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Analog Devices Inc./Maxim Integrated LM4040CIM3-2.1+T
- Part No.:
- LM4040CIM3-2.1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CIM3-2.1+T.pdf
- Description:
- IC VREF SHUNT 2.048V SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,337
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Product details
Overview
LM4040CIM3-2.1+T from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.5% initial accuracy, 100ppm/°C max temperature coefficient, 60μA–15mA operating current range, and guaranteed operation from –40°C to +85°C. It serves as a stable bandgap reference in portable battery-powered systems where space and low quiescent current are critical.
For engineers reviewing the LM4040CIM3-2.1+T datasheet, LM4040CIM3-2.1+T pinout, LM4040CIM3-2.1+T application, or LM4040CIM3-2.1+T equivalent, key selection criteria include reverse breakdown voltage tolerance over temperature, dynamic impedance at 1mA, wideband noise (28µVRMS), minimum operating current (65µA), and compatibility with capacitive loads without external stabilization.
Technical Context
The LM4040CIM3-2.1+T implements a laser-trimmed bandgap core to deliver precise 2.048V reverse breakdown voltage with tight initial tolerance and predictable thermal drift. Its two-terminal architecture eliminates need for external biasing components or output capacitors.
It operates as a passive shunt device: reverse current (cathode-to-anode) between 60μA and 15mA establishes regulation, while forward current capability up to 10mA supports bidirectional testing. The NC pin (Pin 3) must be left unconnected or tied to cathode (Pin 2) per datasheet specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±10mV (±0.5%) initial tolerance at +25°C ensures accurate ADC/DAC reference calibration. |
| Tempco | ≤100ppm/°C over –40°C to +85°C; enables <±2.5mV total drift across full industrial range. |
| Operating Current | 60μA to 15mA shunt range; supports ultra-low-power sensor nodes and high-current analog front-ends. |
| Dynamic Impedance | ≤0.9Ω at 1mA/120Hz; maintains voltage stability under fast load transients. |
| Wideband Noise | 28µVRMS (10Hz–10kHz); suitable for high-resolution 16-bit+ data acquisition systems. |
| Long-Term Stability | 120ppm after 1000h; ensures reference integrity in mission-critical embedded control. |
Pinout & Package
LM4040CIM3-2.1+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. RoHS-compliant, tape-and-reel packaged.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-biased terminal; connects to regulated voltage node and current-limiting resistor. |
| 2 (–) | Anode | Reference ground return; forms shunt path with Pin 1 to sink excess current. |
| 3 (N.C.) | No Connection | Must remain unconnected or tied to Pin 2; floating connection risks parametric shift or instability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | Enables placement in space-constrained wearables and IoT edge nodes without sacrificing accuracy. |
| No output capacitor required | Eliminates BOM cost and layout area for stability compensation; simplifies design validation. |
| Capacitive load tolerance | Stable with any output capacitance - supports direct connection to ADC input caps or long PCB traces. |
| Low 28µVRMS noise | Minimizes quantization error in precision measurement systems using 16-bit or higher resolution converters. |
| Laser-trimmed resistors | Guarantees ±0.5% initial accuracy without post-manufacturing calibration steps. |
Applications
| Portable Medical Sensors | Notebook Power Management |
|---|---|
Use Scenario: Battery-powered glucose meter requiring stable 2.048V reference for 16-bit ADC conversion of electrochemical signal. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precision VREF to SAR ADC, replacing larger three-terminal references. Use Value: SC70-3 size reduces PCB area by >50% vs. SOT23; 60μA min current enables >7-day battery life in sleep mode. | Use Scenario: Voltage margining circuit for CPU core rail, where programmable DAC sets target voltage and LM4040CIM3-2.1+T provides feedback reference. IC Role / Device Role / Timing Role: Stable 2.048V reference for closed-loop voltage regulation feedback path. Use Value: 100ppm/°C tempco ensures <±1.5mV drift over notebook ambient range (0–70°C), maintaining ±0.5% rail accuracy. |
| Automotive Cabin Control | Industrial Process Transmitter |
Use Scenario: HVAC control module measuring thermistor resistance via ratiometric ADC, needing stable excitation reference. IC Role / Device Role / Timing Role: Shunt reference supplying known voltage to thermistor divider network feeding microcontroller ADC. Use Value: Guaranteed operation to +85°C meets automotive cabin ambient spec; ±0.5% accuracy enables <0.2°C temperature resolution. | Use Scenario: 4–20mA loop-powered pressure transmitter with onboard microcontroller and precision analog front-end. IC Role / Device Role / Timing Role: Primary voltage reference for signal conditioning and ADC conversion in isolated 2-wire loop design. Use Value: 15mA max shunt current allows integration into loop-powered architecture without exceeding 20mA compliance limit. |
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; 100ppm/°C tempco; SOT23-3 package. | Requires two external resistors to set 2.048V; higher minimum cathode current (80µA). | Select when adjustable output or higher voltage options are needed; verify resistor tolerance impact on final accuracy. |
| MAX6008AEUR+T | Fixed 2.048V; 0.2% initial accuracy; 50ppm/°C tempco; SOT23-3 package; higher cost. | Superior accuracy and tempco, but no SC70 option; requires same PCB footprint change as LM4040CIM3-2.1+T. | Choose for metrology-grade systems where ±0.2% and 50ppm/°C justify premium pricing and SOT23 layout. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040CIM3-2.1+T offers optimal balance of SC70 size, 0.5% accuracy, and proven stability in battery-constrained designs-without external components or footprint penalty.
