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Texas Instruments LM4140BCM-1.0
- Part No.:
- LM4140BCM-1.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140BCM-1.0.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,477
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Product details
Overview
LM4140BCM-1.0 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 datasheet, LM4140BCM-1.0 pinout, LM4140BCM-1.0 application, or LM4140BCM-1.0 equivalent, key selection considerations include dropout voltage at 1 mA (20 mV typ), thermal hysteresis (20 ppm), long-term stability (60 ppm/1000 h), and mandatory 1-µF output capacitor for loop stability.
Technical Context
The LM4140BCM-1.0 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 pass transistor architecture supports ultra-low dropout (20 mV at 1 mA) and reverse-current protection via inherent body diode.
Enable functionality provides fast turn-on (<200 µs) and active discharge of the output capacitor during shutdown. The device requires no input capacitor but mandates a 1-µF output capacitor with specified ESR range for stability across 0°C to 70°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.024 V ±0.1% - enables precise 10-bit full-scale scaling (e.g., 1 mV/LSB with 1024-step DAC) |
| Tempco (A Grade) | 3 ppm/°C - ensures ≤21 ppm drift over 0°C to 70°C ambient, critical for lab-grade measurement systems |
| Noise (0.1–10 Hz) | 2.2 µVPP - supports 16+ ENOB in precision SAR ADCs without external filtering |
| Dropout Voltage | 20 mV (typ) at 1 mA - allows operation from single-cell Li-ion (3.0 V min) with ≥2.048 V headroom margin |
| Supply Current | 230 µA (typ) active / ≤1 µA shutdown - extends battery life in always-on sensor nodes |
| Load Drive | 8 mA max - directly powers ADC reference inputs, op-amp bias networks, or small DACs |
| Enable Threshold | VH = 0.8×VIN, VL = 0.4 V - compatible with 1.8-V and 3.3-V logic without level shifters |
Pinout & Package
LM4140BCM-1.0 is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm) 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 bounce and improve PSRR by separating analog return paths |
| 2 | VIN | Positive supply input - accepts 1.8 V to 5.5 V; internal P-channel pass transistor sets dropout behavior |
| 3 | Enable | Digital control input - pulled high to VIN for operation; grounded to disable output and discharge COUT |
| 5 | NC | No-connect terminal - must remain unconnected per datasheet; no internal connection or function |
| 6 | VREF | Precision output - delivers 1.024 V with sourcing capability up to 8 mA; requires 1-µF ceramic/tantalum capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 1.024 V output below bandgap voltage with 3 ppm/°C tempco - eliminates need for external calibration |
| Active output discharge | Internal circuitry drains COUT to GND during shutdown - prevents floating reference and ensures deterministic power-down state |
| Low-noise architecture | 2.2 µVPP (0.1–10 Hz) - achieves <0.001% peak-to-peak error in 12-bit+ data acquisition over 10-second intervals |
| Ultra-low dropout | 20 mV at 1 mA - supports rail-to-rail operation from 1.8-V supplies, critical for energy-harvesting systems |
| Shutdown current | ≤1 µA - reduces system standby power by >99% vs active mode, enabling multi-year battery life |
Applications
| Portable Instrumentation | Precision Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 5½-digit resolution requiring stable reference under varying battery voltage and temperature. IC Role / Device Role / Timing Role: Primary voltage reference for dual-slope ADC and front-end gain calibration. Use Value: 3 ppm/°C tempco and 2.2 µVPP noise ensure <±0.005% reading accuracy across 0–70°C without firmware compensation. | Use Scenario: Industrial PLC analog input module digitizing 4–20 mA sensor signals with 16-bit resolution. IC Role / Device Role / Timing Role: Reference source for simultaneous-sampling SAR ADCs and programmable gain amplifier offset trim. Use Value: 8 mA drive capability powers multiple ADC references and PGA bias networks from single LM4140BCM-1.0, reducing BOM count. |
| Battery-Powered Medical Sensors | Automotive Cabin Monitoring |
Use Scenario: Wearable ECG patch operating from coin cell, requiring ultra-low quiescent current and low-noise signal chain. IC Role / Device Role / Timing Role: Reference for low-power delta-sigma ADC and analog front-end amplifiers. Use Value: ≤1 µA shutdown current extends 3-V CR2032 battery life beyond 2 years in sleep mode; 1.024 V output matches common 10-bit microcontroller ADC full-scale. | Use Scenario: Occupant detection system using capacitive sensing with precision threshold generation. IC Role / Device Role / Timing Role: Stable reference for comparator hysteresis and ADC monitoring of seat occupancy signals. Use Value: ±0.1% initial accuracy and 20 ppm thermal hysteresis prevent false triggers across automotive temperature cycles (-40°C to 85°C ambient). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3012AIDBZR | 1.2 V output, 50-ppm/°C max tempco, no enable pin, 50 µA supply current | Lacks shutdown control and lower noise (3.8 µVPP); suited for always-on, low-power apps where 1.2 V suffices | Select when board space is constrained (SOT-23-3) and enable functionality is unnecessary |
| ADR3410ARJZ-R7 | 1.0 V output, 10 ppm/°C max tempco, enable pin, 120 µA supply current, 10 µVPP noise | Higher noise and looser initial accuracy (±0.12%) but superior PSRR (80 dB vs 60 dB) | Prefer in noisy environments (e.g., motor drives) where PSRR outweighs noise sensitivity |
Compared with REF3012AIDBZR and ADR3410ARJZ-R7, the LM4140BCM-1.0 uniquely combines sub-bandgap 1.024 V output, 3 ppm/°C tempco, and 2.2 µVPP noise - making it optimal for portable, high-resolution measurement where supply headroom and low-frequency noise are limiting factors.
