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Analog Devices Inc./Maxim Integrated LM4041CIM3-1.2+
- Part No.:
- LM4041CIM3-1.2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4041CIM3-1.2+.pdf
- Description:
- LM4041 IMPROVED PRECISION MICROP
- Quantity:
- Payment:
- Shipping:
Inventory:10,535
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Product details
Overview
LM4041CIM3-1.2+ from Maxim Integrated is a precision 1.225V two-terminal shunt voltage reference in SOT23-3 package, rated for -40°C to +85°C operation, with 0.5% initial accuracy, 100ppm/°C max temperature coefficient, and 60µA–12mA operating current range. It serves as a stable reference in portable battery-powered systems where space and low quiescent current are critical.
For engineers reviewing the LM4041CIM3-1.2+ datasheet, LM4041CIM3-1.2+ pinout, LM4041CIM3-1.2+ application, or LM4041CIM3-1.2+ equivalent, key selection criteria include guaranteed initial tolerance over temperature, capacitive-load stability without external compensation, low 20µVRMS noise (10Hz–10kHz), and compatibility with micropower supply rails down to ~1.3V.
Technical Context
The LM4041CIM3-1.2+ implements a bandgap-based shunt reference architecture, maintaining a fixed 1.225V reverse breakdown voltage across its anode and cathode terminals when biased with 60µA–12mA reverse current. Its BiCMOS process enables precise laser-trimmed resistor matching for grade-C (±0.5%) accuracy at +25°C.
Unlike series references, it requires no input capacitor and remains stable with any output capacitance. Its dynamic impedance is ≤1.5Ω at 1mA (120Hz), and long-term stability is 120ppm after 1000 hours - enabling use in calibration-critical instrumentation and sensor signal chains where drift must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal; ±6.0mV tolerance at +25°C ensures predictable ADC/DAC reference point |
| Initial Accuracy | ±0.5% (grade C); guarantees reference error ≤±6.125mV at room temperature |
| Tempco | ≤100ppm/°C; limits worst-case drift to ±6.5mV over -40°C to +85°C |
| Operating Current | 60µA–12mA; supports ultra-low-power sensors and high-current DACs without external buffering |
| Noise (10Hz–10kHz) | 20µVRMS; contributes <0.17% RMS error to 12-bit ADC full-scale measurement |
| Dynamic Impedance | ≤1.5Ω at 1mA; maintains voltage regulation under fast load transients up to 10kHz |
| Long-Term Stability | 120ppm/1000h; predicts <0.012% reference shift per 1000h of continuous operation |
Pinout & Package
LM4041CIM3-1.2+ uses the industry-standard 3-pin SOT23-3 surface-mount package (1.7mm × 2.9mm × 1.3mm), compatible with automated pick-and-place and reflow assembly. Pin 3 is unconnected (N.C.) and must be left floating or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connected to system ground or low-impedance return path; defines reference potential |
| 2 (−) | Cathode (negative terminal) | Connected to regulated voltage node; sinks shunt current to maintain 1.225V across terminals |
| 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; no internal function or electrical path |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive-load stability | No external capacitor required; stable with 0–10µF output capacitance - simplifies layout and reduces BOM count |
| Low-noise operation | 20µVRMS broadband noise enables high-resolution analog measurements without post-filtering |
| Micropower start-up | 60µA minimum operating current allows use with high-value source resistors (>100kΩ) in energy-harvesting systems |
| Wide temperature range | Specified from -40°C to +85°C - suitable for industrial and automotive cabin applications without derating |
| Laser-trimmed accuracy | 0.5% initial tolerance achieved via on-die trimming - eliminates need for system-level calibration in cost-sensitive designs |
Applications
| Portable Medical Sensors | Notebook System Monitoring |
|---|---|
Use Scenario: Reference for 12-bit ADC measuring thermistor or strain gauge outputs in handheld glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.225V reference for ratiometric sensor excitation and ADC conversion. Use Value: 0.5% initial accuracy and 100ppm/°C tempco ensure <±0.2% total measurement error across clinical ambient temperatures (15–40°C). | Use Scenario: Voltage reference for system power-rail monitors (e.g., +3.3V, +5V, +12V) in notebook motherboard EC firmware. IC Role / Device Role / Timing Role: Precision shunt reference feeding comparator inputs for real-time rail health detection. Use Value: Stable 1.225V output enables accurate scaling of higher rails via resistor dividers, with no drift-induced false fault triggers during thermal cycling. |
| Industrial Data Acquisition | Smart Energy Meters |
Use Scenario: Reference for isolated sigma-delta ADCs in 4–20mA loop-powered transmitters. IC Role / Device Role / Timing Role: Micropower shunt reference generating local 1.225V reference within galvanically isolated analog front-end. Use Value: 60µA min operating current allows operation directly from loop power (<4mA), eliminating need for auxiliary supply or charge pumps. | Use Scenario: Reference for metrology-grade ADC measuring voltage/current waveforms in Class 0.2 electricity meters. IC Role / Device Role / Timing Role: Low-drift, low-noise shunt reference ensuring <0.1% gain stability over 10-year field life. Use Value: 120ppm/1000h long-term stability and 20µVRMS noise meet IEC 62053-22 accuracy requirements for revenue-grade metering. |
