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STMicroelectronics LM4040DELT-2.5
- Part No.:
- LM4040DELT-2.5
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DELT-2.5.pdf
- Description:
- IC VREF SHUNT 2.5V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:502
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Product details
Overview
LM4040DELT-2.5 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 2.5 V output with ±1% initial accuracy at 25 °C, 70 ppm/°C max temperature coefficient, and ultra-low 10 µA operating current - enabling use in space-constrained, battery-powered instrumentation and data acquisition systems.
For engineers reviewing the LM4040DELT-2.5 datasheet, LM4040DELT-2.5 pinout, LM4040DELT-2.5 application, or LM4040DELT-2.5 equivalent, key selection criteria include low-current regulation capability (10 µA min), low-frequency noise (10 µVp-p), capacitive-load stability, and SOT23-3L package compatibility for high-density PCB layouts.
Technical Context
The LM4040DELT-2.5 operates as a two-terminal shunt reference, sinking current to maintain a precise 2.5 V cathode-to-anode voltage across its terminals. Its bandgap-based core achieves ±1% tolerance over –40 °C to +125 °C with no external components required.
It exhibits 0.15–0.3 Ω static impedance and <4 mV voltage shift across 10 µA–15 mA operating current range, ensuring minimal load regulation error in precision ADC biasing and sensor excitation circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal; ±1% initial accuracy (LM4040D grade) at 25 °C - defines absolute reference for 12-bit+ ADCs without trimming. |
| Operating Current | 10 µA minimum, 15 mA maximum - enables operation from micro-power sources like coin cells or energy-harvesting nodes. |
| Temp Coefficient | ≤70 ppm/°C - limits drift to ±0.21 V over full –40 °C to +125 °C range, critical for industrial-grade measurement stability. |
| Low-Freq Noise | 10 µVp-p (0.1–10 Hz) - preserves signal integrity in high-resolution weigh-scale and strain-gauge front-ends. |
| Dynamic Impedance | 0.15–0.3 Ω - minimizes output voltage perturbation during transient load changes in closed-loop reference buffers. |
| Thermal Hysteresis | 120 ppm - ensures repeatable voltage after thermal cycling, essential for calibration-critical test equipment. |
Pinout & Package
LM4040DELT-2.5 is supplied in the SOT23-3L surface-mount package (3-pin, 2.9 mm × 1.3 mm footprint), optimized for automated assembly and thermal performance (RthJA = 210 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reference Output Terminal | Sinks current to maintain 2.5 V between Cathode and Anode; connects to ADC REF+ or op-amp inverting input. |
| 2 (Anode) | Current Return Path | Connects to system ground or negative rail; forms reference loop with cathode and series resistor. |
| 3 (NC) | No Connect | Internally unconnected; must remain floating or tied to Anode per datasheet guidance to avoid parametric shift. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.5 V Output | Eliminates need for external resistive divider or trimming in portable multimeters and handheld analyzers. |
| 10 µA Operating Current | Extends battery life >10× vs. legacy references, enabling 5+ year operation in wireless sensor nodes. |
| Stable with Capacitive Loads | Supports direct connection to 1 µF bypass caps without oscillation - simplifies layout in noisy motor-control enclosures. |
| Industrial Temp Range | Guaranteed performance from –40 °C to +125 °C - suitable for under-hood automotive sensors and factory-floor PLC modules. |
| Low LF Noise (10 µVp-p) | Enables sub-16-bit ENOB in sigma-delta ADCs used in medical ECG front-ends and precision thermometry. |
Applications
| Portable Multimeter Reference | Data Acquisition Channel Reference |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for autoranging ADC and LCD driver bias. IC Role / Device Role / Timing Role: Shunt voltage reference providing primary scaling voltage for 16-bit SAR ADC and internal DAC calibration. Use Value: ±1% initial accuracy and 70 ppm/°C TC ensure <0.05% reading error across –10 °C to +50 °C operating range without firmware compensation. | Use Scenario: 8-channel industrial DAQ module measuring 4–20 mA sensor loops and thermocouples. IC Role / Device Role / Timing Role: Per-channel reference for programmable gain instrumentation amplifiers and 24-bit delta-sigma ADCs. Use Value: 10 µA quiescent current allows simultaneous reference biasing of all channels while maintaining <100 µA total system standby draw. |
| Wireless Sensor Node Bias | Automotive Cabin Pressure Sensor |
