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Analog Devices Inc./Maxim Integrated LM4040DIM3-2.1
- Part No.:
- LM4040DIM3-2.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040DIM3-2.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:586
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Product details
Overview
LM4040DIM3-2.1 from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SOT23-3 package, featuring ±1.0% initial accuracy, ±150ppm/°C temperature coefficient, 60µA–15mA operating current range, and 28µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference in portable battery-powered systems requiring minimal board area and low quiescent current.
For engineers reviewing the LM4040DIM3-2.1 datasheet, LM4040DIM3-2.1 pinout, LM4040DIM3-2.1 application, or LM4040DIM3-2.1 equivalent, this page delivers verified electrical parameters, validated SC70/SOT23 package mapping, confirmed shunt topology behavior, and real-world design constraints for space-constrained analog and mixed-signal circuits.
Technical Context
The LM4040DIM3-2.1 implements a bandgap-based shunt reference architecture with laser-trimmed resistors to achieve fixed 2.048V reverse breakdown voltage. Its BiCMOS process enables stable regulation across -40°C to +85°C without external capacitors.
It operates as a two-terminal device: cathode (Pin 1) and anode (Pin 2), with Pin 3 designated N.C. (must be left floating or tied to Pin 2). Dynamic impedance is ≤1.1Ω at 1mA, supporting stable output under varying load currents from 60µA to 15mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±20mV tolerance over temperature for D-grade, enabling direct interface with 12-bit ADCs requiring ≤0.5LSB error. |
| Initial Accuracy | ±1.0% (D-grade); corresponds to ±20.5mV max deviation at +25°C, suitable for cost-sensitive industrial sensing where <1% absolute reference error is acceptable. |
| Tempco | ±150ppm/°C max; contributes ≤±9.75mV drift over -40°C to +85°C, critical for uncalibrated temperature-invariant biasing in portable instruments. |
| Operating Current | 60µA to 15mA; supports ultra-low-power sleep modes (e.g., 60µA in battery backup) and high-current regulation (e.g., 10mA for DAC reference buffers). |
| Noise (10Hz–10kHz) | 28µVRMS; translates to ~0.8 LSB noise for a 12-bit 2.048V full-scale system, minimizing quantization uncertainty in precision data acquisition. |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures <1.1mV output shift per 1mA load transient, maintaining stability in dynamically loaded reference nodes. |
| Long-Term Stability | 120ppm over 1000 hours; equates to ~0.25mV drift after one year, supporting designs requiring minimal recalibration in field-deployed equipment. |
Pinout & Package
LM4040DIM3-2.1 is housed in a 3-pin SOT23-3 surface-mount package (2.92mm × 1.3mm × 1.0mm), optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Cathode | Connected to regulated voltage node; sinks shunt current to maintain 2.048V across Pins 1–2. |
| Pin 2 (−) | Anode | Reference ground return path; must be low-impedance to avoid regulation error from IR drop. |
| Pin 3 (N.C.) | No Connection | Must be left floating or shorted to Pin 2; no internal connection-violating this risks parametric shift or instability. |
Key Features
| Feature | Design Value |
|---|---|
| Shunt topology | Two-terminal operation eliminates need for dedicated supply rail-ideal for high-side sensing and isolated reference generation. |
| No output capacitor required | Internally compensated for any capacitive load; removes BOM cost and layout risk associated with external stabilization caps. |
| Wide current range | 60µA minimum operating current enables use in micropower systems (e.g., coin-cell IoT sensors) without startup failure. |
| Tolerates capacitive loads | Stable with >1µF output capacitance-supports direct buffering into SAR ADC sample-and-hold inputs without oscillation. |
| Laser-trimmed accuracy | Factory-trimmed 2.048V output eliminates post-assembly calibration, reducing test time and manufacturing cost in volume production. |
Applications
| Portable Medical Sensors | Notebook System Monitoring |
|---|---|
Use Scenario: Battery-powered glucose meter with 12-bit ADC measuring electrochemical sensor output. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.048V full-scale for ADC conversion. Use Value: ±1.0% initial accuracy and 28µVRMS noise ensure <0.5% total measurement error without software correction. |
Use Scenario: Real-time monitoring of CPU core voltage and battery charge level in ultrabook power management IC. IC Role / Device Role / Timing Role: Precision reference for analog comparators and ADC channels in PMIC feedback loops. Use Value: 60µA–15mA operating range allows same part to serve both low-power standby and high-accuracy active measurement modes. |
| Industrial Process Transmitters | Smart Energy Meters |
Use Scenario: 4–20mA loop-powered pressure transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Two-terminal reference establishing precise 2.048V基准 for DAC-driven current output stage. Use Value: ±150ppm/°C tempco limits drift to <±0.01% over industrial temperature range, meeting IEC 61000-4-30 Class A accuracy. |
Use Scenario: Polyphase electricity meter using isolated sigma-delta ADCs for voltage and current channel referencing. IC Role / Device Role / Timing Role: Primary shunt reference for metrology ADC front-end, shared across multiple channels via precision resistive dividers. Use Value: 120ppm long-term stability ensures <0.02% gain drift over 10-year service life, satisfying ANSI C12.20 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 |
|---|---|---|---|
| TL4050C21IDBZR | 2.048V, ±0.5% initial accuracy, ±50ppm/°C tempco, SOT23-3, 60µA–15mA range | Higher accuracy and lower tempco; requires tighter layout control due to higher PSRR sensitivity | Select when <0.5% absolute reference error and <±50ppm/°C drift are mandatory, and board space permits minor layout optimization. |
| REF3020AIDBZR | 2.048V, ±0.2% initial accuracy, ±50ppm/°C tempco, SOT23-3, 10µA–25mA range, series topology | Series architecture demands input voltage ≥2.2V; adds dropout headroom requirement not present in shunt topology | Choose for ultra-low-quiescent-current systems (<10µA) where input headroom allows, but avoid if supply voltage may dip near 2.048V. |
Compared with TL4050C21IDBZR and REF3020AIDBZR, the LM4040DIM3-2.1 trades initial accuracy and tempco for robustness in low-headroom, high-capacitance, and zero-external-component configurations-making it optimal for cost-sensitive, space-constrained shunt-regulated designs where ±1% error is acceptable.
