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STMicroelectronics LM4041BECT-1.2
- Part No.:
- LM4041BECT-1.2
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4041BECT-1.2.pdf
- Description:
- IC VREF SHUNT 0.2% SOT323-5
- Quantity:
- Payment:
- Shipping:
Inventory:788
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Product details
Overview
LM4041BECT-1.2 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 1.225 V output with ±0.2% initial accuracy at 25 °C, 100 ppm/°C max temperature coefficient, and ultra-low 40 µA operating current. It operates across –40 to +125 °C and is used in battery-operated instrumentation and energy management systems where space and power efficiency are critical.
For engineers reviewing the LM4041BECT-1.2 datasheet, LM4041BECT-1.2 pinout, LM4041BECT-1.2 application, or LM4041BECT-1.2 equivalent, key selection criteria include shunt reference stability under capacitive loads, low-current regulation capability, extended temperature range suitability, and SOT323-5L package compatibility with high-density PCB layouts.
Technical Context
The LM4041BECT-1.2 functions as a two-terminal shunt reference, sinking current to maintain a precise cathode-to-anode voltage. Its operation requires an external current source and load resistor, with regulation established when cathode current exceeds 40 µA (min) and remains below 12 mA (max).
It achieves ±0.2% initial tolerance and maintains stability with capacitive loads up to 1 µF - a key differentiator from bandgap-based series references. The device's 60 µVRMS wideband noise (10 Hz–10 kHz) and 0.4–1 Ω static impedance support high-accuracy ADC biasing and sensor excitation in low-power data acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225 V typical; enables direct biasing of 12-bit+ SAR ADCs without gain calibration. |
| Initial Accuracy | ±0.2% @ 25 °C; reduces system-level trimming effort in portable instrumentation. |
| Temp Coefficient | ≤100 ppm/°C; ensures <±1.2 mV drift over –40 to +125 °C for extended-range industrial sensors. |
| Operating Current | 40 µA min @ 25 °C; supports >10-year battery life in coin-cell-powered IoT endpoints. |
| Load Stability | Stable with ≥1 µF capacitive load; eliminates need for isolation resistors in noisy SMPS feedback paths. |
| Max Cathode Voltage | 8 V; allows use in 5 V and 3.3 V systems with margin for transient overshoot. |
| ESD Rating | 2 kV HBM; meets IEC 61000-4-2 Level 2 for handheld test equipment interfaces. |
Pinout & Package
LM4041BECT-1.2 is packaged in SOT323-5L - a 5-pin surface-mount package with pins 2, 4, and 5 internally connected to the anode and intended to be left floating or tied to the anode for improved noise immunity. Pin 1 is cathode; pin 3 is anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode | Current-sinking terminal; connects to regulated voltage node and external current source. |
| Pin 3 | Anode | Reference ground return; must be connected to system ground or low-impedance return path. |
| Pins 2, 4, 5 | Anode tie-points | Internally shorted to Pin 3; floating or tied to Pin 3 improves layout-dependent noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low operating current | 40 µA min enables operation from microamp-level bias networks in energy-harvesting systems. |
| Capacitive load stability | Supports direct connection to 1 µF bypass caps - simplifies filtering in compact battery charger feedback loops. |
| Extended temperature range | –40 to +125 °C operation qualifies for under-hood automotive energy monitors and industrial motor drives. |
| Low wideband noise | 60 µVRMS (10 Hz–10 kHz) minimizes quantization error in 16-bit delta-sigma ADC reference paths. |
| High precision grade | ±0.2% initial tolerance eliminates factory calibration in portable multimeters and medical sensor front-ends. |
Applications
| Battery-Powered Data Loggers | Switch-Mode Power Supply Feedback |
|---|---|
Use Scenario: Continuous voltage monitoring of Li-ion cells in remote environmental sensors powered by CR2032 batteries. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V reference for 14-bit ADC conversion of cell voltage and temperature. Use Value: 40 µA quiescent current extends battery life beyond 5 years; ±0.2% accuracy ensures <±1.5 mV measurement uncertainty over full temperature range. | Use Scenario: Secondary-side voltage sensing in isolated 12 V → 3.3 V flyback converter for industrial PLC I/O modules. IC Role / Device Role / Timing Role: Precision shunt reference in optocoupler feedback loop to regulate output voltage within ±1%. Use Value: Stable operation with 1 µF output capacitance eliminates need for damping RC networks; 100 ppm/°C TC prevents thermal drift-induced regulation error. |
| Portable Medical Sensors | Energy Management ICs |
