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Texas Instruments LM4140ACMX-4.1/NOPB
- Part No.:
- LM4140ACMX-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140ACMX-4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,548
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Product details
Overview
LM4140ACMX-4.1/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 4.096 V output with ±0.1% initial accuracy, 3 ppm/°C temperature coefficient (A grade), and 2.2 µVPP (0.1–10 Hz) output noise. It operates down to 1.8 V input, supports 8 mA output current, and features an enable pin for shutdown mode drawing ≤1 µA. It is used in precision DACs, data acquisition systems, and portable instrumentation where stable, low-drift references are critical.
For engineers reviewing the LM4140ACMX-4.1/NOPB datasheet, LM4140ACMX-4.1/NOPB pinout, LM4140ACMX-4.1/NOPB application, or LM4140ACMX-4.1/NOPB equivalent, key selection criteria include initial accuracy, thermal drift, dropout voltage at 1 mA, enable logic thresholds, and required 1-µF output capacitor stability compliance.
Technical Context
The LM4140ACMX-4.1/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming - enabling sub-bandgap 4.096 V output with 3 ppm/°C drift over 0°C to 70°C. Its P-channel pass transistor architecture delivers low dropout (20 mV typ. at 1 mA) and reverse-current protection via inherent body diode.
It operates in two functional modes: normal (EN = VIN) and shutdown (EN = GND), with VREF restored in <200 µs on enable. The device requires a 1-µF output capacitor for loop stability and transient response, and its ground current includes quiescent + load-dependent components across pins 1, 4, 7, and 8.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.1% (initial accuracy at 25°C); enables precise 12-bit full-scale DAC referencing without scaling. |
| Temperature Coefficient | 3 ppm/°C (A grade, 0°C to 70°C); ensures ≤0.87 mV total drift across industrial ambient range. |
| Dropout Voltage | 20 mV typical at 1 mA (25°C); allows operation from 4.116 V supply - critical for battery-powered 4.2 V Li-ion systems. |
| Output Noise | 2.2 µVPP (0.1–10 Hz); supports high-resolution sigma-delta ADCs (e.g., 24-bit) without added filtering. |
| Supply Current | 265 µA typical (ON, 25°C); 0.01 µA typical (OFF); enables microamp-level system sleep current budgets. |
| Enable Threshold | VH = 0.8×VIN, VL = 0.4 V; compatible with 3.3 V and 5 V logic without level-shifting. |
| Output Drive | ±8 mA sourcing/sinking; sufficient to directly drive ADC reference inputs and op-amp buffers. |
Pinout & Package
LM4140ACMX-4.1/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm), with exposed pad not electrically connected. Ground connections are distributed across four pins to minimize ground impedance 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; accepts 1.8 V to 5.5 V; requires local 0.1 µF bypass capacitor per layout guidelines. |
| 3 | Enable | Digital control input; pulled high to VIN for operation; driven low to GND for shutdown (≤1 µA IQ). |
| 5 | NC | No-connect terminal; must remain unconnected and unstubbed to avoid parasitic coupling. |
| 6 | VREF | Precision 4.096 V output; requires 1 µF ceramic/tantalum capacitor to GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 3 ppm/°C drift and 0.1% initial accuracy without laser trimming - improves production yield and long-term stability. |
| Sub-bandgap output | 4.096 V option enables direct interface with 12-bit DACs and ADCs using VREF = VDD/2n scaling without external dividers. |
| Active output discharge | Internal circuitry discharges COUT to GND during shutdown - prevents floating reference and ensures monotonic power-up behavior. |
| Low-voltage operation | Functional down to 1.8 V input supports single-cell Li-ion (3.0–4.2 V) and coin-cell (3 V) powered portable instruments. |
| Reverse current protection | Inherent P-channel body diode blocks >50 mA reverse current from VREF to VIN - eliminates need for external blocking diodes. |
Applications
| Portable Data Loggers | Precision DAC Reference |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node acquiring temperature, pressure, and humidity with 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC and analog front-end; provides stable 4.096 V reference independent of battery voltage sag. Use Value: Enables 0.5 LSB integral nonlinearity performance over 0–70°C due to 3 ppm/°C drift and 2.2 µVPP noise. |
Use Scenario: Industrial 16-bit DAC generating calibrated analog outputs for PLC analog modules. IC Role / Device Role / Timing Role: High-accuracy, low-drift reference source for DAC VREF pin; supplies up to 8 mA with minimal load regulation error. Use Value: Delivers ±0.1% initial accuracy and <150 ppm/mA load regulation - maintains DAC monotonicity and end-point accuracy. |
| Medical Patient Monitors | Strain Gauge Signal Conditioning |
|
Use Scenario: Portable ECG/SpO₂ monitor requiring low-noise, low-power analog signal chain with FDA-grade accuracy. IC Role / Device Role / Timing Role: Reference for instrumentation amplifier gain-setting and ADC conversion; enabled only during active measurement cycles. Use Value: 0.01 µA shutdown current extends battery life; 2.2 µVPP noise avoids adding quantization uncertainty in microvolt-level bio-potential signals. |
Use Scenario: Load cell interface in digital weighing scale using 350 Ω Wheatstone bridge. IC Role / Device Role / Timing Role: Excitation voltage source for bridge; supplies stable 4.096 V to maximize bridge SNR and resolution. Use Value: 3 ppm/°C drift limits zero-point drift to <1.4 µV/°C - reduces recalibration frequency and improves repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5040AIDR | 4.096 V, 0.05% initial accuracy, 3 ppm/°C, 10 µVPP noise, 1.2 mA IQ, no enable pin | Higher accuracy but higher quiescent current and no shutdown - unsuitable for battery-cycled systems | Select when absolute initial accuracy outweighs power budget; requires external enable circuitry if shutdown needed |
| ADR4540BRZ | 4.096 V, 0.02% initial accuracy, 2 ppm/°C, 1.8 µVPP noise, 950 µA IQ, no enable pin | Lower noise and drift but 4× higher supply current and no enable - incompatible with ultra-low-power designs | Choose for lab-grade instrumentation where power is secondary to noise/drift; add discrete FET switch if shutdown required |
Compared with REF5040AIDR and ADR4540BRZ, LM4140ACMX-4.1/NOPB uniquely balances 0.1% accuracy, 3 ppm/°C drift, 2.2 µVPP noise, and integrated enable functionality at 265 µA - making it the only drop-in solution for portable, battery-gated precision systems requiring both performance and power control.