Availability
LM4140BCM-1.0 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, long-lifecycle support, and traceable sourcing.
Supply support for LM4140BCM-1.0 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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs since 1930.
The LM4140 product line was engineered to deliver sub-bandgap reference voltages with EEPROM-based trimming - targeting high-accuracy, low-power applications in portable test equipment and industrial sensing.
FAQ
What is the minimum input voltage required for stable operation of the LM4140BCM-1.0?
The LM4140BCM-1.0 requires a minimum input voltage of 1.8 V, which is VREF + 0.776 V. At 25°C and 1 mA load, dropout is only 20 mV, so 1.044 V headroom suffices - but TI specifies 1.8 V as the absolute minimum to guarantee performance across temperature and process variation. Operation below 1.8 V risks loss of regulation and increased noise.
Does the LM4140BCM-1.0 require an external output capacitor, and why?
Yes, the LM4140BCM-1.0 requires a 1-µF capacitor between VREF and GND for loop stability and transient response. This capacitor compensates the internal feedback network; omitting it causes oscillation or excessive ringing during load steps. TI validates stability with tantalum and ceramic types meeting specified ESR ranges - multilayer ceramics may need series resistance if ESR falls below 0.1 Ω.
How does the enable pin function on the LM4140BCM-1.0, and what happens to the output during shutdown?
The enable pin on the LM4140BCM-1.0 is active-high: driving it to ≥0.8×VIN enables regulation, while pulling it ≤0.4 V disables output. During shutdown, the LM4140BCM-1.0 actively discharges the output capacitor to GND through internal circuitry - preventing floating voltage and ensuring predictable power-down behavior essential for sequenced systems.
What is the maximum load current the LM4140BCM-1.0 can drive while maintaining specification?
The LM4140BCM-1.0 is specified to drive up to 8 mA while maintaining ±0.1% output accuracy and 3 ppm/°C tempco over 0°C to 70°C. At 8 mA, dropout rises to 235 mV (max) and load regulation degrades to 150 ppm/mA. For designs requiring >8 mA, TI recommends using an external buffer amplifier or the boosted-output-current topology shown in Figure 30 of the datasheet.
Can the LM4140BCM-1.0 be used in automotive applications, and what qualifications support this?
The LM4140BCM-1.0 is rated for 0°C to 70°C operation and is not AEC-Q200 qualified. While it appears in automotive cabin monitoring designs per TI's application notes, TI does not guarantee performance beyond its specified temperature range. For under-hood or safety-critical automotive use, designers must perform full qualification testing and consider alternatives like the AEC-Q200–qualified REF5010AIY.
LM4140BCM-1.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM4140BCM-1.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140BCM-1.0 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 reliable?
The price and inventory of LM4140BCM-1.0 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 is usually 5 days.
3.What payment methods are accepted for LM4140BCM-1.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140BCM-1.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140BCM-1.0?
LM4140BCM-1.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140BCM-1.0 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?
For technical support, including LM4140BCM-1.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140BCM-1.0 requirements.
6.How does Aetrix verify that LM4140BCM-1.0 is sourced from the original manufacturer or authorized distributors?
All LM4140BCM-1.0 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 meets industry standards.
7.What is the process for return or replacement of LM4140BCM-1.0?
All LM4140BCM-1.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4140BCM-1.0, 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 part is unused and in its original packaging.
Return procedure for LM4140BCM-1.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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