Product Overview
National Semiconductor LM2941T 1A Low Dropout Positive Regulator TO-220-5
Condition
New condition. Package markings read 49AL LM2941T P+ with intact, straight through-hole leads. Visual inspection confirms clean pins with no solder residue or installation marks.
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Product Overview
The National Semiconductor LM2941T is an adjustable 1-ampere positive low-dropout (LDO) linear voltage regulator housed in a 5-lead TO-220 package. Engineered for automotive and battery-powered electronics, it delivers regulated output from 5V to 20V with a low typical dropout voltage of 0.5V at full load, providing dependable operation even under fluctuating or transient supply conditions.
Key Features
- Output voltage adjustable between 5.0 V and 20.0 V
- 1.0 A minimum guaranteed output current
- Typical dropout voltage of 0.5 V at 1.0 A load (1.0 V maximum across temperature)
- Wide operating input range from 6.0 V to 26.0 V with transient protection to 60 V
- Integrated reverse battery protection and load dump protection
- Internal short-circuit current limiting and thermal shutdown protection
- TTL and CMOS-compatible ON/OFF shutdown control pin
- Standard 5-lead through-hole TO-220 package (TO5A)
Applications
- Automotive electrical systems requiring robust load-dump and reverse-polarity protection
- Battery-powered test fixtures and instruments where low-dropout capability maximizes usable battery life
- Clean linear post-regulation stages following switching converters to minimize supply ripple
- Benchtop power supply builds and DIY microcontroller projects needing adjustable 1A current capacity
Frequently Asked Questions
What is the pinout configuration for the 5-pin TO-220 package?
The 5-lead TO-220 layout consists of Pin 1: Feedback / Adjust, Pin 2: ON/OFF Shutdown control, Pin 3: Ground / Tab, Pin 4: Input voltage (VIN), and Pin 5: Output voltage (VOUT).
Is an output capacitor required for stability?
Yes. Low-dropout linear regulators require an output capacitor between VOUT and Ground with appropriate equivalent series resistance (ESR) to maintain loop stability across load steps.
Can the regulator be shut down using digital logic?
Yes. The dedicated ON/OFF control pin accepts TTL and CMOS voltage logic levels to switch the output into low-quiescent-current standby mode.
Why buy an individual National Semiconductor regulator here rather than a bulk lot?
Purchasing individual, fully inspected pieces avoids paying for surplus excess when your repair bench or prototype run only calls for one or two parts. Standard shipping is an $8 flat rate, free on orders over $28, and orders leave our Idaho warehouse the same or next business day.
Solid analog silicon that stays quiet under pressure, ready to drop straight into your circuit and hold the line.
