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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

onsemi MC33063AP1

Name: MC33063AP1
Brand: onsemi
SKU: MC33063AP1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC33063AP1

Manufacturer:: onsemi

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: MC33063AP1.pdf

Description:: IC REG BUCK BOOST ADJ 1.5A 8PDIP

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Product details

Overview

MC33063AP1 from onsemi is a monolithic DC-DC switching regulator IC supporting step-up, step-down, and inverting topologies. It integrates a temperature-compensated 1.25 V reference, comparator, oscillator with active current limiting, driver, and 1.5 A Darlington output switch. Designed for minimal external components, it operates from 3.0 V to 40 V input and delivers adjustable output voltage in industrial power conversion applications.

For engineers reviewing the MC33063AP1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.5 A switch current capability, ±2% reference accuracy, 100 kHz max switching frequency, thermal performance in PDIP-8 package, and compatibility with standard buck/boost/invert designs per AN920A/D.

Technical Context

The MC33063AP1 implements a fixed-frequency, current-mode control architecture using an internal oscillator whose timing is set by an external capacitor (CT) and discharge/charge current ratio. Its Darlington output stage enables robust 1.5 A peak switch current with V_CE(sat) ≤ 1.3 V at 1.0 A, while the precision 1.25 V reference (±2%) sets output voltage via external resistor divider.

It features active cycle-by-cycle current limiting triggered at 250–350 mV across the sense resistor, low standby current (<4 mA), and operation across −40°C to +85°C ambient. The device supports three fundamental converter configurations without requiring external gate drivers or controllers.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.0 V to 40 V DC - supports wide-input industrial and automotive battery-supplied systems.
Output Switch Current	1.5 A peak - enables up to ~175 mA output in step-up mode or 500 mA in step-down mode with proper inductor sizing.
Reference Voltage	1.25 V ±2% - determines output voltage accuracy and stability in feedback loop design.
Max Switching Frequency	100 kHz - balances efficiency, EMI, and external component size (inductor/capacitor).
Current Limit Threshold	250–350 mV across R_SC - sets precise overcurrent protection point independent of supply voltage.
Operating Temperature	−40°C to +85°C - qualified for extended industrial environments, not automotive-grade (NCV variant required).
Package Thermal Resistance	R_JA = 115°C/W (PDIP-8) - defines maximum power dissipation limit (1.25 W at T_A = 25°C) for thermal design.

Pinout & Package

MC33063AP1 is housed in an 8-pin PDIP (Plastic Dual In-line Package), Case 626-05, with 0.300-inch width and through-hole mounting. Pin 1 is marked by a notch or dot; leads are tin-lead or Pb-free per marking suffix.

Pin/Terminal	Circuit Role	Design Meaning
1	Switch Collector	High-side collector of internal Darlington transistor; connects to inductor in boost, diode anode in buck, or transformer primary in inverter.
2	GND	Power and signal ground reference for oscillator, comparator, and driver circuits.
3	Timing Capacitor (CT)	Connects external capacitor to set oscillator frequency; discharge/charge currents define f_osc.
4	Driver Collector	Collector of internal driver transistor; used when external NPN/PNP boost is needed beyond 1.5 A.
5	Comparator Inverting Input	Feedback node for output voltage regulation; connected to resistor divider from V_OUT.
6	I_Pk Sense	Current limit sense input; voltage across R_SC feeds here to terminate switch-on time.
7	V_CC	Main supply input (3–40 V); powers internal circuitry and charges CT capacitor.
8	Switch Emitter	Emiter of internal Darlington; tied to GND in standard configurations; forms current-sense path with Pin 6.

Key Features

Feature	Design Value
Integrated Darlington switch	Eliminates need for external high-current transistor in most <1.5 A applications, reducing BOM count and layout area.
Adjustable output voltage	Set via two-resistor feedback divider from V_OUT to Pin 5, enabling precise regulation across wide output ranges.
Internal 1.25 V reference	±2% tolerance ensures stable feedback reference unaffected by supply variation or temperature drift.
Current-mode oscillator	CT-based timing provides predictable frequency setting and inherent cycle-by-cycle current limiting for robust overload protection.
Pb-free, RoHS-compliant	Meets environmental compliance requirements for industrial manufacturing without lead exemptions.

