MIC37139-2.5BS TR Equivalent & Substitute Parts

Part Overview

The MIC37139-2.5BS TR is a linear voltage regulator IC from Microchip Technology designed to deliver a fixed 2.5V output at 1.5A in a SOT-223-3 surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The part provides over current, over temperature, and reverse polarity protection across an operating temperature range of -40°C to 125°C.

Substiute Parts

MIC37139-2.5BS TR

Microchip TechnologyIn Stock: 1753MIC37139-2.5BS TR Datasheet

Current PartRFQ

LM1117MP-2.5/NOPB

Texas InstrumentsIn Stock: 3131LM1117MP-2.5/NOPB Datasheet

MFR RecommendedRFQ

LM1117MPX-2.5/NOPB

Texas InstrumentsIn Stock: 5282LM1117MPX-2.5/NOPB Datasheet

MFR RecommendedRFQ

TLV1117LV25DCYR

Texas InstrumentsIn Stock: 65130TLV1117LV25DCYR Datasheet

MFR RecommendedRFQ

TLV1117LV25DCYT

Texas InstrumentsIn Stock: 10297TLV1117LV25DCYT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC37139-2.5BS TR are selected based on the following critical parameters:

• Fixed output voltage of 2.5V
• Surface mount SOT-223 package family compatibility
• Output current capability of 1.5A or greater
• Maximum input voltage rating of 5.5V or higher
• Operating temperature range spanning -40°C to 125°C
• Integrated protection features (over current and over temperature)

The substitute parts are grouped into two categories based on output current capacity and input voltage specifications. Parts with 800mA output current are suitable for applications where the full 1.5A is not required. Parts with 1A output current provide closer performance alignment to the original specification.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring full 1.5A output current with extended temperature range:

TLV1117LV25DCYR and TLV1117LV25DCYT are the primary substitutes. Both devices deliver 1A output current and maintain the -40°C to 125°C operating temperature range of the original part. These parts are ROHS3 compliant with MSL 1 rating, providing superior moisture handling compared to the obsolete MIC37139-2.5BS TR. The TLV1117LV25DCYT variant is packaged in Tape & Reel format, matching the original packaging type.

For applications with reduced current requirements (800mA or less):

LM1117MP-2.5/NOPB and LM1117MPX-2.5/NOPB are suitable alternatives. These parts accept higher input voltages (15V maximum) and are ROHS3 compliant. However, the operating temperature range is limited to 0°C to 125°C, which excludes low-temperature operation below 0°C. These parts are appropriate only when the application does not require the full -40°C lower temperature limit.

Compliance and availability:

All substitute parts are active products with ROHS3 compliance and REACH unaffected status. The TLV1117 series offers superior inventory availability and lower moisture sensitivity levels, supporting long-term production continuity.

Frequently Asked Questions (FAQ)

Q: Can LM1117MP-2.5/NOPB directly replace MIC37139-2.5BS TR?

A: Direct replacement is not recommended for applications requiring the full 1.5A output current or operating temperatures below 0°C. The LM1117MP-2.5/NOPB is rated for 800mA maximum output and has a 0°C to 125°C operating range. Use only if your application requires 800mA or less and does not operate below 0°C.

Q: What is the difference between TLV1117LV25DCYR and TLV1117LV25DCYT?

A: Both parts are electrically identical with 1A output current and -40°C to 125°C operating temperature. The primary difference is packaging: DCYR is supplied in Cut Tape format, while DCYT is supplied in Tape & Reel format. Select based on your procurement and assembly requirements.

Q: Why does the MIC37139-2.5BS TR have reverse polarity protection while some substitutes do not list this feature?

A: Reverse polarity protection is a specific design feature of the MIC37139. The substitute parts provide over current and over temperature protection. If reverse polarity protection is critical to your application, verify circuit design includes external protection or select a substitute that explicitly lists this feature.

Q: Are the SOT-223-3 and SOT-223-4 packages pin-compatible?

A: No. SOT-223-3 has three pins while SOT-223-4 has four pins. PCB layout modifications are required when substituting between these package variants. Verify pinout compatibility with your circuit design before implementation.

Q: What is the significance of the 0.5V dropout voltage in the original part?

A: The MIC37139-2.5BS TR has a lower dropout voltage (0.5V @ 1.5A) compared to substitutes (1.2V to 1.3V). This means the original part requires less headroom between input and output voltages. In applications with tight input voltage margins, verify that substitute parts with higher dropout voltages remain within your system's input voltage specifications.

Q: Can I use TLV1117LV25DCYR in applications operating below 0°C?

A: Yes. The TLV1117LV25DCYR is rated for -40°C to 125°C operation, matching the original part's temperature range. The LM1117 series (LM1117MP-2.5/NOPB and LM1117MPX-2.5/NOPB) are limited to 0°C to 125°C and are not suitable for sub-zero applications.