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Analog Devices Inc./Maxim Integrated LM4040AEM3-4.1
- Part No.:
- LM4040AEM3-4.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040AEM3-4.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,977
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Product details
Overview
LM4040AEM3-4.1 from Maxim Integrated is a precision 4.096V two-terminal shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±15ppm/°C temperature coefficient, 50µA to 15mA operating current range, and guaranteed operation from –40°C to +125°C. It serves as a stable reference for ADC/DAC biasing, sensor excitation, and portable power monitoring circuits.
For engineers reviewing the LM4040AEM3-4.1 datasheet, LM4040AEM3-4.1 pinout, LM4040AEM3-4.1 application, or LM4040AEM3-4.1 equivalent, key selection criteria include reverse breakdown voltage tolerance over temperature, dynamic impedance at low currents, wideband noise (64µVRMS), minimum operating current (50µA), and compatibility with capacitive loads without external stabilization.
Technical Context
The LM4040AEM3-4.1 implements a bandgap-based shunt reference architecture, functioning like a precision zener diode with fixed 4.096V reverse breakdown voltage. Its laser-trimmed resistor network ensures tight initial accuracy, while internal thermal compensation maintains stability across –40°C to +125°C.
It operates as a two-terminal device requiring only a series source resistor to regulate voltage under varying load conditions. No output capacitor is needed, and it remains stable with any capacitive load-enabling direct integration into space-constrained analog front-ends and battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Breakdown Voltage | 4.096V ±4.1mV at +25°C (A-grade); enables precise 12-bit ADC full-scale calibration |
| Initial Accuracy | 0.1% max (±4.1mV); eliminates need for system-level trimming in factory calibration |
| Temp Coefficient | ±15ppm/°C max; contributes ≤±0.62mV drift over –40°C to +125°C span |
| Operating Current | 50µA to 15mA; supports ultra-low-power sensor nodes and high-current reference buffers |
| Dynamic Impedance | 0.5Ω typical at 1mA; ensures <3mV output shift under 1mA load transients |
| Wideband Noise | 64µVRMS (10Hz–10kHz); suitable for 16-bit SAR ADC reference without additional filtering |
| Long-Term Stability | 120ppm after 1000h; guarantees reference integrity in sealed industrial modules |
Pinout & Package
LM4040AEM3-4.1 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 (cathode-side terminal) | Connects to regulated output node; sinks shunt current to maintain 4.096V |
| 2 (−) | Cathode (anode-side terminal) | Reference ground return; forms voltage drop across external source resistor |
| 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; no internal function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint saves >50% board area vs. SOT23 equivalents |
| No output capacitor required | Eliminates BOM cost and layout complexity for stability compensation |
| Capacitive load tolerance | Stable with any output capacitance-supports direct connection to ADC input caps |
| Low 64µVRMS noise | Enables high-resolution data acquisition without external low-noise filtering |
| Guaranteed –40°C to +125°C operation | Validated for automotive under-hood and industrial control environments |
Applications
| Portable Medical Sensors | Industrial PLC Analog Inputs |
|---|---|
Use Scenario: Battery-powered glucose meter with 12-bit ADC measuring electrochemical cell output. IC Role / Device Role / Timing Role: Provides stable 4.096V reference for ADC full-scale calibration and sensor biasing. Use Value: 0.1% initial accuracy and ±15ppm/°C TC ensure <±1 LSB error across medical operating temperature range. | Use Scenario: 4–20mA loop-powered transmitter conditioning analog sensor signals before digitization. IC Role / Device Role / Timing Role: Supplies precision excitation voltage to RTD/thermocouple signal conditioning circuitry. Use Value: 50µA minimum operating current allows operation from low-current loop supplies without auxiliary bias. |
| Automotive Cabin Control Units | Energy Meter Reference Subsystem |
Use Scenario: HVAC control module measuring cabin temperature and humidity with integrated ADC. IC Role / Device Role / Timing Role: Shunt reference for microcontroller's internal ADC reference input (VREF+). Use Value: Guaranteed –40°C to +125°C operation ensures reliability in dashboard-mounted electronics. | Use Scenario: Smart electricity meter using 24-bit delta-sigma ADC for revenue-grade energy measurement. IC Role / Device Role / Timing Role: Primary voltage reference for metrology ADC, replacing larger, higher-drift references. Use Value: 120ppm long-term stability meets IEC 62053-21 Class 0.2 accuracy requirements over 10-year field life. |
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; 100ppm/°C TC | Requires external resistor divider; less accurate and higher drift than LM4040AEM3-4.1 | Select when adjustable reference or higher voltage capability is required; not drop-in for fixed 4.096V use |
| ADR3440ARJZ-R7 | Fixed 4.096V; 0.1% accuracy; 30ppm/°C TC; SOT23-5; 100µA min current | Higher tempco and minimum current; larger package; serial interface not used | Choose if ADR34xx family sourcing or lower noise (4.8µVRMS) is prioritized over size and quiescent current |
Compared with TLVH431ACDBVR and ADR3440ARJZ-R7, LM4040AEM3-4.1 offers the smallest footprint, lowest minimum operating current (50µA), and tightest temperature coefficient (±15ppm/°C), making it optimal for space- and power-constrained precision analog systems requiring fixed 4.096V.
