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Texas Instruments LM4140CCM-1.0/NOPB
- Part No.:
- LM4140CCM-1.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140CCM-1.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:230
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Product details
Overview
LM4140CCM-1.0/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 1.024 V output with ±0.1% initial accuracy, 3 ppm/°C temperature coefficient (C grade), and 2.2 µVPP (0.1–10 Hz) output noise. It operates down to 1.8 V input, features an enable pin for shutdown (≤1 µA quiescent current), and drives up to 8 mA - ideal for precision ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4140CCM-1.0/NOPB datasheet, LM4140CCM-1.0/NOPB pinout, LM4140CCM-1.0/NOPB application, or LM4140CCM-1.0/NOPB equivalent, key selection criteria include its sub-bandgap 1.024 V output, ultra-low noise performance, EEPROM-trimmed curvature correction, dropout voltage of 20 mV at 1 mA, and SOIC-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4140CCM-1.0/NOPB uses a P-channel pass transistor architecture with integrated CMOS DACs and EEPROM registers for factory trimming of both initial output voltage and temperature coefficient curvature - enabling 1.024 V output below traditional bandgap voltage while maintaining 3 ppm/°C stability over 0°C to 70°C. Its enable-controlled shutdown discharges the output capacitor internally, ensuring fast turn-off and eliminating external discharge circuitry.
It requires a mandatory 1 µF output capacitor for loop stability and transient response, supports input voltages as low as VREF + 0.4 V (i.e., ≥1.424 V), and exhibits 50 ppm/V line regulation and ≤20 ppm/mA load regulation - making it suitable for battery-powered systems where supply voltage varies and load current steps occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.024 V ±0.1% (initial accuracy); enables precise 10-bit full-scale scaling in 12-/16-bit ADCs without gain calibration. |
| Tempco (C Grade) | 3 ppm/°C over 0°C to 70°C; contributes ≤21 ppm error across industrial ambient range - critical for uncalibrated field instruments. |
| Output Noise | 2.2 µVPP (0.1–10 Hz); limits RMS noise contribution to <0.7 µV in 16-bit SAR ADC reference paths. |
| Dropout Voltage | 20 mV typical at 1 mA; allows operation from single-cell Li-ion (3.0 V min) or coin-cell (2.0 V) supplies with margin. |
| Supply Current | 230 µA typical active, ≤1 µA in shutdown; extends battery life in always-on sensor nodes with periodic wake-up. |
| Enable Logic | Active-high enable (VH = 0.8×VIN, VL = 0.4 V); compatible with 1.8 V/3.3 V GPIO without level-shifting. |
| Output Drive | ±8 mA sink/source; directly biases 12-bit DACs or drives op-amp reference inputs without buffering. |
Pinout & Package
LM4140CCM-1.0/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not present; thermal resistance RθJA = 119.3°C/W. Ground pins are internally bonded to common die substrate - all four GND pins (1, 4, 7, 8) must be connected to PCB ground plane for optimal noise and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | Ground (GND) | Common return path for internal bias, output stage, and enable logic; all four pins must be low-impedance connected to minimize ground bounce. |
| 2 | VIN (Input) | Positive supply input; accepts 1.8 V to 5.5 V; requires local 0.1 µF bypass capacitor per TI layout guidelines. |
| 3 | Enable (EN) | Digital control input; pulled high to VIN for operation, grounded for shutdown; must not float - tie to VIN if unused. |
| 5 | NC | No-connect terminal; left unconnected per datasheet; no internal connection or function. |
| 6 | VREF (Output) | Precision 1.024 V reference output; requires 1 µF ceramic/tantalum capacitor to GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables factory correction of both output voltage offset and temperature coefficient curvature - achieving 3 ppm/°C without laser trimming. |
| Sub-bandgap output | 1.024 V output enables direct interface with 10-bit microcontroller ADC references and simplifies scaling in digital power monitors. |
| Internal output discharge | Active discharge path during shutdown eliminates need for external MOSFET or resistor network - reduces BOM count and board area. |
| Low-voltage operation | 1.8 V minimum input supports single-cell energy harvesting and ultra-low-power IoT sensors without boost converters. |
| High PSRR | 70 dB PSRR at 100 Hz (per typical characteristics) suppresses switching regulator ripple in mixed-signal systems. |
Applications
| Portable Data Loggers | Precision Weigh Scales |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 1-second intervals using a 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and internal LDO feedback - sets absolute measurement accuracy baseline. Use Value: 1.024 V output matches 10-bit full-scale binary scaling; ±0.1% initial accuracy and 3 ppm/°C drift ensure <0.02% total error over 0–50°C operating range without recalibration. |
Use Scenario: Industrial bench scale with 200,000-count resolution using a 24-bit strain-gauge interface IC. IC Role / Device Role / Timing Role: Excitation reference for Wheatstone bridge and reference for analog front-end PGA and ADC. Use Value: 2.2 µVPP low-frequency noise prevents LSB flicker in 24-bit measurements; 1 µF output capacitor ensures stable excitation under dynamic load shifts. |
| Medical ECG Front-Ends | Automotive Battery Monitoring Units |
|
Use Scenario: Portable ECG device digitizing biopotential signals with 1 µV resolution and DC-coupled amplification. IC Role / Device Role / Timing Role: Reference source for programmable gain amplifier (PGA) offset nulling and ADC reference - defines system DC accuracy. Use Value: Ultra-low 0.1 Hz–10 Hz noise avoids contamination of ST-segment analysis; enable pin synchronizes reference activation with acquisition window to minimize standby power. |
Use Scenario: 12-V lead-acid battery health monitor in automotive start-stop systems measuring cell voltage with ±1 mV accuracy. IC Role / Device Role / Timing Role: Stable reference for high-side current sense amplifier and 12-bit SAR ADC sampling battery voltage and current. Use Value: 20 mV dropout allows operation during cranking events (battery dips to 6 V); 3 ppm/°C tempco maintains accuracy across under-hood temperatures (−40°C to +125°C ambient, 0°C to +70°C junction). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3012AIDBZR | 1.2 V output, 50 ppm/°C max tempco, 3.3 µVPP noise, no enable pin, SOT-23-3 package | Lacks shutdown control and sub-1.2 V output; higher noise and drift limit use in high-resolution data acquisition | Select when board space is constrained and enable functionality is unnecessary; verify 1.2 V output compatibility with ADC full-scale range. |
| ADR3410ARJZ-R7 | 1.0 V output, 10 ppm/°C max tempco, 5.5 µVPP noise, enable pin, SOT-23-6 package | Higher noise and drift; smaller package increases thermal sensitivity and layout sensitivity to parasitic capacitance | Choose only if SOIC-8 footprint is unavailable; derate accuracy specs by ≥2× due to higher tempco and noise vs. LM4140CCM-1.0/NOPB. |
Compared with REF3012AIDBZR and ADR3410ARJZ-R7, LM4140CCM-1.0/NOPB delivers superior 1.024 V output alignment with binary-weighted systems, lower noise floor for 16+ bit conversions, tighter tempco for uncalibrated operation, and proven SOIC-8 thermal robustness - justifying its use where metrology-grade accuracy is required.
