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Analog Devices Inc./Maxim Integrated LM4040BEM3-2.1+T
- Part No.:
- LM4040BEM3-2.1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040BEM3-2.1+T.pdf
- Description:
- IC VREF SHUNT 2.048V SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,621
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Product details
Overview
LM4040BEM3-2.1+T from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, featuring 0.2% initial accuracy, ±100ppm/°C temperature coefficient, and guaranteed operation from −40°C to +125°C. It delivers stable reverse-breakdown voltage across 60μA–15mA shunt current, with low 28μVRMS noise (10Hz–10kHz), no external capacitor required, and tolerance for capacitive loads - ideal for high-reliability power management in automotive and industrial sensor signal chains.
For engineers reviewing the LM4040BEM3-2.1+T datasheet, LM4040BEM3-2.1+T pinout, LM4040BEM3-2.1+T application, or LM4040BEM3-2.1+T equivalent, key selection criteria include its AEC-Q100-qualified extended temperature range, micropower operation down to 60μA, fixed 2.048V output optimized for 12-bit ADC references, and SC70 footprint compatibility with space-constrained portable systems.
Technical Context
The LM4040BEM3-2.1+T implements a bandgap-based shunt reference architecture, functioning as a precision two-terminal device that maintains a stable 2.048V reverse breakdown voltage when biased with 60μA–15mA cathode-to-anode current. Its laser-trimmed internal resistor ensures 0.2% initial accuracy at +25°C, while the ±100ppm/°C tempco guarantees stability over −40°C to +125°C.
Unlike series references, it requires no input supply rail - instead sinking variable current through an external series resistor to regulate voltage across its terminals. It exhibits low dynamic impedance (0.3–0.8Ω at 1mA), minimal load regulation error (≤1.0mV over 60μA–1mA), and inherent stability with any capacitive load - eliminating need for output capacitance or compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±4.0mV (±0.2%) initial tolerance at +25°C - enables direct use with 2.048V full-scale ADCs without scaling resistors. |
| Temperature Coefficient | ±100ppm/°C max over −40°C to +125°C - contributes ≤±10.4mV drift across full range, critical for automotive cabin sensors. |
| Shunt Current Range | 60μA to 15mA - supports ultra-low-power battery monitoring (e.g., 60μA quiescent) and higher-current analog front-ends (e.g., 10mA DAC biasing). |
| Dynamic Impedance | 0.3Ω to 0.8Ω at 1mA - ensures <1mV output shift under 1mA load transients, vital for precision instrumentation amplifiers. |
| Wideband Noise | 28μVRMS (10Hz–10kHz) - meets SNR requirements for 16-bit SAR ADCs without additional filtering. |
| Long-Term Stability | 120ppm after 1000 hours - translates to ~0.25mV drift over lifetime, supporting 10-year industrial calibration intervals. |
| Operating Temperature | −40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive applications. |
Pinout & Package
LM4040BEM3-2.1+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23, with RoHS-compliant lead-free finish and tape-and-reel packaging (+T suffix). Pin 3 is NC and must remain unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Positive terminal; connects to regulated voltage node - sinks all shunt current to maintain 2.048V across load. |
| 2 (–) | Anode | Negative terminal; ties to system ground or low-side return path - completes shunt current loop. |
| 3 (N.C.) | No Connection | Internally unconnected; must be left floating or shorted to pin 2 - no electrical function, avoids parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - saves >50% PCB space vs. SOT23, enabling dense layout in wearable medical sensors. |
| No output capacitor required | Fully stable with 0–10µF capacitive loads - eliminates BOM cost, board area, and aging-related drift from electrolytic caps. |
| Micropower minimum operating current | 60μA - allows operation from coin cells or energy-harvesting sources in always-on IoT endpoints. |
| AEC-Q100 qualified | Grade 1 (−40°C to +125°C) - validated for automotive body electronics, including door modules and lighting controllers. |
| Low 28μVRMS noise | 10Hz–10kHz bandwidth - supports high-resolution data acquisition without post-filtering, reducing firmware complexity. |
Applications
| Automotive Cabin Sensors | Portable Medical Monitors |
|---|---|
Use Scenario: Reference for thermistor-based cabin temperature sensing in HVAC control units. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.048V excitation and ADC reference for ratiometric measurement. Use Value: Enables ±0.1°C measurement accuracy over −40°C to +85°C ambient, meeting ISO 16750-4 requirements. | Use Scenario: Precision reference for ECG front-end ADCs in handheld patient monitors. IC Role / Device Role / Timing Role: Low-noise 2.048V reference for 16-bit SAR ADC sampling biopotential signals. Use Value: Delivers 86dB SNR without external filtering, supporting diagnostic-grade waveform fidelity. |
| Industrial Process Transmitters | Battery Fuel Gauging |
