UA78L05CDG4 Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The UA78L05CDG4 is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed positive 5V output at 100mA. This device is classified as a Power Management PMIC and is packaged in 8-SOIC surface mount configuration. The UA78L05CDG4 is currently in Last Time Buy status, indicating limited availability. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	5V
Voltage - Input (Max)	20V
Current - Output	100mA
Voltage Dropout (Max)	1.7V @ 40mA
PSRR	49dB (120Hz)
Operating Temperature	0°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the UA78L05CDG4 is determined by the following critical parameters: fixed 5V output voltage, 100mA output current capability, 8-SOIC package configuration, surface mount mounting type, and ROHS3 compliance. Substitute parts must maintain identical output voltage and current specifications to ensure functional compatibility within existing circuit designs.

Substitute parts are grouped into two categories:

Manufacturer Recommended Substitutes (MFR Recommended): Parts that are actively produced and recommended by manufacturers as direct replacements. These include UA78L05ACDR, LM78L05ACM/NOPB, LM78L05ACMX/NOPB, and variants from STMicroelectronics and onsemi.

Parametric Equivalents: Parts that meet the core electrical specifications but may differ in secondary parameters such as maximum input voltage, dropout voltage, or quiescent current. These include UA78L05ACD and UA78L05CD.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Input (Max)	Voltage - Output	Current - Output	Voltage Dropout (Max)	PSRR	Operating Temperature	Package	Protection Features
UA78L05CDG4	Texas Instruments	Last Time Buy	20V	5V	100mA	1.7V @ 40mA	49dB (120Hz)	0°C ~ 125°C	8-SOIC	Over Current, Over Temperature, Reverse Polarity, Short Circuit
UA78L05ACDR	Texas Instruments	Active	20V	5V	100mA	1.7V @ 40mA	49dB (120Hz)	0°C ~ 125°C	8-SOIC	Over Current, Over Temperature, Reverse Polarity, Short Circuit
LM78L05ACM/NOPB	Texas Instruments	Active	35V	5V	100mA	—	62dB (120Hz)	0°C ~ 125°C	8-SOIC	Over Temperature, Short Circuit
LM78L05ACMX/NOPB	Texas Instruments	Active	35V	5V	100mA	—	62dB (120Hz)	0°C ~ 125°C	8-SOIC	Over Temperature, Short Circuit
UA78L05ACD	Texas Instruments	Active	20V	5V	100mA	1.7V @ 40mA	49dB (120Hz)	0°C ~ 125°C	8-SOIC	Over Current, Over Temperature, Reverse Polarity, Short Circuit
UA78L05CD	Texas Instruments	Last Time Buy	20V	5V	100mA	1.7V @ 40mA	49dB (120Hz)	0°C ~ 125°C	8-SOIC	Over Current, Over Temperature, Reverse Polarity, Short Circuit
L78L05ABD13TR	STMicroelectronics	Active	30V	5V	100mA	—	49dB (120Hz)	-40°C ~ 125°C	8-SOIC	Over Current, Over Temperature, Short Circuit
L78L05ACD13TR	STMicroelectronics	Active	30V	5V	100mA	—	49dB (120Hz)	0°C ~ 125°C	8-SOIC	Over Current, Over Temperature, Short Circuit
L78L05CD13TR	STMicroelectronics	Active	30V	5V	100mA	—	49dB (120Hz)	0°C ~ 125°C	8-SOIC	Over Current, Over Temperature, Short Circuit
MC78L05ABDR2G	onsemi	Active	30V	5V	100mA	—	49dB (120Hz)	-40°C ~ 125°C	8-SOIC	Over Temperature, Short Circuit
MC78L05ACDR2G	onsemi	Active	30V	5V	100mA	—	49dB (120Hz)	0°C ~ 125°C	8-SOIC	Over Temperature, Short Circuit

Engineering Selection Recommendations

Primary Recommendation: UA78L05ACDR (Texas Instruments) is the preferred substitute. It maintains identical electrical specifications to the UA78L05CDG4, including 20V maximum input voltage, 1.7V dropout voltage, and comprehensive protection features. This part is in Active product status with high inventory availability (40,200 units), ensuring long-term supply continuity.

Secondary Recommendations: LM78L05ACM/NOPB and LM78L05ACMX/NOPB (Texas Instruments) are suitable alternatives with enhanced specifications. These parts support higher input voltage (35V maximum) and improved PSRR (62dB), providing additional design margin. Both are in Active status with substantial inventory.

Cross-Manufacturer Alternatives: L78L05ACD13TR (STMicroelectronics) and MC78L05ACDR2G (onsemi) are functionally equivalent substitutes. These parts support higher input voltage (30V) and maintain the required 5V output and 100mA current capability. Both manufacturers provide ROHS3 compliance and active product support.

Avoid: UA78L05CD remains in Last Time Buy status and should not be selected for new designs despite functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can I substitute UA78L05CDG4 with LM78L05ACM/NOPB? A: Yes. Both devices provide 5V fixed output at 100mA in 8-SOIC package. LM78L05ACM/NOPB offers higher input voltage tolerance (35V vs. 20V) and improved PSRR (62dB vs. 49dB), making it a superior choice for applications with variable input voltage or noise-sensitive circuits.

Q: What is the difference between UA78L05ACDR and UA78L05ACD? A: Both parts are electrically identical with matching specifications. The primary difference is packaging: UA78L05ACDR is supplied in Cut Tape (CT) & Digi-Reel format, while UA78L05ACD is supplied in Tube format. Selection depends on assembly process requirements.

Q: Are STMicroelectronics L78L05 series parts compatible with Texas Instruments UA78L05? A: Yes. L78L05ACD13TR and L78L05CD13TR are functionally compatible substitutes. Both provide 5V output at 100mA in 8-SOIC package. STMicroelectronics parts support higher input voltage (30V) and extended temperature range (-40°C to 125°C for some variants), offering improved performance margins.

Q: Can I use MC78L05ACDR2G (onsemi) as a direct replacement? A: Yes. MC78L05ACDR2G is a direct functional equivalent with 5V output, 100mA current, and 8-SOIC package. It supports 30V input voltage and is in Active production status. Operating temperature range is 0°C to 125°C, matching the original specification.

Q: Why do some substitute parts have different maximum input voltages? A: Different manufacturers design their regulators with varying input voltage ratings. LM78L05 series supports 35V input, while L78L05 and MC78L05 series support 30V. The UA78L05 is rated at 20V. All are suitable for applications within their respective input voltage limits.

Q: What packaging options are available for substitutes? A: Substitute parts are available in Cut Tape (CT) & Digi-Reel format for high-volume automated assembly, or Tube format for lower-volume manual assembly. Selection depends on production volume and assembly equipment compatibility.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring compatibility with environmental and regulatory requirements.

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