Availability
LM4040CIM3-2.1+T is available at Aetrix Electronics and suitable for portable medical sensors, notebook power management, automotive cabin control, and industrial process transmitters requiring stable component supply and long-term production continuity.
Supply support for LM4040CIM3-2.1+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 designs precision analog and mixed-signal ICs for industrial, automotive, and computing applications, emphasizing high accuracy, low power, and small form factor.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems demanding stable 2.048V–5.000V references without external capacitors.
FAQ
What is the exact reverse breakdown voltage of LM4040CIM3-2.1+T at +25°C?
The LM4040CIM3-2.1+T has a nominal reverse breakdown voltage of 2.048V at +25°C, with a guaranteed range of 2.038V to 2.058V (±10mV, or ±0.5%) per its C-grade specification. This value is laser-trimmed and tested during production.
Can LM4040CIM3-2.1+T operate without an external capacitor?
Yes, the LM4040CIM3-2.1+T is internally compensated and does not require an external output capacitor for stability. It remains stable with any capacitive load, including direct connection to ADC input capacitors or long PCB traces - a key advantage over many three-terminal references.
What is the minimum operating current for LM4040CIM3-2.1+T?
The LM4040CIM3-2.1+T requires a minimum shunt current of 65µA (typical) to maintain regulation, with a guaranteed maximum of 65µA across –40°C to +85°C. Below this threshold, the device exits regulation and output voltage drops nonlinearly.
Is Pin 3 of LM4040CIM3-2.1+T functional or optional?
Pin 3 of the LM4040CIM3-2.1+T is explicitly designated N.C. (No Connection) in the datasheet. It must either remain unconnected or be tied directly to Pin 2 (anode). Leaving it floating may cause parametric variation or instability due to parasitic coupling.
Does LM4040CIM3-2.1+T support automotive temperature range?
No - the LM4040CIM3-2.1+T is rated for –40°C to +85°C (I-grade). For automotive applications requiring –40°C to +125°C, select the LM4040CEX3-2.1+T (SC70) or LM4040CEM3-2.1+T (SOT23), both qualified to the extended temperature range and AEC-Q100 Level 2.
LM4040CIM3-2.1+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:
- ±0.5%
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CIM3-2.1+T FAQ
1.How can I place an order for LM4040CIM3-2.1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIM3-2.1+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 LM4040CIM3-2.1+T reliable?
The price and inventory of LM4040CIM3-2.1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIM3-2.1+T is usually 5 days.
3.What payment methods are accepted for LM4040CIM3-2.1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIM3-2.1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIM3-2.1+T?
LM4040CIM3-2.1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIM3-2.1+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 LM4040CIM3-2.1+T?
For technical support, including LM4040CIM3-2.1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIM3-2.1+T requirements.
6.How does Aetrix verify that LM4040CIM3-2.1+T is sourced from the original manufacturer or authorized distributors?
All LM4040CIM3-2.1+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 LM4040CIM3-2.1+T meets industry standards.
7.What is the process for return or replacement of LM4040CIM3-2.1+T?
All LM4040CIM3-2.1+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIM3-2.1+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 LM4040CIM3-2.1+T part is unused and in its original packaging.
Return procedure for LM4040CIM3-2.1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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