LP2966IMMX-3325 Equivalent & Substitute Parts

Part Overview

The LP2966IMMX-3325 is a linear voltage regulator IC from Texas Instruments designed for positive fixed dual-output applications. This device delivers 150mA output current with fixed voltage outputs of 3.3V and 2.5V, housed in an 8-VSSOP surface mount package. The main part number is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Number of Regulators	2
Voltage - Output (Fixed)	3.3V, 2.5V
Voltage - Input (Max)	7V
Current - Output	150mA
Voltage Dropout (Max)	0.27V @ 150mA
Operating Temperature	-40°C ~ 125°C
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LP2966IMMX-3325 is determined by strict equivalence across the following critical parameters:

Dual positive fixed output voltage configuration (3.3V and 2.5V)
150mA output current capability
Maximum input voltage of 7V
Dropout voltage of 0.27V @ 150mA
8-VSSOP package footprint compatibility
Surface mount technology
Identical protection features (Over Current, Over Temperature, Short Circuit)
Operating temperature range of -40°C ~ 125°C

The substitute parts identified maintain full electrical and mechanical compatibility with the original part number across all specified parameters.

Parameter Comparison

Parameter	LP2966IMMX-3325	LP2966IMMX-3325/NOPB	LP2966IMM-3325/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive	Positive	Positive
Number of Regulators	2	2	2
Voltage - Output (Fixed)	3.3V, 2.5V	3.3V, 2.5V	3.3V, 2.5V
Voltage - Input (Max)	7V	7V	7V
Current - Output	150mA	150mA	150mA
Voltage Dropout (Max)	0.27V @ 150mA	0.27V @ 150mA	0.27V @ 150mA
Current - Quiescent (Iq)	300 µA	300 µA	300 µA
PSRR	60dB ~ 40dB (120Hz)	60dB ~ 40dB (120Hz)	60dB ~ 40dB (120Hz)
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
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)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both LP2966IMMX-3325/NOPB and LP2966IMM-3325/NOPB are active product alternatives to the obsolete LP2966IMMX-3325. Selection between these substitutes should be based on the following factors:

Product Status: The original part number is obsolete. Both substitute parts are active products with ongoing manufacturer support and availability.

Compliance: LP2966IMMX-3325/NOPB and LP2966IMM-3325/NOPB are both ROHS3 compliant, whereas the original part is RoHS non-compliant. For applications requiring RoHS compliance, either substitute part satisfies regulatory requirements.

Packaging Format: LP2966IMMX-3325/NOPB and LP2966IMM-3325/NOPB are supplied in Tape & Reel (TR) format, suitable for automated assembly processes. The original part was supplied in bulk packaging.

Electrical Equivalence: All three part numbers maintain identical electrical specifications across output voltage, current capacity, dropout voltage, protection features, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can LP2966IMMX-3325/NOPB directly replace LP2966IMMX-3325?

A: Yes. LP2966IMMX-3325/NOPB is electrically and mechanically equivalent to LP2966IMMX-3325. Both share identical output voltages (3.3V and 2.5V), 150mA current capacity, 8-VSSOP package footprint, and all electrical specifications. The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What is the difference between LP2966IMMX-3325/NOPB and LP2966IMM-3325/NOPB?

A: Both parts are parametrically equivalent with identical electrical specifications and package footprints. The difference lies in the device package designation within the part number nomenclature. Both are active products supplied in Tape & Reel format and are ROHS3 compliant.

Q: Are the substitute parts compatible with existing PCB designs for LP2966IMMX-3325?

A: Yes. Both substitute parts use the 8-VSSOP package with identical pin configuration and footprint dimensions (0.118", 3.00mm width). No PCB layout modifications are required.

Q: What is the significance of the "/NOPB" suffix in the substitute part numbers?

A: The "/NOPB" suffix indicates the part is supplied in Tape & Reel (TR) packaging without plumbum (lead-free). This is standard for active production parts and indicates RoHS3 compliance.

Q: Can I use these substitutes in applications requiring RoHS compliance?

A: Yes. Both LP2966IMMX-3325/NOPB and LP2966IMM-3325/NOPB are ROHS3 compliant. The original LP2966IMMX-3325 is RoHS non-compliant and should not be used in applications with RoHS requirements.

Q: Are there any thermal or performance differences between the substitute parts and the original?

A: No. All three part numbers maintain identical thermal characteristics, dropout voltage (0.27V @ 150mA), quiescent current (300 µA), and PSRR specifications (60dB ~ 40dB at 120Hz).

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