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Analog Devices Inc./Maxim Integrated LM4040DIM3-2.1-T
- Part No.:
- LM4040DIM3-2.1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040DIM3-2.1-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
LM4040DIM3-2.1-T from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, featuring 1.0% initial accuracy, ±150ppm/°C temperature coefficient, and stable operation from 60μA to 15mA shunt current. It delivers low 28μVRMS noise (10Hz–10kHz) and supports space-constrained battery-powered systems requiring high-accuracy analog sensing or ADC reference.
For engineers reviewing the LM4040DIM3-2.1-T datasheet, LM4040DIM3-2.1-T pinout, LM4040DIM3-2.1-T application, or LM4040DIM3-2.1-T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, no external capacitor requirement, compatibility with capacitive loads, and direct integration into low-power voltage regulation or precision measurement circuits without layout redesign.
Technical Context
The LM4040DIM3-2.1-T uses bandgap-based shunt architecture to maintain a fixed 2.048V reverse breakdown voltage across its terminals when biased with 60μA–15mA cathode-to-anode current. Its laser-trimmed internal resistor ensures factory-set accuracy, while dynamic impedance of ≤1.1Ω at 1mA enables stable regulation under varying load conditions.
It operates without output capacitance stabilization and tolerates arbitrary capacitive loads-unlike series references-making it suitable for point-of-load reference in portable systems where board area and BOM count are critical. The device's maximum junction temperature is +150°C, with thermal derating applied above +70°C ambient in the SC70 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.048V nominal; ±20mV max tolerance over -40°C to +85°C (D-grade) |
| Initial Accuracy | ±1.0% at +25°C; translates to ±20.5mV absolute error at 2.048V |
| Tempco | ±150ppm/°C max; contributes ≤±12.3mV drift over full temperature range |
| Shunt Current Range | 60μA to 15mA; supports ultra-low-power standby and high-precision active modes |
| Dynamic Impedance | ≤1.1Ω at 1mA; ensures <11mV output shift for 10mA load transients |
| Output Noise | 28μVRMS (10Hz–10kHz); suitable for 12-bit+ SAR ADC reference applications |
| Long-Term Stability | 120ppm after 1000h; <0.012% drift over 1k-hour reliability test |
Pinout & Package
LM4040DIM3-2.1-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is NC (no connection) and must remain unconnected or tied to pin 2 per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to system ground or low-side reference node; forms cathode-to-anode bias path |
| 2 (–) | Cathode (negative terminal) | Connects to regulated voltage rail; sinks shunt current to maintain 2.048V across pins 1–2 |
| 3 (N.C.) | No connection | Must be left floating or shorted to pin 2; not internally bonded; avoids parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% PCB space vs. SOT23 alternatives |
| No output capacitor required | Eliminates external component and associated layout constraints for stability |
| Capacitive load tolerance | Stable with any output capacitance value-ideal for noisy supply environments |
| Wide shunt current range | 60μA minimum enables microamp-level power budgeting in sleep modes |
| Guaranteed industrial temp range | -40°C to +85°C operation validated across all electrical specs |
Applications
| Portable, Battery-Powered Equipment | Notebook Computers |
|---|---|
Use Scenario: Precision voltage reference for fuel gauge ICs and battery monitoring ADCs in handheld medical devices. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.048V reference to 12-bit delta-sigma ADC measuring cell voltage. Use Value: Enables ±0.5% state-of-charge accuracy over temperature and battery discharge cycle due to tight initial tolerance and low tempco. | Use Scenario: Reference source for system management controller (SMC) analog inputs monitoring CPU core voltage rails. IC Role / Device Role / Timing Role: Two-terminal shunt reference sinking current to hold 2.048V on feedback node of DC-DC converter monitor circuit. Use Value: Eliminates need for op-amp buffer or series reference, reducing component count and quiescent current in always-on subsystems. |
| Cell Phones | Industrial Process Controls |
Use Scenario: Reference for RF front-end power detector calibration during production test. IC Role / Device Role / Timing Role: Stable 2.048V reference used to calibrate logarithmic amplifier response in PA output power sensing path. Use Value: Maintains calibration integrity across -20°C to +60°C operating envelope with <±15mV total error including tempco and aging. | Use Scenario: Precision reference for 4–20mA loop transmitter DAC in field-mounted sensor modules. IC Role / Device Role / Timing Role: Shunt reference establishing accurate 2.048V full-scale for 16-bit DAC generating loop current command. Use Value: Achieves <0.1% total unadjusted error (TUE) over industrial temperature range without trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | 2.5V adjustable reference; requires external resistors; 1% accuracy; 90ppm/°C tempco | Not pin-compatible; needs design change for 2.048V output; higher quiescent current (80μA min) | Select if adjustable output or tighter tempco required; avoid if fixed 2.048V and minimal BOM are mandatory |
| MAX6002EUR+T | 2.048V fixed reference; 0.5% accuracy; 75ppm/°C tempco; SOT23-3 package | Same voltage but higher accuracy grade; different pinout (cathode/anode reversed vs. LM4040) | Choose for improved accuracy/stability; verify PCB layout compatibility due to reversed terminal assignment |
Compared with TLV431ACDBVR and MAX6002EUR+T, LM4040DIM3-2.1-T offers the smallest footprint and lowest component count for fixed 2.048V shunt reference, though with relaxed accuracy and higher tempco-making it optimal for cost-sensitive, space-constrained designs where ±1% tolerance is acceptable.
