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Texas Instruments LM4140ACM-1.2/NOPB
- Part No.:
- LM4140ACM-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140ACM-1.2/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,543
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Product details
Overview
LM4140ACM-1.2/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 1.25 V output with ±0.1% initial accuracy, 3 ppm/°C temperature coefficient (A grade), and 20 mV typical dropout at 1 mA load. It features an enable pin for power management and operates down to 1.8 V input, making it ideal for precision ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4140ACM-1.2/NOPB datasheet, LM4140ACM-1.2/NOPB pinout, LM4140ACM-1.2/NOPB application, or LM4140ACM-1.2/NOPB equivalent, key selection criteria include initial accuracy, thermal drift, enable-controlled shutdown current (<1 µA), noise performance (2.2 µVPP, 0.1–10 Hz), and SOIC-8 package compatibility with 1-µF output capacitance requirements.
Technical Context
The LM4140ACM-1.2/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling sub-bandgap 1.25 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 intrinsic body diode.
It operates in two functional modes: normal regulation (EN = VIN) and shutdown (EN = GND), achieving full output recovery in <200 µs. The device requires a mandatory 1-µF output capacitor for loop stability and transient response, with ESR constraints validated for tantalum, ceramic, and aluminum electrolytic types.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25 V ±0.1% (initial accuracy at 25°C; enables 12-bit+ system calibration without trimming) |
| Temp Coefficient | 3 ppm/°C (A grade; ensures ≤225 ppm total drift across 0–70°C ambient range) |
| Dropout Voltage | 20 mV (typical at 1 mA; allows operation from 1.27 V supply, critical for single-cell Li-ion systems) |
| Output Noise | 2.2 µVPP (0.1–10 Hz; supports high-resolution SAR and delta-sigma ADCs without added filtering) |
| Supply Current | 230 µA (typical active; ≤1 µA in shutdown; extends battery life in sleep-mode data loggers) |
| Enable Threshold | VH = 0.8×VIN, VL = 0.4 V (TTL/CMOS-compatible control; eliminates need for level-shifting in microcontroller interfaces) |
| Load Drive | ±8 mA (sinks and sources; directly drives ADC reference inputs, op-amp bias networks, and small DACs) |
Pinout & Package
LM4140ACM-1.2/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not present; lead finish is NiPdAu (RoHS-compliant, Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Ground return paths; all four pins must be connected to PCB ground plane for thermal stability and noise immunity |
| 2 | VIN | Positive supply input; accepts 1.8 V to 5.5 V; requires local 0.1 µF bypass capacitor per layout guidelines |
| 3 | EN | Enable control input; logic-high (≥0.8×VIN) enables regulation; logic-low (≤0.4 V) disables output and reduces IQ to ≤1 µA |
| 5 | NC | No-connect terminal; must remain unconnected and unstubbed to avoid parasitic coupling |
| 6 | VREF | Regulated 1.25 V output; capable of sourcing/sinking up to 8 mA; requires 1 µF output capacitor to GND (Pin 1/4/7/8) for stability |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables factory-calibrated 3 ppm/°C drift and 0.1% initial accuracy without laser trimming-reducing cost and improving batch consistency |
| Ultra-low 1.25 V output | First sub-bandgap reference offering 1.25 V option; matches common ADC full-scale ranges (e.g., 1.25 V for 12-bit 5 VFS) without resistor dividers |
| Active output discharge | Internally discharges COUT to GND during shutdown-preventing holdover errors in multiplexed reference systems |
| Reverse current protection | P-channel pass transistor body diode blocks >50 mA reverse current from VREF to VIN, eliminating external protection diodes |
| Low-noise spectral density | 1.2 µV/√Hz @ 10 Hz (derived from 2.2 µVPP); enables direct interface with 24-bit delta-sigma converters without post-filtering |
Applications
| Portable Data Acquisition | Precision DAC Biasing |
|---|---|
Use Scenario: Battery-powered handheld multimeter acquiring 16-bit voltage measurements with auto-ranging. IC Role / Device Role / Timing Role: Primary voltage reference for internal 16-bit SAR ADC and autoranging attenuator calibration. Use Value: 3 ppm/°C drift and 2.2 µVPP noise ensure <±0.01% measurement error across 0–50°C operating range without recalibration. | Use Scenario: Industrial PLC analog output module generating 4–20 mA signals via 16-bit DAC. IC Role / Device Role / Timing Role: Stable 1.25 V reference for DAC's internal gain-setting network and offset correction. Use Value: ±0.1% initial accuracy and 230 µA supply current allow full-scale DAC linearity better than 0.02% while minimizing self-heating error. |
| Medical Sensor Signal Chain | Battery-Fueled IoT Node |
Use Scenario: Wearable ECG front-end amplifying microvolt-level biopotentials with 24-bit ADC digitization. IC Role / Device Role / Timing Role: Low-noise reference for ADC and programmable-gain amplifier (PGA) biasing. Use Value: 2.2 µVPP (0.1–10 Hz) noise floor preserves signal integrity below 1 µV RMS, enabling detection of P-wave morphology. | Use Scenario: Soil moisture sensor node powered by CR2032 coin cell, transmitting readings every 10 minutes. IC Role / Device Role / Timing Role: Enable-controlled reference for ADC and MCU internal voltage monitor during active sampling bursts. Use Value: ≤1 µA shutdown current and <200 µs wake-up time extend 10-year battery life while maintaining fast system responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5012IDR | 1.2 V output, 3 ppm/°C, 3.8 µVPP noise, 0.15 mA IQ; no enable pin; SOIC-8 | Higher noise and fixed 1.2 V output limit dynamic range flexibility vs. LM4140ACM-1.2/NOPB's 1.25 V | Select when ultra-low drift is prioritized over enable control and noise; verify 1.2 V compatibility with ADC full-scale |
| ADR3412ARJZ-R7 | 1.2 V output, 10 ppm/°C (B grade), 5.5 µVPP noise, 120 µA IQ; enable pin; SOT-23-6 | Higher drift and noise; smaller package limits thermal mass and long-term stability | Select for space-constrained designs where 10 ppm/°C drift and higher noise are acceptable trade-offs for footprint reduction |
Compared with REF5012IDR and ADR3412ARJZ-R7, LM4140ACM-1.2/NOPB uniquely combines 1.25 V output, 3 ppm/°C drift, 2.2 µVPP noise, and enable functionality in SOIC-8-making it optimal for portable, high-accuracy systems requiring both precision and power-state control.
