AP78L05VL-A Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AP78L05VL-A is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed positive 5V output at 100mA. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The part operates across an input voltage range up to 20V and includes integrated over-temperature and short-circuit protection. Equivalent parts maintain the same electrical output specifications and mechanical form factor while offering improved availability and extended product lifecycle support.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	20V
Quiescent Current (Iq)	5 mA
PSRR	62dB (120Hz)
Operating Temperature Range	-20°C ~ 85°C
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Protection Features	Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AP78L05VL-A is determined by the following critical parameters:

Fixed output voltage of 5V
Output current capability of 100mA minimum
TO-92-3 package form factor with through-hole mounting
Input voltage tolerance (minimum 20V, preferably 30V for margin)
Protection features (over-temperature and short-circuit minimum)
RoHS3 compliance and REACH unaffected status

Substitute parts are grouped into two categories: Direct Diodes Incorporated equivalents (AS78L05 series) and manufacturer-recommended alternatives from STMicroelectronics and onsemi. All listed substitutes maintain electrical compatibility with the original specification while offering active product status and improved availability.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Iq (mA)	PSRR (120Hz)	Operating Temp	Product Status	Packaging
AP78L05VL-A	Diodes Inc.	5V	100mA	20V	5	62dB	-20°C ~ 85°C	Obsolete	TO-92-3
AS78L05ZTR-E1	Diodes Inc.	5V	100mA	30V	5.5	62dB	-40°C ~ 125°C	Active	TO-92-3
AS78L05ZTR-G1	Diodes Inc.	5V	100mA	30V	5.5	62dB	-40°C ~ 125°C	Active	TO-92-3
L78L05ABZ-AP	STMicroelectronics	5V	100mA	30V	5.5	49dB	-40°C ~ 125°C	Active	TO-92-3
L78L05ABZ-TR	STMicroelectronics	5V	100mA	30V	5.5	49dB	-40°C ~ 125°C	Active	TO-92-3
L78L05ACZ-AP	STMicroelectronics	5V	100mA	30V	5.5	49dB	0°C ~ 125°C	Active	TO-92-3
L78L05ACZTR	STMicroelectronics	5V	100mA	30V	5.5	49dB	0°C ~ 125°C	Active	TO-92-3
L78L05CZ	STMicroelectronics	5V	100mA	30V	5.5	49dB	0°C ~ 125°C	Not For New Designs	TO-92-3
MC78L05ABPRAG	onsemi	5V	100mA	30V	6	49dB	-40°C ~ 125°C	Active	TO-92-3
MC78L05ABPREG	onsemi	5V	100mA	30V	6	49dB	-40°C ~ 125°C	Active	TO-92-3
MC78L05ABPRMG	onsemi	5V	100mA	30V	6	49dB	-40°C ~ 125°C	Active	TO-92-3

Engineering Selection Recommendations

For new designs and production applications, select from parts with Active product status. The Diodes Incorporated AS78L05ZTR-E1 and AS78L05ZTR-G1 provide the closest electrical match to the original AP78L05VL-A, maintaining identical PSRR performance at 62dB while offering extended temperature range and higher input voltage tolerance. These parts are available in high volume (500,200 and 3,190 units respectively) and maintain the same manufacturer lineage.

STMicroelectronics L78L05 series parts (L78L05ABZ-AP, L78L05ABZ-TR, L78L05ACZ-AP, L78L05ACZTR) are manufacturer-recommended alternatives with Active status and substantial inventory availability (7,173 to 98,605 units). These parts accept higher input voltages (30V) and provide extended operating temperature ranges. The trade-off is reduced PSRR performance (49dB versus 62dB).

onsemi MC78L05 series parts (MC78L05ABPRAG, MC78L05ABPREG, MC78L05ABPRMG) represent additional Active alternatives with comparable specifications to the STMicroelectronics line. All three variants are available in cut-tape packaging with inventory levels between 1,320 and 21,400 units.

Avoid L78L05CZ (Not For New Designs status) for new applications despite its availability.

Frequently Asked Questions (FAQ)

Q: Can AS78L05ZTR-E1 and AS78L05ZTR-G1 be used interchangeably with AP78L05VL-A?

A: Yes. Both parts maintain the same 5V output, 100mA current rating, and TO-92-3 package. The AS78L05 variants offer superior specifications with extended temperature range (-40°C to 125°C versus -20°C to 85°C) and higher input voltage rating (30V versus 20V). Quiescent current increases marginally from 5mA to 5.5mA.

Q: What is the difference between AS78L05ZTR-E1 (Cut Tape) and AS78L05ZTR-G1 (Tape & Box)?

A: Both parts are electrically identical. The difference is packaging format. Cut Tape (CT) is supplied on continuous tape for automated assembly. Tape & Box (TB) includes the tape wound in a box. Select based on assembly process requirements.

Q: Why do STMicroelectronics and onsemi parts show lower PSRR (49dB) compared to the original?

A: PSRR (Power Supply Rejection Ratio) is a specified parameter provided by each manufacturer. The 49dB rating from STMicroelectronics and onsemi parts remains within acceptable performance for linear regulator applications at 100mA output. The original 62dB specification is not a requirement for functional substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the original AP78L05VL-A certification.

Q: Which substitute part has the highest inventory availability?

A: L78L05ACZTR from STMicroelectronics has the highest inventory at 98,605 units in stock.

Q: Can I use L78L05CZ as a substitute?

A: L78L05CZ is marked "Not For New Designs" and should not be selected for new applications. Use Active-status alternatives instead.

Q: What is the operating temperature consideration when selecting a substitute?

A: The original AP78L05VL-A operates from -20°C to 85°C. Most substitutes extend this range to -40°C to 125°C (or 0°C to 125°C for L78L05ACZ variants). If your application requires the narrower original temperature range, verify that the substitute's extended range does not introduce thermal management complications in your circuit design.

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