LP2985-30DBVRG4 Equivalent & Substitute Parts

Part Overview

The LP2985-30DBVRG4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3V output at 150mA in SOT-23-5 surface mount packaging. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and production requirements. The device provides low-noise, low-dropout regulation with integrated protection features including over-current, over-temperature, and short-circuit protection, making it suitable for battery-powered and low-power applications requiring stable 3V rails.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
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 for the LP2985-30DBVRG4 is determined by strict equivalence across the following critical parameters: fixed 3V output voltage, 150mA output current capability, SOT-23-5 package format, maximum 16V input voltage rating, dropout voltage performance at rated current, quiescent current characteristics, and operating temperature range of -40°C to 125°C. All substitute parts must maintain identical electrical performance within these specifications to ensure direct functional replacement without circuit redesign.

Substitute parts are categorized as follows:

MFR Recommended Substitutes: Parts actively recommended by manufacturers as direct replacements, maintaining full parametric equivalence and current product status.

Parametric Equivalents: Parts with identical electrical specifications and package format but potentially different product status or packaging configuration (tape & reel versus cut tape).

Cross-Manufacturer Alternatives: Parts from alternative manufacturers (STMicroelectronics) meeting identical electrical and mechanical specifications.

Higher Current Alternatives: Parts with increased output current capability (250mA) suitable for applications requiring additional current margin while maintaining 3V output and SOT-23-5 packaging.

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage	Quiescent Current	Product Status	Package Type
LP2985-30DBVRG4	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Discontinued	SOT-23-5
LP2985IM5X-3.0/NOPB	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5
LP2985-30DBVR	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5
LP2985-30DBVT	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Last Time Buy	SOT-23-5
LP2985A-30DBVR	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5
LP2985A-30DBVT	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5
LP2985AIM5-3.0/NOPB	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5
LP2985AIM5X-3.0/NOPB	National Semiconductor	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5
LP2985IM5-3.0/NOPB	Texas Instruments	150mA	0.58V @ 150mA	95 µA	Active	SOT-23-5
LD2985BM30R	STMicroelectronics	150mA	0.575V @ 150mA	150 µA	Active	SOT-23-5
LP2992IM5-3.0/NOPB	Texas Instruments	250mA	0.85V @ 250mA	95 µA	Active	SOT-23-5

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement): LP2985IM5X-3.0/NOPB, LP2985-30DBVR, LP2985A-30DBVR, and LP2985AIM5-3.0/NOPB are active Texas Instruments products with identical electrical specifications and SOT-23-5 packaging. These parts provide direct functional equivalence with current product availability and full RoHS3 compliance.

Secondary Substitutes (Parametric Equivalents): LP2985-30DBVT and LP2985A-30DBVT maintain identical electrical performance but carry Last Time Buy or limited availability status. These are suitable for immediate requirements but not recommended for new long-term production planning.

Cross-Manufacturer Alternative: LD2985BM30R from STMicroelectronics provides equivalent 150mA output current and 3V fixed output in SOT-23-5 packaging. Quiescent current is slightly elevated at 150 µA versus 95 µA, and dropout voltage is marginally lower at 0.575V. This part is suitable for applications where the minor parameter variations are acceptable and cross-manufacturer sourcing is required.

Higher Current Option: LP2992IM5-3.0/NOPB offers 250mA output current in the same SOT-23-5 package, suitable for designs requiring additional current margin. Dropout voltage increases to 0.85V at rated current. This part is appropriate only when the application can accommodate the higher dropout voltage and increased current requirement does not introduce thermal or layout constraints.

Frequently Asked Questions (FAQ)

Q: Can LP2985-30DBVRG4 be directly replaced with LP2985IM5X-3.0/NOPB?

A: Yes. Both parts deliver identical electrical specifications: 3V fixed output, 150mA current, 0.58V dropout voltage, 95 µA quiescent current, and SOT-23-5 packaging. The primary difference is packaging configuration (cut tape versus tape & reel) and product status (discontinued versus active). Electrical performance and PCB footprint are identical.

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

A: Both variants maintain identical electrical specifications for the 3V 150mA configuration. The "A" designation indicates a product line variant from Texas Instruments. Both are suitable substitutes with no functional differences in the specified parameters.

Q: Is LD2985BM30R from STMicroelectronics a suitable replacement?

A: LD2985BM30R is functionally equivalent for 3V 150mA regulation in SOT-23-5 packaging. Quiescent current is 150 µA versus 95 µA, and dropout voltage is 0.575V versus 0.58V. These minor differences are acceptable in most applications. Use this part when cross-manufacturer sourcing is required or when Texas Instruments parts are unavailable.

Q: Can I use LP2992IM5-3.0/NOPB as a substitute?

A: LP2992IM5-3.0/NOPB is a higher-current variant (250mA) in the same SOT-23-5 package with 3V output. Dropout voltage increases to 0.85V at 250mA. This part is suitable only if your application can tolerate the higher dropout voltage and does not require the additional current. It is not recommended as a direct replacement for 150mA designs.

Q: What packaging options are available for LP2985 3V 150mA regulators?

A: Available packaging configurations include cut tape (CT), tape & reel (TR), and Digi-Reel. All variants use SOT-23-5 (SC-74A) surface mount package. Selection depends on procurement and assembly requirements. Electrical performance is identical across all packaging options.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. Moisture sensitivity level is MSL 1 (unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Q: What is the significance of the NOPB suffix in part numbers?

A: NOPB indicates "No Plumbum" (lead-free) packaging, confirming RoHS compliance. Parts with this suffix meet lead-free soldering requirements for modern manufacturing processes.

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