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Analog Devices Inc./Maxim Integrated LM4040BIX3-2.5
- Part No.:
- LM4040BIX3-2.5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040BIX3-2.5.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,447
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Product details
Overview
LM4040BIX3-2.5 from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference in SC70-3 package, featuring ±4.0mV initial tolerance (0.2%), ±15ppm/°C temperature coefficient over –40°C to +85°C, 60µA–15mA operating current range, and 35µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference in portable battery-powered analog-to-digital converters and precision sensor signal conditioning circuits.
For engineers reviewing the LM4040BIX3-2.5 datasheet, LM4040BIX3-2.5 pinout, LM4040BIX3-2.5 application, or LM4040BIX3-2.5 equivalent, key selection criteria include shunt current capability, temperature drift performance, SC70 footprint constraints, and compatibility with capacitive loads without external stabilization.
Technical Context
The LM4040BIX3-2.5 uses a bandgap-based shunt architecture to maintain a fixed 2.500V reverse breakdown voltage across its terminals when biased with 60µA to 15mA of cathode-to-anode current. Its BiCMOS process enables low dynamic impedance (0.3–0.8Ω at 1mA) and stable regulation without output capacitance.
It operates over –40°C to +85°C with guaranteed initial accuracy of ±4.0mV and total temperature-induced error ≤ ±0.85% across the full range. Pin 3 is unconnected or tied to pin 2, confirming true two-terminal functional operation despite the three-pin SC70 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V nominal; ±4.0mV (0.2%) initial tolerance at +25°C ensures high-accuracy ADC reference calibration. |
| Temperature Coefficient | ±15ppm/°C max; guarantees ≤ ±0.85% total voltage drift from –40°C to +85°C for industrial-grade stability. |
| Operating Current Range | 60µA to 15mA; supports ultra-low-power sensor nodes and higher-current precision DAC references. |
| Dynamic Impedance | 0.3–0.8Ω at 1mA; maintains tight regulation under fast load transients without external capacitor. |
| Wideband Noise | 35µVRMS (10Hz–10kHz); suitable for 12-bit+ data acquisition systems requiring low-noise references. |
| Long-Term Stability | 120ppm after 1000h; ensures minimal calibration drift in deployed instrumentation. |
Pinout & Package
LM4040BIX3-2.5 is housed in a subminiature 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23-3. Pin 3 is NC (no connection) and must be left floating or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Terminal | Connects to system ground or low-side reference node; forms cathode-to-anode bias path with external resistor. |
| 2 (−) | Cathode / Negative Terminal | Provides regulated 2.500V output; sinks shunt current to maintain stable voltage under varying load conditions. |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to pin 2; no internal circuitry attached-ensures true two-terminal functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area enables placement in space-constrained portable electronics like wearables and IoT sensors. |
| No output capacitor required | Internally compensated design remains stable with any capacitive load, simplifying layout and reducing BOM count. |
| Low 35µVRMS noise | Enables high-resolution (≥12-bit) analog measurements without additional filtering or post-regulation stages. |
| 60µA minimum operating current | Supports micropower operation in battery-backed systems where quiescent current must stay below 100µA. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG front-end amplifiers requiring stable 2.5V reference for 16-bit ADC conversion. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precise, low-drift voltage for analog signal chain biasing and ADC full-scale calibration. Use Value: Enables <1 LSB integral nonlinearity error over temperature due to ±0.85% total drift and 35µVRMS noise performance. | Use Scenario: Remote environmental monitoring nodes measuring temperature/humidity with 12-bit SAR ADCs. IC Role / Device Role / Timing Role: Micropower shunt reference supplying regulated 2.5V to ADC and sensor excitation circuitry from a 3.3V rail. Use Value: Delivers accurate readings over –40°C to +85°C with only 60µA minimum current, extending battery life beyond 5 years. |
| Smartphone Power Management | Automotive Cabin Sensors |
Use Scenario: Real-time battery voltage monitoring using a precision resistive divider referenced to LM4040BIX3-2.5. IC Role / Device Role / Timing Role: Stable voltage reference for analog front-end comparators and fuel-gauge ICs in mobile SoC power domains. Use Value: Maintains ±4.0mV initial accuracy and tolerates capacitive loads from adjacent LDOs, eliminating need for isolation components. | Use Scenario: Occupancy detection modules using MEMS accelerometers and low-power microcontrollers. IC Role / Device Role / Timing Role: Shunt reference powering sensor interface circuitry and MCU ADC reference input in 12V automotive subsystems. Use Value: Survives load dump transients via inherent shunt topology and operates reliably across extended temperature range 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 |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable 1.24V–18V output; requires two external resistors; 2% initial accuracy; 90ppm/°C tempco. | Used where programmability or higher voltage is needed; less accurate and less stable than LM4040BIX3-2.5. | Select TLVH431ACDBVR only if adjustable output or wider voltage range is required; not drop-in compatible. |
| REF3025AIDBZR | 2.5V series reference; 0.2% initial accuracy; 50ppm/°C tempco; 50µA quiescent current; requires bypass capacitor. | Preferred in low-noise, low-PSRR applications where source impedance is high; incompatible shunt topology. | Choose REF3025AIDBZR for series-reference architectures needing ultra-low quiescent current; not a functional replacement. |
Compared with TLVH431ACDBVR and REF3025AIDBZR, LM4040BIX3-2.5 offers superior temperature stability (±15ppm/°C vs. 90ppm/°C or 50ppm/°C), eliminates external resistors or capacitors, and delivers lower noise-making it optimal for compact, high-accuracy shunt-referenced designs.
