Product Overview
Semtech 3-Terminal 5V Positive Linear Regulator TO-220
Condition
Unused new old stock (NOS). Individual units are in clean physical condition with straight through-hole leads and intact plating. Molded body markings are sharp: LM7805, boxed Semtech logo, date code 02.95, and stamped tab designation.
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Product Overview
The Semtech LM7805 is a classic three-terminal positive linear voltage regulator designed to deliver a stable +5.0V DC output rail. Capable of sourcing up to 1.0A continuous current (and up to 1.5A when paired with an adequate heatsink), this device simplifies power stage design by eliminating the external feedback networks and switching noise associated with switch-mode supplies. Built-in internal thermal overload protection, safe operating area (SOA) protection, and short-circuit current limiting protect the regulator and downstream electronics from fault conditions. Housed in an industry-standard TO-220-3 through-hole package, it fits conventional breadboards, perfboards, and printed circuit board layouts.
Key Features
- Output Voltage: +5.0 V DC (regulated range 4.8 V to 5.2 V)
- Output Current: 1.0 A continuous (up to 1.5 A with suitable heatsink)
- Maximum Input Voltage: 35 V DC
- Dropout Voltage: Typically 2.0 V at 1.0 A
- Package: TO-220-3 through-hole
- Pinout: Pin 1 = Input (VI), Pin 2 = Ground/Case (GND), Pin 3 = Output (VO)
- Internal thermal overload and short-circuit current protection
- Visible Markings: LM7805, boxed Semtech logo, date code 02.95
Applications
- Stepping down unregulated 9V to 18V supplies to power 5V microcontroller boards, TTL logic arrays, and digital displays
- Bench power supply maintenance and linear rail replacements where low electrical noise is required
- Analog audio and preamplifier stages requiring quiet, hum-free DC power rails without switching artifacts
Frequently Asked Questions
What is the pinout configuration for this Semtech LM7805?
Facing the front marked side of the TO-220 package with the leads pointing downward: Pin 1 (left) is Input, Pin 2 (center and connected to the mounting tab) is Ground, and Pin 3 (right) is the regulated +5V Output.
Does this regulator require a heatsink?
For low current loads with a low input-to-output voltage differential, it can run free-standing. When dropping significant voltage (such as 12V or 24V down to 5V) or operating near the 1.0A rating, a heatsink is recommended to dissipate heat and prevent thermal throttling.
Why buy individual Semtech LM7805 regulators from PartsMine?
You can buy the exact count needed for your repair bench or prototype run without getting locked into bulk reels or unvetted grab bags. Every piece is genuine unused stock on hand. If you are stocking up your parts bins, more pieces cost less each, and the price-break table on this page shows what each quantity costs. Orders ship same or next business day from our Idaho warehouse for an $8 flat rate, and shipping is free on orders over $28.
The humble 7805 has quietly powered five decades of electronics without complaint or switching noise. Bolt it down, solder three leads, and let clean 5V DC do the rest.
