LM78L15ACMX Equivalent & Substitute Parts

Part Overview

The LM78L15ACMX is a linear voltage regulator IC from Texas Instruments designed for positive fixed 15V output applications with 100mA current capacity in an 8-SOIC surface mount package. This device is classified as Last Time Buy, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts ensures design continuity and supply chain flexibility for applications requiring 15V fixed output regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	15V
Output Current	100mA
Input Voltage (Max)	35V
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 125°C
Protection Features	Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LM78L15ACMX is determined by strict equivalence in the following parameters:

Fixed output voltage of 15V
Output current rating of 100mA
8-SOIC package footprint compatibility
Surface mount mounting type
ROHS3 compliance
Operating temperature range of 0°C ~ 125°C or extended range

Parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended substitutes (functionally equivalent with minor specification variations). All listed substitutes maintain the core electrical characteristics required for direct replacement in 15V, 100mA linear regulation applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Input Voltage (Max)	Output Voltage	Output Current	Quiescent Current	PSRR (120Hz)	Operating Temp	Protection Features
LM78L15ACMX	Texas Instruments	Last Time Buy	35V	15V	100mA	3mA	51dB	0°C ~ 125°C	Over Temperature, Short Circuit
LM78L15ACMX/NOPB	Texas Instruments	Active	35V	15V	100mA	3mA	51dB	0°C ~ 125°C	Over Temperature, Short Circuit
UA78L15ACDR	Texas Instruments	Active	30V	15V	100mA	—	39dB	0°C ~ 125°C	Over Current, Over Temperature, Reverse Polarity, Short Circuit
L78L15ACD13TR	STMicroelectronics	Active	35V	15V	100mA	6mA	39dB	0°C ~ 125°C	Over Current, Over Temperature, Short Circuit
L78L15CD-TR	STMicroelectronics	Active	35V	15V	100mA	5.5mA	39dB	0°C ~ 125°C	Over Current, Over Temperature, Short Circuit
MC78L15ABDR2G	onsemi	Active	35V	15V	100mA	6.5mA	39dB	-40°C ~ 125°C	Over Temperature, Short Circuit
MC78L15ACDR2G	onsemi	Active	35V	15V	100mA	6.5mA	39dB	0°C ~ 125°C	Over Temperature, Short Circuit
NCV78L15ABDR2G	onsemi	Active	35V	15V	100mA	6.5mA	39dB	-40°C ~ 125°C	Over Temperature, Short Circuit
UA78L15ACD	Texas Instruments	Obsolete	30V	15V	100mA	—	39dB	0°C ~ 125°C	Over Current, Over Temperature, Reverse Polarity, Short Circuit

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement): LM78L15ACMX/NOPB is the active production equivalent with identical electrical specifications and is the primary choice for direct substitution. Both parts share the same base product number (LM78L15), input voltage rating (35V), quiescent current (3mA), and PSRR performance (51dB).

Active Manufacturer Alternatives: STMicroelectronics L78L15ACD13TR and L78L15CD-TR are active production parts with 35V input rating and identical output specifications. These parts feature enhanced protection (Over Current) compared to the original LM78L15ACMX. Quiescent current is higher (5.5–6mA) but remains within acceptable limits for most applications.

onsemi Alternatives: MC78L15ACDR2G and MC78L15ABDR2G maintain 35V input rating and 100mA output. MC78L15ABDR2G extends operating temperature to -40°C ~ 125°C for applications requiring low-temperature performance. NCV78L15ABDR2G is automotive-grade (AEC-Q100 qualified) with extended temperature range, suitable for automotive and industrial environments.

Avoid: UA78L15ACDR and UA78L15ACD have reduced maximum input voltage (30V vs. 35V) and should only be selected if the application input voltage does not exceed 30V. UA78L15ACD is obsolete and not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use LM78L15ACMX/NOPB as a direct replacement for LM78L15ACMX? A: Yes. LM78L15ACMX/NOPB is the active production equivalent with identical electrical and mechanical specifications. The "/NOPB" suffix indicates lead-free plating and is functionally equivalent.

Q: What is the difference between the STMicroelectronics L78L15 variants? A: L78L15ACD13TR and L78L15CD-TR are functionally equivalent with identical 35V input and 15V output ratings. The primary difference is packaging: L78L15ACD13TR is supplied in Cut Tape & Digi-Reel format, while L78L15CD-TR is supplied in Tape & Reel format. Quiescent current differs slightly (6mA vs. 5.5mA) but both are acceptable for standard applications.

Q: Can I use MC78L15ABDR2G in place of LM78L15ACMX? A: Yes, with consideration for operating temperature. MC78L15ABDR2G extends the lower operating limit to -40°C, making it suitable for wider temperature ranges. All other electrical parameters are compatible. Verify that your application does not require the higher PSRR (51dB) of the original part; MC78L15ABDR2G provides 39dB.

Q: What is the difference between MC78L15ACDR2G and MC78L15ABDR2G? A: Both parts are from onsemi with identical electrical specifications. MC78L15ABDR2G operates from -40°C ~ 125°C, while MC78L15ACDR2G operates from 0°C ~ 125°C. Select MC78L15ABDR2G for applications requiring extended low-temperature performance.

Q: Is NCV78L15ABDR2G suitable for my application? A: NCV78L15ABDR2G is automotive-grade (AEC-Q100 qualified) with -40°C ~ 125°C operating range. It is suitable for automotive, industrial, and harsh-environment applications. Electrical specifications are identical to MC78L15ABDR2G. Use this part only if automotive qualification is required.

Q: Why do some substitutes have lower maximum input voltage (30V vs. 35V)? A: UA78L15ACDR and UA78L15ACD are rated for 30V maximum input. These parts are suitable only for applications where input voltage does not exceed 30V. For applications requiring the full 35V input rating, select alternatives with 35V rating.

Q: Can I use parts with different quiescent current ratings? A: Yes. Quiescent current differences (3mA to 6.5mA) are acceptable for most applications. Higher quiescent current results in slightly increased standby power consumption. Verify that your power budget accommodates the higher value if selecting parts with 6–6.5mA quiescent current.

Q: Are all listed parts ROHS3 compliant? A: Yes. All parts listed are ROHS3 compliant and suitable for applications requiring lead-free components.

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