UA7805CKCS Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The UA7805CKCS is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed positive 5V output at 1.5A in a TO-220-3 package. This device is classified as Last Time Buy, indicating limited availability from the original manufacturer. Finding equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	UA7805CKCS
Output Voltage	5V Fixed
Output Current	1.5A
Input Voltage (Max)	25V
Voltage Dropout	2V @ 1A
Package	TO-220-3
Operating Temperature	0°C ~ 125°C
Protection Features	Over Temperature, Reverse Polarity
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the UA7805CKCS is determined by the following critical parameters:

Output voltage: 5V fixed
Output current capability: minimum 1.5A
Package type: TO-220-3
Input voltage tolerance: maximum 25V or higher
Operating temperature range: 0°C to 125°C or wider
Protection features: Over temperature protection required
RoHS compliance: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (1.5A Output Current) Parts with 1.5A output current matching the original specification, suitable for direct replacement without circuit modification.

Category 2: Functional Alternatives (1.0A to 1.2A Output Current) Parts with reduced output current (1.0A to 1.2A) that maintain 5V fixed output and TO-220-3 packaging. These are suitable for applications where the full 1.5A is not required or where lower quiescent current is beneficial.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout	Operating Temp	Product Status	Quiescent Current
UA7805CKCS	Texas Instruments	1.5A	25V	2V @ 1A	0°C ~ 125°C	Last Time Buy	—
LM7805CT/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	0°C ~ 125°C	Active	6 mA
LM340AT-5.0/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	0°C ~ 125°C	Active	6 mA
LM340T-5.0/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	0°C ~ 125°C	Active	8 mA
L7805CV	UMW	1.2A	35V	—	-40°C ~ 105°C	Active	6 mA
MC7805BTG	onsemi	1A	35V	2V @ 1A (Typ)	-40°C ~ 125°C	Active	8 mA
MC7805CTG	onsemi	1A	35V	2V @ 1A (Typ)	0°C ~ 125°C	Active	6.5 mA
AS7805AT-E1	Diodes Incorporated	1A	25V	2V @ 1A (Typ)	-40°C ~ 125°C	Active	6 mA
LM2940CT-5.0/NOPB	Texas Instruments	1A	26V	1V @ 1A	0°C ~ 125°C	Active	15 mA
LM2940T-5.0/NOPB	Texas Instruments	1A	26V	1V @ 1A	-40°C ~ 125°C	Active	10 mA

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement - 1.5A Output)

LM7805CT/NOPB, LM340AT-5.0/NOPB, and LM340T-5.0/NOPB are all manufactured by Texas Instruments and maintain the 1.5A output current specification. These parts are in Active product status with established supply availability. All three are ROHS3 compliant and suitable for direct circuit substitution. LM7805CT/NOPB offers the lowest quiescent current at 6 mA and higher input voltage tolerance (35V vs. 25V), making it the preferred primary substitute.

Secondary Substitutes (Reduced Current - 1.0A to 1.2A Output)

MC7805BTG, MC7805CTG, and AS7805AT-E1 provide 1.0A output current with Active product status. These are suitable when circuit design permits reduced output current or when lower quiescent current is advantageous. MC7805BTG and MC7805CTG are manufactured by onsemi with extended temperature ranges (-40°C to 125°C). AS7805AT-E1 from Diodes Incorporated matches the original 25V maximum input voltage specification.

L7805CV from UMW provides 1.2A output current and is in Active status with high inventory availability. This part operates at -40°C to 105°C, which is narrower than the original at the upper temperature limit.

Low Dropout Alternatives

LM2940CT-5.0/NOPB and LM2940T-5.0/NOPB feature reduced voltage dropout (1V @ 1A vs. 2V @ 1A), beneficial for applications with tight input voltage margins. Both are in Active status and ROHS3 compliant. LM2940T-5.0/NOPB extends the operating temperature to -40°C to 125°C. These parts are suitable when lower dropout performance is required, though output current is limited to 1A.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A rated regulator as a direct replacement for the UA7805CKCS rated at 1.5A?

A: Only if your circuit design does not require the full 1.5A output current. Parts such as MC7805BTG, MC7805CTG, and AS7805AT-E1 are rated for 1A continuous output. Verify that your maximum load current does not exceed 1A. If your application requires 1.5A, use LM7805CT/NOPB, LM340AT-5.0/NOPB, or LM340T-5.0/NOPB.

Q: What is the difference between the LM340 and LM7805 series?

A: Both are fixed 5V linear regulators in TO-220-3 packaging with identical electrical performance for this application. The LM340 is an older designation; the LM7805 is the modern equivalent. Both are manufactured by Texas Instruments and are functionally interchangeable at 1.5A output.

Q: Why do some substitutes have lower quiescent current specifications?

A: Quiescent current (Iq) is the current drawn by the regulator itself when no load is connected. Lower quiescent current reduces standby power consumption. Parts like LM7805CT/NOPB (6 mA) consume less standby power than LM2940CT-5.0/NOPB (15 mA), though the LM2940 series offers superior dropout voltage performance.

Q: Is the AS7805AT-E1 suitable if my input voltage is limited to 25V?

A: Yes. AS7805AT-E1 is rated for maximum input voltage of 25V, matching the original UA7805CKCS specification. This part is suitable for applications where input voltage does not exceed 25V. Other substitutes rated for 35V input voltage provide additional margin but are not required if your design operates below 25V.

Q: Can I use the LM2940T-5.0/NOPB in place of the UA7805CKCS?

A: LM2940T-5.0/NOPB is suitable only if your circuit permits 1A maximum output current and benefits from the lower 1V dropout voltage. The LM2940 series is optimized for low-dropout applications. If your design requires 1.5A output, this part is not appropriate. Verify load current requirements before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the environmental compliance of the original UA7805CKCS.

Q: What is the temperature range difference between MC7805BTG and MC7805CTG?

A: MC7805BTG operates from -40°C to 125°C, while MC7805CTG operates from 0°C to 125°C. Both are manufactured by onsemi. Select MC7805BTG if your application requires operation below 0°C; otherwise, MC7805CTG is suitable.

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