LP2951ACNG Equivalent & Substitute Parts

Part Overview

The LP2951ACNG is a linear voltage regulator IC from onsemi designed for positive adjustable (fixed) output applications with 100mA current capability in an 8-DIP through-hole package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The LP2951ACNG provides regulated output voltage from 1.235V to 30V with integrated over-current and over-temperature protection, suitable for applications requiring low-dropout regulation in legacy or through-hole-based designs.

Substiute Parts

LP2951ACNG

onsemiIn Stock: 4244LP2951ACNG Datasheet

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LP2951ACDR2G

onsemiIn Stock: 45411LP2951ACDR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The LP2951ACNG can be substituted with the LP2951ACDR2G based on electrical parameter equivalence. Both devices share identical electrical specifications across all critical parameters: input voltage range (30V max), output voltage range (1.235V to 30V), dropout voltage (0.45V @ 100mA), output current (100mA), quiescent current (120 µA), and protection features (over-current and over-temperature). The primary difference is packaging: the LP2951ACNG uses through-hole 8-DIP mounting, while the LP2951ACDR2G uses surface-mount 8-SOIC. Both maintain the same operating temperature range (-40°C to 125°C) and compliance certifications (ROHS3, REACH Unaffected). The LP2951ACDR2G is classified as active product status, providing superior availability compared to the obsolete LP2951ACNG.

Parameter Comparison

Engineering Selection Recommendations

The LP2951ACDR2G is the direct electrical equivalent to the LP2951ACNG with active product status from onsemi. Selection between these parts depends on board assembly requirements. The LP2951ACNG is suitable for through-hole assembly processes and legacy board designs. The LP2951ACDR2G is appropriate for surface-mount assembly and modern PCB layouts. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating, ensuring equivalent environmental and regulatory compliance. The active status of the LP2951ACDR2G provides superior long-term availability and supply chain stability compared to the obsolete LP2951ACNG.

Frequently Asked Questions (FAQ)

Q: Can the LP2951ACDR2G directly replace the LP2951ACNG in existing designs?

A: Electrical substitution is complete; all voltage, current, and protection specifications are identical. Physical substitution requires board redesign due to package differences: LP2951ACNG uses through-hole 8-DIP mounting while LP2951ACDR2G uses surface-mount 8-SOIC. PCB layout and assembly process must be adapted accordingly.

Q: What are the key electrical parameters that define substitution compatibility?

A: Input voltage range (30V max), output voltage range (1.235V to 30V), dropout voltage (0.45V @ 100mA), output current (100mA), quiescent current (120 µA), and protection features (over-current and over-temperature) must remain constant for functional equivalence.

Q: Are there compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating. No compliance or certification differences exist.

Q: Why is the LP2951ACNG classified as obsolete?

A: The LP2951ACNG is obsolete due to manufacturing discontinuation by onsemi. The LP2951ACDR2G remains in active production and is the recommended equivalent for new designs and production continuity.

Q: What is the primary difference between these two parts?

A: The primary difference is packaging and mounting technology. The LP2951ACNG uses through-hole 8-DIP (0.300", 7.62mm), while the LP2951ACDR2G uses surface-mount 8-SOIC (0.154", 3.90mm width). All electrical specifications are identical.