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

onsemi MC33063AP1G

Name: MC33063AP1G
Brand: onsemi
SKU: MC33063AP1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC33063AP1G

Manufacturer:: onsemi

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: MC33063AP1G.pdf

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

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Product details

Overview

MC33063AP1G from onsemi is a monolithic DC-DC converter controller IC designed for step-down (buck), step-up (boost), and voltage-inverting applications. It integrates a temperature-compensated 1.25 V reference, comparator, oscillator with active current limiting, driver, and 1.5 A high-current output switch. Operates from 3.0 V to 40 V input, supports up to 100 kHz switching frequency, and delivers precision 2% reference accuracy - used in industrial power supplies and battery-powered instrumentation.

For engineers reviewing the MC33063AP1G datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (3–40 V), output switch current capability (1.5 A), adjustable output voltage via external resistors, oscillator timing capacitor control, and thermal performance in PDIP-8 package.

Technical Context

The MC33063AP1G implements a fixed-frequency, current-mode control architecture using an internal oscillator whose frequency is set by an external timing capacitor (CT) and discharge/charge current ratio. Its Darlington-connected output switch enables robust 1.5 A peak current handling with typical V_CE(sat) of 1.0 V at 1.0 A.

It features a precision 1.25 V ±2% bandgap reference referenced to the inverting comparator input (Pin 5), enabling stable feedback across temperature (−40°C to +85°C operating range). Current limit sensing occurs at Pin 7 via a resistor (R_sc) with threshold V_ipk(sense) = 300 mV (typ), directly controlling peak switch current.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.0 V to 40 V - supports wide-input industrial and automotive battery systems without pre-regulation.
Output Switch Current	1.5 A peak - enables direct drive of medium-power converters without external boost transistors.
Oscillator Frequency	Up to 100 kHz - sets practical upper bound for inductor size and EMI filtering requirements.
Reference Voltage	1.25 V ±2% - provides stable feedback node for accurate output voltage regulation across temperature.
Current Limit Threshold	300 mV (typ) at Pin 7 - defines peak switch current as I_pk = 0.3 / R_sc, enabling precise overcurrent protection.
Operating Temperature	−40°C to +85°C - qualified for industrial ambient environments, not automotive-grade (NCV variant required).
Package	PDIP-8 (Case 626) - through-hole mounting compatible with legacy PCB assembly and prototyping.

Pinout & Package

MC33063AP1G is housed in an 8-pin plastic dual in-line package (PDIP-8), Case 626, with 0.300-inch body width and 0.100-inch lead pitch. Leads are tin-lead or Pb-free per marking "G" suffix.

Pin/Terminal	Circuit Role	Design Meaning
1	Switch Collector	High-side collector of internal Darlington transistor - connects to inductor/diode node in boost/inverting topologies.
2	Switch Emitter	Emitting terminal of internal switch - tied to ground in buck configuration; forms return path for switch current.
3	Timing Capacitor	Connects external CT capacitor - sets oscillator frequency via charge/discharge timing (f ≈ 1/(2.4·CT·R_sc)).
4	GND	Power and signal reference ground - must be low-impedance connection to minimize noise coupling into comparator.
5	Comparator Inverting Input	Feedback node for output regulation - connected to resistor divider from V_out to set regulated voltage as V_out = 1.25·(1 + R1/R2).
6	I_pk Sense	Current limit sense input - monitors voltage across R_sc between Pins 1 and 2 to terminate switch conduction.
7	Driver Collector	Open-collector driver output - drives external NPN/PNP transistors when internal switch is insufficient (≥1.5 A).
8	V_CC	Main supply input - powers internal circuitry; also serves as bias source for external components like timing resistor.

Key Features

Feature	Design Value
Integrated 1.5 A Darlington switch	Eliminates need for external power transistor in ≤1.5 A applications, reducing BOM count and layout area.
Adjustable oscillator frequency	Set via single CT capacitor (24–42 kHz typ at 1 nF), enabling optimization of efficiency vs. size trade-offs.
Precision 1.25 V reference	±2% tolerance over −40°C to +85°C ensures stable output regulation without external trimming.
Low standby current	Typical I_CC ≤ 4.0 mA - minimizes quiescent loss in battery-operated systems during light-load operation.
Current-limit protection	Internal 300 mV threshold at Pin 6 provides cycle-by-cycle overcurrent shutdown without auxiliary sensing circuitry.

