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Analog Devices Inc./Maxim Integrated LM4040AEX3-4.1+T
- Part No.:
- LM4040AEX3-4.1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040AEX3-4.1+T.pdf
- Description:
- IC VREF SHUNT 0.1% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
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Product details
Overview
LM4040AEX3-4.1+T from Maxim Integrated is a precision 4.096V two-terminal shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±100ppm/°C temperature coefficient, and guaranteed operation from –40°C to +125°C. It delivers stable reverse breakdown voltage with 60μA–15mA shunt current capability and low 64μVRMS wideband noise (10Hz–10kHz), ideal for high-accuracy ADC/DAC biasing in automotive sensor modules.
For engineers reviewing the LM4040AEX3-4.1+T datasheet, LM4040AEX3-4.1+T pinout, LM4040AEX3-4.1+T application, or LM4040AEX3-4.1+T equivalent, key selection criteria include its A-grade accuracy, extended temperature range, SC70 footprint compatibility, and absence of required output capacitance in space-constrained designs.
Technical Context
The LM4040AEX3-4.1+T uses bandgap-based shunt regulation to maintain a precise 4.096V reverse breakdown voltage across its cathode-anode terminals. Its internal laser-trimmed resistor network ensures 0.1% initial tolerance, while thermal design guarantees ±100ppm/°C drift over –40°C to +125°C.
It operates as a two-terminal device requiring only an external series resistor to set shunt current between 60μA and 15mA. No output capacitor is needed for stability, and it tolerates arbitrary capacitive loads - enabling direct integration into analog front-ends without compensation circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal; tight tolerance enables direct use with 12-bit ADCs without calibration. |
| Initial Accuracy | ±0.1% at +25°C; supports high-precision measurement systems requiring <1mV absolute error. |
| Temp Coefficient | ±100ppm/°C max; ensures ≤±0.52mV drift over full –40°C to +125°C range. |
| Shunt Current Range | 60μA to 15mA; accommodates ultra-low-power sensors and higher-current analog circuits. |
| Wideband Noise | 64μVRMS (10Hz–10kHz); low enough for 16-bit SAR ADC reference without filtering. |
| Dynamic Impedance | 0.5Ω to 1.0Ω at 1mA; maintains voltage stability under load transients up to 10mA step changes. |
| Long-Term Stability | 120ppm after 1000h; ensures minimal drift in mission-critical automotive or industrial deployments. |
Pinout & Package
LM4040AEX3-4.1+T is housed in a RoHS-compliant 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-biased terminal; connects to regulated voltage node and current-setting resistor. |
| 2 (–) | Anode | Reference ground return; forms the low-side connection for shunt current path. |
| 3 (N.C.) | No Connection | Internally unconnected; must be left floating or shorted to pin 2 per datasheet directive. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% board space vs. SOT23, critical for portable and automotive ECUs. |
| A-grade 0.1% accuracy | Enables single-point calibration elimination in 12-bit data acquisition systems. |
| Extended temperature range | –40°C to +125°C operation supports under-hood automotive and industrial control applications. |
| No output capacitor required | Reduces BOM count and layout complexity; eliminates capacitor aging and ESR-related drift. |
| Capacitive load tolerance | Stable with any output capacitance, simplifying integration into noisy mixed-signal environments. |
Applications
| Automotive Sensor Biasing | Portable Medical Instrumentation |
|---|---|
Use Scenario: Providing stable excitation voltage for bridge-based pressure and temperature sensors in engine control units. IC Role / Device Role / Timing Role: Two-terminal shunt reference establishing precise 4.096V bias point for ratiometric sensor signal conditioning. Use Value: Enables <±0.5 LSB error in 12-bit ADC conversions across full automotive temperature range without recalibration. | Use Scenario: Supplying reference voltage for portable blood glucose meters and pulse oximeters with battery life constraints. IC Role / Device Role / Timing Role: Micropower shunt reference operating at 60μA minimum current to extend coin-cell battery life beyond 2 years. Use Value: Delivers 0.1% accuracy at ultra-low current, eliminating need for power-gating circuitry during standby. |
| Industrial Data Acquisition | Smart Energy Metering |
