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Analog Devices Inc./Maxim Integrated LM4040BIM3-2.5-T
- Part No.:
- LM4040BIM3-2.5-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040BIM3-2.5-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:17,282
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Product details
Overview
LM4040BIM3-2.5-T from Maxim Integrated is a precision 2.500V fixed-output shunt voltage reference in SC70-3 package, featuring ±0.2% initial accuracy (±4.0 mV), 100 ppm/°C max temperature coefficient, 60 µA to 15 mA operating current range, and guaranteed operation from –40°C to +85°C. It serves as a stable reference for ADC/DAC biasing, battery monitoring, and portable power management circuits.
For engineers reviewing the LM4040BIM3-2.5-T datasheet, LM4040BIM3-2.5-T pinout, LM4040BIM3-2.5-T application, or LM4040BIM3-2.5-T equivalent, key selection criteria include reverse breakdown voltage tolerance over temperature, dynamic impedance at low currents, noise performance (35 µVRMS), and compatibility with capacitive loads without external stabilization.
Technical Context
The LM4040BIM3-2.5-T uses bandgap-based shunt regulation to maintain a precise 2.500 V across its terminals under reverse bias. Its laser-trimmed internal resistor network ensures tight initial accuracy, while the BiCMOS process enables low dynamic impedance (≤0.8 Ω at 1 mA) and stable operation across wide current (60 µA–15 mA) and temperature (–40°C to +85°C) ranges.
No external capacitor is required for stability - the device remains stable with any output capacitance, including direct connection to switching regulator feedback nodes or high-speed ADC reference inputs. Its N.C. pin (Pin 3) must be left unconnected or tied to cathode (Pin 2), confirming strict two-terminal functional behavior despite the three-pin SC70 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±4.0 mV at +25°C - defines absolute reference accuracy for 12-bit ADCs requiring ≤0.1% full-scale error |
| Tempco | ≤100 ppm/°C - contributes ≤±8.5 mV drift over –40°C to +85°C, critical for industrial sensor front-ends |
| Operating Current | 60 µA to 15 mA - supports ultra-low-power IoT sensors (µA mode) and higher-current DAC references (mA mode) |
| Dynamic Impedance | ≤0.8 Ω at 1 mA - minimizes load-induced voltage shift in precision current-sense applications |
| Output Noise | 35 µVRMS (10 Hz–10 kHz) - suitable for 16-bit SAR ADCs without additional filtering |
| Long-Term Stability | 120 ppm over 1000 h - ensures calibration retention in medical or test equipment |
Pinout & Package
LM4040BIM3-2.5-T is housed in a 3-pin SC70 surface-mount package (1.8 mm × 1.8 mm), 50% smaller than SOT23. Pin 3 is no-connect and must remain unconnected or tied to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode (cathode is Pin 2) | Positive terminal of shunt reference - connects to regulated node; reverse current flows anode-to-cathode |
| Pin 2 (–) | Cathode | Negative terminal - ties to system ground or return path; voltage referenced to this node |
| Pin 3 (N.C.) | No connection | Must be left floating or shorted to Pin 2; not internally bonded - omission causes no functional impact |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8 mm × 1.8 mm area - enables placement in space-constrained wearables and hearing aids |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout risk in battery-powered systems |
| Wide shunt current range | 60 µA min ensures operation with high-value source resistors (e.g., >1 MΩ) in energy-harvesting designs |
| Guaranteed –40°C to +85°C operation | Validated across full industrial temperature range - supports automotive cabin electronics and factory automation |
Applications
| Portable Battery Monitoring | Notebook System Reference |
|---|---|
Use Scenario: Real-time cell voltage measurement in lithium-ion battery packs for smart chargers. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.500 V for ADC input scaling. Use Value: ±4.0 mV initial tolerance ensures <0.2% full-scale error in 10-bit fuel gauging circuits. | Use Scenario: Precision voltage reference for CPU core voltage monitoring in ultrabooks. IC Role / Device Role / Timing Role: Stable 2.500 V reference for analog front-end of voltage supervisor ICs. Use Value: 100 ppm/°C tempco limits drift to ±0.85 mV over operating temperature, enabling accurate margin testing. |
| Industrial Process Sensor | Medical Instrument Calibration |
Use Scenario: Reference for 4–20 mA loop transmitter conditioning circuitry in PLC I/O modules. IC Role / Device Role / Timing Role: Two-terminal shunt reference establishing precise excitation voltage for RTD bridges. Use Value: 60 µA minimum operating current allows use with high-impedance bias networks, reducing self-heating errors. | Use Scenario: On-board calibration reference for portable ECG amplifier gain stages. IC Role / Device Role / Timing Role: Low-noise (35 µVRMS) 2.500 V reference for programmable-gain instrumentation amplifiers. Use Value: Sub-40 µV RMS noise avoids degrading effective resolution of 24-bit delta-sigma ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable (2.5 V setpoint via resistors), 0.5% initial accuracy, 90 ppm/°C tempco, SOT23-3 | Requires two external resistors; less accurate but lower cost; wider supply range (2.5–36 V) | Select when design flexibility outweighs need for fixed-voltage precision and board space is not constrained. |
| REF3025AIDBZR | 2.500 V fixed, 0.2% accuracy, 50 ppm/°C tempco, SOT23-3, 50 µA min current | Lower tempco improves drift performance; higher quiescent current requirement; not shunt-type (series topology) | Select when tighter thermal drift is critical and system can accommodate series-reference topology and higher minimum current. |
Compared with TLVH431ACDBVR and REF3025AIDBZR, the LM4040BIM3-2.5-T offers the smallest footprint (SC70), true two-terminal simplicity, and lowest noise among shunt references in its class - making it optimal for miniaturized, low-power, fixed-voltage reference needs where layout simplicity and stability with capacitive loads are essential.
