LP2985A-50DBVRG4 Equivalent & Substitute Parts

Part Overview

The LP2985A-50DBVRG4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 150mA in SOT-23-5 surface mount packaging. This part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and production requirements. The device provides integrated protection features including over-current, over-temperature, and short-circuit protection, with an enable control feature for power management applications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	5V
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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LP2985A-50DBVRG4 is categorized into two groups based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical electrical specifications: 5V fixed output, 150mA output current, 0.58V dropout voltage at 150mA, 95 µA quiescent current, 45dB PSRR, and SOT-23-5 packaging. These parts differ only in packaging variants (tape/reel configurations) or product status (active vs. discontinued). Parametric equivalents include LP2985-50DBVR, LP2985-50DBVT, LP2985A-50DBVR, LP2985A-50DBVT, LP2985AIM5-5.0/NOPB, and LP2985AIM5X-5.0/NOPB.

Manufacturer Recommended Substitutes are higher-capacity alternatives from the same manufacturer family. The LP2992 series provides increased output current capability (250mA vs. 150mA) while maintaining the same 5V output voltage, 16V maximum input voltage, SOT-23-5 package, and protection features. The dropout voltage increases to 0.85V @ 250mA due to the higher current rating. These parts are suitable for applications requiring additional current headroom within the same form factor.

Parameter Comparison

Parameter	LP2985A-50DBVRG4	LP2985-50DBVR	LP2985-50DBVT	LP2985A-50DBVR	LP2985A-50DBVT	LP2985AIM5-5.0/NOPB	LP2985AIM5X-5.0/NOPB	LP2992AIM5-5.0/NOPB	LP2992AIM5X-5.0/NOPB	LP2992IM5-5.0/NOPB
Output Voltage	5V	5V	5V	5V	5V	5V	5V	5V	5V	5V
Output Current	150mA	150mA	150mA	150mA	150mA	150mA	150mA	250mA	250mA	250mA
Input Voltage (Max)	16V	16V	16V	16V	16V	16V	16V	16V	16V	16V
Dropout Voltage (Max)	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.58V @ 150mA	0.85V @ 250mA	0.85V @ 250mA	0.85V @ 250mA
Quiescent Current	95 µA	95 µA	95 µA	95 µA	95 µA	95 µA	95 µA	95 µA	95 µA	95 µA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For direct replacement of the discontinued LP2985A-50DBVRG4, select from the parametric equivalent group: LP2985A-50DBVR, LP2985A-50DBVT, LP2985AIM5-5.0/NOPB, or LP2985AIM5X-5.0/NOPB. All maintain identical electrical performance and are currently in active production status with ROHS3 compliance. LP2985A-50DBVR offers the highest inventory availability (80,100 pcs) for production volume requirements.

For applications where output current capacity can be increased to 250mA without circuit redesign, the LP2992 series (LP2992AIM5-5.0/NOPB, LP2992AIM5X-5.0/NOPB, or LP2992IM5-5.0/NOPB) provides manufacturer-recommended alternatives. These parts maintain identical packaging, input voltage rating, and protection features while offering 67% higher output current capability. The increased dropout voltage (0.85V vs. 0.58V) must be evaluated against application power budget requirements.

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.

Frequently Asked Questions (FAQ)

Q: Can LP2992 series parts directly replace LP2985A-50DBVRG4 in existing designs?

A: LP2992 parts are pin-compatible and use identical SOT-23-5 packaging. However, the increased dropout voltage (0.85V @ 250mA vs. 0.58V @ 150mA) affects power dissipation and thermal performance. Verify that your application's input voltage headroom and thermal design accommodate the higher dropout voltage before substitution.

Q: What is the difference between LP2985A-50DBVR and LP2985AIM5-5.0/NOPB?

A: Both are parametric equivalents with identical electrical specifications. The primary difference is packaging configuration: LP2985A-50DBVR uses cut tape and Digi-Reel packaging, while LP2985AIM5-5.0/NOPB uses the same format with lead-free (NOPB) designation. Select based on your procurement and assembly requirements.

Q: Why is the original LP2985A-50DBVRG4 discontinued?

A: The part is discontinued at DiGi Electronics, but active parametric equivalents remain available from Texas Instruments. The LP2985 base product line continues in production under variant part numbers. Inventory of the original part number is no longer being replenished.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended parametric equivalents and LP2992 alternatives are ROHS3 compliant. The LP2985AIM5-5.0 variant (without /NOPB designation) is RoHS non-compliant and REACH affected; avoid this part number for new designs requiring regulatory compliance.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB designation indicates lead-free (No Lead) and halogen-free construction, meeting RoHS3 requirements. Parts without this suffix may contain lead and are not suitable for applications requiring RoHS compliance.

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