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STMicroelectronics LM4040DECT-2.0
- Part No.:
- LM4040DECT-2.0
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040DECT-2.0.pdf
- Description:
- IC VREF SHUNT 2.048V 5TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,237
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Product details
Overview
LM4040DECT-2.0 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 2.048 V output with ±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 optimized for space-constrained, battery-powered data acquisition and portable instrumentation.
For engineers reviewing the LM4040DECT-2.0 datasheet, LM4040DECT-2.0 pinout, LM4040DECT-2.0 application, or LM4040DECT-2.0 equivalent, key selection criteria include shunt reference stability under capacitive loads, low-frequency noise (10 µVp-p), thermal hysteresis (120 ppm), and SOT323-5L package compatibility with high-density PCB layouts.
Technical Context
The LM4040DECT-2.0 functions as a two-terminal shunt reference, regulating voltage by sinking adjustable cathode current (10 µA to 15 mA) while maintaining precise reverse breakdown behavior. Its bandgap-based core ensures monotonic temperature response and minimal drift over industrial temperature extremes.
It exhibits stable operation with capacitive loads up to 1 µF (per Figure 11), features low dynamic impedance (0.15–0.3 Ω), and delivers typ. 10 µVp-p low-frequency noise (0.1 Hz to 10 Hz) - critical for high-resolution ADC biasing and sensor signal conditioning circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; ±1% tolerance (LM4040D grade) at 25 °C - enables direct interface with 12-bit ADCs requiring ≤5 mV absolute error. |
| Initial Accuracy | ±1% (LM4040D); verified at 25 °C with 100% production test - eliminates need for post-assembly calibration in cost-sensitive systems. |
| Temp. Coefficient | ≤70 ppm/°C over –40 to +125 °C - ensures <±0.15% output shift across full industrial range, supporting unheated outdoor sensors. |
| Operating Current | 10 µA min., 15 mA max. - allows use in ultra-low-power wake-up circuits and energy-harvesting nodes with microamp-level budget. |
| Low-Freq Noise | 10 µVp-p (0.1–10 Hz) - minimizes added uncertainty in precision weigh-scale or thermocouple amplifier front-ends. |
| Thermal Hysteresis | 120 ppm - limits voltage shift after thermal cycling, improving repeatability in field-deployed test equipment. |
| Dynamic Impedance | 0.15–0.3 Ω - maintains regulation stability despite rapid load transients in DAC reference buffers. |
Pinout & Package
LM4040DECT-2.0 is housed in a 5-pin SOT323-5L package (3 active terminals + 2 NC pins). The NC pins (pins 2 and 5) must remain unconnected or tied to anode per datasheet guidance. This compact 2.0 × 2.2 mm outline supports high-density routing and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Reference output node | Sinks regulated current; connects to feedback network of external series pass element or ADC reference input. |
| Anode (Pin 3) | Ground reference terminal | Provides return path; must be low-impedance to avoid ground bounce-induced error in mixed-signal systems. |
| NC (Pin 2) | No-connect terminal | Electrically isolated; leave floating or tie to anode - no routing required, simplifies layout and avoids parasitic coupling. |
| NC (Pin 5) | No-connect terminal | Same function as Pin 2; dual NC structure accommodates mechanical symmetry in SOT323-5L mold design. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with capacitive loads | Validated stable up to 1 µF (Figure 11); eliminates need for external isolation resistors in decoupled reference designs. |
| Ultra-low operating current | 10 µA minimum; enables >10-year battery life in coin-cell-powered IoT sensors with periodic ADC sampling. |
| Low-frequency noise performance | 10 µVp-p (0.1–10 Hz); reduces effective number of bits (ENOB) degradation in 24-bit delta-sigma ADC applications. |
| Industrial temperature range | –40 to +125 °C operation; qualified for under-hood automotive modules and factory-floor PLC analog inputs. |
| High precision grading | D-grade (±1%) offers optimal balance of cost and performance for industrial control loop references where ±5 mV error is acceptable. |
Applications
| Portable Data Loggers | Medical Sensor Interfaces |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature/humidity every 5 minutes using a 16-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.048 V reference for ADC conversion, directly biased from system rail via current-limiting resistor. Use Value: 10 µA quiescent current extends CR2032 battery life beyond 3 years; ±1% accuracy meets Class I measurement requirements per IEC 62304. |
Use Scenario: Wearable ECG front-end with 24-bit delta-sigma ADC sampling at 1 kHz. IC Role / Device Role / Timing Role: Low-noise voltage reference for programmable gain amplifier (PGA) offset calibration and ADC reference. Use Value: 10 µVp-p low-frequency noise prevents baseline wander artifacts; SOT323-5L footprint saves space in sub-20 mm² wearable PCBs. |
