LP2985IM5X-1.8/NOPB Equivalent & Substitute Parts

Part Overview

The LP2985IM5X-1.8/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed for positive fixed 1.8V output applications with 150mA current capacity in a SOT-23-5 surface mount package. This device operates across -40°C to 125°C and includes integrated protection features for over-current, over-temperature, and short-circuit conditions. The part is currently in active product status with 8,230 units in stock.

Equivalent and substitute parts are identified when product availability changes, manufacturing transitions occur, or when alternative packaging formats are required for specific assembly processes while maintaining identical electrical performance and mechanical compatibility.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
Package Type	SOT-23-5 (SC-74A)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP2985IM5X-1.8/NOPB are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Texas Instruments LP2985 Series): Parts LP2985-18DBVR, LP2985-18DBVT, LP2985A-18DBVJ, LP2985A-18DBVR, LP2985A-18DBVT, and LP2985AIM5-1.8/NOPB maintain identical electrical specifications including 1.8V output, 150mA current capacity, 0.58V dropout voltage, and 95µA quiescent current. These parts differ only in packaging format (Tape & Reel, Cut Tape, or Digi-Reel) and product status. All share the same SOT-23-5 package footprint and are manufactured by Texas Instruments or National Semiconductor.

Manufacturer Recommended Alternatives: Parts LD2985BM18R (STMicroelectronics) and LT1761ES5-1.8#TRMPBF/LT1761ES5-1.8#TRPBF (Analog Devices Inc.) provide functional equivalence with minor parameter variations. These alternatives maintain 1.8V output and SOT-23-5 package compatibility but differ in quiescent current, dropout voltage, and maximum input voltage specifications.

Key parameters determining substitution eligibility: output voltage (1.8V fixed), output current (150mA minimum), package type (SOT-23-5), operating temperature range (-40°C to 125°C), and control/protection feature set.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage @ 150mA	Quiescent Current	Input Voltage (Max)	Package	Packaging Format	Product Status	Inventory
LP2985IM5X-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V	95 µA	16V	SOT-23-5	Tape & Reel	Active	8,230
LP2985-18DBVR	Texas Instruments	1.8V	150mA	0.58V	95 µA	16V	SOT-23-5	Tape & Reel	Active	80,300
LP2985-18DBVT	Texas Instruments	1.8V	150mA	0.58V	95 µA	16V	SOT-23-5	Cut Tape	Last Time Buy	1,821
LP2985A-18DBVJ	Texas Instruments	1.8V	150mA	0.58V	95 µA	16V	SOT-23-5	Cut Tape	Last Time Buy	21,407
LP2985A-18DBVR	Texas Instruments	1.8V	150mA	0.58V	95 µA	16V	SOT-23-5	Cut Tape & Digi-Reel	Active	1,206
LP2985A-18DBVT	Texas Instruments	1.8V	150mA	0.58V	95 µA	16V	SOT-23-5	Cut Tape	Last Time Buy	4,428
LP2985AIM5-1.8/NOPB	National Semiconductor	1.8V	150mA	0.58V	95 µA	16V	SOT-23-5	Not Specified	Active	4,300
LP2985IM5-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V	95 µA	16V	SOT-23-5	Cut Tape & Digi-Reel	Active	4,100
LD2985BM18R	STMicroelectronics	1.8V	150mA	0.575V	150 µA	16V	SOT-23-5	Tape & Reel	Active	17,747
LT1761ES5-1.8#TRMPBF	Analog Devices Inc.	1.8V	100mA	0.45V @ 100mA	Not Specified	20V	TSOT-23-5	Cut Tape & Digi-Reel	Active	3,700
LT1761ES5-1.8#TRPBF	Analog Devices Inc.	1.8V	100mA	0.45V @ 100mA	Not Specified	20V	TSOT-23-5	Cut Tape & Digi-Reel	Active	18,156

Engineering Selection Recommendations

Direct Parametric Equivalents: LP2985-18DBVR, LP2985A-18DBVR, and LP2985IM5-1.8/NOPB are recommended as primary substitutes. These parts maintain identical electrical specifications and SOT-23-5 package compatibility. Selection between these options depends on packaging format requirements: Tape & Reel for automated assembly processes, or Cut Tape/Digi-Reel for manual or semi-automated operations. All are ROHS3 compliant with MSL 1 rating.