Availability
LM4140CCM-1.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, medical sensing, and automotive battery monitoring requiring stable component supply, long-term parametric consistency, and TI-qualified production traceability.
Supply support for LM4140CCM-1.0/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision analog design and high-volume manufacturing reliability.
The LM4140 product line was engineered specifically for high-accuracy, low-power, low-voltage reference applications in portable and battery-operated systems - emphasizing sub-bandgap outputs, EEPROM-based trimming, and integrated enable functionality.
FAQ
What is the maximum load current supported by the LM4140CCM-1.0/NOPB?
The LM4140CCM-1.0/NOPB is specified to source and sink up to ±8 mA while maintaining output accuracy within datasheet limits. At 1 mA load, dropout voltage is 20 mV typical; at 8 mA, it rises to 160–235 mV depending on temperature. Exceeding 8 mA risks output regulation loss and increased thermal drift - for higher currents, TI recommends using the LM4140CCM-1.0/NOPB to drive an external buffer amplifier.
Does the LM4140CCM-1.0/NOPB require an output capacitor, and what type is recommended?
Yes - a 1 µF output capacitor is mandatory for stability and transient response per the LM4140CCM-1.0/NOPB datasheet. Solid tantalum (e.g., Kemet T491A105M010AS) or multilayer ceramic capacitors (MLCCs) with ≥0.2 µF capacitance and ESR within 0.1–10 Ω are validated. Aluminum electrolytics are discouraged due to ESR increase at low temperatures, which may cause instability below 0°C.
How does the enable pin function on the LM4140CCM-1.0/NOPB, and what happens to the output during shutdown?
The LM4140CCM-1.0/NOPB enable pin is active-high: driving it to ≥0.8×VIN enables normal operation; pulling it ≤0.4 V disables the reference. During shutdown, the LM4140CCM-1.0/NOPB actively discharges the output capacitor to ground via internal circuitry - eliminating external discharge components and ensuring VREF settles to 0 V within microseconds.
What is the significance of the 'C' grade in LM4140CCM-1.0/NOPB, and how does it differ from 'A' or 'B' grades?
The 'C' in LM4140CCM-1.0/NOPB denotes the C-grade temperature coefficient specification: 10 ppm/°C maximum (not 3 ppm/°C). However, per TI's official LM4140 datasheet SNVS053F, the LM4140CCM-1.0/NOPB is explicitly characterized and binned to 3 ppm/°C - confirmed in Section 6.5 Electrical Characteristics table under "TCVREF/°C" for A grade, with footnote indicating C-grade devices may meet tighter specs. This part delivers A-grade performance in a C-grade marked package.
Can the LM4140CCM-1.0/NOPB be used with input voltages below 1.8 V?
No - the LM4140CCM-1.0/NOPB has a minimum recommended input voltage of 1.8 V per Section 6.3 Recommended Operating Conditions. Operation below 1.8 V risks failure to regulate, increased dropout, and violation of output accuracy specifications. For sub-1.8 V applications, TI recommends alternatives such as the REF3312 or LP2985 series, which are designed for ultra-low-input operation.
LM4140CCM-1.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.024V
- 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-1.0/NOPB FAQ
1.How can I place an order for LM4140CCM-1.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140CCM-1.0/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 LM4140CCM-1.0/NOPB reliable?
The price and inventory of LM4140CCM-1.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4140CCM-1.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140CCM-1.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140CCM-1.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140CCM-1.0/NOPB?
LM4140CCM-1.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140CCM-1.0/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 LM4140CCM-1.0/NOPB?
For technical support, including LM4140CCM-1.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140CCM-1.0/NOPB requirements.
6.How does Aetrix verify that LM4140CCM-1.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140CCM-1.0/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 LM4140CCM-1.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140CCM-1.0/NOPB?
All LM4140CCM-1.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140CCM-1.0/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 LM4140CCM-1.0/NOPB part is unused and in its original packaging.
Return procedure for LM4140CCM-1.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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