LP2951-03BN Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2951-03BN is a linear voltage regulator IC from Microchip Technology designed for positive adjustable (fixed) output applications with 100mA current capability in an 8-DIP package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The LP2951 series provides regulated output voltage from 1.24V to 29V with integrated enable and error flag control features. The 8-DIP through-hole package accommodates legacy and new designs requiring this form factor.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Number of Regulators	1
Voltage - Input (Max)	30V
Voltage - Output (Min/Fixed)	1.24V (5V)
Voltage - Output (Max)	29V
Current - Output	100mA
Voltage Dropout (Max)	0.6V @ 100mA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)

Substitute Part Grouping Explanation

Substitution for the LP2951-03BN is determined by the following critical parameters:

Output voltage range: 1.24V to 29V adjustable (fixed) capability
Output current: 100mA minimum
Voltage dropout: 0.6V @ 100mA maximum
Package form factor: 8-DIP through-hole
Operating temperature range: -40°C to 125°C
Control features: Enable and Error Flag functionality
Quiescent current: 150µA nominal

Parts meeting these electrical and mechanical specifications are classified as direct substitutes. Variations in RoHS compliance status, moisture sensitivity level, or product status (active vs. obsolete) do not affect functional equivalence but may impact procurement and regulatory requirements.

Parameter Comparison

Parameter	LP2951-03BN (Main)	LP2951-03YN	LP2951ACN/NOPB	LP2951-02YN
Manufacturer	Microchip Technology	Microchip Technology	Texas Instruments	Microchip Technology
Product Status	Obsolete	Active	Active	Active
Output Configuration	Positive	Positive	Positive	Positive
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)
Voltage - Input (Max)	30V	30V	30V	30V
Voltage - Output (Min/Fixed)	1.24V (5V)	1.24V (5V)	1.235V (5V)	1.24V (5V)
Voltage - Output (Max)	29V	29V	29V	29V
Current - Output	100mA	100mA	100mA	100mA
Voltage Dropout (Max)	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Current - Quiescent (Iq)	150µA	150µA	120µA	150µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

LP2951-03YN is the primary direct substitute for LP2951-03BN. Both parts are manufactured by Microchip Technology with identical electrical specifications and package configuration. The LP2951-03YN carries active product status and ROHS3 compliance, addressing the obsolescence and regulatory concerns of the original part.

LP2951ACN/NOPB from Texas Instruments is a manufacturer-recommended equivalent with active product status and ROHS3 compliance. This part exhibits lower quiescent current (120µA vs. 150µA) and includes additional protection features (Over Current, Over Temperature, Short Circuit). The output voltage minimum specification differs slightly (1.235V vs. 1.24V), which remains within acceptable tolerance for most applications.

LP2951-02YN from Microchip Technology is a parametric equivalent with identical electrical performance to the main part. This option carries ROHS3 compliance and active product status. The moisture sensitivity level is rated MSL 3 (168 Hours), requiring controlled storage and handling compared to MSL 1 parts.

Frequently Asked Questions (FAQ)

Q: Can LP2951-03YN directly replace LP2951-03BN without circuit modification?

A: Yes. Both parts share identical electrical specifications, control features, and 8-DIP package pinout. No circuit modification is required for functional substitution.

Q: What is the difference between LP2951-03YN and LP2951-02YN?

A: Both parts are Microchip Technology products with identical electrical parameters and control features. The primary difference is moisture sensitivity level: LP2951-03YN is MSL 1 (unlimited shelf life), while LP2951-02YN is MSL 3 (168-hour storage limit under controlled conditions). Selection depends on storage and handling capabilities.

Q: Why does LP2951ACN/NOPB show lower quiescent current?

A: The Texas Instruments LP2951ACN/NOPB specifies 120µA quiescent current compared to 150µA for Microchip variants. This represents a design difference between manufacturers and does not affect substitution compatibility. Lower quiescent current may provide marginal power consumption benefits in battery-powered applications.

Q: Are all substitute parts ROHS3 compliant?

A: LP2951-03YN and LP2951ACN/NOPB are ROHS3 compliant. LP2951-02YN is also ROHS3 compliant. The original LP2951-03BN is RoHS non-compliant. For applications requiring RoHS compliance, any of the three substitute parts are suitable.

Q: What packaging options are available for these substitutes?

A: All substitute parts are supplied in 8-DIP through-hole package (0.300", 7.62mm). LP2951-03YN and LP2951ACN/NOPB are packaged in tubes. LP2951-02YN is also tube-packaged. No surface-mount alternatives are provided in this substitute group.

Q: Can I use LP2951ACN/NOPB in a design originally specified for LP2951-03BN?

A: Yes. The LP2951ACN/NOPB meets all critical electrical and mechanical requirements. The additional protection features (Over Current, Over Temperature, Short Circuit) provide enhanced reliability. The slight variation in output voltage minimum (1.235V vs. 1.24V) is negligible for standard applications.

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