MP8903DJ-2.85-LF-Z Equivalent & Substitute Parts

Part Overview

The MP8903DJ-2.85-LF-Z is a linear voltage regulator IC from Monolithic Power Systems Inc., classified as a Power Management (PMIC) component. This device functions as a positive adjustable (fixed) output regulator with 150mA output current capability in a TSOT-23-5 surface mount package. The part is designated as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support existing production requirements.

Key Parameters

Parameter	Value
Manufacturer	Monolithic Power Systems Inc.
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Number of Regulators	1
Voltage - Input (Max)	6.5V
Voltage - Output (Min/Fixed)	1.25V (2.85V)
Voltage - Output (Max)	5V
Voltage Dropout (Max)	0.125V @ 150mA
Current - Output	150mA
Control Features	Enable
Protection Features	Over Temperature
Operating Temperature	-40°C ~ 85°C
Package / Case	SOT-23-5 Thin, TSOT-23-5
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MP8903DJ-2.85-LF-Z are identified based on strict parametric equivalence within the allowed electrical and mechanical specifications for linear voltage regulators. The substitution criteria are:

Output configuration: Positive
Output type: Adjustable (Fixed)
Number of regulators: 1
Voltage - Input (Max): 6.5V
Voltage - Output (Min/Fixed): 1.25V (2.85V)
Voltage - Output (Max): 5V
Voltage Dropout (Max): 0.125V @ 150mA
Current - Output: 150mA
Control Features: Enable
Protection Features: Over Temperature
Operating Temperature: -40°C ~ 85°C
Package / Case: SOT-23-5 Thin, TSOT-23-5
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

The identified substitutes are MP8801DJ-2.85-LF-Z and MP8801DJ-2.85-LF-P, both from Monolithic Power Systems Inc. These parts maintain identical electrical performance specifications and package compatibility with the main part number.

Parameter Comparison

Parameter	MP8903DJ-2.85-LF-Z (Main)	MP8801DJ-2.85-LF-Z (Substitute)	MP8801DJ-2.85-LF-P (Substitute)
Manufacturer	Monolithic Power Systems Inc.	Monolithic Power Systems Inc.	Monolithic Power Systems Inc.
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable (Fixed)	Adjustable (Fixed)	Adjustable (Fixed)
Number of Regulators	1	1	1
Voltage - Input (Max)	6.5V	6.5V	6.5V
Voltage - Output (Min/Fixed)	1.25V (2.85V)	1.25V (2.85V)	1.25V (2.85V)
Voltage - Output (Max)	5V	5V	5V
Voltage Dropout (Max)	0.125V @ 150mA	0.125V @ 150mA (Typ)	0.125V @ 150mA (Typ)
Current - Output	150mA	150mA	150mA
Control Features	Enable	Enable	Enable
Protection Features	Over Temperature	Over Temperature	Over Temperature
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Not For New Designs	Active	Active

Engineering Selection Recommendations

Both MP8801DJ-2.85-LF-Z and MP8801DJ-2.85-LF-P are direct parametric equivalents to the MP8903DJ-2.85-LF-Z. The primary distinction between the substitute options is product status and packaging designation:

MP8801DJ-2.85-LF-Z is designated as Active, indicating ongoing manufacturer support and availability. This part carries the -LF-Z packaging designation and maintains full compliance with ROHS3 and REACH requirements.

MP8801DJ-2.85-LF-P is also designated as Active and carries the -LF-P packaging designation, maintaining identical electrical specifications and compliance certifications.

Both substitutes provide superior PSRR performance (70dB ~ 30dB at 1kHz ~ 1MHz) compared to the main part (50dB ~ 20dB), and both specify quiescent current (Iq) at 150 µA. These characteristics ensure functional compatibility and support long-term supply chain continuity for applications currently using the MP8903DJ-2.85-LF-Z.

Frequently Asked Questions (FAQ)

Q: Can MP8801DJ-2.85-LF-Z and MP8801DJ-2.85-LF-P be used interchangeably with MP8903DJ-2.85-LF-Z?

A: Yes. Both substitute parts maintain identical electrical specifications, output voltage configuration, current ratings, thermal operating range, and package form factor. The primary difference is product status; the MP8801 series is Active, while the MP8903DJ-2.85-LF-Z is Not For New Designs.

Q: What is the difference between MP8801DJ-2.85-LF-Z and MP8801DJ-2.85-LF-P?

A: Both parts are parametrically equivalent. The difference lies in the packaging designation suffix (-LF-Z versus -LF-P). Consult packaging specifications for lead finish and tape reel configuration details specific to your procurement requirements.

Q: Are there any performance differences between the main part and substitutes?

A: The substitute parts (MP8801 series) demonstrate improved PSRR performance and explicitly specify quiescent current characteristics. All other electrical parameters remain equivalent within the specified tolerances.

Q: Is the SOT-23-5 package footprint identical across all three parts?

A: Yes. All three parts use the SOT-23-5 Thin (TSOT-23-5) package, ensuring PCB layout and assembly compatibility without design modification.

Q: Do the substitute parts maintain the same compliance certifications?

A: Yes. Both MP8801DJ-2.85-LF-Z and MP8801DJ-2.85-LF-P are ROHS3 Compliant, REACH Unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the main part's compliance profile.

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