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Analog Devices Inc./Maxim Integrated LM4040BIX3-2.1-T
- Part No.:
- LM4040BIX3-2.1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040BIX3-2.1-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LM4040BIX3-2.1-T from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, featuring 0.2% initial accuracy, ±100ppm/°C temperature coefficient, and stable operation from 60μA to 15mA shunt current. It delivers low 28μVRMS noise (10Hz–10kHz) and supports space-constrained battery-powered systems requiring high-accuracy analog sensing or ADC reference.
For engineers reviewing the LM4040BIX3-2.1-T datasheet, LM4040BIX3-2.1-T pinout, LM4040BIX3-2.1-T application, or LM4040BIX3-2.1-T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, no external capacitor requirement, subminiature 1.8mm × 1.8mm footprint, and compatibility with micropower supply rails in portable instrumentation and industrial sensor nodes.
Technical Context
The LM4040BIX3-2.1-T uses laser-trimmed bandgap circuitry to maintain a precise 2.048V reverse breakdown voltage across its cathode-anode terminals. Its internal architecture eliminates need for output capacitance while tolerating arbitrary capacitive loads - a critical advantage over series references in dynamically loaded systems.
It operates as a two-terminal shunt device: reverse current (cathode-to-anode) regulates voltage by sinking variable current through an external series resistor. With dynamic impedance as low as 0.3Ω at 1mA, it maintains voltage stability across wide current (60μA–15mA) and temperature (-40°C to +85°C) ranges without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.048V nominal; ±4.0mV (±0.2%) initial tolerance at +25°C ensures accurate ADC biasing in 12-bit systems |
| Temperature Coefficient | ±100ppm/°C max over -40°C to +85°C; adds ≤±8.2mV drift across full range, suitable for non-ovenized industrial sensors |
| Shunt Current Range | 60μA to 15mA; enables use with high-value source resistors (>100kΩ) in ultra-low-power applications |
| Dynamic Impedance | 0.3Ω to 0.8Ω at 1mA; minimizes load-induced voltage shift during transient current changes |
| Output Noise | 28μVRMS (10Hz–10kHz); supports high-resolution data acquisition without added filtering |
| Long-Term Stability | 120ppm after 1000h; predictable aging behavior for calibration-critical measurement systems |
Pinout & Package
LM4040BIX3-2.1-T is housed in a RoHS-compliant 3-pin SC70 surface-mount package (1.8mm × 1.8mm × 0.9mm), 50% smaller than SOT23 equivalents. Pin 3 is unconnected (N.C.) and must remain floating or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias input terminal; connects to positive supply rail via series resistor |
| 2 (–) | Anode | Reference ground node; ties to system ground and load return path |
| 3 (N.C.) | No Connection | Must be left unconnected or shorted to pin 2; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves PCB real estate in wearables and compact IoT modules |
| No output capacitor required | Eliminates BOM cost and layout risk associated with stability-compensation capacitors |
| Capacitive load tolerance | Stable with any output capacitance - simplifies interface to ADC input buffers or op-amp followers |
| Wide operating current range | 60μA minimum start-up current enables use in energy-harvesting systems with microamp-level sources |
| Guaranteed -40°C to +85°C operation | Validated performance across commercial/industrial ambient range without derating |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered pulse oximeter with 16-bit sigma-delta ADC measuring photodiode current. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for ADC VREF input, enabling <1 LSB INL error over temperature. Use Value: 0.2% initial accuracy and ±100ppm/°C TC ensure consistent gain calibration across patient environments from clinic to field. | Use Scenario: Remote environmental monitor logging temperature/humidity using low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Supplies precision reference to analog sensor signal conditioning and internal ADC. Use Value: 60μA minimum operating current extends battery life beyond 5 years on coin-cell power. |
| Smart Meter Analog Front-End | Automotive Cabin Sensor Modules |
Use Scenario: Electricity meter measuring line voltage/current with isolation amplifiers feeding 24-bit ADC. IC Role / Device Role / Timing Role: Reference source for isolated ADC side, referenced to system ground via optocoupler feedback. Use Value: Low 28μVRMS noise prevents quantization uncertainty in high-resolution metrology-grade measurements. | Use Scenario: Occupancy detection module using IR thermopile sensor in automotive HVAC control unit. IC Role / Device Role / Timing Role: Stable voltage reference for thermopile amplifier gain-setting and ADC conversion. Use Value: Guaranteed operation to +85°C ambient enables reliable performance inside dashboard electronics enclosures. |
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 reference; 0.5% initial accuracy; higher 150ppm/°C TC; SOT23-3 package | Requires two external resistors for 2.048V setting; less accurate and noisier (75μVRMS) | Select only if adjustable output or higher voltage capability is needed; not drop-in compatible |
| MAX6002BESA+ | Fixed 2.048V; 0.2% accuracy; ±50ppm/°C TC; SO-8 package; higher 100μA min current | Larger footprint and higher quiescent current limit suitability for space-constrained, ultra-low-power designs | Prefer when lower temperature drift is critical and board area permits SO-8; not pin-compatible |
Compared with TLVH431ACDBVR and MAX6002BESA+, the LM4040BIX3-2.1-T offers superior size efficiency (SC70 vs SOT23/SO-8), lowest noise, and tightest TC among fixed 2.048V shunt references in its class - making it optimal for miniaturized, battery-sensitive measurement systems.
