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Analog Devices Inc./Maxim Integrated LM4040CIX3-4.1
- Part No.:
- LM4040CIX3-4.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CIX3-4.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,277
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Product details
Overview
LM4040CIX3-4.1 from Maxim Integrated is a precision two-terminal shunt voltage reference with 4.096V nominal reverse breakdown voltage, ±0.5% initial accuracy (C grade), 100ppm/°C max temperature coefficient, and operation from 60µA to 15mA shunt current - used in ADC/DAC reference, portable power monitoring, and battery management circuits.
For engineers reviewing the LM4040CIX3-4.1 datasheet, LM4040CIX3-4.1 pinout, LM4040CIX3-4.1 application, or LM4040CIX3-4.1 equivalent, this page delivers verified electrical parameters, SC70-3 package mapping, real-world use scenarios, and validated alternative options for space-constrained, low-power analog systems.
Technical Context
The LM4040CIX3-4.1 implements a bandgap-based shunt reference architecture, delivering stable 4.096V output without external capacitors across any load capacitance. Its BiCMOS process enables low dynamic impedance (0.5–1.0Ω) and 28µVRMS wideband noise (10Hz–10kHz).
It operates as a two-terminal device: cathode (+) and anode (−) define the reference node, while Pin 3 is unconnected or tied to Pin 2. It requires no forward-biasing circuitry and tolerates forward currents up to 10mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal at +25°C; ±20mV tolerance over full temperature range (−40°C to +85°C) |
| Initial Accuracy | ±0.5% (C grade); ensures ≤20.5mV absolute error at room temperature |
| Tempco | ≤100ppm/°C; contributes ≤±26.6mV drift over −40°C to +85°C |
| Shunt Current Range | 60µA to 15mA; supports ultra-low-power sensing and high-current regulation |
| Dynamic Impedance | 0.5Ω typical at 1mA; maintains <3mV output shift under 1mA load transients |
| Output Noise | 28µVRMS (10Hz–10kHz); suitable for 12-bit+ SAR ADC references |
| Long-Term Stability | 120ppm after 1000 hours; <0.012% drift over extended operation |
Pinout & Package
LM4040CIX3-4.1 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23-3. Pin 3 is NC and must be left floating or connected to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Cathode | Reference output node; connects to regulated voltage rail or ADC VREF input |
| Pin 2 (−) | Anode | Return path for shunt current; ties to system ground or low-side current sense |
| Pin 3 (N.C.) | No Connection | Must remain unconnected or shorted to Pin 2; no internal function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area enables placement in dense portable PCB layouts |
| No output capacitor required | Stable with any capacitive load; eliminates BOM cost and layout area for decoupling |
| Low 28µVRMS noise | Enables direct use in 12-bit precision data acquisition without filtering |
| Wide 60µA–15mA operating range | Supports both micropower sensor nodes and higher-current reference buffering |
| Laser-trimmed accuracy | Guaranteed ±0.5% initial tolerance without post-assembly calibration |
Applications
| Portable Battery Monitoring | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Real-time Li-ion cell voltage measurement in handheld medical devices. IC Role / Device Role / Timing Role: Shunt reference providing stable 4.096V基准 for 12-bit ADC conversion of battery voltage. Use Value: Enables ±0.5% full-scale accuracy without trimming, supporting precise state-of-charge estimation. |
Use Scenario: 4–20mA loop-powered temperature transmitter with local analog front-end. IC Role / Device Role / Timing Role: Precision voltage reference for DAC output scaling and sensor excitation. Use Value: Maintains loop accuracy over −40°C to +85°C with ≤±26.6mV total tempco-induced error. |
| USB-C Power Delivery Feedback | Energy Meter Reference Subsystem |
Use Scenario: Voltage feedback divider reference in programmable buck converter for USB PD sink. IC Role / Device Role / Timing Role: Stable 4.096V reference for error amplifier input in isolated DC-DC control loop. Use Value: Ensures <±1% output regulation across line/load/temp with no external capacitor dependency. |
Use Scenario: Reference source for polyphase energy meter ICs (e.g., ADE78xx series). IC Role / Device Role / Timing Role: Primary shunt reference feeding metrology ADC and calibration circuitry. Use Value: Delivers 120ppm long-term stability and 28µVRMS noise compatible with 0.1% accuracy class meters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C41IDBZR | 4.096V, ±0.5%, SC70-3, 100ppm/°C, but 75µA min operating current | Higher minimum current limits use in sub-100µA micropower designs | Select when TI supply chain preference or dual-sourcing is required; verify RS resistor recalculations. |
| ADR3441ARJZ-R7 | 4.096V, ±0.1%, SOT23-5, 30ppm/°C, 100µA–20mA range, but 5-pin active configuration | Requires enable pin control and separate ground; not drop-in for 2-terminal topology | Choose only if tighter initial accuracy and lower tempco justify redesign for 5-pin layout and bias control. |
Compared with TL4050C41IDBZR and ADR3441ARJZ-R7, the LM4040CIX3-4.1 offers true 2-terminal simplicity, lowest noise in its class, and guaranteed SC70-3 compatibility - making it optimal for compact, capacitor-free, low-noise shunt reference implementations where pin count and layout area are constrained.
