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Analog Devices Inc./Maxim Integrated LM4041CEX3-1.2+T
- Part No.:
- LM4041CEX3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4041CEX3-1.2+T.pdf
- Description:
- IC VREF SHUNT 1.225V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:1,932
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Product details
Overview
LM4041CEX3-1.2+T from Maxim Integrated is a precision 1.225V two-terminal shunt voltage reference in SC70-3 package, rated for -40°C to +125°C operation, with 0.5% initial accuracy, 100ppm/°C max temperature coefficient, and 60µA–12mA operating current range-used in battery-powered instrumentation and industrial sensor signal conditioning.
For engineers reviewing the LM4041CEX3-1.2+T datasheet, LM4041CEX3-1.2+T pinout, LM4041CEX3-1.2+T application, or LM4041CEX3-1.2+T equivalent, key selection criteria include guaranteed high-temp performance, no-output-capacitor stability, low noise (20µVRMS), and subminiature SC70 footprint compatibility with space-constrained PCB layouts.
Technical Context
The LM4041CEX3-1.2+T implements a bandgap-based shunt reference architecture delivering a fixed 1.225V reverse breakdown voltage across its anode and cathode terminals. It operates as a two-terminal device requiring only external series resistance to regulate output voltage under varying load and supply conditions.
Its internal BiCMOS process enables stable regulation from 60µA minimum shunt current up to 12mA, with dynamic impedance ≤1.5Ω at 1mA and wideband noise of 20µVRMS (10Hz–10kHz). Pin 3 is unconnected or tied to pin 2 per design specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal; ±6.0mV tolerance at +25°C ensures precise ADC/DAC biasing in 12-bit systems. |
| Initial Accuracy | ±0.5% (C-grade); guarantees reference error ≤6.125mV at room temperature for calibration-critical circuits. |
| Temp Coefficient | ≤100ppm/°C; limits drift to ±12.25mV over full -40°C to +125°C range for industrial-grade stability. |
| Operating Current | 60µA to 12mA; supports ultra-low-power sensor nodes and high-current analog front-ends without redesign. |
| Noise (10Hz–10kHz) | 20µVRMS; minimizes quantization uncertainty in precision 16-bit SAR ADC references. |
| Dynamic Impedance | ≤1.5Ω at 1mA; maintains <0.15mV output shift under 1mA load transients for stable feedback loops. |
| Temperature Range | -40°C to +125°C; qualified for under-hood automotive sensors and factory-floor process controllers. |
Pinout & Package
LM4041CEX3-1.2+T uses the 3-pin SC70-3 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23-3, with exposed pad not electrically connected. Thermal derating is 2.17mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connected to system ground or low-impedance return path; forms cathode-to-anode voltage reference node. |
| 2 (−) | Cathode (negative terminal) | Connected to regulated output node; sinks shunt current to maintain 1.225V across terminals. |
| 3 (N.C.) | No-connect terminal | Must be left floating or shorted to pin 2; no internal connection-omitting this risks layout-induced leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | Enables placement in <2mm² board area-critical for wearable medical sensors and compact IoT modules. |
| No external capacitor required | Eliminates BOM cost and layout risk for stability; remains stable with any capacitive load up to 10µF. |
| Low 20µVRMS noise | Reduces effective number of bits (ENOB) degradation in high-resolution data acquisition systems. |
| Wide 60µA–12mA current range | Supports single-reference use across sleep-mode microcontrollers and active analog signal chains. |
| Laser-trimmed resistor network | Ensures 0.5% initial accuracy without post-assembly calibration-reducing test time and NRE costs. |
Applications
| Portable Medical Sensors | Industrial Temperature Transmitters |
|---|---|
Use Scenario: Battery-powered pulse oximeter with 16-bit ADC measuring weak photodiode currents. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225V reference for ADC and op-amp gain-setting resistors. Use Value: 0.5% accuracy and 100ppm/°C TC ensure <±0.5°C measurement error across -10°C to +50°C ambient. | Use Scenario: 4–20mA loop-powered RTD transmitter mounted near furnace exhaust ducts. IC Role / Device Role / Timing Role: Precision voltage reference for excitation current generation and ADC reference in HART-enabled field device. Use Value: -40°C to +125°C rating and 20µVRMS noise enable reliable 0.1% span accuracy in harsh thermal environments. |
| Automotive Cabin Air Quality Modules | Programmable Logic Controller Analog Inputs |
