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Texas Instruments LM4140BCMX-4.1
- Part No.:
- LM4140BCMX-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140BCMX-4.1.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,281
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Product details
Overview
LM4140BCMX-4.1 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 (B grade), and enable-controlled shutdown consuming ≤1 µA. It operates from as low as 1.8 V input and delivers up to 8 mA output current - used in precision DACs, data acquisition systems, and portable instrumentation requiring stable, low-drift references.
For engineers reviewing the LM4140BCMX-4.1 datasheet, LM4140BCMX-4.1 pinout, LM4140BCMX-4.1 application, or LM4140BCMX-4.1 equivalent, key selection considerations include dropout voltage at 1 mA (20 mV typ), ultra-low 0.1 Hz–10 Hz noise (2.2 µVPP), supply current (265 µA typ), enable logic thresholds, and required 1 µF output capacitor for stability.
Technical Context
The LM4140BCMX-4.1 employs 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 active output discharge during disable mode, fast turn-on (<200 µs), and operation across 0°C to 70°C. The device requires external 1 µF output capacitance with specified ESR range and tolerates input voltages from VREF + 200 mV (i.e., ≥4.296 V) up to 5.5 V for stable regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.1% (initial accuracy); enables precise 12-bit full-scale scaling in ADC/DAC systems |
| Tempco (B Grade) | 6 ppm/°C max over 0°C to 70°C; ensures ≤0.43 mV drift across industrial temperature range |
| Dropout Voltage | 20 mV typical at 1 mA load; allows operation with only 4.116 V input, critical for low-voltage battery systems |
| Output Noise | 2.2 µVPP (0.1 Hz–10 Hz); minimizes quantization error in high-resolution 16+ bit data converters |
| Supply Current | 265 µA typical at 25°C; supports multi-year operation in coin-cell–powered portable meters |
| Shutdown Current | 0.01 µA typical; reduces system standby power to negligible levels in energy-harvesting applications |
| Line Regulation | 20 ppm/V typical (4.296 V–5.5 V input); maintains output stability despite battery voltage sag |
Pinout & Package
LM4140BCMX-4.1 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 | Four dedicated ground terminals reduce ground impedance and improve noise immunity; must be tied to PCB ground plane |
| 2 | VIN | Positive supply input; accepts 4.296 V to 5.5 V; requires local 0.1 µF bypass capacitor per layout guidelines |
| 3 | Enable | Digital control input; driven high (≥0.8×VIN) for active mode, low (≤0.4 V) for shutdown; must not float |
| 5 | NC | No-connect pin; must remain unconnected and unstubbed to avoid parasitic coupling |
| 6 | VREF | Regulated 4.096 V output; capable of sourcing 8 mA; requires 1 µF ceramic/tantalum capacitor to GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables factory-calibrated 0.1% initial accuracy and 6 ppm/°C tempco without laser trimming, improving yield and long-term stability |
| Active output discharge | Internally discharges output capacitor during shutdown, preventing voltage hold-up and enabling fast system reset sequencing |
| Low 0.1–10 Hz noise | 2.2 µVPP supports <1 LSB error in 16-bit SAR ADCs sampling at ≤100 kSPS without additional filtering |
| P-channel pass element | Eliminates reverse-current path issues common in N-channel designs; withstands VREF > VIN up to 50 mA sink current |
| Ultra-low shutdown current | 10 nA typical ensures <1 µA total system standby current when paired with microcontroller GPIO control |
Applications
| Precision DAC Reference | Data Acquisition System |
|---|---|
Use Scenario: Providing excitation voltage and reference for 16-bit DAC in portable calibration equipment. IC Role / Device Role / Timing Role: Primary voltage reference source; sets full-scale output range and determines absolute accuracy of analog output. Use Value: 4.096 V output matches 12-bit binary scaling (212 = 4096), eliminating gain calibration; 6 ppm/°C tempco holds INL within ±0.5 LSB over 0–70°C. |
Use Scenario: Front-end reference for multi-channel 18-bit sigma-delta ADC in environmental monitoring sensor node. IC Role / Device Role / Timing Role: Stable, low-noise reference for ADC conversion; synchronized with sampling clock via enable control. Use Value: 2.2 µVPP noise contributes <0.02 LSB RMS noise; 265 µA supply current enables continuous 10 SPS operation on single AA cell for >2 years. |
| Portable Medical Instrument | Battery-Powered Test Equipment |
Use Scenario: Reference for ECG signal conditioning and analog front-end in handheld patient monitor. IC Role / Device Role / Timing Role: Low-drift, low-noise reference for instrumentation amplifier gain-setting and ADC reference. Use Value: 0.1% initial accuracy and thermal hysteresis ≤20 ppm ensure baseline stability across clinical use cycles; 20 mV dropout extends usable battery life by 15% vs. legacy references. |
Use Scenario: Calibration reference in handheld multimeter with auto-ranging and autoranging ADC. IC Role / Device Role / Timing Role: Primary reference for internal self-calibration routine and measurement scaling. Use Value: EEPROM-trimmed performance eliminates field recalibration; enable pin allows reference activation only during measurement, reducing average power by 99.9%. |
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, 950 µA supply current, no enable pin | Higher accuracy but no shutdown; unsuitable for ultra-low-power intermittent-use systems | Select REF5040IDR when absolute initial accuracy dominates over power and enable functionality |
| ADR4540BRZ | 4.096 V, 0.02% initial accuracy, 2 ppm/°C, 1.75 µVPP noise, 950 µA supply current, no enable | Lower noise and tempco, but fixed 950 µA quiescent current; lacks enable and low-dropout capability | Select ADR4540BRZ for lab-grade instrumentation where power is secondary to ultimate precision |
Compared with REF5040IDR and ADR4540BRZ, LM4140BCMX-4.1 trades minor accuracy and noise performance for critical enable control, 265 µA operating current, and 20 mV dropout - making it uniquely suitable for battery-powered, intermittently active precision systems where dynamic power management is mandatory.
