SC1541CS-3.3TRT Equivalent & Substitute Parts

Part Overview

The SC1541CS-3.3TRT is a linear voltage regulator IC manufactured by Semtech Corporation, designed to deliver a fixed 3.3V output at 1A maximum current. This device is classified as a positive fixed output regulator with integrated over-current and over-temperature protection features, housed in an 8-SOIC surface mount package.

The SC1541CS-3.3TRT has reached obsolete product status. Identifying functionally equivalent substitute components is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications currently utilizing this regulator.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	1A
Input Voltage (Max)	7V
Voltage Dropout (Max)	1.3V @ 1A
Package Type	8-SOIC (0.154", 3.90mm Width)
Output Configuration	Positive Fixed
Protection Features	Over Current, Over Temperature
Control Features	Enable
Operating Temperature Range	0°C ~ 125°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute components for the SC1541CS-3.3TRT must satisfy the following criteria:

Fixed 3.3V output voltage
Minimum 1A output current capability
8-SOIC package footprint compatibility (0.154", 3.90mm Width)
Positive output configuration
Integrated over-current and over-temperature protection
Enable control feature
Surface mount technology

The AP2115M-3.3TRG1 meets these substitution requirements. Both devices share identical output voltage, current rating, package form factor, and core protection architecture. Variations in input voltage rating, dropout voltage, quiescent current, and operating temperature range are secondary parameters that do not prevent functional substitution in applications designed for the SC1541CS-3.3TRT.

Parameter Comparison

Parameter	SC1541CS-3.3TRT	AP2115M-3.3TRG1
Manufacturer	Semtech Corporation	Diodes Incorporated
Output Voltage (Fixed)	3.3V	3.3V
Output Current	1A	1A
Input Voltage (Max)	7V	6V
Voltage Dropout (Max)	1.3V @ 1A	0.75V @ 1A
Current - Quiescent (Iq)	10 µA	90 µA
PSRR	72dB (120Hz)	65dB (100Hz ~ 1kHz)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Operating Temperature	0°C ~ 125°C	-40°C ~ 85°C
Product Status	Obsolete	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AP2115M-3.3TRG1 is the primary substitute for the SC1541CS-3.3TRT based on the following factors:

Product Status: The AP2115M-3.3TRG1 maintains active product status with confirmed inventory availability (12,300 pcs), whereas the SC1541CS-3.3TRT is obsolete. This ensures long-term supply chain viability and continued manufacturer support.

Compliance & Certifications: Both devices are RoHS compliant. The AP2115M-3.3TRG1 carries ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements for electronic components in regulated markets.

Functional Equivalence: Both regulators deliver identical 3.3V fixed output at 1A maximum current in the same 8-SOIC package footprint. Core protection features (over-current, over-temperature) and control architecture (Enable pin) are functionally equivalent.

Performance Considerations: The AP2115M-3.3TRG1 exhibits superior dropout voltage performance (0.75V vs. 1.3V @ 1A), which may provide operational advantages in power-constrained applications. The SC1541CS-3.3TRT operates across a wider input voltage range (7V vs. 6V maximum) and wider temperature range (0°C ~ 125°C vs. -40°C ~ 85°C). Applications requiring these specific performance characteristics must evaluate compatibility accordingly.

Frequently Asked Questions (FAQ)

Q: Can the AP2115M-3.3TRG1 directly replace the SC1541CS-3.3TRT on existing PCBs?

A: Yes. Both devices use identical 8-SOIC package geometry (0.154", 3.90mm Width) and pin configuration. Direct PCB footprint compatibility is confirmed. No layout modifications are required.

Q: What is the primary reason for substitution?

A: The SC1541CS-3.3TRT is obsolete. The AP2115M-3.3TRG1 is an active product with confirmed manufacturer support and inventory availability, ensuring supply chain continuity.

Q: Are there differences in operating temperature ranges between these devices?

A: Yes. The SC1541CS-3.3TRT operates from 0°C ~ 125°C, while the AP2115M-3.3TRG1 operates from -40°C ~ 85°C. Applications requiring operation above 85°C must verify compatibility with the AP2115M-3.3TRG1 specifications.

Q: How do the input voltage ratings differ?

A: The SC1541CS-3.3TRT accepts input voltages up to 7V maximum, while the AP2115M-3.3TRG1 is rated to 6V maximum. Applications with input voltages between 6V and 7V must confirm compatibility with the lower rating of the substitute device.

Q: What is the significance of the lower dropout voltage in the AP2115M-3.3TRG1?

A: The AP2115M-3.3TRG1 exhibits 0.75V dropout versus 1.3V for the SC1541CS-3.3TRT at 1A output current. Lower dropout voltage reduces power dissipation and heat generation, potentially improving efficiency in applications with limited input voltage headroom.

Q: Are both devices RoHS compliant?

A: Yes. The SC1541CS-3.3TRT is RoHS Compliant. The AP2115M-3.3TRG1 is ROHS3 Compliant, meeting current regulatory standards. Both devices satisfy RoHS requirements for regulated markets.

Q: What packaging format is the AP2115M-3.3TRG1 supplied in?

A: The AP2115M-3.3TRG1 is supplied in Tape & Reel (TR) format, standard for high-volume production environments. The SC1541CS-3.3TRT packaging format is not specified in available documentation.

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