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Analog Devices Inc./Maxim Integrated LM4040AEX3-4.1
- Part No.:
- LM4040AEX3-4.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040AEX3-4.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:292
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Product details
Overview
LM4040AEX3-4.1 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 no external capacitor requirement-ideal for high-accuracy ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4040AEX3-4.1 datasheet, LM4040AEX3-4.1 pinout, LM4040AEX3-4.1 application, or LM4040AEX3-4.1 equivalent, key selection criteria include its A-grade accuracy, extended temperature range, ultra-small SC70 footprint, low 64µVRMS wideband noise (10Hz–10kHz), and compatibility with capacitive loads without stability compensation.
Technical Context
The LM4040AEX3-4.1 uses bandgap-based shunt regulation to maintain a precise 4.096V reverse breakdown voltage across its terminals when biased with 60μA–15mA cathode-to-anode current. Its internal laser-trimmed resistor network ensures 0.1% initial tolerance at +25°C, while the ±100ppm/°C tempco guarantees tight drift over –40°C to +125°C.
Unlike series references, it operates as a two-terminal device requiring only an external series resistor to set shunt current. It exhibits low 0.5–1.0Ω dynamic impedance at 1mA and tolerates any output capacitance-enabling direct integration into space-constrained analog front-ends without stability concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V nominal; ±4.1mV (±0.1%) tolerance at +25°C ensures accurate 12-bit ADC full-scale reference |
| Initial Accuracy | 0.1% max; enables single-point calibration elimination in precision data acquisition systems |
| Tempco | ±100ppm/°C max; contributes ≤±10.2mV error over –40°C to +125°C ambient range |
| Shunt Current Range | 60μA to 15mA; supports ultra-low-power sensor nodes and high-current reference buffering |
| Wideband Noise | 64µVRMS (10Hz–10kHz); limits quantization uncertainty in 16-bit+ SAR ADC applications |
| Dynamic Impedance | 0.5–1.0Ω at 1mA; maintains <1mV output shift under 1mA load transients |
| Operating Temp Range | –40°C to +125°C; qualified for industrial control and automotive under-hood environments |
Pinout & Package
The LM4040AEX3-4.1 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 alternatives. Pin 3 is no-connect and must remain unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to system ground or low-impedance return path; forms cathode-to-anode bias loop |
| 2 (–) | Cathode (negative terminal) | Output node delivering regulated 4.096V; connects to reference input of ADC/DAC or feedback node |
| 3 (N.C.) | No connection | Must be left floating or shorted to pin 2; no internal functionality-mechanical pad only |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint saves >50% board area vs. SOT23-critical for wearable and IoT edge sensors |
| No output capacitor required | Internally compensated for all capacitive loads; eliminates BOM cost and layout risk from external COUT |
| Stable over full shunt current range | Output voltage change ≤1.2mV from 60μA to 15mA ensures consistent reference across sleep/wake cycles |
| Low 64µVRMS noise | Enables ≥16-bit effective resolution in precision measurement systems without external filtering |
| AEC-Q100 compatible variant available | LM4040BIM3-2.5/V+T and others are AEC-Q100 qualified-LM4040AEX3-4.1 shares same process and reliability |
Applications
| Portable Instrumentation | Industrial Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC and battery-powered operation. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.096V full-scale reference for ADC conversion. Use Value: 0.1% initial accuracy and ±100ppm/°C tempco ensure <0.02% total error over operating temperature-meeting Class I meter specs. | Use Scenario: DIN-rail mounted PLC analog input module measuring 4–20mA sensor signals. IC Role / Device Role / Timing Role: Precision reference for 24-bit delta-sigma ADC driving isolated current-loop interface. Use Value: Guaranteed –40°C to +125°C operation and 64µVRMS noise enable high-resolution measurements in harsh factory environments. |
| Medical Sensor Nodes | Automotive Body Control |
Use Scenario: Wearable ECG patch with ultra-low-power microcontroller and analog front-end. IC Role / Device Role / Timing Role: Low-current shunt reference supplying bias to instrumentation amplifier and ADC reference pin. Use Value: 60μA minimum operating current allows continuous reference operation during deep-sleep MCU states without wake-up latency. | Use Scenario: In-cabin ambient light and humidity sensor module with CAN bus reporting. IC Role / Device Role / Timing Role: Stable reference for signal conditioning circuitry feeding microcontroller ADC inputs. Use Value: SC70-3 size fits tight PCB real estate; extended temperature rating supports operation near HVAC ducts and lighting assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050A41IDBZR | 4.096V, 0.1%, ±50ppm/°C, SOT23-3, 60μA–15mA, 40µVRMS noise | Lower tempco and noise; larger SOT23 footprint; not rated beyond +105°C | Select for lower drift/noise where board space permits and temperature range ≤+105°C suffices |
| REF3040AIDBZR | 4.096V, 0.2%, ±50ppm/°C, SOT23-3, 25μA–25mA, 28µVRMS noise, series topology | Series architecture requires different biasing; higher quiescent current; superior noise performance | Select when ultra-low noise (<30µVRMS) is critical and series reference topology aligns with power architecture |
Compared with TL4050A41IDBZR and REF3040AIDBZR, the LM4040AEX3-4.1 offers the smallest footprint and widest temperature range but trades off slightly higher noise and tempco-making it optimal for space-constrained industrial and portable designs demanding robustness over extreme ambient conditions.
