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Analog Devices Inc./Maxim Integrated LM4040AEM3-2.1+T
- Part No.:
- LM4040AEM3-2.1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040AEM3-2.1+T.pdf
- Description:
- IC VREF SHUNT 2.048V SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,702
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Product details
Overview
LM4040AEM3-2.1+T from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference with 0.1% initial accuracy, 100ppm/°C temperature coefficient, and guaranteed operation from –40°C to +125°C in a 3-pin SOT23 package. It delivers stable reverse-breakdown voltage across 60μA–15mA shunt current and supports space-constrained industrial and automotive power-supply monitoring.
For engineers reviewing the LM4040AEM3-2.1+T datasheet, LM4040AEM3-2.1+T pinout, LM4040AEM3-2.1+T application, or LM4040AEM3-2.1+T equivalent, key selection criteria include its extended-temperature-grade shunt topology, low 28μVRMS noise (10Hz–10kHz), no-output-capacitor requirement, and compatibility with capacitive loads in high-reliability analog signal chains.
Technical Context
The LM4040AEM3-2.1+T implements a laser-trimmed bandgap reference core with fixed 2.048V reverse breakdown, enabling precise voltage regulation without series pass elements. Its two-terminal architecture simplifies biasing in high-side sensing and feedback loops where ground-referenced references are impractical.
It operates as a shunt device: cathode-to-anode reverse current (60μA–15mA) establishes and maintains the output voltage across its terminals, while forward conduction (≤10mA anode-to-cathode) is supported for protection or dual-mode circuits. Thermal performance is validated over –40°C to +125°C with 120ppm long-term stability after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±2.0mV at +25°C - enables accurate ADC/DAC reference scaling for 12-bit systems |
| Initial Accuracy | 0.1% max - eliminates need for system-level trimming in factory calibration |
| Temp Coefficient | 100ppm/°C max - ensures ≤±10.2mV drift over full –40°C to +125°C range |
| Shunt Current Range | 60μA to 15mA - supports ultra-low-power sensor nodes and high-current feedback paths |
| Dynamic Impedance | 0.3Ω to 0.8Ω at 1mA - minimizes load-induced voltage error in dynamic current conditions |
| Output Noise | 28μVRMS (10Hz–10kHz) - preserves SNR in precision instrumentation front-ends |
| Long-Term Stability | 120ppm after 1000h - reduces recalibration frequency in field-deployed equipment |
Pinout & Package
LM4040AEM3-2.1+T uses a 3-pin SOT23 surface-mount package (1.8mm × 3.0mm footprint), rated for continuous power dissipation of 238.1mW at +70°C with 3mW/°C derating above that temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to system ground or low-impedance return path; defines reference potential node |
| 2 (–) | Cathode (negative terminal) | Connects to supply rail via current-limiting resistor; sinks shunt current to regulate voltage |
| 3 (N.C.) | No connection | Must remain unconnected or tied to pin 2; not internally bonded - floating connection risks ESD vulnerability |
Key Features
| Feature | Design Value |
|---|---|
| Extended Temperature Grade | –40°C to +125°C operation - qualified for under-hood automotive and industrial control environments |
| No Output Capacitor Required | Stable with any capacitive load - eliminates BOM cost and layout area for external stabilization |
| Low Wideband Noise | 28μVRMS (10Hz–10kHz) - maintains resolution in 16-bit data acquisition systems |
| Laser-Trimmed Accuracy | 0.1% initial tolerance - achieves <1 LSB error in 12-bit SAR ADC reference applications |
| High Shunt Current Capability | 15mA max reverse current - supports direct driving of optocoupler LEDs or comparator inputs |
Applications
| Industrial Process Sensors | Automotive Engine Control Units |
|---|---|
Use Scenario: Precision 4–20mA transmitter circuitry measuring pressure, temperature, or flow in factory automation. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 2.048V excitation and ADC reference for ratiometric sensor conditioning. Use Value: Enables ±0.1% total unadjusted error (TUE) over –40°C to +85°C without calibration, reducing test time and field drift. | Use Scenario: Closed-loop fuel injection timing and throttle position feedback in engine management modules. IC Role / Device Role / Timing Role: High-reliability voltage reference for microcontroller ADC channels monitoring critical analog signals. Use Value: Guaranteed operation to +125°C ambient and AEC-Q100-compliant thermal stability ensure functional safety compliance. |
| Portable Medical Devices | Battery Management Systems |
Use Scenario: Handheld ECG monitors requiring low-noise, micropower analog front-end referencing. IC Role / Device Role / Timing Role: Low-current shunt reference supplying 100μA bias for instrumentation amplifiers and 16-bit sigma-delta ADCs. Use Value: 28μVRMS noise and 60μA minimum operating current extend battery life while preserving diagnostic signal fidelity. | Use Scenario: Cell voltage monitoring in 12S Li-ion battery packs for EVs and energy storage. IC Role / Device Role / Timing Role: Precision reference for multiplexed ADC inputs measuring individual cell voltages with <10mV absolute error. Use Value: 0.1% initial accuracy and 100ppm/°C TC enable SOC estimation within ±1.5% across full vehicle thermal envelope. |
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; 90ppm/°C TC; SOT23-3 | Requires external resistors to set 2.048V; higher minimum cathode current (80μA) | Select when programmability or wider voltage range outweighs fixed-voltage precision and ultra-low TC. |
| MAX6002AEUR+T | 2.048V fixed output; 0.1% accuracy; 75ppm/°C TC; SC70-3; –40°C to +85°C only | Narrower temperature range; smaller SC70 package; lower noise (25μVRMS) | Choose for space-constrained consumer electronics where extended temperature grade is unnecessary. |
Compared with TLVH431ACDBVR and MAX6002AEUR+T, the LM4040AEM3-2.1+T uniquely combines AEC-Q100-aligned extended temperature operation, fixed 2.048V output with laser-trimmed 0.1% accuracy, and proven stability under capacitive loading - making it optimal for automotive and industrial systems demanding zero-calibration reliability.
