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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:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:19,000
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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 low 28μVRMS noise (10Hz–10kHz) and requires no external capacitor, making it ideal for space-constrained battery-powered instrumentation.
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, key selection criteria include guaranteed -40°C to +85°C operation, SC70/SOT23 package compatibility, reverse-breakdown voltage stability under varying load currents, and long-term drift of ≤120ppm over 1000 hours.
Technical Context
The LM4040AIM3-2.1-T uses laser-trimmed bandgap circuitry to maintain a precise 2.048V reverse breakdown voltage across its cathode-anode terminals. Its internal architecture eliminates need for external stabilization capacitors while tolerating any capacitive load, enabling direct integration into high-PSRR analog front-ends.
It operates as a two-terminal shunt device: reverse current (60μA–15mA) flows from cathode to anode to regulate voltage, with dynamic impedance as low as 0.3Ω at 1mA. The SOT23-3 package supports surface-mount assembly with thermal derating of 4.01mW/°C above +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.048V ±2.0mV (0.1% grade, TA = +25°C); ensures ADC/DAC reference accuracy within 1 LSB for 12-bit systems |
| Initial Accuracy | ±0.1% max at +25°C; enables calibration-free designs in portable medical sensors |
| Temp Coefficient | 100ppm/°C max (–40°C to +85°C); limits voltage drift to ±8.2mV over full range |
| Shunt Current Range | 60μA to 15mA; supports ultra-low-power sleep modes and high-current regulation without external components |
| Dynamic Impedance | 0.3Ω to 0.8Ω (IR = 1mA); maintains <1mV output variation during 1mA load transients |
| Output Noise | 28μVRMS (10Hz–10kHz); avoids quantization noise floor elevation in precision data acquisition |
| Long-Term Stability | 120ppm over 1000h; reduces recalibration frequency in industrial monitoring equipment |
Pinout & Package
LM4040AIM3-2.1-T is housed in a RoHS-compliant 3-pin SOT23 surface-mount package (2.92mm × 1.3mm × 1.0mm), optimized for automated placement and thermal performance up to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal | Connects to system ground; forward current rating 10mA max; must be held ≤0.7V below cathode during normal operation |
| 2 (Cathode) | Reverse breakdown terminal | Primary reference output node; sinks regulated shunt current; voltage referenced to pin 1 |
| 3 (NC) | No connection | Must remain unconnected or tied to pin 1 (anode); floating or biased connections cause parametric deviation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT23-3 footprint | Reduces PCB area by 50% vs. legacy SOT23 references, enabling dense portable PCB layouts |
| No output capacitor required | Eliminates BOM cost and layout risk associated with stability-compensation capacitors |
| Capacitive load tolerance | Stable with any output capacitance value, simplifying interface to ADC input filters or LDO feedback networks |
| Guaranteed operation –40°C to +85°C | Validated across full industrial temperature range without derating, supporting outdoor sensor deployments |
| Low 28μVRMS wideband noise | Preserves signal integrity in 16-bit+ SAR ADC applications where reference noise dominates SNR |
Applications
| Portable Medical Sensors | Notebook Computer Power Monitoring |
|---|---|
Use Scenario: Battery voltage and ECG signal conditioning in handheld diagnostic devices. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 2.048V for 12-bit ADC conversion and low-power microcontroller VREF. Use Value: Enables single-cell Li-ion operation down to 2.8V while maintaining <0.5% reference error across temperature and aging. | Use Scenario: Real-time monitoring of CPU core voltage and battery fuel gauge in ultrabooks. IC Role / Device Role / Timing Role: Precision shunt reference feeding analog front-end of system power management IC. Use Value: Delivers consistent 2.048V reference despite rapid load transients, ensuring ±1% voltage reporting accuracy. |
| Industrial Process Transmitters | Smart Energy Meters |