Use Scenario: Reference for 4–20mA loop-powered pressure transmitters in oil & gas field instruments. IC Role / Device Role / Timing Role: Micropower shunt reference regulating loop voltage while supplying sensor excitation and ADC reference. Use Value: Operates reliably at 60μA quiescent current, preserving loop margin for HART communication. | Use Scenario: Reference for coulomb counter ICs measuring Li-ion battery voltage in smart power tools. IC Role / Device Role / Timing Role: Stable 2.048V reference for fuel gauge ADCs tracking cell voltage during charge/discharge cycles. Use Value: Maintains ±0.5% state-of-charge accuracy over full temperature range and 500-cycle lifetime. |
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 tempco; 1mA min current. | Requires two external resistors for 2.048V setting; higher minimum current limits ultra-low-power use. | Select when adjustable output or higher voltage capability (up to 18V) is needed; not drop-in for fixed 2.048V SC70 designs. |
| MAX6008AEUR+T | Fixed 2.048V; 0.1% accuracy; SC70-3; 50ppm/°C tempco; −40°C to +85°C range; 10μA min current. | Narrower temperature range; superior accuracy and tempco but not AEC-Q100 qualified. | Select for commercial-grade applications demanding tighter specs; avoid where automotive qualification or extended temp range is mandatory. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4040BEM3-2.1+T uniquely combines AEC-Q100 Grade 1 qualification, fixed 2.048V output, SC70 size, and 60μA minimum current - making it the only option qualified for automotive under-hood use without design compromises.
Availability
LM4040BEM3-2.1+T is available at Aetrix Electronics and suitable for automotive cabin control, portable medical instrumentation, industrial 4–20mA transmitters, and battery fuel gauging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040BEM3-2.1+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, now part of Analog Devices, designs precision analog and mixed-signal ICs for automotive, industrial, communications, and computing markets.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references targeting space-constrained, high-reliability applications such as automotive sensors, portable instrumentation, and loop-powered industrial systems.
FAQ
What is the exact output voltage tolerance of LM4040BEM3-2.1+T at +25°C?
The LM4040BEM3-2.1+T has a nominal output voltage of 2.048V with ±4.0mV (±0.2%) initial tolerance at +25°C, as specified in the Electrical Characteristics table for the B-grade device. This tolerance remains valid across the full −40°C to +125°C operating range when combined with its ±100ppm/°C temperature coefficient.
Does LM4040BEM3-2.1+T require an external output capacitor for stability?
No, LM4040BEM3-2.1+T does not require an external output capacitor. Its internal design ensures stability with any capacitive load from 0 to 10µF, eliminating the need for external components and avoiding reliability risks associated with capacitor aging or ESR variation.
What is the minimum shunt current needed for proper regulation of LM4040BEM3-2.1+T?
The LM4040BEM3-2.1+T requires a minimum shunt current of 60μA to maintain regulation across its full operating temperature range. Below this threshold, output voltage may deviate beyond specification - critical for ultra-low-power battery monitoring circuits where current budget is constrained.
Is LM4040BEM3-2.1+T qualified for automotive applications?
Yes, LM4040BEM3-2.1+T is AEC-Q100 qualified (Grade 1) for operation from −40°C to +125°C, making it suitable for automotive cabin and under-hood applications including HVAC sensors, lighting controllers, and body electronics modules.
What package type and dimensions does LM4040BEM3-2.1+T use?
LM4040BEM3-2.1+T uses the SC70-3 surface-mount package measuring 1.8mm × 1.8mm × 0.9mm, with pin 1 marked by a dot and pin 3 designated as no-connect (must be left floating or tied to pin 2). The "+T" suffix indicates RoHS-compliant, tape-and-reel packaging.
LM4040BEM3-2.1+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:
- ±0.2%
- 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
LM4040BEM3-2.1+T FAQ
1.How can I place an order for LM4040BEM3-2.1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BEM3-2.1+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 LM4040BEM3-2.1+T reliable?
The price and inventory of LM4040BEM3-2.1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BEM3-2.1+T is usually 5 days.
3.What payment methods are accepted for LM4040BEM3-2.1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BEM3-2.1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BEM3-2.1+T?
LM4040BEM3-2.1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BEM3-2.1+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 LM4040BEM3-2.1+T?
For technical support, including LM4040BEM3-2.1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BEM3-2.1+T requirements.
6.How does Aetrix verify that LM4040BEM3-2.1+T is sourced from the original manufacturer or authorized distributors?
All LM4040BEM3-2.1+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 LM4040BEM3-2.1+T meets industry standards.
7.What is the process for return or replacement of LM4040BEM3-2.1+T?
All LM4040BEM3-2.1+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BEM3-2.1+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 LM4040BEM3-2.1+T part is unused and in its original packaging.
Return procedure for LM4040BEM3-2.1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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