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 (2.5V min) vs. fixed 1.225V; 0.5% initial accuracy; 100ppm/°C tempco; 80µA–15mA operating range | Requires external resistor divider for 1.225V output; adds 2 passive components and layout area | Select TLVH431ACDBVR only if design requires programmability or shares existing 2.5V reference footprint |
| ADR3412ARJZ-R7 | Fixed 1.2V output; 0.1% initial accuracy; 30ppm/°C tempco; 100µA–10mA range; SC70-4 package | Higher accuracy and lower drift, but 1.2V output differs by 25mV; SC70-4 requires different land pattern | Choose ADR3412ARJZ-R7 only when tighter tolerance and lower drift justify redesign for 1.2V and SC70-4 layout |
Compared with TLVH431ACDBVR and ADR3412ARJZ-R7, LM4041CIM3-1.2+ offers exact 1.225V output in compact SOT23-3 with zero external components - making it optimal for space-constrained, fixed-voltage reference applications where 0.5% accuracy suffices.
Availability
LM4041CIM3-1.2+ is available at Aetrix Electronics and suitable for portable medical sensors, notebook system monitoring, and industrial data acquisition requiring stable component supply, RoHS-compliant packaging, and consistent lead-time performance.
Supply support for LM4041CIM3-1.2+ 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, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The LM4041 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems requiring stable, low-drift, capacitor-free voltage references at 1.225V.
FAQ
What is the exact output voltage tolerance of LM4041CIM3-1.2+ at +25°C?
The LM4041CIM3-1.2+ has a reverse breakdown voltage of 1.225V with ±6.0mV (±0.5%) tolerance at +25°C, as specified in the Electrical Characteristics table for grade C devices. This tolerance is guaranteed by laser trimming and verified during 100% production testing at room temperature.
Does LM4041CIM3-1.2+ require an external output capacitor for stability?
No, LM4041CIM3-1.2+ does not require an external output capacitor. Its internal design ensures stability with any capacitive load from 0 to at least 10µF, eliminating the need for external compensation components and reducing PCB area and BOM cost.
What is the minimum operating current for reliable regulation of LM4041CIM3-1.2+?
The LM4041CIM3-1.2+ requires a minimum shunt current of 60µA to maintain regulation across its full temperature range (-40°C to +85°C). Below this current, output voltage may deviate beyond specification, especially at temperature extremes.
Can LM4041CIM3-1.2+ be used in applications requiring operation above +85°C?
No - LM4041CIM3-1.2+ is rated only for -40°C to +85°C operation. For extended temperature range, select LM4041CEM3-1.2+ (–40°C to +125°C) or LM4041CIM3-1.2+T with appropriate derating analysis; the "C" grade suffix combined with "I" temperature code explicitly limits its qualified range.
How is pin 3 configured on LM4041CIM3-1.2+?
Pin 3 of LM4041CIM3-1.2+ is designated N.C. (no connection) and must be left floating or connected to pin 2 (cathode). It has no internal circuitry and connecting it elsewhere may compromise device reliability or specification compliance.
LM4041CIM3-1.2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 12 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 60 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4041CIM3-1.2+ FAQ
1.How can I place an order for LM4041CIM3-1.2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041CIM3-1.2+ 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 LM4041CIM3-1.2+ reliable?
The price and inventory of LM4041CIM3-1.2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041CIM3-1.2+ is usually 5 days.
3.What payment methods are accepted for LM4041CIM3-1.2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041CIM3-1.2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041CIM3-1.2+?
LM4041CIM3-1.2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041CIM3-1.2+ 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 LM4041CIM3-1.2+?
For technical support, including LM4041CIM3-1.2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041CIM3-1.2+ requirements.
6.How does Aetrix verify that LM4041CIM3-1.2+ is sourced from the original manufacturer or authorized distributors?
All LM4041CIM3-1.2+ 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 LM4041CIM3-1.2+ meets industry standards.
7.What is the process for return or replacement of LM4041CIM3-1.2+?
All LM4041CIM3-1.2+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4041CIM3-1.2+, 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 LM4041CIM3-1.2+ part is unused and in its original packaging.
Return procedure for LM4041CIM3-1.2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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