LP2985AIM5X-3.3 Equivalent & Substitute Parts

Part Overview

The LP2985AIM5X-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 150mA in a SOT-23-5 surface mount package. This part is classified as Obsolete, making it necessary to identify active equivalent alternatives for new designs and production continuity. The device provides positive fixed output regulation with integrated over-current, over-temperature, and short-circuit protection, suitable for low-power applications requiring stable 3.3V supply rails.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP2985AIM5X-3.3 is determined by the following critical parameters:

Output voltage fixed at 3.3V
Output current capability of 150mA
Maximum input voltage of 16V
Dropout voltage specification of 0.58V @ 150mA
SOT-23-5 package configuration
Operating temperature range of -40°C to 125°C
Presence of Enable control feature
Protection against over-current, over-temperature, and short-circuit conditions

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs. Variations in product status, RoHS compliance, and packaging format (Cut Tape vs. Tape & Reel) do not affect electrical interchangeability.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
LP2985AIM5X-3.3	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Obsolete	Non-compliant
LP2985AIM5X-3.3/NOPB	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-33DBVR	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-33DBVRE4	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Discontinued at DiGi Electronics	ROHS3 Compliant
LP2985-33DBVT	Texas Instruments	3.3V	150mA	0.575V @ 150mA	125 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985A-33DBVR	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985A-33DBVT	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985AIM5-3.3	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985AIM5-3.3/NOPB	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5-3.3	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985IM5-3.3/NOPB	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and production continuity, LP2985AIM5X-3.3/NOPB is the primary recommended substitute. This part maintains identical electrical specifications while offering Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

LP2985AIM5-3.3/NOPB and LP2985IM5-3.3/NOPB provide equivalent electrical performance with Active status and full RoHS compliance. These variants differ only in package format designation and are suitable for applications where packaging flexibility is required.

LP2985A-33DBVR and LP2985A-33DBVT are Active alternatives with ROHS3 compliance, offering identical electrical characteristics. Selection between these variants depends on packaging requirements (Cut Tape & Digi-Reel vs. alternative formats).

LP2985-33DBVR and LP2985-33DBVT maintain full electrical equivalence with Active status and RoHS compliance. LP2985-33DBVT exhibits marginally higher quiescent current (125 µA vs. 95 µA) and dropout voltage (0.575V vs. 0.58V), which may be relevant in power-sensitive applications.

Parts designated as Last Time Buy (LP2985AIM5-3.3, LP2985IM5-3.3) remain electrically equivalent but have limited availability windows. LP2985-33DBVRE4 is discontinued at DiGi Electronics and should not be selected for new production.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5X-3.3 be directly replaced with LP2985AIM5X-3.3/NOPB?

A: Yes. Both parts deliver identical electrical performance: 3.3V fixed output, 150mA current capability, 0.58V dropout voltage, and SOT-23-5 packaging. The /NOPB suffix indicates lead-free, RoHS-compliant manufacturing. LP2985AIM5X-3.3/NOPB is Active and recommended for new designs.

Q: What is the difference between LP2985AIM5-3.3 and LP2985IM5-3.3?

A: Both variants are electrically identical with 3.3V output, 150mA current, and SOT-23-5 packaging. The difference lies in internal die or manufacturing process designation. Both are available with /NOPB suffix in Active status. Selection depends on inventory availability and supplier preference.

Q: Are LP2985-33DBVT and LP2985A-33DBVT interchangeable?

A: Yes, with minor parameter variance. LP2985-33DBVT exhibits quiescent current of 125 µA and dropout voltage of 0.575V, while LP2985A-33DBVT specifies 95 µA and 0.58V respectively. Both deliver 3.3V at 150mA in SOT-23-5 packaging. Selection should account for power budget requirements in low-current standby conditions.

Q: Why is RoHS compliance important for this regulator?

A: RoHS3 compliance ensures the part meets current environmental and regulatory standards for lead-free manufacturing. All Active substitute parts listed are ROHS3 compliant, supporting compliance requirements in end-product certifications and supply chain regulations.

Q: Can I use parts marked as Last Time Buy?

A: Parts designated Last Time Buy (LP2985AIM5-3.3, LP2985IM5-3.3) remain electrically equivalent but have finite inventory. These should be used only if immediate availability is critical. For long-term production, select Active status parts such as LP2985AIM5X-3.3/NOPB or LP2985IM5-3.3/NOPB.

Q: Does package format affect electrical performance?

A: No. Cut Tape (CT) & Digi-Reel and Tape & Reel (TR) packaging formats contain identical die and deliver identical electrical specifications. Format selection depends on assembly equipment compatibility and procurement logistics, not circuit performance.

Q: What protection features are included in all substitute parts?

A: All listed substitutes include over-current, over-temperature, and short-circuit protection. Enable control feature is present across all variants, allowing external shutdown capability in circuit designs.

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