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Analog Devices Inc./Maxim Integrated LM4040CIM3-2.5+T
- Part No.:
- LM4040CIM3-2.5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CIM3-2.5+T.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,081
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Product details
Overview
LM4040CIM3-2.5+T from Maxim Integrated is a precision 2.500V fixed-output, two-terminal shunt voltage reference in SC70-3 package, featuring ±0.5% initial accuracy, 100ppm/°C max temperature coefficient, and stable operation from 60μA to 15mA shunt current - used for ADC/DAC biasing, sensor excitation, and power supply monitoring in space-constrained portable electronics.
For engineers reviewing the LM4040CIM3-2.5+T datasheet, LM4040CIM3-2.5+T pinout, LM4040CIM3-2.5+T application, or LM4040CIM3-2.5+T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, no external capacitor requirement, low 35µVRMS noise (10Hz–10kHz), and compatibility with capacitive loads in battery-powered systems.
Technical Context
The LM4040CIM3-2.5+T implements a bandgap-based shunt reference architecture that maintains a precise 2.500V reverse breakdown voltage across its terminals when biased with 60μA–15mA cathode-to-anode current. It operates without external stabilization components and tolerates arbitrary output capacitance.
Its internal laser-trimmed resistor network ensures ±0.5% initial accuracy at +25°C, while thermal design guarantees ≤100ppm/°C drift over -40°C to +85°C. Dynamic impedance remains ≤0.9Ω at 1mA, enabling stable regulation under varying load and temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±12.5mV at +25°C - defines reference level for analog signal chains and data converters |
| Initial Accuracy | ±0.5% (±12.5mV) - enables high-resolution measurement without calibration |
| Tempco | ≤100ppm/°C - limits voltage drift to ±8.125mV over full -40°C to +85°C range |
| Shunt Current Range | 60μA to 15mA - supports ultra-low-power sensing and high-current regulation |
| Output Noise | 35µVRMS (10Hz–10kHz) - minimizes error in precision ADC references |
| Dynamic Impedance | ≤0.9Ω at 1mA - ensures minimal voltage shift during transient load changes |
| Long-Term Stability | 120ppm (1000h) - maintains accuracy over product lifetime without recalibration |
Pinout & Package
LM4040CIM3-2.5+T is housed in a RoHS-compliant 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is unconnected (N.C.) and must be left floating or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to system ground or low-impedance return path; forms cathode-to-anode bias path |
| 2 (–) | Cathode (negative terminal) | Reference output node; sinks shunt current to maintain 2.500V across terminals |
| 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; no internal function or electrical tie |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - saves PCB space in wearables and compact IoT sensors |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout constraints |
| Wide shunt current range | 60μA–15mA operation - supports both micropower sensor nodes and higher-current analog stages |
| Low wideband noise | 35µVRMS (10Hz–10kHz) - preserves SNR in 16-bit+ data acquisition systems |
| Guaranteed temp range | -40°C to +85°C operation - qualified for industrial and automotive cabin applications |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Reference for low-power analog front-end in wearable ECG or pulse oximeter modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.500V bias to op-amps and ADCs. Use Value: Enables <1µA standby current while maintaining ±0.5% reference accuracy across body-temperature variations. | Use Scenario: Precision reference for 24-bit sigma-delta ADC measuring environmental parameters over years of field deployment. IC Role / Device Role / Timing Role: Two-terminal shunt reference supplying excitation and conversion reference for resistive/humidity sensors. Use Value: 120ppm long-term stability and 100ppm/°C tempco ensure <0.1% total error accumulation over 5-year operation. |
| Industrial Process Transmitters | Automotive Cabin Control Units |
Use Scenario: Reference for 4–20mA loop-powered transmitter converting pressure/temperature signals. IC Role / Device Role / Timing Role: Shunt reference regulating loop current source and ADC reference simultaneously. Use Value: Stable 2.500V output over -40°C to +85°C allows single-component solution without trimming or compensation. | Use Scenario: Reference for HVAC sensor interface and infotainment system audio DACs in non-engine compartments. IC Role / Device Role / Timing Role: Fixed-voltage shunt reference powering analog signal conditioning circuits. Use Value: AEC-Q100-compatible variant availability and SC70 size support compact, thermally robust designs near displays or control panels. |
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 | Requires two external resistors for 2.5V setting; higher minimum cathode current (80μA) | Select when adjustable output or higher voltage capability is needed; verify resistor tolerance impact on accuracy |
| MAX6008AEUR+T | Fixed 2.5V output; 0.2% initial accuracy; 50ppm/°C tempco; SOT23-3; 35µVRMS noise | Higher accuracy and lower tempco but limited to 10mA max shunt current | Select when tighter initial tolerance and thermal stability are critical; confirm 10mA limit suffices for load regulation |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040CIM3-2.5+T offers optimal balance of fixed 2.5V precision, ultra-low quiescent current (60μA), and robust capacitive-load stability - making it ideal for cost-sensitive, space-constrained, and battery-operated systems where simplicity and reliability are prioritized over adjustability or sub-0.5% accuracy.
