MIC39500-1.8BT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC39500-1.8BT is a linear voltage regulator IC from Microchip Technology designed to deliver a fixed 1.8V output at 5A in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The regulator 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 in through-hole mounting configurations.

Substiute Parts

MIC39500-1.8BT

Microchip TechnologyIn Stock: 1255MIC39500-1.8BT Datasheet

Current PartRFQ

MIC39500-1.8WT

Microchip TechnologyIn Stock: 934MIC39500-1.8WT Datasheet

DirectRFQ

TLV2217-18KCS

Texas InstrumentsIn Stock: 1932TLV2217-18KCS Datasheet

MFR RecommendedRFQ

TLV2217-18KCSE3

Texas InstrumentsIn Stock: 1501TLV2217-18KCSE3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MIC39500-1.8BT is determined by the following critical parameters:

• Output Voltage: Must be fixed at 1.8V
• Package / Case: Must be TO-220-3 for mechanical and thermal compatibility
• Mounting Type: Must be through-hole
• Output Configuration: Must be positive fixed output
• Protection Features: Must include over-current and over-temperature protection

The substitute parts are grouped into two categories:

Category 1 - Direct Microchip Equivalent: MIC39500-1.8WT maintains identical electrical specifications (5A output current, 16V max input, 0.575V dropout) and packaging, with the primary difference being active product status and RoHS3 compliance.

Category 2 - Texas Instruments Alternative: TLV2217-18KCS and TLV2217-18KCSE3 provide functional substitution with the same 1.8V fixed output and TO-220-3 package. These parts differ in output current capacity (500mA vs. 5A) and maximum input voltage (12V vs. 16V), requiring application-level verification of current and voltage requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): MIC39500-1.8WT is the primary substitute, offering identical electrical performance and packaging while maintaining active product status and RoHS3 compliance. This part is suitable for applications requiring the full 5A output current and 16V maximum input voltage of the original MIC39500-1.8BT.

For Current-Limited Applications: TLV2217-18KCS and TLV2217-18KCSE3 are suitable only for applications where output current requirements do not exceed 500mA and input voltage remains below 12V. These Texas Instruments alternatives provide active product status and RoHS3 compliance but represent a functional downgrade in current capacity and input voltage rating.

Compliance Considerations: The original MIC39500-1.8BT is RoHS non-compliant. All substitute parts (MIC39500-1.8WT, TLV2217-18KCS, TLV2217-18KCSE3) are RoHS3 compliant, meeting modern regulatory requirements for new designs and production.

Temperature Range: The MIC39500-1.8BT and MIC39500-1.8WT support -40°C to 125°C operation. The TLV2217 variants operate from 0°C to 125°C, which may be limiting for applications requiring extended low-temperature performance.

Frequently Asked Questions (FAQ)

Q: Can TLV2217-18KCS directly replace MIC39500-1.8BT in all applications?

A: No. While both parts provide 1.8V fixed output in TO-220-3 packages, the TLV2217-18KCS is rated for 500mA maximum output current compared to the MIC39500-1.8BT's 5A rating. Substitution is valid only for applications requiring 500mA or less. Additionally, the TLV2217-18KCS maximum input voltage is 12V versus 16V for the MIC39500-1.8BT.

Q: What is the difference between MIC39500-1.8WT and MIC39500-1.8BT?

A: Both parts are electrically and mechanically identical with identical specifications for output voltage, current, input voltage, and dropout characteristics. The primary differences are product status (MIC39500-1.8WT is active; MIC39500-1.8BT is obsolete), RoHS compliance (MIC39500-1.8WT is RoHS3 compliant; MIC39500-1.8BT is non-compliant), and packaging format (MIC39500-1.8WT is supplied in tubes).

Q: Are the TLV2217 variants suitable for high-current applications?

A: No. The TLV2217-18KCS and TLV2217-18KCSE3 are rated for 500mA output current, making them unsuitable for applications requiring 5A output. For high-current requirements, MIC39500-1.8WT is the appropriate substitute.

Q: What is the difference between TLV2217-18KCS and TLV2217-18KCSE3?

A: Both parts are electrically identical with the same 1.8V output, 500mA current rating, and TO-220-3 package. The primary difference is moisture sensitivity level (MSL): TLV2217-18KCS has MSL not applicable, while TLV2217-18KCSE3 has MSL 1 (Unlimited). Both are RoHS3 compliant and active products.

Q: Does the operating temperature range affect substitution decisions?

A: Yes, for applications operating below 0°C. The MIC39500-1.8BT and MIC39500-1.8WT support -40°C to 125°C, while TLV2217 variants operate from 0°C to 125°C. Applications requiring sub-zero operation must use MIC39500-1.8WT.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use TO-220-3 through-hole packages. MIC39500-1.8WT and TLV2217 variants are supplied in tubes. Packaging format does not affect electrical or mechanical compatibility.