AS7805AT-E1 Equivalent & Substitute Parts

Part Overview

The AS7805AT-E1 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed positive 5V output at 1A current capacity in a TO-220-3 through-hole package. This device is classified as active product status and is widely used in power management applications requiring stable 5V regulation from input sources up to 25V.

Substitute parts are necessary when the AS7805AT-E1 becomes unavailable, when higher current capacity is required, or when alternative manufacturer sourcing is needed for supply chain continuity. The substitute parts listed maintain electrical compatibility through matching output voltage, package type, and core regulatory functionality while offering variations in current capacity and protection features.

Key Parameters

Parameter	AS7805AT-E1
Manufacturer	Diodes Incorporated
Output Voltage (Fixed)	5V
Output Current	1A
Input Voltage (Max)	25V
Voltage Dropout (Max)	2V @ 1A (Typ)
Package / Case	TO-220-3
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the AS7805AT-E1 is determined by the following critical parameters:

Fixed Parameters (Must Match):

Output voltage: 5V fixed
Package type: TO-220-3
Mounting type: Through hole
Output configuration: Positive

Flexible Parameters (May Vary):

Output current capacity: 1A or higher
Input voltage maximum: 20V or higher
Operating temperature range: Must encompass application requirements
Protection features: May include additional protections
Manufacturer: Alternative sources acceptable

The substitute parts are grouped into two categories based on current capacity:

Category 1 - Higher Current Capacity (1.5A): TL780-05KCS, TL780-05KCSE3, UA7805CKCS. These parts provide increased current handling while maintaining the same 5V output and TO-220-3 package, suitable for applications requiring more than 1A.

Category 2 - Lower Current Capacity (500mA) or Higher Current (3A): UA78M05CKCS, UA78M05CKCSE3, UA78M05IKCS, UA78M05IKCSE3 (500mA variants), and LT323AT#PBF (3A variant). These address specific current requirements or extended temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Operating Temperature	Product Status	Protection Features
AS7805AT-E1	Diodes Incorporated	1A	25V	-40°C ~ 125°C	Active	Over Temperature, Short Circuit
LT323AT#PBF	Analog Devices Inc.	3A	20V	0°C ~ 125°C	Active	Over Current, Over Temperature
TL780-05KCS	Texas Instruments	1.5A	25V	0°C ~ 125°C	Last Time Buy	Over Current, Over Temperature, Reverse Polarity, Short Circuit
TL780-05KCSE3	Texas Instruments	1.5A	25V	0°C ~ 125°C	Last Time Buy	Over Current, Over Temperature, Reverse Polarity, Short Circuit
UA7805CKCS	Texas Instruments	1.5A	25V	0°C ~ 125°C	Last Time Buy	Over Temperature, Reverse Polarity
UA78M05CKCS	Texas Instruments	500mA	25V	0°C ~ 125°C	Obsolete	Over Current, Over Temperature, Short Circuit
UA78M05CKCSE3	Texas Instruments	500mA	25V	0°C ~ 125°C	Obsolete	Over Current, Over Temperature, Short Circuit
UA78M05IKCS	Texas Instruments	500mA	25V	-40°C ~ 125°C	Obsolete	Over Current, Over Temperature, Short Circuit
UA78M05IKCSE3	Texas Instruments	500mA	25V	-40°C ~ 125°C	Obsolete	Over Current, Over Temperature, Short Circuit

Engineering Selection Recommendations

For Direct Replacement (Active Product Status): LT323AT#PBF from Analog Devices Inc. is the only active substitute with higher current capacity (3A). This part is suitable when the AS7805AT-E1 is unavailable and the application can tolerate a reduced maximum input voltage (20V vs. 25V) and narrower operating temperature range (0°C ~ 125°C vs. -40°C ~ 125°C).

For Extended Availability (Last Time Buy Status): TL780-05KCS and TL780-05KCSE3 from Texas Instruments provide 1.5A output current with matching 25V input voltage rating and extended protection features including reverse polarity protection. These parts maintain compatibility with the AS7805AT-E1 electrical specifications but are designated Last Time Buy, indicating limited future availability.

UA7805CKCS from Texas Instruments offers 1.5A output current and 25V input voltage rating with Last Time Buy status. This part provides a middle-ground option between the original 1A specification and higher-capacity alternatives.

For Legacy or Specialized Applications: UA78M05 series variants (CKCS, CKCSE3, IKCS, IKCSE3) are designated Obsolete and should only be considered when existing designs specifically require their 500mA current rating or extended temperature range (-40°C ~ 125°C for I-grade variants). These parts are not recommended for new designs.

Compliance Considerations: All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the AS7805AT-E1 regulatory requirements. All parts are packaged in TO-220-3 through-hole configuration, ensuring mechanical compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can LT323AT#PBF be used as a direct drop-in replacement for AS7805AT-E1?

A: LT323AT#PBF is mechanically compatible (TO-220-3 package) and electrically compatible for the 5V output specification. However, the reduced maximum input voltage (20V vs. 25V) and narrower operating temperature range (0°C ~ 125°C vs. -40°C ~ 125°C) must be verified against your application requirements before substitution.

Q: What is the difference between TL780-05KCS and TL780-05KCSE3?

A: Both parts are electrically identical with 1.5A output current, 25V input voltage, and matching protection features. The primary difference is packaging designation; both are suitable for the same applications and are interchangeable from an electrical standpoint.

Q: Why are UA78M05 series parts listed as Obsolete?

A: UA78M05 series variants have been discontinued by Texas Instruments. These parts are included in the substitute list because they appear in the AS7805AT-E1 cross-reference documentation, but they should not be selected for new designs due to limited availability and no future manufacturing.

Q: Can I use a 500mA part (UA78M05 series) if my application only requires 1A maximum?

A: No. The UA78M05 series is rated for 500mA maximum output current, which is insufficient for applications requiring 1A. Using an undersized regulator will result in current limiting and potential thermal shutdown.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the AS7805AT-E1 regulatory requirements for environmental and hazardous substance restrictions.

Q: What is the significance of the "I" grade designation in UA78M05IKCS and UA78M05IKCSE3?

A: The "I" grade indicates an extended operating temperature range of -40°C ~ 125°C, compared to the standard 0°C ~ 125°C range of "C" grade variants. This extended range is necessary for industrial or automotive applications requiring operation at lower ambient temperatures.

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