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Texas Instruments LM4040DEM3-2.5
- Part No.:
- LM4040DEM3-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040DEM3-2.5.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,217
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Product details
Overview
LM4040DEM3-2.5 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a stable 2.5 V reverse breakdown voltage with ±20 mV (±0.8%) initial tolerance at 25°C, 100 ppm/°C max temperature coefficient, and 35 μVrms wideband noise (10 Hz–10 kHz). It operates from 65 μA to 15 mA over −40°C to +125°C and requires no output capacitor-used for ADC/DAC biasing and sensor excitation in portable instrumentation.
For engineers reviewing the LM4040DEM3-2.5 datasheet, LM4040DEM3-2.5 pinout, LM4040DEM3-2.5 application, or LM4040DEM3-2.5 equivalent, key selection criteria include industrial/automotive-grade shunt reference performance, low-current stability down to 65 μA, thermal hysteresis ≤0.08%, dynamic impedance ≤1.1 Ω, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040DEM3-2.5 uses Zener-zap trimmed bandgap architecture with curvature-corrected temperature drift compensation, enabling stable 2.5 V reference across −40°C to +125°C. Its shunt topology sinks current through the cathode to regulate voltage at the anode node, requiring only an external series resistor for biasing.
It achieves 100 ppm/°C max tempco via on-chip curvature correction and maintains <1.1 Ω dynamic impedance at 1 mA, ensuring minimal load regulation error (<10 mV over 1 mA–15 mA). Thermal hysteresis is specified at 0.08% after cycling between −40°C and +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage; sets precise bias point for analog signal chains. |
| Initial Tolerance | ±20 mV (±0.8%) at 25°C; enables high-accuracy calibration without trimming in production test. |
| Tempco | ≤100 ppm/°C max; ensures ≤±19 mV total drift over −40°C to +125°C (ΔT = 100°C). |
| Operating Current | 65 μA min to 15 mA max; supports ultra-low-power sensor nodes and robust industrial operation. |
| Noise (10 Hz–10 kHz) | 35 μVrms; preserves SNR in 16-bit+ data acquisition systems without added filtering. |
| Dynamic Impedance | ≤1.1 Ω at 1 mA; minimizes output voltage shift under varying load current conditions. |
| Thermal Hysteresis | 0.08% (≈2 mV); guarantees repeatability after thermal cycling in automotive or outdoor equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, gull-wing leads, JEDEC standard footprint. Anode grounded, cathode supplies regulated voltage, NC pin (pin 3) must be left floating or tied to anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current sink / output node | Connected to supply rail via series resistor; voltage at this node is regulated to 2.5 V. |
| Anode (Pin 2) | Reference ground return | Must be connected to system ground; defines 0 V reference for output voltage. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; leave floating or tie to Pin 2 (anode) per TI recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Zener-zap trimmed accuracy | Ensures ±20 mV initial tolerance without post-package calibration or external trimming. |
| Capacitive-load stability | Operates stably with any capacitive load (e.g., ADC input caps), eliminating need for series resistance or isolation. |
| No output capacitor required | Reduces BOM count and PCB area in space-constrained designs like wearables and IoT sensors. |
| AEC-Q100 Grade 1 qualified | Validated for automotive applications up to +125°C ambient, supporting engine control and ADAS modules. |
| Low micropower operation | 65 μA minimum operating current enables multi-year battery life in remote monitoring devices. |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and lithium coin-cell power. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V reference for ADC full-scale range. Use Value: Enables ±0.8% initial accuracy and <35 μVrms noise without external filtering or trimming, extending battery life beyond 5 years. |
Use Scenario: Industrial PLC analog input module measuring 4–20 mA sensor loops. IC Role / Device Role / Timing Role: Precision voltage reference for DAC-based current source and ADC reference buffer. Use Value: Maintains ≤±19 mV total voltage error over −40°C to +85°C, meeting IEC 61000-6-2 immunity requirements. |
| Automotive Sensor Nodes | Energy Management ICs |
Use Scenario: Tire pressure monitoring system (TPMS) with MEMS pressure sensor and RF transceiver. IC Role / Device Role / Timing Role: Reference for ratiometric sensor excitation and ADC conversion in AEC-Q100-compliant design. Use Value: Delivers 0.08% thermal hysteresis and 100 ppm/°C tempco, ensuring repeatable pressure readings after vehicle thermal soak cycles. |
Use Scenario: Smart electricity meter with metrology SoC and isolated power supply. IC Role / Device Role / Timing Role: Secondary reference for anti-tampering voltage monitoring circuitry. Use Value: Stable 2.5 V output under 15 mA load enables reliable detection of supply rail anomalies without false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040CIM3-2.5 | ±10 mV (±0.4%) initial tolerance, 100 ppm/°C tempco, same SOT-23-3 package | Higher accuracy grade for lab-grade instrumentation; not AEC-Q100 qualified | Select when tighter initial tolerance is required and automotive qualification is unnecessary. |
| TL431ACDBVR | Adjustable 2.495 V reference, 2% initial tolerance, higher 0.2 Ω typical dynamic impedance | Requires two external resistors for 2.5 V setting; lower accuracy but wider current range (1 mA–100 mA) | Choose for cost-sensitive industrial controls where ±2% tolerance is acceptable and higher drive capability is needed. |
Compared with LM4040CIM3-2.5 and TL431ACDBVR, the LM4040DEM3-2.5 offers AEC-Q100 Grade 1 qualification and optimized micropower operation (65 μA min), making it uniquely suited for automotive and battery-powered applications demanding both reliability and ultra-low quiescent current.