Applications

Industrial Power Supply	Automotive Accessory Converter
Use Scenario: Generating +12 V from a 5 V microcontroller rail to drive relays or sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Step-up DC-DC controller regulating output with 1.25 V reference and current-limited switching. Use Value: Enables compact, low-cost isolated power without transformer; achieves 87.7% efficiency at 175 mA per Figure 9.	Use Scenario: Converting 12 V vehicle battery to stable 5 V for USB charging ports in aftermarket dashcams or telematics units. IC Role / Device Role / Timing Role: Step-down regulator with adjustable feedback and thermal shutdown margin in −40°C to +85°C range. Use Value: Delivers 500 mA at 83.7% efficiency (Figure 11); withstands load dump transients up to 40 V input rating.
Portable Instrumentation	Negative Rail Generator
Use Scenario: Providing regulated +3.3 V from single-cell Li-ion (3.0–4.2 V) in handheld test meters with low quiescent current demand. IC Role / Device Role / Timing Role: Buck converter operating near minimum input voltage with low standby current (<4 mA). Use Value: Maintains regulation down to 3.0 V input; line/load regulation within ±0.12% per Figure 11 test data.	Use Scenario: Creating −12 V rail from 5 V USB supply for op-amp biasing in portable audio analyzers or sensor signal conditioning. IC Role / Device Role / Timing Role: Inverting topology controller using internal switch and external diode/inductor. Use Value: Achieves −12 V/100 mA with 62.2% efficiency and ±0.012% line regulation (Figure 13).

Industrial Power Supply

Automotive Accessory Converter

Use Scenario: Generating +12 V from a 5 V microcontroller rail to drive relays or sensors in factory automation PLC modules.

IC Role / Device Role / Timing Role: Step-up DC-DC controller regulating output with 1.25 V reference and current-limited switching.

Use Value: Enables compact, low-cost isolated power without transformer; achieves 87.7% efficiency at 175 mA per Figure 9.

Use Scenario: Converting 12 V vehicle battery to stable 5 V for USB charging ports in aftermarket dashcams or telematics units.

IC Role / Device Role / Timing Role: Step-down regulator with adjustable feedback and thermal shutdown margin in −40°C to +85°C range.

Use Value: Delivers 500 mA at 83.7% efficiency (Figure 11); withstands load dump transients up to 40 V input rating.

Portable Instrumentation

Negative Rail Generator

Use Scenario: Providing regulated +3.3 V from single-cell Li-ion (3.0–4.2 V) in handheld test meters with low quiescent current demand.

IC Role / Device Role / Timing Role: Buck converter operating near minimum input voltage with low standby current (<4 mA).

Use Value: Maintains regulation down to 3.0 V input; line/load regulation within ±0.12% per Figure 11 test data.

Use Scenario: Creating −12 V rail from 5 V USB supply for op-amp biasing in portable audio analyzers or sensor signal conditioning.

IC Role / Device Role / Timing Role: Inverting topology controller using internal switch and external diode/inductor.

Use Value: Achieves −12 V/100 mA with 62.2% efficiency and ±0.012% line regulation (Figure 13).

Equivalent & Alternatives

The following parts are listed as comparable options for similar DC-DC switching regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC34063AP1	Same architecture and pinout; rated for 0°C to +70°C ambient (vs. −40°C to +85°C for MC33063AP1).	Suitable for commercial-grade equipment only; not qualified for extended temperature industrial use.	Select when cost sensitivity outweighs temperature range requirement and ambient stays above 0°C.
NCV33063AVDR2G	SOIC-8 automotive-grade variant; AEC-Q100 qualified, −40°C to +125°C junction, PPAP-capable.	Required for automotive body electronics, infotainment power rails, or safety-critical subsystems.	Choose for automotive OEM programs where qualification, traceability, and extended temperature are mandatory.

