LP2951-02BM Equivalent & Substitute Parts

Part Overview

The LP2951-02BM is a linear voltage regulator IC from Microchip Technology designed for positive adjustable (fixed) output applications with 100mA current capability in an 8-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The LP2951 series provides Enable and Error Flag control features suitable for applications requiring regulated power management in compact form factors.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Part Number	LP2951-02BM
Category	Power Management (PMIC)
Package Type	8-SOIC (0.154", 3.90mm Width)
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Current Output	100mA
Voltage Input (Max)	30V
Voltage Output (Min/Fixed)	1.24V (5V)
Voltage Output (Max)	29V
Voltage Dropout (Max)	0.6V @ 100mA
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Control Features	Enable, Error Flag
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitute parts for the LP2951-02BM are grouped based on the following critical parameters that determine functional compatibility:

Core Substitution Criteria:

Output Configuration: Positive
Output Type: Adjustable (Fixed)
Current Output: 100mA
Package Type: 8-SOIC (0.154", 3.90mm Width)
Voltage Input (Max): 30V
Voltage Output Range: 1.24V–29V minimum
Operating Temperature: -40°C ~ 125°C
Mounting Type: Surface Mount

Substitution Categories:

Direct Manufacturer Equivalent (Microchip Technology): LP2951-02YM and LP2951-03YM maintain identical electrical specifications and packaging. These parts differ only in product status (Active vs. Discontinued) and RoHS compliance level.

Cross-Manufacturer Alternatives (onsemi and Texas Instruments): LP2951ACDR2G (onsemi), LP2951ACM/NOPB, LP2951ACMX/NOPB, LP2951CM/NOPB, and LP2951CMX/NOPB (Texas Instruments) share the same base product number (LP2951) and package configuration. These alternatives exhibit minor variations in quiescent current (120 µA vs. 150 µA), voltage dropout characteristics (0.45V–0.6V @ 100mA), and protection features, but remain functionally compatible within the specified parameter ranges.

Parameter Comparison

Parameter	LP2951-02BM (Main)	LP2951-02YM	LP2951-03YM	LP2951ACDR2G	LP2951ACM/NOPB	LP2951ACMX/NOPB	LP2951CM/NOPB	LP2951CMX/NOPB
Manufacturer	Microchip	Microchip	Microchip	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive	Positive	Positive
Current Output	100mA	100mA	100mA	100mA	100mA	100mA	100mA	100mA
Voltage Input (Max)	30V	30V	30V	30V	30V	30V	30V	30V
Voltage Output (Min/Fixed)	1.24V (5V)	1.24V (5V)	1.24V (5V)	1.235V (5V)	1.235V (5V)	1.235V (5V)	1.235V (5V)	1.235V (5V)
Voltage Output (Max)	29V	29V	29V	30V	29V	29V	29V	29V
Voltage Dropout (Max)	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.45V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Current Quiescent (Iq)	150 µA	150 µA	150 µA	120 µA	120 µA	120 µA	120 µA	120 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Packaging Format	Tube	Tube	Tube	Cut Tape & Digi-Reel	Tube	Cut Tape & Digi-Reel	Tube	Cut Tape & Digi-Reel
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Microchip Technology): LP2951-02YM and LP2951-03YM are the primary alternatives to LP2951-02BM. Both maintain identical electrical specifications and 8-SOIC packaging. LP2951-02YM is preferred as the direct equivalent with Active product status and ROHS3 compliance. LP2951-03YM provides an additional option with equivalent performance characteristics.

For Cross-Manufacturer Substitution: Texas Instruments LP2951 variants (LP2951ACM/NOPB, LP2951ACMX/NOPB, LP2951CM/NOPB, LP2951CMX/NOPB) and onsemi LP2951ACDR2G are functionally compatible alternatives. These parts maintain the same 8-SOIC package and core electrical specifications. The Texas Instruments variants offer enhanced protection features (Over Current, Over Temperature, Short Circuit) compared to the original part. The onsemi variant provides improved voltage dropout performance (0.45V @ 100mA) and lower quiescent current (120 µA).

Compliance Considerations: All substitute parts are ROHS3 compliant and REACH unaffected, addressing environmental and regulatory requirements that the discontinued LP2951-02BM does not meet.

Packaging Format Selection: Tube packaging is available from Microchip and Texas Instruments variants. Cut Tape & Digi-Reel packaging is available from onsemi and select Texas Instruments variants, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can LP2951-02YM directly replace LP2951-02BM in existing designs? A: Yes. LP2951-02YM is a direct equivalent with identical electrical specifications, package type (8-SOIC), and pin configuration. The only differences are product status (Active vs. Discontinued) and RoHS compliance level (ROHS3 vs. Non-compliant).

Q: What are the key differences between Microchip and Texas Instruments LP2951 variants? A: Microchip variants (LP2951-02YM, LP2951-03YM) maintain 150 µA quiescent current and 0.6V dropout voltage. Texas Instruments variants reduce quiescent current to 120 µA and include enhanced protection features (Over Current, Over Temperature, Short Circuit). Voltage output ranges and operating temperature specifications remain identical.

Q: Is the onsemi LP2951ACDR2G compatible with the original LP2951-02BM? A: Yes. LP2951ACDR2G shares the same 8-SOIC package and core electrical specifications. It offers improved dropout voltage (0.45V @ 100mA) and lower quiescent current (120 µA). The maximum output voltage is 30V compared to 29V in the original part, providing additional headroom.

Q: What packaging formats are available for LP2951 substitutes? A: Tube packaging is available from Microchip Technology and Texas Instruments. Cut Tape & Digi-Reel packaging is available from onsemi and Texas Instruments variants (ACMX/NOPB and CMX/NOPB), suitable for high-volume automated assembly.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts listed are ROHS3 compliant. The original LP2951-02BM is RoHS non-compliant, making substitution necessary for applications requiring environmental compliance.

Q: Can I use LP2951-03YM as a substitute for LP2951-02YM? A: Yes. Both parts are Microchip Technology products with identical electrical specifications and 8-SOIC packaging. The designation difference (02 vs. 03) does not affect functional compatibility within the specified parameter ranges.

Q: What is the difference between LP2951ACM/NOPB and LP2951ACMX/NOPB? A: Both are Texas Instruments variants with identical electrical specifications. The primary difference is packaging format: LP2951ACM/NOPB is supplied in Tube, while LP2951ACMX/NOPB is supplied in Cut Tape & Digi-Reel format for automated assembly processes.

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