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Texas Instruments LM4140BCM-1.0/NOPB
- Part No.:
- LM4140BCM-1.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140BCM-1.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,141
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Product details
Overview
LM4140BCM-1.0/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 1.024 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, features an enable pin for shutdown (≤1 µA quiescent current), and drives up to 8 mA - ideal for precision ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4140BCM-1.0/NOPB datasheet, LM4140BCM-1.0/NOPB pinout, LM4140BCM-1.0/NOPB application, or LM4140BCM-1.0/NOPB equivalent, key selection criteria include dropout voltage at 1 mA (20 mV typ), thermal hysteresis (20 ppm), long-term stability (60 ppm/1000 h), load regulation (1–20 ppm/mA), and required 1-µF output capacitor for stability.
Technical Context
The LM4140BCM-1.0/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming - enabling sub-bandgap 1.024 V output with industry-leading 3 ppm/°C drift (A grade). Its P-channel series pass architecture supports operation with VIN as low as VREF + 400 mV over temperature.
Enable functionality provides fast turn-on (<200 µs) and active discharge of the output capacitor during shutdown. The device requires a minimum 1-µF output capacitor with specified ESR range for loop stability and transient response, and tolerates reverse current up to 50 mA via the inherent pass transistor body diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.024 V ±0.1% (initial accuracy at 25°C) |
| Temp Coefficient | 3 ppm/°C (A grade, 0°C to 70°C) - enables <±0.21 mV drift over full range |
| Dropout Voltage | 20 mV (typical at 1 mA, 25°C) - allows operation with VIN ≥ 1.044 V |
| Output Noise | 2.2 µVPP (0.1–10 Hz) - critical for 16-bit+ SAR and delta-sigma ADC reference performance |
| Supply Current | 230 µA (typical active), ≤1 µA (shutdown) - extends battery life in portable systems |
| Load Drive | Up to 8 mA source capability - sufficient for driving ADC references and op-amp inputs directly |
| Enable Logic | Active-high EN pin; VIH = 0.8×VIN, VIL = 0.4 V - compatible with 1.8-V and 3.3-V logic |
Pinout & Package
LM4140BCM-1.0/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not electrically connected. Pin 5 is NC (no connect); pins 1, 4, 7, and 8 are ground terminals for low-impedance return paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Four dedicated ground connections minimize ground bounce and improve PSRR |
| 2 | VIN | Positive supply input; accepts 1.8 V to 5.5 V; requires bypass capacitor for stability |
| 3 | EN | Enable control; pull high for normal operation, low for shutdown (≤1 µA IQ) |
| 5 | NC | No internal connection; must be left unconnected per datasheet |
| 6 | VREF | 1.024 V precision output; capable of sourcing up to 8 mA; requires 1-µF output capacitor |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 1.024 V output below bandgap voltage with 3 ppm/°C TC and ±0.1% accuracy |
| Ultra-low noise | 2.2 µVPP (0.1–10 Hz) - supports 18-bit+ resolution in precision data acquisition |
| Low dropout | 20 mV at 1 mA - permits use with single-cell Li-ion (3.0 V min) or coin-cell (1.8 V min) supplies |
| Active output discharge | Internal circuitry discharges COUT to GND during shutdown - prevents holdover voltage in sequencing systems |
| Multiple ground pins | Four GND pins reduce thermal resistance and improve PSRR by lowering ground path impedance |
Applications
| Portable Instrumentation | Precision Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter or portable DMM requiring stable, battery-efficient reference for 16-bit ADC. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC conversion core and internal DAC calibration. Use Value: 1.024 V output matches common 2n full-scale ranges; 230 µA supply current extends runtime on CR2032 cells. | Use Scenario: Industrial sensor node digitizing strain gauge or RTD outputs with 100 kSPS sampling. IC Role / Device Role / Timing Role: Low-noise, low-drift reference for sigma-delta ADC front-end and programmable gain amplifier biasing. Use Value: 2.2 µVPP noise and 20 ppm thermal hysteresis ensure <±0.005% measurement repeatability across temperature cycles. |
| Medical Vital Signs Monitoring | Battery-Powered Test Equipment |
Use Scenario: Wearable ECG monitor needing ultra-low-power, high-accuracy reference for analog front-end. IC Role / Device Role / Timing Role: Reference source for instrumentation amplifiers and anti-aliasing filters in biopotential signal chain. Use Value: Shutdown current ≤1 µA enables deep-sleep modes; 3 ppm/°C TC meets IEC 60601-1 accuracy requirements. | Use Scenario: Benchtop calibrator or portable oscilloscope probe compensator requiring traceable voltage standard. IC Role / Device Role / Timing Role: Stable 1.024 V reference for DAC-based waveform generation and self-test calibration routines. Use Value: ±0.1% initial accuracy and 60 ppm/1000 h long-term stability support metrology-grade verification without frequent recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3012AIDBZR | 1.2 V output, 50 ppm/°C TC (B grade), 3.3 µVPP noise, no enable pin, SOT-23-3 package | Lacks shutdown control and has higher noise/drift; limited to space-constrained designs where enable is unnecessary | Choose when board area is critical and 1.2 V output suffices; avoid if 1.024 V matching or low-noise performance is required |
| ADR3410ARJZ-R7 | 1.0 V output, 10 ppm/°C TC (B grade), 4.5 µVPP noise, enable pin, SOT-23-6 package | Lower output voltage (1.0 V vs 1.024 V), higher noise and drift, smaller package with fewer ground pins | Acceptable for cost-sensitive applications where 1.0 V is acceptable and 3 ppm/°C stability is not mandatory |
Compared with REF3012AIDBZR and ADR3410ARJZ-R7, LM4140BCM-1.0/NOPB delivers superior initial accuracy (±0.1% vs ±0.2%), lower noise (2.2 µVPP vs ≥3.3 µVPP), tighter TC (3 ppm/°C vs ≥5 ppm/°C), and four ground pins for improved PSRR - making it optimal for high-resolution, battery-operated measurement systems.
