MCP1603T-150I/OS Equivalent & Substitute Parts

Part Overview

The MCP1603T-150I/OS is a buck switching regulator IC from Microchip Technology, delivering a fixed 1.5V output at 500mA. This surface-mount PMIC operates across a 2.7V to 5.5V input range with a 2MHz switching frequency and integrated synchronous rectification. The device is actively produced, RoHS3 compliant, and suitable for cost-sensitive applications requiring compact power conversion in portable and embedded systems.

Substitute parts are identified when design requirements change, inventory constraints occur, or alternative sourcing becomes necessary while maintaining functional equivalence within specified electrical and mechanical parameters.

Substiute Parts

MCP1603T-150I/OS

Microchip TechnologyIn Stock: 1136MCP1603T-150I/OS Datasheet

Current PartRFQ

ADP2108AUJZ-1.3-R7

Analog Devices Inc.In Stock: 6278ADP2108AUJZ-1.3-R7 Datasheet

MFR RecommendedRFQ

ADP2108AUJZ-1.5-R7

Analog Devices Inc.In Stock: 3539ADP2108AUJZ-1.5-R7 Datasheet

MFR RecommendedRFQ

LM3670MF-1.5/NOPB

Texas InstrumentsIn Stock: 3824LM3670MF-1.5/NOPB Datasheet

MFR RecommendedRFQ

LM3671MF-1.5/NOPB

Texas InstrumentsIn Stock: 2164LM3671MF-1.5/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Output Voltage: Must match 1.5V fixed output
• Package / Case: Must be SOT-23-5 Thin (TSOT-23-5) for PCB compatibility
• Topology: Must be buck (step-down) configuration
• Output Configuration: Must be positive fixed output
• Synchronous Rectifier: Must be present
• Input Voltage Range: Must encompass or exceed 2.7V – 5.5V
• Output Current: Must meet or exceed 500mA requirement
• Mounting Type: Must be surface mount
• RoHS Status: Must be ROHS3 compliant

Substitute parts are grouped by output voltage matching (1.5V primary group) and current capability. Parts with identical output voltage and package type are direct substitutes. Parts with different output voltages (1.3V) are listed but require circuit design verification for voltage-dependent applications.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (1.5V Output, SOT-23-5 Package)

ADP2108AUJZ-1.5-R7 and LM3671MF-1.5/NOPB are direct functional equivalents with matching 1.5V output voltage and SOT-23-5 package footprint. Both devices exceed the 500mA current requirement (600mA capability) and maintain full input voltage range compatibility. All parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Current-Limited Substitute (1.5V Output, SOT-23-5 Package)

LM3670MF-1.5/NOPB provides 1.5V output in SOT-23-5 package but delivers only 350mA maximum output current. This part is suitable only for applications where load current does not exceed 350mA. Operating temperature range is limited to -40°C to 85°C compared to the MCP1603T-150I/OS specification of -40°C to 125°C.

Alternative Voltage Option (1.3V Output, SOT-23-5 Package)

ADP2108AUJZ-1.3-R7 provides 1.3V fixed output with 600mA capability in SOT-23-5 package. This part is applicable only to designs where 1.3V output voltage is functionally acceptable. Lower input voltage minimum (2.3V vs. 2.7V) provides extended low-voltage operation capability.

Package Consideration

LM3670MF-1.5/NOPB and LM3671MF-1.5/NOPB use SC-74A (SOT-753) package designation, which differs from the TSOT-23-5 package of the main part. Verify PCB footprint compatibility before selection.

Frequently Asked Questions (FAQ)

Q: Can ADP2108AUJZ-1.5-R7 directly replace MCP1603T-150I/OS?

A: Yes. Both devices provide 1.5V fixed output, support 500mA+ load current, operate across 2.7V–5.5V input range, use SOT-23-5 package, include synchronous rectification, and are ROHS3 compliant. Pin-to-pin compatibility and functional equivalence are confirmed within specified parameters.

Q: Why is LM3670MF-1.5/NOPB listed as a substitute if it only provides 350mA?

A: LM3670MF-1.5/NOPB meets substitution criteria for applications requiring less than 350mA output current. It is not suitable for designs requiring the full 500mA capability of the MCP1603T-150I/OS.

Q: Can I use ADP2108AUJZ-1.3-R7 in place of MCP1603T-150I/OS?

A: Only if your circuit design accepts 1.3V output voltage instead of 1.5V. The lower output voltage may affect downstream component operation and power delivery. Verify voltage-dependent circuit requirements before substitution.

Q: What is the difference between SOT-23-5 Thin (TSOT-23-5) and SC-74A (SOT-753)?

A: These are different package designations with different physical dimensions and PCB footprints. Verify your PCB layout supports the selected package before component procurement. TSOT-23-5 is thinner than standard SOT-23-5.

Q: Are all substitute parts actively produced?

A: Yes. All listed substitute parts maintain active product status with current manufacturing and distribution availability.

Q: Do all substitute parts meet the -40°C to 125°C operating temperature range?

A: No. LM3670MF-1.5/NOPB and LM3671MF-1.5/NOPB are rated to -40°C to 85°C maximum. Applications requiring operation above 85°C must use MCP1603T-150I/OS, ADP2108AUJZ-1.5-R7, or ADP2108AUJZ-1.3-R7.