MMBZ5228B-TP Equivalent & Substitute Parts

Part Overview

The MMBZ5228B-TP is a 3.9 V Zener diode rated at 350 mW, manufactured by Micro Commercial Co in SOT-23 surface mount packaging. This component is classified as Active and maintains full RoHS3 compliance. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications across consumer, industrial, and automotive electronics. Equivalent and substitute parts are identified to address inventory availability, lead time constraints, or specific manufacturing requirements while maintaining functional compatibility within defined electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	3.9	V
Tolerance	±5%	%
Power - Maximum	350	mW
Impedance (Maximum)	23	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 1 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5228B-TP is determined by strict equivalence in the following electrical parameters: nominal Zener voltage (3.9 V), voltage tolerance (±5%), and mechanical compatibility (SOT-23 surface mount package). Parts are classified into two categories:

Direct Equivalents (Upgrade Category): Parts that match all critical electrical specifications including 350 mW power rating, 23 Ohms maximum impedance, and identical forward voltage characteristics. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Alternatives (Reduced Power Rating): Parts that maintain the 3.9 V Zener voltage and ±5% tolerance but operate at reduced maximum power dissipation (225 mW or 300 mW) or feature different package geometries (SOT-323). These parts are suitable for applications where the full 350 mW rating is not required or where package constraints permit alternative form factors. Impedance values may differ (90 Ohms versus 23 Ohms), affecting dynamic response characteristics.

Critical Selection Parameters:

Zener voltage: 3.9 V (mandatory)
Voltage tolerance: ±5% (mandatory)
Package type: SOT-23-3 or SOT-323 (application-dependent)
Power rating: 350 mW (direct equivalents) or 225–300 mW (reduced-power alternatives)
Impedance: 23 Ohms (preferred) or 90 Ohms (acceptable for non-critical applications)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Reverse Leakage (µA @ 1V)	Vf Max (mV @ 10mA)	Temp Range (°C)	Package	RoHS
MMBZ5228B-TP	Micro Commercial Co	3.9	±5%	350	23	10	900	-55 to 150	SOT-23-3	ROHS3
MMBZ5228B-7-F	Diodes Incorporated	3.9	±5%	350	23	10	900	-65 to 150	SOT-23-3	ROHS3
BZX84C3V9-7-F	Diodes Incorporated	3.9	±5%	300	90	3	900	-65 to 150	SOT-23-3	ROHS3
BZX84C3V9-G3-08	Vishay General Semiconductor	3.9	±5%	300	90	3	—	-55 to 150	SOT-23-3	ROHS3
MMBZ5228BLT1G	onsemi	3.9	±5%	225	23	10	900	-65 to 150	SOT-23-3	ROHS3
MMBZ5228BW-7-F	Diodes Incorporated	3.9	±5%	200	23	10	900	-65 to 150	SOT-323	ROHS3

Engineering Selection Recommendations

MMBZ5228B-7-F (Diodes Incorporated) is the primary direct equivalent. This part maintains identical electrical specifications (350 mW, 23 Ohms impedance, 10 µA reverse leakage) and SOT-23-3 package compatibility. The extended operating temperature range (-65°C to 150°C versus -55°C to 150°C) provides additional thermal margin. Product status is Active with full RoHS3 compliance and MSL 1 rating. This part is suitable for direct substitution in all applications where the MMBZ5228B-TP is specified.

BZX84C3V9-7-F (Diodes Incorporated) and BZX84C3V9-G3-08 (Vishay) are functionally compatible alternatives with reduced power dissipation (300 mW). These parts maintain the 3.9 V Zener voltage and SOT-23-3 package but feature 90 Ohms impedance and lower reverse leakage (3 µA). Selection of these parts is appropriate for applications where 300 mW power rating is sufficient and where lower leakage current is beneficial. Both parts are Active status with RoHS3 compliance.

MMBZ5228BLT1G (onsemi) operates at 225 mW maximum power with 23 Ohms impedance and 10 µA reverse leakage, matching the original part's dynamic characteristics. This part is suitable for power-constrained applications. Extended temperature range (-65°C to 150°C) and MSL 1 rating support reliability requirements.

MMBZ5228BW-7-F (Diodes Incorporated) features a smaller SOT-323 package with 200 mW power rating. This part is selected only when PCB space constraints require the reduced form factor. The SOT-323 package is not pin-compatible with SOT-23-3 and requires PCB layout modification. This part carries AEC-Q101 automotive qualification.

All substitute parts maintain RoHS3 compliance and REACH Unaffected status, ensuring regulatory compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5228B-7-F replace MMBZ5228B-TP in all applications?

A: Yes. MMBZ5228B-7-F is a direct electrical and mechanical equivalent with identical power rating (350 mW), impedance (23 Ohms), and SOT-23-3 package. The extended temperature range (-65°C to 150°C) provides additional operational margin. No circuit modification is required.

Q: What is the difference between the 350 mW and 300 mW rated parts?

A: The 350 mW parts (MMBZ5228B-TP and MMBZ5228B-7-F) support higher continuous power dissipation. The 300 mW alternatives (BZX84C3V9-7-F and BZX84C3V9-G3-08) are suitable for applications where peak power dissipation does not exceed 300 mW. Selection depends on circuit power budget requirements.

Q: Why do BZX84C3V9 parts show 90 Ohms impedance instead of 23 Ohms?

A: Impedance is a device characteristic determined by semiconductor design and manufacturing process. The BZX84 series exhibits higher impedance (90 Ohms) compared to the MMBZ5228 series (23 Ohms). Higher impedance results in slower transient response but lower reverse leakage current (3 µA versus 10 µA). Selection depends on circuit requirements for dynamic response and leakage characteristics.

Q: Is MMBZ5228BW-7-F compatible with existing PCB layouts?

A: No. MMBZ5228BW-7-F uses SOT-323 package, which has different pin spacing and footprint compared to the SOT-23-3 package of the original part. PCB layout and footprint modification is required. This part is selected only when space constraints necessitate the smaller package.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the original MMBZ5228B-TP.

Q: What is the significance of MSL 1 rating on substitute parts?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture bake-out requirements. All substitute parts carry MSL 1 rating, ensuring standard storage and handling procedures are sufficient.

Q: Can MMBZ5228BLT1G be used in high-power applications?

A: MMBZ5228BLT1G is rated at 225 mW maximum power dissipation, which is lower than the original 350 mW specification. This part is suitable for applications where continuous power dissipation does not exceed 225 mW. For applications requiring the full 350 mW rating, MMBZ5228B-7-F is the appropriate selection.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) and Digi-Reel packaging provide smaller quantities on cut tape segments. Both packaging formats contain identical components; selection depends on procurement volume and assembly equipment compatibility.

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