Build with MC33063A — Datasheet Specs & AI Design Help

00 — Overview

What the MC33063A does

The MC34063A series functions as a monolithic control circuit for DC-to-DC converters, available in step-up, step-down, and inverting configurations. This family spans the MC34063A, MC33063A, SC34063A, SC33063A, and NCV33063A variants across commercial, industrial, and automotive temperature grades. The device supports a 3.0 V to 40 V input range, delivers 1.5 A output switch current, and operates up to 100 kHz. It features a precision 2% reference, active current limiting, and low standby current. Designers typically use this part to build compact switching regulators with a minimum number of external components.

Next step

Start building with MC33063A → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.

01 — Key specifications

Datasheet parameters

Datasheet parameters for MC33063A
Parameter	Min	Typ	Max	Conditions	Source
quiescent current	—	4 mA	—	Supply Current, VCC = 5.0 to 40 V, CT = 1.0 nF, Pin 7 = VCC, Pin 5 > Vth, Pin 2 = GND, remaining pins open	onsemi datasheet, p. 3 — MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
output current (abs max)	—	—	1.5 A	Switch Current, max rating	onsemi datasheet, p. 2 — MAXIMUM RATINGS
supply voltage range	3 V	—	40 V		onsemi datasheet, p. 1
switching frequency	—	33 kHz	—	CT = 1.0 nF, Pin 5 = 0 V, TA = 25 C, typical	onsemi datasheet, p. 3 — MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
operating temperature (abs max)	-40 °C	—	85 °C		onsemi datasheet, p. 2 — MAXIMUM RATINGS
power dissipation (abs max)	—	—	1.25 W	ta; Plastic Package, P, P1 Suffix	onsemi datasheet, p. 2 — MAXIMUM RATINGS
standby current	—	1.38 mA	—	VCC = 40 V, CT = 1.0 nF, Pin 7 = VCC, Pin 2 = GND	onsemi datasheet, p. 4
output count	—	1	—		onsemi datasheet, p. 1

02 — Alternatives

Closest matches to MC33063A

MC34063A 2.8× higher operating temperature, similar output current, similar power dissipation

UC2845B 8.6× lower supply voltage range, 8.3× lower output current, 4.6× lower standby current

UC2845BD1013TR 8.6× lower supply voltage range, 8.3× lower output current, 4.6× lower standby current

UC3843BN 8.6× lower supply voltage range, 8.3× lower output current, 4.6× lower standby current

UC3844BD1013TR 8.6× lower supply voltage range, 8.3× lower output current, 4.6× lower standby current

AP63300WU-7 15.2× higher switching frequency, 1.2× lower supply voltage range, similar operating temperature

B0503LS-1WR3 6.1× higher switching frequency, 4.3× higher standby current, 4.3× lower supply voltage range

B0503S-1WR3 8.2× higher switching frequency, 4.3× higher standby current, 4.3× lower supply voltage range

03 — FAQ

Frequently asked questions

What is the maximum operating temperature for the MC33063A?

The operating temperature is 85 °C.

What is the output count for the MC33063A?

The output count is 1.

What is the maximum rating for the switch current?

The output current is 1.5 A.

What is the power dissipation for the MC33063A in a plastic package with P or P1 suffix?

The power dissipation is 1.25 W at ta.

What is the quiescent current when the supply voltage is 5.0 to 40 V, CT is 1.0 nF, Pin 7 is connected to VCC, Pin 5 is greater than Vth, Pin 2 is grounded, and the remaining pins are open?

The quiescent current is 4 mA.

What is the standby current of the MC33063A when VCC = 40 V, CT = 1.0 nF, Pin 7 = VCC, and Pin 2 = GND?

The standby current is 1.38 mA.

What is the supply voltage range for the MC33063A?

The supply voltage range is 40 V.

What is the typical switching frequency when CT = 1.0 nF, Pin 5 = 0 V, and TA = 25 C?

The typical switching frequency is 33 kHz.