LP2951-02BN Equivalent & Substitute Parts

Part Overview

The LP2951-02BN is a linear voltage regulator IC from Microchip Technology designed for positive adjustable (fixed) output applications with 100mA current capability in an 8-PDIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The LP2951 series provides adjustable output voltage regulation with integrated enable and error flag control features, suitable for applications requiring low-dropout linear regulation across a 1.24V to 29V output range.

Substiute Parts

LP2951-02BN

Microchip TechnologyIn Stock: 2498LP2951-02BN Datasheet

Current PartRFQ

LP2951-02YN

Microchip TechnologyIn Stock: 849LP2951-02YN Datasheet

DirectRFQ

LP2951-02YN

Microchip TechnologyIn Stock: 849LP2951-02YN Datasheet

DirectRFQ

LP2951ACN/NOPB

Texas InstrumentsIn Stock: 949LP2951ACN/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP2951-02BN is determined by strict equivalence across the following critical parameters:

• Output Configuration: Positive
• Output Type: Adjustable (Fixed)
• Number of Regulators: 1
• Voltage - Input (Max): 30V
• Voltage - Output Range: 1.24V to 29V
• Current - Output: 100mA
• Voltage Dropout (Max): 0.6V @ 100mA
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Supplier Device Package: 8-PDIP

Substitute parts must maintain identical electrical specifications and physical package compatibility to ensure direct replacement capability without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

Both LP2951-02YN and LP2951ACN/NOPB are functionally equivalent substitutes for the obsolete LP2951-02BN based on electrical and mechanical parameter equivalence.

LP2951-02YN (Microchip Technology) maintains the same manufacturer lineage as the original part and is currently in active production status. This part achieves ROHS3 compliance and is available in tube packaging. The quiescent current specification remains identical at 150 µA.

LP2951ACN/NOPB (Texas Instruments) is an alternative from a different manufacturer, also in active production status with ROHS3 compliance. This part offers enhanced protection features including over-current, over-temperature, and short-circuit protection. The quiescent current is slightly lower at 120 µA, and moisture sensitivity is rated at MSL 1 (Unlimited), matching the original part specification.

Selection between these substitutes depends on procurement availability, supply chain preferences, and whether the additional protection features of the Texas Instruments variant are required for the application.

Frequently Asked Questions (FAQ)

Q: Can LP2951-02YN directly replace LP2951-02BN without circuit modification?

A: Yes. The LP2951-02YN maintains identical electrical specifications and 8-PDIP package compatibility, enabling direct pin-for-pin replacement without circuit redesign.

Q: What is the difference between LP2951-02YN and LP2951ACN/NOPB?

A: Both are functionally equivalent substitutes with identical output voltage range, current rating, and dropout voltage. The LP2951ACN/NOPB includes additional protection features (over-current, over-temperature, short-circuit) and has a slightly lower quiescent current (120 µA vs. 150 µA). The LP2951-02YN maintains the original quiescent current specification.

Q: Are there packaging differences between the substitute parts?

A: Both substitute parts use 8-PDIP through-hole packaging identical to the original LP2951-02BN. The LP2951-02YN is supplied in tube packaging, while packaging details for LP2951ACN/NOPB are specified as tube. Pin configuration and mechanical dimensions are equivalent across all three parts.

Q: Does the RoHS compliance status affect substitution?

A: The original LP2951-02BN is RoHS non-compliant, while both substitutes (LP2951-02YN and LP2951ACN/NOPB) are ROHS3 compliant. For applications subject to RoHS regulations, the compliant substitutes are required. For legacy systems without RoHS requirements, either substitute remains functionally compatible.

Q: What is the significance of the MSL (Moisture Sensitivity Level) difference?

A: The LP2951-02BN and LP2951ACN/NOPB both specify MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The LP2951-02YN specifies MSL 3 (168 Hours), requiring controlled storage and handling conditions. For applications with extended storage or high-humidity environments, MSL 1 rated parts may be preferred.

Q: Are the control features identical across all three parts?

A: The LP2951-02BN and LP2951-02YN both include Enable and Error Flag control features. The LP2951ACN/NOPB includes Enable control but does not specify an Error Flag output. Applications requiring error flag functionality should use LP2951-02YN for direct feature compatibility.