Component Library

Quick-reference parameter tables for all 26 components available in Circuit Builder.

Power sources

Battery

Parameter	Default	Unit
Nominal Voltage	9	V
Capacity	1 000	mAh
Internal Resistance	0.1	Ω
Charge Level	100	%
Type	Alkaline	—
Max Operating Temp	55	°C

Sine Generator

Parameter	Default	Unit
Frequency	1k	Hz
Output Voltage	1	V
Output Impedance	50	Ω
THD	1	%

Square Generator

Parameter	Default	Unit
Frequency	1k	Hz
High Voltage	5	V
Low Voltage	0	V
Duty Cycle	50	%
Output Impedance	50	Ω

Ground

No configurable parameters. Connects to 0 V reference.

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Passive components

Resistor

Parameter	Default	Unit
Resistance	10k	Ω
Power Rating	0.25	W
Shape	Cylinder	—
Material	Carbon Film	—
Temp Coefficient	100	ppm/°C
Max Operating Temp	155	°C

Rheostat (variable resistor)

Parameter	Default	Unit
Max Resistance	—	Ω
Min Resistance	—	Ω
Taper	Linear	—

Capacitor (polarized)

Parameter	Default	Unit
Capacitance	1µ	F
Max Voltage	16	V
ESR	0.5	Ω
Leakage Current	1µ	A
Max Operating Temp	85	°C

Capacitor (non-polarized)

Parameter	Default	Unit
Capacitance	100n	F
Max Voltage	50	V
ESR	0.2	Ω
Max Operating Temp	100	°C

Inductor

Parameter	Default	Unit
Inductance	100µ	H
Tolerance	10	%
DCR	—	Ω
Max Current	—	A

Transformer

Parameter	Default	Unit
Turns Ratio	1:1	—
Primary Voltage	—	V
Secondary Voltage	—	V
Power Rating	—	VA
Core Type	Iron	—

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Diodes

Diode

Parameter	Default	Unit
Saturation Current	1e-12	A
Ideality Factor	1.0	—
Series Resistance	0.5	Ω
Reverse Breakdown	50	V
Max Forward Current	1.0	A
Max Power	1.0	W
Thermal Resistance	100	°C/W

LED

Parameter	Default	Unit
Color	Red	—
Forward Voltage	2.0	V
Rated Current	20	mA
Max Reverse Voltage	5.0	V
Max Forward Current	30	mA
Thermal Resistance	150	°C/W

Available colors: Infrared, Red, Orange, Yellow, Green, Blue, Violet, UV, White.

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Transistors

NPN Transistor

Parameter	Default	Unit
Beta (hFE)	100	—
Vbe	0.7	V
Max Vce	40	V
Max Ic	0.2	A
Max Power	0.5	W
Transition Frequency	100M	Hz

PNP Transistor

Same parameters as NPN. Default name: 2N3906.

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MOSFETs

N-Channel MOSFET

Parameter	Default	Unit
Gate Threshold (Vgs_th)	4	V
Max Vds	100	V
Max Id	33	A
Rds(on)	0.077	Ω
Max Power	150	W

P-Channel MOSFET

Same parameters as N-Channel with negative defaults. Default name: IRF9540N.

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Switches

Push Button

Momentary switch. Returns to open when released.

Parameter	Default	Unit
Max Voltage	12	V
Max Current	0.1	A
Contact Resistance	0.05	Ω

Toggle Switch

Latching SPST switch. Click to toggle open/closed.

Parameter	Default	Unit
Max Voltage	250	V
Max Current	2	A

SPDT Switch

Single-pole double-throw. Routes one input to either of two outputs.

Multi Switch

Multi-position rotary switch with up to 6 positions.

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Active components

Bulb

Parameter	Default	Unit
Voltage	—	V
Power	—	W

Glows proportionally to current during simulation.

Relay

Parameter	Default	Unit
Coil Voltage	5	V
Coil Current	70	mA
Max Contact Voltage	250	V
Max Contact Current	10	A

Optocoupler

Electrically isolated LED + phototransistor pair. Configure by part name.

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Measuring instruments

Ammeter

Series current meter. Place in series with the branch to measure.

Parameter	Default	Unit
Internal Resistance	0.1	Ω
Max Current	5	A
Accuracy	1	%

Voltmeter

Parallel voltage meter. Connect in parallel across the component to measure.

Parameter	Default	Unit
Internal Resistance	10	MΩ
Max Voltage	20	V
Accuracy	0.5	%

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Other

Junction

A T-junction node. Required when three or more wires meet at the same point to mark an electrical connection.

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Related pages

Component PropertiesFull property descriptions in context→SimulationHow properties affect simulation→Keyboard ShortcutsAll keyboard shortcuts→