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Texas Instruments LM4140CCMX-4.1
- Part No.:
- LM4140CCMX-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140CCMX-4.1.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,794
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Product details
Overview
LM4140CCMX-4.1 from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 4.096 V output with ±0.1% initial accuracy, 10 ppm/°C temperature coefficient (C grade), and 2.2 µVPP (0.1–10 Hz) output noise. It operates down to 1.8 V input, supports up to 8 mA load, and features an enable pin for power management - ideal for precision DACs and portable instrumentation.
For engineers reviewing the LM4140CCMX-4.1 datasheet, LM4140CCMX-4.1 pinout, LM4140CCMX-4.1 application, or LM4140CCMX-4.1 equivalent, key selection criteria include dropout voltage at 1 mA (20 mV typ), supply current in active mode (265 µA typ), disable current (0.01 µA typ), thermal hysteresis (20 ppm), and required 1-µF output capacitor for stability.
Technical Context
The LM4140CCMX-4.1 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 enables low dropout and reverse-current protection via intrinsic body diode.
It operates in two functional modes: normal regulation (EN = VIN) and shutdown (EN = GND), achieving full output restoration in <200 µs. The device requires a 1-µF output capacitor for loop stability and transient response, with ESR constraints validated for tantalum, ceramic, and aluminum electrolytic types per TI application guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V - precisely matches 12-bit full-scale DAC reference (e.g., 4096 × 1 mV), minimizing code-dependent gain error. |
| Initial Accuracy | ±0.1% - ensures ≤4.1 mV absolute output deviation at 25°C without calibration. |
| Temp Coefficient | 10 ppm/°C - contributes ≤0.29 mV drift over 0°C to 70°C ambient range. |
| Dropout Voltage | 20 mV (typ @ 1 mA) - allows operation with VIN as low as 4.116 V, critical for single-cell Li-ion or low-voltage rail systems. |
| Output Noise | 2.2 µVPP (0.1–10 Hz) - enables ≤1 LSB noise floor in 16-bit ADC systems referenced to 4.096 V. |
| Supply Current | 265 µA (typ @ 25°C) - supports multi-year battery life in always-on sensor nodes drawing <300 µA total. |
| Disable Current | 0.01 µA (typ) - reduces standby power to nanowatt level during system sleep cycles. |
| Load Drive | 8 mA - directly drives SAR ADC reference inputs, op-amp buffers, or small DAC loads without external gain stage. |
Pinout & Package
LM4140CCMX-4.1 is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not electrically connected. Pin assignments 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 by separating analog return paths. |
| 2 | VIN | Positive supply input - accepts 1.8 V to 5.5 V; must be ≥ VREF + 20 mV for regulation. |
| 3 | Enable | Digital control input - pulled high to VIN for active mode; grounded to disable output and reduce IQ to 0.01 µA. |
| 5 | NC | No-connect terminal - must remain unconnected; no internal connection or function. |
| 6 | VREF | Precision output - delivers 4.096 V with sourcing capability up to 8 mA; requires 1-µF capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 0.1% initial accuracy and 10 ppm/°C TC without laser trimming - improves production yield and long-term stability. |
| Sub-bandgap output | 4.096 V option targets exact 12-bit full-scale scaling - eliminates digital gain correction in microcontroller-based data acquisition. |
| Ultra-low 0.1–10 Hz noise | 2.2 µVPP supports high-resolution weigh scales and medical front-ends where 1/f noise dominates measurement uncertainty. |
| Active output discharge | Internal circuitry discharges COUT to GND during shutdown - prevents floating reference and ensures monotonic power-up behavior. |
| Reverse current protection | Inherent P-channel body diode blocks >50 mA reverse current from VREF to VIN - protects against back-driving during power sequencing faults. |
Applications
| Portable Instrumentation | Precision DAC Reference |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and battery-powered operation. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion, providing stable 4.096 V scale independent of battery voltage decay. Use Value: Enables true 16-bit resolution (65,536 steps) with ≤1 LSB integral nonlinearity due to 0.1% initial accuracy and 10 ppm/°C drift. | Use Scenario: Industrial PLC analog output module generating 0–10 V signals via 12-bit DAC. IC Role / Device Role / Timing Role: Reference source for DAC's internal resistor ladder, directly setting full-scale output voltage. Use Value: 4.096 V output maps exactly to 4096 DAC codes - eliminates firmware scaling and minimizes gain error across temperature. |
| Strain Gauge Signal Chain | Battery-Powered Data Logger |
Use Scenario: Wireless structural health monitor using 350-Ω Wheatstone bridge and low-power MCU. IC Role / Device Role / Timing Role: Excitation source for bridge, supplying precise 4.096 V common-mode voltage to maximize dynamic range. Use Value: Low 2.2 µVPP noise ensures <0.001% RMS noise contribution to bridge output, preserving µV-level strain resolution. | Use Scenario: Environmental sensor node logging temperature/humidity every 5 minutes on coin cell. IC Role / Device Role / Timing Role: Reference for ADC measuring thermistor voltage divider, enabled only during sampling. Use Value: 0.01 µA shutdown current extends 10-year battery life; fast 200 µs wake-up ensures minimal sampling latency. |
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 TC, 10 µVPP noise, SOIC-8, 0.95 mA supply current | Higher accuracy and lower drift, but 3.6× higher quiescent current and no enable pin | Preferred when ultra-stable reference is required and power budget allows >900 µA continuous draw. |
| ADR444BRZ | 4.096 V, 0.04% initial accuracy, 3 ppm/°C TC, 1.8 µVPP noise, SOIC-8, 750 µA supply current, no enable | Lower noise and tighter specs, but lacks enable functionality and consumes >2.5× more current | Select when lowest possible noise is critical and system does not require dynamic power cycling of reference. |
Compared with REF5040IDR and ADR444BRZ, LM4140CCMX-4.1 trades minor accuracy and drift for integrated enable control and 3–4× lower active supply current - making it optimal for battery-constrained, intermittently active measurement systems where fast wake-up and nanowatt shutdown matter most.