Availability
LM4140BCM-1.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, and medical vital signs monitoring requiring stable component supply, long-term calibration integrity, and low-power operation.
Supply support for LM4140BCM-1.0/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 solutions for industrial, automotive, and consumer markets.
The LM4140 product line was developed to deliver sub-bandgap precision voltage references with EEPROM-based trimming for ultra-low drift and noise - targeting high-resolution data converters, portable test equipment, and safety-critical sensor interfaces.
FAQ
What is the recommended output capacitor value for LM4140BCM-1.0/NOPB?
The LM4140BCM-1.0/NOPB requires a 1-µF ceramic or tantalum capacitor between VREF and GND for loop stability and transient response. Values as low as 0.2 µF may work over temperature but risk instability; TI specifies 1 µF as nominal. ESR must fall within the range shown in Figure 23 of the datasheet - typically 0.1 Ω to 10 Ω for 1-µF capacitors.
Does LM4140BCM-1.0/NOPB support reverse current protection?
LM4140BCM-1.0/NOPB does not include reverse current protection circuitry. Its internal P-channel pass transistor has a body diode from VIN to VREF, allowing up to 50 mA reverse current if VREF exceeds VIN or VIN drops below the output capacitor voltage. This condition is non-destructive but must be managed in system-level design to prevent unintended discharge paths.
Can LM4140BCM-1.0/NOPB operate from a 1.8-V supply?
Yes, LM4140BCM-1.0/NOPB is fully specified to operate from 1.8 V to 5.5 V input. At 1.8 V, it maintains 1.024 V output with 20 mV typical dropout (VIN – VREF), enabling direct use with single-cell Li-ion or alkaline batteries. Performance parameters including TC and noise remain valid across this input range per the Recommended Operating Conditions table.
What is the thermal hysteresis specification for LM4140BCM-1.0/NOPB?
The LM4140BCM-1.0/NOPB exhibits 20 ppm thermal hysteresis - defined as the change in 25°C output voltage before and after cycling between 0°C and 70°C. This parameter reflects mechanical stress memory in the package and is measured per Figure 26 in the datasheet. It contributes directly to total system error budget in applications requiring repeated thermal cycling.
How does the enable pin function on LM4140BCM-1.0/NOPB?
The enable pin (Pin 3) on LM4140BCM-1.0/NOPB is active-high: driving it to ≥0.8×VIN enables normal operation; pulling it ≤0.4 V disables the output and reduces supply current to ≤1 µA. During disable, the output is actively discharged to GND. The pin must never be left floating and should be tied to VIN if unused.
LM4140BCM-1.0/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):
- 1.024V
- 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:
- 375µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM4140BCM-1.0/NOPB FAQ
1.How can I place an order for LM4140BCM-1.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140BCM-1.0/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 LM4140BCM-1.0/NOPB reliable?
The price and inventory of LM4140BCM-1.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4140BCM-1.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140BCM-1.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140BCM-1.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140BCM-1.0/NOPB?
LM4140BCM-1.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140BCM-1.0/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 LM4140BCM-1.0/NOPB?
For technical support, including LM4140BCM-1.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140BCM-1.0/NOPB requirements.
6.How does Aetrix verify that LM4140BCM-1.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140BCM-1.0/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 LM4140BCM-1.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140BCM-1.0/NOPB?
All LM4140BCM-1.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140BCM-1.0/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 LM4140BCM-1.0/NOPB part is unused and in its original packaging.
Return procedure for LM4140BCM-1.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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