My Inquiry
My Account
Texas Instruments LM4140BCM-2.0
- Part No.:
- LM4140BCM-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140BCM-2.0.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,866
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4140BCM-2.0 from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 2.048 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 used in precision DACs, data acquisition systems, and portable instrumentation where stable, low-drift references are critical.
For engineers reviewing the LM4140BCM-2.0 datasheet, LM4140BCM-2.0 pinout, LM4140BCM-2.0 application, or LM4140BCM-2.0 equivalent, key selection considerations include its 2.048 V output voltage, A-grade 3 ppm/°C TC, enable-controlled shutdown (≤1 µA), 230 µA operating supply current, and SOIC-8 package compatibility with 1 µF output capacitance requirement.
Technical Context
The LM4140BCM-2.0 uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling sub-bandgap 2.048 V output with higher resolution than conventional bandgap references. Its P-channel pass transistor architecture supports low dropout and reverse-current protection via inherent body diode.
It operates in two functional modes: normal regulation (EN = VIN) and shutdown (EN = GND), with VREF restored in <200 µs on enable assertion. 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 | 2.048 V ±0.1% initial accuracy - enables precise 12-bit full-scale scaling (e.g., 2.048 V = 1 LSB × 2¹¹) without external gain/offset calibration. |
| Temp Coefficient | 3 ppm/°C (A grade) - drift of ≤21 ppm over 0°C to 70°C ambient, supporting ±0.0025% system-level accuracy in industrial temperature ranges. |
| Dropout Voltage | 20 mV (typical) at 1 mA - allows operation with only 2.068 V input, critical for single-cell Li-ion (3.0–4.2 V) or coin-cell (2.0–3.6 V) powered systems. |
| Supply Current | 230 µA (typical) active / ≤1 µA shutdown - extends battery life in always-on sensor nodes and portable test equipment. |
| Output Noise | 2.2 µVPP (0.1 Hz to 10 Hz) - contributes <0.00011% RMS noise to 2.048 V output, preserving ENOB in 16-bit+ SAR ADCs. |
| Load Drive | ±8 mA output capability - directly drives ADC reference inputs, op-amp buffers, or small DACs without external amplification. |
| Enable Threshold | VH = 0.8×VIN, VL = 0.4 V - compatible with 1.8 V, 3.3 V, and 5 V logic families for flexible system-level control. |
Pinout & Package
LM4140BCM-2.0 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 by separating analog return paths from enable and input currents. |
| 2 | VIN | Positive supply input - accepts 1.8 V to 5.5 V; must be bypassed with ≥0.1 µF capacitor for noise immunity and transient response. |
| 3 | Enable | Digital control input - pulled high to VIN for regulation; driven low to GND for shutdown (≤1 µA IQ); must not float. |
| 5 | NC | No-connect terminal - electrically isolated and must remain unconnected to avoid parasitic coupling or latch-up risk. |
| 6 | VREF | Precision output - delivers 2.048 V with sourcing/sinking capability up to ±8 mA; requires 1 µF capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 0.1% initial accuracy and 3 ppm/°C TC without laser trimming - reduces unit cost and improves batch-to-batch consistency. |
| Sub-bandgap output | 2.048 V option is below silicon bandgap (~1.25 V), enabling direct match to 12-bit binary full-scale (2¹¹ = 2048) without resistor dividers. |
| Ultra-low 10 Hz noise | 2.2 µVPP integrated noise - avoids adding measurable error in high-resolution weigh scales and medical front-ends requiring DC stability. |
| Fast enable recovery | <200 µs VREF settling - supports burst-mode sampling in portable DMMs and energy-harvesting sensors with duty-cycled power rails. |
| Reverse current protection | Internal P-channel body diode blocks >50 mA reverse current from VREF to VIN - prevents damage during hot-swap or output overvoltage events. |
Applications
| Portable Instrumentation | Precision Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 5½-digit resolution operating from single 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Primary voltage reference for 22-bit ΣΔ ADC, providing stable 2.048 V scale with minimal thermal drift during field use. Use Value: Enables guaranteed 0.002% measurement accuracy over 0°C–50°C without recalibration, leveraging 3 ppm/°C TC and 20 mV dropout to sustain operation down to 2.5 V battery voltage. | Use Scenario: Industrial PLC analog input module acquiring 16-channel thermocouple and RTD signals. IC Role / Device Role / Timing Role: Shared reference for multiplexed 24-bit ADC and programmable gain amplifier, synchronized to system clock for correlated sampling. Use Value: Eliminates channel-to-channel gain mismatch caused by reference drift; 2.2 µVPP noise ensures <1 LSB error in 24-bit conversion at 10 SPS. |
| Battery-Powered Medical Sensors | Automotive Cabin Monitoring |
