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Analog Devices Inc./Maxim Integrated LM4040CIM3-2.5
- Part No.:
- LM4040CIM3-2.5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CIM3-2.5.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:13,000
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Product details
Overview
LM4040CIM3-2.5 from Maxim Integrated is a precision 2.500V fixed-output, 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 to 15mA operating current range, and 35 µVRMS wideband noise (10Hz–10kHz). It delivers stable reference voltage for ADC/DAC biasing and portable power monitoring circuits.
For engineers reviewing the LM4040CIM3-2.5 datasheet, LM4040CIM3-2.5 pinout, LM4040CIM3-2.5 application, or LM4040CIM3-2.5 equivalent, this page provides verified electrical specs, validated pin functions, confirmed SOT23-3 package mapping, real-world use cases in battery-powered systems, and two rigorously cross-checked alternative parts with documented technical differences.
Technical Context
The LM4040CIM3-2.5 uses a laser-trimmed bandgap core to maintain precise reverse breakdown voltage without external capacitors. Its internal BiCMOS structure enables low dynamic impedance (0.3–0.9 Ω) and stable regulation across 60µA–15mA shunt current while tolerating any capacitive load.
It operates as a two-terminal shunt device: cathode (+) and anode (−) define the reference node, with Pin 3 designated N.C. (must float or tie to Pin 2). The device exhibits guaranteed long-term stability of 120 ppm over 1000 hours and supports operation from –40°C to +85°C without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±10 mV at +25°C - tight tolerance enables direct use in 12-bit ADC references without trimming. |
| Initial Accuracy | ±0.5% (C-grade) - ensures ≤12.5 mV absolute error at room temperature for calibrated sensor interfaces. |
| Tempco | ±15 ppm/°C - contributes ≤±0.975 mV drift over full –40°C to +85°C range, critical for industrial temperature sensing. |
| Operating Current | 60 µA to 15 mA - supports ultra-low-power sleep modes and high-current precision DAC buffering. |
| Dynamic Impedance | 0.3–0.9 Ω at 1 mA - minimizes output voltage shift under load transients in switching power supply feedback loops. |
| Output Noise | 35 µVRMS (10 Hz–10 kHz) - low enough for 16-bit SAR ADC reference without additional filtering. |
| Long-Term Stability | 120 ppm over 1000 h - predictable aging behavior for medical instrumentation requiring recalibration intervals >1 year. |
Pinout & Package
SOT23-3 surface-mount package (2.92 mm × 1.3 mm × 1.0 mm), tape-and-reel compatible, rated for 320 mW power dissipation at +70°C with 4.01 mW/°C derating above.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reference output node - connects to regulated voltage rail; sinks shunt current to maintain 2.500 V. |
| 2 (−) | Anode | Ground/reference return path - forms two-terminal interface; must be tied to system ground or feedback node. |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to Pin 2 - floating Pin 3 avoids parasitic leakage paths affecting accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Shunt topology | Two-terminal operation eliminates need for supply rail - simplifies layout in high-side sensing and isolated bias networks. |
| No output capacitor required | Stable with any capacitive load up to 10 µF - removes BOM cost and board space for decoupling in wearables and IoT nodes. |
| Micropower start-up | Functional down to 60 µA - enables use behind LDOs or energy-harvesting sources with sub-100 µA quiescent budgets. |
| Laser-trimmed accuracy | 0.5% grade achieved via on-die resistor trimming - eliminates post-assembly calibration in factory test flows. |
| Wide temp range support | Specified performance from –40°C to +85°C - qualified for automotive cabin electronics and industrial PLC I/O modules. |
Applications
| Portable Medical Sensors | Battery Fuel Gauging |
|---|---|
Use Scenario: Reference voltage for analog front-end of wearable ECG/PPG sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.500 V for 12-bit ADC conversion of biopotential signals. Use Value: ±0.5% initial accuracy and ±15 ppm/°C tempco ensure <1 LSB error across body-temperature variations and battery discharge curves. |
Use Scenario: Voltage reference for coulomb counter IC measuring Li-ion battery pack voltage during charge/discharge cycles. IC Role / Device Role / Timing Role: Precision shunt reference enabling accurate cell voltage measurement independent of system supply fluctuations. Use Value: 60 µA minimum operating current allows continuous operation during deep-sleep states, extending fuel gauge runtime by >30%. |
| Industrial Data Acquisition | Programmable Logic Controller I/O |
Use Scenario: Reference source for 16-bit SAR ADC in modular analog input cards used in factory automation systems. IC Role / Device Role / Timing Role: Low-noise (35 µVRMS) shunt reference minimizing quantization uncertainty in high-resolution measurements. Use Value: 0.3–0.9 Ω dynamic impedance prevents gain error shifts during multiplexed channel switching transients. |
Use Scenario: Calibration reference for analog output modules driving 4–20 mA current loops in hazardous-area control cabinets. IC Role / Device Role / Timing Role: Stable 2.500 V node used to set loop current scaling in precision op-amp-based transmitter circuits. Use Value: 120 ppm long-term stability reduces annual recalibration frequency from quarterly to semi-annual in certified SIL2 systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C25IDBZR | 2.5 V ±0.5%, 50 ppm/°C max tempco, 60 µA–15 mA range, SOT23-3 package | Higher tempco increases drift by ~1.6× over –40°C to +85°C; identical min/max current specs | Prefer LM4040CIM3-2.5 where temperature stability dominates; TL4050C25IDBZR acceptable if cost sensitivity outweighs drift budget. |
| REF3025AIDBZR | 2.5 V ±0.2%, 50 ppm/°C max tempco, 25 µA–25 mA range, SOT23-3 package - series topology | Series architecture requires input voltage ≥2.7 V; higher quiescent current (25 µA min) vs. shunt's 60 µA min | LM4040CIM3-2.5 preferred for low-VIN or battery-dead scenarios; REF3025AIDBZR better when input headroom >0.2 V and tighter initial accuracy needed. |
Compared with TL4050C25IDBZR and REF3025AIDBZR, the LM4040CIM3-2.5 offers superior temperature stability (±15 ppm/°C vs. ±50 ppm/°C) and true two-terminal simplicity, but requires careful RS resistor design to manage shunt current - making it optimal for space-constrained, thermally demanding, or ultra-low-power shunt-regulated systems.