Use Scenario: Compact CO₂/NVOC sensor module integrated into vehicle HVAC control unit. IC Role / Device Role / Timing Role: Two-terminal shunt reference powering electrochemical sensor bias and ADC reference rail. Use Value: SC70-3 size allows co-location with sensor IC on 4-layer 10mm × 10mm PCB; no capacitor simplifies layout. | Use Scenario: DIN-rail mounted PLC with isolated 0–10V analog input channels for motor drive feedback. IC Role / Device Role / Timing Role: Stable reference source for precision 24-bit sigma-delta ADC front-end with galvanic isolation. Use Value: 60µA min current enables operation during brownout conditions; 12mA capability supports multiple channel referencing. |
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 | 2.5V adjustable output (via resistors); 0.5% initial accuracy; 100ppm/°C TC; SOT23-3 package. | Requires two external resistors to set 1.225V; higher minimum cathode current (80µA). | Select when existing designs already use TLVH431 and board space permits resistor addition. |
| REF3012AIDBZR | 1.2V fixed output; 0.2% initial accuracy; 50ppm/°C TC; SC70-3 package; 50µA–25mA range. | Higher accuracy and lower TC but 8mV lower nominal voltage; requires output capacitor for stability. | Select when tighter voltage tolerance (<±2.4mV) and lower drift (<±6.25mV over temp) justify added capacitor and cost. |
Compared with TLVH431ACDBVR and REF3012AIDBZR, the LM4041CEX3-1.2+T delivers exact 1.225V without external components, operates down to 60µA, and eliminates capacitor dependency-making it optimal for minimal-footprint, zero-component-count reference designs in extended temperature environments.
Availability
LM4041CEX3-1.2+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial temperature transmitters, and automotive cabin air quality modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4041CEX3-1.2+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, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The LM4041 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-reliability systems where accuracy, temperature stability, and zero-component stability are critical.
FAQ
What is the exact output voltage tolerance of LM4041CEX3-1.2+T at +25°C?
The LM4041CEX3-1.2+T has a reverse breakdown voltage of 1.225V with ±6.0mV tolerance at +25°C (0.5% of 1.225V), corresponding to a range of 1.219V to 1.231V. This is specified in the Electrical Characteristics table for the C-grade variant under VR parameter at TA = +25°C.
Does LM4041CEX3-1.2+T require an external output capacitor for stability?
No, the LM4041CEX3-1.2+T does not require an external output capacitor and remains stable with any capacitive load. This is confirmed in both the General Description and Applications Information sections, which state "no output capacitors required" and "stable for any output capacitance."
What is the maximum operating temperature range for LM4041CEX3-1.2+T?
The LM4041CEX3-1.2+T is rated for continuous operation from -40°C to +125°C, as indicated by the "E" suffix in the ordering code and explicitly stated in the Ordering Information table and Absolute Maximum Ratings section.
How is pin 3 used on LM4041CEX3-1.2+T?
Pin 3 of the LM4041CEX3-1.2+T is labeled N.C. (No Connect) and must be left floating or connected to pin 2 (cathode). The Pin Description section states this explicitly, and Figure 3 confirms no internal connection exists-incorrect handling may introduce leakage or instability.
What shunt current range ensures regulation for LM4041CEX3-1.2+T?
The LM4041CEX3-1.2+T maintains stable regulation across a shunt current range of 60µA to 12mA. Below 60µA, regulation degrades; above 12mA, performance is not guaranteed and absolute maximum ratings (20mA) must not be exceeded.
LM4041CEX3-1.2+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):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4041CEX3-1.2+T FAQ
1.How can I place an order for LM4041CEX3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041CEX3-1.2+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 LM4041CEX3-1.2+T reliable?
The price and inventory of LM4041CEX3-1.2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4041CEX3-1.2+T is usually 5 days.
3.What payment methods are accepted for LM4041CEX3-1.2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041CEX3-1.2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041CEX3-1.2+T?
LM4041CEX3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041CEX3-1.2+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 LM4041CEX3-1.2+T?
For technical support, including LM4041CEX3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041CEX3-1.2+T requirements.
6.How does Aetrix verify that LM4041CEX3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4041CEX3-1.2+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 LM4041CEX3-1.2+T meets industry standards.
7.What is the process for return or replacement of LM4041CEX3-1.2+T?
All LM4041CEX3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4041CEX3-1.2+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 LM4041CEX3-1.2+T part is unused and in its original packaging.
Return procedure for LM4041CEX3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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