Availability
LM4040AEX3-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, medical sensor nodes, and automotive body control applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040AEX3-4.1 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) designs high-performance analog and mixed-signal ICs for precision, power, and interface applications across industrial, medical, and communications markets.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, battery-operated, and high-reliability systems requiring stable reference voltages from –40°C to +125°C.
FAQ
What is the exact output voltage tolerance of LM4040AEX3-4.1 at +25°C?
The LM4040AEX3-4.1 has a nominal output voltage of 4.096V with a maximum initial tolerance of ±4.1mV (±0.1%) at +25°C, as specified in the Electrical Characteristics table for the A-grade device. This tolerance is guaranteed by laser trimming and applies before temperature and load effects are considered.
Does LM4040AEX3-4.1 require an external output capacitor for stability?
No, the LM4040AEX3-4.1 does not require an external output capacitor. Its internal design ensures stability with any capacitive load-including 0pF-eliminating the need for external compensation and reducing BOM count and layout complexity in compact designs.
What is the minimum operating current for LM4040AEX3-4.1, and why is it important?
The LM4040AEX3-4.1 requires a minimum shunt current of 60μA to maintain regulation. Below this threshold, the device exits its reverse-breakdown region and output voltage collapses. Designers must size the series resistor to guarantee ≥60μA under worst-case conditions (min supply, max load).
How does the temperature coefficient affect LM4040AEX3-4.1 performance over its full operating range?
The LM4040AEX3-4.1 has a maximum temperature coefficient of ±100ppm/°C. Over –40°C to +125°C (ΔT = 165°C), this contributes up to ±16.5mV (±0.4%) additional error beyond initial tolerance-critical for applications requiring <0.5% total reference error across temperature.
Can LM4040AEX3-4.1 be used in automotive applications?
While LM4040AEX3-4.1 itself is not AEC-Q100 certified, it shares the same BiCMOS process and qualification baseline as AEC-Q100 variants like LM4040BIM3-2.5/V+T. Its –40°C to +125°C rating meets under-hood ambient requirements; however, formal automotive qualification requires selecting explicitly marked /V+ parts.
LM4040AEX3-4.1 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:
- ±0.1%
- 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 FAQ
1.How can I place an order for LM4040AEX3-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEX3-4.1 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 LM4040AEX3-4.1 reliable?
The price and inventory of LM4040AEX3-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AEX3-4.1 is usually 5 days.
3.What payment methods are accepted for LM4040AEX3-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEX3-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEX3-4.1?
LM4040AEX3-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEX3-4.1 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 LM4040AEX3-4.1?
For technical support, including LM4040AEX3-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEX3-4.1 requirements.
6.How does Aetrix verify that LM4040AEX3-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4040AEX3-4.1 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 LM4040AEX3-4.1 meets industry standards.
7.What is the process for return or replacement of LM4040AEX3-4.1?
All LM4040AEX3-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEX3-4.1, 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 LM4040AEX3-4.1 part is unused and in its original packaging.
Return procedure for LM4040AEX3-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040AEX3-4.1 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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