Alternative Consideration: LD2985BM18R (STMicroelectronics) provides functional equivalence with slightly elevated quiescent current (150µA vs. 95µA) and marginally lower dropout voltage (0.575V vs. 0.58V). This part is suitable for applications where the 55µA quiescent current difference is acceptable and higher input voltage tolerance is not required.

Limited Current Applications: LT1761ES5-1.8#TRPBF and LT1761ES5-1.8#TRMPBF (Analog Devices Inc.) are suitable only for applications requiring maximum 100mA output current. These parts offer superior dropout voltage performance (0.45V) and higher maximum input voltage (20V) but are not direct substitutes for 150mA-rated designs.

Product Status Consideration: Parts marked "Last Time Buy" (LP2985-18DBVT, LP2985A-18DBVJ, LP2985A-18DBVT) have limited remaining inventory and should be avoided for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can LP2985-18DBVR replace LP2985IM5X-1.8/NOPB directly? A: Yes. Both parts are Texas Instruments LP2985 series regulators with identical electrical specifications (1.8V output, 150mA current, 0.58V dropout voltage, 95µA quiescent current) and SOT-23-5 package footprint. The difference is packaging format: LP2985-18DBVR is supplied in Tape & Reel, while LP2985IM5X-1.8/NOPB is also Tape & Reel. Both are ROHS3 compliant and suitable for direct PCB substitution.

Q: What is the difference between Cut Tape and Tape & Reel packaging? A: Tape & Reel packaging is supplied on continuous carrier tape wound on reels, optimized for high-volume automated pick-and-place assembly. Cut Tape is the same carrier tape cut into smaller segments, suitable for lower-volume manual or semi-automated assembly. Electrical performance and package footprint are identical; selection depends on assembly process requirements.

Q: Can LT1761ES5-1.8#TRPBF be used in place of LP2985IM5X-1.8/NOPB? A: No, not for applications requiring 150mA output current. The LT1761ES5-1.8#TRPBF is rated for maximum 100mA output, making it unsuitable for designs drawing 150mA. However, it offers superior dropout voltage (0.45V vs. 0.58V) and higher input voltage tolerance (20V vs. 16V) for lower-current applications.

Q: What does "Last Time Buy" product status mean? A: Last Time Buy indicates the manufacturer has announced end-of-life for that part number. Remaining inventory is limited and will not be replenished. These parts should not be selected for new designs requiring long-term production support.

Q: Are all substitute parts ROHS3 compliant? A: All Texas Instruments LP2985 series parts (LP2985-18DBVR, LP2985A-18DBVR, LP2985IM5-1.8/NOPB, LP2985A-18DBVJ, LP2985A-18DBVT, LP2985-18DBVT) are ROHS3 compliant with MSL 1 rating. STMicroelectronics LD2985BM18R is also ROHS3 compliant. Analog Devices LT1761ES5 series parts are ROHS3 compliant. Compliance status is identical across all listed substitutes.

Q: Does quiescent current difference between LP2985 (95µA) and LD2985BM18R (150µA) affect circuit design? A: The 55µA difference is significant only in ultra-low-power standby applications where quiescent current dominates total power consumption. For standard applications, this difference is negligible. LD2985BM18R remains functionally equivalent for most use cases.

Q: Can I mix packaging formats in the same production run? A: Packaging format selection should be consistent within a production batch to maintain assembly process continuity. Mixing Tape & Reel with Cut Tape requires different feeder configurations on pick-and-place equipment. Consult your assembly partner regarding format compatibility with existing tooling.

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