My Inquiry
My Account
Texas Instruments LM4140ACM-2.0
- Part No.:
- LM4140ACM-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140ACM-2.0.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,939
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4140ACM-2.0 from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference with 2.048 V nominal output, 0.1% initial accuracy, 3 ppm/°C temperature coefficient (A grade), 20 mV typical dropout at 1 mA, and enable-controlled shutdown consuming ≤1 µA. It serves as a stable excitation source in precision data acquisition systems requiring sub-ppm stability over temperature.
For engineers reviewing the LM4140ACM-2.0 datasheet, LM4140ACM-2.0 pinout, LM4140ACM-2.0 application, or LM4140ACM-2.0 equivalent, key selection criteria include output voltage tolerance, thermal drift performance, enable logic compatibility, dropout behavior under load, and required 1 µF output capacitance for loop stability.
Technical Context
The LM4140ACM-2.0 uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling 3 ppm/°C drift without laser trimming. Its P-channel pass transistor architecture supports operation down to VIN = VREF + 20 mV (typical) at 1 mA, with fast turn-on (<200 µs) and internal output capacitor discharge during disable.
It operates across 0°C to 70°C, requires mandatory 1 µF output capacitor for stability, and features logic-compatible enable input (VIH = 0.8×VIN, VIL = 0.4 V) with <2 nA input current. Supply current is 230 µA (typ) in active mode and drops to 0.01 µA (typ) in shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V ±0.1% (2.046–2.050 V at 25°C); enables precise 12-bit full-scale scaling in ADC/DAC systems. |
| Temp Coefficient | 3 ppm/°C (A grade); ensures ≤0.43 mV drift over 0°C–70°C ambient range-critical for metrology-grade instruments. |
| Dropout Voltage | 20 mV (typ) at 1 mA; allows operation from 2.068 V supply-ideal for single-cell Li-ion or low-voltage battery-powered sensors. |
| Output Noise | 2.2 µVPP (0.1–10 Hz); supports high-resolution 24-bit sigma-delta ADCs without added filtering overhead. |
| Supply Current | 230 µA (typ) active / 0.01 µA (typ) disabled; extends battery life >10 years in always-on sensor nodes with periodic wake-up. |
| Enable Threshold | VIL ≤ 0.4 V, VIH ≥ 0.8×VIN; compatible with 1.8 V, 3.3 V, and 5 V logic without level-shifting circuitry. |
| Load Drive | ±8 mA output capability; directly drives SAR ADC reference inputs, op-amp buffers, or small DACs without external gain stages. |
Pinout & Package
LM4140ACM-2.0 is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm) with exposed pad not electrically connected. Ground pins are internally bonded to minimize thermal resistance and improve PSRR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Common ground return path; all four pins must be soldered to PCB ground plane for optimal thermal dissipation and noise immunity. |
| 2 | VIN | Positive supply input; accepts 1.8 V to 5.5 V; requires ≥0.1 µF bypass capacitor near pin for transient suppression. |
| 3 | EN | Active-high enable control; pulled high to VIN for normal operation; driven low to GND for shutdown (≤1 µA IQ). |
| 5 | NC | No-connect terminal; must remain unconnected and unstubbed to avoid parasitic coupling or EMI pickup. |
| 6 | VREF | Precision 2.048 V output; capable of sourcing/sinking up to 8 mA; requires 1 µF ceramic capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM-DAC Trim | Enables factory calibration of both initial accuracy and temperature curvature-eliminating need for post-package trimming and improving lot-to-lot consistency. |
| Ultra-Low Dropout | 20 mV typical at 1 mA allows use with ultra-low-voltage sources (e.g., coin-cell batteries or energy-harvesting outputs) while maintaining regulation. |
| Integrated Enable Discharge | Internally discharges output capacitor during shutdown-prevents voltage hold-up that could disrupt downstream circuit sequencing or cause latch-up. |
| Low 1/f Noise | 2.2 µVPP (0.1–10 Hz) enables direct interface to high-gain instrumentation amplifiers and precision weigh-scale front-ends without additional noise filtering. |
| Wide Supply Range | Operates from 1.8 V to 5.5 V-supports mixed-voltage systems (e.g., 1.8 V logic + 3.3 V analog rails) without external regulators. |
Applications
| Portable Data Loggers | Precision Weigh Scales |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 1-second intervals for 5+ years. IC Role / Device Role / Timing Role: Provides stable 2.048 V reference for 24-bit delta-sigma ADC measuring bridge-based sensors. Use Value: 3 ppm/°C drift and 230 µA supply current enable <0.01% measurement error over full operating temperature and >10-year battery life. | Use Scenario: Industrial platform scale with 10,000-count resolution using 350 Ω strain gauge bridge. IC Role / Device Role / Timing Role: Supplies excitation voltage to Wheatstone bridge and reference to 20-bit ADC. Use Value: 0.1% initial accuracy and 2.2 µVPP noise ensure repeatability within ±0.005% FS-meeting OIML Class III requirements. |
| Medical Patient Monitors | Automotive Battery Management |