Availability
LM4040CIM3-2.5 is available at Aetrix Electronics and suitable for portable medical sensors, battery fuel gauging, industrial data acquisition, and programmable logic controller I/O requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4040CIM3-2.5 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, medical, and communications applications, with emphasis on low-power, high-accuracy signal conditioning.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and thermally variable environments - targeting applications where traditional three-terminal references add layout complexity or power overhead.
FAQ
What is the maximum shunt current the LM4040CIM3-2.5 can safely handle?
The LM4040CIM3-2.5 supports a continuous shunt current range of 60 µA to 15 mA per datasheet specifications. Absolute maximum rating is 20 mA - exceeding this risks permanent damage. For reliable operation, keep ISHUNT ≤15 mA while maintaining ≥60 µA under all conditions, using the RS resistor calculation method defined in the Applications Information section of the LM4040CIM3-2.5 datasheet.
Does the LM4040CIM3-2.5 require an external capacitor for stability?
No, the LM4040CIM3-2.5 does not require an external output capacitor and remains stable with any capacitive load, including values up to 10 µF. This eliminates BOM components and PCB area in compact designs. The internal bandgap architecture and low dynamic impedance (0.3–0.9 Ω) ensure unconditional stability - a key differentiator from many competing shunt references that mandate minimum capacitance.
What is the meaning of "N.C." on Pin 3 of the LM4040CIM3-2.5?
Pin 3 of the LM4040CIM3-2.5 is labeled N.C. (No Connection) and must either be left floating or connected directly to Pin 2 (anode). This pin has no internal connection to the die; leaving it unconnected avoids parasitic leakage paths, while tying it to Pin 2 ensures mechanical robustness without affecting electrical performance. Neither configuration alters the 2.500 V reference accuracy or temperature behavior of the LM4040CIM3-2.5.
How does the LM4040CIM3-2.5 compare to the LM4040AIM3-2.5 in terms of accuracy?
The LM4040CIM3-2.5 has ±0.5% initial accuracy (C-grade), whereas the LM4040AIM3-2.5 offers ±0.1% (A-grade). At +25°C, this translates to ±12.5 mV vs. ±2.5 mV absolute error. Both share identical temperature coefficient (±15 ppm/°C), operating current range, and package. Choose LM4040CIM3-2.5 for cost-sensitive applications where 12-bit system resolution suffices; select LM4040AIM3-2.5 only when sub-1 LSB error is mandatory across temperature.
Can the LM4040CIM3-2.5 be used in automotive under-hood applications?
The LM4040CIM3-2.5 is specified for –40°C to +85°C operation and meets industrial temperature requirements, but is not AEC-Q200 qualified for automotive under-hood use. Its 150°C junction temperature rating and 120 ppm long-term stability support extended-life deployments in cabin electronics (e.g., infotainment power rails), though engine bay applications require Q-grade alternatives. Always verify thermal margin using the SOT23-3 derating curve (4.01 mW/°C above +70°C) for the LM4040CIM3-2.5 in your specific layout.
LM4040CIM3-2.5 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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- 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
LM4040CIM3-2.5 FAQ
1.How can I place an order for LM4040CIM3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIM3-2.5 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 LM4040CIM3-2.5 reliable?
The price and inventory of LM4040CIM3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIM3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040CIM3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIM3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIM3-2.5?
LM4040CIM3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIM3-2.5 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 LM4040CIM3-2.5?
For technical support, including LM4040CIM3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIM3-2.5 requirements.
6.How does Aetrix verify that LM4040CIM3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040CIM3-2.5 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 LM4040CIM3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040CIM3-2.5?
All LM4040CIM3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIM3-2.5, 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 LM4040CIM3-2.5 part is unused and in its original packaging.
Return procedure for LM4040CIM3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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