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Analog Devices Inc./Maxim Integrated LM4040BIX3-2.5+T
- Part No.:
- LM4040BIX3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040BIX3-2.5+T.pdf
- Description:
- IC VREF SHUNT 0.2% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,288
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Product details
Overview
LM4040BIX3-2.5+T from Maxim Integrated is a precision 2.500V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.2% initial accuracy, 100ppm/°C max temperature coefficient, and stable operation from 60μA to 15mA shunt current. It delivers low 35µVRMS noise (10Hz–10kHz) and supports space-constrained battery-powered instrumentation requiring high DC accuracy.
For engineers reviewing the LM4040BIX3-2.5+T datasheet, LM4040BIX3-2.5+T pinout, LM4040BIX3-2.5+T application, or LM4040BIX3-2.5+T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, no external capacitor requirement, ultra-small 1.8mm × 1.8mm footprint, and compatibility with capacitive loads in portable analog front-ends and ADC reference circuits.
Technical Context
The LM4040BIX3-2.5+T uses bandgap-based shunt regulation to maintain a precise 2.500V reverse breakdown voltage across its terminals when biased with 60μA–15mA cathode-to-anode current. Its laser-trimmed internal resistor ensures tight initial tolerance without external trimming components.
It operates as a two-terminal device with no enable pin or series pass element-voltage regulation is achieved solely by sinking variable current through the reference node. Stability is maintained over full temperature range (-40°C to +85°C) and load current variation without output capacitance, due to inherently low dynamic impedance (≤0.8Ω at 1mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.2% at +25°C - enables accurate 12-bit ADC reference for 2.5V full-scale systems |
| Initial Accuracy | ±0.2% (B grade) - eliminates need for system-level calibration in mid-precision sensor interfaces |
| Temp Coefficient | 100ppm/°C max - contributes ≤±8.5mV drift over -40°C to +85°C operating range |
| Shunt Current Range | 60μA to 15mA - supports micropower sleep modes and high-current regulation in same design |
| Dynamic Impedance | 0.3Ω to 0.8Ω at 1mA - ensures minimal voltage shift under transient load changes |
| Wideband Noise | 35µVRMS (10Hz–10kHz) - suitable for 16-bit SAR ADC reference without additional filtering |
| Operating Temp | -40°C to +85°C - qualified for industrial and consumer portable equipment environments |
Pinout & Package
LM4040BIX3-2.5+T is housed in a RoHS-compliant, lead-free 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is NC and must be left unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to regulated reference node; sinks current when reverse-biased |
| 2 (–) | Cathode (negative terminal) | Reference ground return path; forms shunt loop with external current-limiting resistor |
| 3 (N.C.) | No connection | Must remain floating or shorted to pin 2; no internal function or signal routing |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint saves >50% board area vs. SOT23, critical for wearables and compact modules |
| No output capacitor required | Stable under all capacitive loads - eliminates BOM cost, layout risk, and startup delay from external C |
| Low 35µVRMS noise | Enables direct use with 16-bit SAR ADCs without noise-filtering RC networks |
| 60μA minimum operating current | Supports ultra-low-power sleep states while retaining regulation integrity |
| AEC-Q100 not applicable | This variant is rated for industrial temp range only; automotive-grade versions use /V suffix |
Applications
| Portable Medical Sensors | Notebook System Monitoring |
|---|---|
Use Scenario: Reference for analog front-end of wearable ECG/PPG sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 2.5V bias for op-amp gain stages and ADC input scaling. Use Value: 60μA min current enables >1-year battery life in sleep mode; SC70 size fits sub-10mm² PCB real estate. | Use Scenario: Voltage reference for system power rail monitors (e.g., +3.3V, +5V) in ultrabook motherboard VRM telemetry. IC Role / Device Role / Timing Role: Precision shunt reference feeding comparator inputs for rail fault detection. Use Value: ±0.2% accuracy ensures reliable margin checking against JEDEC spec limits; no capacitor simplifies layout near noisy digital sections. |
| Industrial Data Acquisition | Smart Home Sensor Hubs |
