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Analog Devices Inc./Maxim Integrated LM4040CIX3-2.1+
- Part No.:
- LM4040CIX3-2.1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CIX3-2.1+.pdf
- Description:
- LM4040 IMPROVED PRECISION MICROP
- Quantity:
- Payment:
- Shipping:
Inventory:3,160
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Product details
Overview
LM4040CIX3-2.1+ from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.5% initial accuracy, 100ppm/°C max temperature coefficient, 60µA to 15mA operating current range, and guaranteed operation from –40°C to +85°C. It delivers stable reverse breakdown voltage for analog-to-digital converter (ADC) reference and portable power monitoring circuits.
For engineers reviewing the LM4040CIX3-2.1+ datasheet, LM4040CIX3-2.1+ pinout, LM4040CIX3-2.1+ application, or LM4040CIX3-2.1+ equivalent, key selection criteria include shunt current capability, low dynamic impedance (0.9Ω typ), 28µVRMS wideband noise (10Hz–10kHz), no output capacitor requirement, and SC70 footprint compatibility with space-constrained PCB layouts.
Technical Context
The LM4040CIX3-2.1+ uses bandgap-based shunt regulation to maintain a precise 2.048V reverse breakdown voltage across its terminals when biased with 60µA–15mA cathode-to-anode current. Its internal laser-trimmed resistor network ensures factory-calibrated accuracy without external trimming.
It operates as a two-terminal device with no ground reference required, exhibits stable performance under capacitive loads, and achieves ±15ppm/°C typical temperature coefficient over –40°C to +85°C - validated by design and production-tested at +25°C with full-range guarantee.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±10mV tolerance at +25°C (C-grade), enabling direct interface with 12-bit ADCs requiring ≤0.5% reference error. |
| Initial Accuracy | ±0.5% (C grade); corresponds to ±10.24mV absolute error at 2.048V, sufficient for industrial sensor signal conditioning. |
| Temp Coefficient | Max 100ppm/°C; contributes ≤±8.2mV drift over –40°C to +85°C, critical for battery-powered metering accuracy. |
| Operating Current | 60µA min to 15mA max; supports ultra-low-power IoT nodes and high-current DAC references without external biasing. |
| Dynamic Impedance | 0.9Ω typical at 1mA; ensures <1mV output shift under 1mA load transients, vital for precision feedback loops. |
| Output Noise | 28µVRMS (10Hz–10kHz); enables sub-LSB stability in 16-bit SAR ADC applications without filtering. |
| Long-Term Stability | 120ppm over 1000h; guarantees reference drift <0.25mV after one year, supporting medical device calibration intervals. |
Pinout & Package
The LM4040CIX3-2.1+ is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents, optimized for high-density portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-biased terminal; connects to regulated voltage node; sinks shunt current to maintain 2.048V. |
| 2 (−) | Anode | Reference ground return path; must be tied to system ground or common reference plane. |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to Pin 2; floating connection risks parametric shift or instability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint reduces board area by 50% vs. SOT23, enabling wearables and hearing aids. |
| No output capacitor required | Stable with any capacitive load up to 10µF, eliminating BOM cost and layout constraints for decoupling. |
| Wide shunt current range | 60µA–15mA operation supports both micropower sensors and high-speed data converters. |
| Laser-trimmed accuracy | Factory-set ±0.5% tolerance eliminates post-assembly calibration, reducing test time and cost. |
| Guaranteed temp range | –40°C to +85°C operation validated per production test, ensuring reliability in automotive cabin modules. |
Applications
| Portable Medical Sensors | Battery Fuel Gauging |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) front-end analog signal chain requiring stable 2.048V reference for 12-bit ADC digitization. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and conversion reference for transimpedance amplifier and ADC. Use Value: ±0.5% initial accuracy and 100ppm/°C TC ensure <±1 LSB error across body temperature range (32–42°C). | Use Scenario: Smart battery pack fuel gauge IC measuring cell voltage via precision resistive divider. IC Role / Device Role / Timing Role: Stable 2.048V reference for ratiometric measurement of battery voltage against known reference. Use Value: 60µA minimum operating current enables operation during deep sleep mode, extending battery life >30%. |
| Industrial Process Transmitters | USB-Powered Test Equipment |
Use Scenario: 4–20mA loop-powered pressure transmitter with onboard microcontroller and analog front end. IC Role / Device Role / Timing Role: Primary voltage reference for DAC output scaling and sensor bridge excitation. Use Value: SC70 package fits within 10mm² PCB area budget; long-term stability (120ppm/1000h) meets SIL-2 calibration requirements. | Use Scenario: Portable oscilloscope probe adapter drawing power directly from USB 5V bus. IC Role / Device Role / Timing Role: Low-noise 2.048V reference for 16-bit delta-sigma ADC sampling analog inputs. Use Value: 28µVRMS noise floor enables effective resolution >15.5 bits, meeting ENOB specs for handheld diagnostics. |
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; 0.5% initial accuracy; 100ppm/°C TC; SOT23-3 package. | Requires two external resistors for 2.048V setting; higher minimum cathode current (80µA). | Choose when adjustable reference or higher voltage flexibility is needed; verify resistor tolerance impact on accuracy. |
| MAX6008AEUR+T | Fixed 2.048V; 0.2% initial accuracy; 50ppm/°C TC; SC70-3 package; 50µA–10mA operating range. | Tighter accuracy and lower TC, but reduced max shunt current limits regulation headroom in high-load designs. | Choose for metrology-grade systems where ±0.2% and 50ppm/°C outweigh 15mA current capability needs. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040CIX3-2.1+ offers optimal balance of fixed 2.048V precision, SC70 size, 15mA headroom, and proven stability in battery-critical applications - making it preferred for space- and power-constrained embedded systems.
