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Analog Devices Inc./Maxim Integrated LM4040BEX3-4.1+
- Part No.:
- LM4040BEX3-4.1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040BEX3-4.1+.pdf
- Description:
- LM4040 IMPROVED PRECISION MICROP
- Quantity:
- Payment:
- Shipping:
Inventory:2,687
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Product details
Overview
LM4040BEX3-4.1+ from Maxim Integrated is a precision 4.096V two-terminal shunt voltage reference in SC70-3 package, featuring 0.2% initial accuracy, ±15ppm/°C temperature coefficient over –40°C to +125°C, 50µA to 15mA operating current range, and 64µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference for ADC/DAC biasing, sensor excitation, and portable power monitoring circuits.
For engineers reviewing the LM4040BEX3-4.1+ datasheet, LM4040BEX3-4.1+ pinout, LM4040BEX3-4.1+ application, or LM4040BEX3-4.1+ equivalent, key selection considerations include its guaranteed extended-temperature operation, no-output-capacitor requirement, low dynamic impedance (0.5–1.3Ω), and compatibility with capacitive loads in space-constrained industrial and battery-powered systems.
Technical Context
The LM4040BEX3-4.1+ implements a bandgap-based shunt reference architecture, functioning as a precision two-terminal device that maintains a stable 4.096V reverse breakdown voltage across its anode and cathode when biased with 50µA–15mA shunt current. Its laser-trimmed internal resistor network ensures tight initial tolerance without external calibration.
It operates without requiring an output capacitor and remains stable under any capacitive load condition. The device's thermal design supports full specification compliance across –40°C to +125°C, with guaranteed long-term stability of 120ppm after 1000 hours and low 64µVRMS noise performance critical for high-resolution data acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal; tightly specified min/max (4.088V–4.104V at +25°C) enables accurate 12-bit DAC/ADC reference scaling. |
| Initial Accuracy | ±0.2% (B-grade); corresponds to ±8.2mV absolute error at 4.096V, suitable for sub-10mV system-level voltage calibration. |
| Tempco | ±15ppm/°C max; contributes ≤±0.62mV drift over –40°C to +125°C, supporting stable performance in automotive and industrial environments. |
| Operating Current | 50µA to 15mA; ultra-low 50µA minimum enables micropower sensor nodes; 15mA upper limit supports robust regulation under heavy load transients. |
| Noise (10Hz–10kHz) | 64µVRMS; low noise floor preserves signal integrity in precision analog front-ends and high-SNR measurement systems. |
| Dynamic Impedance | 0.5–1.3Ω (1mA, 120Hz); ensures minimal voltage shift (<13mV) across full 1–15mA load current range, critical for load-regulation-sensitive references. |
| Long-Term Stability | 120ppm after 1000h; translates to <0.5mV drift over 1k hours, enabling reliable operation in unattended instrumentation. |
Pinout & Package
LM4040BEX3-4.1+ is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than comparable SOT23 devices. Pin 3 is NC (no connection) and must be left floating or tied to pin 2 per datasheet directive.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode (positive terminal) | Connected to system ground or low-impedance return path; defines reference potential reference point. |
| Pin 2 (−) | Cathode (negative terminal) | Connected to regulated voltage node; sinks shunt current to maintain precise 4.096V drop across terminals. |
| Pin 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; not internally bonded-floating connection avoids parasitic coupling or ESD risk. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint enables placement in dense PCB layouts for wearables and miniaturized IoT sensors. |
| No output capacitor required | Eliminates BOM cost and board area for external stabilization, simplifying layout and improving reliability in space-constrained designs. |
| Capacitive load tolerance | Stable with any output capacitance value, allowing direct integration with ADC input filters or local decoupling without phase-margin concerns. |
| Extended temperature range | Specified from –40°C to +125°C, supporting deployment in under-hood automotive modules and industrial motor drives. |
| Low 64µVRMS noise | Enables use in 16-bit+ data acquisition systems where reference noise directly limits effective resolution. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered wearable ECG sensor with 16-bit SAR ADC requiring stable excitation and reference. IC Role / Device Role / Timing Role: Provides 4.096V precision reference for ADC and bias voltage for op-amp signal conditioning stage. Use Value: 0.2% initial accuracy and ±15ppm/°C tempco ensure <±1 LSB error across operating temperature, meeting IEC 60601-2-47 clinical accuracy requirements. | Use Scenario: Ruggedized environmental monitor deployed in factory settings with wide ambient temperature swings. IC Role / Device Role / Timing Role: Supplies stable reference for multi-channel 24-bit sigma-delta ADC measuring thermocouple and RTD inputs. Use Value: Extended –40°C to +125°C operation and 120ppm long-term stability eliminate recalibration needs over 5-year field deployment. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: DIN-rail mounted electricity meter with metrology-grade voltage and current sensing. IC Role / Device Role / Timing Role: Delivers 4.096V reference for isolation amplifier feedback and energy measurement IC biasing. Use Value: Low 64µVRMS noise prevents degradation of 0.1% kWh accuracy class; SC70 size reduces PCB real estate in multi-layer meter designs. | Use Scenario: Under-dash BCM managing lighting, window lift, and seat position sensing. IC Role / Device Role / Timing Role: Generates stable 4.096V rail for microcontroller ADC and analog sensor interface circuitry. Use Value: Guaranteed operation up to +125°C ambient and no-output-capacitor design simplify thermal management and reduce component count in confined enclosures. |