Availability
LM4040CIX3-4.1 is available at Aetrix Electronics and suitable for portable battery monitoring, industrial sensor signal conditioning, and USB-C power delivery feedback requiring stable component supply with tight initial tolerance and low thermal drift.
Supply support for LM4040CIX3-4.1 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, two-terminal shunt voltage references optimized for space-constrained, low-noise, and capacitor-free applications across portable and industrial systems.
FAQ
What is the exact output voltage tolerance of LM4040CIX3-4.1 over temperature?
The LM4040CIX3-4.1 has ±0.5% initial accuracy at +25°C and a maximum temperature coefficient of 100ppm/°C. Over −40°C to +85°C, its total output voltage tolerance is ±20mV (±0.49%) relative to 4.096V, calculated as ±0.5% ± (100ppm/°C × 65°C × 4.096V). This is confirmed in the Electrical Characteristics table for LM4040_I_3-4.1 under "Reverse Breakdown Voltage Tolerance".
Does LM4040CIX3-4.1 require an external capacitor for stability?
No, the LM4040CIX3-4.1 does not require an external output capacitor and remains stable with any capacitive load. This is explicitly stated in the General Description and Applications Information sections, and confirmed by test data showing stable transient response across 0–1µF loads. The device's internal design eliminates capacitor dependency, reducing BOM count and PCB area.
What is the minimum operating current for LM4040CIX3-4.1?
The LM4040CIX3-4.1 has a minimum operating current (IRMIN) of 50µA at −40°C to +85°C, per the Electrical Characteristics table for LM4040_I_3-4.1. At +25°C, it regulates stably down to 45µA. Maintaining ≥50µA ensures guaranteed performance across the full temperature range, critical for battery-powered systems near end-of-life voltage.
How is pin 3 used on LM4040CIX3-4.1?
Pin 3 of the LM4040CIX3-4.1 is designated N.C. (No Connection) and must be left floating or connected directly to Pin 2 (anode/−). The datasheet explicitly states "PIN 3 MUST BE LEFT FLOATING OR CONNECTED TO PIN 2" - it serves no internal function and connecting it elsewhere may compromise performance or reliability.
What package type does LM4040CIX3-4.1 use, and how does it compare to SOT23-3?
The LM4040CIX3-4.1 uses the SC70-3 package (1.8mm × 1.8mm), which is 50% smaller than the SOT23-3 variant (LM4040CIM3-4.1). Both are 3-pin surface-mount packages, but SC70-3 enables higher board density in portable and wearables applications. Pinout is identical: Pin 1 (+), Pin 2 (−), Pin 3 (N.C.). Thermal derating differs: SC70-3 dissipates 174mW at +70°C vs. 320mW for SOT23-3.
LM4040CIX3-4.1 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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 64µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 73 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040CIX3-4.1 FAQ
1.How can I place an order for LM4040CIX3-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIX3-4.1 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 LM4040CIX3-4.1 reliable?
The price and inventory of LM4040CIX3-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIX3-4.1 is usually 5 days.
3.What payment methods are accepted for LM4040CIX3-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIX3-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIX3-4.1?
LM4040CIX3-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIX3-4.1 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 LM4040CIX3-4.1?
For technical support, including LM4040CIX3-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIX3-4.1 requirements.
6.How does Aetrix verify that LM4040CIX3-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4040CIX3-4.1 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 LM4040CIX3-4.1 meets industry standards.
7.What is the process for return or replacement of LM4040CIX3-4.1?
All LM4040CIX3-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIX3-4.1, 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 LM4040CIX3-4.1 part is unused and in its original packaging.
Return procedure for LM4040CIX3-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIX3-4.1 Tags
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TL431AIDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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