KA78L05AMTF Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The KA78L05AMTF is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 100mA in a surface-mount SOT-89-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The KA78L05AMTF serves as a positive fixed output voltage regulator with integrated over-temperature and short-circuit protection, suitable for low-power applications requiring stable 5V regulation from input sources up to 30V.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	5V
Voltage - Input (Max)	30V
Current - Output	100mA
Current - Quiescent (Iq)	5.5 mA
PSRR	80dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-243AA
Supplier Device Package	SOT-89-3
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the KA78L05AMTF are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Output Voltage: Fixed 5V output (all substitutes maintain this specification)
Output Current: 100mA capability (all substitutes rated for 100mA minimum)
Package Type: TO-243AA / SOT-89-3 surface-mount package (mechanical compatibility)
Input Voltage Range: Maximum 20V to 30V input capability
Operating Temperature Range: Minimum -40°C to 0°C lower bound; maximum 125°C upper bound
Protection Features: Over-temperature and short-circuit protection (baseline requirement)

Substitutes are classified into two categories:

Direct Substitutes (Texas Instruments UA78L05 series): Functionally equivalent with identical output specifications, same package, and active product status. These parts are recommended for direct replacement with consideration for operating temperature range and input voltage limits.

Similar Substitutes (onsemi MC78L05, STMicroelectronics L78L05, MAXVISION L78L05, Rohm BD50FA1, Micro Commercial MC78L05): Parts meeting core electrical requirements (5V, 100mA, SOT-89-3) with variations in quiescent current, PSRR, input voltage limits, or operating temperature ranges. These require design verification for specific application parameters.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Input (Max)	Voltage - Output	Current - Output	Current - Quiescent (Iq)	PSRR (120Hz)	Operating Temperature	Package	Protection Features
KA78L05AMTF	onsemi	Obsolete	30V	5V	100mA	5.5 mA	80dB	-40°C ~ 125°C	SOT-89-3	Over Temperature, Short Circuit
UA78L05ACPK	Texas Instruments	Active	20V	5V	100mA	—	49dB	0°C ~ 125°C	SOT-89-3	Over Current, Over Temperature, Reverse Polarity, Short Circuit
UA78L05ACPKG3	Texas Instruments	Active	20V	5V	100mA	—	49dB	0°C ~ 125°C	SOT-89-3	Over Current, Over Temperature, Reverse Polarity, Short Circuit
UA78L05AIPK	Texas Instruments	Active	20V	5V	100mA	—	49dB	-40°C ~ 125°C	SOT-89-3	Over Current, Over Temperature, Reverse Polarity, Short Circuit
UA78L05AIPKG3	Texas Instruments	Active	20V	5V	100mA	—	49dB	-40°C ~ 125°C	SOT-89-3	Over Current, Over Temperature, Reverse Polarity, Short Circuit
MC78L05ACHT1G	onsemi	Active	30V	5V	100mA	6 mA	49dB	0°C ~ 125°C	SOT-89-3	Over Temperature, Short Circuit
L78L05ABUTR	MAXVISION	Active	30V	5V	100mA	5.5 mA	49dB	-40°C ~ 125°C	SOT-89-3	Over Current, Over Temperature, Short Circuit
L78L05ACUTR	STMicroelectronics	Active	30V	5V	100mA	5.5 mA	49dB	0°C ~ 125°C	SOT-89-3	Over Current, Over Temperature, Short Circuit
BD50FA1FP3-ZTL	Rohm Semiconductor	Active	25V	5V	100mA	—	—	-25°C ~ 85°C	SOT-89-3	Over Current, Over Temperature, Soft Start
MC78L05F-TP	Micro Commercial Co	Active	30V	5V	100mA	5.5 mA	80dB	0°C ~ 125°C	SOT-89-3	Over Temperature, Short Circuit
UA78L05CPKG3	Texas Instruments	Active	20V	5V	100mA	—	49dB	0°C ~ 125°C	SOT-89-3	Over Current, Over Temperature, Reverse Polarity, Short Circuit

Engineering Selection Recommendations

For applications requiring full -40°C to 125°C operating temperature coverage:

UA78L05AIPK and UA78L05AIPKG3 (Texas Instruments) are active products matching the original temperature range. These parts include reverse polarity protection and over-current protection in addition to the baseline over-temperature and short-circuit protection. The 20V maximum input voltage is suitable for applications where input does not exceed this limit. Both parts are RoHS3 compliant with MSL-2 moisture sensitivity.

