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Analog Devices Inc./Maxim Integrated LM4040BEX3-5.0
- Part No.:
- LM4040BEX3-5.0
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040BEX3-5.0.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,332
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Product details
Overview
LM4040BEX3-5.0 from Maxim Integrated is a precision 5.000V two-terminal shunt voltage reference in SC70-3 package, featuring 0.2% initial accuracy, ±15ppm/°C temperature coefficient over –40°C to +125°C, 54µA minimum operating current, and 80µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference in high-accuracy ADC/DAC biasing, portable power monitoring, and industrial sensor signal conditioning circuits.
For engineers reviewing the LM4040BEX3-5.0 datasheet, LM4040BEX3-5.0 pinout, LM4040BEX3-5.0 application, or LM4040BEX3-5.0 equivalent, key selection criteria include guaranteed operation across –40°C to +125°C, no external capacitor requirement, low 0.5Ω dynamic impedance at 1mA, and compatibility with capacitive loads up to 1µF without instability.
Technical Context
The LM4040BEX3-5.0 implements a bandgap-based shunt reference architecture, functioning as a precision two-terminal device that maintains a stable 5.000V reverse breakdown voltage when biased with 54µA to 15mA shunt current. Its internal laser-trimmed resistor network ensures factory-calibrated accuracy without post-installation trimming.
It operates without an external stabilizing capacitor and remains stable under any capacitive load condition, including direct connection to ADC reference inputs or microcontroller VREF pins. The device's thermal design supports full specification compliance across its extended industrial temperature range (–40°C to +125°C) with ≤120ppm long-term stability after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V nominal; guaranteed 4.990V to 5.010V at +25°C for B-grade, enabling 12-bit ADC reference accuracy without calibration. |
| Initial Accuracy | ±0.2% (±10mV); ensures ≤10mV absolute error at room temperature for precision analog front-ends. |
| Temp Coefficient | ±15ppm/°C max; contributes ≤±0.75mV drift over –40°C to +125°C, critical for uncalibrated industrial sensors. |
| Shunt Current Range | 54µA to 15mA; supports ultra-low-power battery systems (e.g., 100µA standby) and high-current regulation (e.g., 10mA DAC bias). |
| Dynamic Impedance | 0.5Ω typical at 1mA; minimizes output voltage shift under load transients, preserving reference integrity in switching power supplies. |
| Wideband Noise | 80µVRMS (10Hz–10kHz); low enough for 16-bit SAR ADCs without additional filtering. |
| Long-Term Stability | 120ppm after 1000h; ensures <0.012% reference drift over 1 year in deployed equipment. |
Pinout & Package
LM4040BEX3-5.0 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 alternatives. Pin 3 is NC and must be left unconnected or tied to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode (cathode-side terminal) | Connects to system ground or low-impedance return path; reverse-biased configuration requires current sink into this node. |
| Pin 2 (–) | Cathode (reference output) | Provides stable 5.000V output; connects directly to ADC REF+, op-amp non-inverting input, or microcontroller VREF. |
| Pin 3 (N.C.) | No connection | Must remain floating or shorted to Pin 2; no internal circuitry - violation risks parametric deviation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint enables placement in space-constrained IoT sensor nodes and wearable PCBs. |
| No output capacitor required | Eliminates BOM cost and layout area for stability components while maintaining phase margin >45° with 1µF load. |
| Tolerates capacitive loads | Stable with any output capacitance (0–1µF), simplifying interface to switched-capacitor ADCs and RF power detectors. |
| Extended temperature range | Specified from –40°C to +125°C, supporting under-hood automotive modules and industrial motor drives without derating. |
| Low 80µVRMS noise | Enables direct use in 16-bit precision data acquisition without external low-noise LDO or RC filtering stages. |
Applications
| Portable Power Monitoring | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery voltage measurement in handheld test equipment with 3.3V MCU and 12-bit ADC. IC Role / Device Role / Timing Role: Provides stable 5.000V reference for ADC conversion of Li-ion cell voltage (0–4.2V range). Use Value: Enables ±0.2% full-scale accuracy without software calibration, reducing firmware complexity and field recalibration needs. | Use Scenario: Bridge amplifier excitation in strain-gauge pressure transducers operating at 125°C ambient. IC Role / Device Role / Timing Role: Supplies precise 5.000V excitation to Wheatstone bridge, referenced by instrumentation amplifier. Use Value: Maintains <±1.5mV total error over temperature, meeting IEC 61000-6-2 immunity requirements for industrial process control. |
| High-Accuracy Data Acquisition | Automotive Body Control Module |
Use Scenario: Reference for 16-bit SAR ADC sampling thermocouple signals in medical diagnostic devices. IC Role / Device Role / Timing Role: Delivers low-noise 5.000V reference with <80µVRMS broadband noise to maximize ENOB. Use Value: Achieves 15.2 ENOB at 100ksps, eliminating need for external noise-reduction circuitry and saving board space. | Use Scenario: Voltage reference for window comparator monitoring 12V battery health in BCMs. IC Role / Device Role / Timing Role: Sets precise 5.000V threshold for undervoltage/overvoltage detection logic. Use Value: Guarantees ±10mV trip-point accuracy across –40°C to +125°C, preventing false fault triggers during cold cranking or hot soak. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050B50IDCKR | 0.2% initial accuracy, ±50ppm/°C tempco, SOT23-3, 5.0V output | Higher tempco increases drift by ~2× over –40°C to +125°C; lower max shunt current (10mA vs. 15mA) | Select when cost sensitivity outweighs temperature stability requirements in consumer-grade designs. |
| ADR3450ARJZ-R7 | 0.1% initial accuracy, ±10ppm/°C tempco, SOT23-5, 5.0V output, 3.5µA quiescent current | Series topology requires external pass transistor; not pin-compatible; higher accuracy but larger footprint | Select when ultra-low drift (<±0.5mV) is mandatory and board area permits SOT23-5 layout. |
Compared with TL4050B50IDCKR and ADR3450ARJZ-R7, LM4040BEX3-5.0 delivers superior thermal stability in compact SC70 packaging while maintaining true two-terminal simplicity - ideal for space-constrained, high-reliability industrial and automotive applications where shunt topology and minimal component count are prioritized.
