIM3-2.5 requirements.
6.How does Aetrix verify that LM4040BIM3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040BIM3-2.5 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 LM4040BIM3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040BIM3-2.5?
All LM4040BIM3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BIM3-2.5, 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 LM4040BIM3-2.5 part is unused and in its original packaging.
Return procedure for LM4040BIM3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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