MC78L08ABP Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The MC78L08ABP is a linear voltage regulator IC from onsemi, classified as a Power Management (PMIC) component. It provides a fixed positive 8V output at 100mA in a TO-92-3 package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. This reference page identifies direct equivalents and compatible alternatives based on electrical and mechanical parameters.

Substiute Parts

MC78L08ABP

onsemiIn Stock: 1041MC78L08ABP Datasheet

Current PartRFQ

MC78L08ABPG

onsemiIn Stock: 2315MC78L08ABPG Datasheet

DirectRFQ

L78L08ACZ

STMicroelectronicsIn Stock: 9140L78L08ACZ Datasheet

SimilarRFQ

UA78L08ACLP

Texas InstrumentsIn Stock: 2986UA78L08ACLP Datasheet

SimilarRFQ

UA78L08ACLPE3

Texas InstrumentsIn Stock: 3717UA78L08ACLPE3 Datasheet

SimilarRFQ

UA78L08ACLPR

Texas InstrumentsIn Stock: 2269UA78L08ACLPR Datasheet

SimilarRFQ

UA78L08ACLPRE3

Texas InstrumentsIn Stock: 4726UA78L08ACLPRE3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MC78L08ABP are identified based on the following critical parameters that determine functional compatibility:

• Fixed output voltage of 8V
• Output current capability of 100mA
• TO-92-3 package / TO-226-3 case format
• Through-hole mounting configuration
• Positive output configuration with fixed output type
• Protection features including over-temperature and short-circuit protection

Substitutes are grouped into two categories:

Direct Equivalent (Same Manufacturer): MC78L08ABPG from onsemi maintains identical electrical specifications and packaging, with the primary difference being active product status and improved RoHS compliance.

Cross-Manufacturer Alternatives: Parts from STMicroelectronics (L78L08ACZ) and Texas Instruments (UA78L08ACLP, UA78L08ACLPE3, UA78L08ACLPR, UA78L08ACLPRE3) provide equivalent 8V/100mA regulation in TO-92-3 packages. These alternatives may have minor variations in quiescent current, PSRR, input voltage limits, or operating temperature ranges, but maintain core functional compatibility for standard 8V regulation applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MC78L08ABPG from onsemi is the direct equivalent with active product status and ROHS3 compliance. This part maintains identical electrical performance and packaging to the MC78L08ABP while offering improved regulatory compliance and ongoing availability.

Secondary Recommendations: L78L08ACZ from STMicroelectronics provides an active alternative with equivalent core specifications. The slightly lower quiescent current (5.5 mA vs. 6 mA) and reduced PSRR (45dB vs. 57dB) are acceptable trade-offs for applications not requiring maximum noise rejection.

Alternative Options: UA78L08ACLP, UA78L08ACLPE3, UA78L08ACLPR, and UA78L08ACLPRE3 from Texas Instruments are functionally compatible but have reduced maximum input voltage (23V vs. 30V) and narrower operating temperature range (0°C ~ 125°C vs. -40°C ~ 125°C). These parts are suitable for standard industrial applications within the specified temperature and voltage limits. UA78L08ACLPR and UA78L08ACLPRE3 are designated Last Time Buy, indicating limited future availability.

Compliance Consideration: All substitute parts listed are ROHS3 compliant, addressing the non-compliance status of the original MC78L08ABP. For applications requiring RoHS compliance, any of the listed substitutes are acceptable.

Frequently Asked Questions (FAQ)

Q: Can MC78L08ABPG be used as a direct replacement for MC78L08ABP?

A: Yes. MC78L08ABPG is the direct equivalent from onsemi with identical electrical specifications, output voltage (8V), output current (100mA), quiescent current (6 mA), PSRR (57dB), and TO-92-3 packaging. The primary differences are active product status and ROHS3 compliance.

Q: What is the key difference between onsemi and Texas Instruments versions?

A: The Texas Instruments UA78L08 series (UA78L08ACLP, UA78L08ACLPE3, UA78L08ACLPR, UA78L08ACLPRE3) have a maximum input voltage of 23V compared to 30V for onsemi parts, and a narrower operating temperature range of 0°C ~ 125°C versus -40°C ~ 125°C. These differences may affect suitability for extended temperature or high-voltage input applications.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All substitute parts listed are available in TO-226-3 / TO-92-3 package formats with through-hole mounting, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What is the difference between packaging options (Bulk vs. Cut Tape)?

A: Bulk and Cut Tape (CT) refer to supply formats only and do not affect electrical or mechanical compatibility. Bulk packaging is suitable for high-volume production, while Cut Tape is used for lower-volume or mixed-component orders.

Q: Why do some parts show "Last Time Buy" status?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for the part, with limited production remaining. These parts (UA78L08ACLPR, UA78L08ACLPRE3) are still available but should not be selected for new long-term production designs. MC78L08ABPG or L78L08ACZ are preferred for ongoing designs.

Q: Can I use L78L08ACZ if my application requires -40°C operation?

A: No. L78L08ACZ operates from 0°C ~ 125°C and is not rated for -40°C operation. For extended low-temperature applications, MC78L08ABPG or MC78L08ABP must be used.

Q: What protection features are included in these regulators?

A: MC78L08ABP and MC78L08ABPG include over-temperature and short-circuit protection. L78L08ACZ and all Texas Instruments UA78L08 variants include over-current, over-temperature, and short-circuit protection. Texas Instruments variants also include reverse-polarity protection.