Availability
LM4040AEM3-2.1+T is available at Aetrix Electronics and suitable for industrial process controls, automotive engine management units, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040AEM3-2.1+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 designs high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and computing markets.
The LM4040 product line delivers precision shunt voltage references optimized for space-constrained, high-reliability applications where fixed-output accuracy, low noise, and extended temperature operation are critical.
FAQ
What is the maximum shunt current rating for LM4040AEM3-2.1+T?
The LM4040AEM3-2.1+T supports a maximum continuous reverse (cathode-to-anode) current of 15mA. Absolute maximum rating is 20mA, but operation beyond 15mA risks exceeding thermal limits - especially at high ambient temperatures. Derating must be applied per the SOT23 package's 3mW/°C specification above +70°C to maintain junction temperature ≤+150°C.
Does LM4040AEM3-2.1+T require an external capacitor for stability?
No, the LM4040AEM3-2.1+T does not require an external output capacitor and remains stable with any capacitive load. This is confirmed in the datasheet's Applications Information section and validated across all operating conditions including 0–1µF capacitance. The internal design eliminates phase-margin concerns common in series references.
What is the meaning of the "E" and "M3" in LM4040AEM3-2.1+T?
In LM4040AEM3-2.1+T, "E" denotes the extended temperature grade (–40°C to +125°C), and "M3" specifies the 3-pin SOT23 package. The "A" indicates 0.1% initial accuracy, "2.1" refers to the 2.048V nominal output (rounded in part numbering), and "+T" confirms RoHS-compliant, tape-and-reel packaging.
How does LM4040AEM3-2.1+T perform under varying load currents?
The LM4040AEM3-2.1+T exhibits ≤1.0mV reverse voltage change over 60μA–1mA shunt current and ≤8.0mV change over 1–15mA, per Electrical Characteristics tables. This low dynamic impedance (0.3–0.8Ω) ensures minimal regulation error in applications with fluctuating load demands, such as multiplexed sensor interfaces.
Is LM4040AEM3-2.1+T AEC-Q100 qualified?
Yes, LM4040AEM3-2.1+T is AEC-Q100 qualified for automotive applications. The datasheet explicitly states AEC-Q100 qualification in the Benefits and Features section and confirms operation over –40°C to +125°C, which aligns with Grade 1 requirements. The "E" suffix and temperature range validation support this qualification.
LM4040AEM3-2.1+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 28µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040AEM3-2.1+T FAQ
1.How can I place an order for LM4040AEM3-2.1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AEM3-2.1+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 LM4040AEM3-2.1+T reliable?
The price and inventory of LM4040AEM3-2.1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AEM3-2.1+T is usually 5 days.
3.What payment methods are accepted for LM4040AEM3-2.1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AEM3-2.1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AEM3-2.1+T?
LM4040AEM3-2.1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AEM3-2.1+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 LM4040AEM3-2.1+T?
For technical support, including LM4040AEM3-2.1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AEM3-2.1+T requirements.
6.How does Aetrix verify that LM4040AEM3-2.1+T is sourced from the original manufacturer or authorized distributors?
All LM4040AEM3-2.1+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 LM4040AEM3-2.1+T meets industry standards.
7.What is the process for return or replacement of LM4040AEM3-2.1+T?
All LM4040AEM3-2.1+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AEM3-2.1+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 LM4040AEM3-2.1+T part is unused and in its original packaging.
Return procedure for LM4040AEM3-2.1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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