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STMicroelectronics LM4041DILT-1.2
- Part No.:
- LM4041DILT-1.2
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4041DILT-1.2.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3L
- Quantity:
- Payment:
- Shipping:
Inventory:3,731
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Product details
Overview
LM4041DILT-1.2 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 1.225 V output with ±1% initial accuracy at 25 °C, 40 µA operating current, and 100 ppm/°C max temperature coefficient in SOT23-3L package. It serves as a compact, low-power voltage reference in battery-operated instrumentation and energy management systems where space and quiescent current are critical.
For engineers reviewing the LM4041DILT-1.2 datasheet, LM4041DILT-1.2 pinout, LM4041DILT-1.2 application, or LM4041DILT-1.2 equivalent, key selection criteria include output tolerance, thermal drift, minimum cathode current, capacitive load stability, and SOT23-3L footprint compatibility in low-power analog signal chains.
Technical Context
The LM4041DILT-1.2 operates as a two-terminal shunt reference: cathode and anode pins regulate voltage by sinking adjustable current through an external resistor. Its bandgap-based core achieves ±1% initial accuracy and maintains regulation across -40 °C to +85 °C industrial temperature range.
It exhibits ultra-low 40 µA minimum operating current and remains stable with capacitive loads up to 1 µF-enabling direct use with ADC reference inputs or op-amp bias networks without series isolation resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225 V nominal; ±1% tolerance at 25 °C ensures predictable reference level for 12-bit ADCs without trimming. |
| Initial Accuracy | ±1% (LM4041D grade); tighter than 0.2% and 0.5% variants but optimized for cost-sensitive industrial designs. |
| Temp Coefficient | ≤100 ppm/°C; limits reference drift to <1.2 mV over full -40 to +85 °C range. |
| Operating Current | 40 µA min; enables operation from high-value bias resistors (>30 kΩ @ 5 V), reducing power in always-on circuits. |
| Load Stability | Stable with ≥0 pF to 1 µF capacitive loads; eliminates need for series damping resistor in sensor front-ends. |
| Junction Temp Max | +150 °C; supports reliable operation in thermally constrained PCB layouts near power stages. |
Pinout & Package
LM4041DILT-1.2 is housed in a 3-pin SOT23-3L surface-mount package (JEDEC TO-236AB). Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC (no connect; must be left floating or tied to Anode for improved noise immunity).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Reference output node | Sinks regulated current; connects to top of bias resistor and load (e.g., ADC REF+ input). |
| Pin 2 (Anode) | Ground reference terminal | Connects to system ground; forms return path for cathode current and defines reference potential. |
| Pin 3 (NC) | No internal connection | Must remain unconnected or tied to Pin 2 (Anode) per ST layout guidance to reduce EMI susceptibility. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low operating current | 40 µA typical at 25 °C enables >10-year battery life in coin-cell-powered data loggers. |
| Capacitive load stability | Operates stably with 0–1 µF output capacitance-eliminates need for series resistor in precision sensor buffers. |
| Industrial temperature range | -40 °C to +85 °C operation supports deployment in outdoor metering and factory automation equipment. |
| Low long-term drift | 120 ppm after 1000 hours ensures reference stability in calibration-critical instrumentation without periodic recalibration. |
Applications
| Battery-Powered Data Acquisition | Switch-Mode Power Supply Feedback |
|---|---|
Use Scenario: Portable environmental sensor node measuring temperature and humidity with 12-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for ADC conversion, replacing larger three-terminal references to save board area. Use Value: 40 µA quiescent current extends CR2032 battery life beyond 5 years; SOT23-3L footprint fits tight 8 mm² sensor module layout. | Use Scenario: Isolated flyback converter using optocoupler feedback with TL431 replacement. IC Role / Device Role / Timing Role: Shunt reference generating precise error voltage at primary-side controller feedback node. Use Value: ±1% tolerance ensures ±2% output voltage regulation; 100 ppm/°C TC avoids thermal-induced output drift across ambient conditions. |
| Energy Management System Monitoring | Portable Instrumentation Calibration |