Use Scenario: Serving as reference for isolated 16-bit sigma-delta ADCs in programmable logic controllers and RTUs. IC Role / Device Role / Timing Role: Low-noise (64μVRMS) voltage reference minimizing quantization uncertainty in high-resolution measurements. Use Value: Maintains effective resolution >15.5 bits over temperature, meeting IEC 61000-4-30 Class A requirements. | Use Scenario: Reference source for metrology-grade ADCs in DIN-rail energy meters deployed in utility substations. IC Role / Device Role / Timing Role: AEC-Q100 qualified shunt reference ensuring long-term stability (120ppm/1000h) in harsh electromagnetic environments. Use Value: Eliminates annual recalibration cycles by maintaining <0.012% total error over 10-year field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | Adjustable 1.24V–18V output; 1% initial accuracy; 3-pin SOT23; no SC70 option. | Requires external resistors for 4.096V setting; higher tempco (150ppm/°C); not AEC-Q100 qualified. | Select when adjustable output or cost sensitivity outweighs accuracy and automotive qualification needs. |
| MAX6008AEUR+T | Fixed 4.096V; 0.1% accuracy; SC70-3; but limited to –40°C to +85°C operation. | Lacks extended temperature support; unsuitable for under-hood or industrial high-temp environments. | Choose only for commercial-grade applications where ambient stays below +85°C. |
Compared with TLV431ACDBVR and MAX6008AEUR+T, LM4040AEX3-4.1+T uniquely combines A-grade 0.1% accuracy, –40°C to +125°C operation, SC70 size, and zero-output-capacitor stability - making it the sole option for automotive-qualified, space-constrained, high-precision shunt references.
Availability
LM4040AEX3-4.1+T is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical devices, industrial data loggers, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM4040AEX3-4.1+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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, high-reliability systems where stability, low noise, and extended temperature performance are critical.
FAQ
What is the exact output voltage tolerance of LM4040AEX3-4.1+T at +25°C?
The LM4040AEX3-4.1+T has a nominal reverse breakdown voltage of 4.096V with ±0.1% initial accuracy at +25°C, corresponding to a guaranteed range of 4.092V to 4.100V. This A-grade tolerance is laser-trimmed and specified in the Electrical Characteristics table for the 4.096V variant under TA = +25°C conditions.
Does LM4040AEX3-4.1+T require an external output capacitor for stability?
No, LM4040AEX3-4.1+T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including zero capacitance. This eliminates BOM components and layout dependencies, simplifying design for noise-sensitive applications like precision ADC references.
What is the minimum operating current for LM4040AEX3-4.1+T across its full temperature range?
The LM4040AEX3-4.1+T requires a minimum shunt current of 73μA over its full –40°C to +125°C operating range, as specified in the Electrical Characteristics table for the 4.096V variant. Below this current, regulation is not guaranteed, and output voltage may deviate beyond tolerance limits.
Is LM4040AEX3-4.1+T qualified for automotive applications?
Yes, LM4040AEX3-4.1+T is AEC-Q100 qualified for automotive applications. Its E-grade temperature rating (–40°C to +125°C), robust construction, and long-term stability (120ppm/1000h) meet requirements for under-hood and body-control module deployments, as confirmed in the Benefits and Features section of the datasheet.
How does the SC70-3 package of LM4040AEX3-4.1+T compare in size to the SOT23-3 option?
The SC70-3 package of LM4040AEX3-4.1+T measures 1.8mm × 1.8mm, which is 50% smaller than the standard SOT23-3 footprint. This reduction enables denser PCB layouts in space-constrained applications such as wearable health monitors and compact automotive ECUs, without sacrificing electrical performance or thermal derating capability.
LM4040AEX3-4.1+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- 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
LM4040AEX3-4.1+T FAQ
1.How can I place an order for LM4040AEX3-4.1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEX3-4.1+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 LM4040AEX3-4.1+T reliable?
The price and inventory of LM4040AEX3-4.1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AEX3-4.1+T is usually 5 days.
3.What payment methods are accepted for LM4040AEX3-4.1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEX3-4.1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEX3-4.1+T?
LM4040AEX3-4.1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEX3-4.1+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 LM4040AEX3-4.1+T?
For technical support, including LM4040AEX3-4.1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEX3-4.1+T requirements.
6.How does Aetrix verify that LM4040AEX3-4.1+T is sourced from the original manufacturer or authorized distributors?
All LM4040AEX3-4.1+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 LM4040AEX3-4.1+T meets industry standards.
7.What is the process for return or replacement of LM4040AEX3-4.1+T?
All LM4040AEX3-4.1+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEX3-4.1+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 LM4040AEX3-4.1+T part is unused and in its original packaging.
Return procedure for LM4040AEX3-4.1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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