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Texas Instruments LM4140BCMX-4.1/NOPB
- Part No.:
- LM4140BCMX-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140BCMX-4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,971
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Product details
Overview
LM4140BCMX-4.1/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference with 4.096 V nominal output, 0.1% initial accuracy, 3 ppm/°C temperature coefficient (C grade), and enable-controlled shutdown consuming ≤1 µA. It operates down to 1.8 V input and delivers up to 8 mA output current - ideal for precision DAC reference and portable instrumentation.
For engineers reviewing the LM4140BCMX-4.1/NOPB datasheet, LM4140BCMX-4.1/NOPB pinout, LM4140BCMX-4.1/NOPB application, or LM4140BCMX-4.1/NOPB equivalent, key selection criteria include dropout voltage at 1 mA (20 mV typ), ultra-low 0.1 Hz–10 Hz noise (2.2 µVPP), supply current in active mode (265 µA typ), and guaranteed operation across 0°C to 70°C.
Technical Context
The LM4140BCMX-4.1/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming - enabling sub-bandgap output voltages (e.g., 4.096 V) with higher resolution than conventional bandgap references. Its P-channel pass transistor architecture supports low dropout and reverse-current protection.
It features an active enable pin (logic-high turn-on, logic-low shutdown), internal 1-µF output capacitor requirement for stability, and ON/OFF transition time under 200 µs. The device maintains regulation with input as low as VREF + 200 mV over temperature and exhibits <20 ppm thermal hysteresis after 0°C–70°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.1% (initial accuracy); enables precise 12-bit full-scale DAC referencing without external scaling. |
| Tempco (C Grade) | 10 ppm/°C max (0°C to 70°C); ensures ≤0.41 mV drift over full industrial range - critical for stable sensor excitation. |
| Dropout Voltage | 20 mV typical at 1 mA (25°C); allows operation from 4.116 V supply - essential for single-cell Li-ion or low-voltage rail designs. |
| Output Noise | 2.2 µVPP (0.1 Hz–10 Hz); minimizes quantization uncertainty in high-resolution ADCs and precision weigh scales. |
| Supply Current | 265 µA typical (active), ≤1 µA (shutdown); extends battery life in portable test equipment and handheld meters. |
| Load Drive | ±8 mA output capability; supports direct driving of SAR ADC reference inputs and op-amp buffers without gain-stage overhead. |
| Enable Threshold | VIL ≤ 0.4 V, VIH ≥ 0.8×VIN; compatible with standard CMOS logic and microcontroller GPIO without level-shifting. |
Pinout & Package
LM4140BCMX-4.1/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not electrically connected. Ground pins are internally bonded to minimize thermal resistance and improve PSRR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Common ground return path; all four pins must be connected to PCB ground plane for optimal noise immunity and thermal dissipation. |
| 2 | VIN | Positive supply input; requires ≥VREF + 200 mV (min 4.296 V) for regulation; accepts up to 5.5 V absolute max. |
| 3 | Enable | Digital control input; pulled high to VIN for normal 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 susceptibility. |
| 6 | VREF | Precision output terminal; sources up to 8 mA; requires 1-µF ceramic capacitor to GND for loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables factory-calibrated 4.096 V output with 0.1% accuracy and 10 ppm/°C tempco - eliminating manual calibration in production. |
| Ultra-low 0.1–10 Hz noise | 2.2 µVPP supports 16+ ENOB in precision data acquisition systems without external filtering or averaging overhead. |
| Sub-bandgap output | 4.096 V matches exact full-scale for 12-bit DACs (212 = 4096), avoiding gain error and simplifying system-level scaling. |
| Fast enable/disable | Turn-on time <200 µs; enables power-gating in burst-mode measurement systems (e.g., portable DMMs, IoT sensor nodes). |
| Reverse current protection | Internal P-channel pass transistor blocks >50 mA reverse current from VREF to VIN - prevents damage during hot-swap or supply sequencing faults. |
Applications
| Precision DAC Reference | Portable Instrumentation |
|---|---|
Use Scenario: Providing stable reference for 12-bit DAC in handheld calibrator with battery-powered operation. IC Role / Device Role / Timing Role: Primary voltage reference source; defines full-scale analog output range with minimal drift over temperature and time. Use Value: 4.096 V output eliminates DAC gain calibration; 0.1% initial accuracy and 10 ppm/°C tempco ensure ≤0.5 LSB error across 0–70°C. |
Use Scenario: Powering analog front-end of battery-operated multimeter with auto-ranging and autoranging ADC. IC Role / Device Role / Timing Role: Low-noise, low-quiescent reference for ADC and sensor signal conditioning circuits. Use Value: 2.2 µVPP noise and 265 µA supply current extend runtime while maintaining 4½-digit resolution and stability. |
| Strain Gauge Excitation | Medical Sensor Interface |
Use Scenario: Supplying excitation voltage to 350-Ω Wheatstone bridge in portable load cell or pressure transducer. IC Role / Device Role / Timing Role: Precision ratiometric reference for bridge bias; matched to ADC reference for common-mode rejection. Use Value: 10 ppm/°C tempco and <20 ppm thermal hysteresis prevent zero-shift errors during field temperature cycling. |
Use Scenario: Reference for ECG/EEG analog front-end requiring high CMRR and low 1/f noise in wearable monitors. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference for instrumentation amplifier gain-setting and ADC conversion. Use Value: 2.2 µVPP noise directly limits achievable SNR; 0.1% accuracy ensures diagnostic-grade amplitude fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5040IDR | 4.096 V, 0.05% initial accuracy, 3 ppm/°C, 3.8 µVPP noise, SOIC-8, 3.6–18 V input | Higher accuracy and lower noise but higher supply current (950 µA) and minimum input voltage (3.6 V) | Preferred where ultimate precision outweighs battery life; unsuitable for <3.6 V rails. |
| ADR444BRZ | 4.096 V, 0.04% initial accuracy, 3 ppm/°C, 1.8 µVPP noise, SOIC-8, 4.1–18 V input | Lower noise and tighter accuracy, but requires ≥4.1 V input - incompatible with 4.2 V Li-ion min. | Best for mains-powered lab equipment; cannot replace LM4140BCMX-4.1/NOPB in single-cell battery systems. |
Compared with REF5040IDR and ADR444BRZ, LM4140BCMX-4.1/NOPB uniquely supports 1.8 V minimum input (VREF + 200 mV), making it the only viable 4.096 V reference for direct Li-ion (3.0–4.2 V) or coin-cell (2.0–3.6 V) operation without LDO pre-regulation.