L78L05ABUTR (MAXVISION) maintains the 30V input capability and -40°C to 125°C operating range with 5.5mA quiescent current matching the original specification. This part is active and RoHS3 compliant.

For applications with 0°C to 125°C operating temperature requirement:

UA78L05ACPK, UA78L05ACPKG3, and UA78L05CPKG3 (Texas Instruments) are suitable direct replacements with active product status and RoHS3 compliance. These parts provide enhanced protection features including reverse polarity and over-current protection. Input voltage is limited to 20V maximum.

MC78L05ACHT1G (onsemi) is an active product from the original manufacturer with 30V input capability and 0°C to 125°C operating range. This part maintains compatibility with the original device family.

L78L05ACUTR (STMicroelectronics) and MC78L05F-TP (Micro Commercial Co) are active alternatives with 30V input capability, matching the original quiescent current specification, and RoHS3 compliance.

For applications with restricted temperature range (-25°C to 85°C):

BD50FA1FP3-ZTL (Rohm Semiconductor) is an active product with 25V input capability and integrated soft-start protection. This part is suitable only for applications operating within the -25°C to 85°C range.

Compliance and Certification:

All recommended substitute parts are RoHS3 compliant and REACH unaffected. All parts carry EAR99 ECCN classification and HTSUS code 8542.39.0001, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can UA78L05AIPK replace KA78L05AMTF in all applications?

A: UA78L05AIPK is suitable for applications where input voltage does not exceed 20V. The original KA78L05AMTF accepts input up to 30V. If your application requires 20V to 30V input capability, select L78L05ABUTR, L78L05ACUTR, MC78L05ACHT1G, or MC78L05F-TP instead. UA78L05AIPK provides superior protection features (reverse polarity, over-current) and is an active product with full -40°C to 125°C temperature coverage.

Q: What is the difference between UA78L05AIPK and UA78L05AIPKG3?

A: Both parts are electrically identical with identical specifications. The difference is packaging: UA78L05AIPK is supplied in Cut Tape (CT) & Digi-Reel format, while UA78L05AIPKG3 is supplied in Tape & Reel (TR) format. Select based on your procurement and assembly requirements.

Q: Is MC78L05ACHT1G a direct replacement for KA78L05AMTF?

A: MC78L05ACHT1G is from the same manufacturer (onsemi) and maintains the 30V input capability and 5V/100mA output specifications. However, the operating temperature range is 0°C to 125°C versus the original -40°C to 125°C. If your application requires operation below 0°C, select UA78L05AIPK, UA78L05AIPKG3, or L78L05ABUTR instead.

Q: Why do some substitutes show lower PSRR (49dB vs 80dB)?

A: PSRR (Power Supply Rejection Ratio) indicates the regulator's ability to reject power supply noise. The original KA78L05AMTF and some substitutes (MC78L05F-TP) specify 80dB at 120Hz. Other active substitutes specify 49dB. For applications sensitive to power supply noise, prioritize parts with 80dB PSRR specification.

Q: Can I use BD50FA1FP3-ZTL if my application operates at -40°C?

A: No. BD50FA1FP3-ZTL is rated for -25°C to 85°C operation only. For -40°C operation, select UA78L05AIPK, UA78L05AIPKG3, or L78L05ABUTR.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant. The original KA78L05AMTF does not specify RoHS status. All substitutes carry REACH Unaffected status matching the original part.

Q: What is the significance of MSL (Moisture Sensitivity Level)?

A: MSL indicates the maximum time a component can be exposed to ambient conditions before soldering. KA78L05AMTF specifies MSL-1 (unlimited). Most substitutes specify MSL-2 (1 Year) or MSL-3 (168 Hours). For long-term storage, verify that your procurement and assembly timeline aligns with the MSL rating of your selected substitute.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message