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Analog Devices Inc./Maxim Integrated LM4040AIM3-2.1+T
- Part No.:
- LM4040AIM3-2.1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040AIM3-2.1+T.pdf
- Description:
- IC VREF SHUNT 2.048V SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,053
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Product details
Overview
LM4040AIM3-2.1+T from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SOT23-3 package, featuring 0.1% initial accuracy, ±100ppm/°C temperature coefficient, and stable operation from 60μA to 15mA shunt current. It delivers high-accuracy reference voltage for ADC/DAC biasing, battery-monitoring circuits, and portable power management systems.
For engineers reviewing the LM4040AIM3-2.1+T datasheet, LM4040AIM3-2.1+T pinout, LM4040AIM3-2.1+T application, or LM4040AIM3-2.1+T equivalent, this page provides verified electrical specs, thermal performance data, SC70/SOT23 package mapping, and validated alternatives for space-constrained industrial and automotive designs requiring stable 2.048V reference under -40°C to +85°C conditions.
Technical Context
The LM4040AIM3-2.1+T uses bandgap-based shunt architecture to maintain a precise 2.048V reverse breakdown voltage without external capacitors. Its laser-trimmed resistor network ensures 0.1% initial tolerance, while low dynamic impedance (≤0.8Ω at 1mA) sustains regulation across wide current and temperature ranges.
Guaranteed over -40°C to +85°C, it achieves ≤28μVRMS wideband noise (10Hz–10kHz) and tolerates any capacitive load. The device operates as a two-terminal active zener-cathode-anode conduction only-with no forward-bias functionality required in typical applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.048V ±2.0mV (0.1% grade, TA = +25°C); enables precise 12-bit ADC full-scale calibration |
| Initial Accuracy | ±0.1% max; eliminates need for system-level trimming in factory calibration flows |
| Tempco | ±100ppm/°C max; ensures ≤±8.2mV drift over -40°C to +85°C operating range |
| Shunt Current Range | 60μA to 15mA; supports ultra-low-power sensor nodes and high-current reference buffering |
| Dynamic Impedance | 0.3Ω to 0.8Ω (at 1mA, 120Hz); maintains <1mV output variation during load transients |
| Output Noise | 28μVRMS (10Hz–10kHz); meets SNR requirements for 16-bit SAR ADC reference inputs |
| Operating Temp Range | -40°C to +85°C; qualified for industrial control and consumer portable equipment |
Pinout & Package
Package: 3-pin SOT23 surface-mount (1.7mm × 2.9mm × 1.3mm), RoHS-compliant, tape-and-reel delivery (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias terminal; connects to regulated voltage node; sinks shunt current |
| 2 (–) | Anode | Reference ground return path; must be tied to system ground or low-impedance return |
| 3 (N.C.) | No Connection | Internally unconnected; must remain floating or tied to pin 2 per datasheet directive |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT23 footprint | 1.7mm × 2.9mm area saves >50% board space vs. legacy TO-92 or DIP references |
| No output capacitor required | Stable with any capacitive load up to 10µF; eliminates BOM cost and layout risk of external C |
| Low 28μVRMS noise | Enables direct use in high-resolution analog signal chains without additional filtering |
| 60μA min operating current | Supports micropower designs including coin-cell-powered IoT sensors and wearables |
| AEC-Q100 capability (via /V variants) | Validated for automotive subsystems; LM4040AIM3-2.1+T shares process and design with qualified versions |
Applications
| Battery Voltage Monitoring | Portable Medical Sensors |
|---|---|
|
Use Scenario: Real-time Li-ion cell voltage measurement in handheld glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for 12-bit ADC conversion of battery voltage divider output. Use Value: Enables ±5mV absolute voltage accuracy over full temperature range, critical for safe battery charge/discharge control. |
Use Scenario: Low-power ECG front-end with rail-to-rail input amplifiers and sigma-delta ADC. IC Role / Device Role / Timing Role: Supplies precision reference to ADC and programmable gain amplifier (PGA) bias networks. Use Value: 28μVRMS noise ensures ≥86dB SNR in 1kHz bandwidth, meeting ISO 13485 clinical signal fidelity requirements. |
| Industrial PLC Analog Input Modules | Automotive Cabin Control Units |
|
Use Scenario: 4–20mA loop-powered transmitter with HART modulation support. IC Role / Device Role / Timing Role: Sets accurate zero-point and span reference for DAC-driven current output stage. Use Value: 0.1% initial accuracy and ±100ppm/°C tempco ensure <0.2% total error over -40°C to +70°C ambient, satisfying IEC 61000-6-2 immunity compliance. |
Use Scenario: HVAC actuator position feedback using potentiometer wiper voltage scaling. IC Role / Device Role / Timing Role: Generates stable 2.048V reference for ratiometric measurement of potentiometer output. Use Value: Eliminates ratio errors caused by supply rail variation; supports AEC-Q100-compliant designs when paired with /V-grade variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431AIDBZR | 2.5V fixed reference; 0.5% initial accuracy; higher 300ppm/°C tempco; requires 80μA min current | Not suitable for 2.048V systems; lacks precision needed for 12-bit+ ADC calibration | Select only if 2.5V reference suffices and cost sensitivity outweighs accuracy requirements |
| MAX6002AEUR+T | 2.048V reference; 0.2% initial accuracy; ±50ppm/°C tempco; SC70-3 package; 100μA min current | Higher accuracy grade unavailable; tighter tempco but higher minimum current limits ultra-low-power use | Prefer for extended temp range (-40°C to +125°C) and lower drift, but verify 100μA startup in battery-critical designs |
Compared with TLV431AIDBZR and MAX6002AEUR+T, the LM4040AIM3-2.1+T uniquely combines 0.1% accuracy, 2.048V nominal output, and 60μA minimum current in SOT23 - making it optimal for high-precision, low-quiescent industrial and portable applications where reference voltage exactness directly impacts measurement validity.
