Product Overview
National Semiconductor LM2941CS 5-Lead Adjustable Positive Voltage Regulator
Condition
Unused new old stock (NOS). Sold each. Markings legible: LM2941CS.
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Product Overview
Delivering adjustable positive low-dropout regulation up to 1 A, the LM2941CS is built for automotive, battery, and industrial power supplies. Housed in a 5-lead TO-263 (DDPAK/D2PAK) surface-mount power package, this device regulates output from 5 V to 20 V using an external resistor divider. It features low dropout performance, typically 0.5 V at full load, alongside reverse battery protection, internal thermal overload limiting, and short-circuit protection.
Key Features
- Adjustable output voltage range from 5 V to 20 V
- 1.0 A maximum continuous output current
- Low dropout voltage typically 0.5 V at 1 A output
- Operating input voltage rating up to 26 V with 60 V transient protection
- ON/OFF shutdown pin compatible with TTL and CMOS logic
- Internal thermal overload and short-circuit current limiting
- 5-lead surface-mount TO-263 (D2PAK) power package with metal tab
Applications
- Power supply regulation in automotive electronics and 12 V vehicle accessories
- Post-regulation for switching power supplies and industrial control boards
- Custom benchtop and embedded microcontroller project power rails
Frequently Asked Questions
How is the output voltage adjusted on the LM2941CS?
Output voltage is programmed between 5 V and 20 V using an external resistor divider connected to the feedback pin and ground.
What heat sinking does the TO-263 package require?
The package tab connects to the die and is typically soldered to a circuit board copper plane to dissipate heat under higher current loads.
What pin layout does this 5-lead device use?
The 5 leads provide connections for input voltage, ON/OFF shutdown control, ground, feedback adjustment, and regulated output voltage. More pieces cost less each - the price-break table on this page shows what each quantity costs.
When an automotive transient spikes or a battery rail sags, this tough five-pin regulator keeps your circuit running smooth. Drop it on the board and dial in your output voltage.