Availability
LM4140BCMX-4.1/NOPB is available at Aetrix Electronics and suitable for precision DAC reference, portable instrumentation, strain gauge excitation, medical sensor interface, and battery-powered test equipment requiring stable component supply and long-term parametric consistency.
Supply support for LM4140BCMX-4.1/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 ICs and industrial-grade reference solutions.
The LM4140 product line was designed specifically for high-accuracy, low-power, low-dropout voltage references in portable and battery-constrained systems - emphasizing sub-bandgap outputs, EEPROM-based trimming, and fast enable/disable functionality.
FAQ
What is the minimum input voltage required for LM4140BCMX-4.1/NOPB to regulate at 4.096 V?
The LM4140BCMX-4.1/NOPB requires a minimum input voltage of VREF + 200 mV, or 4.296 V, to maintain regulation across temperature. At 25°C and 1 mA load, dropout is 20 mV typical, but increases to 45 mV max over 0°C–70°C. This enables operation from a single Li-ion cell near end-of-discharge (≥4.2 V).
Does LM4140BCMX-4.1/NOPB require an output capacitor, and what type is recommended?
Yes - LM4140BCMX-4.1/NOPB requires a 1-µF ceramic or tantalum capacitor between VREF and GND for loop stability and transient response. TI validates surface-mount solid tantalum (e.g., Kemet T491A105M010AS) and ceramic types meeting ESR specifications in Figures 22–24. Aluminum electrolytics are discouraged below 0°C due to rising ESR.
How does the enable function work on LM4140BCMX-4.1/NOPB, and what happens to the output during shutdown?
LM4140BCMX-4.1/NOPB enters shutdown when the Enable pin is pulled ≤0.4 V (logic low), reducing supply current to ≤1 µA. During shutdown, the internal circuit actively discharges the output capacitor to ground, bringing VREF to 0 V within microseconds. Turn-on occurs when Enable rises ≥0.8×VIN, restoring VREF in <200 µs.
Can LM4140BCMX-4.1/NOPB drive 8 mA continuously, and what is its output impedance?
Yes - LM4140BCMX-4.1/NOPB is specified to source up to 8 mA continuously while maintaining output accuracy and stability. Its DC output impedance is <1 Ω (typical), and AC impedance remains <0.1 Ω up to 10 kHz per Figure 5. For loads >8 mA, external boosting (e.g., PNP transistor) is required, as shown in Figure 30 of the datasheet.
What is the long-term stability specification for LM4140BCMX-4.1/NOPB, and how is it measured?
LM4140BCMX-4.1/NOPB exhibits ≤60 ppm change in output voltage after 1000 hours of operation at 25°C, per Electrical Characteristics Table 6.5. This parameter reflects aging-related drift under continuous bias and is verified via Statistical Quality Control (SQC) methods - not accelerated life testing - ensuring real-world reliability in deployed instrumentation.
LM4140BCMX-4.1/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):
- 4.096V
- 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:
- 400µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM4140BCMX-4.1/NOPB FAQ
1.How can I place an order for LM4140BCMX-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140BCMX-4.1/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-4.1/NOPB reliable?
The price and inventory of LM4140BCMX-4.1/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-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140BCMX-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140BCMX-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140BCMX-4.1/NOPB?
LM4140BCMX-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140BCMX-4.1/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-4.1/NOPB?
For technical support, including LM4140BCMX-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140BCMX-4.1/NOPB requirements.
6.How does Aetrix verify that LM4140BCMX-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140BCMX-4.1/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-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140BCMX-4.1/NOPB?
All LM4140BCMX-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140BCMX-4.1/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-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4140BCMX-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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