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Analog Devices Inc./Maxim Integrated LM4040BEX3-5.0-T
- Part No.:
- LM4040BEX3-5.0-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040BEX3-5.0-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
LM4040BEX3-5.0-T from Maxim Integrated is a precision 5.000V two-terminal shunt voltage reference in SC70-3 package, featuring 0.2% initial accuracy, ±100ppm/°C temperature coefficient, and guaranteed operation from -40°C to +125°C. It delivers stable reverse-breakdown voltage with 60μA to 15mA shunt current capability and no external capacitor requirement-ideal for space-constrained battery-powered instrumentation.
For engineers reviewing the LM4040BEX3-5.0-T datasheet, LM4040BEX3-5.0-T pinout, LM4040BEX3-5.0-T application, or LM4040BEX3-5.0-T equivalent, key selection criteria include its ultra-small SC70 footprint, tight tolerance over extended temperature range, low dynamic impedance (≤0.8Ω), wideband noise (80µVRMS), and compatibility with capacitive loads without instability.
Technical Context
The LM4040BEX3-5.0-T uses bandgap-based shunt regulation to maintain a precise 5.000V reverse breakdown voltage across its cathode-anode terminals. Its laser-trimmed internal resistor network ensures 0.2% initial accuracy at +25°C, with temperature drift bounded by ±100ppm/°C over -40°C to +125°C.
It operates as a two-terminal device requiring only a series source resistor to set shunt current between 60μA and 15mA. With no minimum output capacitance requirement and inherent stability into any capacitive load, it eliminates external compensation while maintaining <12mV total voltage variation across full operating current and temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V nominal; ±10mV max tolerance at +25°C (B-grade), enabling accurate ADC/DAC reference in 5V systems. |
| Initial Accuracy | ±0.2% at +25°C; ensures ≤10mV absolute error before temperature or aging effects. |
| Temp Coefficient | ±100ppm/°C max; contributes ≤±10mV drift over -40°C to +125°C span. |
| Shunt Current Range | 60μA to 15mA; supports low-power sensor biasing and high-current reference buffering without external active circuitry. |
| Dynamic Impedance | ≤0.8Ω at 1mA; maintains voltage stability against rapid load transients in precision analog front-ends. |
| Wideband Noise | 80µVRMS (10Hz–10kHz); suitable for 12-bit+ data acquisition where reference noise directly limits SNR. |
| Long-Term Stability | 120ppm after 1000h; corresponds to ~0.6mV drift over 6 months of continuous operation. |
Pinout & Package
The LM4040BEX3-5.0-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is unconnected (N.C.) and must remain floating or tied to pin 2 per datasheet instruction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias input terminal; connects to higher-potential supply rail via series resistor. |
| 2 (–) | Anode | Reference ground node; forms stable 5.000V potential relative to cathode when shunt current flows. |
| 3 (N.C.) | No Connection | Internally unconnected; must be left floating or shorted to pin 2-never driven or loaded. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves PCB real estate in portable and wearable designs. |
| No output capacitor required | Eliminates BOM cost and layout complexity while ensuring stability into any capacitive load. |
| Guaranteed -40°C to +125°C operation | Validated performance across automotive under-hood and industrial control environments. |
| Low 80µVRMS wideband noise | Enables high-resolution measurement systems without additional filtering or low-noise op-amps. |
| 60μA minimum operating current | Supports micropower applications such as coin-cell–powered sensors and IoT edge nodes. |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring stable 5V reference for analog signal conditioning. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precise 5.000V bias for ADC input scaling and sensor excitation. Use Value: 0.2% initial accuracy and ±100ppm/°C TC ensure <±12mV total error across clinical temperature range (0°C–45°C), meeting ISO 13485 calibration requirements. | Use Scenario: Modular PLC analog input modules measuring 4–20mA loop signals in factory automation. IC Role / Device Role / Timing Role: Primary voltage reference for 16-bit SAR ADCs converting conditioned current-loop outputs. Use Value: Low 0.8Ω dynamic impedance minimizes reference droop during multiplexed channel switching, preserving measurement repeatability across 8-channel scans. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Reference for microcontroller ADCs monitoring battery voltage, cabin temperature, and lighting feedback in BCMs. IC Role / Device Role / Timing Role: High-temperature-stable shunt reference supplying 5.000V to MCU internal ADC and external comparators. Use Value: Guaranteed operation to +125°C ambient and 120ppm long-term stability enable 15-year field reliability without recalibration. | Use Scenario: Revenue-grade electricity meter reference supporting IEC 62053-21 Class 0.2 accuracy compliance. IC Role / Device Role / Timing Role: Precision 5V reference for metrology ADCs digitizing isolated current/voltage transformers. Use Value: 80µVRMS noise floor and <12mV total voltage variation over 10-year lifetime meet EN 50470-3 AC power measurement uncertainty budgets. |
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 2.5V–36V output; 0.5% initial accuracy; 100ppm/°C TC; SOT23-3 package. | Requires two external resistors to set 5.0V; higher minimum cathode current (80μA); not pretrimmed. | Select when adjustable output or higher voltage capability is needed; verify layout accommodates resistor placement. |
| ADR3450ARJZ-R7 | Fixed 5.0V; 0.1% initial accuracy; 30ppm/°C TC; SC70-5 package with enable pin. | Three-terminal series reference; requires separate supply and ground pins; higher quiescent current (120μA). | Select when lower tempco or tighter initial accuracy justifies larger footprint and added pin count. |
Compared with TLVH431ACDBVR and ADR3450ARJZ-R7, the LM4040BEX3-5.0-T offers the smallest PCB area, lowest system component count (no external resistors), and optimal balance of accuracy, thermal stability, and micropower operation for fixed 5V shunt reference use cases.