Availability
LM4140ACMX-4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, medical monitoring devices, and industrial data acquisition systems requiring stable component supply, long-term calibration integrity, and RoHS-compliant packaging.
Supply support for LM4140ACMX-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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and high-reliability components for industrial, automotive, and communications markets.
The LM4140 product line was developed to deliver sub-bandgap precision references with EEPROM-based trimming for high-volume portable and battery-operated applications demanding low drift, low noise, and micropower shutdown capability.
FAQ
What is the minimum input voltage required for stable operation of LM4140ACMX-4.1/NOPB?
The LM4140ACMX-4.1/NOPB requires a minimum input voltage of VREF + 20 mV (i.e., 4.116 V) at 1 mA load and 25°C to maintain regulation within specification. Over temperature (0°C to 70°C), dropout increases to 45 mV, so VIN ≥ 4.141 V is recommended for full-range operation. Input below this threshold causes output collapse and loss of reference accuracy.
Does LM4140ACMX-4.1/NOPB require an output capacitor, and what type is recommended?
Yes, LM4140ACMX-4.1/NOPB requires a 1-µF output capacitor 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. Aluminum electrolytics are discouraged due to ESR rise at low temperatures, risking instability below 0°C.
How does the enable pin function on LM4140ACMX-4.1/NOPB, and what are its voltage thresholds?
The enable pin (Pin 3) controls ON/OFF state: logic high (≥0.8×VIN) enables the reference; logic low (≤0.4 V) disables it, reducing supply current to ≤1 µA. During disable, internal circuitry actively discharges the output capacitor to ground. The pin must never float - tie to VIN if unused. Input leakage is ≤2 nA, allowing direct MCU GPIO control.
Can LM4140ACMX-4.1/NOPB drive a 10 kΩ load directly, and what is its load regulation performance?
Yes, LM4140ACMX-4.1/NOPB can drive a 10 kΩ load (409.6 µA) within specification. At 1–8 mA load, load regulation is 5–35 ppm/mA (typ.), translating to ≤0.28 mV error across full range. For 10 kΩ (0.41 mA), error is <0.15 mV - well within 0.1% initial accuracy. Output remains stable with proper 1-µF capacitor.
Is LM4140ACMX-4.1/NOPB pin-compatible with other members of the LM4140 family?
Yes, all LM4140 variants (e.g., LM4140AMX-2.5/NOPB, LM4140BMX-4.1/NOPB) share identical 8-pin SOIC (D) package, pinout, and footprint. Only output voltage and grade (A/B/C) differ - enabling design reuse across voltage options without PCB changes. A-grade parts (like LM4140ACMX-4.1/NOPB) offer 3 ppm/°C drift versus 6 ppm/°C for B-grade.
LM4140ACMX-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:
- 3ppm/°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
LM4140ACMX-4.1/NOPB FAQ
1.How can I place an order for LM4140ACMX-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140ACMX-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 LM4140ACMX-4.1/NOPB reliable?
The price and inventory of LM4140ACMX-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 LM4140ACMX-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140ACMX-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140ACMX-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140ACMX-4.1/NOPB?
LM4140ACMX-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140ACMX-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 LM4140ACMX-4.1/NOPB?
For technical support, including LM4140ACMX-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140ACMX-4.1/NOPB requirements.
6.How does Aetrix verify that LM4140ACMX-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140ACMX-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 LM4140ACMX-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140ACMX-4.1/NOPB?
All LM4140ACMX-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140ACMX-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 LM4140ACMX-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4140ACMX-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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