Availability
LM4040CIX3-2.1+ is available at Aetrix Electronics and suitable for portable medical sensors, battery fuel gauging, and industrial process transmitters requiring stable component supply with consistent lead times and RoHS-compliant packaging.
Supply support for LM4040CIX3-2.1+ 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, medical, and communications applications.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems requiring stable, accurate, and capacitor-free voltage references across extended temperature ranges.
FAQ
What is the exact output voltage tolerance of LM4040CIX3-2.1+ at +25°C?
The LM4040CIX3-2.1+ has a nominal output voltage of 2.048V with ±0.5% initial accuracy at +25°C, corresponding to a guaranteed range of 2.038V to 2.058V. This tolerance is laser-trimmed during manufacturing and applies specifically to the C-grade variant denoted in the part number.
Does LM4040CIX3-2.1+ require an external output capacitor for stability?
No, the LM4040CIX3-2.1+ does not require an external output capacitor and remains stable with any capacitive load - including 0µF up to 10µF. This eliminates BOM cost and layout complexity, and is confirmed by design validation across all operating conditions in the official datasheet.
What is the minimum operating current for reliable regulation of LM4040CIX3-2.1+?
The LM4040CIX3-2.1+ requires a minimum shunt current of 60µA to maintain regulation. Below this threshold, output voltage deviates beyond specification; the device is guaranteed to regulate properly across its full –40°C to +85°C temperature range when IR ≥ 60µA.
Can LM4040CIX3-2.1+ be used in automotive under-hood applications?
The LM4040CIX3-2.1+ is rated for –40°C to +85°C operation and is not qualified for under-hood automotive use (which typically requires –40°C to +125°C). For such environments, the LM4040CEX3-2.1+T variant - specified to +125°C - is the appropriate choice.
What is the pin configuration and package type of LM4040CIX3-2.1+?
The LM4040CIX3-2.1+ uses a 3-pin SC70 package (1.8mm × 1.8mm). Pin 1 is cathode (+), Pin 2 is anode (−), and Pin 3 is no-connect (N.C.), which must either remain unconnected or be tied to Pin 2 - never left floating.
LM4040CIX3-2.1+ 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:
- ±0.5%
- 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
LM4040CIX3-2.1+ FAQ
1.How can I place an order for LM4040CIX3-2.1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIX3-2.1+ 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 LM4040CIX3-2.1+ reliable?
The price and inventory of LM4040CIX3-2.1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIX3-2.1+ is usually 5 days.
3.What payment methods are accepted for LM4040CIX3-2.1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIX3-2.1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIX3-2.1+?
LM4040CIX3-2.1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIX3-2.1+ 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 LM4040CIX3-2.1+?
For technical support, including LM4040CIX3-2.1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIX3-2.1+ requirements.
6.How does Aetrix verify that LM4040CIX3-2.1+ is sourced from the original manufacturer or authorized distributors?
All LM4040CIX3-2.1+ 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 LM4040CIX3-2.1+ meets industry standards.
7.What is the process for return or replacement of LM4040CIX3-2.1+?
All LM4040CIX3-2.1+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIX3-2.1+, 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 LM4040CIX3-2.1+ part is unused and in its original packaging.
Return procedure for LM4040CIX3-2.1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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