LP3982IMMX-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3982IMMX-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This device delivers 300mA output current in an 8-VSSOP surface mount package and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for new designs, production continuity, and component sourcing flexibility.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP3982IMMX-ADJ
Product Status	Obsolete
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	6V
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	6V
Voltage Dropout (Max)	220mV
Current - Output	300mA
Current - Quiescent (Iq)	270 µA
Control Features	Enable
Protection Features	Over Current, Over Temperature
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

Substitution for the LP3982IMMX-ADJ is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Output Configuration: Positive
Output Type: Adjustable
Number of Regulators: 1
Voltage - Input (Max): 6V or higher
Voltage - Output (Min/Fixed): 1.25V or lower
Voltage - Output (Max): 6V or higher
Current - Output: 300mA
Current - Quiescent (Iq): 270 µA
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount
Package / Case: 8-TSSOP, 8-MSOP compatible

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents: Parts from Texas Instruments and National Semiconductor with identical electrical specifications and packaging, differing only in product status or packaging format.

Parametric Equivalents: Parts with matching electrical performance characteristics but potentially different product lifecycle status.

Manufacturer Recommended Alternatives: Parts from Analog Devices Inc./Maxim Integrated (MAX8860 series) that meet or exceed electrical specifications with enhanced protection features and improved dropout voltage performance.

Parameter Comparison

Parameter	LP3982IMMX-ADJ	LP3982IMM-ADJ/NOPB	LP3982IMMX-ADJ/NOPB	LP3982IMM-ADJ	MAX8860EUA18+T	MAX8860EUA27+T	MAX8860EUA30+T	MAX8860EUA33+
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor	Texas Instruments	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim
Product Status	Obsolete	Active	Active	Last Time Buy	Active	Active	Active	Active
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)
Voltage - Input (Max)	6V	6V	6V	6V	6.5V	6.5V	6.5V	6.5V
Voltage - Output (Min/Fixed)	1.25V	1.25V	1.25V	1.25V	1.25V (1.8V)	1.25V (2.77V)	1.25V (3V)	1.25V (3.3V)
Voltage - Output (Max)	6V	6V	6V	6V	6.5V	6.5V	6.5V	6.5V
Voltage Dropout (Max)	220mV	220mV	220mV	220mV	0.155V @ 300mA (Typ)	0.155V @ 300mA (Typ)	0.155V @ 300mA (Typ)	0.155V @ 300mA (Typ)
Current - Output	300mA	300mA	300mA	300mA	300mA	300mA	300mA	300mA
Current - Quiescent (Iq)	270 µA	270 µA	270 µA	270 µA	270 µA	270 µA	270 µA	270 µA
Control Features	Enable	Enable	Enable	Enable	Enable, Fault Output	Enable, Fault Output	Enable, Fault Output	Enable, Fault Output
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	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	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production and New Designs:

LP3982IMM-ADJ/NOPB is the primary direct substitute. This part maintains identical electrical specifications and packaging while offering Active product status and ROHS3 compliance. It is available in Cut Tape and Digi-Reel packaging formats with substantial inventory (24,522 units).

For Legacy System Maintenance:

LP3982IMM-ADJ serves as a parametric equivalent with Last Time Buy status and ROHS3 compliance. This part is suitable for sustaining production of existing designs where component continuity is required. Inventory availability is 15,652 units.

For Enhanced Performance Requirements:

The MAX8860 series (MAX8860EUA18+T, MAX8860EUA27+T, MAX8860EUA30+T, MAX8860EUA33+) from Analog Devices Inc./Maxim Integrated provides superior electrical performance with reduced dropout voltage (0.155V typical at 300mA versus 220mV maximum), enhanced protection features including Reverse Polarity and Short Circuit protection, and Fault Output control capability. These parts are Active with ROHS3 compliance. Selection within the MAX8860 series depends on fixed output voltage requirements: 1.8V, 2.77V, 3V, or 3.3V configurations are available.

All substitute parts maintain compatibility with the 8-TSSOP/8-MSOP package footprint and operating temperature range of -40°C to 85°C.

Frequently Asked Questions (FAQ)

Q: Can LP3982IMM-ADJ/NOPB be used as a direct replacement for LP3982IMMX-ADJ?

A: Yes. Both parts share identical electrical specifications including output configuration, adjustable output type, 300mA current rating, 1.25V to 6V output range, 220mV maximum dropout voltage, and 270 µA quiescent current. Both use the 8-VSSOP package. The primary difference is product status: LP3982IMM-ADJ/NOPB is Active while LP3982IMMX-ADJ is Obsolete.

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

A: These parts are electrically and mechanically identical. The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging. Both are available from Texas Instruments with ROHS3 compliance and Active product status.

Q: Are MAX8860 parts compatible with LP3982IMMX-ADJ applications?

A: MAX8860 parts are parametrically compatible and meet or exceed the electrical specifications of LP3982IMMX-ADJ. Key differences include improved dropout voltage performance (0.155V typical versus 220mV maximum), additional protection features (Reverse Polarity and Short Circuit protection), and Fault Output capability. MAX8860 parts are available in fixed output voltage configurations (1.8V, 2.77V, 3V, 3.3V) or adjustable mode. Pin-to-pin compatibility with the 8-TSSOP/8-MSOP package is maintained.

Q: What packaging formats are available for substitute parts?

A: LP3982IMM-ADJ/NOPB is available in Cut Tape (CT) and Digi-Reel format. LP3982IMMX-ADJ/NOPB is supplied in Bulk packaging. MAX8860 series parts are available in Tape & Reel (TR) format, with MAX8860EUA33+ also available in Tube packaging.

Q: Does RoHS compliance affect substitution decisions?

A: LP3982IMMX-ADJ is RoHS non-compliant. For applications requiring RoHS3 compliance, LP3982IMM-ADJ/NOPB, LP3982IMM-ADJ, or any MAX8860 series part are suitable alternatives, as all are ROHS3 compliant.

Q: What is the inventory status for these substitute parts?

A: LP3982IMM-ADJ/NOPB has 24,522 units in stock. LP3982IMM-ADJ has 15,652 units. MAX8860EUA33+ has 2,500 units, MAX8860EUA30+T has 2,790 units, MAX8860EUA18+T has 2,040 units, and MAX8860EUA27+T has 1,107 units available.

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