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Texas Instruments LM4140CCM-2.5
- Part No.:
- LM4140CCM-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140CCM-2.5.pdf
- Description:
- LM4140 - THREE TERMINAL VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:35,625
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Product details
Overview
LM4140CCM-2.5 from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 2.5 V output with ±0.1% initial accuracy, 10 ppm/°C temperature coefficient (C grade), and 20 mV typical dropout at 1 mA. It features an enable pin for power management and supports portable instrumentation, precision DACs, and battery-powered data acquisition systems.
For engineers reviewing the LM4140CCM-2.5 datasheet, LM4140CCM-2.5 pinout, LM4140CCM-2.5 application, or LM4140CCM-2.5 equivalent, key selection considerations include its 2.5 V fixed output, ultra-low 2.2 µVPP (0.1–10 Hz) noise, 230 µA typical supply current, shutdown current ≤1 µA, and SOIC-8 package compatibility with standard PCB layouts.
Technical Context
The LM4140CCM-2.5 uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling higher resolution than conventional bandgap references. Its P-channel pass transistor architecture supports operation down to VIN = VREF + 20 mV (typical) across 0°C to 70°C.
It operates in two functional modes: normal (EN = VIN) and shutdown (EN = GND), with VREF restored in <200 µs on enable. The device requires a mandatory 1 µF output capacitor for loop stability and transient response, and internally discharges this capacitor during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.1% initial accuracy - ensures direct compatibility with 12-bit+ ADC/DAC full-scale ranges without external calibration. |
| Tempco (C Grade) | 10 ppm/°C - guarantees ≤175 µV drift over 0°C to 70°C ambient, critical for lab-grade measurement stability. |
| Dropout Voltage | 20 mV (typ) at 1 mA - enables operation from 2.52 V supply, ideal for single-cell Li-ion or regulated 2.7 V rails. |
| Output Noise | 2.2 µVPP (0.1–10 Hz) - low enough to avoid degrading ENOB in 16-bit SAR ADCs used in precision sensor front-ends. |
| Supply Current | 230 µA (typ), ≤1 µA in shutdown - extends battery life in portable multimeters and handheld analyzers. |
| Enable Threshold | VH = 0.8×VIN, VL = 0.4 V - compatible with 1.8 V, 3.3 V, and 5 V logic without level-shifting. |
| Output Drive | ±8 mA - sufficient to directly drive ADC reference inputs, op-amp buffers, or small DAC loads without external gain stages. |
Pinout & Package
LM4140CCM-2.5 is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm) with exposed pad not electrically connected. Ground pins (1, 4, 7, 8) must all be tied to system ground for optimal noise and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Common ground return path for internal bias, output stage, and enable logic - all four pins must be soldered to ground plane. |
| 2 | VIN | Positive supply input - accepts 2.52 V to 5.5 V; requires local 0.1 µF bypass capacitor per TI layout guidelines. |
| 3 | EN | Active-high enable control - pulled high to VIN for operation; driven low to GND for shutdown (≤1 µA IQ). |
| 5 | NC | No-connect terminal - must remain unconnected and unstubbed to avoid parasitic coupling or EMI. |
| 6 | VREF | 2.5 V precision output - capable of sourcing/sinking up to 8 mA; requires 1 µF ceramic capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 0.1% initial accuracy and 10 ppm/°C tempco without laser trimming - reduces unit cost while maintaining metrology-grade performance. |
| Ultra-low 1/f noise | 2.2 µVPP (0.1–10 Hz) - eliminates measurable noise contribution in DC-coupled strain gauge or thermocouple signal chains. |
| Fast enable recovery | <200 µs VREF stabilization - supports burst-mode sampling in portable DMMs and energy-harvesting sensor nodes. |
| Internal output discharge | Active discharge of COUT during shutdown - prevents holdover errors when re-enabling in multi-channel multiplexed systems. |
| Low-voltage operation | Functional down to VIN = 2.52 V - allows direct use with buck-boost regulators in wide-input industrial sensors. |
Applications
| Portable Multimeter Reference | Precision DAC Reference |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 16-bit ADC conversion across 0°C–50°C operating range. IC Role / Device Role / Timing Role: Primary voltage reference source for ADC full-scale calibration and autoranging circuitry. Use Value: 10 ppm/°C tempco and 0.1% initial accuracy eliminate need for onboard calibration coefficients, reducing firmware complexity and BOM count. | Use Scenario: Industrial PLC analog output module using 16-bit DAC to generate 4–20 mA signals with ±0.05% total unadjusted error. IC Role / Device Role / Timing Role: Fixed 2.5 V reference for DAC VREF input, enabling monotonic 0–5 V output with guaranteed 1 LSB linearity. Use Value: 2.2 µVPP noise ensures no degradation of DAC effective resolution - maintains >15.5 ENOB across full temperature range. |
| Data Acquisition Front-End | Battery-Powered Sensor Node |
Use Scenario: Wireless vibration sensor node with MEMS accelerometer, 24-bit sigma-delta ADC, and BLE radio. IC Role / Device Role / Timing Role: Low-noise, low-power reference for ADC and internal LDO feedback, synchronized to sampling clock. Use Value: 230 µA supply current and ≤1 µA shutdown mode extend coin-cell life to >2 years in sleep-wake cycles, while 20 mV dropout preserves headroom at end-of-life battery voltage. | Use Scenario: Portable environmental monitor measuring CO₂, humidity, and temperature using electrochemical and capacitive sensors. IC Role / Device Role / Timing Role: Master reference for sensor excitation, ADC, and internal voltage monitoring circuits. Use Value: Enable pin allows synchronous power gating of entire analog subsystem - reducing average system current by >95% during idle periods without reference settling delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy, 50 ppm/°C tempco, no enable pin, SOT-23-3 package | Lacks shutdown control and has 5× higher tempco - unsuitable for portable instruments requiring <100 ppm total drift. | Choose only if board space is constrained and enable functionality is unnecessary. |
| ADR3425ARJZ-R7 | 2.5 V, ±0.1% initial accuracy, 10 ppm/°C tempco, no enable pin, SOT-23-5 package | Matches accuracy/tempco but lacks enable - requires external MOSFET switch for power gating, adding complexity and leakage risk. | Select when highest possible long-term stability is needed and shutdown is managed externally. |
Compared with REF3025AIDBZR and ADR3425ARJZ-R7, LM4140CCM-2.5 uniquely integrates precision (0.1%), low drift (10 ppm/°C), ultra-low noise (2.2 µVPP), and active enable control in a single SOIC-8 package - eliminating trade-offs between size, power, and performance in portable and battery-critical designs.
