LM2990T-5.2 Equivalent & Substitute Parts

Part Overview

The LM2990T-5.2 is a linear voltage regulator IC designed for negative fixed output applications. This device delivers -5.2V at 1.8A output current in a TO-220-3 through-hole package. The part is classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. Equivalent and substitute parts must maintain electrical compatibility across output voltage, current capacity, and thermal performance parameters while accommodating packaging and mounting requirements.

Key Parameters

Parameter	Value
Output Configuration	Negative
Output Type	Fixed
Output Voltage	-5.2V
Output Current	1.8A
Input Voltage (Max)	-26V
Voltage Dropout (Max)	1V @ 1A
Package Type	TO-220-3
Mounting Type	Through Hole
Operating Temperature Range	-40°C to 125°C

Substitute Part Grouping Explanation

Substitution logic for the LM2990T-5.2 is based on the following criteria:

Direct Equivalent (Pin-Compatible, Same Output Voltage): LM2990T-5.2/NOPB maintains identical electrical specifications and package configuration. This part is functionally interchangeable with the original, differing only in product status (active vs. obsolete) and RoHS compliance level.

Functional Alternative (Different Package, Adjustable Output): LM2991SX/NOPB provides negative voltage regulation with adjustable output range (-3V to -24V), accommodating the -5.2V requirement through external resistor configuration. This part operates at reduced output current (1A vs. 1.8A) and uses surface-mount packaging (TO-263 DDPAK-5), requiring circuit redesign for mechanical and thermal integration.

Substitution feasibility depends on:

Output voltage compatibility (fixed -5.2V vs. adjustable range)
Output current requirement (1.8A vs. 1A)
Mounting technology (through-hole vs. surface-mount)
Thermal dissipation capability in target application

Parameter Comparison

Parameter	LM2990T-5.2	LM2990T-5.2/NOPB	LM2991SX/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Configuration	Negative	Negative	Negative
Output Type	Fixed	Fixed	Adjustable
Output Voltage	-5.2V	-5.2V	-3V to -24V
Output Current	1.8A	1.8A	1A
Input Voltage (Max)	-26V	-26V	-26V
Voltage Dropout (Max)	1V @ 1A	1V @ 1A	1V @ 1A
Quiescent Current	1 mA	1 mA	0.7 mA
PSRR	58dB (1kHz)	58dB (1kHz)	60dB (1kHz)
Protection Features	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Temperature, Short Circuit
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package / Case	TO-220-3	TO-220-3	TO-263 (DDPAK-5)
Mounting Type	Through Hole	Through Hole	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LM2990T-5.2/NOPB is the primary substitute for direct replacement applications. This part is electrically and mechanically identical to the original LM2990T-5.2, with the advantage of active product status and ROHS3 compliance. No circuit modifications are required. This option is recommended for designs requiring immediate obsolescence mitigation with minimal engineering effort.

LM2991SX/NOPB serves as a functional alternative for applications where output current requirements can be reduced to 1A and surface-mount packaging is acceptable. The adjustable output range requires external resistor network configuration to establish -5.2V output. This part offers improved quiescent current performance (0.7 mA vs. 1 mA) and higher PSRR (60dB vs. 58dB). Circuit redesign and PCB layout modification are necessary for implementation.

Selection between these options depends on production constraints, thermal requirements, and mechanical integration feasibility within the target application.

Frequently Asked Questions (FAQ)

Q: Can LM2990T-5.2/NOPB be used as a direct replacement for LM2990T-5.2?

A: Yes. LM2990T-5.2/NOPB is electrically and mechanically identical. Both parts deliver -5.2V at 1.8A in TO-220-3 packaging. The primary difference is product status (active vs. obsolete) and RoHS compliance certification. No design changes are required.

Q: What are the limitations of using LM2991SX/NOPB as a substitute?

A: LM2991SX/NOPB has two key limitations: (1) Output current is reduced to 1A, requiring verification that the application does not exceed this threshold; (2) Output voltage is adjustable rather than fixed, necessitating external resistor configuration to set -5.2V output. Additionally, the part uses surface-mount TO-263 packaging instead of through-hole TO-220-3, requiring PCB redesign.

Q: Are all three parts pin-compatible?

A: No. LM2990T-5.2 and LM2990T-5.2/NOPB share identical pinouts in TO-220-3 packaging. LM2991SX/NOPB uses TO-263 (DDPAK-5) packaging with a different pin configuration and pin count, making it incompatible for direct socket replacement.

Q: What compliance certifications apply to each part?

A: LM2990T-5.2 is RoHS non-compliant. LM2990T-5.2/NOPB and LM2991SX/NOPB are both ROHS3 compliant. All three parts are REACH unaffected and classified under ECCN EAR99.

Q: Which substitute is recommended for new designs?

A: LM2990T-5.2/NOPB is recommended for new designs requiring -5.2V fixed output at 1.8A in through-hole packaging. This part maintains full electrical compatibility while offering active product status and modern compliance certifications.

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