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STMicroelectronics LM4040AELT-3.0
- Part No.:
- LM4040AELT-3.0
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040AELT-3.0.pdf
- Description:
- IC VREF SHUNT 3V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,831
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Product details
Overview
LM4040AELT-3.0 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 3.0 V output with ±0.1% initial accuracy at 25 °C, 70 ppm/°C max temperature coefficient, and ultra-low 10 µA operating current. It operates across –40 to +125 °C and is used in high-resolution ADC biasing, portable sensor signal conditioning, and battery-powered data loggers where low quiescent current and tight voltage tolerance are critical.
For engineers reviewing the LM4040AELT-3.0 datasheet, LM4040AELT-3.0 pinout, LM4040AELT-3.0 application, or LM4040AELT-3.0 equivalent, key selection factors include its 3.0 V fixed output, SOT23-3L package footprint, 10 µA minimum regulation current, and 10 µVp-p low-frequency noise performance in space-constrained industrial systems.
Technical Context
The LM4040AELT-3.0 functions as a two-terminal shunt reference, sinking current to maintain a precise 3.0 V cathode-to-anode voltage under varying load and supply conditions. Its bandgap-based core achieves ±0.1% initial accuracy and 70 ppm/°C tempco without external trimming.
It exhibits stable operation with capacitive loads up to 1 µF and maintains regulation down to 10 µA-enabling use in ultra-low-power systems. The device's 0.3 Ω typical dynamic impedance and 10 µVp-p (0.1–10 Hz) noise support high-precision analog front-ends requiring minimal voltage drift and ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000 V ±0.003 V at 25 °C - enables direct biasing of 12-bit+ SAR ADC references without gain calibration. |
| Initial Accuracy | ±0.1% (A-grade) - eliminates need for system-level voltage trimming in factory-calibrated instrumentation. |
| Tempco | ≤70 ppm/°C - ensures <±0.21 mV drift over –40 to +125 °C, critical for outdoor sensor nodes. |
| Operating Current | 10 µA min / 15 mA max - supports coin-cell operation for >10-year battery life in wireless sensors. |
| Low-Frequency Noise | 10 µVp-p (0.1–10 Hz) - preserves SNR in precision weigh-scale and medical ECG front-ends. |
| Dynamic Impedance | 0.3 Ω typ. - minimizes output voltage shift under transient load changes in multiplexed data acquisition. |
| Thermal Hysteresis | 120 ppm - guarantees repeatable voltage after thermal cycling in automotive under-hood modules. |
Pinout & Package
SOT23-3L package: 3-pin surface-mount, 2.9 mm × 1.3 mm × 1.0 mm body, 0.95 mm lead pitch, RoHS-compliant ECOPACK2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Reference Output Node | Connected to regulated 3.0 V node; sinks current to maintain voltage; requires series resistor from supply. |
| Anode (Pin 2) | Ground Reference | Return path for reference current; must be low-impedance connection to system ground plane. |
| NC (Pin 3) | No Connect | Internally unconnected; must remain floating or tied to anode per datasheet guidance to avoid parametric shift. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.0 V output | Eliminates external resistor network; reduces BOM count and layout area in compact PCBs. |
| 10 µA minimum operating current | Enables direct integration with nano-power microcontrollers (e.g., STM32L0/L4) in always-on wake-up circuits. |
| Stable with capacitive loads ≤1 µF | Permits local decoupling without oscillation risk-no external compensation required in portable designs. |
| 70 ppm/°C max tempco | Meets Class A accuracy requirements for industrial temperature transmitters per IEC 61293. |
| 10 µVp-p LF noise | Supports 24-bit delta-sigma ADCs (e.g., ADS1262) without additional filtering or chopper stabilization. |
Applications
| Portable Gas Detectors | Industrial Pressure Transmitters |
|---|---|
Use Scenario: Battery-powered handheld unit measuring CO/H2S via electrochemical cell with 16-bit ADC. IC Role / Device Role / Timing Role: Shunt reference for ADC VREF input and sensor biasing circuit. Use Value: 10 µA quiescent current extends 2xAA alkaline battery life to >2 years; ±0.1% accuracy ensures <0.5% full-scale measurement error. |
Use Scenario: 4–20 mA loop-powered pressure sensor operating in oil-field enclosures (–40 to +85 °C). IC Role / Device Role / Timing Role: Precision voltage reference for bridge amplifier offset nulling and ADC reference. Use Value: 70 ppm/°C tempco limits reference drift to <±0.17 mV over operating range-within transmitter's 0.1% FS error budget. |
| Medical Patient Monitor Front-End | Smart Electricity Meter ADC Reference |
Use Scenario: Low-noise ECG signal chain with programmable gain amplifier and 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Low-noise 3.0 V reference for PGA and ADC, replacing noisier bandgap ICs. Use Value: 10 µVp-p LF noise prevents baseline wander and preserves diagnostic waveform fidelity below 0.5 Hz. |
