MP8903DJ-3.3-LF-Z Equivalent & Substitute Parts

Part Overview

The MP8903DJ-3.3-LF-Z is a linear voltage regulator IC from Monolithic Power Systems Inc., classified as a Power Management (PMIC) component. It provides positive adjustable (fixed) output regulation at 3.3V with 150mA output current in a surface-mount SOT-23-5 package. The device is currently marked as "Not For New Designs," making identification of active equivalent alternatives essential for ongoing production and design continuity.

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 (Fixed)	3.3V
Voltage - Output (Max)	5V
Current - Output	150mA
Voltage Dropout (Max)	0.125V @ 150mA
Package / Case	SOT-23-5 Thin, TSOT-23-5
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MP8903DJ-3.3-LF-Z is determined by the following critical parameters:

Output voltage regulation: 3.3V fixed output
Output current capability: 150mA minimum
Package type: SOT-23-5 surface mount
Input voltage range: Maximum 6.5V
Dropout voltage: 0.125V @ 150mA or better
Environmental compliance: ROHS3 Compliant, operating range -40°C to 85°C

The MP8801DJ series represents the active production equivalent to the MP8903DJ series. Both series share identical electrical specifications and packaging, with the MP8801DJ offering improved product status (Active vs. Not For New Designs) and enhanced performance characteristics in certain parameters.

Parameter Comparison

Parameter	MP8903DJ-3.3-LF-Z	MP8903DJ-3.3-LF-P	MP8801DJ-3.3-LF-Z	MP8801DJ-3.3-LF-P
Manufacturer	Monolithic Power Systems Inc.	Monolithic Power Systems Inc.	Monolithic Power Systems Inc.	Monolithic Power Systems Inc.
Product Status	Not For New Designs	Not For New Designs	Active	Active
Packaging	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Voltage - Input (Max)	6.5V	6.5V	6.5V	6.5V
Voltage - Output (Fixed)	3.3V	3.3V	3.3V	3.3V
Voltage - Output (Max)	5V	5V	5V	5V
Current - Output	150mA	150mA	150mA	150mA
Voltage Dropout (Max)	0.125V @ 150mA	0.125V @ 150mA	0.125V @ 150mA (Typ)	0.125V @ 150mA (Typ)
Current - Quiescent (Iq)	Not specified	Not specified	150 µA	150 µA
PSRR	50dB ~ 20dB (1kHz ~ 1MHz)	50dB ~ 20dB (1kHz ~ 1MHz)	70dB ~ 30dB (1kHz ~ 1MHz)	70dB ~ 30dB (1kHz ~ 1MHz)
Package / Case	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	32,100 Pcs	910 Pcs	32,100 Pcs	2,400 Pcs

Engineering Selection Recommendations

For applications currently using MP8903DJ-3.3-LF-Z, the MP8801DJ-3.3-LF-Z is the primary recommended substitute. Both parts maintain identical electrical specifications and package compatibility. The MP8801DJ series carries Active product status, ensuring long-term availability and support compared to the Not For New Designs status of the MP8903DJ series.

Packaging format selection between Cut Tape (CT) & Digi-Reel® (-Z suffix) and Tape & Reel (TR) (-P suffix) depends on assembly requirements. The -Z variant supports both cut tape and Digi-Reel® formats, while the -P variant is supplied in standard Tape & Reel format. Both packaging options are electrically and mechanically equivalent.

The MP8801DJ series demonstrates improved PSRR performance (70dB ~ 30dB versus 50dB ~ 20dB across the 1kHz to 1MHz range) and provides specified quiescent current (150 µA), offering enhanced noise rejection characteristics for noise-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can MP8801DJ-3.3-LF-Z directly replace MP8903DJ-3.3-LF-Z on existing PCBs?

A: Yes. Both parts use identical SOT-23-5 surface-mount packaging with matching pinout, electrical specifications, and operating parameters. No PCB modifications are required.

Q: What is the difference between the -Z and -P packaging suffixes?

A: The -Z suffix indicates Cut Tape (CT) & Digi-Reel® packaging format, while -P indicates standard Tape & Reel (TR) format. Both are electrically identical; selection depends on assembly line equipment compatibility.

Q: Why is MP8903DJ marked "Not For New Designs"?

A: This designation indicates the part is in mature or end-of-life status. Monolithic Power Systems recommends using the MP8801DJ series for new designs to ensure long-term supply continuity and access to product support.

Q: Are there performance differences between MP8903DJ and MP8801DJ?

A: The MP8801DJ series provides improved PSRR performance and specifies quiescent current characteristics. Core output regulation, dropout voltage, and current capacity remain equivalent across both series.

Q: What inventory considerations apply to these substitutes?

A: MP8801DJ-3.3-LF-Z maintains the highest inventory level (32,100 Pcs), followed by MP8801DJ-3.3-LF-P (2,400 Pcs). MP8903DJ variants show lower availability, with MP8903DJ-3.3-LF-P at 910 Pcs. For production continuity, MP8801DJ-3.3-LF-Z is the preferred choice.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All listed parts are ROHS3 Compliant, REACH Unaffected, and carry identical environmental and regulatory certifications (ECCN: EAR99, HTSUS: 8542.39.0001, MSL: 1).

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