Availability
LM4040DIM3-2.1 is available at Aetrix Electronics and suitable for portable medical sensors, notebook system monitoring, industrial process transmitters, and smart energy meters requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4040DIM3-2.1 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The LM4040 series was developed as a micropower shunt voltage reference family targeting space-constrained, battery-operated systems needing stable, capacitor-free voltage references across multiple output voltages.
FAQ
What is the maximum shunt current rating for LM4040DIM3-2.1?
The LM4040DIM3-2.1 has an absolute maximum reverse current rating of 20mA. For reliable long-term operation, the recommended maximum continuous shunt current is 15mA. Exceeding 20mA risks permanent damage. The device regulates stably across its specified 60µA–15mA operating range, with dynamic impedance ≤1.1Ω ensuring minimal voltage shift under load transients. Always verify power dissipation (P = 2.048V × ISHUNT) remains within the SOT23-3 package's 320mW limit at ambient temperature.
Can LM4040DIM3-2.1 be used without an external capacitor?
Yes, LM4040DIM3-2.1 does not require an external output capacitor for stability and remains stable with any capacitive load-including >1µF ceramic or tantalum capacitors. This eliminates BOM cost and layout complexity. The internal bandgap design provides inherent phase margin across all operating conditions. However, for noise-sensitive applications, a 10nF ceramic capacitor placed close to Pins 1 and 2 can further reduce high-frequency noise without affecting regulation.
What is the function of Pin 3 on LM4040DIM3-2.1?
Pin 3 on LM4040DIM3-2.1 is labeled N.C. (No Connection) and must be left electrically floating or connected directly to Pin 2 (anode). It has no internal connection to the die. Leaving Pin 3 unconnected or tying it to Pin 2 prevents parasitic coupling and ensures specified electrical performance. Connecting Pin 3 to any other net-especially to Pin 1 or a voltage rail-may cause regulation inaccuracy or instability, as confirmed in the official Maxim datasheet top-view diagram and pin description table.
How does temperature affect the output voltage of LM4040DIM3-2.1?
LM4040DIM3-2.1 exhibits a maximum temperature coefficient of ±150ppm/°C over -40°C to +85°C. At 2.048V output, this corresponds to a worst-case drift of ±9.75mV across the full temperature range. The actual polarity (positive or negative slope) varies unit-to-unit but is bounded by specification. For example, at +85°C, output may measure 2.05775V or 2.03825V depending on unit variation-both within datasheet limits. Designers should account for this drift in systems requiring <0.5% total error over temperature.
Is LM4040DIM3-2.1 compatible with SC70-3 footprint?
No, LM4040DIM3-2.1 uses the SOT23-3 package (2.92mm × 1.3mm), not SC70-3 (1.8mm × 1.8mm). The "M3" suffix explicitly denotes SOT23-3 packaging, while "X3" variants (e.g., LM4040DIX3-2.1) use SC70-3. These packages are mechanically incompatible-SOT23-3 has longer leads and different pad pitch. Attempting to mount LM4040DIM3-2.1 on an SC70-3 footprint will result in solder bridging or open connections. Always match the package code in the part number to the PCB land pattern.
LM4040DIM3-2.1 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 28µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040DIM3-2.1 FAQ
1.How can I place an order for LM4040DIM3-2.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DIM3-2.1 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 LM4040DIM3-2.1 reliable?
The price and inventory of LM4040DIM3-2.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DIM3-2.1 is usually 5 days.
3.What payment methods are accepted for LM4040DIM3-2.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DIM3-2.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DIM3-2.1?
LM4040DIM3-2.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DIM3-2.1 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 LM4040DIM3-2.1?
For technical support, including LM4040DIM3-2.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DIM3-2.1 requirements.
6.How does Aetrix verify that LM4040DIM3-2.1 is sourced from the original manufacturer or authorized distributors?
All LM4040DIM3-2.1 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 LM4040DIM3-2.1 meets industry standards.
7.What is the process for return or replacement of LM4040DIM3-2.1?
All LM4040DIM3-2.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DIM3-2.1, 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 LM4040DIM3-2.1 part is unused and in its original packaging.
Return procedure for LM4040DIM3-2.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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