Use Scenario: Reference source for 24-bit delta-sigma ADC in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Stable 2.5V reference for ratiometric measurement of 4–20mA loop transmitters. Use Value: 100ppm/°C TC and -40°C to +85°C rating ensure <0.1% total error across factory ambient variations. | Use Scenario: Reference for battery voltage monitoring and environmental sensor signal conditioning in Zigbee/Z-Wave hubs. IC Role / Device Role / Timing Role: Shunt reference establishing known voltage for MCU ADC sampling of Li-ion cell voltage and thermistor dividers. Use Value: Low 35µVRMS noise prevents ADC code flicker; SC70 package allows placement directly adjacent to sensor ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | Adjustable 1.24V–6V output; 0.5% initial accuracy; higher 300ppm/°C TC; SOT23-3 package | Requires two external resistors for 2.5V setting; less stable over temperature than LM4040BIX3-2.5+T | Select when adjustable output or lower cost is prioritized over precision and thermal stability |
| MAX6002BESA+ | Fixed 2.5V output; 0.2% accuracy; 50ppm/°C TC; SO-8 package; higher quiescent current (65µA min) | Larger SO-8 footprint; superior TC but incompatible pinout and package size | Select when tighter temperature drift (<±4.25mV over -40°C to +85°C) justifies larger board area |
Compared with TLV431ACDBVR and MAX6002BESA+, the LM4040BIX3-2.5+T offers the optimal balance of SC70 size, 0.2% accuracy, and 100ppm/°C TC for space-constrained industrial and portable designs where fixed 2.5V is acceptable and ultra-low minimum current matters.
Availability
LM4040BIX3-2.5+T is available at Aetrix Electronics and suitable for portable medical sensors, notebook system monitoring, industrial data acquisition, and smart home sensor hubs requiring stable component supply and long-term production continuity.
Supply support for LM4040BIX3-2.5+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, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, communications, and consumer applications with emphasis on integration, reliability, and performance.
The LM4040 product line delivers micropower, high-accuracy shunt references for space- and power-sensitive systems where traditional three-terminal references are impractical.
FAQ
What is the exact output voltage tolerance of LM4040BIX3-2.5+T at +25°C?
The LM4040BIX3-2.5+T has a nominal output voltage of 2.500V with a tolerance of ±0.2% at +25°C, corresponding to a range of 2.495V to 2.505V. This B-grade accuracy is laser-trimmed during production and guaranteed per Maxim's datasheet Electrical Characteristics table for the 2.500V version.
Does LM4040BIX3-2.5+T require an external capacitor for stability?
No, the LM4040BIX3-2.5+T does not require an external output capacitor and remains stable with any capacitive load. Its internal design achieves low dynamic impedance (≤0.8Ω) and inherent phase margin, eliminating the need for external compensation-unlike many series references or older shunt devices.
What is the minimum operating current for LM4040BIX3-2.5+T, and why is it important?
The LM4040BIX3-2.5+T requires a minimum shunt current of 60μA to maintain regulation. Below this threshold, the reference voltage deviates from specification. This low value enables ultra-low-power operation in battery-backed or sleep-mode applications while preserving accuracy.
Can LM4040BIX3-2.5+T be used in automotive applications?
The LM4040BIX3-2.5+T is specified for -40°C to +85°C operation and is not AEC-Q100 qualified. For automotive use, select variants with the /V suffix (e.g., LM4040BIM3-2.5/V+T), which are explicitly qualified to AEC-Q100 Grade 3 and rated for -40°C to +125°C junction temperature.
What is the purpose of Pin 3 (N.C.) on LM4040BIX3-2.5+T, and how should it be handled?
Pin 3 on the LM4040BIX3-2.5+T is designated N.C. (No Connection) and serves no internal function. Per Maxim's datasheet, it must either be left unconnected or tied directly to Pin 2 (cathode). Floating Pin 3 is acceptable, but connecting it to Pin 2 ensures mechanical robustness and avoids potential ESD coupling paths.
LM4040BIX3-2.5+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for LM4040BIX3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BIX3-2.5+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 LM4040BIX3-2.5+T reliable?
The price and inventory of LM4040BIX3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BIX3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040BIX3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BIX3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BIX3-2.5+T?
LM4040BIX3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BIX3-2.5+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 LM4040BIX3-2.5+T?
For technical support, including LM4040BIX3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BIX3-2.5+T requirements.
6.How does Aetrix verify that LM4040BIX3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040BIX3-2.5+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 LM4040BIX3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040BIX3-2.5+T?
All LM4040BIX3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BIX3-2.5+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 LM4040BIX3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040BIX3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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