Availability
LM4040AIM3-2.1+T is available at Aetrix Electronics and suitable for battery monitoring, portable medical devices, industrial PLC analog modules, and automotive cabin control units requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040AIM3-2.1+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 industrial, automotive, and communications markets, with emphasis on reliability, integration, and performance-per-watt.
The LM4040 product line delivers micropower, high-accuracy shunt references optimized for space-constrained systems needing stable voltage references without external compensation components.
FAQ
What is the guaranteed operating temperature range for LM4040AIM3-2.1+T?
The LM4040AIM3-2.1+T is specified and guaranteed over -40°C to +85°C ambient temperature. This range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official Maxim Integrated datasheet. Operation outside this range may result in parametric degradation or failure. For extended-range applications, consider the LM4040AEM3-2.1+T variant rated to +125°C.
Can LM4040AIM3-2.1+T be used without an external output capacitor?
Yes, the LM4040AIM3-2.1+T does not require an external output capacitor for stability and remains stable with any capacitive load, including values up to 10µF. This is explicitly stated in the General Description and Applications Information sections of the datasheet. Adding capacitance does not harm performance but provides no stability benefit - simplifying layout and reducing BOM count.
What is the minimum shunt current required for proper regulation of LM4040AIM3-2.1+T?
The LM4040AIM3-2.1+T requires a minimum shunt current of 60μA to maintain regulation within specifications. This value is confirmed in the Electrical Characteristics tables for the A-grade 2.048V version and applies across the full -40°C to +85°C temperature range. Below 60μA, output voltage deviation exceeds guaranteed limits, risking system-level measurement errors.
Is pin 3 of LM4040AIM3-2.1+T functional or should it be left unconnected?
Pin 3 of the LM4040AIM3-2.1+T is marked N.C. (No Connection) and must be left unconnected or tied directly to pin 2 (anode). The Pin Description section and Top View diagram in the datasheet explicitly state that pin 3 is internally unconnected. Connecting it to any other net - especially to supply or signal lines - violates the device's operational specification and may cause malfunction.
How does the 0.1% initial accuracy of LM4040AIM3-2.1+T translate to absolute voltage tolerance at +25°C?
At +25°C, the 0.1% initial accuracy of LM4040AIM3-2.1+T corresponds to ±2.0mV tolerance around its nominal 2.048V output - i.e., 2.046V to 2.050V. This is directly specified in the "Electrical Characteristics-2.048V" table under Reverse Breakdown Voltage (VR) for the LM4040A grade. This tight tolerance eliminates post-assembly calibration in many high-accuracy measurement systems.
LM4040AIM3-2.1+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 ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040AIM3-2.1+T FAQ
1.How can I place an order for LM4040AIM3-2.1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AIM3-2.1+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 LM4040AIM3-2.1+T reliable?
The price and inventory of LM4040AIM3-2.1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AIM3-2.1+T is usually 5 days.
3.What payment methods are accepted for LM4040AIM3-2.1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AIM3-2.1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AIM3-2.1+T?
LM4040AIM3-2.1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AIM3-2.1+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 LM4040AIM3-2.1+T?
For technical support, including LM4040AIM3-2.1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AIM3-2.1+T requirements.
6.How does Aetrix verify that LM4040AIM3-2.1+T is sourced from the original manufacturer or authorized distributors?
All LM4040AIM3-2.1+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 LM4040AIM3-2.1+T meets industry standards.
7.What is the process for return or replacement of LM4040AIM3-2.1+T?
All LM4040AIM3-2.1+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AIM3-2.1+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 LM4040AIM3-2.1+T part is unused and in its original packaging.
Return procedure for LM4040AIM3-2.1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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