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Product Detailed Parameters
- Description：IC REG LINEAR 12V 1A TO3
- Series：-
- Mfr：Texas Instruments
- Package：Tray
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：35V
- Voltage - Output (Min/Fixed)：12V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：2V @ 1A
- Current - Output：1A
- Current - Quiescent (Iq)：6 mA
- Current - Supply (Max)：-
- PSRR：72dB (120Hz)
- Control Features：-
- Protection Features：Over Temperature, Short Circuit
- Operating Temperature：-55°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-205AD, TO-39-3 Metal Can
- Supplier Device Package：TO-3
- Grade：-
- Qualification：-
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Overview
The LM140K-12/NOPB is a fixed-output linear voltage regulator from the LM140K series, manufactured by Texas Instruments. It provides a stable 12 V output with a maximum current capacity of 1 A. The device operates within an input voltage range of 14.6 V to 35 V and features a line regulation of 18 mV and load regulation of 32 mV. It utilizes a TO-3-2 through-hole package and supports a wide operating temperature range from -55 °C to +125 °C. Typical power supply rejection ratio (PSRR) is 72 dB, with a static current of 6 mA.
Feature Summary
- Industrial-grade thermal and electrical robustness designed for demanding environments
- Fixed positive voltage regulation ensuring consistent output stability under varying loads
- High ripple rejection capability for clean power delivery in sensitive circuits
Applications
- Industrial control systems requiring reliable power regulation
- Military and aerospace electronic equipment
- Automotive electronics operating in extreme temperatures
Procurement Notes
Verify the complete part number including the suffix /NOPB to ensure compliance with lead-free manufacturing standards. Confirm that the TO-3-2 package matches your PCB footprint requirements. Check datasheet specifications for thermal management needs given the high-power dissipation potential at full load. Ensure input voltage remains within the specified 14.6 V to 35 V range to prevent damage or dropout.
Selection Notes
Select this component when a fixed 12 V output is required with up to 1 A current capability in harsh environments. Consider the TO-3-2 package for superior heat dissipation compared to smaller packages. Evaluate the 18 mV line regulation and 32 mV load regulation against system tolerance requirements. Compare PSRR performance if noise sensitivity is critical. Verify compatibility with existing thermal design constraints due to the through-hole mounting style.
Part Context
This regulator belongs to the LM140 family of three-terminal positive regulators. The 'K' suffix denotes the industrial temperature grade (-55 °C to +125 °C), distinguishing it from commercial variants. The '12' indicates the fixed 12 V output voltage. The '/NOPB' suffix signifies a non-halogenated, lead-free product compliant with RoHS directives. This variant is part of Texas Instruments' legacy but widely used in industrial applications requiring proven reliability.
Replacement Considerations
LM140K-12 without NOPB suffix offers identical electrical characteristics but may differ in environmental compliance. LM340K-12/NOPB provides similar functionality but is rated for commercial temperature range only. LM140LAH-12/NOPB is a lower current (100 mA) alternative in a different package. Direct substitution requires verifying temperature range and package compatibility.