Availability
LM4040CIM3-2.5+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial process transmitters, and automotive cabin control units requiring stable component supply with consistent lead times and full traceability.
Supply support for LM4040CIM3-2.5+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, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, automotive, communications, and consumer applications.
The LM4040 product line delivers improved precision micropower shunt voltage references optimized for space-constrained, low-power systems requiring stable, fixed-output references without external compensation.
FAQ
What is the operating temperature range for LM4040CIM3-2.5+T?
The LM4040CIM3-2.5+T is specified for operation from -40°C to +85°C. This grade (denoted by "I" in the part number) is distinct from the extended-range "E" variants rated to +125°C. Its performance parameters-including initial accuracy, tempco, and dynamic impedance-are guaranteed across this full industrial temperature span.
Does LM4040CIM3-2.5+T require an external capacitor for stability?
No, the LM4040CIM3-2.5+T does not require an external output capacitor and remains stable with any capacitive load. This eliminates layout dependencies and BOM overhead. The device's internal design ensures phase margin is maintained regardless of output capacitance value, making it ideal for noisy or dynamically loaded environments.
What is the minimum shunt current needed for LM4040CIM3-2.5+T to regulate properly?
The LM4040CIM3-2.5+T requires a minimum shunt current of 60μA to maintain regulation. Below this threshold, the output voltage deviates from 2.500V. This value is guaranteed across the full -40°C to +85°C temperature range and applies to all C-grade (±0.5%) devices in SC70 and SOT23 packages.
How does the noise performance of LM4040CIM3-2.5+T compare to other shunt references?
The LM4040CIM3-2.5+T delivers 35µVRMS wideband noise (10Hz–10kHz), measured at 100μA shunt current. This is competitive with high-precision shunt references and significantly lower than standard Zener diodes. Its low-noise profile directly improves effective resolution in 16-bit and higher ADC applications without additional filtering.
Can LM4040CIM3-2.5+T be used in automotive applications?
The LM4040CIM3-2.5+T itself is rated for -40°C to +85°C and is not AEC-Q100 qualified. However, Maxim offers automotive-grade variants such as LM4040CEM3-2.5/V+T (with /V suffix) that meet AEC-Q100 Grade 2 requirements (-40°C to +105°C). For cabin or non-critical automotive use, the LM4040CIM3-2.5+T may be considered with appropriate system-level validation.
LM4040CIM3-2.5+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):
- 2.5V
- 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+T FAQ
1.How can I place an order for LM4040CIM3-2.5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIM3-2.5+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 LM4040CIM3-2.5+T reliable?
The price and inventory of LM4040CIM3-2.5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIM3-2.5+T is usually 5 days.
3.What payment methods are accepted for LM4040CIM3-2.5+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIM3-2.5+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIM3-2.5+T?
LM4040CIM3-2.5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIM3-2.5+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 LM4040CIM3-2.5+T?
For technical support, including LM4040CIM3-2.5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIM3-2.5+T requirements.
6.How does Aetrix verify that LM4040CIM3-2.5+T is sourced from the original manufacturer or authorized distributors?
All LM4040CIM3-2.5+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 LM4040CIM3-2.5+T meets industry standards.
7.What is the process for return or replacement of LM4040CIM3-2.5+T?
All LM4040CIM3-2.5+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIM3-2.5+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 LM4040CIM3-2.5+T part is unused and in its original packaging.
Return procedure for LM4040CIM3-2.5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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