Availability
LM4040AEM3-4.1 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC analog inputs, and automotive cabin control units requiring stable component supply with guaranteed long-term availability.
Supply support for LM4040AEM3-4.1 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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained systems where stability, low drift, and zero-output-capacitor operation are critical design requirements.
FAQ
What is the exact reverse breakdown voltage of LM4040AEM3-4.1 at +25°C?
The LM4040AEM3-4.1 has a nominal reverse breakdown voltage of 4.096V at +25°C, with a guaranteed tolerance of ±4.1mV (0.1%) per the A-grade specification. This value is laser-trimmed during production and confirmed by 100% testing at room temperature.
Does LM4040AEM3-4.1 require an external output capacitor for stability?
No, LM4040AEM3-4.1 does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load, including direct connection to ADC input capacitors or long PCB traces-eliminating BOM cost and layout constraints associated with compensation networks.
What is the minimum operating current for LM4040AEM3-4.1, and why does it matter?
The LM4040AEM3-4.1 requires a minimum shunt current of 50µA to maintain regulation. This low threshold enables use in ultra-low-power applications such as battery-backed sensor nodes, where supply current budgets are limited to single-digit µA levels without compromising reference accuracy.
Can LM4040AEM3-4.1 be used in automotive under-hood applications?
Yes, LM4040AEM3-4.1 is qualified for operation from –40°C to +125°C and specified with ±15ppm/°C temperature coefficient-meeting requirements for non-critical automotive under-hood locations. Its SC70 package supports reflow soldering and is RoHS-compliant, aligning with automotive manufacturing standards.
How does the noise performance of LM4040AEM3-4.1 impact high-resolution ADC designs?
With 64µVRMS wideband noise (10Hz–10kHz), LM4040AEM3-4.1 contributes <0.015% of full-scale error to a 4.096V-referenced 16-bit ADC. This allows direct coupling to SAR or sigma-delta converters without additional filtering, preserving signal integrity in precision data acquisition systems.
LM4040AEM3-4.1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- SOT-23-3
LM4040AEM3-4.1 FAQ
1.How can I place an order for LM4040AEM3-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEM3-4.1 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 LM4040AEM3-4.1 reliable?
The price and inventory of LM4040AEM3-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AEM3-4.1 is usually 5 days.
3.What payment methods are accepted for LM4040AEM3-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEM3-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEM3-4.1?
LM4040AEM3-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEM3-4.1 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 LM4040AEM3-4.1?
For technical support, including LM4040AEM3-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEM3-4.1 requirements.
6.How does Aetrix verify that LM4040AEM3-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4040AEM3-4.1 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 LM4040AEM3-4.1 meets industry standards.
7.What is the process for return or replacement of LM4040AEM3-4.1?
All LM4040AEM3-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEM3-4.1, 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 LM4040AEM3-4.1 part is unused and in its original packaging.
Return procedure for LM4040AEM3-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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