Applications

Industrial DC Power Supply	Battery-Powered Instrumentation
Use Scenario: Generating stable 5 V or 12 V rails from unregulated 9–24 V industrial bus or AC/DC adapter outputs. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing buck topology with external inductor, diode, and capacitor. Use Value: Delivers up to 1.5 A output with <±0.05% line regulation (Fig. 9 test data), minimizing need for post-regulation LDOs.	Use Scenario: Boosting single-cell Li-ion (3.0–4.2 V) or alkaline (0.9–1.5 V/cell) battery voltage to 3.3 V or 5 V for microcontrollers and sensors. IC Role / Device Role / Timing Role: Step-up (boost) converter controller with integrated switch, configured using CT = 1500 pF and R_sc = 0.22 Ω. Use Value: Achieves 87.7% efficiency at 175 mA load (Fig. 9), extending battery runtime while maintaining compact footprint.
Voltage-Inverting Power Rail	Legacy Equipment Retrofit
Use Scenario: Generating negative supply (e.g., −12 V) from positive 5 V rail in analog signal conditioning circuits or op-amp biasing. IC Role / Device Role / Timing Role: Inverting regulator controller with external inductor, diode, and capacitor; uses same feedback network as buck/boost. Use Value: Provides −12 V @ 100 mA with only 3.0 mV line regulation (Fig. 13), suitable for precision analog subsystems requiring clean negative bias.	Use Scenario: Replacing obsolete discrete-based DC-DC solutions in aging industrial controllers or test equipment where space and reliability are constrained. IC Role / Device Role / Timing Role: Drop-in functional replacement for MC34063A-based designs due to identical pinout, electrical specs, and PDIP-8 packaging. Use Value: Maintains existing PCB layout and bill-of-materials while adding Pb-free compliance and improved thermal stability (−40°C to +85°C).

Industrial DC Power Supply

Battery-Powered Instrumentation

Use Scenario: Generating stable 5 V or 12 V rails from unregulated 9–24 V industrial bus or AC/DC adapter outputs.

IC Role / Device Role / Timing Role: Primary DC-DC controller implementing buck topology with external inductor, diode, and capacitor.

Use Value: Delivers up to 1.5 A output with <±0.05% line regulation (Fig. 9 test data), minimizing need for post-regulation LDOs.

Use Scenario: Boosting single-cell Li-ion (3.0–4.2 V) or alkaline (0.9–1.5 V/cell) battery voltage to 3.3 V or 5 V for microcontrollers and sensors.

IC Role / Device Role / Timing Role: Step-up (boost) converter controller with integrated switch, configured using CT = 1500 pF and R_sc = 0.22 Ω.

Use Value: Achieves 87.7% efficiency at 175 mA load (Fig. 9), extending battery runtime while maintaining compact footprint.

Voltage-Inverting Power Rail

Legacy Equipment Retrofit

Use Scenario: Generating negative supply (e.g., −12 V) from positive 5 V rail in analog signal conditioning circuits or op-amp biasing.

IC Role / Device Role / Timing Role: Inverting regulator controller with external inductor, diode, and capacitor; uses same feedback network as buck/boost.

Use Value: Provides −12 V @ 100 mA with only 3.0 mV line regulation (Fig. 13), suitable for precision analog subsystems requiring clean negative bias.

Use Scenario: Replacing obsolete discrete-based DC-DC solutions in aging industrial controllers or test equipment where space and reliability are constrained.

IC Role / Device Role / Timing Role: Drop-in functional replacement for MC34063A-based designs due to identical pinout, electrical specs, and PDIP-8 packaging.

Use Value: Maintains existing PCB layout and bill-of-materials while adding Pb-free compliance and improved thermal stability (−40°C to +85°C).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC34063AP1G	Identical electrical specs and pinout; rated for 0°C to +70°C ambient (vs. −40°C to +85°C for MC33063A).	Suitable for commercial-temperature applications only; not recommended for industrial environments with cold start or extended temperature cycling.	Select MC34063AP1G only if operating ambient stays within 0–70°C and RoHS/Pb-free compliance is confirmed.
LM2574N-5.0	Fixed 5.0 V output, 0.5 A switch current, no external timing capacitor - simpler but less flexible than MC33063AP1G's adjustable topology.	Best for cost-sensitive, fixed-output applications where output voltage never changes; requires redesign for non-5 V outputs.	Choose LM2574N-5.0 only when fixed 5 V output and lower current (<0.5 A) suffice, accepting loss of topology flexibility.

