MC34063ADE4 Equivalent & Substitute Parts

Part Overview

The MC34063ADE4 is a buck-boost switching regulator IC manufactured by Texas Instruments, designed for positive or negative adjustable output applications. This component integrates step-up and step-down topology in a single 8-SOIC package, delivering 1.5A switch current with adjustable output from 1.25V to 40V across a 3V to 40V input range. The part is discontinued at DiGi Electronics, necessitating equivalent alternatives for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	MC34063ADE4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Function	Step-Up, Step-Down
Topology	Buck, Boost
Output Configuration	Positive or Negative
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	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the MC34063ADE4 is determined by strict equivalence across the following critical parameters:

Core Electrical Specifications:

Input voltage range: 3V to 40V
Output voltage range: 1.25V to 40V (adjustable)
Output current: 1.5A (Switch)
Topology: Buck and Boost capable
Output configuration: Positive or Negative adjustable

Physical & Mechanical Requirements:

Package: 8-SOIC (0.154", 3.90mm Width)
Mounting: Surface Mount
MSL rating: 1 (Unlimited)

Compliance & Certification:

RoHS3 Compliant
REACH Unaffected
ECCN: EAR99

All substitute parts listed maintain these core specifications. Variations in switching frequency (33kHz vs. 100kHz) and operating temperature ranges are noted but do not prevent functional substitution when application requirements are met.

Parameter Comparison

Parameter	MC34063ADE4 (TI)	MC34063AD (Fairchild)	MC34063ABD-TR (STM)	MC34063EBD-TR (STM)	NCV33063AVDR2G (onsemi)	SC33063ADR2G (onsemi)
Manufacturer	Texas Instruments	Fairchild Semiconductor	STMicroelectronics	STMicroelectronics	onsemi	onsemi
Product Status	Discontinued	Obsolete	Active	Active	Active	Active
Voltage - Input (Min)	3V	3V	3V	3V	3V	3V
Voltage - Input (Max)	40V	40V	40V	40V	40V	40V
Voltage - Output (Min/Fixed)	1.25V	1.25V	1.25V	1.25V	1.25V	1.25V
Voltage - Output (Max)	40V	40V	38V	38V	40V	40V
Current - Output	1.5A	1.5A	1.5A	1.5A	1.5A	1.5A
Frequency - Switching	100kHz	100kHz	33kHz	33kHz	33kHz	33kHz
Operating Temperature (Min)	0°C	0°C	-40°C	-40°C	-40°C	-40°C
Operating Temperature (Max)	70°C	70°C	85°C	125°C	125°C	85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	-	Tube	Cut Tape (CT)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

For Active Production (Recommended Primary Choices):

MC34063ABD-TR and MC34063EBD-TR from STMicroelectronics are active products with extended operating temperature ranges (-40°C to 85°C and -40°C to 125°C respectively). Both maintain full electrical equivalence with the original MC34063ADE4 across input/output voltage specifications and current ratings. MC34063EBD-TR offers the widest temperature range, suitable for industrial applications.

NCV33063AVDR2G and SC33063ADR2G from onsemi are active alternatives with identical input/output voltage and current specifications. NCV33063AVDR2G supports -40°C to 125°C operation; SC33063ADR2G operates to 85°C. Both are ROHS3 compliant and REACH unaffected.

For Legacy System Maintenance:

MC34063AD from Fairchild Semiconductor maintains the original 100kHz switching frequency and 0°C to 70°C operating range, providing closest functional alignment to the MC34063ADE4. However, this part is obsolete and availability is limited to existing inventory.

Switching Frequency Consideration:

The MC34063ADE4 operates at 100kHz, while all active substitute parts operate at 33kHz. This difference affects filter component sizing and EMI characteristics. Applications with strict frequency requirements should evaluate circuit performance before final selection.

Temperature Range Consideration:

The original MC34063ADE4 operates from 0°C to 70°C. All active substitutes extend this range to at least -40°C to 85°C, providing enhanced capability for wider environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can MC34063ABD-TR directly replace MC34063ADE4 in existing designs?

A: Yes. Both parts share identical input voltage (3V–40V), output voltage (1.25V–40V adjustable), and output current (1.5A) specifications. The 8-SOIC package pinout is identical. The primary design consideration is the switching frequency difference: MC34063ABD-TR operates at 33kHz versus the original 100kHz. This affects filter component values and PCB layout; circuit simulation is recommended to confirm performance.

Q: What is the difference between MC34063ABD-TR and MC34063EBD-TR?

A: Both are STMicroelectronics products with identical electrical specifications. The primary difference is operating temperature range: MC34063ABD-TR operates from -40°C to 85°C, while MC34063EBD-TR extends to -40°C to 125°C. MC34063EBD-TR is suitable for high-temperature industrial applications. Packaging options differ: MC34063ABD-TR is available in Cut Tape; MC34063EBD-TR is available in Cut Tape and Digi-Reel.

Q: Why do onsemi parts (NCV33063AVDR2G and SC33063ADR2G) have different base part numbers?

A: NCV33063AVDR2G and SC33063ADR2G are distinct product lines from onsemi with different base designations (NCV33063 vs. SC33063). Both maintain electrical equivalence to the MC34063ADE4 across all critical parameters: 3V–40V input, 1.25V–40V output, and 1.5A switch current. The different base numbers reflect internal onsemi product categorization but do not affect functional substitution.

Q: Is the 33kHz switching frequency of active substitutes compatible with my application?

A: Switching frequency affects filter design, efficiency, and EMI performance. The MC34063ADE4 operates at 100kHz; active substitutes operate at 33kHz. Lower frequency reduces switching losses but increases filter component size. Applications with strict frequency requirements should evaluate circuit behavior through simulation or prototype testing before production deployment.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the original MC34063ADE4.

Q: What packaging options are available for substitute parts?

A: MC34063AD is supplied in Tube. MC34063ABD-TR is supplied in Cut Tape. MC34063EBD-TR is available in Cut Tape and Digi-Reel. NCV33063AVDR2G is available in Cut Tape and Digi-Reel. SC33063ADR2G is supplied in Tape & Reel. Select packaging based on production volume and assembly requirements.

Q: Can I use MC34063AD as a substitute despite its obsolete status?

A: MC34063AD maintains the closest functional alignment to MC34063ADE4, including the original 100kHz switching frequency and 0°C to 70°C operating range. However, it is obsolete with limited inventory availability. Use only if existing stock is available and long-term supply is not required. For new designs or ongoing production, select active alternatives.

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