LP2985A-33DBVRG4 Equivalent & Substitute Parts

Part Overview

The LP2985A-33DBVRG4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 150mA in a SOT-23-5 surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing production and design 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
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
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

Substitute parts for the LP2985A-33DBVRG4 are categorized based on strict electrical and mechanical compatibility:

Manufacturer Recommended Substitutes (Direct Replacements): Parts with identical output voltage (3.3V), output current (150mA), dropout voltage (0.58V @ 150mA), quiescent current (95 µA), package (SOT-23-5), and operating temperature range (-40°C to 125°C). These include LP2985A-33DBVR and LP2985AIM5X-3.3/NOPB, which differ only in packaging format (Cut Tape & Digi-Reel vs. Tape & Reel).

Higher Current Capacity Alternatives: The LP2992 series (LP2992AIM5-3.3/NOPB, LP2992AIM5X-3.3/NOPB, LP2992IM5-3.3/NOPB, LP2992IM5X-3.3/NOPB) provides 250mA output current while maintaining the same 3.3V output voltage, SOT-23-5 package, and operating temperature range. These parts have a higher dropout voltage of 0.85V @ 250mA and increased quiescent current of 95 µA.

Parametric Equivalents: Parts including LP2985-33DBVR, LP2985-33DBVRE4, LP2985-33DBVT, and LP2985A-33DBVT maintain the same electrical specifications but may differ in packaging format or minor parameter variations (such as quiescent current of 125 µA in LP2985-33DBVT).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage	Quiescent Current	Package	Product Status	Inventory
LP2985A-33DBVRG4	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Discontinued	29,400 Pcs
LP2985A-33DBVR	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	56,200 Pcs
LP2985AIM5X-3.3/NOPB	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	53,200 Pcs
LP2992AIM5-3.3/NOPB	Texas Instruments	3.3V	250mA	0.85V @ 250mA	95 µA	SOT-23-5	Active	29,700 Pcs
LP2992AIM5X-3.3/NOPB	Texas Instruments	3.3V	250mA	0.85V @ 250mA	95 µA	SOT-23-5	Active	23,113 Pcs
LP2992IM5-3.3/NOPB	Texas Instruments	3.3V	250mA	0.85V @ 250mA	95 µA	SOT-23-5	Active	18,800 Pcs
LP2992IM5X-3.3/NOPB	Texas Instruments	3.3V	250mA	0.85V @ 250mA	95 µA	SOT-23-5	Active	18,900 Pcs
LP2985-33DBVR	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	55,200 Pcs
LP2985-33DBVRE4	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Discontinued	2,290 Pcs
LP2985-33DBVT	Texas Instruments	3.3V	150mA	0.575V @ 150mA	125 µA	SOT-23-5	Active	3,330 Pcs
LP2985A-33DBVT	Texas Instruments	3.3V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	12,138 Pcs

Engineering Selection Recommendations

For direct replacement of the discontinued LP2985A-33DBVRG4, select LP2985A-33DBVR or LP2985AIM5X-3.3/NOPB. Both parts maintain identical electrical specifications and are currently in active production status with substantial inventory availability. LP2985A-33DBVR offers the highest inventory level at 56,200 pieces.

For applications requiring higher output current capacity within the same package footprint, the LP2992 series provides 250mA output current. All LP2992 variants (LP2992AIM5-3.3/NOPB, LP2992AIM5X-3.3/NOPB, LP2992IM5-3.3/NOPB, LP2992IM5X-3.3/NOPB) are active products with good inventory levels. The increased dropout voltage (0.85V vs. 0.58V) must be evaluated against circuit power budget requirements.

Parametric equivalents LP2985-33DBVR and LP2985A-33DBVT are suitable alternatives with active product status. LP2985-33DBVT exhibits slightly higher quiescent current (125 µA vs. 95 µA) and marginally lower dropout voltage (0.575V), which may impact power consumption calculations in battery-powered applications.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and identical operating temperature range (-40°C to 125°C). Package compatibility is confirmed across all alternatives in SOT-23-5 format.

Frequently Asked Questions (FAQ)

Q: Can LP2992 series parts directly replace the LP2985A-33DBVRG4?

A: LP2992 parts are pin-compatible and functionally compatible in SOT-23-5 package. The primary difference is increased output current capacity (250mA vs. 150mA) and higher dropout voltage (0.85V vs. 0.58V @ rated current). Verify that the higher dropout voltage does not violate circuit power supply margin requirements before substitution.

Q: What is the difference between LP2985A-33DBVR and LP2985AIM5X-3.3/NOPB?

A: Both parts have identical electrical specifications. The difference is packaging format: LP2985A-33DBVR is supplied in Cut Tape & Digi-Reel format, while LP2985AIM5X-3.3/NOPB is supplied in Tape & Reel format. Select based on your procurement and assembly process requirements.

Q: Why does LP2985-33DBVT show different quiescent current (125 µA)?

A: LP2985-33DBVT is a parametric variant with slightly different internal specifications. While functionally compatible, the higher quiescent current may increase standby power consumption. Evaluate this parameter if the application has strict power budget constraints.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts maintain ROHS3 compliance status, matching the original LP2985A-33DBVRG4 specification.

Q: What packaging options are available for the LP2985 series?

A: All parts in this comparison use SOT-23-5 (SC-74A) package. Packaging format variations (Cut Tape & Digi-Reel vs. Tape & Reel) affect supply and assembly logistics but not electrical or mechanical compatibility.

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