Availability
LM4040DEM3-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor nodes, energy management ICs, and industrial data acquisition systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4040DEM3-2.5 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and automotive-grade component validation.
The LM4040-N product line delivers micropower shunt references optimized for space-constrained, battery-operated, and safety-critical applications-including automotive, industrial sensing, and portable test equipment-where low drift, low noise, and high reliability are essential.
FAQ
What is the maximum operating temperature range for the LM4040DEM3-2.5?
The LM4040DEM3-2.5 is rated for operation from −40°C to +125°C ambient temperature and is AEC-Q100 Grade 1 qualified. This extended range supports under-hood automotive applications and industrial environments where junction temperatures may reach 125°C. The device maintains its 2.5 V reference accuracy and 100 ppm/°C max temperature coefficient across this full range.
Does the LM4040DEM3-2.5 require an external output capacitor?
No, the LM4040DEM3-2.5 does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC input capacitors or long PCB traces. This eliminates BOM components and layout constraints common with other shunt references, simplifying design for space-limited applications.
What is the minimum operating current for the LM4040DEM3-2.5?
The LM4040DEM3-2.5 has a minimum operating current of 65 μA at 25°C and 68 μA over the full −40°C to +125°C temperature range. This micropower capability enables use in always-on sensor nodes powered by coin cells or energy harvesters, while maintaining 2.5 V regulation within ±20 mV initial tolerance and ≤100 ppm/°C tempco.
How is pin 3 (NC) used in the LM4040DEM3-2.5 SOT-23 package?
In the LM4040DEM3-2.5 SOT-23 (DBZ) package, pin 3 is a no-connect terminal. Texas Instruments specifies that it must either be left floating or tied directly to pin 2 (anode). It is not internally bonded and serves no electrical function-incorrect routing (e.g., connecting to cathode or leaving unterminated in high-noise environments) may risk mechanical stress or contamination during assembly.
What is the thermal hysteresis specification for the LM4040DEM3-2.5?
The LM4040DEM3-2.5 has a thermal hysteresis of 0.08% (approximately 2 mV for the 2.5 V output), measured as the voltage difference at 25°C after cycling between −40°C and +125°C. This low hysteresis ensures repeatable reference performance in applications subject to repeated thermal cycling, such as automotive ECUs and outdoor environmental monitors.
LM4040DEM3-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 73 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040DEM3-2.5 FAQ
1.How can I place an order for LM4040DEM3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEM3-2.5 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 LM4040DEM3-2.5 reliable?
The price and inventory of LM4040DEM3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEM3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040DEM3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEM3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEM3-2.5?
LM4040DEM3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEM3-2.5 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 LM4040DEM3-2.5?
For technical support, including LM4040DEM3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEM3-2.5 requirements.
6.How does Aetrix verify that LM4040DEM3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040DEM3-2.5 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 LM4040DEM3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040DEM3-2.5?
All LM4040DEM3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEM3-2.5, 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 LM4040DEM3-2.5 part is unused and in its original packaging.
Return procedure for LM4040DEM3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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