LP2985IM5-3.3 Equivalent & Substitute Parts

Part Overview

The LP2985IM5-3.3 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 industrial temperature range of -40°C to 125°C. The part is currently in Last Time Buy status, indicating limited availability and the necessity to identify equivalent alternatives for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Package Type	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP2985IM5-3.3 are classified based on strict electrical and mechanical parameter equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Output voltage: 3.3V fixed
Output current capability: 150mA
Maximum input voltage: 16V
Package type: SOT-23-5
Voltage dropout: 0.58V @ 150mA (with tolerance of ±0.005V)
Quiescent current: 95 µA (with tolerance of ±30 µA)
Operating temperature range: -40°C to 125°C
Protection features: Over Current, Over Temperature, Short Circuit

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents: Parts with identical part numbers except for packaging or lead finish designations (NOPB suffix indicates lead-free, no plumbum).

Parametric Equivalents: Parts from the same manufacturer with identical electrical specifications but different device variants (LP2985 vs. LP2985A series) or packaging configurations (Cut Tape vs. Tape & Reel).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ 150mA	Quiescent Current	Package	Status	Inventory
LP2985IM5-3.3	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Last Time Buy	26300 Pcs
LP2985IM5-3.3/NOPB	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	16043 Pcs
LP2985-33DBVR	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	55200 Pcs
LP2985-33DBVRE4	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Discontinued at DiGi Electronics	2290 Pcs
LP2985-33DBVT	Texas Instruments	3.3V	150mA	16V	0.575V	125 µA	SOT-23-5	Active	3330 Pcs
LP2985A-33DBVR	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	56200 Pcs
LP2985A-33DBVT	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	12138 Pcs
LP2985AIM5-3.3	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Last Time Buy	18100 Pcs
LP2985AIM5-3.3/NOPB	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	25100 Pcs
LP2985AIM5X-3.3/NOPB	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	53200 Pcs
LP2985IM5X-3.3/NOPB	Texas Instruments	3.3V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	33716 Pcs

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LP2985IM5-3.3/NOPB is the direct equivalent with Active product status and ROHS3 compliance. This part maintains identical electrical specifications and packaging while offering superior long-term availability compared to the Last Time Buy status of the original part.

LP2985A-33DBVR and LP2985A-33DBVT are parametric equivalents from the LP2985A series with Active status. These parts deliver identical electrical performance and are suitable for direct substitution in new designs and production runs.

LP2985AIM5-3.3/NOPB and LP2985AIM5X-3.3/NOPB represent the LP2985A variant in SOT-23-5 packaging with Active status and lead-free construction. These parts are recommended for applications requiring RoHS compliance and long-term supply assurance.

Secondary Substitutes (Conditional Use):

LP2985-33DBVR offers the highest inventory availability (55200 Pcs) with Active status and identical electrical specifications. This part is suitable for high-volume production requirements.

LP2985-33DBVT is electrically compatible with minor parameter variations (quiescent current 125 µA vs. 95 µA, dropout 0.575V vs. 0.58V). This part is acceptable for applications where these marginal differences do not impact system performance.

LP2985-33DBVRE4 is discontinued at DiGi Electronics and should be avoided for new designs despite parametric equivalence.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 rating. Parts with /NOPB designation are lead-free and suitable for applications requiring halogen-free construction. The LP2985AIM5-3.3 variant shows REACH Affected status, while all other substitutes show REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can LP2985IM5-3.3/NOPB be used as a direct replacement for LP2985IM5-3.3?

A: Yes. The /NOPB suffix indicates lead-free construction (no plumbum) and represents the current manufacturing standard. Electrical specifications, package type, and performance characteristics are identical. This is the recommended substitute for new designs.

Q: What is the difference between LP2985 and LP2985A variants?

A: Both variants deliver identical electrical specifications for the 3.3V output configuration. The LP2985A represents a later product generation. Both are suitable for direct substitution based on parametric equivalence.

Q: Are the LP2985IM5X and LP2985AIM5X variants compatible with the original part?

A: Yes. The X designation indicates an extended temperature or performance variant, but electrical specifications remain identical for the 3.3V 150mA configuration. These parts are fully compatible substitutes.

Q: Why should LP2985-33DBVRE4 be avoided?

A: This part is discontinued at DiGi Electronics, indicating limited future availability. While parametrically equivalent, it should not be selected for new designs or long-term production requirements.

Q: Does the quiescent current difference in LP2985-33DBVT affect substitution suitability?

A: The LP2985-33DBVT shows 125 µA quiescent current versus 95 µA in the primary part. This 30 µA difference is within acceptable tolerance for most applications but should be verified in power-sensitive designs where standby current is critical.

Q: Are all substitute parts available in SOT-23-5 packaging?

A: Yes. All listed substitutes use the SOT-23-5 (SC-74A) package type, ensuring mechanical and electrical compatibility with existing PCB layouts and sockets.

Q: What is the significance of REACH Affected versus REACH Unaffected status?

A: REACH Affected status (LP2985AIM5-3.3) indicates the part may contain substances of concern under REACH regulations. REACH Unaffected parts are preferred for applications subject to strict chemical compliance requirements. Most substitutes show REACH Unaffected status.

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