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Texas Instruments LM4140BCMX-2.0/NOPB
- Part No.:
- LM4140BCMX-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140BCMX-2.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,230
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Product details
Overview
LM4140BCMX-2.0/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 2.048 V output with ±0.1% initial accuracy, 6 ppm/°C temperature coefficient (B grade), 20 mV typical dropout at 1 mA, and 230 µA typical supply current. It features an enable pin for power management and is used in precision ADC/DAC biasing, portable instrumentation, and battery-powered data acquisition systems.
For engineers reviewing the LM4140BCMX-2.0/NOPB datasheet, LM4140BCMX-2.0/NOPB pinout, LM4140BCMX-2.0/NOPB application, or LM4140BCMX-2.0/NOPB equivalent, key selection considerations include its 2.048 V output voltage, 6 ppm/°C tempco, enable-controlled shutdown (<1 µA), 1 µF required output capacitance, and SOIC-8 package compatibility with precision analog signal chains.
Technical Context
The LM4140BCMX-2.0/NOPB employs EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling sub-bandgap 2.048 V output with 6 ppm/°C stability over 0°C to 70°C. Its P-channel series pass architecture supports operation down to VIN = VREF + 20 mV (typ) and delivers up to 8 mA output current.
It operates in two functional modes: normal regulation (EN = VIN) and ultra-low-power shutdown (EN = GND, IS(OFF) ≤1 µA). The internal circuit actively discharges the output capacitor during disable, ensuring fast turn-on (<200 µs) and controlled power sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V ±0.1% (initial accuracy); enables precise 12-bit full-scale scaling in ADCs/DACs |
| Tempco (B Grade) | 6 ppm/°C over 0°C to 70°C; ensures ≤0.42 mV drift across industrial ambient range |
| Dropout Voltage | 20 mV (typ) at 1 mA; allows operation from 2.068 V supply-critical for single-cell Li-ion or coin-cell systems |
| Supply Current | 230 µA (typ) active; ≤1 µA in shutdown; reduces quiescent power in always-on sensor nodes |
| Output Noise | 2.2 µVPP (0.1–10 Hz); supports high-resolution 16+ bit measurement without added filtering |
| Load Regulation | 20 ppm/mA (typ); maintains stability under dynamic load changes in multiplexed data acquisition |
| Enable Threshold | VH = 0.8×VIN, VL = 0.4 V; compatible with 1.8 V, 3.3 V, and 5 V logic interfaces |
Pinout & Package
LM4140BCMX-2.0/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not present. Pin functions are validated per TI SNVS053F Rev F datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Four dedicated ground terminals minimize ground impedance and improve PSRR/noise rejection |
| 2 | VIN | Positive input supply; must be ≥ VREF + 20 mV; accepts 1.8 V to 5.5 V operation |
| 3 | Enable | Digital control input; pull high to enable, low to enter <1 µA shutdown mode |
| 5 | NC | No-connect terminal; must remain unconnected per datasheet |
| 6 | VREF | Regulated 2.048 V output; capable of sourcing up to 8 mA with 1 µF output capacitor |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 0.1% initial accuracy and 6 ppm/°C tempco without laser trimming-reducing cost and process variability |
| Active output discharge | Internally sinks output capacitor charge during shutdown, preventing voltage hold-up and enabling clean power sequencing |
| Low-noise architecture | 2.2 µVPP (0.1–10 Hz) noise floor supports 16-bit+ resolution without external filtering or post-regulation |
| Sub-bandgap output | 2.048 V option matches common 12-bit full-scale binary codes (2¹² = 4096), eliminating scaling resistors in DAC interfaces |
| Wide supply range | Operates from 1.8 V to 5.5 V input-supports direct connection to LDO outputs or partially discharged batteries |
Applications
| Portable Data Loggers | Precision Weigh Scales |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 100 Hz with 16-bit ADC. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC and analog front-end op-amps; provides stable 2.048 V scale for ratiometric sensor excitation and digitization. Use Value: 6 ppm/°C tempco and 2.2 µVPP noise ensure ≤0.01% measurement error across 0–50°C operating range without calibration. |
Use Scenario: Industrial bench scale using 350 Ω strain gauge bridge with 24-bit ΣΔ ADC. IC Role / Device Role / Timing Role: Excitation source for bridge and reference for ADC; supplies matched 2.048 V to both bridge legs and ADC REF+ pin. Use Value: 0.1% initial accuracy and thermal hysteresis <20 ppm eliminate zero-point drift during warm-up and ambient cycling. |
| Medical ECG Signal Chain | Automotive Battery Monitor IC Reference |
|
Use Scenario: Portable ECG device acquiring microvolt-level biopotentials with >100 dB SNR requirement. IC Role / Device Role / Timing Role: Low-noise reference for programmable gain instrumentation amplifier and 24-bit ADC; powers bias circuitry for electrode interface. Use Value: Ultra-low 2.2 µVPP noise directly limits system noise floor-enabling detection of <1 µV differential signals without additional filtering. |
