What is the pinout of the TIP120 transistor?

In the TO-220 package, pin 1 is Base, pin 2 is Collector, and pin 3 is Emitter. The TIP120 is an NPN Darlington.

What are the key specs of the IRLZ44N MOSFET?

V_DSS = 55V, R_DS(on) = 0.022Ω, and I_D = 47A, in a TO-220AB package.

What modification is needed for a normal PWM idle valve on the solenoid/spare drive circuit?

For any install with a normal PWM idle valve, omit D8 and Q20, replace Q4 with a TIP122, and install a 1N4001 to 12V — see the MSEXTRA manuals.

What components make up the solenoid/spare drive circuit shown?

R19 (1K), Q4 (ZTX450), Q20 (2N3904BU), R39 (1-1/2W), and D8 (a 22V 1W zener), with input Idle-1 and output IDL.

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TIP120 vs IRLZ44N Pinout & Specs - MegaSquirt PWM Idle Valve Driver Schematic

TIP120/IRLZ44N pinout reference with PWM idle-valve solenoid driver schematic

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Composite reference image: TIP120 and IRLZ44N transistor pinouts/specs plus a solenoid/idle-valve PWM driver schematic noting Q4 replacement with TIP122 and a 1N4001 to 12V.

AI caption March 2021 · Photo 68 of 71

This is a composite reference image comparing two transistors and showing a related driver circuit, uploaded as electronics reference material for an engine-management (MegaSquirt-style) project. The left panel is a TIP120 NPN Darlington transistor pinout guide from componentsinfo.com, showing the TO-220 package with pin 1 = Base, pin 2 = Collector, pin 3 = Emitter, plus the internal Darlington circuit and schematic symbol. The center panel is an IRLZ44N N-channel MOSFET summary showing key specs: V_DSS = 55V, R_DS(on) = 0.022Ω, and I_D = 47A, with the MOSFET symbol (G, D, S pins with body diode) and TO-220AB package drawing. The right panel is a schematic fragment of a solenoid/spare drive (idle valve driver) circuit containing R19 (1K), Q4 (ZTX450), Q20 (2N3904BU), R39 (1-1/2W), and D8 (22V 1W zener), with input labeled Idle-1 and output labeled IDL. A note states that for installs with a normal PWM idle valve, D8 and Q20 should be omitted, Q4 replaced with a TIP122, and a 1N4001 installed to 12V, referencing the MSEXTRA manuals. Readers can learn the pinouts, ratings, and idle-drive circuit modification details.

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Frequently asked questions

What is the pinout of the TIP120 transistor?: In the TO-220 package, pin 1 is Base, pin 2 is Collector, and pin 3 is Emitter. The TIP120 is an NPN Darlington.
What are the key specs of the IRLZ44N MOSFET?: V_DSS = 55V, R_DS(on) = 0.022Ω, and I_D = 47A, in a TO-220AB package.
What modification is needed for a normal PWM idle valve on the solenoid/spare drive circuit?: For any install with a normal PWM idle valve, omit D8 and Q20, replace Q4 with a TIP122, and install a 1N4001 to 12V — see the MSEXTRA manuals.
What components make up the solenoid/spare drive circuit shown?: R19 (1K), Q4 (ZTX450), Q20 (2N3904BU), R39 (1-1/2W), and D8 (a 22V 1W zener), with input Idle-1 and output IDL.