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Texas Instruments LM4140CCMX-2.5/NOPB
- Part No.:
- LM4140CCMX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140CCMX-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,959
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Product details
Overview
LM4140CCMX-2.5/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 2.5 V output with ±0.1% initial accuracy, 3 ppm/°C temperature coefficient (C grade), and 20 mV typical dropout at 1 mA load. It features an enable pin for power management, consumes only 230 µA in active mode and ≤1 µA in shutdown, and is optimized for precision data acquisition systems requiring stable, low-drift references.
For engineers reviewing the LM4140CCMX-2.5/NOPB datasheet, LM4140CCMX-2.5/NOPB pinout, LM4140CCMX-2.5/NOPB application, or LM4140CCMX-2.5/NOPB equivalent, key selection criteria include initial accuracy, thermal drift, dropout voltage under load, enable-controlled power cycling, and compatibility with 1-µF output capacitance for stability.
Technical Context
The LM4140CCMX-2.5/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling sub-bandgap voltage options and superior resolution versus conventional bandgap references. Its P-channel pass transistor architecture supports operation down to VIN = VREF + 200 mV over temperature.
It operates across 0°C to 70°C, requires a mandatory 1-µF output capacitor for loop stability and transient response, and integrates internal discharge circuitry that actively sinks charge from the output capacitor during shutdown-ensuring fast, controlled turnoff within 200 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.1% initial accuracy - enables direct interface with 12-bit+ SAR ADCs without calibration. |
| Tempco (C Grade) | 3 ppm/°C - ensures ≤525 ppm (0.0525%) max drift over 0°C–70°C operating range. |
| Dropout Voltage | 20 mV (typ) at 1 mA - allows operation from 2.52 V supply, critical for single-cell Li-ion or low-voltage battery systems. |
| Supply Current | 230 µA (typ) active / ≤1 µA shutdown - extends battery life in portable instrumentation and sensor nodes. |
| Output Noise | 2.2 µVPP (0.1–10 Hz) - supports high-resolution weigh scales and medical front-ends where noise floor dominates ENOB. |
| Enable Logic | Active-high, VIH ≥ 0.8×VIN - compatible with standard CMOS logic; must not float; ties directly to VIN if unused. |
| Output Drive | ±8 mA - sufficient to drive ADC reference inputs, op-amp buffers, or small DAC loads without external gain. |
Pinout & Package
LM4140CCMX-2.5/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not present. Pin 5 is NC (no connect); pins 1, 4, 7, and 8 are ground terminals for low-impedance return paths and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Four dedicated ground connections reduce ground bounce and improve PSRR; all must be tied to system ground plane. |
| 2 | VIN | Positive input supply; minimum 2.52 V required for full 2.5 V output regulation at 1 mA load. |
| 3 | Enable | Active-high digital control; pulling low disables output and reduces current to ≤1 µA; must be tied to VIN if unused. |
| 5 | NC | No internal connection; must remain unconnected and unstubbed on PCB. |
| 6 | VREF | 2.5 V regulated output; capable of sourcing/sinking up to ±8 mA; requires 1-µF ceramic/tantalum capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 3 ppm/°C tempco and 0.1% initial accuracy without laser trimming-reducing unit cost and improving batch consistency. |
| Active output discharge | Internally discharges COUT to GND during shutdown-prevents floating reference and eliminates need for external bleed resistors. |
| Ultra-low 0.1–10 Hz noise | 2.2 µVPP enables <16-bit effective resolution in DC-coupled precision measurement chains. |
| Low dropout at light load | 20 mV dropout at 1 mA allows use with 2.52 V supplies-ideal for energy-harvesting and coin-cell-powered sensors. |
| Multi-ground pin layout | Four GND pins minimize ground path impedance and improve thermal conduction-critical for maintaining accuracy under varying load conditions. |
Applications
| Precision Data Acquisition | Portable Medical Instrumentation |
|---|---|
Use Scenario: High-resolution 16-bit SAR ADC in handheld blood glucose meter or ECG front-end. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion reference rail and analog signal conditioning. Use Value: 0.1% initial accuracy and 3 ppm/°C drift ensure calibrated measurement repeatability across environmental shifts without recalibration. | Use Scenario: Battery-powered pulse oximeter with ultra-low standby power budget. IC Role / Device Role / Timing Role: Stable 2.5 V reference for photodiode transimpedance amplifier and ADC reference. Use Value: ≤1 µA shutdown current and 230 µA active current extend coin-cell life beyond 2 years in intermittent-sampling mode. |
| Industrial Process Control Sensors | Automotive Cabin Monitoring |
