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Analog Devices Inc./Maxim Integrated LM4040CIM3-2.1
- Part No.:
- LM4040CIM3-2.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CIM3-2.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,385
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Product details
Overview
LM4040CIM3-2.1 from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SOT23-3 package, featuring 0.5% initial accuracy, ±15 ppm/°C temperature coefficient over –40°C to +85°C, 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 space and low quiescent current.
For engineers reviewing the LM4040CIM3-2.1 datasheet, LM4040CIM3-2.1 pinout, LM4040CIM3-2.1 application, or LM4040CIM3-2.1 equivalent, key selection criteria include guaranteed 2.048V output tolerance (±10 mV at +25°C), no external capacitor requirement, SC70/SOT23 package compatibility, and micropower operation down to 60µA shunt current.
Technical Context
The LM4040CIM3-2.1 uses a bandgap-based shunt architecture to maintain a precise reverse breakdown voltage without series pass elements. Its internal BiCMOS process enables stable regulation across 60µA–15mA shunt current while maintaining low dynamic impedance (≤0.9Ω at 1mA) and minimal voltage drift.
It operates as a two-terminal device with no ground reference required, sinking only the current needed to hold 2.048V across its terminals. Pin 3 is unconnected (N.C.) and must be left floating or tied to Pin 2 per datasheet guidance-this configuration ensures proper biasing and avoids parasitic leakage paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±10 mV max tolerance at +25°C (C-grade) |
| Initial Accuracy | 0.5% over –40°C to +85°C; supports mid-tier precision applications without calibration |
| Temp. Coefficient | ±15 ppm/°C max; ensures ≤±1.15% total error over full temperature range |
| Shunt Current Range | 60µA to 15mA; enables use with high-impedance sources and heavy loads alike |
| Dynamic Impedance | ≤0.9Ω at 1mA; minimizes output voltage shift under load transients |
| Output Noise | 28µVRMS (10Hz–10kHz); suitable for ADC reference and low-noise analog circuits |
| Long-Term Stability | 120ppm over 1000 hours; predictable aging behavior for mission-critical designs |
Pinout & Package
LM4040CIM3-2.1 is housed in a 3-pin SOT23-3 surface-mount package (2.92mm × 1.3mm × 1.0mm), optimized for space-constrained PCB layouts. The package is RoHS-compliant and rated for reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Terminal | Connects to system ground or low-side reference node; carries forward current up to 10mA |
| 2 (−) | Cathode / Negative Terminal | Reverse-biased terminal where 2.048V appears; sinks shunt current (60µA–15mA) to regulate voltage |
| 3 (N.C.) | No Connection | Must remain unconnected or tied to Pin 2; not internally bonded-floating connection prevents leakage or instability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT23-3 footprint | Enables placement in <1.5mm² area-ideal for wearables and compact IoT sensors |
| No output capacitor required | Stable with any capacitive load (0–∞), eliminating BOM cost and layout constraints |
| Wide shunt current range | Operates reliably from micropower (60µA) to moderate load (15mA), simplifying bias network design |
| Laser-trimmed bandgap core | Delivers factory-calibrated 2.048V output without post-assembly trimming or calibration |
| Low 28µVRMS noise | Supports 12-bit+ SAR ADCs and precision instrumentation amplifiers without additional filtering |
Applications
| Portable Medical Sensors | Battery Fuel Gauging |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) using low-power microcontroller and 12-bit ADC to digitize analog sensor output. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.048V reference for ADC conversion of electrochemical signal. Use Value: Enables accurate sub-1% measurement resolution over battery discharge cycle and –20°C to +50°C ambient range. | Use Scenario: Smart battery pack with integrated fuel gauge IC monitoring cell voltage during charge/discharge cycles. IC Role / Device Role / Timing Role: Precision reference for coulomb counter's analog front-end, ensuring consistent voltage scaling across varying supply conditions. Use Value: Maintains ±0.5% voltage reference accuracy despite 3.0V–4.2V battery input swing and 100µA–10mA load current changes. |
| Industrial Data Acquisition Modules | Wireless Sensor Node Power Management |
Use Scenario: 4–20mA loop-powered transmitter converting RTD or thermocouple signals to digital output. IC Role / Device Role / Timing Role: Stable shunt reference for excitation current source and ADC reference in isolated analog signal chain. Use Value: Guarantees <±0.1% gain error contribution over –40°C to +85°C industrial temperature range. | Use Scenario: Sub-GHz LoRaWAN sensor node powered by coin cell, waking periodically to sample environmental data. IC Role / Device Role / Timing Role: Micropower voltage reference enabling ultra-low standby current (<1µA typical) while retaining fast wake-up stability. Use Value: Achieves <20µs startup time to full accuracy and sustains regulation at 60µA minimum shunt current. |
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% accuracy, ±50ppm/°C tempco, SOT23-3, 60µA–15mA range | Higher tempco increases worst-case error by ~0.3% over –40°C to +85°C vs. LM4040CIM3-2.1 | Preferred when TI ecosystem alignment or alternate qualification is required; verify long-term stability (150ppm/1kHr) against design lifetime |
| ADR3420ARJZ-R7 | 2.048V, 0.1% accuracy, ±10ppm/°C, SOT23-5, 100µA–10mA range, requires external bypass cap | Higher accuracy but 2-pin shunt simplicity lost; 5-pin package occupies more area and needs decoupling | Choose when 0.1% absolute accuracy is mandatory and board space allows SOT23-5; avoid if micropower <100µA operation is critical |
Compared with TL4050C21IDBZR and ADR3420ARJZ-R7, LM4040CIM3-2.1 delivers optimal balance of accuracy (0.5%), thermal stability (±15ppm/°C), and true two-terminal simplicity-enabling direct replacement in space- and current-constrained shunt reference designs without layout or bill-of-material changes.
