L7905 5V Voltage Regulator

The L7905 is a three-terminal linear voltage regulator with a fixed negative output of -5 V. It is the negative partner of the 7805: feed it a negative input voltage and it delivers a steady -5 V rail at up to 1.5 A, with built-in thermal overload and short-circuit protection. Use it to build split (±5 V) power supplies for op-amps, audio and analog circuits.

L7905 Specifications

• Type: fixed negative linear voltage regulator (79xx series)
• Output voltage: -5 V
• Output current: up to 1.5 A (with a suitable heatsink)
• Input voltage: at least about 2 V more negative than the output (for example -7 V), maximum -35 V
• Protection: thermal overload, short-circuit and output safe-area protection
• Pinout (TO-220): 1 = ground, 2 = input, 3 = output

L7905 Applications

• Negative -5 V rail for dual (split) power supplies
• Op-amp and analog audio circuits that need ±5 V
• Bench power supply and lab projects together with a 7805
• Bias circuits and sensor interfaces that need a negative supply

What's in the Box

• 1 × L7905 -5 V voltage regulator

Tip: The L7905 pinout is not the same as the 7805, and on the TO-220 package the metal tab is connected to the input, so insulate it if it shares a heatsink with other parts. Fit capacitors on the input and output (for example 2.2 µF and 1 µF) close to the pins for stable operation.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.