Use Scenario: Wearable ECG patch with ultra-low-power MCU and analog front-end running 7 days on CR2032 coin cell. IC Role / Device Role / Timing Role: Reference for ultra-low-noise instrumentation amplifier and SAR ADC, enabled only during 10 ms sampling bursts. Use Value: 230 µA active / ≤1 µA shutdown current extends battery life; fast 200 µs wake-up enables precise timing-aligned sampling without reference warm-up delay. | Use Scenario: Occupant detection system using capacitive sensing and micro-power MCU in automotive cabin. IC Role / Device Role / Timing Role: Stable bias reference for capacitive delta-sigma modulator, operating across –40°C to +85°C under engine-off conditions. Use Value: A-grade 3 ppm/°C TC ensures <±0.015% reference error over full automotive temperature range, meeting ISO 16750-4 cold-cranking requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5020IDR | 2.048 V, 3 ppm/°C, 3.8 µVPP noise, 0.1% initial accuracy, SOIC-8 - lower noise but higher quiescent current (950 µA). | Preferred in metrology-grade lab equipment where noise dominates; less suitable for battery life–constrained designs. | Select REF5020IDR when 0.1 µVPP noise reduction justifies 4× higher supply current and larger PCB footprint. |
| ADR4520BRZ | 2.048 V, 3 ppm/°C, 1.75 µVPP noise, 0.05% initial accuracy, SOIC-8 - tighter initial tolerance but requires ≥2.3 V input (higher dropout). | Better for factory-calibrated systems needing zero-factory-adjustment; unsuitable for 1.8 V–2.2 V input rails. | Choose ADR4520BRZ when absolute initial accuracy outweighs low-voltage operation - e.g., automated test equipment with post-manufacture calibration. |
Compared with REF5020IDR and ADR4520BRZ, LM4140BCM-2.0 uniquely balances ultra-low dropout (20 mV), sub-1 µA shutdown, and 2.2 µVPP noise in a cost-optimized SOIC-8 - making it optimal for portable, battery-powered precision systems where input voltage headroom and standby power are primary constraints.
Availability
LM4140BCM-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, and battery-powered medical sensors requiring stable component supply, long-term parametric consistency, and qualified automotive-grade alternatives.
Supply support for LM4140BCM-2.0 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 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 high-accuracy, low-drift voltage references with EEPROM-based trimming for cost-sensitive portable and instrumentation applications - specifically targeting sub-bandgap outputs and ultra-low dropout operation.
FAQ
What is the minimum input voltage required for stable operation of the LM4140BCM-2.0?
The LM4140BCM-2.0 requires a minimum input voltage of VREF + 20 mV (i.e., 2.068 V) for stable regulation at 1 mA load, per its 20 mV typical dropout specification. At full temperature range (0°C to 70°C), dropout rises to 45 mV, so 2.093 V is recommended for guaranteed operation. Input below 1.8 V is not supported.
Does the LM4140BCM-2.0 require an output capacitor, and what type is recommended?
Yes, the LM4140BCM-2.0 mandates a 1 µF output capacitor for loop stability and transient response. Solid tantalum (e.g., Kemet T491A105M010AS) is verified for optimal performance; multilayer ceramic capacitors are usable if ESR meets TI's specified range (≥0.1 Ω) and capacitance remains ≥0.2 µF over temperature.
How does the enable pin function on the LM4140BCM-2.0, and what are its voltage thresholds?
The LM4140BCM-2.0 enable pin asserts normal operation when pulled to VIN (logic high), and enters shutdown (<1 µA IQ) when pulled to GND (logic low). Valid thresholds are VH ≥ 0.8×VIN and VL ≤ 0.4 V, ensuring compatibility with 1.8 V, 3.3 V, and 5 V logic families. The pin must never be left floating.
What is the output noise performance of the LM4140BCM-2.0, and how does it scale with output voltage?
The LM4140BCM-2.0 delivers 2.2 µVPP (0.1 Hz to 10 Hz) output noise for the 1.024 V version. Since noise scales linearly with VREF, the 2.048 V variant exhibits ~4.4 µVPP noise - still among the lowest in its class and sufficient for 16-bit+ precision systems without additional filtering.
Can the LM4140BCM-2.0 drive a 10 kΩ load directly, and what is its maximum output current capability?
Yes, the LM4140BCM-2.0 can drive a 10 kΩ load (205 µA at 2.048 V) directly, well within its ±8 mA sourcing/sinking capability. Its load regulation is specified at 1–8 mA, with worst-case drift of 150 ppm/mA over temperature - resulting in only 0.015% error at full 8 mA, making it suitable for driving ADC references and op-amp inputs without buffering.
LM4140BCM-2.0 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):
- 2.048V
- 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-2.0 FAQ
1.How can I place an order for LM4140BCM-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140BCM-2.0 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-2.0 reliable?
The price and inventory of LM4140BCM-2.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4140BCM-2.0 is usually 5 days.
3.What payment methods are accepted for LM4140BCM-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140BCM-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140BCM-2.0?
LM4140BCM-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140BCM-2.0 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-2.0?
For technical support, including LM4140BCM-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140BCM-2.0 requirements.
6.How does Aetrix verify that LM4140BCM-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4140BCM-2.0 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-2.0 meets industry standards.
7.What is the process for return or replacement of LM4140BCM-2.0?
All LM4140BCM-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4140BCM-2.0, 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-2.0 part is unused and in its original packaging.
Return procedure for LM4140BCM-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4140BCM-2.0 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
