LP3985IM5-2.6/NOPB Equivalent & Substitute Parts

Part Overview

The LP3985IM5-2.6/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 2.6V output at 150mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device provides positive fixed output regulation with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for low-power applications requiring stable 2.6V rails.

Substiute Parts

LP3985IM5-2.6/NOPB

Texas InstrumentsIn Stock: 3392LP3985IM5-2.6/NOPB Datasheet

Current PartRFQ

MIC5255-2.6YD5-TR

Microchip TechnologyIn Stock: 989MIC5255-2.6YD5-TR Datasheet

MFR RecommendedRFQ

MIC5255-2.6YM5-TR

Microchip TechnologyIn Stock: 1097MIC5255-2.6YM5-TR Datasheet

MFR RecommendedRFQ

RT9169H-26GB

Richtek USA Inc.In Stock: 970RT9169H-26GB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP3985IM5-2.6/NOPB is determined by the following critical parameters:

• Fixed output voltage of 2.6V
• Minimum output current capability of 150mA
• Maximum input voltage of 6V
• SOT-23-5 package compatibility
• Surface mount technology
• Operating temperature range of -40°C to 125°C
• Positive fixed output configuration
• Enable control feature
• RoHS3 compliance

The substitute parts identified meet these core electrical and mechanical requirements. Variations in dropout voltage, quiescent current, PSRR, and specific protection feature implementations are secondary parameters that do not prevent functional substitution when the primary criteria are satisfied.

Parameter Comparison

Engineering Selection Recommendations

MIC5255-2.6YD5-TR (Microchip Technology) and MIC5255-2.6YM5-TR (Microchip Technology) are primary substitutes. Both devices are active products with ROHS3 compliance and maintain the 150mA output current specification. The MIC5255 series offers improved PSRR performance (60dB ~ 50dB at 10Hz ~ 10kHz) compared to the original part and includes Under Voltage Lockout (UVLO) protection in addition to over-current and over-temperature protection. The MIC5255-2.6YD5-TR uses TSOT-23-5 packaging, while the MIC5255-2.6YM5-TR uses standard SOT-23-5 packaging. Both support the full -40°C to 125°C operating temperature range.

RT9169H-26GB (Richtek USA Inc.) is a secondary substitute suitable for applications where output current requirements do not exceed 100mA. This device features significantly lower quiescent current (7 µA versus 150 µA), making it advantageous for battery-powered or low-power standby applications. However, the RT9169H-26GB has a higher dropout voltage (0.6V @ 100mA) and a reduced upper operating temperature limit of 85°C, which may not be suitable for all thermal environments. ROHS3 compliance is maintained.

Selection should prioritize the MIC5255 series for direct replacement in applications requiring the full 150mA output current and extended temperature range. The RT9169H-26GB should be evaluated only when current requirements are confirmed below 100mA and thermal constraints permit operation to 85°C maximum.

Frequently Asked Questions (FAQ)

Q: Can the MIC5255-2.6YD5-TR (TSOT-23-5) be used as a direct PCB replacement for the LP3985IM5-2.6/NOPB (SOT-23-5)?

A: The MIC5255-2.6YD5-TR uses TSOT-23-5 packaging, which has different pin spacing and dimensions compared to standard SOT-23-5. While both are five-pin packages, TSOT-23-5 is a thinner variant. PCB footprint compatibility must be verified before substitution. The MIC5255-2.6YM5-TR uses standard SOT-23-5 packaging and is the preferred choice for direct footprint compatibility.

Q: What is the difference between MIC5255-2.6YD5-TR and MIC5255-2.6YM5-TR?

A: Both devices are electrically identical with the same output voltage (2.6V), output current (150mA), and performance specifications. The primary difference is packaging: MIC5255-2.6YD5-TR uses TSOT-23-5 (thin SOT-23-5), while MIC5255-2.6YM5-TR uses standard SOT-23-5. Selection depends on PCB footprint requirements and available board space.

Q: Is the RT9169H-26GB suitable for all applications using the LP3985IM5-2.6/NOPB?

A: The RT9169H-26GB is suitable only for applications where output current does not exceed 100mA and operating temperature remains below 85°C. The original LP3985IM5-2.6/NOPB supports 150mA output and -40°C to 125°C operation. Applications requiring the full 150mA output current or extended high-temperature operation must use the MIC5255 series.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The LP3985IM5-2.6/NOPB, MIC5255-2.6YD5-TR, MIC5255-2.6YM5-TR, and RT9169H-26GB are all ROHS3 compliant.

Q: What protection features does each substitute provide?

A: The LP3985IM5-2.6/NOPB provides over-current, over-temperature, and short-circuit protection. The MIC5255 series provides over-current, over-temperature, and under-voltage lockout (UVLO) protection. The RT9169H-26GB provides over-current protection. UVLO in the MIC5255 series offers additional protection against low input voltage conditions.

Q: Can the LP3985IM5-2.6/NOPB be used interchangeably with these substitutes in existing designs?

A: The MIC5255-2.6YM5-TR offers direct electrical and mechanical compatibility for designs using standard SOT-23-5 footprints. The MIC5255-2.6YD5-TR requires footprint verification due to TSOT-23-5 packaging. The RT9169H-26GB requires design review to confirm current and temperature requirements are within its specifications. All three are electrically compatible at the 2.6V fixed output level.