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Texas Instruments LM4140BCMX-2.5/NOPB
- Part No.:
- LM4140BCMX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140BCMX-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,789
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Product details
Overview
LM4140BCMX-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. It features an enable pin for power management and supports precision ADC/DAC biasing in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4140BCMX-2.5/NOPB datasheet, LM4140BCMX-2.5/NOPB pinout, LM4140BCMX-2.5/NOPB application, or LM4140BCMX-2.5/NOPB equivalent, key selection criteria include ultra-low 2.2 µVPP (0.1–10 Hz) noise, 230 µA typical supply current, ≤1 µA shutdown current, and SOIC-8 package compatibility with 1 µF output capacitance requirements.
Technical Context
The LM4140BCMX-2.5/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling sub-bandgap 2.5 V output with 3 ppm/°C drift over 0°C to 70°C. Its P-channel pass transistor architecture supports operation down to VIN = VREF + 20 mV (typical), enabling use in ultra-low-voltage systems.
It integrates active output capacitor discharge during disable mode, achieving <200 µs turn-on time and zero-output settling. The enable pin accepts logic-level control (VH ≥ 0.8×VIN, VL ≤ 0.4 V), with internal pull-down not provided-requiring external tie-high if unused.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.1% (initial accuracy at 25°C; C-grade) |
| Temp Coefficient | 3 ppm/°C (0°C to 70°C; ensures ≤525 ppm total drift across range) |
| Dropout Voltage | 20 mV (typical at 1 mA; enables operation from 2.52 V supply) |
| Output Noise | 2.2 µVPP (0.1–10 Hz; critical for 16+ bit ADC/DAC reference stability) |
| Supply Current | 230 µA (typical active; ≤1 µA in shutdown-extends battery life) |
| Load Drive | 8 mA (sinks/sources up to 8 mA while maintaining accuracy) |
| Enable Threshold | VIL ≤ 0.4 V, VIH ≥ 0.8×VIN (supports direct MCU GPIO control without level shift) |
Pinout & Package
LM4140BCMX-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 functions are validated per TI SNVS053F Rev F datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Four dedicated ground terminals reduce ground impedance and improve PSRR/noise rejection |
| 2 | VIN | Positive input supply; must be ≥ VREF + 20 mV for regulation |
| 3 | Enable | Active-high digital control; drives output to 0 V when pulled low |
| 5 | NC | No-connect terminal; must remain unconnected and floating |
| 6 | VREF | Stable 2.5 V output; requires 1 µF ceramic/tantalum capacitor to GND for stability |
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 process variation |
| Active output discharge | Internally discharges COUT to GND during disable-prevents voltage hold-up and enables fast system reset |
| Ultra-low 1/f noise | 2.2 µVPP (0.1–10 Hz) directly supports high-resolution SAR and delta-sigma ADCs without external filtering |
| Low dropout architecture | 20 mV dropout at 1 mA allows operation from single-cell Li-ion (3.0 V min) or coin-cell (3 V) supplies |
| Shutdown current | ≤1 µA max at 25°C-enables microamp-level sleep modes in portable data loggers |
Applications
| Portable Data Acquisition | Precision DAC Biasing |
|---|---|
Use Scenario: Handheld multimeter acquiring 16-bit voltage measurements from sensor front-ends. IC Role / Device Role / Timing Role: Primary 2.5 V reference for SAR ADC and analog signal chain calibration. Use Value: 3 ppm/°C tempco and 2.2 µVPP noise ensure <±0.01% measurement accuracy across 0–50°C ambient range. | Use Scenario: Industrial PLC module generating programmable analog outputs via 16-bit DAC. IC Role / Device Role / Timing Role: Stable, low-drift reference source for DAC VREF input. Use Value: 0.1% initial accuracy and 8 mA drive capability eliminate need for external buffer op-amps in most configurations. |
| Battery-Powered Instrumentation | Medical Sensor Signal Conditioning |
Use Scenario: Wearable ECG monitor operating from CR2032 coin cell with multi-day runtime. IC Role / Device Role / Timing Role: Low-power 2.5 V reference for analog front-end and ADC reference rail. Use Value: 230 µA active current and ≤1 µA shutdown current extend battery life beyond 1000 hours in intermittent sampling mode. | Use Scenario: Portable pulse oximeter requiring stable excitation voltage for LED drivers and photodiode TIA. IC Role / Device Role / Timing Role: Precision DC bias source for optical channel calibration and gain setting. Use Value: Ultra-low 1/f noise prevents baseline wander in DC-coupled physiological signal paths. |
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, 3.6 µVPP noise, SOIC-8, 950 µA supply current | Higher accuracy but 4× higher quiescent current; no enable pin | Choose REF5025IDR only when 0.05% initial accuracy is mandatory and power budget allows >900 µA continuous draw. |
| ADR4525BRZ | 2.5 V, 0.02% initial accuracy, 2 ppm/°C, 1.75 µVPP noise, SOIC-8, 950 µA supply current, no enable | Lower noise and tempco, but no enable function and higher supply current | Choose ADR4525BRZ for metrology-grade applications where enable functionality is unnecessary and lowest possible drift is required. |
Compared with REF5025IDR and ADR4525BRZ, LM4140BCMX-2.5/NOPB uniquely balances ultra-low power (230 µA), integrated enable, and 3 ppm/°C performance-making it optimal for battery-constrained, intermittently active systems where moderate accuracy suffices.
