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Texas Instruments LM4040CIM3-2.5
- Part No.:
- LM4040CIM3-2.5
- Manufacturer:
- Texas Instruments
- 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:2,555
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Product details
Overview
LM4040CIM3-2.5 from Texas Instruments is a precision micropower shunt voltage reference with 2.5 V nominal reverse breakdown voltage, ±0.5% initial tolerance at 25°C, 100 ppm/°C max temperature coefficient, 60 μA to 15 mA operating current range, and SOT-23-3 package-used for ADC/DAC biasing and sensor excitation in portable instrumentation.
For engineers reviewing the LM4040CIM3-2.5 datasheet, LM4040CIM3-2.5 pinout, LM4040CIM3-2.5 application, or LM4040CIM3-2.5 equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-temperature operation (−40°C to +85°C), and real-world substitution guidance for space-constrained, low-power analog systems.
Technical Context
The LM4040CIM3-2.5 operates as a two-terminal shunt reference: cathode accepts input current while anode is grounded, establishing a stable 2.5 V output across its terminals. Its bandgap-derived Zener-zap trimmed structure ensures monotonic temperature behavior and low dynamic impedance (≤0.9 Ω at 1 mA).
No external capacitor is required for stability, and it tolerates capacitive loads up to 10 nF-enabling direct use with SAR ADC reference inputs and op-amp feedback networks without phase-margin compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage, calibrated at 100 μA test current |
| Initial Tolerance | ±0.5% at 25°C (C-grade), enabling 12-bit system accuracy without trimming |
| Temp Coefficient | ≤100 ppm/°C over −40°C to +85°C, limiting drift to ±16.25 mV across full range |
| Operating Current | 60 μA minimum to 15 mA maximum-supports ultra-low-power sleep modes and high-current buffer stages |
| Output Noise | 35 μVRMS (10 Hz–10 kHz), suitable for 16-bit data acquisition without added filtering |
| Dynamic Impedance | ≤0.9 Ω at 1 mA, ensuring <1 mV load regulation error under 1 mA step changes |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, 0.95 mm height, gull-wing leads, JEDEC MO-178 compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / output voltage node | Connects to supply rail via series resistor; voltage develops across this terminal relative to anode |
| Anode (Pin 2) | Reference ground return | Must be connected to system ground; defines 0 V reference point for 2.5 V output |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to anode per TI specification |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into compact PCB layouts without stability-compensation components |
| Tolerates capacitive loads | Stable with up to 10 nF load capacitance-ideal for driving ADC reference inputs and op-amp buffers |
| Micropower operation | 60 μA minimum current allows battery life extension in always-on sensor nodes |
| Low thermal hysteresis | 0.08% voltage shift after −40°C ↔ 125°C cycling-critical for repeatable calibration in field instruments |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure over months on coin-cell power. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V excitation for bridge sensors and reference for 16-bit sigma-delta ADC. Use Value: 60 μA min operating current extends battery life; ±0.5% initial tolerance eliminates factory calibration steps. |
Use Scenario: 4–20 mA loop-powered transmitters converting RTD or thermocouple signals in process plants. IC Role / Device Role / Timing Role: Precision voltage reference for analog front-end gain/offset adjustment and ADC reference in isolated signal chains. Use Value: 100 ppm/°C tempco ensures ≤±0.1% span error over −40°C to +85°C ambient; SOT-23 footprint saves board space in tight enclosures. |
| Medical Point-of-Care Devices | Energy Meter Reference Subsystem |
Use Scenario: Handheld blood glucose meters requiring clinical-grade accuracy and low standby power. IC Role / Device Role / Timing Role: Stable 2.5 V reference for photodiode transimpedance amplifier and successive-approximation ADC. Use Value: 35 μVRMS broadband noise avoids signal averaging overhead; no capacitor needed simplifies FDA-compliant layout review. |
Use Scenario: DIN-rail mounted kWh meters needing metrology-grade voltage reference for polyphase energy measurement ICs. IC Role / Device Role / Timing Role: Primary shunt reference feeding multiple 24-bit delta-sigma ADCs and anti-aliasing filters. Use Value: Low dynamic impedance (<0.9 Ω) maintains reference integrity under varying load currents from digital isolators and communication ICs. |
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%, SOT-23-3, but uses buried Zener topology with higher 1/f noise and 120 ppm/°C max tempco | Less suitable for low-noise 16-bit data acquisition; better for cost-sensitive industrial controls | Select TL4050C25IDBZR only if long-term stability > low noise is primary requirement |
| REF3025AIDBZR | 2.5 V, ±0.2%, SC70-3, series topology with 50 μA quiescent current-but requires output capacitor and cannot sink current | Not a drop-in replacement: needs redesign for series-reference biasing and decoupling | Choose REF3025AIDBZR only when higher initial accuracy justifies added BOM and layout complexity |
Compared with TL4050C25IDBZR and REF3025AIDBZR, the LM4040CIM3-2.5 uniquely combines shunt topology simplicity, capacitor-free stability, and balanced noise/tempco performance-making it optimal for space- and power-constrained analog signal chains where direct cathode-to-rail connection is preferred.
Availability
LM4040CIM3-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, medical diagnostics, energy metering, and precision data acquisition requiring stable component supply across extended product lifecycles.
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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in precision analog ICs.
The LM4040-N family was designed for space-constrained, low-power applications demanding stable voltage references-especially in battery-operated instrumentation, sensor interfaces, and industrial control systems where shunt topology simplifies design.
FAQ
What is the maximum operating temperature range for the LM4040CIM3-2.5?
The LM4040CIM3-2.5 is rated for industrial temperature operation from −40°C to +85°C. It is not qualified for extended temperature (−40°C to +125°C) operation unless specified as LM4040CEM3-2.5 or automotive-grade LM4040CQIM3-2.5. Always verify grade suffix against TI's official orderable addendum.
Can the LM4040CIM3-2.5 drive capacitive loads without oscillation?
Yes-the LM4040CIM3-2.5 is explicitly characterized to remain stable with capacitive loads up to 10 nF, eliminating need for series resistance or external compensation. This makes it suitable for direct connection to ADC reference inputs and op-amp non-inverting inputs without risk of peaking or ringing.
Is a bypass capacitor required for the LM4040CIM3-2.5?
No bypass capacitor is required for stability. The LM4040CIM3-2.5's internal design ensures unconditional stability with no external capacitor. However, a 100 nF ceramic capacitor between cathode and anode is recommended for high-frequency noise suppression in noisy environments-this does not affect stability.
What is the minimum cathode current needed for the LM4040CIM3-2.5 to regulate accurately?
The LM4040CIM3-2.5 requires a minimum cathode current of 60 μA at 25°C to maintain regulation within specification. Below this, output voltage drops nonlinearly. At full temperature range (−40°C to +85°C), minimum current increases to 65 μA-designers must size the series resistor accordingly.
How does the LM4040CIM3-2.5 differ from the LM4040AIM3-2.5?
The LM4040CIM3-2.5 has ±0.5% initial tolerance and 100 ppm/°C max tempco, while the LM4040AIM3-2.5 offers tighter ±0.1% tolerance and same tempco. Both share identical SOT-23-3 package, pinout, and electrical behavior-only accuracy grade differs. Select C-grade for cost-sensitive designs where ±0.5% meets system requirements.
LM4040CIM3-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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.
LM4040CIM3-2.5 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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