LP2953IN/NOPB Equivalent & Substitute Parts

Part Overview

The LP2953IN/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications with 250mA current capability in a 16-DIP through-hole package. This device provides regulated power management with integrated protection features including over-current, over-temperature, and reverse polarity protection.

The LP2953IN/NOPB is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance or redesigns requiring compatible alternatives.

Substiute Parts

LP2953IN/NOPB

Texas InstrumentsIn Stock: 1158LP2953IN/NOPB Datasheet

Current PartRFQ

LP2953IM/NOPB

National SemiconductorIn Stock: 1088LP2953IM/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP2953IN/NOPB is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Output configuration (Positive)
• Output type (Adjustable/Fixed)
• Number of regulators (1)
• Voltage input maximum (30V)
• Voltage output range (1.23V to 29V)
• Voltage dropout specification (0.8V @ 250mA)
• Output current rating (250mA)
• Quiescent current (170 µA)
• Control features (Enable function)
• Protection features (Over Current, Over Temperature, Reverse Polarity)
• Operating temperature range (-40°C ~ 125°C)

Mechanical Compatibility Criteria:

• Mounting type (Through Hole vs. Surface Mount)
• Package type (16-DIP vs. alternative packages)
• Pin configuration and footprint

The LP2953IM/NOPB qualifies as a manufacturer-recommended substitute based on identical electrical specifications. The primary difference is the package format: the substitute uses 16-SOIC surface-mount packaging instead of 16-DIP through-hole packaging, requiring PCB redesign for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

The LP2953IM/NOPB is the manufacturer-recommended substitute for the obsolete LP2953IN/NOPB. Both parts maintain identical electrical specifications across all critical parameters: voltage ratings, current capacity, dropout voltage, quiescent current, control features, and protection mechanisms.

Selection Basis:

The LP2953IM/NOPB is active in production, ensuring long-term availability and supply chain continuity compared to the obsolete LP2953IN/NOPB. Both parts are ROHS3 compliant, supporting regulatory requirements for new designs and legacy system support.

Implementation Consideration:

Direct pin-for-pin substitution is not possible due to package format differences. The LP2953IN/NOPB uses through-hole 16-DIP packaging suitable for breadboard and legacy PCB designs, while the LP2953IM/NOPB uses surface-mount 16-SOIC packaging. PCB redesign is required to accommodate the different footprint and mounting method.

Frequently Asked Questions (FAQ)

Q: Can the LP2953IM/NOPB replace the LP2953IN/NOPB without PCB modification?

A: No. While the electrical specifications are identical, the packages differ fundamentally. The LP2953IN/NOPB is a through-hole 16-DIP component, and the LP2953IM/NOPB is a surface-mount 16-SOIC component. PCB redesign is required to accommodate the different footprint, pad layout, and mounting method.

Q: Are the electrical characteristics identical between these parts?

A: Yes. Both parts share identical specifications for voltage input/output ranges, current ratings, dropout voltage, quiescent current, control features, protection mechanisms, and operating temperature range. The functional behavior in circuit operation is equivalent.

Q: Why is the LP2953IN/NOPB classified as obsolete?

A: The LP2953IN/NOPB is no longer in active production. The LP2953IM/NOPB represents the active production alternative, reflecting the industry shift toward surface-mount technology for power management ICs.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution eligibility is determined by: output configuration (Positive), output type (Adjustable/Fixed), voltage ratings (30V input max, 1.23V-29V output), current capacity (250mA), dropout voltage (0.8V @ 250mA), quiescent current (170 µA), control features (Enable), protection features (Over Current, Over Temperature, Reverse Polarity), and operating temperature range (-40°C ~ 125°C).

Q: Is the LP2953IM/NOPB RoHS compliant?

A: RoHS compliance information for the LP2953IM/NOPB is not specified in the provided data. Verify RoHS status with the manufacturer or authorized distributor before final component selection for applications requiring regulatory compliance.

Q: Can I use a through-hole adapter or socket to mount the LP2953IM/NOPB in place of the LP2953IN/NOPB?

A: Adapter solutions may be available, but they introduce additional cost, assembly complexity, and potential reliability concerns. Direct PCB redesign to accommodate the 16-SOIC footprint is the standard engineering approach for component substitution.