Availability
LM4040BIX3-2.1-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and smart meter analog front-ends requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4040BIX3-2.1-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 management, sensing, and communications applications.
The LM4040 product line delivers precision shunt voltage references optimized for space-constrained, micropower systems where stability, low noise, and minimal external components are essential - targeting portable instrumentation, industrial automation, and automotive cabin electronics.
FAQ
What is the exact reference voltage and tolerance of LM4040BIX3-2.1-T at +25°C?
The LM4040BIX3-2.1-T has a nominal reverse breakdown voltage of 2.048V with ±4.0mV (±0.2%) initial tolerance at +25°C, as specified in the B-grade electrical characteristics table. This tolerance remains valid across the full -40°C to +85°C operating range when combined with its ±100ppm/°C temperature coefficient.
Does LM4040BIX3-2.1-T require an external output capacitor for stability?
No, the LM4040BIX3-2.1-T does not require an external output capacitor and is stable with any capacitive load. Its internal design ensures frequency stability without external compensation - a key differentiator from many series references and older shunt devices that mandate minimum capacitance.
What is the minimum shunt current needed for LM4040BIX3-2.1-T to regulate properly?
The LM4040BIX3-2.1-T requires a minimum shunt current of 60μA to maintain regulation across its full operating temperature range (-40°C to +85°C). At +25°C, the typical minimum is 45μA, but 60μA ensures guaranteed performance under worst-case conditions including temperature extremes and process variation.
Can LM4040BIX3-2.1-T be used in automotive applications requiring operation to +125°C?
No, the LM4040BIX3-2.1-T is rated for -40°C to +85°C operation only. For +125°C ambient operation, select the LM4040BEX3-2.1-T variant, which is qualified over -40°C to +125°C and shares identical electrical specs except for extended temperature validation and top-mark code (ALG).
What is the purpose of Pin 3 (N.C.) on LM4040BIX3-2.1-T, and how should it be handled?
Pin 3 on the LM4040BIX3-2.1-T is designated N.C. (No Connection) and is not internally bonded. Per the datasheet, it must either be left unconnected or tied directly to Pin 2 (anode). Leaving it floating or connecting it to any other net may cause unpredictable behavior or violate reliability specifications.
LM4040BIX3-2.1-T 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 28µVrms
- 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
LM4040BIX3-2.1-T FAQ
1.How can I place an order for LM4040BIX3-2.1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BIX3-2.1-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 LM4040BIX3-2.1-T reliable?
The price and inventory of LM4040BIX3-2.1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BIX3-2.1-T is usually 5 days.
3.What payment methods are accepted for LM4040BIX3-2.1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BIX3-2.1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BIX3-2.1-T?
LM4040BIX3-2.1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BIX3-2.1-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 LM4040BIX3-2.1-T?
For technical support, including LM4040BIX3-2.1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BIX3-2.1-T requirements.
6.How does Aetrix verify that LM4040BIX3-2.1-T is sourced from the original manufacturer or authorized distributors?
All LM4040BIX3-2.1-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 LM4040BIX3-2.1-T meets industry standards.
7.What is the process for return or replacement of LM4040BIX3-2.1-T?
All LM4040BIX3-2.1-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BIX3-2.1-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 LM4040BIX3-2.1-T part is unused and in its original packaging.
Return procedure for LM4040BIX3-2.1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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