Availability
LM4040CIM3-2.1 is available at Aetrix Electronics and suitable for portable medical sensors, battery fuel gauging, industrial data acquisition modules, and wireless sensor node power management requiring stable component supply across extended production lifecycles.
Supply support for LM4040CIM3-2.1 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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The LM4040 product line delivers improved micropower shunt voltage references with multiple fixed outputs, targeting space- and current-sensitive systems where traditional three-terminal references add complexity or size.
FAQ
What is the maximum shunt current the LM4040CIM3-2.1 can safely handle?
The LM4040CIM3-2.1 has an absolute maximum reverse current rating of 20mA. For reliable long-term operation within specifications, the recommended operating range is 60µA to 15mA. Exceeding 15mA may increase self-heating and degrade accuracy, while sustained operation above 20mA risks permanent damage. Always verify power dissipation (P = VR × IR) remains below 174mW at ambient temperatures above +70°C.
Can the LM4040CIM3-2.1 be used without an external capacitor?
Yes-the LM4040CIM3-2.1 is internally compensated and does not require an external output capacitor for stability. It remains stable with any capacitive load, including 0pF up to several µF. This eliminates capacitor-related BOM cost, footprint, and reliability concerns. However, adding a small ceramic capacitor (e.g., 100nF) near the device may further reduce high-frequency noise in sensitive analog circuits.
What does the "C" grade signify in LM4040CIM3-2.1?
The "C" in LM4040CIM3-2.1 denotes the initial accuracy grade: ±0.5% over –40°C to +85°C. At +25°C, this corresponds to a 2.048V output tolerance of ±10 mV (2.038V to 2.058V). This grade balances cost and performance for mid-precision applications such as portable instrumentation and industrial control, where tighter tolerances (e.g., "A" grade ±0.1%) are unnecessary.
Is Pin 3 of the LM4040CIM3-2.1 functional or optional?
Pin 3 of the LM4040CIM3-2.1 is explicitly designated N.C. (No Connection) and is not functional. Per the datasheet, it must be left floating or connected directly to Pin 2 (cathode). This pin is not internally bonded and serves no electrical purpose-connecting it elsewhere may introduce leakage paths or instability. PCB layout should treat it as an unused pad with no trace routing.
How does the LM4040CIM3-2.1 compare to the LM4040CIX3-2.1?
The LM4040CIM3-2.1 uses a SOT23-3 package (2.92mm × 1.3mm), while LM4040CIX3-2.1 uses the smaller SC70-3 (1.8mm × 1.8mm). Both share identical electrical specs: 2.048V output, 0.5% accuracy, ±15ppm/°C tempco, and 60µA–15mA operation. The choice depends on board space constraints-SC70 saves ~50% area but requires tighter assembly tolerances; SOT23 offers broader manufacturability and thermal margin.
LM4040CIM3-2.1 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:
- ±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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CIM3-2.1 FAQ
1.How can I place an order for LM4040CIM3-2.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIM3-2.1 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 LM4040CIM3-2.1 reliable?
The price and inventory of LM4040CIM3-2.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIM3-2.1 is usually 5 days.
3.What payment methods are accepted for LM4040CIM3-2.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIM3-2.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIM3-2.1?
LM4040CIM3-2.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIM3-2.1 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 LM4040CIM3-2.1?
For technical support, including LM4040CIM3-2.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIM3-2.1 requirements.
6.How does Aetrix verify that LM4040CIM3-2.1 is sourced from the original manufacturer or authorized distributors?
All LM4040CIM3-2.1 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 LM4040CIM3-2.1 meets industry standards.
7.What is the process for return or replacement of LM4040CIM3-2.1?
All LM4040CIM3-2.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIM3-2.1, 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 LM4040CIM3-2.1 part is unused and in its original packaging.
Return procedure for LM4040CIM3-2.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIM3-2.1 Tags
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