My Inquiry
My Account
Texas Instruments LM4140ACMX-1.2/NOPB
- Part No.:
- LM4140ACMX-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140ACMX-1.2/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,945
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4140ACMX-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. It features an enable pin for power management, operates down to 1.8 V input, and is optimized for battery-powered instrumentation and precision data acquisition systems.
For engineers reviewing the LM4140ACMX-1.2/NOPB datasheet, LM4140ACMX-1.2/NOPB pinout, LM4140ACMX-1.2/NOPB application, or LM4140ACMX-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 compatibility with 1-µF output capacitance for stability.
Technical Context
The LM4140ACMX-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. Its P-channel pass transistor architecture supports low dropout (20 mV typ.) and reverse-current protection via inherent 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+ DAC reference without trimming) |
| Temp Coefficient | 3 ppm/°C (A grade; ensures ≤225 ppm total drift over 0°C to 70°C operating range) |
| Dropout Voltage | 20 mV (typ. at 1 mA; allows operation from 1.27 V supply - critical for single-cell Li-ion or coin-cell systems) |
| Output Noise | 2.2 µVPP (0.1–10 Hz; low enough for 16-bit SAR ADCs without external filtering) |
| Supply Current | 230 µA (typ. active); ≤1 µA (shutdown; extends battery life in sleep-mode sensor nodes) |
| Load Drive | ±8 mA (sinks/sources; sufficient to drive ADC reference inputs and small op-amp bias networks) |
| Line Regulation | 300 ppm/V (max over temp; maintains accuracy despite battery voltage sag during discharge) |
Pinout & Package
LM4140ACMX-1.2/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not electrically connected. Pin functions are validated per TI SNVS053F Rev F datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Ground return paths; all four pins must be connected to system ground for thermal and noise performance |
| 2 | VIN | Positive supply input; accepts 1.8 V to 5.5 V; internal P-channel pass transistor source |
| 3 | Enable | Digital control input; high = active regulation, low = shutdown (≤0.4 V); must not float |
| 5 | NC | No connect; pin must remain unconnected per datasheet |
| 6 | VREF | Precision 1.25 V output; capable of sourcing/sinking up to 8 mA; requires 1-µF output capacitor |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 3 ppm/°C drift and 0.1% initial accuracy without laser trimming - improves production yield and long-term stability |
| Sub-bandgap output | 1.25 V output below silicon bandgap (1.22 V) - unique among precision references, enabling direct match to 1.25 V ADC/DAC full-scale |
| Active output discharge | Internal circuitry discharges output capacitor during shutdown - prevents voltage hold-up and ensures clean power-down sequencing |
| Reverse current protection | Body diode between VIN and VREF limits reverse current to safe levels (<50 mA) if output is forced above input |
| Low-ESR capacitor support | Stable with 1-µF ceramic capacitors (with ≥0.2 Ω ESR) - reduces board space vs. tantalum while maintaining PSRR >60 dB |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC requiring stable reference across battery discharge cycle. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion; regulates sampling accuracy and offset stability. Use Value: 1.25 V output matches common ADC full-scale range; 3 ppm/°C drift ensures <0.01% measurement error over 0–70°C ambient. | Use Scenario: Industrial PLC analog input module digitizing 4–20 mA sensor signals with 14-bit resolution. IC Role / Device Role / Timing Role: Precision reference for programmable gain instrumentation amplifier and successive-approximation ADC. Use Value: 230 µA supply current minimizes self-heating; 2.2 µVPP noise avoids quantization floor degradation in high-resolution measurements. |
| Battery-Powered Medical Sensors | Automotive Cabin Monitoring |
Use Scenario: Wearable ECG front-end using ultra-low-power MCU and 12-bit ADC. IC Role / Device Role / Timing Role: Reference source for analog signal conditioning and ADC; enabled only during active measurement bursts. Use Value: Enable pin reduces quiescent current to ≤1 µA in standby - extends coin-cell lifetime beyond 2 years. | Use Scenario: Occupancy detection system with MEMS microphone and low-power audio ADC in automotive infotainment head unit. IC Role / Device Role / Timing Role: Stable reference for microphone bias and ADC reference under wide temperature and supply variation. Use Value: 1.8 V minimum input supports operation during cold-crank (battery dip to 6 V → regulator output ~1.8 V); 300 ppm/V line regulation maintains accuracy. |
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 max drift, no enable pin, 50 µA supply current | Lacks shutdown mode; lower accuracy and higher drift limit use in high-stability systems | Select when ultra-low quiescent current is primary requirement and 0.1% accuracy is not needed |
| ADR3412ARJZ-R7 | 1.2 V output, 10 ppm/°C max drift, enable pin, 120 µA supply current, 125 mV dropout | Higher dropout limits use with low-voltage supplies; tighter 10 ppm/°C spec but no EEPROM trimming | Select when moderate drift tolerance suffices and SOIC-8 footprint compatibility is required |
Compared with REF3012AIDBZR and ADR3412ARJZ-R7, LM4140ACMX-1.2/NOPB uniquely delivers 0.1% initial accuracy with 3 ppm/°C drift in SOIC-8, plus enable-controlled shutdown and sub-bandgap 1.25 V output - making it optimal for portable, high-accuracy measurement where supply headroom and long-term stability are critical.
