KA76L05ZTA Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA76L05ZTA is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 100mA. This is a through-hole TO-92-3 package device with integrated protection features including over-temperature, over-voltage, and short-circuit protection. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across output voltage, current capacity, dropout voltage, and thermal operating range while accommodating the through-hole TO-92-3 package form factor.

Key Parameters

Parameter	KA76L05ZTA
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	33V
Dropout Voltage (Max)	0.6V @ 100mA
Quiescent Current	1 mA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Protection Features	Over Temperature, Over Voltage, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the KA76L05ZTA are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Fixed output voltage of 5V
Output current rating of 100mA minimum
TO-92-3 package (through-hole, formed leads)
Operating temperature range of -40°C to 125°C
Input voltage tolerance (maximum 26V to 35V acceptable)
Dropout voltage performance (lower values preferred but not mandatory for substitution)

The substitute parts are grouped into two categories: onsemi LP2950 series variants (active product status with improved specifications) and Texas Instruments LM2931 series variants (last-time-buy status with comparable performance). National Semiconductor LM78L05ACZ/LFT4 is included as an alternative with extended input voltage rating. All substitutes maintain the same output voltage, current capacity, and package configuration as the original KA76L05ZTA.

Parameter Comparison

Parameter	KA76L05ZTA	LP2950ACZ-5.0G	LP2950CZ-5.0G	LM2931AZ-5.0/NOPB	LM2931Z-5.0/NOPB	LM78L05ACZ/LFT4
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments	National Semiconductor
Output Voltage	5V	5V	5V	5V	5V	5V
Output Current	100mA	100mA	100mA	100mA	100mA	100mA
Input Voltage (Max)	33V	30V	30V	26V	26V	35V
Dropout Voltage (Max)	0.6V @ 100mA	0.45V @ 100mA	0.45V @ 100mA	0.3V @ 100mA	0.3V @ 100mA	Not Specified
Quiescent Current	1 mA	120 µA	120 µA	15 mA	1 mA	3 mA
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 85°C	-40°C to 85°C	0°C to 125°C
Package	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active	Last Time Buy	Last Time Buy	Active
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified

Engineering Selection Recommendations

Primary Substitutes (onsemi LP2950 Series): LP2950ACZ-5.0G, LP2950CZ-5.0G, LP2950ACZ-5.0RAG, and LP2950CZ-5.0RAG are recommended as primary substitutes. These parts are active products with ROHS3 compliance, improved dropout voltage performance (0.45V vs. 0.6V), and significantly lower quiescent current (120 µA vs. 1 mA). They maintain full compatibility with the -40°C to 125°C operating temperature range and TO-92-3 package. The LP2950 series offers superior power efficiency characteristics while maintaining identical output voltage and current specifications.

Secondary Substitutes (Texas Instruments LM2931 Series): LM2931AZ-5.0/NOPB and LM2931Z-5.0/NOPB are classified as last-time-buy products with ROHS3 compliance. These parts provide the lowest dropout voltage (0.3V @ 100mA) and are electrically compatible with the KA76L05ZTA. However, the operating temperature range is limited to -40°C to 85°C, which may restrict use in applications requiring the full 125°C upper limit. The LM2931Z variant offers quiescent current matching the original part (1 mA).

Alternative Substitute (National Semiconductor LM78L05ACZ/LFT4): This part provides the highest input voltage tolerance (35V maximum) and maintains active product status. It is suitable for applications with higher input voltage requirements. The operating temperature range spans 0°C to 125°C, which excludes the -40°C lower limit. This part is recommended only when input voltage exceeds 33V or when the 0°C to 125°C range is acceptable.

Packaging Variants: onsemi LP2950 parts are available in multiple packaging options (Bulk, Cut Tape). Selection between LP2950ACZ and LP2950CZ variants depends on packaging requirements; both are electrically identical with identical performance specifications.

Frequently Asked Questions (FAQ)

Q: Can LP2950 series parts directly replace the KA76L05ZTA in existing designs?

A: Yes. LP2950 series parts (LP2950ACZ-5.0G, LP2950CZ-5.0G, LP2950ACZ-5.0RAG, LP2950CZ-5.0RAG) are direct replacements. They share identical output voltage (5V), output current (100mA), TO-92-3 package configuration, and operating temperature range (-40°C to 125°C). Pin configuration and lead spacing are compatible with through-hole PCB layouts designed for the KA76L05ZTA.

Q: What is the difference between LP2950ACZ and LP2950CZ variants?

A: LP2950ACZ and LP2950CZ are electrically identical with identical electrical specifications. The difference lies in packaging: ACZ variants are supplied in bulk packaging, while CZ variants are supplied in cut tape (CT) or reel packaging. Selection depends on procurement and assembly requirements, not electrical performance.

Q: Are LM2931 series parts suitable for all applications using KA76L05ZTA?

A: LM2931 series parts are suitable for most applications but have a reduced operating temperature range (-40°C to 85°C vs. -40°C to 125°C). Applications requiring operation above 85°C must use LP2950 series or LM78L05ACZ/LFT4 alternatives. Both LM2931 variants are classified as last-time-buy, indicating limited future availability.

Q: What are the input voltage limitations for each substitute?

A: KA76L05ZTA accepts input voltages up to 33V. LP2950 series parts accept up to 30V, LM2931 series up to 26V, and LM78L05ACZ/LFT4 up to 35V. For applications with input voltages between 30V and 33V, LM78L05ACZ/LFT4 is the only substitute option. For input voltages below 26V, all substitutes are compatible.

Q: How do quiescent current differences affect circuit design?

A: LP2950 series parts consume significantly lower quiescent current (120 µA vs. 1 mA for KA76L05ZTA), reducing standby power consumption. LM2931Z-5.0/NOPB matches the original quiescent current at 1 mA. For battery-powered or low-power applications, LP2950 series provides superior efficiency. For applications where quiescent current is not a design constraint, all substitutes are functionally equivalent.

Q: What is the significance of dropout voltage differences?

A: Dropout voltage determines the minimum input-to-output voltage differential required for regulation. KA76L05ZTA has 0.6V dropout, while LP2950 series has 0.45V and LM2931 series has 0.3V. Lower dropout voltage allows operation with lower input voltages or provides better regulation margin. For applications with tight input voltage budgets, LM2931 series offers superior performance. For standard applications, all parts are compatible.

Q: Are all substitutes RoHS compliant?

A: LP2950 series and LM2931 series are ROHS3 compliant. LM78L05ACZ/LFT4 RoHS status is not specified in available documentation. For applications requiring verified RoHS compliance, LP2950 or LM2931 series are recommended.

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