Specifications
| Attribute | Value |
| Package | Tube |
| ProductStatus | Active |
| OutputConfiguration | Positive |
| OutputType | Fixed |
| NumberofRegulators | 1 |
| Voltage-Input(Max) | 35V |
| Voltage-Output(Min/Fixed) | 9V |
| VoltageDropout(Max) | 2V @ 1A (Typ) |
| Current-Output | 1A |
| Current-Quiescent(Iq) | 8 mA |
| PSRR | 61dB (120Hz) |
| ProtectionFeatures | Over Temperature, Short Circuit |
| OperatingTemperature | 0°C ~ 125°C |
| MountingType | Through Hole |
| Package/Case | TO-220-3 |
Overview
Description
MC7809CTG is a fixed 9 V positive linear voltage regulator (78xx family) in a TO‑220 (CTG) package. It converts a higher DC input (up to about 35 V) to a stable 9 V output at up to roughly 1 A. It has three pins: input, ground, output (pinout from left to right when facing the front: input, ground, output). Protective features include current limiting and thermal shutdown. For stability, use capacitors close to the regulator (typical: 0.33 µF on input and 0.1 µF on output). Applications: simple power supplies, microcontroller boards, and any circuit needing a fixed 9 V rail. The MC prefix comes from Motorola (now ON Semiconductor); CTG denotes the specific package/lead-frame variant. With proper heatsinking, it delivers its rated current; without adequate cooling, dissipation limits performance. Always refer to the latest datasheet for exact electrical and thermal specs.
Equivalent
Equivalent products to MC7809CTG (9V fixed regulator) include:
- LM7809 (Texas Instruments)
- L7809CV (STMicroelectronics)
- KA7809 (Fairchild/Renesas)
- NCP7809 (ON Semiconductor)
- NTE7809 (NTE Electronics)
All are 9V fixed linear regulators in similar TO-220/through-hole packages.
- LM7809 (Texas Instruments)
- L7809CV (STMicroelectronics)
- KA7809 (Fairchild/Renesas)
- NCP7809 (ON Semiconductor)
- NTE7809 (NTE Electronics)
All are 9V fixed linear regulators in similar TO-220/through-hole packages.
Features
Here are the main features of MC7809CTG:
- Fixed 9-volt output; up to 1 A load current
- Internal current limit and thermal/shutdown protection
- Safe-area protection for overload conditions
- Wide input range up to 35 V; dropout about 2 V at rated current
- Stable with minimal external components; typically needs input 0.33 µF and output 0.1 µF capacitors
- Industrial operating temperature: -40°C to +125°C
- Package: 3-pin TO-220AB (Pb-free CTG variant)
- Fixed 9-volt output; up to 1 A load current
- Internal current limit and thermal/shutdown protection
- Safe-area protection for overload conditions
- Wide input range up to 35 V; dropout about 2 V at rated current
- Stable with minimal external components; typically needs input 0.33 µF and output 0.1 µF capacitors
- Industrial operating temperature: -40°C to +125°C
- Package: 3-pin TO-220AB (Pb-free CTG variant)
Pinout
- Pin count: 3
- Pinout (front view, left to right): Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output
- Function: Positive 9V fixed regulator (linear), provides a regulated +9V output from a higher input voltage (up to ~35V) with about 1 A current capability (with adequate heatsinking).
- Pinout (front view, left to right): Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output
- Function: Positive 9V fixed regulator (linear), provides a regulated +9V output from a higher input voltage (up to ~35V) with about 1 A current capability (with adequate heatsinking).
Manufacturer
- Manufacturer: ON Semiconductor (ON Semi), a US-based global semiconductor company.
- What kind of company: A multinational manufacturer of integrated circuits and discrete semiconductors, specializing in power management, analog, sensors, and other ICs for automotive, industrial, communications, and consumer markets.
- What kind of company: A multinational manufacturer of integrated circuits and discrete semiconductors, specializing in power management, analog, sensors, and other ICs for automotive, industrial, communications, and consumer markets.
Application
MC7809CTG is a fixed +9 V voltage regulator (TO-220). Common application areas:
- Stable +9 V rail for microcontrollers, digital logic, op-amps, and analog circuits in consumer electronics, instrumentation, and audio gear
- Pre-regulator or post-regulator stage in switch-mode supplies
- Automotive and industrial electronics
- Battery-powered devices and educational/hobby projects needing a simple, rugged 9 V supply
Design notes: use proper input/output capacitors for stability; heat sinking may be required for higher input voltages or heavier loads.
- Stable +9 V rail for microcontrollers, digital logic, op-amps, and analog circuits in consumer electronics, instrumentation, and audio gear
- Pre-regulator or post-regulator stage in switch-mode supplies
- Automotive and industrial electronics
- Battery-powered devices and educational/hobby projects needing a simple, rugged 9 V supply
Design notes: use proper input/output capacitors for stability; heat sinking may be required for higher input voltages or heavier loads.
Package
TO-220AB (through-hole) package. The “G” suffix indicates Pb-free/Green variant.
