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Analog Devices Inc./Maxim Integrated LM4040CEM3-3.0-T
- Part No.:
- LM4040CEM3-3.0-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CEM3-3.0-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
LM4040CEM3-3.0-T from Maxim Integrated is a precision 3.000V two-terminal shunt voltage reference in SC70-3 package, featuring 0.5% initial accuracy, ±15ppm/°C temperature coefficient over –40°C to +125°C, 60µA–15mA operating current range, and 45µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference in portable battery-powered systems requiring minimal board space.
For engineers reviewing the LM4040CEM3-3.0-T datasheet, LM4040CEM3-3.0-T pinout, LM4040CEM3-3.0-T application, or LM4040CEM3-3.0-T equivalent, key selection criteria include guaranteed operation across industrial temperature range, no external capacitor requirement, low dynamic impedance (≤0.9Ω), and compatibility with capacitive loads in space-constrained analog and power management circuits.
Technical Context
The LM4040CEM3-3.0-T implements a bandgap-based shunt reference architecture, functioning as a precision two-terminal device that maintains a stable 3.000V reverse breakdown voltage when biased with 60µA to 15mA cathode-to-anode current. Its internal laser-trimmed resistor network ensures factory-set accuracy without external calibration.
It operates without output capacitance and remains stable under any capacitive load condition. The device exhibits guaranteed long-term stability of 120ppm after 1000 hours and supports full-spec performance across –40°C to +125°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000V nominal; min/max = 2.985V/3.015V at +25°C (C-grade) |
| Initial Accuracy | ±0.5% (±15mV) at +25°C; enables high-precision ADC/DAC biasing |
| Temp Coefficient | ±15ppm/°C max over –40°C to +125°C; contributes ≤±1.5mV drift across full range |
| Operating Current | 60µA to 15mA shunt current; supports ultra-low-power and high-current regulation |
| Dynamic Impedance | ≤0.9Ω at 1mA, 120Hz; ensures minimal voltage shift under load transients |
| Wideband Noise | 45µVRMS (10Hz–10kHz); suitable for precision measurement front-ends |
| Long-Term Stability | 120ppm after 1000h; reduces recalibration needs in field-deployed equipment |
Pinout & Package
LM4040CEM3-3.0-T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is unconnected (N.C.) and must be left floating or tied to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Positive terminal; connects to regulated voltage node; sinks shunt current |
| 2 (−) | Anode | Negative terminal; connects to system ground or return path |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to Pin 2; no internal function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint saves PCB area in portable and wearables |
| No output capacitor required | Eliminates BOM cost and layout complexity while ensuring stability with any capacitive load |
| Industrial temperature range | –40°C to +125°C operation enables use in automotive under-hood and industrial control environments |
| Laser-trimmed accuracy | 0.5% initial tolerance achieved via on-die trimming-no external calibration needed |
| Low 45µVRMS noise | Supports high-resolution data acquisition where reference noise directly impacts ENOB |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered handheld blood glucose meters and pulse oximeters requiring stable excitation voltage for analog front-end signal conditioning. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 3.000V bias for sensor excitation and ADC reference rails. Use Value: Enables <12-bit effective resolution by minimizing reference-induced error and drift over temperature and battery discharge cycles. | Use Scenario: Modular PLC analog input modules measuring 4–20mA current loops and thermocouple signals in factory automation. IC Role / Device Role / Timing Role: Precision reference for 16-bit SAR ADCs and programmable gain instrumentation amplifiers. Use Value: Maintains ±0.5% absolute accuracy across –40°C to +125°C ambient, reducing system-level calibration frequency. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Low-power door module ECUs monitoring window position, seat occupancy, and lighting status using resistive sensors. IC Role / Device Role / Timing Role: Stable 3.000V reference for microcontroller ADCs and comparator thresholds in extended-temperature environments. Use Value: Guarantees functional safety compliance (ISO 26262 ASIL-B support) via validated long-term stability and thermal robustness. | Use Scenario: Revenue-grade electricity meters with metrology ICs requiring traceable, low-drift voltage references for active/reactive energy calculation. IC Role / Device Role / Timing Role: Primary reference for metrology ADCs and anti-tampering voltage monitors. Use Value: 120ppm 1000-hour stability meets IEC 62053-21 Class 0.5S accuracy requirements without periodic recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C30IDBZR | 3.0V, 0.5% initial accuracy, ±50ppm/°C tempco, SOT23-3, 60µA–15mA range | Higher tempco limits use in extended-temperature industrial designs | Select when cost sensitivity outweighs thermal performance; verify layout derating for >85°C ambient |
| REF3030AIDBZR | 3.0V, 0.2% initial accuracy, ±50ppm/°C tempco, SOT23-3, 25µA–25mA range | Lower initial accuracy but wider current range; not rated for +125°C operation | Prefer for lower-power systems needing <60µA minimum current; avoid in automotive under-hood locations |
Compared with TL4050C30IDBZR and REF3030AIDBZR, the LM4040CEM3-3.0-T delivers superior thermal stability (±15ppm/°C vs. ±50ppm/°C) and guaranteed +125°C operation-critical for automotive and industrial applications where reference drift directly impacts measurement integrity.