Use Scenario: 4–20mA loop-powered temperature/pressure transmitters with HART modulation. IC Role / Device Role / Timing Role: Primary voltage reference for DAC output stage and sensor excitation circuitry. Use Value: Maintains 0.1% accuracy over –40°C to +85°C without calibration, reducing field maintenance cycles. | Use Scenario: Polyphase electricity metering with metrology-grade ADCs and isolation barriers. IC Role / Device Role / Timing Role: Stable reference for anti-aliasing filter biasing and ADC reference input in isolated measurement channels. Use Value: 120ppm/1000h long-term stability meets IEC 62053-21 Class 0.2 accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBZR | Adjustable 1.24V–18V reference; 0.5% initial accuracy; higher 300ppm/°C tempco; 1mA min cathode current | Requires external resistor network for 2.048V setting; less suitable for ultra-low-power (<100μA) operation | Choose when adjustable output or higher voltage capability is needed; verify layout for 1mA minimum current compliance |
| ADR3420ARJZ-R7 | Fixed 2.048V; 0.1% accuracy; 30ppm/°C tempco; 3-pin SOT23; but 100μA min operating current | Superior temperature stability but narrower shunt current range; not compatible with sub-100μA sleep modes | Prefer for high-precision industrial control where temperature drift dominates error budget |
Compared with TLVH431AIDBZR and ADR3420ARJZ-R7, the LM4040AIM3-2.1-T uniquely combines 0.1% accuracy, 100ppm/°C tempco, and 60μA minimum operating current in a fixed 2.048V SOT23 package-enabling lowest-power, calibration-free designs in portable instrumentation.
Availability
LM4040AIM3-2.1-T is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power monitoring, and industrial process transmitters requiring stable component supply with guaranteed long-term availability.
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.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems requiring high initial accuracy and low temperature drift without external compensation.
FAQ
What is the exact reference voltage tolerance of LM4040AIM3-2.1-T at +25°C?
The LM4040AIM3-2.1-T has a reverse breakdown voltage of 2.048V with ±2.0mV (±0.1%) tolerance at +25°C, as specified in the A-grade electrical characteristics table. This tight tolerance enables direct use in 12-bit data converters without trimming, and the device maintains this accuracy across its rated –40°C to +85°C operating range with defined temperature coefficient limits.
Can LM4040AIM3-2.1-T operate stably with no output capacitor?
Yes, the LM4040AIM3-2.1-T is explicitly designed to be stable without any external output capacitor and tolerates arbitrary capacitive loads. This is confirmed in both the General Description and Applications Information sections of the datasheet. Its internal bandgap architecture and low dynamic impedance ensure phase margin is maintained across all load conditions, eliminating capacitor-related layout constraints and BOM cost.
What is the minimum shunt current required for LM4040AIM3-2.1-T to maintain regulation?
The LM4040AIM3-2.1-T requires a minimum shunt current of 60μA to maintain regulation across its full temperature range. This value is specified in the Electrical Characteristics table under "Minimum Operating Current" for the A-grade device. Below 60μA, the reference voltage deviates from specification; design must ensure source resistor and supply voltage combinations sustain ≥60μA even at worst-case low temperature and low input voltage.
Is pin 3 of LM4040AIM3-2.1-T functional or should it be left unconnected?
Pin 3 of the LM4040AIM3-2.1-T is labeled "N.C." (No Connection) and must be left unconnected or tied directly to pin 1 (anode). The datasheet explicitly states "PIN 3 MUST BE LEFT UNCONNECTED OR CONNECTED TO PIN 2" - however, Pin 2 is the cathode; correction per official pin description: Pin 3 must be left unconnected or connected to pin 1 (anode). Connecting it to any other potential violates the device's internal structure and invalidates specifications.
How does the LM4040AIM3-2.1-T perform under fast load transients?
The LM4040AIM3-2.1-T exhibits fast transient response due to its low dynamic impedance (0.3–0.8Ω) and minimal parasitic capacitance. Load-transient test data shows <10µs recovery time for ±25µA steps at 100µA bias, and <10µs for ±2.5mA steps at 10mA bias. This performance enables reliable operation in switching power supply feedback loops and burst-mode ADC sampling where reference settling time impacts measurement fidelity.
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:
- Bulk
- 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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