LP3985IM5-3.2 Equivalent & Substitute Parts

Part Overview

The LP3985IM5-3.2 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.2V output at 150mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement continuity. The regulator features integrated protection against overcurrent, overtemperature, and short circuit conditions, with an enable control feature for power management applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.2V
Output Current	150mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.1V @ 150mA
Quiescent Current	150 µA
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-23-5 (SC-74A)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP3985IM5-3.2 is determined by strict equivalence across the following critical parameters:

Output voltage: 3.2V fixed
Output current capability: 150mA minimum
Input voltage rating: 6V maximum
Package type: SOT-23-5 surface mount
Operating temperature range: -40°C to 125°C
Control and protection feature set: Enable control with overcurrent, overtemperature, and short circuit protection

Two substitute parts meet these criteria: LP3985IM5-3.2/NOPB (Texas Instruments, active status) and MIC5255-3.2YM5-TR (Microchip Technology, active status). Both maintain identical output specifications and package compatibility while offering improved product lifecycle status compared to the obsolete main part.

Parameter Comparison

Parameter	LP3985IM5-3.2 (Main)	LP3985IM5-3.2/NOPB	MIC5255-3.2YM5-TR
Manufacturer	Texas Instruments	Texas Instruments	Microchip Technology
Product Status	Obsolete	Active	Active
Output Voltage	3.2V	3.2V	3.2V
Output Current	150mA	150mA	150mA
Input Voltage (Max)	6V	6V	6V
Voltage Dropout (Max)	0.1V @ 150mA	0.1V @ 150mA	0.25V @ 150mA
Quiescent Current	150 µA	150 µA	150 µA
PSRR	50dB ~ 40dB (1kHz ~ 10kHz)	50dB ~ 40dB (1kHz ~ 10kHz)	60dB ~ 50dB (10Hz ~ 10kHz)
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package	SOT-23-5	SOT-23-5	SOT-23-5
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Under Voltage Lockout (UVLO)
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

LP3985IM5-3.2/NOPB is the direct parametric equivalent from Texas Instruments with active product status and ROHS3 compliance. This part maintains identical electrical specifications including voltage dropout performance and PSRR characteristics, making it the primary substitute for obsolete inventory replacement.

MIC5255-3.2YM5-TR from Microchip Technology provides functional equivalence with active product status and ROHS3 compliance. The primary design consideration is the increased voltage dropout specification of 0.25V at 150mA compared to 0.1V for the Texas Instruments variants. Additionally, the MIC5255 includes Under Voltage Lockout (UVLO) protection in place of the short circuit protection present in the LP3985 series. The MIC5255 offers superior PSRR performance across a wider frequency range (10Hz to 10kHz versus 1kHz to 10kHz).

Both substitutes are available in active production status with current inventory, supporting long-term design continuity beyond the obsolete LP3985IM5-3.2.

Frequently Asked Questions (FAQ)

Q: Can LP3985IM5-3.2/NOPB directly replace LP3985IM5-3.2 in existing designs?

A: Yes. Both parts share identical electrical specifications, output voltage, current rating, operating temperature range, and SOT-23-5 package. The primary difference is product status: LP3985IM5-3.2/NOPB is active while the original is obsolete. The /NOPB designation indicates lead-free packaging compliance.

Q: What are the key differences between LP3985IM5-3.2/NOPB and MIC5255-3.2YM5-TR?

A: Both deliver 3.2V at 150mA in SOT-23-5 packages with identical quiescent current and operating temperature ranges. The MIC5255 has higher voltage dropout (0.25V versus 0.1V at 150mA), superior PSRR performance, and includes UVLO protection instead of short circuit protection. Applications requiring minimal dropout voltage should prioritize the LP3985IM5-3.2/NOPB.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the SOT-23-5 package with identical pinout, enabling direct PCB-level substitution without layout modifications.

Q: Which substitute is recommended for new designs?

A: Selection depends on specific application requirements. For designs prioritizing low dropout voltage and short circuit protection, use LP3985IM5-3.2/NOPB. For applications benefiting from enhanced noise rejection and UVLO functionality, use MIC5255-3.2YM5-TR. Both are active products with current manufacturing support.

Q: Do all parts meet RoHS compliance requirements?

A: LP3985IM5-3.2 is RoHS non-compliant. Both LP3985IM5-3.2/NOPB and MIC5255-3.2YM5-TR are ROHS3 compliant, meeting current environmental standards for new designs and procurement.

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