Compared with MC34063AP1G, the MC33063AP1G extends operational temperature to −40°C and improves thermal stability for industrial use; compared with LM2574N-5.0, it offers full topology flexibility (buck/boost/invert), higher current, and adjustable output - at the cost of greater external component count and design effort.

Availability

MC33063AP1G is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, voltage-inverting rails, and legacy equipment retrofit requiring stable component supply and long-term manufacturability.

Supply support for MC33063AP1G 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 supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MC33063A series was engineered as a general-purpose, low-cost DC-DC controller family targeting cost-sensitive industrial and instrumentation applications requiring flexible topology support and robust thermal performance across extended temperature ranges.

FAQ

What is the maximum input voltage rating for the MC33063AP1G?

The MC33063AP1G has an absolute maximum input voltage rating of 40 V on the V_CC pin (Pin 8). Operation above this level risks permanent damage. The device is specified to operate continuously from 3.0 V to 40 V, making it suitable for 24 V industrial buses and wide-range battery inputs. Always include transient suppression if input may exceed 40 V during surge events.

Can the MC33063AP1G be used in a step-up (boost) configuration?

Yes, the MC33063AP1G is explicitly designed for step-up (boost) operation, as confirmed in its datasheet title and Figure 9. In boost mode, Pin 1 (Switch Collector) connects to the inductor, Pin 2 (Switch Emitter) to ground, and the output diode bridges inductor and output capacitor. The MC33063AP1G achieves 28 V @ 175 mA with 87.7% efficiency in validated boost test conditions.

What is the purpose of Pin 7 (Driver Collector) on the MC33063AP1G?

Pin 7 is an open-collector driver output used to interface with external NPN or PNP transistors when the internal 1.5 A Darlington switch is insufficient. It allows current boosting beyond 1.5 A peak - for example, driving an external NPN in Figure 10a. Unlike the internal switch, Pin 7 does not have built-in current limiting and requires external base/resistor control.

How is the output voltage adjusted on the MC33063AP1G?

The MC33063AP1G uses a precision 1.25 V reference applied to the inverting input of its internal comparator (Pin 5). Output voltage is set by a resistor divider (R1 from V_out to Pin 5, R2 from Pin 5 to GND): V_out = 1.25 V × (1 + R1/R2). This method enables fully adjustable output from ~1.25 V upward, independent of input voltage or load, as verified in Figures 9, 11, and 13.

Does the MC33063AP1G support voltage-inverting (negative output) topologies?

Yes, the MC33063AP1G supports voltage-inverting configurations, as demonstrated in Figure 13 of the official datasheet. In this mode, it generates −12 V @ 100 mA from a 4.5–6.0 V input with 62.2% efficiency and ±0.012% line regulation. The inverting topology reuses the same feedback network and timing components as buck/boost, requiring only reconfiguration of inductor and diode placement.

MC33063AP1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tube

Product Status:: Active

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

MC33063AP1G FAQ

1.How can I place an order for MC33063AP1G through Aetrix?

Please submit a Request for Quotation (RFQ) for MC33063AP1G 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 MC33063AP1G reliable?

The price and inventory of MC33063AP1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33063AP1G is usually 5 days.

3.What payment methods are accepted for MC33063AP1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33063AP1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC33063AP1G?

MC33063AP1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC33063AP1G 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 MC33063AP1G?

For technical support, including MC33063AP1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33063AP1G requirements.

6.How does Aetrix verify that MC33063AP1G is sourced from the original manufacturer or authorized distributors?

All MC33063AP1G 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 MC33063AP1G meets industry standards.

7.What is the process for return or replacement of MC33063AP1G?

All MC33063AP1G units undergo pre-shipment inspection (PSI). If there is an issue with MC33063AP1G, 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 MC33063AP1G part is unused and in its original packaging.

Return procedure for MC33063AP1G:

1.Submit a request within 90 days.

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

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