LM78L15ACM Linear Voltage Regulator 15V 100mA Equivalent & Substitute Parts

Part Overview

The LM78L15ACM is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. It delivers a fixed 15V output at 100mA maximum current in an 8-SOIC surface mount package. The 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 and maintain supply chain flexibility for production and maintenance applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	15V
Output Current	100mA
Input Voltage (Max)	35V
Output Configuration	Positive
Number of Regulators	1
Quiescent Current (Iq)	3mA
PSRR	51dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM78L15ACM is determined by the following critical parameters:

Output Voltage: Must be fixed at 15V
Output Current Capability: Minimum 100mA
Input Voltage Rating: Must support up to 35V maximum input
Package Type: 8-SOIC surface mount package (0.154", 3.90mm Width)
Output Configuration: Positive fixed output
Regulatory Compliance: ROHS3 compliant

Substitute parts are grouped into two categories based on availability and product status:

Category 1 - Direct Equivalents (Active Status): Parts with identical or superior electrical specifications and active product status from major manufacturers.

Category 2 - Functional Equivalents (Specialized Applications): Parts meeting core substitution criteria with variations in quiescent current, PSRR, or operating temperature range suitable for specific design requirements.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Iq (mA)	PSRR (dB)	Package	Operating Temp	Product Status
LM78L15ACM	Texas Instruments	15V	100mA	35V	3	51 (120Hz)	8-SOIC	0°C ~ 125°C	Last Time Buy
LM78L15ACM/NOPB	Texas Instruments	15V	100mA	35V	3	51 (120Hz)	8-SOIC	0°C ~ 125°C	Active
UA78L15ACDR	Texas Instruments	15V	100mA	30V	—	39 (120Hz)	8-SOIC	0°C ~ 125°C	Active
L78L15ACD13TR	STMicroelectronics	15V	100mA	35V	6	39 (120Hz)	8-SOIC	0°C ~ 125°C	Active
L78L15ACZ	STMicroelectronics	15V	100mA	35V	6	39 (120Hz)	TO-92-3	0°C ~ 125°C	Active
L78L15CD-TR	STMicroelectronics	15V	100mA	35V	5.5	39 (120Hz)	8-SOIC	0°C ~ 125°C	Active
MC78L15ABDR2G	onsemi	15V	100mA	35V	6.5	39 (120Hz)	8-SOIC	-40°C ~ 125°C	Active
MC78L15ACDR2G	onsemi	15V	100mA	35V	6.5	39 (120Hz)	8-SOIC	0°C ~ 125°C	Active
NCV78L15ABDR2G	onsemi	15V	100mA	35V	6.5	39 (120Hz)	8-SOIC	-40°C ~ 125°C	Active
UA78L15ACD	Texas Instruments	15V	100mA	30V	—	39 (120Hz)	8-SOIC	0°C ~ 125°C	Obsolete

Engineering Selection Recommendations

Primary Recommendation: LM78L15ACM/NOPB (Texas Instruments)

This part is the direct equivalent with identical electrical specifications and active product status. It maintains the same 3mA quiescent current and 51dB PSRR performance as the original LM78L15ACM. Both parts are ROHS3 compliant and suitable for direct substitution in existing designs.

Secondary Recommendations for Active Supply:

L78L15CD-TR (STMicroelectronics) and L78L15ACD13TR (STMicroelectronics) are functionally equivalent with 35V maximum input rating matching the original specification. These parts feature slightly higher quiescent current (5.5mA and 6mA respectively) and lower PSRR (39dB), but remain suitable for applications where the original performance margin is not critical.

MC78L15ACDR2G (onsemi) provides equivalent performance with active product status and standard operating temperature range (0°C ~ 125°C). The MC78L15ABDR2G variant extends the operating temperature to -40°C ~ 125°C for applications requiring enhanced low-temperature performance.

Specialized Application: NCV78L15ABDR2G (onsemi)

This part carries AEC-Q100 automotive qualification and extended temperature range (-40°C ~ 125°C). Selection is appropriate for automotive or industrial applications requiring automotive-grade components.

Not Recommended: UA78L15ACD (Texas Instruments)

This part is classified as Obsolete and carries reduced maximum input voltage (30V versus 35V). Avoid selection for new designs or long-term supply requirements.

Frequently Asked Questions (FAQ)

Q: Can I use L78L15ACZ (TO-92-3 package) as a substitute for LM78L15ACM (8-SOIC package)?

A: L78L15ACZ is electrically equivalent but uses a through-hole TO-92-3 package instead of surface mount 8-SOIC. This substitution requires PCB redesign and is suitable only if your application supports through-hole mounting. For surface mount designs, select 8-SOIC packaged alternatives.

Q: What is the difference between MC78L15ABDR2G and MC78L15ACDR2G?

A: Both parts are functionally identical with 15V output and 100mA current rating. The primary difference is operating temperature range: MC78L15ABDR2G operates from -40°C to 125°C, while MC78L15ACDR2G operates from 0°C to 125°C. Select MC78L15ABDR2G for applications requiring extended low-temperature performance.

Q: Why does UA78L15ACDR show 30V maximum input versus 35V for other parts?

A: UA78L15ACDR has a lower maximum input voltage specification (30V) compared to the original LM78L15ACM (35V). This reduced rating may limit its use in applications with higher input voltage margins. Verify your circuit's maximum input voltage before selecting this part.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original LM78L15ACM specification.

Q: What does "Last Time Buy" status mean for the original LM78L15ACM?

A: Last Time Buy indicates Texas Instruments has announced end-of-life for this part number. Existing inventory is available but no future production is planned. Transition to active alternatives such as LM78L15ACM/NOPB or other listed substitutes for ongoing supply assurance.

Q: Can I substitute based on quiescent current differences?

A: Quiescent current variations (3mA to 6.5mA) are acceptable for most applications. However, in battery-powered or ultra-low-power designs where standby current is critical, verify that the higher quiescent current of substitute parts does not exceed your design budget before selection.

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