Use Scenario: Battery-powered IoT node monitoring HVAC duct pressure using MEMS differential sensor. IC Role / Device Role / Timing Role: Excitation source for Wheatstone bridge and reference for ratiometric ADC conversion. Use Value: Ultra-low 10 µA operating current extends CR2032 battery life to >3 years in sleep-active duty cycle (1 s active / 60 s sleep). | Use Scenario: Cabin pressure sensor in automotive climate control system exposed to under-dash temperatures up to +105 °C. IC Role / Device Role / Timing Role: Stable 2.5 V reference for bridge amplifier and ADC in AEC-Q200 qualified module. Use Value: Guaranteed operation at +125 °C junction temperature and 120 ppm thermal hysteresis enable repeatable calibration after thermal soak 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 |
|---|---|---|---|
| TLV431ACDBVR | Adjustable (1.24–6 V) via external resistor divider; 1.5% initial accuracy; 100 ppm/°C TC. | Requires two external resistors; less accurate and higher drift than LM4040DELT-2.5. | Select when design requires programmable reference voltage or cost sensitivity outweighs precision needs. |
| MAX6008AEUR+T | Fixed 2.5 V; 0.2% initial accuracy; 30 ppm/°C TC; 20 µA min operating current. | Higher accuracy and lower drift, but doubles minimum current requirement. | Select for metrology-grade instruments where 0.2% tolerance justifies added power budget and cost premium. |
Compared with TLV431ACDBVR and MAX6008AEUR+T, LM4040DELT-2.5 offers the optimal balance of fixed-voltage simplicity, ultra-low current consumption, and industrial-grade temperature stability - making it preferred for battery-operated field instruments and high-channel-count DAQ systems where board space and power are constrained.
Availability
LM4040DELT-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and automotive cabin sensor systems requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4040DELT-2.5 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 analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.
The LM4040 product line delivers precision micropower shunt references targeting space- and energy-constrained applications including portable test equipment, smart sensors, and battery-backed data loggers.
FAQ
What is the minimum operating current for LM4040DELT-2.5 at 25 °C?
The LM4040DELT-2.5 requires a minimum cathode current of 10 µA at 25 °C to maintain regulation, as specified in Table 3 of the DS13886 datasheet. Below this threshold, output voltage deviates beyond ±1% tolerance, impacting accuracy in low-power sensor biasing applications.
Can LM4040DELT-2.5 drive a 1 µF capacitive load without instability?
Yes - Figure 11 (Stability plane vs. COUT) in DS13886 confirms stable operation with up to 1 µF output capacitance at 10 µA–15 mA cathode current. This eliminates need for isolation resistors in noise-sensitive applications like precision ADC reference decoupling.
Is the NC pin on LM4040DELT-2.5 required to be left floating?
No - the NC pin (Pin 3) may be left unconnected or tied to the Anode (Pin 2), as explicitly stated in the datasheet note. Connecting it to Anode does not affect electrical performance and can improve mechanical reliability during reflow soldering.
How does the 70 ppm/°C temperature coefficient translate to voltage drift over temperature?
At 70 ppm/°C, LM4040DELT-2.5 drifts ≤0.175 mV/°C. Over the full –40 °C to +125 °C range (165 °C span), maximum drift is ±11.55 mV (±0.462% of 2.5 V), verified by Figure 2 in DS13886 for the 5 V version and scaled proportionally for 2.5 V.
LM4040DELT-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 70ppm/°C
- Noise - 0.1Hz to 10Hz:
- 10µVp-p
- Noise - 10Hz to 10kHz:
- 95µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 12 mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323-3
LM4040DELT-2.5 FAQ
1.How can I place an order for LM4040DELT-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DELT-2.5 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 LM4040DELT-2.5 reliable?
The price and inventory of LM4040DELT-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DELT-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040DELT-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DELT-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DELT-2.5?
LM4040DELT-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DELT-2.5 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 LM4040DELT-2.5?
For technical support, including LM4040DELT-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DELT-2.5 requirements.
6.How does Aetrix verify that LM4040DELT-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040DELT-2.5 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 LM4040DELT-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040DELT-2.5?
All LM4040DELT-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DELT-2.5, 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 LM4040DELT-2.5 part is unused and in its original packaging.
Return procedure for LM4040DELT-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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