LP3982IMM-1.8 Equivalent & Substitute Parts

Part Overview

The LP3982IMM-1.8 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive 1.8V output at 300mA with a maximum dropout voltage of 0.22V at 200mA. The device integrates over-current, over-temperature, and reverse-polarity protection, operating across the industrial temperature range of -40°C to 85°C in an 8-VSSOP surface-mount package.

The LP3982IMM-1.8 carries a "Not For New Designs" product status and is RoHS non-compliant. For new applications or designs requiring updated compliance standards, equivalent substitute parts with active product status and RoHS3 compliance are available within the same electrical and mechanical parameter envelope.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	1.8V
Voltage - Input (Max)	6V
Current - Output	300mA
Voltage Dropout (Max)	0.22V @ 200mA
Current - Quiescent (Iq)	270 µA
Control Features	Enable
Protection Features	Over Current, Over Temperature, Reverse Polarity
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package	8-VSSOP
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LP3982IMM-1.8 are classified into two functional categories based on electrical and mechanical compatibility:

Direct Equivalents (Texas Instruments LP3982 Series)

These parts maintain identical electrical specifications and fixed 1.8V output configuration. Substitution is based on matching the following critical parameters: positive fixed output type, 1.8V output voltage, 300mA output current, 0.22V maximum dropout voltage at 200mA, 270 µA quiescent current, identical protection features (over-current, over-temperature, reverse-polarity), and 8-VSSOP package compatibility. Differences exist only in packaging format (Tape & Reel vs. bulk) and product status (Active vs. Not For New Designs).

Parametric Equivalents (Analog Devices MAX8860 Series)

These parts provide functional substitution through adjustable output configuration with fixed-output capability. Substitution is based on matching: positive output configuration, 300mA output current, 270 µA quiescent current, identical operating temperature range (-40°C to 85°C), 8-TSSOP/8-MSOP package footprint compatibility, and identical protection feature set (over-temperature, reverse-polarity, short-circuit). The MAX8860 series offers lower dropout voltage (0.155V @ 300mA typical vs. 0.22V @ 200mA) and higher maximum input voltage (6.5V vs. 6V). Output voltage variants (1.8V, 2.77V, 3V, 3.3V) are available through fixed-output configuration.

Parameter Comparison

Parameter	LP3982IMM-1.8	LP3982IMM-1.8/NOPB	LP3982IMMX-1.8/NOPB	MAX8860EUA18+T	MAX8860EUA27+T	MAX8860EUA30+T	MAX8860EUA33+
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Fixed	Fixed	Fixed	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)
Voltage - Output (Fixed)	1.8V	1.8V	1.8V	1.8V	2.77V	3V	3.3V
Voltage - Input (Max)	6V	6V	6V	6.5V	6.5V	6.5V	6.5V
Current - Output	300mA	300mA	300mA	300mA	300mA	300mA	300mA
Voltage Dropout (Max)	0.22V @ 200mA	0.22V @ 200mA	0.22V @ 200mA	0.155V @ 300mA (Typ)	0.155V @ 300mA (Typ)	0.155V @ 300mA (Typ)	0.155V @ 300mA (Typ)
Current - Quiescent (Iq)	270 µA	270 µA	270 µA	270 µA	270 µA	270 µA	270 µA
Control Features	Enable	Enable	Enable	Enable, Fault Output	Enable, Fault Output	Enable, Fault Output	Enable, Fault Output
Protection Features	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit	Over Temperature, Reverse Polarity, Short Circuit
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package	8-VSSOP	8-VSSOP	8-VSSOP	8-uMAX/uSOP	8-uMAX/uSOP	8-uMAX/uSOP	8-uMAX/uSOP
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Same Output Voltage)

LP3982IMM-1.8/NOPB and LP3982IMMX-1.8/NOPB are direct functional equivalents with identical electrical specifications and fixed 1.8V output. Both carry Active product status and ROHS3 compliance, addressing the obsolescence and regulatory concerns of the original LP3982IMM-1.8. LP3982IMM-1.8/NOPB is supplied in Tape & Reel format with 15,800 units in stock. LP3982IMMX-1.8/NOPB is supplied in Cut Tape & Digi-Reel format with 5,815 units in stock. Selection between these two depends on procurement and assembly requirements.