Availability
LM4140BCMX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, and battery-powered medical devices requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LM4140BCMX-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, designing and manufacturing analog ICs, embedded processors, and high-reliability components for industrial, automotive, and consumer markets.
The LM4140 product line delivers high-accuracy, low-noise, low-dropout voltage references optimized for portable, battery-powered, and precision measurement applications where power efficiency and thermal stability are critical.
FAQ
What is the minimum input voltage required for LM4140BCMX-2.5/NOPB to regulate properly?
The LM4140BCMX-2.5/NOPB requires VIN ≥ VREF + 20 mV (typical) at 1 mA load, i.e., ≥2.52 V. At 8 mA load, dropout rises to 160–235 mV, so VIN ≥ 2.66 V is recommended for full-load operation across temperature. This low dropout enables use with single-cell Li-ion or alkaline supplies.
Does LM4140BCMX-2.5/NOPB require an output capacitor, and what type is recommended?
Yes-LM4140BCMX-2.5/NOPB requires a minimum 1 µF output capacitor for loop stability and transient response. Solid tantalum (e.g., Kemet T491A105M010AS) or multilayer ceramic capacitors (≥0.2 µF, with ESR within TI-specified range) are recommended. Aluminum electrolytics are discouraged below 0°C due to ESR rise.
How does the enable pin of LM4140BCMX-2.5/NOPB behave during shutdown?
When the enable pin is pulled low (<0.4 V), LM4140BCMX-2.5/NOPB disables its output and actively discharges the external output capacitor to ground via internal circuitry. Output settles to 0 V within microseconds, and supply current drops to ≤1 µA-ensuring clean, predictable power-down behavior.
Can LM4140BCMX-2.5/NOPB drive 8 mA continuously while maintaining its specified accuracy?
Yes-LM4140BCMX-2.5/NOPB is rated for 8 mA continuous output current with ≤20 ppm/mA load regulation (typical). At 8 mA and 25°C, output voltage deviation remains within ±0.002% of 2.5 V. Load regulation degrades slightly over temperature (≤150 ppm/mA at 0–70°C), remaining well within 0.1% total error budget.
What is the significance of the four ground pins on LM4140BCMX-2.5/NOPB?
The four dedicated ground pins (pins 1, 4, 7, 8) minimize ground path impedance and inductance, improving PSRR (>80 dB at 1 kHz), reducing noise coupling, and stabilizing regulation under dynamic load conditions. They must all be connected to a low-impedance system ground plane for optimal performance.
LM4140BCMX-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:
- 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-2.5/NOPB FAQ
1.How can I place an order for LM4140BCMX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140BCMX-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 LM4140BCMX-2.5/NOPB reliable?
The price and inventory of LM4140BCMX-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 LM4140BCMX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140BCMX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140BCMX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140BCMX-2.5/NOPB?
LM4140BCMX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140BCMX-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 LM4140BCMX-2.5/NOPB?
For technical support, including LM4140BCMX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140BCMX-2.5/NOPB requirements.
6.How does Aetrix verify that LM4140BCMX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140BCMX-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 LM4140BCMX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140BCMX-2.5/NOPB?
All LM4140BCMX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140BCMX-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 LM4140BCMX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4140BCMX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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