Availability
LM4140BCMX-4.1 is available at Aetrix Electronics and suitable for precision DAC reference design, portable medical instrumentation, battery-powered test equipment, data acquisition systems, and environmental sensor nodes requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4140BCMX-4.1 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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM4140 family was designed specifically to deliver high-accuracy, low-noise, low-dropout voltage references with integrated enable and EEPROM-based trimming - targeting portable, battery-constrained, and high-resolution measurement applications.
FAQ
What is the minimum input voltage required for stable operation of the LM4140BCMX-4.1?
The LM4140BCMX-4.1 requires a minimum input voltage of VREF + 200 mV, i.e., 4.296 V, to maintain regulation at 1 mA load across 0°C to 70°C. At 25°C, dropout is typically 20 mV, allowing operation down to 4.116 V - but full specification compliance mandates ≥4.296 V under worst-case conditions. This value is explicitly defined in Section 6.5 of the LM4140 datasheet.
Does the LM4140BCMX-4.1 require an output capacitor, and what type is recommended?
Yes, the LM4140BCMX-4.1 requires a 1 µF output capacitor connected between VREF and GND for loop stability and transient response. TI validates solid tantalum (e.g., Kemet T491A105M010AS) and multilayer ceramic capacitors (e.g., Murata GRM42-6Y5V225Z16) meeting ESR requirements in Figures 22–24. Aluminum electrolytics are discouraged below 0°C due to ESR rise.
How does the enable pin function on the LM4140BCMX-4.1, and what are its voltage thresholds?
The LM4140BCMX-4.1 enable pin (Pin 3) controls device state: logic high (≥0.8 × VIN) enables regulation; logic low (≤0.4 V) disables output and reduces supply current to ≤1 µA. Input leakage is ≤2 nA. The pin must never be left floating and may be driven by MCU GPIO or open-collector with pullup to VIN.
What is the output noise specification for the LM4140BCMX-4.1, and how does it scale with output voltage?
The LM4140BCMX-4.1 has 2.2 µVPP (0.1 Hz–10 Hz) output noise, measured on the 1.024 V variant and scaled linearly with VREF. For the 4.096 V version, noise is 2.2 µVPP × (4.096 / 1.024) = 8.8 µVPP. This is confirmed in Section 6.5 footnote (7) and Figure 11 of the datasheet.
Is the LM4140BCMX-4.1 pin-compatible with other members of the LM4140 family?
Yes, all LM4140 variants - including LM4140ACMX-4.1, LM4140BCMX-2.5, and LM4140CMX-1.25 - share identical 8-pin SOIC (D) packaging and pinout. Only the output voltage, initial accuracy grade (A/B/C), and tempco differ; no PCB redesign is needed when substituting within the same package option.
LM4140BCMX-4.1 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):
- 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 FAQ
1.How can I place an order for LM4140BCMX-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140BCMX-4.1 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 reliable?
The price and inventory of LM4140BCMX-4.1 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 is usually 5 days.
3.What payment methods are accepted for LM4140BCMX-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140BCMX-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140BCMX-4.1?
LM4140BCMX-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140BCMX-4.1 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?
For technical support, including LM4140BCMX-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140BCMX-4.1 requirements.
6.How does Aetrix verify that LM4140BCMX-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4140BCMX-4.1 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 meets industry standards.
7.What is the process for return or replacement of LM4140BCMX-4.1?
All LM4140BCMX-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4140BCMX-4.1, 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 part is unused and in its original packaging.
Return procedure for LM4140BCMX-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4140BCMX-4.1 Tags
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