Use Scenario: Smart electricity meter monitoring line voltage, current, and power factor via multi-channel ADC. IC Role / Device Role / Timing Role: Supplies common reference for all ADC channels to maintain inter-channel gain matching. Use Value: Low 120 ppm/1000h drift preserves meter accuracy certification over 10-year field lifetime without field recalibration. | Use Scenario: Handheld multimeter requiring traceable DC voltage reference for self-calibration routine. IC Role / Device Role / Timing Role: On-board precision reference used during factory and field calibration against NIST-traceable standards. Use Value: 1.225 V output matches standard 1.2 V reference ladder ratios; ±1% grade balances cost and metrology-grade repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431IDBZR | Adjustable output (2.5 V min), 80 µA min cathode current, ±0.5% initial accuracy | Requires external resistor divider; less suitable for fixed 1.225 V use without added components | Select when design requires programmable reference or higher accuracy at cost premium |
| MAX6008AEUR+T | Fixed 1.25 V output, 35 µA min current, ±0.2% initial accuracy, SOT23-3 | Higher accuracy but 25 mV higher nominal voltage; may require circuit re-biasing | Select when tighter tolerance justifies voltage shift and higher BOM cost |
Compared with TLVH431IDBZR and MAX6008AEUR+T, LM4041DILT-1.2 offers optimal balance of fixed 1.225 V output, ultra-low 40 µA current, and SOT23-3L compatibility-making it ideal for space-constrained, battery-powered industrial sensors where exact voltage alignment and minimal power overhead are prioritized.
Availability
LM4041DILT-1.2 is available at Aetrix Electronics and suitable for battery-operated equipment, energy management systems, and portable instrumentation requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4041DILT-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 silicon solutions for automotive, industrial, and consumer markets since 1987.
The LM4041 series belongs to ST's precision analog portfolio, engineered specifically for low-power, high-stability voltage referencing in space- and energy-constrained embedded systems-not general-purpose ICs.
FAQ
What is the minimum cathode current required for regulation at -40 °C?
The LM4041DILT-1.2 requires 50 µA minimum cathode current at -40 °C to maintain regulation, per Table 3 in the datasheet. This increases from the 40 µA typical value at 25 °C due to increased bandgap core leakage at cold temperatures.
Can LM4041DILT-1.2 drive a 10 nF capacitor directly without oscillation?
Yes. The LM4041DILT-1.2 is explicitly characterized for stability with capacitive loads from 0 pF up to 1 µF (1000 nF), so a 10 nF capacitor poses no risk of oscillation and may improve high-frequency noise rejection at the reference node.
Is pin 3 internally connected or truly unconnected?
Pin 3 is a true no-connect (NC) terminal with no internal bond wire or silicon connection. ST recommends leaving it floating or tying it to pin 2 (Anode) solely to reduce PCB layout sensitivity to noise coupling-no electrical function is added by this connection.
How does the 100 ppm/°C temperature coefficient translate to voltage drift over its operating range?
Over the -40 °C to +85 °C range (125 °C span), the maximum drift is calculated as 100 ppm/°C × 1.225 V × 125 °C = 15.3 mV. Thus, output voltage stays within 1.2097 V to 1.2403 V across full industrial temperature range.
LM4041DILT-1.2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- ±1%
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4041DILT-1.2 FAQ
1.How can I place an order for LM4041DILT-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4041DILT-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 LM4041DILT-1.2 reliable?
The price and inventory of LM4041DILT-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 LM4041DILT-1.2 is usually 5 days.
3.What payment methods are accepted for LM4041DILT-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4041DILT-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4041DILT-1.2?
LM4041DILT-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4041DILT-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 LM4041DILT-1.2?
For technical support, including LM4041DILT-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4041DILT-1.2 requirements.
6.How does Aetrix verify that LM4041DILT-1.2 is sourced from the original manufacturer or authorized distributors?
All LM4041DILT-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 LM4041DILT-1.2 meets industry standards.
7.What is the process for return or replacement of LM4041DILT-1.2?
All LM4041DILT-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4041DILT-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 LM4041DILT-1.2 part is unused and in its original packaging.
Return procedure for LM4041DILT-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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