KA34063A Equivalent & Substitute Parts

Part Overview

The KA34063A is a buck-boost switching regulator IC manufactured by onsemi, designed for positive or negative adjustable output applications. This device integrates step-up and step-down topology in a single 8-DIP package, delivering 1.5A switch current across an input voltage range of 3V to 40V. The KA34063A is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility while offering improved availability and active product status.

Key Parameters

Parameter	Value
Function	Step-Up, Step-Down (Buck-Boost)
Output Configuration	Positive or Negative Adjustable
Number of Outputs	1
Voltage - Input (Min)	3V
Voltage - Input (Max)	40V
Current - Output	1.5A (Switch)
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Operating Temperature	0°C ~ 70°C (TA)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the KA34063A is determined by strict adherence to the following electrical and mechanical parameters:

Critical Compatibility Parameters:

Package type: 8-DIP (0.300", 7.62mm) form factor
Input voltage range: 3V to 40V minimum
Output current: 1.5A switch current
Topology: Buck-Boost configuration
Output configuration: Positive or Negative adjustable
Mounting type: Through Hole

Substitute parts are grouped into three categories based on product status and operational enhancements:

MFR Recommended: MC34063AP1G offers active product status with identical electrical specifications and improved availability.

Direct Substitutes: MC34063ACN, MC34063AP, and MC34063ECN maintain core functionality with package compatibility. These parts differ in switching frequency and maximum output voltage specifications but remain within acceptable operating parameters for buck-boost applications.

Upgrade Options: MC33063AP, MC33063AP1G, MC34063ABN, and MC34063EBN provide extended temperature ranges and active product status, suitable for applications requiring enhanced thermal performance or long-term supply assurance.

Parameter Comparison

Part Number	Manufacturer	Status	Input Voltage (Min-Max)	Output Voltage (Min-Max)	Output Current	Switching Frequency	Operating Temperature	Package
KA34063A	onsemi	Obsolete	3V - 40V	- (Adjustable)	1.5A	100Hz ~ 100kHz	0°C ~ 70°C	8-DIP
MC34063AP1G	onsemi	Active	3V - 40V	1.25V - 40V	1.5A	100kHz	0°C ~ 70°C	8-DIP
MC34063ACN	STMicroelectronics	Active	3V - 40V	1.25V - 38V	1.5A	33kHz	0°C ~ 70°C	8-DIP
MC34063AP	onsemi	Obsolete	3V - 40V	1.24V - 40V	1.5A	100Hz ~ 100kHz	0°C ~ 70°C	8-DIP
MC34063ECN	STMicroelectronics	Active	3V - 40V	1.25V - 38V	1.5A	33kHz	0°C ~ 70°C	8-DIP
MC33063AP	onsemi	Obsolete	3V - 40V	1.24V - 40V	1.5A	100kHz	-40°C ~ 85°C	8-DIP
MC33063AP1G	onsemi	Active	3V - 40V	1.25V - 40V	1.5A	100kHz	-40°C ~ 85°C	8-DIP
MC34063ABN	STMicroelectronics	Active	3V - 40V	1.25V - 38V	1.5A	33kHz	-40°C ~ 85°C	8-DIP
MC34063EBN	STMicroelectronics	Active	3V - 40V	1.25V - 38V	1.5A	33kHz	-40°C ~ 125°C	8-DIP

Engineering Selection Recommendations

For Direct Replacement (Identical Operating Temperature Range):

MC34063AP1G is the primary recommended substitute. It maintains the 0°C to 70°C operating temperature range of the KA34063A while offering active product status, ensuring long-term availability and supply chain stability. This part is functionally equivalent with fixed 100kHz switching frequency and output voltage range of 1.25V to 40V.

MC34063ACN and MC34063ECN are direct alternatives from STMicroelectronics with active status. Both operate within the same temperature range and maintain 1.5A output current and 8-DIP packaging. The 33kHz switching frequency differs from the original specification but remains compatible with buck-boost applications.

For Extended Temperature Applications:

MC33063AP1G provides the widest active product availability with -40°C to 85°C operating range, suitable for industrial and automotive environments. This upgrade maintains 100kHz switching frequency and 1.25V to 40V output voltage specification.

MC34063ABN and MC34063EBN extend temperature performance to -40°C to 85°C and -40°C to 125°C respectively, with STMicroelectronics manufacturing and active product status. MC34063EBN specifically supports the highest temperature range, appropriate for high-reliability applications.

All substitute parts maintain ROHS3 compliance and through-hole mounting compatibility with the original KA34063A footprint.

Frequently Asked Questions (FAQ)

Q: Can MC34063AP1G directly replace KA34063A in existing designs?

A: Yes. MC34063AP1G maintains identical input voltage range (3V to 40V), output current (1.5A), package type (8-DIP), and operating temperature range (0°C to 70°C). The fixed 100kHz switching frequency and 1.25V to 40V output voltage specification are compatible with buck-boost applications designed for the KA34063A.

Q: What is the difference between onsemi and STMicroelectronics variants?

A: Both manufacturers produce functionally equivalent parts within the MC34063 and MC33063 families. onsemi variants (MC34063AP1G, MC33063AP1G) typically feature 100kHz switching frequency. STMicroelectronics variants (MC34063ACN, MC34063ECN, MC34063ABN, MC34063EBN) operate at 33kHz. Selection depends on application switching frequency requirements and manufacturer preference.

Q: Are there temperature range considerations for substitution?

A: The KA34063A operates from 0°C to 70°C. Direct substitutes maintain this range. Extended-temperature variants (MC33063AP1G, MC34063ABN, MC34063EBN) support -40°C to 85°C or -40°C to 125°C, suitable for applications requiring broader thermal performance. Standard-range parts are appropriate for consumer and commercial applications within 0°C to 70°C.

Q: Does switching frequency affect circuit design?

A: Switching frequency is specified in the datasheet but does not prevent substitution. KA34063A supports 100Hz to 100kHz. MC34063AP1G and MC33063AP1G operate at fixed 100kHz. STMicroelectronics parts operate at 33kHz. Filter and component selection may require adjustment based on the selected switching frequency, but all parts maintain 1.5A output current and buck-boost topology.

Q: Are all substitute parts ROHS3 compliant?

A: MC34063AP1G, MC34063ACN, MC34063ECN, MC33063AP1G, MC34063ABN, and MC34063EBN are ROHS3 compliant. MC34063AP does not specify ROHS3 compliance. For applications requiring ROHS3 certification, select from the compliant variants listed above.

Q: What is the inventory status of substitute parts?

A: MC34063AP1G (19,247 pcs), MC34063ECN (55,100 pcs), and MC33063AP1G (5,300 pcs) offer the highest active inventory levels. All recommended substitutes maintain new original stock availability through authorized distributors.

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