Use Scenario: Polyphase energy meter using metrology SoC (e.g., ADE7912) with integrated 2.4 V reference. IC Role / Device Role / Timing Role: External 3.0 V reference for auxiliary analog monitoring channels (voltage sag, THD). Use Value: ±0.1% initial accuracy and 120 ppm hysteresis ensure consistent calibration across meter lifecycle and thermal cycles. |
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 (2.5 V min), ±0.5% initial accuracy, 100 ppm/°C tempco, 80 µA min current | Requires two external resistors; higher current draw increases power loss in battery systems | Select when adjustable output or higher current capability (>15 mA) is needed; not drop-in for fixed 3.0 V. |
| MAX6003AEUR+T | Fixed 3.0 V, ±0.2% accuracy, 75 ppm/°C tempco, 12 µA min current, SOT23-3 | Looser initial tolerance and higher min current reduce accuracy margin in high-end instrumentation | Acceptable for cost-sensitive industrial controls where ±0.2% meets spec; verify thermal hysteresis (not published). |
Compared with TLVH431ACDBVR and MAX6003AEUR+T, the LM4040AELT-3.0 delivers superior initial accuracy (±0.1% vs. ±0.2–0.5%), lower operating current (10 µA vs. 12–80 µA), and guaranteed thermal hysteresis (120 ppm), making it optimal for battery-critical, high-accuracy measurement systems.
Availability
LM4040AELT-3.0 is available at Aetrix Electronics and suitable for portable gas detectors, industrial pressure transmitters, and medical patient monitor front-ends requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040AELT-3.0 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, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.
The LM4040 series belongs to ST's precision analog portfolio, designed specifically for high-accuracy, low-power shunt reference applications in harsh-environment instrumentation and portable electronics.
FAQ
What is the minimum cathode current required for regulation at –40 °C?
At –40 °C, the LM4040AELT-3.0 requires 15 µA minimum cathode current to maintain regulation, per Table 3 of DS13886 Rev 4. This is higher than the 10 µA specified at 25 °C due to increased bandgap curvature effects at low temperature.
Can the NC pin (Pin 3) be left floating in SOT23-3L layout?
Yes-the NC pin in the SOT23-3L package may be left unconnected, but ST recommends connecting it to the anode (Pin 2) if routing density permits, as this improves thermal stability and reduces potential parametric variation under mechanical stress.
Is the LM4040AELT-3.0 qualified for automotive applications?
No-LM4040AELT-3.0 is rated for industrial temperature range (–40 to +125 °C) but is not AEC-Q200 qualified. For automotive use, ST offers the pin-compatible LM4040Q series with extended reliability testing and PPAP documentation.
How does capacitive load affect stability, and what is the maximum safe value?
The LM4040AELT-3.0 remains stable with capacitive loads up to 1 µF, as confirmed by Figure 11 (Stability Plane vs. COUT) in DS13886 Rev 4. Loads beyond 1 µF risk oscillation unless damped with a series resistor (≥10 Ω) between cathode and capacitor.
LM4040AELT-3.0 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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 70ppm/°C
- Noise - 0.1Hz to 10Hz:
- 10µVp-p
- Noise - 10Hz to 10kHz:
- 95µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 25 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040AELT-3.0 FAQ
1.How can I place an order for LM4040AELT-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AELT-3.0 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 LM4040AELT-3.0 reliable?
The price and inventory of LM4040AELT-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AELT-3.0 is usually 5 days.
3.What payment methods are accepted for LM4040AELT-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AELT-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AELT-3.0?
LM4040AELT-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AELT-3.0 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 LM4040AELT-3.0?
For technical support, including LM4040AELT-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AELT-3.0 requirements.
6.How does Aetrix verify that LM4040AELT-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4040AELT-3.0 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 LM4040AELT-3.0 meets industry standards.
7.What is the process for return or replacement of LM4040AELT-3.0?
All LM4040AELT-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AELT-3.0, 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 LM4040AELT-3.0 part is unused and in its original packaging.
Return procedure for LM4040AELT-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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