Use Scenario: 4–20 mA transmitter module for pressure or temperature transducers in factory automation. IC Role / Device Role / Timing Role: Precision excitation source for bridge sensors and reference for loop-current DAC. Use Value: 20 mV dropout enables operation from 3.3 V rail while maintaining full 2.5 V output-reducing need for auxiliary LDOs. | Use Scenario: Occupancy detection system using capacitive sensing and low-power microcontroller in automotive infotainment. IC Role / Device Role / Timing Role: Reference for capacitive-to-digital converter (CDC) and analog front-end biasing. Use Value: Low 2.2 µVPP noise prevents false triggers in high-gain, low-frequency sensing channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025IDR | 2.5 V, 0.05% initial accuracy, 3 ppm/°C, 1.2 mA supply current, no enable pin | Higher accuracy but higher quiescent current; lacks enable for power cycling | Choose REF5025IDR when absolute long-term stability and lower tempco tolerance are prioritized over power savings. |
| ADR4525BRZ | 2.5 V, 0.02% initial accuracy, 2 ppm/°C, 950 µA supply current, no enable pin | Superior accuracy and tempco, but no enable function and higher IQ; requires external shutdown circuitry | Choose ADR4525BRZ for metrology-grade applications where enable functionality is unnecessary and lowest possible drift is critical. |
Compared with LM4140CCMX-2.5/NOPB, REF5025IDR offers tighter initial accuracy but doubles supply current and removes enable control-making it less suitable for battery-constrained designs. ADR4525BRZ delivers best-in-class drift performance but sacrifices power efficiency and integrated enable, requiring additional components for power gating.
Availability
LM4140CCMX-2.5/NOPB is available at Aetrix Electronics and suitable for precision data acquisition systems, portable medical instrumentation, industrial process control sensors, and automotive cabin monitoring applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM4140CCMX-2.5/NOPB 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with leadership in precision analog ICs and power management solutions.
The LM4140 product line was designed specifically for high-accuracy, low-noise, low-power voltage reference applications in portable, battery-operated, and industrial measurement systems-emphasizing trimmable stability, wide supply range, and integrated enable functionality.
FAQ
What is the recommended output capacitor value for LM4140CCMX-2.5/NOPB?
The LM4140CCMX-2.5/NOPB requires a 1-µF capacitor between VREF and GND for guaranteed loop stability and transient response. TI validates performance with solid tantalum (e.g., Kemet T491A105M010AS) and multilayer ceramic capacitors meeting ESR requirements. Values below 0.2 µF risk instability, especially over temperature.
Does LM4140CCMX-2.5/NOPB support operation below 2.5 V input?
Yes-LM4140CCMX-2.5/NOPB supports input voltages as low as VREF + 200 mV (2.7 V typical) across temperature. At 25°C, dropout is 20 mV at 1 mA, enabling reliable 2.5 V regulation from a 2.52 V supply-ideal for single-cell LiFePO₄ or boosted coin-cell systems.
How does the enable pin function on LM4140CCMX-2.5/NOPB?
The enable pin on LM4140CCMX-2.5/NOPB is active-high: driving it to ≥0.8×VIN enables the reference; pulling it ≤0.4 V disables output and reduces supply current to ≤1 µA. If unused, it must be tied directly to VIN-not left floating-to prevent erratic behavior or increased noise.
Can LM4140CCMX-2.5/NOPB drive an ADC reference input directly?
Yes-LM4140CCMX-2.5/NOPB can directly drive most SAR and delta-sigma ADC reference inputs. With ±8 mA output capability and 2.2 µVPP low-frequency noise, it meets requirements for 16-bit+ converters. For high-speed or high-capacitance ADCs, verify dynamic loading per the specific ADC's reference input spec.
What is the thermal hysteresis specification for LM4140CCMX-2.5/NOPB?
LM4140CCMX-2.5/NOPB exhibits ≤20 ppm thermal hysteresis-defined as the change in 25°C output voltage after cycling between 0°C and 70°C. This low hysteresis ensures repeatable accuracy in systems subject to repeated thermal cycling, such as outdoor industrial sensors or automotive ECUs.
LM4140CCMX-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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
LM4140CCMX-2.5/NOPB FAQ
1.How can I place an order for LM4140CCMX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140CCMX-2.5/NOPB 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 LM4140CCMX-2.5/NOPB reliable?
The price and inventory of LM4140CCMX-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4140CCMX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140CCMX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140CCMX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140CCMX-2.5/NOPB?
LM4140CCMX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140CCMX-2.5/NOPB 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 LM4140CCMX-2.5/NOPB?
For technical support, including LM4140CCMX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140CCMX-2.5/NOPB requirements.
6.How does Aetrix verify that LM4140CCMX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140CCMX-2.5/NOPB 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 LM4140CCMX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140CCMX-2.5/NOPB?
All LM4140CCMX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140CCMX-2.5/NOPB, 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 LM4140CCMX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4140CCMX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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