MIC39151-1.8BT Equivalent & Substitute Parts

Part Overview

The MIC39151-1.8BT is a linear voltage regulator IC from Microchip Technology designed to deliver a fixed 1.8V output at 1.5A in a TO-220-5 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides positive fixed output configuration with integrated protection features including over-current, over-temperature, and reverse polarity protection, suitable for applications requiring stable 1.8V power delivery with moderate current demands.

Substiute Parts

MIC39151-1.8BT

Microchip TechnologyIn Stock: 1094MIC39151-1.8BT Datasheet

Current PartRFQ

MIC39151-1.8WT

Microchip TechnologyIn Stock: 836MIC39151-1.8WT Datasheet

Parametric EquivalentRFQ

LT1764AET-1.8#PBF

Analog Devices Inc.In Stock: 1031LT1764AET-1.8#PBF Datasheet

MFR RecommendedRFQ

LT1764ET-1.8#PBF

Analog Devices Inc.In Stock: 1267LT1764ET-1.8#PBF Datasheet

MFR RecommendedRFQ

LT1963AET-1.8#06PBF

Analog Devices Inc.In Stock: 1340LT1963AET-1.8#06PBF Datasheet

MFR RecommendedRFQ

LT1963AET-1.8#PBF

Analog Devices Inc.In Stock: 1010LT1963AET-1.8#PBF Datasheet

MFR RecommendedRFQ

MIC39151-1.8WT

Microchip TechnologyIn Stock: 836MIC39151-1.8WT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MIC39151-1.8BT is determined by the following critical parameters:

Primary Substitution Criteria:

• Fixed output voltage of 1.8V
• TO-220-5 package configuration
• Through-hole mounting type
• Operating temperature range of -40°C to 125°C
• Protection features: Over-current, over-temperature, and reverse polarity protection
• Enable control feature

Substitution Categories:

Category 1: Direct Parametric Equivalent MIC39151-1.8WT from Microchip Technology matches all electrical and mechanical parameters of the main part. This substitute maintains identical output current (1.5A), input voltage maximum (16V), voltage dropout (0.5V @ 1.5A), and package configuration. The primary distinction is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. non-compliant).

Category 2: Higher Current Capacity Alternatives LT1764AET-1.8#PBF and LT1764ET-1.8#PBF from Analog Devices Inc. provide enhanced output current capability (3A vs. 1.5A) while maintaining the 1.8V fixed output and TO-220-5 package. These parts support higher input voltage (20V vs. 16V) and feature improved voltage dropout performance (0.66V @ 3A). Both are Active status with ROHS3 compliance.

Category 3: Current-Matched Alternatives LT1963AET-1.8#PBF and LT1963AET-1.8#06PBF from Analog Devices Inc. deliver 1.5A output current matching the original part, with 1.8V fixed output in TO-220-5 package. These alternatives support higher input voltage (20V vs. 16V) and feature lower voltage dropout (0.55V @ 1.5A vs. 0.5V @ 1.5A). Both are Active status with ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Obsolete to Active Transition): MIC39151-1.8WT is the recommended substitute when maintaining identical electrical specifications is required. This part provides a direct parametric match with the main part while offering Active product status and ROHS3 compliance, eliminating the obsolescence and regulatory compliance issues associated with the MIC39151-1.8BT.

For Enhanced Performance Applications: LT1963AET-1.8#PBF or LT1963AET-1.8#06PBF are suitable when improved voltage dropout performance is beneficial. These Analog Devices parts deliver lower dropout voltage (0.55V @ 1.5A) compared to the original specification (0.5V @ 1.5A) while maintaining 1.5A output current and supporting higher input voltage (20V). Both variants are Active status with ROHS3 compliance.

For Higher Current Demand Applications: LT1764AET-1.8#PBF or LT1764ET-1.8#PBF provide doubled output current capacity (3A vs. 1.5A) in the same TO-220-5 package. These alternatives support higher input voltage (20V) and are suitable for applications requiring greater current delivery while maintaining 1.8V output. Both are Active status with ROHS3 compliance.

Compliance Considerations: All substitute parts listed are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete MIC39151-1.8BT. All substitute parts maintain REACH Unaffected status and EAR99 ECCN classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can MIC39151-1.8WT be used as a direct replacement for MIC39151-1.8BT? A: Yes. MIC39151-1.8WT is a direct parametric equivalent with identical electrical specifications (1.8V output, 1.5A current, 0.5V dropout @ 1.5A) and mechanical configuration (TO-220-5 package, through-hole mounting). The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between the LT1764 and LT1963 series alternatives? A: Both series deliver 1.8V fixed output in TO-220-5 packages with identical operating temperature ranges and protection features. The LT1764 series provides 3A output current with 0.66V dropout, while the LT1963 series provides 1.5A output current with 0.55V dropout. Selection depends on current requirements and acceptable voltage dropout for the application.

Q: Are all substitute parts compatible with the same PCB layout? A: Yes. All substitute parts use the TO-220-5 package with identical pin configuration and through-hole mounting, allowing direct PCB compatibility without layout modifications.

Q: What is the significance of the "#06PBF" suffix on LT1963AET-1.8#06PBF? A: The "#06PBF" designation indicates a specific manufacturing flow variant (Flow 6) of the LT1963AET-1.8 part. Electrical and mechanical specifications remain identical to LT1963AET-1.8#PBF; the suffix reflects manufacturing process tracking.

Q: Can I use a higher current-rated substitute (LT1764 series) in a circuit designed for 1.5A output? A: Yes. The LT1764 series (3A rated) is backward compatible with circuits designed for 1.5A output. The regulator will deliver only the current demanded by the load, making it suitable for applications with current requirements up to 1.5A. Higher current capacity provides design margin for future upgrades.

Q: Are there any input voltage limitations when substituting parts? A: The original MIC39151-1.8BT supports maximum input voltage of 16V. Substitute parts from Analog Devices (LT1764 and LT1963 series) support 20V maximum input voltage, providing greater input voltage margin. Microchip's MIC39151-1.8WT maintains the 16V maximum input specification.

Q: What inventory status should I consider for production planning? A: All substitute parts listed are in active production with confirmed inventory availability. MIC39151-1.8WT has 806 units in stock, LT1764AET-1.8#PBF has 993 units, LT1764ET-1.8#PBF has 1159 units, LT1963AET-1.8#PBF has 925 units, and LT1963AET-1.8#06PBF has 1297 units available.