Availability
LM4040BIM3-2.5-T is available at Aetrix Electronics and suitable for portable battery monitoring, notebook system reference, industrial process sensor, and medical instrument calibration requiring stable component supply, long-term parametric consistency, and RoHS-compliant packaging.
Supply support for LM4040BIM3-2.5-T 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
Maxim Integrated is a semiconductor company specializing in analog and mixed-signal ICs for power, sensing, interface, and security applications.
The LM4040 product line delivers precision micropower shunt voltage references optimized for space-constrained, battery-operated, and industrial systems demanding high accuracy, low drift, and robust capacitive-load stability.
FAQ
What is the exact reverse breakdown voltage tolerance of LM4040BIM3-2.5-T at +25°C?
The LM4040BIM3-2.5-T has a reverse breakdown voltage of 2.500 V with a tolerance of ±4.0 mV (±0.2%) at +25°C, as specified in the Electrical Characteristics table for the B-grade device. This value is laser-trimmed and guaranteed across production lots.
Can LM4040BIM3-2.5-T operate stably with a 10 µF ceramic output capacitor?
Yes, the LM4040BIM3-2.5-T is explicitly designed to remain stable with any capacitive load - including 10 µF ceramic capacitors - without requiring external compensation. This eliminates the need for output capacitors in most applications and simplifies layout.
What is the minimum operating current required for LM4040BIM3-2.5-T to maintain regulation?
The LM4040BIM3-2.5-T requires a minimum shunt current of 60 µA to maintain regulation across its full temperature range (–40°C to +85°C). Below this, output voltage may deviate beyond specification; typical minimum is 65 µA per datasheet conditions.
Is Pin 3 of LM4040BIM3-2.5-T required to be connected?
No - Pin 3 of the LM4040BIM3-2.5-T is marked N.C. (no connection) and must be left unconnected or tied to Pin 2 (cathode). It is not internally bonded; connecting it elsewhere may compromise performance or reliability.
How does the temperature coefficient of LM4040BIM3-2.5-T affect its output over –40°C to +85°C?
With a maximum temperature coefficient of 100 ppm/°C, the LM4040BIM3-2.5-T exhibits up to ±0.85 mV total drift over –40°C to +85°C (ΔT = 125°C), calculated as 2.500 V × 100 ppm/°C × 125°C = ±0.03125 V. Actual drift is typically lower and may be positive or negative depending on unit variation.
LM4040BIM3-2.5-T 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:
- Active
- 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-T FAQ
1.How can I place an order for LM4040BIM3-2.5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BIM3-2.5-T 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-T reliable?
The price and inventory of LM4040BIM3-2.5-T 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-T is usually 5 days.
3.What payment methods are accepted for LM4040BIM3-2.5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BIM3-2.5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BIM3-2.5-T?
LM4040BIM3-2.5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BIM3-2.5-T 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-T?
For technical support, including LM4040BIM3-2.5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BIM3-2.5-T requirements.
6.How does Aetrix verify that LM4040BIM3-2.5-T is sourced from the original manufacturer or authorized distributors?
All LM4040BIM3-2.5-T 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-T meets industry standards.
7.What is the process for return or replacement of LM4040BIM3-2.5-T?
All LM4040BIM3-2.5-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BIM3-2.5-T, 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-T part is unused and in its original packaging.
Return procedure for LM4040BIM3-2.5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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