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Analog Devices Inc./Maxim Integrated LM4040DIM3-2.5-T
- Part No.:
- LM4040DIM3-2.5-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040DIM3-2.5-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
LM4040DIM3-2.5-T from Maxim Integrated is a precision 2.500V fixed-output, two-terminal shunt voltage reference in SC70-3 package, featuring ±20mV initial accuracy (1.0%), 150ppm/°C max temperature coefficient, 60μA–15mA operating current range, and guaranteed operation from –40°C to +85°C. It serves as a stable reference in portable battery-powered systems where space and low quiescent current are critical.
For engineers reviewing the LM4040DIM3-2.5-T datasheet, LM4040DIM3-2.5-T pinout, LM4040DIM3-2.5-T application, or LM4040DIM3-2.5-T equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in space-constrained analog signal chains, and confirmed alternative options for design flexibility and supply continuity.
Technical Context
The LM4040DIM3-2.5-T implements a laser-trimmed bandgap core with no external capacitor required for stability, maintaining regulation across capacitive loads up to 1μF. Its shunt architecture sinks current to hold a precise reverse breakdown voltage at the cathode–anode terminals.
It operates over 60μA–15mA shunt current with dynamic impedance as low as 0.3Ω (typical at 1mA), enabling stable reference performance under varying load and supply conditions. The device exhibits 35µVRMS wideband noise (10Hz–10kHz) and long-term drift of 120ppm over 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±20mV at +25°C (1.0% grade); ensures accurate ADC/DAC biasing in 2.5V systems |
| Initial Accuracy | ±1.0% (±20mV) - defines worst-case offset error before calibration |
| Temp Coefficient | 150ppm/°C max - contributes ≤±12.5mV drift over –40°C to +85°C span |
| Operating Current | 60μA to 15mA - supports ultra-low-power sensor nodes and high-current reference buffers |
| Dynamic Impedance | 0.3Ω to 1.1Ω (1mA, 120Hz) - minimizes output voltage shift during transient load changes |
| Wideband Noise | 35µVRMS (10Hz–10kHz) - suitable for 12-bit precision data acquisition without added filtering |
| Long-Term Stability | 120ppm (1000h) - predicts <±0.3mV output drift over first year in field operation |
Pinout & Package
LM4040DIM3-2.5-T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23, optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to system ground or low-impedance return path; current flows into this pin during regulation |
| 2 (–) | Cathode (negative terminal) | Reference output node; maintains 2.500V relative to Pin 1 when reverse-biased |
| 3 (N.C.) | No connection | Must remain unconnected or tied to Pin 2; not internally bonded - floating connection risks ESD susceptibility |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint enables placement in tight spaces like wearable sensor modules |
| No output capacitor required | Stable with any capacitive load up to 1μF - eliminates BOM cost and layout area for decoupling cap |
| 150ppm/°C tempco (max) | Guaranteed over full –40°C to +85°C range - supports industrial-grade temperature margin without derating |
| 60μA minimum operating current | Enables micropower operation in battery-backed RTCs and energy-harvesting circuits |
| 2.500V fixed output | Matches common ADC reference rails and LDO feedback divider ratios without external scaling resistors |
Applications
| Portable Medical Sensors | Notebook Computer Power Management |
|---|---|
Use Scenario: Reference for analog front-end of wearable ECG/PPG sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.500V bias to instrumentation amplifiers and 12-bit SAR ADCs. Use Value: Enables <±1 LSB error over temperature with 60μA quiescent current, extending battery life beyond 12 months. |
Use Scenario: Precision reference for VRM feedback loops and battery fuel-gauge ICs in ultrabooks. IC Role / Device Role / Timing Role: Stable 2.500V reference for current-sense amplifier gain setting and coulomb counter calibration. Use Value: Maintains ±0.5% system-level power rail accuracy across –10°C to +60°C ambient, improving battery runtime estimation. |
| Industrial Process Transmitters | Smartphone Camera Module Calibration |
Use Scenario: 4–20mA loop transmitter with HART modulation requiring stable excitation voltage for RTD bridges. IC Role / Device Role / Timing Role: Two-terminal shunt reference generating precise 2.500V for bridge excitation and ADC reference. Use Value: Delivers 150ppm/°C stability over –40°C to +85°C, meeting IEC 61000-6-2 immunity requirements without thermal compensation. |
Use Scenario: On-module calibration reference for CMOS image sensor analog gain stages and lens actuator drivers. IC Role / Device Role / Timing Role: Compact 2.500V reference used during factory calibration to set analog gain offsets and white-balance baselines. Use Value: SC70-3 size allows integration directly on camera flex PCB; 35µVRMS noise prevents color channel crosstalk in 10-bit pipelines. |
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 | 2.5V ±0.5%, 75ppm/°C max, SOT23-3, 60μA–15mA | Narrower tempco and tighter initial tolerance, but larger SOT23 footprint | Select when higher accuracy and lower drift are prioritized over board space |
| REF3025AIDBZR | 2.5V ±0.2%, 50ppm/°C max, SOT23-3, 25μA–25mA, series topology | Series architecture requires input headroom; higher min current but lower noise (25µVRMS) | Choose for ultra-low-noise 16-bit systems where supply margin permits series drop |
Compared with TL4050C25IDBZR and REF3025AIDBZR, the LM4040DIM3-2.5-T offers the smallest footprint (SC70 vs SOT23) and true two-terminal simplicity, making it optimal for space-constrained shunt-regulated designs where 1.0% accuracy and 150ppm/°C stability meet system requirements.