Availability
LM4040DIM3-2.1-T is available at Aetrix Electronics and suitable for portable electronics, notebook power management, and industrial sensor signal conditioning requiring stable component supply with consistent lead times and RoHS-compliant packaging.
Supply support for LM4040DIM3-2.1-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 is a semiconductor company specializing in analog and mixed-signal ICs for power, interface, sensing, and communication applications.
The LM4040 product line delivers micropower, precision shunt voltage references optimized for space-constrained, battery-operated systems requiring stable reference voltages without external components.
FAQ
What is the exact reference voltage and tolerance of LM4040DIM3-2.1-T?
The LM4040DIM3-2.1-T is a 2.048V fixed shunt reference with ±1.0% initial accuracy at +25°C, translating to a guaranteed 2.028V to 2.068V range. Over the full -40°C to +85°C temperature range, its total tolerance expands to ±1.98% (±40.6mV) due to ±150ppm/°C tempco and initial error accumulation.
Does LM4040DIM3-2.1-T require an external capacitor for stability?
No, LM4040DIM3-2.1-T does not require an external output capacitor and remains stable with any capacitive load-including large bulk capacitors or long PCB traces. This eliminates BOM cost and layout complexity common with series references, making LM4040DIM3-2.1-T ideal for compact, low-component-count designs.
What is the minimum operating current for LM4040DIM3-2.1-T?
The LM4040DIM3-2.1-T requires a minimum shunt current of 65μA to maintain regulation within specification. Below this threshold, output voltage may deviate beyond the guaranteed tolerance band. Designers must ensure the source resistor and load conditions sustain ≥65μA across all operating temperatures and supply variations.
How does the SC70-3 package of LM4040DIM3-2.1-T compare to SOT23 versions?
The LM4040DIM3-2.1-T uses the SC70-3 package (1.8mm × 1.8mm), which is 50% smaller than the standard SOT23-3 (2.9mm × 1.6mm). While both share identical pinout and electrical specs, the SC70 variant reduces PCB area significantly-critical for ultra-portable devices-but has lower power dissipation limits (174mW vs. 320mW at +70°C).
Can LM4040DIM3-2.1-T be used in automotive applications?
The LM4040DIM3-2.1-T is rated for -40°C to +85°C operation and is not qualified for automotive AEC-Q200 stress testing. For automotive use, consider the LM4040BEX3-2.1-T or LM4040CEX3-2.1-T variants, which are specified over -40°C to +125°C and offered in the same SC70-3 package with tighter accuracy and tempco grades.
LM4040DIM3-2.1-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:
- ±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-T FAQ
1.How can I place an order for LM4040DIM3-2.1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DIM3-2.1-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 LM4040DIM3-2.1-T reliable?
The price and inventory of LM4040DIM3-2.1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DIM3-2.1-T is usually 5 days.
3.What payment methods are accepted for LM4040DIM3-2.1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DIM3-2.1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DIM3-2.1-T?
LM4040DIM3-2.1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DIM3-2.1-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 LM4040DIM3-2.1-T?
For technical support, including LM4040DIM3-2.1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DIM3-2.1-T requirements.
6.How does Aetrix verify that LM4040DIM3-2.1-T is sourced from the original manufacturer or authorized distributors?
All LM4040DIM3-2.1-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 LM4040DIM3-2.1-T meets industry standards.
7.What is the process for return or replacement of LM4040DIM3-2.1-T?
All LM4040DIM3-2.1-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DIM3-2.1-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 LM4040DIM3-2.1-T part is unused and in its original packaging.
Return procedure for LM4040DIM3-2.1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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