LP2985IM5X-3.3 Equivalent & Substitute Parts

Part Overview

The LP2985IM5X-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 3.3V output at 150mA with a maximum input voltage of 16V and operates across the temperature range of -40°C to 125°C. The part is mounted in a SOT-23-5 surface mount package.

The LP2985IM5X-3.3 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this regulator.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP2985IM5X-3.3
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LP2985IM5X-3.3 are identified based on strict parametric equivalence across the following critical criteria:

Electrical Parameters (Must Match):

Output voltage: 3.3V fixed
Output current: 150mA
Input voltage maximum: 16V
Dropout voltage: 0.58V @ 150mA (tolerance: ±0.005V acceptable)
Quiescent current: 95 µA (tolerance: ±30 µA acceptable)
PSRR: 45dB (1kHz)
Control features: Enable function
Protection features: Over Current, Over Temperature, Short Circuit

Mechanical Parameters (Must Match):

Package / Case: SC-74A, SOT-753
Supplier Device Package: SOT-23-5
Mounting Type: Surface Mount

Compliance & Status Considerations:

RoHS compliance status varies among substitutes
Product status ranges from Active to Discontinued at DiGi Electronics
All substitutes maintain REACH Unaffected or REACH Affected status

All identified substitute parts meet the electrical and mechanical requirements for direct replacement in the LP2985IM5X-3.3 application.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 150mA	Quiescent Current	Package	Product Status	RoHS Status
LP2985IM5X-3.3	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Obsolete	RoHS non-compliant
LP2985-33DBVR	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-33DBVRE4	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Discontinued at DiGi Electronics	ROHS3 Compliant
LP2985-33DBVT	Texas Instruments	3.3V	150mA	16V	0.575V	125 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985A-33DBVR	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985A-33DBVT	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985AIM5-3.3	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985AIM5-3.3/NOPB	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985AIM5X-3.3/NOPB	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5-3.3	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985IM5-3.3/NOPB	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LP2985AIM5X-3.3/NOPB

This part offers the highest availability (53,200 units in stock), Active product status, and ROHS3 compliance. It provides direct electrical and mechanical equivalence to the obsolete LP2985IM5X-3.3 with modern regulatory compliance.

Secondary Recommendations:

LP2985AIM5-3.3/NOPB and LP2985IM5-3.3/NOPB are both Active status parts with substantial inventory (25,100 and 16,043 units respectively) and ROHS3 compliance. These represent viable alternatives with equivalent electrical performance.

LP2985A-33DBVR and LP2985A-33DBVT are Active status parts with strong inventory levels (56,200 and 12,138 units respectively) and ROHS3 compliance. These offer parametric equivalence with different packaging configurations.

Consideration for Legacy Applications:

If RoHS non-compliance is a design requirement, no substitute parts meet this criterion, as all identified alternatives are ROHS3 compliant. The original LP2985IM5X-3.3 remains the only option for non-compliant applications.

Inventory & Supply Chain:

Parts with Active status and higher inventory levels (LP2985AIM5X-3.3/NOPB, LP2985A-33DBVR, LP2985AIM5-3.3/NOPB) are preferred for new designs and ongoing production to ensure long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can LP2985-33DBVT be used as a direct replacement for LP2985IM5X-3.3?

A: LP2985-33DBVT is electrically and mechanically compatible with the following exceptions: quiescent current is specified at 125 µA (versus 95 µA for the original), and dropout voltage is 0.575V (versus 0.58V). These variations fall within acceptable tolerance ranges for most applications. The part is Active status with ROHS3 compliance.

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

A: Both parts are electrically identical with matching electrical specifications. The /NOPB suffix indicates lead-free (no lead) and halogen-free construction. LP2985IM5-3.3/NOPB is Active status with higher availability (16,043 units), while LP2985IM5-3.3 is Last Time Buy status (26,300 units). For new designs, LP2985IM5-3.3/NOPB is recommended.

Q: Are all substitute parts in the same SOT-23-5 package?

A: Yes. All identified substitute parts use the SC-74A, SOT-753 package designation with SOT-23-5 supplier device package specification. They are mechanically interchangeable in the same PCB footprint.

Q: Which substitute part has the best long-term availability?

A: LP2985AIM5X-3.3/NOPB has the highest current inventory (53,200 units) and Active product status, indicating ongoing production and supply continuity. This part is recommended for designs requiring extended production runs.

Q: Do all substitute parts meet RoHS compliance?

A: All identified substitute parts are ROHS3 compliant. The original LP2985IM5X-3.3 is RoHS non-compliant. If RoHS compliance is required, all listed substitutes meet this requirement. If RoHS non-compliance is a design constraint, no substitutes are available.

Q: What is the significance of "Last Time Buy" status?

A: Parts designated as Last Time Buy (LP2985AIM5-3.3 and LP2985IM5-3.3) indicate that production is ending and inventory will not be replenished. These parts should be used only for legacy applications or short-term production runs. Active status parts are preferred for ongoing designs.

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