Availability
LM4140CCMX-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, precision DAC reference design, and battery-powered data loggers requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4140CCMX-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 designing analog ICs, embedded processors, and system solutions for industrial, automotive, and personal electronics markets.
The LM4140 product line delivers high-accuracy, low-noise, low-dropout voltage references with EEPROM-based trimming - engineered specifically for precision data acquisition, portable test equipment, and battery-operated instrumentation demanding sub-0.1% initial tolerance and minimal thermal drift.
FAQ
What is the recommended output capacitor value for stable operation of LM4140CCMX-4.1?
The LM4140CCMX-4.1 requires a minimum 1-µF output capacitor connected between VREF and GND for loop stability and transient response. TI validates performance with solid tantalum (e.g., Kemet T491A105M010AS), ceramic (e.g., Murata GRM42-6Y5V225Z16), and aluminum electrolytic types - provided ESR falls within specified ranges per Figures 22–24 in the SNVS053F datasheet. Using less than 0.2 µF risks oscillation.
Does LM4140CCMX-4.1 support operation below 2.0 V input voltage?
Yes - LM4140CCMX-4.1 supports input voltages as low as 1.8 V, provided VIN ≥ VREF + 20 mV (i.e., ≥4.116 V for the 4.096 V output). This 20 mV dropout voltage is specified at 1 mA load and 25°C. At 8 mA or elevated temperatures, dropout increases to ≤45 mV, requiring VIN ≥4.141 V minimum under worst-case conditions.
How does the enable pin function on LM4140CCMX-4.1, and what are its voltage thresholds?
The enable pin (Pin 3) controls LM4140CCMX-4.1's operational state: driven to VIN for normal operation (VH ≥ 0.8 × VIN), or grounded for shutdown (VL ≤ 0.4 V). Logic high input current is ≤2 nA; logic low current is ≤1 nA. Pulling EN to GND reduces supply current to 0.01 µA (typ), and VREF restores fully within 200 µs when re-enabled.
Can LM4140CCMX-4.1 drive a 10 kΩ load directly without external buffering?
Yes - LM4140CCMX-4.1 can directly drive a 10 kΩ load (drawing 409.6 µA at 4.096 V) while maintaining regulation. Its 8 mA output capability exceeds this requirement by 20×. Load regulation is specified at 5 ppm/mA (typ), contributing only ~2 ppm error - well within the device's 0.1% initial accuracy. No buffer is needed unless output impedance or noise isolation is critical.
What is the thermal hysteresis specification for LM4140CCMX-4.1, and how does it impact calibration?
LM4140CCMX-4.1 exhibits ≤20 ppm thermal hysteresis - defined as the maximum change in 25°C output voltage after cycling between 0°C and 70°C. This corresponds to ≤82 µV shift in 4.096 V output. For systems requiring <0.01% repeatability (e.g., metrology-grade instruments), this hysteresis must be characterized during final calibration and compensated in firmware or hardware trim.
LM4140CCMX-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:
- 10ppm/°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
LM4140CCMX-4.1 FAQ
1.How can I place an order for LM4140CCMX-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140CCMX-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 LM4140CCMX-4.1 reliable?
The price and inventory of LM4140CCMX-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 LM4140CCMX-4.1 is usually 5 days.
3.What payment methods are accepted for LM4140CCMX-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140CCMX-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140CCMX-4.1?
LM4140CCMX-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140CCMX-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 LM4140CCMX-4.1?
For technical support, including LM4140CCMX-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140CCMX-4.1 requirements.
6.How does Aetrix verify that LM4140CCMX-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4140CCMX-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 LM4140CCMX-4.1 meets industry standards.
7.What is the process for return or replacement of LM4140CCMX-4.1?
All LM4140CCMX-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4140CCMX-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 LM4140CCMX-4.1 part is unused and in its original packaging.
Return procedure for LM4140CCMX-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4140CCMX-4.1 Tags
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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