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 1.24V–18V output; 0.5% initial accuracy; SOT23-3; requires external resistors for 4.096V setting. | Used where programmability or higher voltage capability is needed; less accurate and noisier (120µVRMS). | Select TLVH431ACDBVR only if adjustable output or >5V capability is required; verify resistor tolerance impact on final accuracy. |
| ADR3440ARJZ-R7 | Fixed 4.096V; 0.1% initial accuracy; SOT23-5; series topology; requires input supply ≥4.3V. | Suitable for low-noise, high-PSRR applications; incompatible with shunt-based topologies or low-headroom supplies. | Choose ADR3440ARJZ-R7 when PSRR >70dB and supply headroom >200mV exist; avoid in battery-powered shunt regulator configurations. |
Compared with TLVH431ACDBVR and ADR3440ARJZ-R7, the LM4040BEX3-4.1+ offers superior micropower operation (50µA min), inherent shunt topology compatibility with high-side sensing, and guaranteed stability without external components-making it optimal for compact, low-voltage, fixed-reference designs.
Availability
LM4040BEX3-4.1+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, smart energy meters, and automotive body control modules requiring stable component supply with full RoHS compliance and traceable sourcing.
Supply support for LM4040BEX3-4.1+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and consumer markets.
The LM4040 product line delivers precision shunt voltage references optimized for space-constrained, micropower, and extended-temperature applications-designed to replace traditional zener diodes with tighter accuracy, lower noise, and guaranteed stability.
FAQ
What is the guaranteed operating temperature range for LM4040BEX3-4.1+?
The LM4040BEX3-4.1+ is fully specified and guaranteed over –40°C to +125°C. This extended temperature range is confirmed in the Ordering Information table (page 13) and Absolute Maximum Ratings section, making it suitable for under-hood automotive and industrial control applications where ambient temperatures exceed +85°C.
Does LM4040BEX3-4.1+ require an external output capacitor for stability?
No, the LM4040BEX3-4.1+ does not require an external output capacitor. As stated in the General Description and Applications Information sections, it is inherently stable with any capacitive load-including zero capacitance-due to its internal bandgap architecture and low dynamic impedance. This eliminates BOM cost and layout complexity.
What is the minimum shunt current required for LM4040BEX3-4.1+ to maintain regulation?
The LM4040BEX3-4.1+ requires a minimum shunt current of 50µA to maintain regulation, as specified in the Electrical Characteristics table for 4.096V grade (page 6). This ultra-low current enables operation in micropower systems such as coin-cell–powered sensors and always-on wake-up circuits.
How does the noise performance of LM4040BEX3-4.1+ compare to other shunt references?
The LM4040BEX3-4.1+ delivers 64µVRMS wideband noise (10Hz–10kHz), measured at 100µA operating current. This is lower than typical alternatives like TLVH431 (120µVRMS) and competitive with higher-cost series references-enabling use in 16-bit+ data acquisition systems without additional filtering.
Can Pin 3 of LM4040BEX3-4.1+ be left floating or must it be connected?
Per the Pin Description section (page 12), Pin 3 of LM4040BEX3-4.1+ is N.C. (no connection) and must be left unconnected or tied to Pin 2 (cathode). It is not internally bonded; leaving it floating poses no functional risk, but connecting it to Pin 2 provides ESD protection margin and is explicitly permitted in the datasheet.
LM4040BEX3-4.1+ 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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 64µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 73 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040BEX3-4.1+ FAQ
1.How can I place an order for LM4040BEX3-4.1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BEX3-4.1+ 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 LM4040BEX3-4.1+ reliable?
The price and inventory of LM4040BEX3-4.1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BEX3-4.1+ is usually 5 days.
3.What payment methods are accepted for LM4040BEX3-4.1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BEX3-4.1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BEX3-4.1+?
LM4040BEX3-4.1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BEX3-4.1+ 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 LM4040BEX3-4.1+?
For technical support, including LM4040BEX3-4.1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BEX3-4.1+ requirements.
6.How does Aetrix verify that LM4040BEX3-4.1+ is sourced from the original manufacturer or authorized distributors?
All LM4040BEX3-4.1+ 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 LM4040BEX3-4.1+ meets industry standards.
7.What is the process for return or replacement of LM4040BEX3-4.1+?
All LM4040BEX3-4.1+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BEX3-4.1+, 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 LM4040BEX3-4.1+ part is unused and in its original packaging.
Return procedure for LM4040BEX3-4.1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040BEX3-4.1+ Tags
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