| Smart Industrial Transmitters | Automotive Cabin Sensors |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in ambient temperatures from –25 to +85 °C. IC Role / Device Role / Timing Role: Precision shunt reference establishing excitation voltage for bridge sensor and ADC reference simultaneously. Use Value: 70 ppm/°C tempco ensures <±0.08% full-scale error over operating range; stable with 100 nF local decoupling per Figure 9. |
Use Scenario: Occupancy detection module using infrared thermopile sensor in vehicle cabin, powered from 5 V rail. IC Role / Device Role / Timing Role: Reference source for thermopile signal conditioning amplifier and 12-bit internal MCU ADC. Use Value: Qualified to –40 to +125 °C; 120 ppm thermal hysteresis prevents false triggers after repeated hot/cold cycling during vehicle park-use 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 typical IQ | Requires external resistor divider; higher current draw limits battery life in always-on sensing | Choose when adjustable output or tighter initial accuracy justifies higher power and BOM count. |
| MAX6008AEUR+T | Fixed 2.048 V, ±0.1% accuracy, 20 ppm/°C tempco, 35 µA IQ, SOT23-3 | Higher precision and lower tempco but 3.5× higher operating current and no NC pins for layout flexibility | Choose for metrology-grade instruments where 0.1% accuracy outweighs power and package constraints. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040DECT-2.0 provides the optimal trade-off of ultra-low power (10 µA), industry-standard 2.048 V output, and SOT323-5L's dual-NC layout advantage - making it preferred for space- and energy-constrained industrial edge nodes.
Availability
LM4040DECT-2.0 is available at Aetrix Electronics and suitable for portable data loggers, medical sensor interfaces, and smart industrial transmitters requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LM4040DECT-2.0 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, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
LM4040 belongs to ST's precision analog portfolio, engineered specifically for high-stability, low-power voltage referencing in harsh-environment measurement systems where accuracy, size, and energy efficiency are co-constrained.
FAQ
What is the maximum capacitive load the LM4040DECT-2.0 can drive without oscillation?
Per Figure 11 in DS13886 Rev 4, LM4040DECT-2.0 remains stable with capacitive loads up to 1 µF when operating at 10–15 mA cathode current. Stability is confirmed across –40 to +125 °C; loads exceeding 1 µF require series isolation resistance per application note AN4432.
Can the NC pins on the SOT323-5L package be grounded?
No - pins 2 and 5 are designated "NC" (no connect) and must either remain unconnected or be tied to the anode (pin 3), as explicitly stated in the datasheet. Grounding them risks altering internal thermal distribution and may degrade long-term voltage stability or tempco performance.
How does the 10 µA minimum operating current affect circuit design?
The 10 µA minimum (at 25 °C, Vk < 2.5 V) defines the lowest usable cathode current before regulation collapses. Designers must ensure the current-limiting resistor and supply voltage maintain ≥10 µA across all temperature and voltage corners - e.g., at 2.2 V supply and –40 °C, Ikmin rises to 12 µA per Table 3.
Is LM4040DECT-2.0 compatible with lead-free reflow profiles?
Yes - LM4040DECT-2.0 is qualified for lead-free soldering with a maximum lead temperature of 260 °C for 10 seconds (Table 1), compliant with IPC/JEDEC J-STD-020D. The SOT323-5L package uses ECOPACK2-compliant materials meeting RoHS and REACH requirements.
LM4040DECT-2.0 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):
- 2.048V
- 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 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323-5
LM4040DECT-2.0 FAQ
1.How can I place an order for LM4040DECT-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DECT-2.0 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 LM4040DECT-2.0 reliable?
The price and inventory of LM4040DECT-2.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DECT-2.0 is usually 5 days.
3.What payment methods are accepted for LM4040DECT-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DECT-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DECT-2.0?
LM4040DECT-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DECT-2.0 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 LM4040DECT-2.0?
For technical support, including LM4040DECT-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DECT-2.0 requirements.
6.How does Aetrix verify that LM4040DECT-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4040DECT-2.0 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 LM4040DECT-2.0 meets industry standards.
7.What is the process for return or replacement of LM4040DECT-2.0?
All LM4040DECT-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DECT-2.0, 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 LM4040DECT-2.0 part is unused and in its original packaging.
Return procedure for LM4040DECT-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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