Availability
LM4140CCM-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition systems, and battery-powered sensor nodes requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4140CCM-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 decades of leadership in precision analog ICs.
The LM4140 product line was engineered specifically for high-accuracy, low-noise, low-power voltage reference applications in portable test equipment, industrial sensors, and medical diagnostics - prioritizing metrological integrity over cost-driven compromises.
FAQ
What is the maximum load current supported by the LM4140CCM-2.5?
The LM4140CCM-2.5 can source or sink up to ±8 mA while maintaining specified accuracy and stability. At 8 mA load, dropout voltage rises to 235 mV (max) over temperature. For higher currents, TI recommends using the LM4140CCM-2.5 to drive an external buffer amplifier or PNP pass transistor, as shown in the datasheet's "Boosted Output Current" application circuit.
Does the LM4140CCM-2.5 require an output capacitor, and what type is recommended?
Yes - a 1 µF ceramic capacitor is mandatory between VREF and GND for loop stability and transient response. TI validates X7R and X5R dielectrics with ESR between 0.1 Ω and 10 Ω. Tantalum capacitors (e.g., Kemet T491A105M010AS) are also qualified, but aluminum electrolytics are discouraged below 0°C due to ESR rise. The LM4140CCM-2.5 will oscillate or exhibit overshoot without this capacitor.
How does the enable pin function on the LM4140CCM-2.5, and what happens during shutdown?
The LM4140CCM-2.5 enable pin is active-high: driving it to ≥0.8×VIN enables the reference; pulling it to GND disables it. During shutdown, VREF drops to 0 V within 10 µs, and the internal circuit actively discharges the output capacitor to ground - preventing residual voltage that could cause errors in multiplexed systems. Supply current falls to ≤1 µA.
What is the temperature coefficient grade of the LM4140CCM-2.5, and how is it designated in the part number?
The LM4140CCM-2.5 is a C-grade device, meaning it has a maximum temperature coefficient of 10 ppm/°C over 0°C to 70°C. The "C" in the suffix "CCM" denotes the C-grade tempco; "A" and "B" grades offer 3 ppm/°C and 6 ppm/°C respectively. All grades share identical 0.1% initial accuracy and SOIC-8 packaging.
Can the LM4140CCM-2.5 be used with input voltages below 2.5 V?
No - the LM4140CCM-2.5 is a series reference requiring VIN ≥ VREF + dropout voltage. With 2.5 V output and 20 mV typical dropout, minimum VIN is 2.52 V at 1 mA load. At 8 mA, minimum VIN rises to 2.735 V (2.5 V + 235 mV). Operation below 2.52 V will result in loss of regulation and unpredictable VREF.
LM4140CCM-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 8 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 2.2µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 1.8V ~ 5.5V
- Current - Supply:
- 375µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM4140CCM-2.5 FAQ
1.How can I place an order for LM4140CCM-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140CCM-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 LM4140CCM-2.5 reliable?
The price and inventory of LM4140CCM-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 LM4140CCM-2.5 is usually 5 days.
3.What payment methods are accepted for LM4140CCM-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140CCM-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140CCM-2.5?
LM4140CCM-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140CCM-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 LM4140CCM-2.5?
For technical support, including LM4140CCM-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140CCM-2.5 requirements.
6.How does Aetrix verify that LM4140CCM-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4140CCM-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 LM4140CCM-2.5 meets industry standards.
7.What is the process for return or replacement of LM4140CCM-2.5?
All LM4140CCM-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4140CCM-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 LM4140CCM-2.5 part is unused and in its original packaging.
Return procedure for LM4140CCM-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4140CCM-2.5 Tags
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