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

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.