Compared with MC33063AP1, MC34063AP1 trades industrial temperature range for lower cost and commercial qualification, while NCV33063AVDR2G adds automotive reliability and SOIC packaging at higher unit cost and different thermal profile.

Availability

MC33063AP1 is available at Aetrix Electronics and suitable for industrial power supplies, automotive accessory converters, portable instrumentation, and negative rail generators requiring stable component supply and long-term manufacturability.

Supply support for MC33063AP1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MC33063A series belongs to onsemi's legacy switching regulator product line, designed specifically for cost-sensitive, discrete-component-based DC-DC conversion in industrial and general-purpose applications where integration level and feature count are secondary to reliability and ease of implementation.

FAQ

What is the maximum output current achievable with MC33063AP1 in step-down configuration?

The MC33063AP1 supports up to 500 mA output current in step-down mode, as demonstrated in Figure 11 with 25 V input delivering 5 V/500 mA at 83.7% efficiency. This assumes proper thermal design (R_JA = 115°C/W), appropriate inductor sizing (220 µH), and external diode selection (1N5819). Peak switch current remains limited to 1.5 A, so output current scales inversely with duty cycle and losses.

Does MC33063AP1 support synchronous rectification?

No, MC33063AP1 does not support synchronous rectification. It relies on an external Schottky diode (e.g., 1N5819) for freewheeling in buck and boost topologies, as shown in Figures 9, 11, and 13. The internal Darlington switch and driver stage are optimized for driving external diodes or bipolar transistors-not MOSFET gates-so no gate-drive outputs or timing controls for synchronous FETs are provided.

Can MC33063AP1 be used in a flyback converter topology?

No, MC33063AP1 is not suitable for flyback converter implementation. Its internal switch is a single-ended Darlington transistor with emitter referenced to ground (Pin 8), lacking isolation or transformer-coupled drive capability. Flyback requires primary-side switch with floating gate drive and opto-coupled or auxiliary winding feedback-functions absent in the MC33063AP1 architecture.

What is the recommended timing capacitor value for 50 kHz operation with MC33063AP1?

For 50 kHz oscillator frequency, a 470 pF timing capacitor is recommended, based on Figure 3 and typical discharge/charge current values (I_dischg ≈ 220 µA, I_chg ≈ 35 µA). At V_CC = 12 V and T_A = 25°C, CT = 470 pF yields f_osc ≈ 48–52 kHz. Always verify with actual board measurements, as parasitic capacitance and layout affect final frequency.

Is MC33063AP1 pin-compatible with MC34063AP1?

Yes, MC33063AP1 is fully pin-compatible with MC34063AP1: identical 8-pin PDIP package, matching pin functions (Switch Collector, GND, CT, Driver Collector, etc.), and identical electrical interface. The only differences are operating temperature range (−40°C to +85°C vs. 0°C to +70°C) and minor parameter tolerances-making them direct drop-in replacements where ambient conditions allow.

MC33063AP1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Function:: Step-Up, Step-Down

Output Configuration:: Positive or Negative

Topology:: Buck, Boost

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 3V

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 1.25V

Voltage - Output (Max):: 40V (Switch)

Current - Output:: 1.5A (Switch)

Frequency - Switching:: 100kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-PDIP

MC33063AP1 FAQ

1.How can I place an order for MC33063AP1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MC33063AP1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MC33063AP1 reliable?

The price and inventory of MC33063AP1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063AP1 is usually 5 days.

3.What payment methods are accepted for MC33063AP1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063AP1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC33063AP1?

MC33063AP1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC33063AP1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MC33063AP1?

For technical support, including MC33063AP1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063AP1 requirements.

6.How does Aetrix verify that MC33063AP1 is sourced from the original manufacturer or authorized distributors?

All MC33063AP1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC33063AP1 meets industry standards.

7.What is the process for return or replacement of MC33063AP1?

All MC33063AP1 units undergo pre-shipment inspection (PSI). If there is an issue with MC33063AP1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MC33063AP1 part is unused and in its original packaging.

Return procedure for MC33063AP1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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