Availability
LM4040BEX3-5.0-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 multi-year production cycles.
Supply support for LM4040BEX3-5.0-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 is a semiconductor company specializing in analog and mixed-signal ICs for industrial, automotive, communications, and consumer applications.
The LM4040 product line delivers precision, micropower shunt voltage references optimized for space-constrained, battery-operated, and high-reliability systems demanding stable reference voltages across wide temperature ranges.
FAQ
What is the maximum shunt current rating for the LM4040BEX3-5.0-T?
The LM4040BEX3-5.0-T supports a continuous shunt current up to 15mA. Absolute maximum reverse current is 20mA, but operation beyond 15mA risks exceeding the 174mW power dissipation limit of the SC70-3 package at elevated ambient temperatures. For reliable long-term operation, design the source resistor to keep ISHUNT ≤15mA across all voltage and load conditions.
Can the LM4040BEX3-5.0-T be used with large output capacitors?
Yes-the LM4040BEX3-5.0-T is inherently stable into any capacitive load and does not require an external output capacitor. Unlike many shunt references, it contains internal compensation that prevents oscillation even with >10µF ceramic or tantalum capacitors placed directly at its cathode-anode terminals, simplifying layout in noise-sensitive applications.
What is the meaning of "B" and "E" in the LM4040BEX3-5.0-T part number?
In LM4040BEX3-5.0-T, "B" denotes the 0.2% initial accuracy grade, and "E" indicates the extended temperature range (-40°C to +125°C). The "X3" suffix specifies the SC70-3 package, and "T" indicates tape-and-reel packaging. This exact combination ensures guaranteed 5.000V output with ±10mV tolerance over the full industrial temperature range.
How does the LM4040BEX3-5.0-T compare to the LM4040AIM3-5.0+T?
The LM4040BEX3-5.0-T and LM4040AIM3-5.0+T both provide 5.000V reference, but differ in accuracy grade (0.2% vs. 0.1%), temperature range (-40°C to +125°C vs. -40°C to +85°C), and package (SC70-3 vs. SOT23-3). The LM4040BEX3-5.0-T trades 0.1% tighter initial accuracy for wider temperature coverage and 50% smaller footprint-critical for high-density, high-temp applications.
Is pin 3 of the LM4040BEX3-5.0-T required to be connected?
No-pin 3 of the LM4040BEX3-5.0-T is designated N.C. (No Connection) and must remain unconnected or be tied to pin 2 (anode) per the datasheet. Connecting pin 3 to any other net, including ground or supply, violates the specified pin configuration and may cause parametric deviation or functional failure.
LM4040BEX3-5.0-T 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-T FAQ
1.How can I place an order for LM4040BEX3-5.0-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BEX3-5.0-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 LM4040BEX3-5.0-T reliable?
The price and inventory of LM4040BEX3-5.0-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BEX3-5.0-T is usually 5 days.
3.What payment methods are accepted for LM4040BEX3-5.0-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BEX3-5.0-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BEX3-5.0-T?
LM4040BEX3-5.0-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BEX3-5.0-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 LM4040BEX3-5.0-T?
For technical support, including LM4040BEX3-5.0-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BEX3-5.0-T requirements.
6.How does Aetrix verify that LM4040BEX3-5.0-T is sourced from the original manufacturer or authorized distributors?
All LM4040BEX3-5.0-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 LM4040BEX3-5.0-T meets industry standards.
7.What is the process for return or replacement of LM4040BEX3-5.0-T?
All LM4040BEX3-5.0-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BEX3-5.0-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 LM4040BEX3-5.0-T part is unused and in its original packaging.
Return procedure for LM4040BEX3-5.0-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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