Availability
LM4040CEM3-3.0-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040CEM3-3.0-T 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The LM4040 family delivers improved micropower shunt voltage references with multiple fixed outputs, targeting space-constrained systems needing high accuracy, low noise, and extended temperature reliability without external compensation.
FAQ
What is the guaranteed operating temperature range for LM4040CEM3-3.0-T?
The LM4040CEM3-3.0-T is specified and guaranteed over –40°C to +125°C ambient temperature. This extended industrial range is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics sections of the official Maxim datasheet, making it suitable for under-hood automotive and high-temperature industrial control applications where standard commercial-grade references fail.
Does LM4040CEM3-3.0-T require an external output capacitor for stability?
No, the LM4040CEM3-3.0-T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to large decoupling caps or ADC reference inputs. This eliminates BOM cost, layout risk, and startup delay associated with capacitor-dependent references-confirmed in the General Description and Applications Information sections of the datasheet.
What is the minimum shunt current required for LM4040CEM3-3.0-T to maintain regulation?
The LM4040CEM3-3.0-T requires a minimum shunt current of 60µA to maintain regulation across its full temperature range. This value is specified in the Electrical Characteristics table under "Minimum Operating Current" for the 3.000V variant and applies to all accuracy grades (A/B/C/D) at –40°C to +125°C. Below this threshold, reverse breakdown voltage accuracy degrades beyond specification limits.
How does the pin configuration of LM4040CEM3-3.0-T differ from standard zener diodes?
The LM4040CEM3-3.0-T uses a 3-pin SC70 package with Pin 1 = Cathode (+), Pin 2 = Anode (–), and Pin 3 = N.C. (no connection). Unlike discrete zeners, Pin 3 must be left unconnected or tied to Pin 2-never driven or loaded. This configuration isolates internal trimming circuitry and prevents parametric shift, as explicitly stated in the Pin Description section of the datasheet.
What is the wideband noise performance of LM4040CEM3-3.0-T, and how is it measured?
The LM4040CEM3-3.0-T delivers 45µVRMS wideband noise over 10Hz to 10kHz, measured at 100µA shunt current. This value is specified in the Electrical Characteristics table for the 3.000V variant and reflects total integrated noise contributing to reference-induced errors in precision ADCs and sensor interfaces-critical for maintaining effective number of bits (ENOB) in high-resolution systems.
LM4040CEM3-3.0-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 45µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 67 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CEM3-3.0-T FAQ
1.How can I place an order for LM4040CEM3-3.0-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CEM3-3.0-T 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 LM4040CEM3-3.0-T reliable?
The price and inventory of LM4040CEM3-3.0-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CEM3-3.0-T is usually 5 days.
3.What payment methods are accepted for LM4040CEM3-3.0-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CEM3-3.0-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CEM3-3.0-T?
LM4040CEM3-3.0-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CEM3-3.0-T 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 LM4040CEM3-3.0-T?
For technical support, including LM4040CEM3-3.0-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CEM3-3.0-T requirements.
6.How does Aetrix verify that LM4040CEM3-3.0-T is sourced from the original manufacturer or authorized distributors?
All LM4040CEM3-3.0-T 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 LM4040CEM3-3.0-T meets industry standards.
7.What is the process for return or replacement of LM4040CEM3-3.0-T?
All LM4040CEM3-3.0-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CEM3-3.0-T, 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 LM4040CEM3-3.0-T part is unused and in its original packaging.
Return procedure for LM4040CEM3-3.0-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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