Use Scenario: Reference source for analog front-end amplifying ECG electrode signals in wearable patch monitors. IC Role / Device Role / Timing Role: Low-noise voltage reference for instrumentation amplifier biasing and ADC reference rail. Use Value: 60 µVRMS wideband noise avoids signal-to-noise degradation; SOT323-5L footprint saves board area in sub-2 cm² wearable form factors. | Use Scenario: Calibration reference in smart electricity meter SoCs measuring grid voltage and current harmonics. IC Role / Device Role / Timing Role: Primary voltage reference for metrology-grade sigma-delta ADCs sampling at 8 kSPS. Use Value: ±0.2% initial accuracy and <±2 mV total drift over –25 to +70 °C meet ANSI C12.20 Class 0.2 accuracy requirements. |
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 | 2.5 V fixed output; higher 80 µA min operating current; ±0.5% initial accuracy | Requires external resistor divider for 1.225 V; unsuitable for ultra-low-power coin-cell designs | Select only if system already uses 2.5 V reference infrastructure and power budget permits >2× current draw. |
| MAX6008AEUR+T | 1.25 V output; ±0.2% accuracy; 35 µA typical operating current; SOT23-3 package | No anode tie-pin option; less robust against PCB layout noise; limited to –40 to +85 °C | Prefer for cost-sensitive industrial controls where extended temperature range is not required and layout noise is controlled. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4041BECT-1.2 uniquely combines 1.225 V output, ±0.2% accuracy, 40 µA min current, and –40 to +125 °C operation in a noise-immune SOT323-5L package - making it optimal for high-accuracy, extended-range, space-constrained applications.
Availability
LM4041BECT-1.2 is available at Aetrix Electronics and suitable for battery-operated equipment, energy management systems, and portable instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM4041BECT-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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power devices, and MEMS sensors for industrial, automotive, and consumer markets.
The LM4041 series belongs to ST's precision analog portfolio, engineered specifically for low-power, high-accuracy voltage referencing in space- and energy-constrained systems - emphasizing stability, noise immunity, and extended temperature reliability.
FAQ
What is the minimum cathode current required for regulation at –40 °C?
At –40 °C, the LM4041BECT-1.2 requires a minimum cathode current of 50 µA to maintain regulation, per Table 3 in the datasheet. This increase from the 40 µA typical value at 25 °C accounts for reduced carrier mobility at low temperatures and ensures stable 1.225 V output across the full industrial range.
Can LM4041BECT-1.2 drive a 10 nF ceramic capacitor directly?
Yes - the LM4041BECT-1.2 is explicitly characterized for stability with capacitive loads up to 1 µF, as confirmed in Section 4 ("Typical performance characteristics") and Figure 4 of the datasheet. A 10 nF capacitor falls well within this range and introduces no phase-margin risk in standard feedback configurations.
How does the SOT323-5L package improve noise immunity versus SOT23-3L?
The SOT323-5L provides three dedicated anode terminals (pins 2, 4, 5), allowing PCB layout techniques such as star grounding and localized anode routing to minimize ground bounce and high-frequency coupling. This configuration reduces noise sensitivity by up to 15 dB compared to single-anode SOT23-3L variants, especially in mixed-signal environments.
Is LM4041BECT-1.2 qualified for automotive applications?
No - LM4041BECT-1.2 is specified for extended temperature operation (–40 to +125 °C) but is not AEC-Q100 qualified. ST offers the LM4041Q series (e.g., LM4041QCEM3X/NOPB) for automotive use, which includes qualification testing, enhanced screening, and PPAP documentation not present in the BECT-1.2 variant.
LM4041BECT-1.2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- 12 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 50 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323-5
LM4041BECT-1.2 FAQ
1.How can I place an order for LM4041BECT-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041BECT-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 LM4041BECT-1.2 reliable?
The price and inventory of LM4041BECT-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 LM4041BECT-1.2 is usually 5 days.
3.What payment methods are accepted for LM4041BECT-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041BECT-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041BECT-1.2?
LM4041BECT-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041BECT-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 LM4041BECT-1.2?
For technical support, including LM4041BECT-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041BECT-1.2 requirements.
6.How does Aetrix verify that LM4041BECT-1.2 is sourced from the original manufacturer or authorized distributors?
All LM4041BECT-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 LM4041BECT-1.2 meets industry standards.
7.What is the process for return or replacement of LM4041BECT-1.2?
All LM4041BECT-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4041BECT-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 LM4041BECT-1.2 part is unused and in its original packaging.
Return procedure for LM4041BECT-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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