UA78L15ACLP Equivalent & Substitute Parts

Part Overview

The UA78L15ACLP is a linear voltage regulator IC from Texas Instruments designed to provide a fixed positive 15V output at 100mA. This through-hole TO-92-3 packaged component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device is suitable for applications requiring low-current regulated power supplies with thermal and short-circuit protection.

Substiute Parts

UA78L15ACLP

Texas InstrumentsIn Stock: 3632UA78L15ACLP Datasheet

Current PartRFQ

TLV76015DBZT

Texas InstrumentsIn Stock: 2901TLV76015DBZT Datasheet

MFR RecommendedRFQ

LM78L15ACZ/NOPB

National SemiconductorIn Stock: 8184LM78L15ACZ/NOPB Datasheet

MFR RecommendedRFQ

L78L15ACZ

STMicroelectronicsIn Stock: 35688L78L15ACZ Datasheet

MFR RecommendedRFQ

MC78L15ABPG

onsemiIn Stock: 1902MC78L15ABPG Datasheet

MFR RecommendedRFQ

MC78L15ACPG

onsemiIn Stock: 4201MC78L15ACPG Datasheet

MFR RecommendedRFQ

UA78L15ACLP

Texas InstrumentsIn Stock: 3632UA78L15ACLP Datasheet

Parametric EquivalentRFQ

UA78L15ACLPE3

Texas InstrumentsIn Stock: 2914UA78L15ACLPE3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the UA78L15ACLP is determined by the following critical parameters:

• Fixed output voltage of 15V
• Output current capability of 100mA
• Maximum input voltage tolerance (30V or higher)
• Package compatibility (TO-92-3 through-hole or equivalent form factor)
• Protection features (over-temperature and short-circuit minimum requirements)
• Operating temperature range compatibility

Substitute parts are grouped into two categories:

Category 1: Direct Package Equivalents (Through-Hole TO-92-3) Parts maintaining identical through-hole TO-92-3 packaging for direct PCB replacement without layout modification.

Category 2: Modern Surface-Mount Alternative Parts offering improved electrical performance in surface-mount packaging for new designs or board redesigns.

Parameter Comparison

Engineering Selection Recommendations

For Direct PCB Replacement (Through-Hole Designs)

LM78L15ACZ/NOPB, L78L15ACZ, MC78L15ABPG, and MC78L15ACPG are all active product alternatives maintaining TO-92-3 through-hole packaging. All four parts meet the core electrical requirements: 15V fixed output, 100mA current capability, and equivalent protection features. Selection among these four should be based on:

• Availability and supply chain continuity
• Operating temperature range requirements (MC78L15ABPG supports -40°C to 125°C; others support 0°C to 125°C)
• PSRR performance (LM78L15ACZ/NOPB offers 51dB at 120Hz versus 39dB for alternatives)
• Input voltage margin (LM78L15ACZ/NOPB, L78L15ACZ, and onsemi variants support 35V maximum input versus 30V for the original)

For New Designs or Board Redesigns (Surface-Mount)

TLV76015DBZT provides a modern surface-mount alternative in SOT-23-3 packaging. This part delivers improved voltage dropout performance (1.1V @ 100mA) and extended operating temperature range (-40°C to 125°C). Surface-mount implementation reduces PCB footprint and improves thermal characteristics. This option requires PCB layout modification and is suitable for new product development or board revisions.

Compliance Considerations

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part. Selection should prioritize active product status to ensure long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can I use TLV76015DBZT as a direct replacement for UA78L15ACLP on an existing PCB?

A: No. TLV76015DBZT uses SOT-23-3 surface-mount packaging while UA78L15ACLP uses through-hole TO-92-3 packaging. Direct PCB replacement requires a through-hole package. TLV76015DBZT is suitable only for new designs or boards undergoing redesign.

Q: What are the key differences between the through-hole substitute options?

A: All through-hole substitutes (LM78L15ACZ/NOPB, L78L15ACZ, MC78L15ABPG, MC78L15ACPG) provide 15V at 100mA with TO-92-3 packaging. Primary differences include: LM78L15ACZ/NOPB offers superior PSRR (51dB); MC78L15ABPG supports extended temperature range (-40°C to 125°C); and input voltage tolerance varies between 30V and 35V maximum.

Q: Is the voltage dropout specification critical for my application?

A: Voltage dropout becomes significant in applications with limited input voltage headroom. UA78L15ACLP specifies 1.7V dropout at 40mA. TLV76015DBZT improves this to 1.1V at 100mA. Through-hole alternatives do not specify dropout, but typical values are comparable to the original. Verify dropout performance against your minimum input voltage requirement.

Q: Are all substitutes RoHS compliant?

A: All recommended substitutes maintain ROHS3 compliance. Verify compliance documentation with your supplier for specific production batches.

Q: Can I substitute parts between different manufacturers?

A: Yes. All recommended substitutes meet the electrical and mechanical requirements for 15V, 100mA linear regulation in compatible packages. Cross-manufacturer substitution is valid provided package and electrical specifications align with your application requirements.

Q: What should I consider when transitioning from obsolete UA78L15ACLP to an active substitute?

A: Prioritize product status (all recommended substitutes are active), verify package compatibility with your PCB layout, confirm operating temperature range adequacy, and validate input voltage tolerance for your power supply design. Electrical performance is equivalent across all through-hole options for standard applications.