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Analog Devices Inc./Maxim Integrated LM4040DEX3-5.0-T
- Part No.:
- LM4040DEX3-5.0-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DEX3-5.0-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
LM4040DEX3-5.0-T from Maxim Integrated is a precision 5.000V, two-terminal shunt voltage reference in SC70-3 package with ±1.0% initial accuracy, ±150ppm/°C temperature coefficient, 60μA–15mA operating current range, and guaranteed operation from –40°C to +125°C. It delivers stable reverse-breakdown voltage for ADC/DAC biasing, portable power monitoring, and industrial sensor excitation.
For engineers reviewing the LM4040DEX3-5.0-T datasheet, LM4040DEX3-5.0-T pinout, LM4040DEX3-5.0-T application, or LM4040DEX3-5.0-T equivalent, key selection criteria include shunt current capability, temperature drift over full industrial range, SC70 footprint constraints, and no-output-capacitor stability in battery-powered systems.
Technical Context
The LM4040DEX3-5.0-T uses bandgap-based shunt regulation to maintain a precise 5.000V reverse breakdown voltage across its anode and cathode terminals. Its internal laser-trimmed resistor network ensures ±1.0% initial accuracy at +25°C, while the 150ppm/°C max temperature coefficient defines worst-case drift 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. No external capacitor is needed for stability-even with capacitive loads-due to low dynamic impedance (≤1.5Ω at 1mA) and inherent frequency compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V nominal; ±50mV tolerance at +25°C (±1.0% grade) |
| Initial Accuracy | ±1.0% at +25°C; translates to ±50mV absolute error before temperature effects |
| Temp Coefficient | ±150ppm/°C max; adds ≤±15mV drift over full –40°C to +125°C range |
| Operating Current | 60μA to 15mA; enables micropower sleep modes and high-current regulation |
| Dynamic Impedance | ≤1.5Ω at 1mA; ensures <15mV output shift under 1mA load transients |
| Wideband Noise | 80µVRMS (10Hz–10kHz); suitable for 12-bit ADC reference without filtering |
| Long-Term Stability | 120ppm after 1000h; ~0.012% drift over 6 months of continuous operation |
Pinout & Package
LM4040DEX3-5.0-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is unconnected (N.C.) and must be left floating or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to system ground or low-side reference node; current flows into this pin during regulation |
| 2 (–) | Cathode (negative terminal) | Connects to regulated voltage rail; reverse breakdown occurs between pins 2 and 1 |
| 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% PCB space vs. SOT23; ideal for wearables and compact modules |
| No output capacitor required | Stable with any capacitive load up to 10µF; eliminates BOM cost and layout risk of external C |
| Extended temperature range | –40°C to +125°C operation supports automotive under-hood and industrial control environments |
| Low quiescent current capability | Regulates down to 60μA; enables battery life extension in always-on sensor nodes |
| High shunt current headroom | Handles up to 15mA; supports driving multiple downstream references or op-amp bias networks |
Applications
| Portable Power Monitoring | Industrial Sensor Excitation |
|---|---|
Use Scenario: Measuring Li-ion battery voltage in handheld medical devices with 12-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 5.000V reference for ADC VREF input, rejecting supply ripple and temperature drift. Use Value: Enables ±0.5% end-to-end voltage measurement accuracy over –20°C to +60°C ambient without calibration. | Use Scenario: Supplying excitation voltage to 350Ω strain gauges in factory-floor load cells. IC Role / Device Role / Timing Role: Delivers low-noise, temperature-stable 5.000V to bridge circuit, minimizing zero-drift errors. Use Value: Reduces thermal offset error to <0.05% FS over –40°C to +85°C, meeting Class C sensor specs. |
| ADC/DAC Bias Reference | Microcontroller Analog Peripherals |
Use Scenario: Setting reference for 16-bit delta-sigma ADC in programmable logic controller (PLC) analog input module. IC Role / Device Role / Timing Role: Supplies precision 5.000V to ADC's external reference pin, replacing internal bandgap for higher linearity. Use Value: Improves effective resolution from 14.2 to 15.1 ENOB by reducing reference noise and drift contribution. | Use Scenario: Providing VREF+ for STM32H7 ADC and DAC peripherals in motor control firmware validation board. IC Role / Device Role / Timing Role: Acts as shared reference source for both conversion blocks, ensuring consistent gain matching. Use Value: Eliminates differential nonlinearity errors caused by separate internal references, enabling closed-loop current sensing at <1% THD. |
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) vs. fixed 5.000V; 0.5% initial accuracy; 90ppm/°C tempco; SOT23-3 | Requires two external resistors for 5V setting; less accurate but lower tempco and wider voltage range | Select when design requires flexibility to reconfigure reference voltage or needs tighter drift control below 100ppm/°C |
| ADR3450ARJZ-R7 | 5.000V fixed; 0.1% initial accuracy; 10ppm/°C tempco; SC70-5; 3.3V–5.5V supply-dependent | Series reference (3-pin) requiring supply voltage; superior accuracy/stability but larger footprint and higher cost | Select when ultra-high precision (<0.05% total error) and lowest noise (4.8µVRMS) justify added complexity and cost |
Compared with TLVH431ACDBVR and ADR3450ARJZ-R7, the LM4040DEX3-5.0-T offers the smallest footprint and simplest two-terminal interface for fixed 5V reference, trading off absolute accuracy and tempco for space-constrained, cost-sensitive industrial and portable designs where ±1% total error is acceptable.
