AP78L08YG-13 Equivalent & Substitute Parts

Part Overview

The AP78L08YG-13 is a linear voltage regulator IC from Diodes Incorporated, classified as a Power Management (PMIC) component. It delivers a fixed positive 8V output at 100mA in a surface-mount SOT-89-3 package. The device is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	8V
Output Current	100mA
Input Voltage (Max)	23V
Output Configuration	Positive
Package / Case	TO-243AA (SOT-89-3)
Mounting Type	Surface Mount
Protection Features	Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AP78L08YG-13 is determined by the following criteria:

Fixed 8V positive output voltage
100mA output current capability
Surface-mount SOT-89-3 package (TO-243AA case)
Over temperature and short circuit protection
ROHS3 compliance
Maximum input voltage tolerance of 23V or greater

Three substitute parts meet these core requirements with variations in product status, packaging format, and extended protection features.

Parameter Comparison

Parameter	AP78L08YG-13	MC78L08F-TP	UA78L08ACPKG3	UA78L08ACPK
Manufacturer	Diodes Incorporated	Micro Commercial Co	Texas Instruments	Texas Instruments
Output Voltage	8V	8V	8V	8V
Output Current	100mA	100mA	100mA	100mA
Input Voltage (Max)	23V	30V	23V	23V
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Supplier Device Package	SOT-89-3	SOT-89	SOT-89-3	SOT-89-3
Product Status	Obsolete	Active	Last Time Buy	Last Time Buy
Packaging Format	Not specified	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)
Protection Features	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Current, Over Temperature, Reverse Polarity, Short Circuit	Over Current, Over Temperature, Reverse Polarity, Short Circuit
PSRR (120Hz)	46dB	70dB	46dB	46dB
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

MC78L08F-TP (Micro Commercial Co) is the primary active substitute. It maintains identical output specifications and package form factor while offering extended maximum input voltage (30V vs. 23V) and superior PSRR performance (70dB vs. 46dB). Product status is active with current inventory availability.

UA78L08ACPKG3 and UA78L08ACPK (Texas Instruments) are functionally equivalent alternatives with last-time-buy status. Both incorporate enhanced protection features including over-current and reverse-polarity protection beyond the original design. UA78L08ACPKG3 is supplied in tape & reel format; UA78L08ACPK is supplied in cut tape format. Both carry MSL-2 moisture sensitivity ratings requiring one-year shelf-life management.

All three substitutes maintain ROHS3 compliance and identical electrical output characteristics (8V, 100mA, positive configuration) with TO-243AA package compatibility.

Frequently Asked Questions (FAQ)

Q: Can MC78L08F-TP directly replace AP78L08YG-13 in existing designs?

A: Yes. Both devices deliver 8V at 100mA in SOT-89-3 packages with identical pin configurations. The higher maximum input voltage (30V) and improved PSRR of the MC78L08F-TP provide enhanced performance margins without design modification.

Q: What is the difference between UA78L08ACPKG3 and UA78L08ACPK?

A: Both are Texas Instruments UA78L08 variants with identical electrical specifications. The primary difference is packaging format: UA78L08ACPKG3 is supplied in tape & reel (TR) format for automated assembly; UA78L08ACPK is supplied in cut tape (CT) format for manual handling. Both require MSL-2 moisture control.

Q: Why do the Texas Instruments parts have additional protection features?

A: UA78L08ACPKG3 and UA78L08ACPK include over-current and reverse-polarity protection in addition to over-temperature and short-circuit protection. These features provide enhanced circuit robustness compared to the original AP78L08YG-13 design.

Q: Are all substitutes ROHS3 compliant?

A: Yes. AP78L08YG-13, MC78L08F-TP, UA78L08ACPKG3, and UA78L08ACPK are all ROHS3 compliant with REACH unaffected status.

Q: What is the impact of MSL-2 rating on Texas Instruments parts?

A: MSL-2 (1 Year) requires storage at controlled humidity levels and limits shelf life to one year from manufacturing date. MSL-1 (Unlimited) parts like AP78L08YG-13 and MC78L08F-TP have no moisture sensitivity restrictions. Component handling procedures must reflect these differences.

Q: Which substitute offers the best long-term availability?

A: MC78L08F-TP carries active product status with current inventory. UA78L08ACPKG3 and UA78L08ACPK are last-time-buy components with finite stock. For new designs, MC78L08F-TP is the recommended selection for sustained supply chain continuity.

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