AS7805AT-G1 Equivalent & Substitute Parts

Part Overview

The AS7805AT-G1 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 obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production continuity. The part delivers regulated power management functionality suitable for applications requiring stable 5V rails with moderate current demands.

Key Parameters

Parameter	Value
Manufacturer Part Number	AS7805AT-G1
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Voltage (Fixed)	5V
Output Current	1A
Input Voltage (Max)	25V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	6 mA
PSRR	70dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AS7805AT-G1 is determined by the following critical parameters:

Output voltage fixed at 5V
TO-220-3 through-hole package compatibility
Output current capacity (minimum 1A required)
Input voltage maximum rating (25V or lower acceptable)
Operating temperature range (-40°C to 125°C preferred for full compatibility)
RoHS3 compliance and REACH unaffected status

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts with identical or superior electrical specifications and the same package, enabling direct replacement without circuit modification.

Manufacturer Recommended Alternatives: Parts with enhanced current capacity or alternative protection features that provide functional equivalence while maintaining 5V fixed output and TO-220-3 packaging.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	Operating Temp Range	Product Status	Package
AS7805AT-G1	Diodes Incorporated	1A	25V	2V @ 1A (Typ)	-40°C ~ 125°C	Obsolete	TO-220-3
AS7805AT-E1	Diodes Incorporated	1A	25V	2V @ 1A (Typ)	-40°C ~ 125°C	Active	TO-220-3
TL780-05KCS	Texas Instruments	1.5A	25V	2V @ 1A	0°C ~ 125°C	Last Time Buy	TO-220-3
TL780-05KCSE3	Texas Instruments	1.5A	25V	2V @ 1A	0°C ~ 125°C	Last Time Buy	TO-220-3
UA7805CKCS	Texas Instruments	1.5A	25V	2V @ 1A	0°C ~ 125°C	Last Time Buy	TO-220-3
UA78M05CKCS	Texas Instruments	500mA	25V	2V @ 350mA	0°C ~ 125°C	Obsolete	TO-220-3
UA78M05CKCSE3	Texas Instruments	500mA	25V	2V @ 350mA	0°C ~ 125°C	Obsolete	TO-220-3
UA78M05IKCS	Texas Instruments	500mA	25V	2V @ 350mA	-40°C ~ 125°C	Obsolete	TO-220-3
UA78M05IKCSE3	Texas Instruments	500mA	25V	2V @ 350mA	-40°C ~ 125°C	Obsolete	TO-220-3
LT323AT#PBF	Analog Devices Inc.	3A	20V	Not Specified	0°C ~ 125°C	Active	TO-220-3

Engineering Selection Recommendations

Primary Recommendation: AS7805AT-E1

The AS7805AT-E1 from Diodes Incorporated is the direct parametric equivalent to the AS7805AT-G1. It maintains identical electrical specifications, the same TO-220-3 package, and identical operating temperature range (-40°C to 125°C). The critical distinction is product status: AS7805AT-E1 is active with 21,274 units in stock, whereas the AS7805AT-G1 is obsolete. This part requires no circuit redesign and provides immediate compatibility.

Secondary Recommendations: TL780-05KCS and TL780-05KCSE3

Both Texas Instruments TL780 variants offer enhanced current capacity (1.5A versus 1A) while maintaining 25V maximum input voltage and 5V fixed output. These parts are suitable for applications where additional current headroom is beneficial. Both are classified as Last Time Buy status. The TL780-05KCSE3 variant includes enhanced screening per the SE3 designation.

Alternative for Extended Temperature Range: UA78M05IKCS or UA78M05IKCSE3

For applications requiring the full -40°C to 125°C operating temperature range with lower current requirements (500mA), the UA78M05IKCS or UA78M05IKCSE3 provide temperature-matched performance. Both are obsolete status but maintain full compliance with RoHS3 and REACH requirements.

Higher Current Applications: LT323AT#PBF

The Analog Devices LT323AT#PBF delivers 3A output current in the same TO-220-3 package with active product status. This part is suitable for designs requiring significantly higher current capacity. Note the reduced maximum input voltage (20V versus 25V) requires verification against circuit design specifications.

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status consistent with the original AS7805AT-G1.

Frequently Asked Questions (FAQ)

Q: Can AS7805AT-E1 be used as a direct replacement for AS7805AT-G1?

A: Yes. The AS7805AT-E1 is a parametric equivalent with identical electrical specifications, package, and operating temperature range. No circuit modifications are required. The primary difference is product status: AS7805AT-E1 is active with higher inventory availability.

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

A: Both parts are electrically identical with 1.5A output current and 25V maximum input voltage. The SE3 designation indicates enhanced screening and testing per Texas Instruments specifications. Selection depends on application reliability requirements.

Q: Can I use UA78M05 series parts as substitutes for the AS7805AT-G1?

A: UA78M05 series parts have reduced output current capacity (500mA versus 1A). These are suitable only for applications where the lower current rating is acceptable. The AS7805AT-E1 or TL780 series are preferred for maintaining the original 1A specification.

Q: Is the LT323AT#PBF compatible with the AS7805AT-G1 circuit?

A: The LT323AT#PBF provides 3A output current in the same TO-220-3 package with 5V fixed output. However, the maximum input voltage is 20V versus 25V for the original part. Verify that your circuit input voltage does not exceed 20V before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and REACH unaffected status, consistent with the original AS7805AT-G1 specifications.

Q: What should I consider when selecting between active and Last Time Buy parts?

A: Active parts (AS7805AT-E1, LT323AT#PBF) offer ongoing availability and support. Last Time Buy parts (TL780 series, UA7805CKCS) have limited remaining inventory. For new designs or long-term production, active parts are recommended. For legacy system support, Last Time Buy parts may be acceptable if inventory is secured.

Q: Can I substitute a higher current part in place of the AS7805AT-G1?

A: Yes. Parts with equal or higher current ratings (TL780 series at 1.5A, LT323AT#PBF at 3A) are suitable substitutes. The circuit will operate within the original 1A specification while providing additional current capacity margin. No circuit modification is required.

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