LM4140ACM-1.2 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments LM4140ACM-1.2 is a precision shunt voltage reference with a 1.25 V nominal output, 0.2% initial accuracy, and 10 ppm/°C typical temperature coefficient in an 8-pin SOIC package.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- LM4140ACM-1.2 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- High-precision 1.25 V shunt reference with initial accuracy of ±0.2% (1.2488 V to 1.2513 V output range)
- Ultra-low temperature coefficient of 10 ppm/°C typical, maintaining stable reference voltage across -40°C to +125°C
- Operates with reverse current and supports wide operating current range, compatible with low-power analog front-end designs
- 8-pin SOIC package (R-PDSO-G8) enabling straightforward PCB placement alongside precision ADCs and DACs
Applications
The LM4140ACM-1.2 is ideal as a precision bias or reference voltage source in data acquisition systems, instrumentation amplifiers, and 12-bit to 16-bit ADC reference circuits where tight initial accuracy and low drift are essential. Its 1.25 V output and wide temperature range make it suitable for industrial measurement equipment, medical instrumentation, and precision power supplies requiring a stable shunt reference from -40°C to +125°C.
Specifications
| Pbfree Code | No |
| YTEOL | 0 |
| Analog IC - Other Type | THREE TERMINAL VOLTAGE REFERENCE |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e0 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Voltage-Max | 1.2513V |
| Output Voltage-Min | 1.2488V |
| Output Voltage-Nom | 1.25V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 235 |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1.8V |
| Supply Voltage-Nom (Vsup) | 3V |
| Surface Mount | YES |
| Temp Coef of Voltage-Max | 3ppm/°C |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | TIN LEAD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 20 |
| Trim/Adjustable Output | NO |
| Voltage Tolerance-Max | 0.1% |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LM4140ACM-1.2:
Voltage Reference, 1 Output, 1.25V, PDSO8
Frequently Asked Questions
What is the output accuracy and temperature stability of LM4140ACM-1.2?
The LM4140ACM-1.2 provides a nominal 1.25 V output with ±0.2% initial accuracy, corresponding to an output range of 1.2488 V to 1.2513 V. Its typical temperature coefficient is 10 ppm/°C, which means over a -40°C to +125°C range the drift remains extremely small, making it suitable for precision 12-bit and 16-bit ADC reference applications.
Which ADC or DAC designs benefit most from using the LM4140ACM-1.2 as an external reference?
High-resolution ADC designs of 12 bits or greater benefit most from the LM4140ACM-1.2 because a 1 LSB error at 12-bit resolution corresponds to roughly 244 µV on a 1.25 V span. The 0.2% initial accuracy and 10 ppm/°C drift keep the reference well within that tolerance over the full industrial temperature range of -40°C to +125°C.
How does LM4140ACM-1.2 compare to a bandgap reference at 1.25 V in terms of noise and drift?
Compared to simple bandgap references, the LM4140ACM-1.2 offers a curvature-corrected output with 10 ppm/°C typical drift and low broadband noise, making it a better fit for precision instrumentation. A basic bandgap may exhibit 50 ppm/°C or more, which on a 1.25 V reference causes a 62.5 µV/°C error—unacceptable for 14-bit or 16-bit systems.
What package and pin count does LM4140ACM-1.2 use, and how does this affect layout?
LM4140ACM-1.2 uses an 8-pin SOIC (R-PDSO-G8) package with 1.27 mm lead pitch, allowing standard PCB footprint routing. The 3-terminal shunt reference configuration uses only 3 active pins—cathode, anode, and trim—leaving 5 pins as no-connect, which simplifies the layout and reduces parasitics on the reference output line.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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