ZSR500C Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The ZSR500C is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed 5V positive output at 200mA in a TO-92-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The ZSR500C serves applications requiring low-current regulated power supply in compact through-hole configurations.

Key Parameters

Parameter	ZSR500C
Manufacturer	Diodes Incorporated
Output Voltage (Fixed)	5V
Output Current	200mA
Input Voltage (Max)	20V
Package / Case	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C
Protection Features	Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the ZSR500C is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V positive
Package / Case: Must be TO-92-3 (TO-226AA) for mechanical and thermal compatibility
Mounting Type: Must be Through Hole
Output Configuration: Must be Positive
Input Voltage (Max): Must support 20V maximum input
RoHS Compliance: Must maintain ROHS3 Compliant status

The substitute parts listed below meet these core requirements. Note that substitute parts have reduced output current ratings (100mA versus 200mA) and therefore are suitable only for applications where the lower current capacity is acceptable.

Parameter Comparison

Parameter	ZSR500C	UA78L05ACLP	UA78L05ACLPE3	UA78L05AILP	UA78L05AILPE3
Manufacturer	Diodes Incorporated	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	5V	5V	5V	5V	5V
Output Current	200mA	100mA	100mA	100mA	100mA
Input Voltage (Max)	20V	20V	20V	20V	20V
Voltage Dropout (Max)	—	1.7V @ 40mA	1.7V @ 40mA	1.7V @ 40mA	1.7V @ 40mA
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Operating Temperature Range	-55°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	Over Temperature, Short Circuit	Over Current, Over Temperature, Reverse Polarity, Short Circuit	Over Current, Over Temperature, Reverse Polarity, Short Circuit	Over Current, Over Temperature, Reverse Polarity, Short Circuit	Over Current, Over Temperature, Reverse Polarity, Short Circuit
PSRR	62dB (120Hz)	49dB (120Hz)	49dB (120Hz)	49dB (120Hz)	49dB (120Hz)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Last Time Buy	Last Time Buy	Last Time Buy	Last Time Buy

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and are available from Texas Instruments with Last Time Buy status, providing documented supply continuity. Selection among the four substitute options depends on operating temperature requirements:

UA78L05ACLP and UA78L05ACLPE3 are suitable for applications with operating temperatures between 0°C and 125°C.

UA78L05AILP and UA78L05AILPE3 are suitable for applications requiring extended low-temperature operation down to -40°C.

The primary design consideration is the reduced output current specification (100mA versus 200mA). Applications drawing more than 100mA at 5V output require alternative solutions beyond this substitute group. All substitute parts are packaged identically in TO-92-3 and mount through-hole, ensuring mechanical compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the ZSR500C be directly replaced with UA78L05ACLP?

A: Mechanical and electrical compatibility exists for the 5V output, TO-92-3 package, and through-hole mounting. However, the UA78L05ACLP has a maximum output current of 100mA compared to the ZSR500C's 200mA. Direct replacement is valid only if the application draws 100mA or less.

Q: What is the difference between UA78L05AILP and UA78L05ACLP?

A: Both parts are identical except for operating temperature range. UA78L05AILP operates from -40°C to 125°C, while UA78L05ACLP operates from 0°C to 125°C. Select based on your application's minimum operating temperature requirement.

Q: Why do the substitute parts have lower current ratings?

A: The substitute parts are from the UA78L05 family, which is a standard industry 5V regulator line with 100mA output. The ZSR500C's 200mA rating is specific to the Diodes Incorporated design. No direct 200mA equivalent exists in the substitute list provided.

Q: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts listed are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original ZSR500C.

Q: What is the significance of the "E3" suffix in part numbers?

A: The E3 suffix indicates RoHS3 compliance certification. Both E3 and non-E3 variants of the UA78L05 series are available; both meet RoHS3 requirements.

Q: Can I use these substitutes in high-temperature applications?

A: All substitute parts support operation up to 125°C maximum. The ZSR500C supports -55°C minimum, while substitutes support either -40°C or 0°C minimum. Verify your application's minimum temperature requirement before selection.

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