Availability
LM4140ACM-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, medical sensor modules, and industrial data acquisition systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM4140ACM-1.2/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 digital signal processors for industrial, automotive, and consumer markets.
The LM4140 product line was developed to deliver sub-bandgap precision references with EEPROM-based trimming-targeting high-accuracy, low-power applications in portable test equipment and battery-operated sensors.
FAQ
What is the minimum input voltage required for stable operation of LM4140ACM-1.2/NOPB?
The LM4140ACM-1.2/NOPB requires a minimum input voltage of 1.27 V (VREF + 20 mV typical dropout) at 1 mA load and 25°C. Over temperature (0–70°C), the dropout increases to 45 mV, so VIN ≥ 1.295 V is recommended for guaranteed regulation. Operation below 1.8 V is supported but requires verification of line regulation performance per datasheet Section 6.5.
Does LM4140ACM-1.2/NOPB require an output capacitor, and what type is recommended?
Yes, LM4140ACM-1.2/NOPB mandates a 1-µF output capacitor between VREF (Pin 6) and GND (Pins 1/4/7/8) for loop stability and transient response. Solid tantalum capacitors (e.g., Kemet T491A105M010AS) are verified for optimal ESR; multilayer ceramics (≥0.2 µF) may be used if ESR meets Figure 23 limits. Aluminum electrolytics are discouraged below 0°C due to ESR rise.
How does the enable pin function on LM4140ACM-1.2/NOPB, and what happens to the output during shutdown?
The enable pin (Pin 3) controls LM4140ACM-1.2/NOPB's operational state: logic-high (≥0.8×VIN) enables regulation; logic-low (≤0.4 V) disables output and reduces supply current to ≤1 µA. During shutdown, internal circuitry actively discharges the output capacitor to GND, preventing voltage holdover that could corrupt downstream circuit states.
Can LM4140ACM-1.2/NOPB drive a 10 kΩ load directly, and what is its maximum output current capability?
Yes, LM4140ACM-1.2/NOPB can directly drive a 10 kΩ load (125 µA at 1.25 V) with negligible error-its load regulation is specified at 1–8 mA. The device sources/sinks up to ±8 mA (short-circuit current up to 35 mA), supporting direct interface with ADC reference inputs, op-amp bias networks, and small DACs without external buffers.
What is the thermal hysteresis specification for LM4140ACM-1.2/NOPB, and how does it impact long-term accuracy?
LM4140ACM-1.2/NOPB exhibits ≤20 ppm thermal hysteresis (change in 25°C output voltage after cycling between 0°C and 70°C). This represents a worst-case 0.25 µV shift in the 1.25 V output, contributing to total uncertainty alongside initial accuracy (±1.25 mV) and temperature drift (±225 ppm). For metrology-grade systems, hysteresis should be characterized during burn-in.
LM4140ACM-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- 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:
- 375µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM4140ACM-1.2/NOPB FAQ
1.How can I place an order for LM4140ACM-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140ACM-1.2/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 LM4140ACM-1.2/NOPB reliable?
The price and inventory of LM4140ACM-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4140ACM-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140ACM-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140ACM-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140ACM-1.2/NOPB?
LM4140ACM-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140ACM-1.2/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 LM4140ACM-1.2/NOPB?
For technical support, including LM4140ACM-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140ACM-1.2/NOPB requirements.
6.How does Aetrix verify that LM4140ACM-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140ACM-1.2/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 LM4140ACM-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140ACM-1.2/NOPB?
All LM4140ACM-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140ACM-1.2/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 LM4140ACM-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4140ACM-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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