Use Scenario: Portable ECG device acquiring microvolt-level biopotentials with 120 dB SNR requirement. IC Role / Device Role / Timing Role: Reference for programmable-gain instrumentation amplifier and SAR ADC sampling at 1 kSPS. Use Value: Low 1/f noise and 20 mV dropout allow clean signal chain operation from single 3.0 V Li-SOCl₂ cell without LDO overhead. | Use Scenario: BMS module measuring cell voltages in 12S Li-ion pack with ±1 mV accuracy per cell. IC Role / Device Role / Timing Role: Precision reference for multiplexed 16-bit ADC monitoring individual cell voltages. Use Value: 0.1% accuracy and 3 ppm/°C TC ensure <±0.5 mV error over –40°C to +85°C junction range-critical for state-of-charge estimation. |
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, 0.05% initial accuracy, 3 ppm/°C, 1.2 mA supply current, no enable pin | Lacks shutdown mode; higher quiescent current limits battery life in always-on designs | Select when ultimate initial accuracy outweighs power savings and enable functionality |
| ADR4520BRZ | 2.048 V, 0.02% initial accuracy, 2 ppm/°C, 950 µA supply current, no enable pin | No enable function; higher cost and larger SOIC-8 footprint; superior long-term stability (15 ppm/1000h) | Select for lab-grade instrumentation where drift dominates over power or control flexibility |
Compared with REF5020IDR and ADR4520BRZ, LM4140ACM-2.0 uniquely balances ultra-low power (230 µA), integrated enable, and A-grade drift (3 ppm/°C) in a cost-optimized SOIC-8-making it optimal for portable, battery-constrained systems needing precision without complexity.
Availability
LM4140ACM-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and medical diagnostics requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4140ACM-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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM4140 family was engineered specifically for high-accuracy, low-power reference needs in portable and battery-operated equipment-emphasizing low dropout, enable control, and EEPROM-based trimming for production scalability.
FAQ
What is the minimum input voltage required for stable operation of LM4140ACM-2.0?
The LM4140ACM-2.0 requires a minimum input voltage of VREF + 20 mV (2.068 V) at 1 mA load to maintain regulation, per its 20 mV typical dropout specification. At higher loads (e.g., 8 mA), dropout increases to 160–235 mV depending on temperature-so 2.25 V is recommended for full-load operation across 0°C–70°C. The device is not functional below 1.8 V input, regardless of load.
Does LM4140ACM-2.0 require an output capacitor, and what type is recommended?
Yes, LM4140ACM-2.0 requires a 1 µF output capacitor connected between VREF and GND for loop stability and transient response. TI validates solid tantalum (e.g., Kemet T491A105M010AS) and multilayer ceramic capacitors (e.g., Murata GRM42-6Y5V225Z16) meeting ESR specifications in Figure 23. Aluminum electrolytics are discouraged due to ESR rise at low temperatures.
How does the enable pin of LM4140ACM-2.0 behave during power-down?
When the EN pin is pulled low (<0.4 V), LM4140ACM-2.0 enters shutdown mode, reducing supply current to ≤1 µA and actively discharging the output capacitor to ground via internal circuitry-ensuring VREF reaches 0 V within microseconds. This prevents residual voltage from interfering with downstream circuit reset sequencing or causing unintended bias conditions.
Can LM4140ACM-2.0 drive a 10 kΩ load directly without degradation in accuracy?
Yes, LM4140ACM-2.0 can drive a 10 kΩ load (205 µA current) with minimal error: load regulation is specified at 1–20 ppm/mA (≤2 ppm error), and line regulation is ≤200 ppm/V. Combined with 0.1% initial accuracy and 3 ppm/°C drift, total error remains <0.11% across temperature-well within spec for 12-bit systems. No buffer is required for this load.
What is the long-term stability specification for LM4140ACM-2.0, and how is it measured?
LM4140ACM-2.0 exhibits 60 ppm maximum long-term stability after 1000 hours of operation at 25°C, as defined by ΔVREF under continuous bias. This metric reflects parametric shift due to silicon aging and packaging stress-not thermal hysteresis or calibration drift. It is verified via accelerated life testing per TI's reliability qualification standards and applies to all grades (A/B/C) of the LM4140 family.
LM4140ACM-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:
- 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-2.0 FAQ
1.How can I place an order for LM4140ACM-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140ACM-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 LM4140ACM-2.0 reliable?
The price and inventory of LM4140ACM-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 LM4140ACM-2.0 is usually 5 days.
3.What payment methods are accepted for LM4140ACM-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140ACM-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140ACM-2.0?
LM4140ACM-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140ACM-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 LM4140ACM-2.0?
For technical support, including LM4140ACM-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140ACM-2.0 requirements.
6.How does Aetrix verify that LM4140ACM-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4140ACM-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 LM4140ACM-2.0 meets industry standards.
7.What is the process for return or replacement of LM4140ACM-2.0?
All LM4140ACM-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4140ACM-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 LM4140ACM-2.0 part is unused and in its original packaging.
Return procedure for LM4140ACM-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4140ACM-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…