Use Scenario: In-vehicle 12 V battery voltage and temperature monitoring using microcontroller with integrated 12-bit ADC. IC Role / Device Role / Timing Role: External reference replacing MCU's internal VREF to improve ADC linearity and reduce temperature-induced gain error. Use Value: 20 mV dropout allows direct use of 3.3 V LDO output; enable pin synchronizes reference activation with ADC conversion bursts-cutting average current by 99.5%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5020IDR | 2.048 V, 3 ppm/°C (A grade), 3.8 µVPP noise, 1.2 mA supply current, no enable pin | Lacks shutdown mode; higher power; better tempco/noise but less suitable for intermittent-sampling systems | Choose when ultimate long-term stability and lower noise outweigh power savings and sequencing needs. |
| ADR3420ARJZ-R7 | 2.048 V, 10 ppm/°C (J grade), 3.5 µVPP noise, 120 µA supply current, enable pin included | Higher tempco; lower quiescent current; smaller SOT-23-6 package; limited output drive (5 mA) | Choose for space-constrained designs where 10 ppm/°C drift is acceptable and load current ≤5 mA. |
Compared with LM4140BCMX-2.0/NOPB, REF5020IDR offers superior temperature stability and noise but lacks enable control and consumes 5× more active current; ADR3420ARJZ-R7 provides comparable enable functionality and lower IQ in a smaller footprint but trades 1.7× higher tempco and reduced output drive capability.
Availability
LM4140BCMX-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, and automotive battery monitoring requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM4140BCMX-2.0/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 company specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and signal chain solutions.
The LM4140 product line was designed to deliver sub-bandgap, EEPROM-trimmed voltage references for high-resolution data converters and portable equipment demanding ultra-low power, low noise, and tight initial accuracy.
FAQ
What is the minimum input voltage required for stable operation of the LM4140BCMX-2.0/NOPB?
The LM4140BCMX-2.0/NOPB requires VIN ≥ VREF + 20 mV (typical) for regulation-i.e., ≥2.068 V at 1 mA load. At 8 mA, dropout rises to 235 mV (max), so VIN ≥2.283 V is recommended for full-load operation across temperature. Below this, output voltage droops nonlinearly and regulation is lost.
Does the LM4140BCMX-2.0/NOPB require an output capacitor, and if so, what type and value?
Yes-the LM4140BCMX-2.0/NOPB requires a 1 µF output capacitor for loop stability and transient response. Solid tantalum (e.g., Kemet T491A105M010AS) or multilayer ceramic (≥0.2 µF, with ESR within TI-specified range) are validated. Aluminum electrolytics are discouraged below 0°C due to ESR rise causing instability.
How does the enable pin function on the LM4140BCMX-2.0/NOPB, and what happens to the output during shutdown?
The LM4140BCMX-2.0/NOPB enable pin turns the device on when pulled to VIN and off when pulled to GND. During shutdown, the output is actively discharged to ground via internal circuitry-preventing voltage hold-up and enabling safe, sequenced power-down in multi-rail systems.
Can the LM4140BCMX-2.0/NOPB drive a 10 kΩ load directly, and what is its maximum output current?
Yes-the LM4140BCMX-2.0/NOPB can drive a 10 kΩ load (205 µA at 2.048 V) with minimal error. Its specified output current capability is up to 8 mA (sink/source limited by internal pass transistor), verified across temperature and line/load conditions in the datasheet's Electrical Characteristics table.
What is the thermal hysteresis specification for the LM4140BCMX-2.0/NOPB, and how does it impact calibration?
The LM4140BCMX-2.0/NOPB exhibits ≤20 ppm thermal hysteresis-defined as the 25°C output voltage shift after cycling between 0°C and 70°C. This translates to ≤41 µV error, making it suitable for one-time factory calibration in systems where re-calibration is impractical, such as sealed medical or automotive modules.
LM4140BCMX-2.0/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:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 8 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 6ppm/°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
LM4140BCMX-2.0/NOPB FAQ
1.How can I place an order for LM4140BCMX-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140BCMX-2.0/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 LM4140BCMX-2.0/NOPB reliable?
The price and inventory of LM4140BCMX-2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4140BCMX-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140BCMX-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140BCMX-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140BCMX-2.0/NOPB?
LM4140BCMX-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140BCMX-2.0/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 LM4140BCMX-2.0/NOPB?
For technical support, including LM4140BCMX-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140BCMX-2.0/NOPB requirements.
6.How does Aetrix verify that LM4140BCMX-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140BCMX-2.0/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 LM4140BCMX-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140BCMX-2.0/NOPB?
All LM4140BCMX-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140BCMX-2.0/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 LM4140BCMX-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4140BCMX-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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