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Texas Instruments LM4140ACMX-4.1
- Part No.:
- LM4140ACMX-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140ACMX-4.1.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,704
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Product details
Overview
LM4140ACMX-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, 3 ppm/°C temperature coefficient (A grade), and 20 mV typical dropout at 1 mA. It features an enable pin for power management, operates down to 1.8 V input, and is optimized for precision data acquisition and battery-powered instrumentation.
For engineers reviewing the LM4140ACMX-4.1 datasheet, LM4140ACMX-4.1 pinout, LM4140ACMX-4.1 application, or LM4140ACMX-4.1 equivalent, key selection considerations include its ultra-low 2.2 µVPP (0.1–10 Hz) noise, 230 µA typical supply current, 1 µF required output capacitance, and SOIC-8 package compatibility with precision DAC and ADC reference designs.
Technical Context
The LM4140ACMX-4.1 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 supports low dropout and reverse-current protection via an internal VIN–VREF diode.
It operates in two functional modes: normal regulation (EN = VIN) and shutdown (EN = GND), achieving <200 µs turn-on time and ≤1 µA disable current. The device requires a 1 µF output capacitor for loop stability and transient response, with ESR constraints validated for tantalum, ceramic, and electrolytic types.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.1% - enables precise 12-bit full-scale DAC/ADC alignment without external scaling |
| Temp Coefficient | 3 ppm/°C (A grade) - ensures ≤0.87 mV drift over 0–70°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 systems |
| Output Noise | 2.2 µVPP (0.1–10 Hz) - minimizes quantization error in high-resolution 16+ bit data converters |
| Supply Current | 265 µA (typ, 4.096 V option) - balances low-power operation with fast settling and drive capability |
| Enable Threshold | VH = 0.8×VIN, VL = 0.4 V - compatible with standard 3.3 V or 5 V logic without level-shifting |
| Output Drive | ±8 mA - supports direct driving of SAR ADC reference inputs and op-amp buffers |
Pinout & Package
LM4140ACMX-4.1 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 supply input - accepts 1.8 V to 5.5 V; must be ≥ VREF + 20 mV for regulation |
| 3 | Enable | Digital control input - high = active, low = shutdown; must not float; drives internal P-MOSFET gate |
| 5 | NC | No-connect terminal - electrically isolated; must remain unconnected per datasheet |
| 6 | VREF | Precision output - delivers 4.096 V; requires 1 µF capacitor to GND for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 3 ppm/°C tempco and 0.1% initial accuracy without laser trimming - improves production yield and long-term stability |
| Low-noise architecture | 2.2 µVPP (0.1–10 Hz) - eliminates need for external noise filtering in metrology-grade applications |
| Active output discharge | Internal circuitry discharges COUT to GND during shutdown - prevents voltage hold-up and ensures clean system reset |
| Reverse current protection | Integrated P-channel pass transistor body diode limits reverse current to <50 mA - protects against back-driving from downstream circuits |
| Wide supply range | Operates from 1.8 V (for 1.024/1.25 V options) up to 5.5 V - supports mixed-voltage systems and brown-out resilience |
Applications
| Portable Instrumentation | Precision Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter or portable DMM requiring stable reference under varying battery voltage and temperature. IC Role / Device Role / Timing Role: Primary voltage reference for 16-bit SAR ADC and auto-ranging front-end. Use Value: 4.096 V output aligns directly with 212 = 4096 LSB scaling; 3 ppm/°C drift ensures <1 LSB error across 0–70°C. | Use Scenario: Industrial PLC analog input module digitizing 4–20 mA sensor signals with 0.05% total accuracy. IC Role / Device Role / Timing Role: Master reference for multiplexed 24-bit delta-sigma ADC and calibration DAC. Use Value: 2.2 µVPP noise contributes <0.01% of full-scale noise floor; 230 µA supply current enables low-power standby modes. |
| Battery-Powered Medical Sensors | Automotive Cabin Monitoring |
Use Scenario: Wearable ECG patch with single-cell Li-ion supply and ultra-low quiescent current budget. IC Role / Device Role / Timing Role: Reference for low-noise instrumentation amplifier and ADC signal chain. Use Value: 20 mV dropout enables regulation until battery drops to 4.116 V; ≤1 µA shutdown current extends shelf life. | Use Scenario: Occupant detection system using capacitive sensing and precision voltage thresholds. IC Role / Device Role / Timing Role: Stable bias reference for comparator hysteresis and ADC monitoring of seat sensors. Use Value: ±0.1% initial accuracy ensures consistent trip-point calibration across production units; AEC-Q200-compatible SOIC package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5040AIDR | 4.096 V, 3 ppm/°C, 0.05% initial accuracy; higher 3.8 µVPP noise; 0.95 mA supply current | Higher power, better absolute accuracy, but less suitable for battery-constrained designs | Choose REF5040AIDR when long-term drift (<10 ppm/1000 hrs) and tighter initial tolerance outweigh low-noise/low-IQ needs |
| ADR444BRZ | 4.096 V, 3 ppm/°C, 0.04% initial accuracy; 1.8 µVPP noise; no enable pin; 4.5 mA supply current | Superior noise performance but lacks shutdown mode and consumes >17× more current | Choose ADR444BRZ only for mains-powered, ultra-low-noise lab equipment where enable functionality is unnecessary |
Compared with REF5040AIDR and ADR444BRZ, LM4140ACMX-4.1 uniquely balances ultra-low noise (2.2 µVPP), micropower operation (265 µA), and integrated enable control - making it the optimal choice for portable, battery-aware precision systems where dynamic power gating is essential.