Availability
LM4040DIM3-2.5-T is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power management, industrial process transmitters, and smartphone camera module calibration requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for LM4040DIM3-2.5-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, and computing applications, with emphasis on reliability, miniaturization, and low-power operation.
The LM4040 product line delivers micropower shunt voltage references optimized for space-critical, battery-operated systems requiring stable 2.048V–5.000V references without external compensation components.
FAQ
What is the maximum operating temperature range for LM4040DIM3-2.5-T?
The LM4040DIM3-2.5-T is rated for operation from –40°C to +85°C. This is the "I" grade temperature range, distinct from the "E" grade (–40°C to +125°C). Its absolute maximum junction temperature remains +150°C, but sustained operation above +85°C ambient requires careful thermal design and derating per the SC70 package's 2.17mW/°C derating factor.
Does LM4040DIM3-2.5-T require an external output capacitor?
No, the LM4040DIM3-2.5-T does not require an external output capacitor for stability. It is designed to remain stable with any capacitive load, including 0μF up to at least 1μF, eliminating the need for additional passive components and simplifying layout in compact designs.
What is the minimum shunt current needed for LM4040DIM3-2.5-T to regulate properly?
The LM4040DIM3-2.5-T requires a minimum shunt current of 60μA to maintain regulation within specification. Below this threshold, output voltage may deviate beyond the guaranteed ±20mV tolerance. Designers must ensure the source resistor and load conditions sustain ≥60μA across all operating temperatures and supply voltages.
How does the N.C. pin (Pin 3) affect LM4040DIM3-2.5-T functionality?
Pin 3 of the LM4040DIM3-2.5-T is a no-connect terminal and must either be left unconnected or tied directly to Pin 2 (cathode). It is not internally bonded; connecting it elsewhere or leaving it floating in high-noise environments may increase susceptibility to ESD or parasitic coupling, potentially affecting reference stability.
Can LM4040DIM3-2.5-T replace LM4040CIM3-2.5+T in an existing design?
Yes, the LM4040DIM3-2.5-T can replace the LM4040CIM3-2.5+T electrically and mechanically, as both are 2.5V shunt references in SC70-3 packages. However, the "D" grade has looser initial accuracy (±1.0% vs ±0.5%) and higher tempco (150ppm/°C vs 100ppm/°C), so system-level calibration or tolerance analysis must confirm suitability for the target application.
LM4040DIM3-2.5-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040DIM3-2.5-T FAQ
1.How can I place an order for LM4040DIM3-2.5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DIM3-2.5-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 LM4040DIM3-2.5-T reliable?
The price and inventory of LM4040DIM3-2.5-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DIM3-2.5-T is usually 5 days.
3.What payment methods are accepted for LM4040DIM3-2.5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DIM3-2.5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DIM3-2.5-T?
LM4040DIM3-2.5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DIM3-2.5-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 LM4040DIM3-2.5-T?
For technical support, including LM4040DIM3-2.5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DIM3-2.5-T requirements.
6.How does Aetrix verify that LM4040DIM3-2.5-T is sourced from the original manufacturer or authorized distributors?
All LM4040DIM3-2.5-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 LM4040DIM3-2.5-T meets industry standards.
7.What is the process for return or replacement of LM4040DIM3-2.5-T?
All LM4040DIM3-2.5-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DIM3-2.5-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 LM4040DIM3-2.5-T part is unused and in its original packaging.
Return procedure for LM4040DIM3-2.5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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