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Analog Devices Inc./Maxim Integrated LM4040CEX3-5.0+
- Part No.:
- LM4040CEX3-5.0+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040CEX3-5.0+.pdf
- Description:
- LM4040 IMPROVED PRECISION MICROP
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
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Product details
Overview
LM4040CEX3-5.0+ from Maxim Integrated is a precision 5.000V, two-terminal shunt voltage reference in SC70-3 package with ±0.5% initial accuracy, 100ppm/°C max temperature coefficient, and guaranteed operation from –40°C to +125°C. It delivers stable reverse-breakdown voltage across 60μA–15mA shunt current and supports space-constrained battery-powered systems requiring high-accuracy analog sensing or ADC reference.
For engineers reviewing the LM4040CEX3-5.0+ datasheet, LM4040CEX3-5.0+ pinout, LM4040CEX3-5.0+ application, or LM4040CEX3-5.0+ equivalent, key selection criteria include its 5.000V nominal output, SC70-3 footprint compatibility, wide operating current range, low 80µVRMS noise (10Hz–10kHz), and no-output-capacitor stability-critical for portable instrumentation and industrial sensor front-ends.
Technical Context
The LM4040CEX3-5.0+ uses bandgap-based shunt regulation to maintain a precise 5.000V reverse breakdown voltage without external components. Its internal laser-trimmed resistor network ensures ±0.5% initial tolerance at +25°C, and it achieves ±1.15% total overtemperature tolerance across –40°C to +125°C per grade C specifications.
It operates as a two-terminal device: cathode (Pin 1) sinks current while anode (Pin 2) connects to ground or return path; Pin 3 is NC and must remain unconnected or tied to Pin 2. Dynamic impedance remains ≤1.1Ω at 1mA/120Hz, enabling fast load-transient response with minimal voltage deviation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V nominal; ±25mV (±0.5%) tolerance at +25°C - enables direct use as 5V ADC reference or DAC bias without trimming. |
| Temperature Coefficient | ≤100ppm/°C - ensures ≤±5.75mV drift over full –40°C to +125°C range, critical for automotive and industrial calibration. |
| Operating Current Range | 60μA to 15mA - supports ultra-low-power sleep modes and high-current regulation in same design. |
| Wideband Noise | 80µVRMS (10Hz–10kHz) - low enough for 12-bit+ precision data acquisition without additional filtering. |
| Dynamic Impedance | ≤1.1Ω at 1mA/120Hz - minimizes output voltage shift during rapid load changes in sensor signal chains. |
| Long-Term Stability | 120ppm after 1000h - ensures reference integrity over product lifetime without recalibration. |
| Package | SC70-3 (1.8mm × 1.8mm) - 50% smaller than SOT23, ideal for wearables and compact IoT nodes. |
Pinout & Package
LM4040CEX3-5.0+ is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm, 0.95mm height). Pin 3 is No Connection (NC) and must be left floating or tied to Pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Cathode | Current-sink terminal; connects to regulated voltage node (e.g., ADC VREF input); reverse-biased during operation. |
| Pin 2 (–) | Anode | Ground/reference return path; forms shunt loop with Pin 1; must be low-impedance connection to system ground. |
| Pin 3 (N.C.) | No Connection | Internally unconnected; must remain unconnected or shorted to Pin 2 - violation risks parametric deviation or failure. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - reduces PCB real estate by 50% vs. SOT23, enabling high-density portable designs. |
| No output capacitor required | Stable with any capacitive load up to ≥1µF - eliminates BOM cost, layout complexity, and startup delay from external caps. |
| Guaranteed –40°C to +125°C operation | Qualified for extended industrial and automotive ambient environments - supports under-hood and factory-floor deployments. |
| Low 80µVRMS noise | Enables <12-bit effective resolution in precision measurement systems without post-regulation filtering. |
| 60μA minimum operating current | Supports micropower sleep states (e.g., 100nA system standby with periodic wake-up) while maintaining reference integrity. |
Applications
| Portable Medical Sensors | Industrial Process Transmitters |
|---|---|
|
Use Scenario: Battery-powered handheld blood glucose meter with 12-bit ADC sampling analog sensor output. IC Role / Device Role / Timing Role: Precision 5.000V shunt reference for ADC VREF input, establishing absolute voltage scale for glucose concentration calculation. Use Value: ±0.5% initial accuracy and ≤100ppm/°C drift ensure <±0.6% full-scale error across operating temperature, meeting ISO 15197 clinical accuracy requirements. |
Use Scenario: 4–20mA loop-powered pressure transmitter deployed in chemical plant control cabinets. IC Role / Device Role / Timing Role: Stable 5.000V reference for signal conditioning amplifier and DAC used in current-loop modulation circuitry. Use Value: Guaranteed –40°C to +125°C operation and 120ppm long-term stability eliminate field recalibration needs over 10-year service life. |
| Automotive Cabin Sensors | Smart Energy Meters |
|
Use Scenario: Occupancy detection module using MEMS accelerometer and microcontroller in vehicle cabin. IC Role / Device Role / Timing Role: Shunt reference supplying stable 5.000V to MCU's internal ADC and analog comparator for low-power wake-on-motion detection. Use Value: 60μA min operating current enables <1µA system sleep current; SC70-3 size fits tight dashboard PCB constraints. |