Availability
LM4140ACMX-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, battery-powered medical sensors, and automotive cabin monitoring requiring stable component supply across extended production lifecycles.
Supply support for LM4140ACMX-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, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer applications.
The LM4140 product line was designed specifically to deliver sub-bandgap precision references with EEPROM-based trimming for high-accuracy, low-drift, low-power applications in portable and battery-operated systems.
FAQ
What is the required output capacitor for stable operation of the LM4140ACMX-4.1?
The LM4140ACMX-4.1 requires a minimum 1 µF capacitor between VREF and GND for loop stability and transient response. This capacitor must meet specified ESR ranges-verified for solid tantalum (e.g., Kemet T491A105M010AS), ceramic (e.g., Murata GRM42-6Y5V225Z16), and aluminum electrolytic types. Using less than 0.2 µF risks oscillation or poor load step recovery. The LM4140ACMX-4.1 datasheet specifies exact ESR windows per capacitor type in Figures 22–24.
Does the LM4140ACMX-4.1 support reverse current protection, and how does it behave if VREF is forced above VIN?
Yes, the LM4140ACMX-4.1 includes reverse current protection via the inherent body diode of its internal P-channel pass transistor. If VREF is driven above VIN-or if VIN drops below the voltage stored on the output capacitor by more than ~0.7 V-the diode becomes forward-biased, allowing current flow from VREF to VIN. The LM4140ACMX-4.1 tolerates up to 50 mA reverse current without damage, provided thermal limits are observed. This behavior is explicitly documented in Section 8.1.6 of the LM4140ACMX-4.1 datasheet.
What is the maximum load current the LM4140ACMX-4.1 can source or sink, and how does dropout voltage scale with load?
The LM4140ACMX-4.1 is rated to source up to 8 mA continuously. Dropout voltage increases with load: at 1 mA it is 20 mV (typ), rising to 195 mV (typ) at 8 mA for the 4.096 V version. At 8 mA and 25°C, dropout reaches 270 mV (max). Load regulation is specified as 5–35 ppm/mA depending on temperature and load range. Exceeding 8 mA risks output droop or thermal shutdown; for higher currents, TI recommends using the LM4140ACMX-4.1 to drive an external buffer transistor as shown in Figure 30 of the LM4140ACMX-4.1 datasheet.
How does the enable pin of the LM4140ACMX-4.1 function, and what are the valid logic thresholds?
The enable pin (Pin 3) controls on/off operation: pulled high to VIN for normal regulation, pulled low to GND for shutdown. Valid thresholds are VH ≥ 0.8×VIN (logic high) and VL ≤ 0.4 V (logic low), with leakage current <2 nA. During shutdown, supply current drops to ≤1 µA and VREF discharges actively to GND via internal circuitry in <100 µs. The LM4140ACMX-4.1 must never have the enable pin left floating-it must be tied to VIN or GND through a robust connection.
Is the LM4140ACMX-4.1 qualified for automotive applications, and what temperature range is it specified over?
The LM4140ACMX-4.1 is specified for operation from 0°C to 70°C ambient temperature and is not AEC-Q200 qualified. While used in some automotive cabin monitoring systems, TI does not guarantee performance beyond this commercial temperature range. For extended temperature applications (–40°C to +125°C), TI recommends alternatives such as the REF5040QDRQ1 (automotive-grade, –40°C to +125°C, 4.096 V). The LM4140ACMX-4.1 datasheet explicitly states its operating range in Section 6.3 (Recommended Operating Conditions).
LM4140ACMX-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:
- 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 FAQ
1.How can I place an order for LM4140ACMX-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140ACMX-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 LM4140ACMX-4.1 reliable?
The price and inventory of LM4140ACMX-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 LM4140ACMX-4.1 is usually 5 days.
3.What payment methods are accepted for LM4140ACMX-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140ACMX-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140ACMX-4.1?
LM4140ACMX-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140ACMX-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 LM4140ACMX-4.1?
For technical support, including LM4140ACMX-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140ACMX-4.1 requirements.
6.How does Aetrix verify that LM4140ACMX-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4140ACMX-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 LM4140ACMX-4.1 meets industry standards.
7.What is the process for return or replacement of LM4140ACMX-4.1?
All LM4140ACMX-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4140ACMX-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 LM4140ACMX-4.1 part is unused and in its original packaging.
Return procedure for LM4140ACMX-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4140ACMX-4.1 Tags
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