ZSR500CL Equivalent & Substitute Parts

Part Overview

The ZSR500CL 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 ZSR500CL delivers regulated power management in applications requiring low-current 5V rails with through-hole mounting compatibility.

Key Parameters

Parameter	ZSR500CL
Manufacturer	Diodes Incorporated
Output Voltage (Fixed)	5V
Output Current	200mA
Input Voltage (Max)	20V
Output Configuration	Positive
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Operating Temperature	-55°C ~ 125°C
Protection Features	Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the ZSR500CL is determined by the following critical parameters:

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

The substitute parts identified are all Texas Instruments UA78L05 series regulators. These devices share the same output voltage, package form factor, and mounting type as the ZSR500CL. However, the output current rating differs: substitute parts deliver 100mA versus the ZSR500CL's 200mA. This represents a functional limitation that must be evaluated against application requirements.

Parameter Comparison

Parameter	ZSR500CL	UA78L05ACLP	UA78L05ACLPE3	UA78L05AILP	UA78L05AILPE3	UA78L05CLP	UA78L05CLPE3
Manufacturer	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	5V	5V	5V	5V	5V	5V	5V
Output Current	200mA	100mA	100mA	100mA	100mA	100mA	100mA
Input Voltage (Max)	20V	20V	20V	20V	20V	20V	20V
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive	Positive
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-55°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Voltage Dropout (Max)	Not specified	1.7V @ 40mA	1.7V @ 40mA	1.7V @ 40mA	1.7V @ 40mA	1.7V @ 40mA	1.7V @ 40mA
PSRR	62dB (120Hz)	49dB (120Hz)	49dB (120Hz)	49dB (120Hz)	49dB (120Hz)	49dB (120Hz)	49dB (120Hz)
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	Over Current, Over Temperature, Reverse Polarity, Short Circuit	Over Current, Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	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	Obsolete	Obsolete

Engineering Selection Recommendations

All identified substitute parts are Texas Instruments UA78L05 series linear voltage regulators with ROHS3 compliance and EAR99 ECCN classification, matching the regulatory status of the ZSR500CL.

Primary consideration: Output current capacity. The ZSR500CL delivers 200mA, while all substitute parts deliver 100mA. Selection must be based on actual circuit load requirements. If the application draws more than 100mA, substitution is not feasible without circuit redesign.

Temperature range options:

UA78L05AILP and UA78L05AILPE3 support -40°C ~ 125°C operating range, closer to the ZSR500CL's -55°C ~ 125°C specification
UA78L05ACLP, UA78L05ACLPE3, UA78L05CLP, and UA78L05CLPE3 support 0°C ~ 125°C operating range

Product status: UA78L05AILP and UA78L05AILPE3 carry Last Time Buy status with highest inventory availability (28,900 and 2,494 units respectively), providing better supply continuity than obsolete alternatives.

Protection features: All substitute parts include Over Current and Reverse Polarity protection in addition to Over Temperature and Short Circuit protection, providing enhanced circuit protection compared to the ZSR500CL.

Frequently Asked Questions (FAQ)

Q: Can UA78L05 series parts directly replace the ZSR500CL?

A: Mechanical and electrical compatibility is confirmed for package, voltage output, and input specifications. However, the 100mA output current rating of UA78L05 parts versus the ZSR500CL's 200mA rating must be evaluated against circuit load requirements. Direct substitution is only valid if circuit current draw does not exceed 100mA.

Q: What is the difference between UA78L05AILP and UA78L05ACLP?

A: Both are Texas Instruments UA78L05 regulators in TO-92-3 packages with identical electrical specifications. The primary difference is operating temperature range: UA78L05AILP supports -40°C ~ 125°C, while UA78L05ACLP supports 0°C ~ 125°C. Selection depends on application temperature requirements.

Q: Why do some part numbers include "PE3" suffix?

A: The PE3 suffix indicates RoHS3 compliance with specific lead-free processing. UA78L05ACLPE3, UA78L05AILPE3, and UA78L05CLPE3 are functionally equivalent to their non-PE3 counterparts with identical electrical performance and package specifications.

Q: Are there inventory considerations for substitution?

A: UA78L05AILP has the highest inventory availability at 28,900 units. UA78L05CLPE3 offers 7,300 units. Other variants have lower stock levels. Inventory status should be confirmed with suppliers for production planning.

Q: What additional protection does the UA78L05 series provide?

A: UA78L05 parts include Over Current and Reverse Polarity protection features not present in the ZSR500CL specification. These provide enhanced circuit protection in applications where input polarity reversal or excessive load current is a concern.

Q: Is the PSRR difference between ZSR500CL and UA78L05 significant?

A: The ZSR500CL specifies 62dB PSRR at 120Hz, while UA78L05 parts specify 49dB at 120Hz. This 13dB difference indicates the ZSR500CL provides superior power supply rejection ratio. Applications requiring high noise rejection should evaluate this specification against circuit requirements.

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