Availability
LM4140ACMX-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and battery-powered medical sensors requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for LM4140ACMX-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, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer design support.
The LM4140 product line was developed to deliver ultra-stable, low-noise, enable-capable voltage references for high-resolution data converters and portable precision instruments - addressing limitations of traditional bandgap references in accuracy, dropout, and power management.
FAQ
What is the minimum input voltage required for stable operation of LM4140ACMX-1.2/NOPB?
The LM4140ACMX-1.2/NOPB requires a minimum input voltage of 1.8 V, with a typical dropout voltage of 20 mV at 1 mA load. This means stable 1.25 V output is guaranteed when VIN ≥ 1.27 V, though full specifications (including 0.1% accuracy and 3 ppm/°C drift) are ensured only at VIN ≥ 1.8 V per the recommended operating conditions in the TI SNVS053F datasheet.
Does LM4140ACMX-1.2/NOPB require an output capacitor, and what type is recommended?
Yes - LM4140ACMX-1.2/NOPB requires a minimum 1-µF output capacitor for loop stability and transient response. TI validates solid tantalum (e.g., Kemet T491A105M010AS), multilayer ceramic (≥0.2 µF, ESR ≥0.2 Ω), and aluminum electrolytic types. Ceramic capacitors are preferred for size and ESR control, but must meet ESR and temperature-coefficient requirements per Figure 22–24 in the datasheet.
How does the enable pin function on LM4140ACMX-1.2/NOPB, and what are its voltage thresholds?
The enable pin (Pin 3) controls on/off state: logic high (≥0.8 × VIN) enables regulation; logic low (≤0.4 V) disables output and reduces supply current to ≤1 µA. The pin must never be left floating - tie to VIN if unused. Input leakage is ≤2 nA, allowing direct interface with MCU GPIOs without additional level-shifting.
Can LM4140ACMX-1.2/NOPB drive an ADC reference input directly, and what is its maximum load current?
Yes - LM4140ACMX-1.2/NOPB can directly drive most precision ADC reference inputs. It sources and sinks up to ±8 mA while maintaining specified accuracy and noise performance. For ADCs requiring >8 mA (e.g., some SAR or sigma-delta types with switched-capacitor inputs), a buffer amplifier or external pass transistor (as shown in TI's Figure 30) is recommended.
What is the long-term stability specification for LM4140ACMX-1.2/NOPB, and how is it measured?
LM4140ACMX-1.2/NOPB exhibits ≤60 ppm change in output voltage after 1000 hours of operation at 25°C, as specified in Section 6.5 of the SNVS053F datasheet. This value reflects parametric shift due to aging and is measured under controlled thermal conditions - distinct from thermal hysteresis (20 ppm) or temperature coefficient effects.
LM4140ACMX-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LM4140ACMX-1.2/NOPB FAQ
1.How can I place an order for LM4140ACMX-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140ACMX-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 LM4140ACMX-1.2/NOPB reliable?
The price and inventory of LM4140ACMX-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 LM4140ACMX-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140ACMX-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140ACMX-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140ACMX-1.2/NOPB?
LM4140ACMX-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140ACMX-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 LM4140ACMX-1.2/NOPB?
For technical support, including LM4140ACMX-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140ACMX-1.2/NOPB requirements.
6.How does Aetrix verify that LM4140ACMX-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140ACMX-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 LM4140ACMX-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140ACMX-1.2/NOPB?
All LM4140ACMX-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140ACMX-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 LM4140ACMX-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4140ACMX-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4140ACMX-1.2/NOPB 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…