For Parametric Substitution (Alternative Output Voltages)

The MAX8860 series (MAX8860EUA18+T, MAX8860EUA27+T, MAX8860EUA30+T, MAX8860EUA33+) provides functional substitution with improved electrical performance and regulatory compliance. All variants feature Active product status and ROHS3 compliance. The MAX8860EUA18+T maintains 1.8V fixed output, matching the original part's voltage specification while offering lower dropout voltage (0.155V @ 300mA typical vs. 0.22V @ 200mA). Alternative voltage variants (2.77V, 3V, 3.3V) are available for applications requiring different output levels within the same 300mA current envelope. All MAX8860 variants include Fault Output control feature and Short Circuit protection in addition to the original part's protection set.

Frequently Asked Questions (FAQ)

Q: Can LP3982IMM-1.8/NOPB be used as a direct replacement for LP3982IMM-1.8?

A: Yes. LP3982IMM-1.8/NOPB is a direct equivalent with identical electrical specifications, fixed 1.8V output, 300mA current rating, and 8-VSSOP package compatibility. The primary differences are Active product status (vs. Not For New Designs) and ROHS3 compliance (vs. RoHS non-compliant). Packaging format differs (Tape & Reel vs. bulk).

Q: What is the difference between LP3982IMMX-1.8/NOPB and LP3982IMM-1.8/NOPB?

A: Both are direct electrical equivalents with identical specifications and 1.8V fixed output. The difference is packaging format: LP3982IMM-1.8/NOPB uses Tape & Reel, while LP3982IMMX-1.8/NOPB uses Cut Tape & Digi-Reel. Selection depends on assembly line requirements and procurement preferences.

Q: Can MAX8860 series parts replace the LP3982IMM-1.8?

A: MAX8860 series parts provide functional substitution with improved performance characteristics. All variants maintain 300mA output current, 270 µA quiescent current, identical operating temperature range, and 8-TSSOP/8-MSOP package footprint compatibility. MAX8860EUA18+T matches the 1.8V output voltage. Alternative variants (MAX8860EUA27+T, MAX8860EUA30+T, MAX8860EUA33+) provide 2.77V, 3V, and 3.3V fixed outputs respectively. MAX8860 series offers lower dropout voltage (0.155V @ 300mA typical) and higher maximum input voltage (6.5V vs. 6V).

Q: What are the key electrical differences between LP3982 and MAX8860 series?

A: Both maintain 300mA output current and 270 µA quiescent current. MAX8860 series offers lower dropout voltage (0.155V @ 300mA typical vs. 0.22V @ 200mA for LP3982), higher maximum input voltage (6.5V vs. 6V), and additional Fault Output control feature. MAX8860 replaces Over Current protection with Short Circuit protection. Both operate across -40°C to 85°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LP3982IMM-1.8/NOPB, LP3982IMMX-1.8/NOPB, and all MAX8860 variants (MAX8860EUA18+T, MAX8860EUA27+T, MAX8860EUA30+T, MAX8860EUA33+) are ROHS3 compliant. The original LP3982IMM-1.8 is RoHS non-compliant.

Q: What is the package compatibility between LP3982 and MAX8860 series?

A: Both use 8-pin surface-mount packages with identical footprint dimensions (8-TSSOP, 8-MSOP, 0.118" width, 3.00mm). LP3982 uses 8-VSSOP supplier package designation, while MAX8860 uses 8-uMAX/uSOP designation. Pin-to-pin compatibility requires verification against device datasheets for specific application circuits.

Q: Which substitute part has the highest inventory availability?

A: LP3982IMM-1.8/NOPB has the highest inventory with 15,800 units in stock, followed by LP3982IMMX-1.8/NOPB with 5,815 units. Among MAX8860 variants, MAX8860EUA30+T has 2,790 units, MAX8860EUA33+ has 2,500 units, MAX8860EUA18+T has 2,040 units, and MAX8860EUA27+T has 1,107 units.

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