LP2985-33DBVTG4 Equivalent & Substitute Parts

Part Overview

The LP2985-33DBVTG4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications. This Surface Mount device in SOT-23-5 package delivers 150mA output current with integrated protection features including over-current, over-temperature, and short-circuit protection. The part is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 3.3V regulation in compact form factors.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.58V @ 150mA
Quiescent Current (Iq)	95 µA
Package / Case	SC-74A, SOT-753 (SOT-23-5)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP2985-33DBVTG4 are categorized based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Fixed output voltage of 3.3V
Surface Mount packaging in SOT-23-5 form factor
Operating temperature range of -40°C to 125°C
Enable control feature
Over-current, over-temperature, and short-circuit protection
ROHS3 compliance and MSL Level 1

Substitution Categories:

Category 1: Manufacturer Recommended Direct Replacements (Active Status) Parts LP2985IM5X-3.3/NOPB and LP2985A-33DBVR/DBVT maintain identical electrical specifications to the main part (150mA output, 0.58V dropout) with active product status and improved availability. These are sourced in Cut Tape or Tape & Reel packaging formats.

Category 2: Higher Current Capacity Alternatives (LP2992 Series) Parts LP2992AIM5-3.3/NOPB, LP2992AIM5X-3.3/NOPB, LP2992IM5-3.3/NOPB, and LP2992IM5X-3.3/NOPB provide 250mA output current capability with identical 3.3V output and SOT-23-5 packaging. These parts accept higher load currents (250mA vs. 150mA) with slightly increased dropout voltage (0.85V @ 250mA) and quiescent current (4 mA vs. 2.5 mA max supply current). All maintain active product status.

Category 3: Parametric Equivalents (Same Specifications, Different Packaging) Parts LP2985-33DBVR, LP2985-33DBVRE4, LP2985-33DBVT, LP2985A-33DBVR, and LP2985A-33DBVT provide identical 150mA output specifications with variations in packaging format (Cut Tape, Tape & Reel) and product status. LP2985-33DBVRE4 is discontinued at DiGi Electronics; others maintain active status.

Parameter Comparison

Part Number	Manufacturer	Output Current	Voltage Dropout (Max)	Quiescent Current (Iq)	Supply Current (Max)	Product Status	Packaging	Inventory
LP2985-33DBVTG4	Texas Instruments	150mA	0.58V @ 150mA	95 µA	2.5 mA	Last Time Buy	Tape & Reel (TR)	707 Pcs
LP2985IM5X-3.3/NOPB	Texas Instruments	150mA	0.58V @ 150mA	95 µA	2.5 mA	Active	Cut Tape (CT) & Digi-Reel®	33716 Pcs
LP2992AIM5-3.3/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	4 mA	Active	Cut Tape (CT) & Digi-Reel®	29700 Pcs
LP2992AIM5X-3.3/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	4 mA	Active	Cut Tape (CT) & Digi-Reel®	23113 Pcs
LP2992IM5-3.3/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	4 mA	Active	Cut Tape (CT) & Digi-Reel®	18800 Pcs
LP2992IM5X-3.3/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	4 mA	Active	Tape & Reel (TR)	18900 Pcs
LP2985-33DBVR	Texas Instruments	150mA	0.58V @ 150mA	95 µA	2.5 mA	Active	Cut Tape (CT) & Digi-Reel®	55200 Pcs
LP2985-33DBVRE4	Texas Instruments	150mA	0.58V @ 150mA	95 µA	2.5 mA	Discontinued at DiGi Electronics	Tape & Reel (TR)	2290 Pcs
LP2985-33DBVT	Texas Instruments	150mA	0.575V @ 150mA	125 µA	2.5 mA	Active	Not Specified	3330 Pcs
LP2985A-33DBVR	Texas Instruments	150mA	0.58V @ 150mA	95 µA	2.5 mA	Active	Cut Tape (CT) & Digi-Reel®	56200 Pcs
LP2985A-33DBVT	Texas Instruments	150mA	0.58V @ 150mA	95 µA	2.5 mA	Active	Cut Tape (CT) & Digi-Reel®	12138 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): LP2985IM5X-3.3/NOPB, LP2985A-33DBVR, and LP2985A-33DBVT are recommended as primary alternatives. All three maintain 150mA output current, 0.58V dropout voltage, and identical protection features. These parts carry Active product status with significantly higher inventory availability (33716, 56200, and 12138 units respectively) compared to the Last Time Buy LP2985-33DBVTG4 (707 units). All are ROHS3 compliant with MSL Level 1 rating.

For Higher Current Applications: The LP2992 series (LP2992AIM5-3.3/NOPB, LP2992AIM5X-3.3/NOPB, LP2992IM5-3.3/NOPB, LP2992IM5X-3.3/NOPB) provides 250mA output capability in the same SOT-23-5 package. These are suitable when load current exceeds 150mA. Trade-offs include increased dropout voltage (0.85V vs. 0.58V) and higher supply current (4 mA vs. 2.5 mA max). All LP2992 variants maintain Active status with strong inventory levels (18800 to 29700 units).

Packaging Considerations: Cut Tape (CT) & Digi-Reel® packaging is preferred for high-volume production due to superior availability. Tape & Reel (TR) packaging is suitable for automated assembly lines. LP2985-33DBVRE4 should be avoided due to discontinued status despite available inventory.

Frequently Asked Questions (FAQ)

Q: Can LP2992 series parts directly replace LP2985-33DBVTG4 in existing designs? A: LP2992 parts are pin-compatible and functionally compatible in SOT-23-5 packaging. However, the increased dropout voltage (0.85V vs. 0.58V) and higher supply current (4 mA vs. 2.5 mA) must be evaluated against circuit power budget and input voltage margin requirements. Applications with tight input voltage headroom or strict power consumption limits should use LP2985 equivalents instead.

Q: What is the difference between LP2985 and LP2985A variants? A: Both LP2985 and LP2985A variants maintain identical electrical specifications for the 3.3V output version (150mA, 0.58V dropout, 95 µA quiescent current). The "A" designation indicates a product revision. Both are ROHS3 compliant and suitable for new designs.

Q: Why does LP2985-33DBVT show different quiescent current (125 µA vs. 95 µA)? A: LP2985-33DBVT exhibits slightly higher quiescent current specification (125 µA) compared to other LP2985 variants (95 µA). This minor difference should be evaluated in applications with strict standby power requirements. For most applications, this difference is negligible.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory requirements of the main part LP2985-33DBVTG4.

Q: Which substitute offers the best availability? A: LP2985A-33DBVR provides the highest inventory (56200 units) among direct 150mA equivalents. For higher current applications, LP2992AIM5-3.3/NOPB offers strong availability (29700 units) in the 250mA category.

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