Availability
LM4040BIX3-2.5 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, smartphone power management, and automotive cabin sensors requiring stable component supply and long-term calibration integrity.
Supply support for LM4040BIX3-2.5 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, medical, and communications applications.
LM4040BIX3-2.5 belongs to the LM4040 family of micropower shunt voltage references engineered for space-constrained, battery-operated systems requiring high initial accuracy and low temperature drift without external compensation components.
FAQ
What is the exact output voltage tolerance of LM4040BIX3-2.5 at +25°C?
The LM4040BIX3-2.5 has a guaranteed initial reverse breakdown voltage tolerance of ±4.0mV (±0.2%) at +25°C, corresponding to a 2.4950V to 2.5050V range per the Electrical Characteristics table for the B grade. This specification is laser-trimmed and 100% production tested.
Does LM4040BIX3-2.5 require an external output capacitor for stability?
No, LM4040BIX3-2.5 does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC reference inputs or LDO feedback networks. This eliminates board space and cost associated with external stabilization components.
What is the minimum operating current for LM4040BIX3-2.5, and why is it critical?
The LM4040BIX3-2.5 requires a minimum shunt current of 60µA to maintain regulation. Below this threshold, the device exits reverse breakdown and output voltage collapses. This value defines the lower bound for RS resistor selection in series-bias configurations and directly impacts battery life in micropower applications.
How does the temperature coefficient of LM4040BIX3-2.5 affect system accuracy over –40°C to +85°C?
With a maximum temperature coefficient of ±15ppm/°C, LM4040BIX3-2.5 contributes ≤ ±0.85% total voltage deviation across –40°C to +85°C. This is calculated as ±0.2% initial error plus ±100ppm/°C × 65°C = ±0.65%, yielding ±0.85% worst-case. It enables single-point calibration in many industrial applications.
What is the function of Pin 3 on LM4040BIX3-2.5, and how must it be handled?
Pin 3 of LM4040BIX3-2.5 is labeled N.C. (No Connection) and must be left floating or connected to Pin 2 (cathode). It has no internal connection and exists solely for mechanical compatibility with the SC70-3 package. Incorrect routing-such as tying Pin 3 to VCC or leaving it unterminated without verifying layout clearance-may cause assembly defects but does not affect electrical operation.
LM4040BIX3-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- 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:
- SC-70-3
LM4040BIX3-2.5 FAQ
1.How can I place an order for LM4040BIX3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BIX3-2.5 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 LM4040BIX3-2.5 reliable?
The price and inventory of LM4040BIX3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BIX3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040BIX3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BIX3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BIX3-2.5?
LM4040BIX3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BIX3-2.5 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 LM4040BIX3-2.5?
For technical support, including LM4040BIX3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BIX3-2.5 requirements.
6.How does Aetrix verify that LM4040BIX3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040BIX3-2.5 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 LM4040BIX3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040BIX3-2.5?
All LM4040BIX3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BIX3-2.5, 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 LM4040BIX3-2.5 part is unused and in its original packaging.
Return procedure for LM4040BIX3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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