Use Scenario: DIN-rail mounted electricity meter measuring grid voltage/current with metrology-grade accuracy. IC Role / Device Role / Timing Role: Primary reference for polyphase energy measurement IC (e.g., ADE78xx) requiring stable 5V supply for analog front-end and reference buffers. Use Value: 80µVRMS noise and ≤1.1Ω dynamic impedance prevent gain/offset errors in Class 0.2 metering compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C50IDBZR | 5.0V, ±0.5%, SC70-3, 100ppm/°C, but requires ≥75μA min current and exhibits higher 120µVRMS noise. | Less suitable for ultra-low-power wake-up circuits due to higher minimum current; higher noise limits 14-bit+ metrology use. | Select TL4050C50IDBZR only if TI supply chain preference exists and noise/current margins allow. |
| ADR3450ARJZ-R7 | 5.0V, ±0.1%, SOT23-3, 30ppm/°C, but larger footprint and requires 200μA min current; not rated beyond +105°C. | Better accuracy/tempco for lab-grade instruments, but incompatible with space-constrained +125°C environments like engine control units. | Choose ADR3450ARJZ-R7 when 0.1% accuracy is mandatory and SC70 size/extended temp are not required. |
Compared with TL4050C50IDBZR and ADR3450ARJZ-R7, LM4040CEX3-5.0+ uniquely balances SC70-3 size, –40°C to +125°C rating, 60μA min current, and 80µVRMS noise-making it optimal for compact, rugged, battery-aware industrial and automotive sensors.
Availability
LM4040CEX3-5.0+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial process transmitters, automotive cabin sensors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040CEX3-5.0+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and medical applications, emphasizing reliability, small form factor, and low power.
The LM4040 family delivers micropower shunt references optimized for space-constrained, high-accuracy systems where stability, low noise, and extended temperature operation are essential - especially in battery-powered and harsh-environment instrumentation.
FAQ
What is the guaranteed operating temperature range for LM4040CEX3-5.0+?
The LM4040CEX3-5.0+ is specified and guaranteed over –40°C to +125°C ambient temperature. This extended range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet, making it suitable for under-hood automotive and industrial control cabinet applications where thermal stress is significant.
Can LM4040CEX3-5.0+ operate without an external output capacitor?
Yes, LM4040CEX3-5.0+ does not require an external output capacitor for stability and remains stable with any capacitive load, including 0pF to ≥1µF. This is explicitly stated in the General Description and Applications Information sections, eliminating BOM cost and layout risk associated with capacitor selection and placement.
What is the minimum shunt current required for LM4040CEX3-5.0+ to maintain regulation?
The LM4040CEX3-5.0+ requires a minimum shunt current of 60μA to maintain regulation across its full temperature range. This value is specified in the Electrical Characteristics table for the 5.000V version under "Minimum Operating Current" (IRMIN) for grades A/B/C, and is validated for stable 5.000V output at –40°C and +125°C.
How does the noise performance of LM4040CEX3-5.0+ compare to other 5V shunt references?
LM4040CEX3-5.0+ delivers 80µVRMS wideband noise (10Hz–10kHz), measured at 100μA operating current. This is lower than TL4050C50IDBZR (120µVRMS) and competitive with higher-cost references - enabling direct use in 12-bit precision systems without added filtering, as confirmed in the Electrical Characteristics table on page 7.
Is Pin 3 of LM4040CEX3-5.0+ functional or should it be left unconnected?
Pin 3 of LM4040CEX3-5.0+ is designated N.C. (No Connection) and must be left unconnected or tied to Pin 2 (anode) per the Pin Configuration diagram and Pin Description section. Connecting Pin 3 to any other node may cause parametric deviation or functional failure, as explicitly warned in the datasheet.
LM4040CEX3-5.0+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040CEX3-5.0+ FAQ
1.How can I place an order for LM4040CEX3-5.0+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CEX3-5.0+ 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 LM4040CEX3-5.0+ reliable?
The price and inventory of LM4040CEX3-5.0+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CEX3-5.0+ is usually 5 days.
3.What payment methods are accepted for LM4040CEX3-5.0+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CEX3-5.0+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CEX3-5.0+?
LM4040CEX3-5.0+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CEX3-5.0+ 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 LM4040CEX3-5.0+?
For technical support, including LM4040CEX3-5.0+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CEX3-5.0+ requirements.
6.How does Aetrix verify that LM4040CEX3-5.0+ is sourced from the original manufacturer or authorized distributors?
All LM4040CEX3-5.0+ 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 LM4040CEX3-5.0+ meets industry standards.
7.What is the process for return or replacement of LM4040CEX3-5.0+?
All LM4040CEX3-5.0+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CEX3-5.0+, 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 LM4040CEX3-5.0+ part is unused and in its original packaging.
Return procedure for LM4040CEX3-5.0+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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