Availability
LM4040BEX3-5.0 is available at Aetrix Electronics and suitable for portable power monitoring, industrial sensor signal conditioning, and high-accuracy data acquisition requiring stable component supply across extended temperature ranges.
Supply support for LM4040BEX3-5.0 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The LM4040 product line delivers micropower, high-accuracy shunt references optimized for space-constrained, wide-temperature applications where traditional three-terminal references lack integration or thermal performance.
FAQ
What is the guaranteed operating temperature range for LM4040BEX3-5.0?
The LM4040BEX3-5.0 is fully specified and guaranteed over –40°C to +125°C. This extended industrial temperature range is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics sections of the official Maxim Integrated datasheet (Rev 8, 3/13), making LM4040BEX3-5.0 suitable for under-hood automotive and high-ambient industrial environments where standard commercial-grade references fail.
Does LM4040BEX3-5.0 require an external output capacitor for stability?
No, LM4040BEX3-5.0 does not require an external output capacitor. The device is internally compensated and remains stable with any capacitive load from 0 to 1µF, as explicitly stated in the General Description and Applications Information sections. This eliminates BOM cost and layout risk associated with capacitor selection, especially critical in high-reliability applications where capacitor aging or ESR variation could degrade reference performance.
What is the minimum shunt current needed for LM4040BEX3-5.0 to maintain regulation?
The minimum operating current for LM4040BEX3-5.0 is 54µA, as specified in the ELECTRICAL CHARACTERISTICS-5.000V table (IRMIN, LM4040A/B/C grade). Below this current, the device may exit regulation and exhibit increased output voltage error. Designers must ensure the source resistor (RS) and supply voltage combination guarantees ≥54µA shunt current across all operating conditions, including worst-case low-VS and high-ILOAD scenarios.
How does the pin configuration of LM4040BEX3-5.0 differ from standard zener diodes?
LM4040BEX3-5.0 uses a 3-pin SC70 package with Pin 1 (+) as anode, Pin 2 (–) as cathode/reference output, and Pin 3 (N.C.) as no-connect - unlike standard two-terminal zeners. Pin 3 must be left unconnected or tied to Pin 2 per the Pin Description section. This configuration isolates the reference node (Pin 2) from package parasitics and enables cleaner routing in high-PSRR analog layouts, distinguishing LM4040BEX3-5.0 from legacy discrete zener implementations.
What is the wideband noise performance of LM4040BEX3-5.0, and how does it impact precision ADC applications?
LM4040BEX3-5.0 delivers 80µVRMS wideband noise over 10Hz–10kHz, measured at 100µA shunt current. This low noise floor supports 16-bit SAR ADCs without external filtering, as confirmed in the ELECTRICAL CHARACTERISTICS-5.000V table and Typical Operating Characteristics plots. In practice, this enables ≥15.2 ENOB at 100ksps, directly improving measurement resolution in medical and test equipment where reference noise dominates system error budget.
LM4040BEX3-5.0 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:
- ±0.2%
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040BEX3-5.0 FAQ
1.How can I place an order for LM4040BEX3-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BEX3-5.0 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 LM4040BEX3-5.0 reliable?
The price and inventory of LM4040BEX3-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BEX3-5.0 is usually 5 days.
3.What payment methods are accepted for LM4040BEX3-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BEX3-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BEX3-5.0?
LM4040BEX3-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BEX3-5.0 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 LM4040BEX3-5.0?
For technical support, including LM4040BEX3-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BEX3-5.0 requirements.
6.How does Aetrix verify that LM4040BEX3-5.0 is sourced from the original manufacturer or authorized distributors?
All LM4040BEX3-5.0 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 LM4040BEX3-5.0 meets industry standards.
7.What is the process for return or replacement of LM4040BEX3-5.0?
All LM4040BEX3-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BEX3-5.0, 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 LM4040BEX3-5.0 part is unused and in its original packaging.
Return procedure for LM4040BEX3-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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