Availability
LM4040DEX3-5.0-T is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, and PLC analog I/O modules requiring stable component supply with extended temperature support and minimal PCB area.
Supply support for LM4040DEX3-5.0-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 power, sensing, and communication applications.
The LM4040 product line delivers precision shunt voltage references optimized for space-constrained, battery-powered, and high-reliability industrial systems requiring stable reference voltages without external components.
FAQ
What is the minimum operating current for LM4040DEX3-5.0-T?
The LM4040DEX3-5.0-T requires a minimum shunt current of 60μA to maintain regulation. This value is specified across the full –40°C to +125°C temperature range and ensures stable 5.000V output even in ultra-low-power sleep states. Below 60μA, the device exits regulation and output voltage drops nonlinearly.
Can LM4040DEX3-5.0-T be used with capacitive loads?
Yes, the LM4040DEX3-5.0-T is inherently stable with any capacitive load, including ceramic, tantalum, or electrolytic capacitors up to at least 10µF. Unlike many shunt references, it does not require an external series resistor or damping network because its low dynamic impedance (≤1.5Ω) and internal compensation prevent oscillation.
What is the maximum junction temperature of LM4040DEX3-5.0-T?
The absolute maximum junction temperature for LM4040DEX3-5.0-T is +150°C. With its SC70-3 package derating factor of 2.17mW/°C above +70°C and 174mW maximum power dissipation at +70°C, sustained operation at +125°C ambient requires limiting shunt current to avoid exceeding this limit-e.g., ≤10mA at 5V yields 50mW, keeping junction temperature within safe margin.
How does the temperature coefficient affect LM4040DEX3-5.0-T performance over –40°C to +125°C?
The LM4040DEX3-5.0-T has a maximum temperature coefficient of ±150ppm/°C. Over the full –40°C to +125°C range (ΔT = 165°C), this contributes up to ±24.75mV (±0.495%) additional error beyond the ±50mV initial tolerance, resulting in a worst-case total output variation of ±74.75mV (±1.495%) relative to 5.000V.
Is pin 3 of LM4040DEX3-5.0-T functional or optional?
Pin 3 of LM4040DEX3-5.0-T is designated N.C. (no connection) and is not internally bonded. It must be left unconnected or tied directly to pin 2 (cathode). Connecting pin 3 to any other net-including ground or supply-violates the datasheet requirement and may cause unpredictable regulation behavior or damage.
LM4040DEX3-5.0-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:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 85 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040DEX3-5.0-T FAQ
1.How can I place an order for LM4040DEX3-5.0-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEX3-5.0-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 LM4040DEX3-5.0-T reliable?
The price and inventory of LM4040DEX3-5.0-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEX3-5.0-T is usually 5 days.
3.What payment methods are accepted for LM4040DEX3-5.0-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEX3-5.0-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEX3-5.0-T?
LM4040DEX3-5.0-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEX3-5.0-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 LM4040DEX3-5.0-T?
For technical support, including LM4040DEX3-5.0-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEX3-5.0-T requirements.
6.How does Aetrix verify that LM4040DEX3-5.0-T is sourced from the original manufacturer or authorized distributors?
All LM4040DEX3-5.0-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 LM4040DEX3-5.0-T meets industry standards.
7.What is the process for return or replacement of LM4040DEX3-5.0-T?
All LM4040DEX3-5.0-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEX3-5.0-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 LM4040DEX3-5.0-T part is unused and in its original packaging.
Return procedure for LM4040DEX3-5.0-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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