MMSZ5228B Zener Diode 3.9V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The MMSZ5228B is a 3.9 V Zener diode rated for 500 mW power dissipation in a surface mount SOD-123 package, manufactured by onsemi. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MMSZ5228B serves voltage regulation and protection applications requiring precise 3.9 V reference voltage with ±5% tolerance across the operating temperature range of -55°C to 150°C.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.9	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	23	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	SOD-123

Substitute Part Grouping Explanation

Substitution of the MMSZ5228B is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 3.9 V nominal
Tolerance: ±5%
Power rating: 500 mW
Package: SOD-123 surface mount
Operating temperature range: -55°C to 150°C minimum

Secondary Compatibility Factors:

Impedance (Zzt): Maximum 23 Ohms for direct equivalence; up to 90 Ohms for functional alternatives
Reverse leakage current: 10 µA @ 1 V for direct equivalence; 3-5 µA @ 1-2 V for functional alternatives
Forward voltage: 900 mV @ 10 mA (consistent across all substitutes)

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents (onsemi): Parts with identical electrical specifications and packaging, differing only in product status (Active vs. Obsolete) or packaging format (Cut Tape vs. Tape & Reel).

Parametric Equivalents (onsemi Automotive Grade): Parts meeting all electrical specifications with automotive qualification (AEC-Q101) and extended temperature range support.

Cross-Manufacturer Alternatives: Parts from Micro Commercial Co and Diodes Incorporated meeting core electrical specifications with variations in impedance, leakage current, or temperature range.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance (%)	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA)	Temp Range (°C)	Status	Packaging
MMSZ5228B	onsemi	3.9	±5	500	23	10 @ 1V	-55 to 150	Obsolete	Cut Tape
MMSZ3V9T1G	onsemi	3.9	±5	500	90	3 @ 1V	-55 to 150	Active	Cut Tape & Digi-Reel
MMSZ4686T1G	onsemi	3.9	±5	500	Not specified	5 @ 2V	-55 to 150	Active	Cut Tape & Digi-Reel
MMSZ5228BT1G	onsemi	3.9	±5	500	23	10 @ 1V	-55 to 150	Active	Tape & Reel
SZMMSZ3V9T1G	onsemi	3.9	±5	500	90	3 @ 1V	-55 to 150	Active	Cut Tape & Digi-Reel
SZMMSZ4686T1G	onsemi	3.9	±5	500	Not specified	5 @ 2V	-55 to 150	Active	Tape & Reel
SZMMSZ5228BT1G	onsemi	3.9	±5	500	23	10 @ 1V	-55 to 150	Active	Tape & Reel
MMSZ5228B-TP	Micro Commercial Co	3.9	±5	500	23	10 @ 1V	-55 to 150	Active	Tape & Reel
MMSZ5228B-7-F	Diodes Incorporated	3.9	±5	500	23	10 @ 1V	-65 to 150	Active	Cut Tape & Digi-Reel
BZT52C3V9-7-F	Diodes Incorporated	3.9	±5	500	90	3 @ 1V	-65 to 150	Active	Tape & Reel
BZT52C3V9-13-F	Diodes Incorporated	3.9	±5.13	370	90	3 @ 1V	-65 to 150	Active	Tape & Reel

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

MMSZ5228BT1G (onsemi) is the primary direct equivalent, offering identical electrical specifications to the obsolete MMSZ5228B with Active product status. This part maintains the 23 Ohm impedance and 10 µA reverse leakage specification, differing only in packaging format (Tape & Reel vs. Cut Tape). Selection of this part eliminates obsolescence risk while preserving circuit performance.

MMSZ5228B-TP (Micro Commercial Co) provides an alternative direct equivalent with identical electrical parameters and Active status. This cross-manufacturer option is suitable when onsemi supply is constrained.

MMSZ5228B-7-F (Diodes Incorporated) offers identical electrical specifications with extended lower temperature range (-65°C vs. -55°C) and Active status. This part is suitable for applications requiring enhanced low-temperature performance.

For Automotive Applications:

SZMMSZ5228BT1G (onsemi) is the automotive-grade equivalent with AEC-Q101 qualification, maintaining identical electrical specifications to the original part. This selection is mandatory for automotive applications requiring compliance with AEC-Q101 standards.

SZMMSZ3V9T1G and SZMMSZ4686T1G (onsemi) are automotive-qualified alternatives with higher impedance (90 Ohms) and lower reverse leakage (3-5 µA), suitable for automotive designs where these parameter variations are acceptable.

For Functional Alternatives (Higher Impedance):

MMSZ3V9T1G (onsemi) and BZT52C3V9-7-F (Diodes Incorporated) provide 90 Ohm impedance with reduced reverse leakage (3 µA). These parts are functionally compatible when circuit design tolerates higher impedance and lower leakage specifications.

For Power-Constrained Applications:

BZT52C3V9-13-F (Diodes Incorporated) is a similar part with reduced power rating (370 mW vs. 500 mW). This part is suitable only for applications where 370 mW power dissipation is sufficient and lower power consumption is beneficial.

All recommended substitutes maintain RoHS3 compliance, REACH Unaffected status, and SOD-123 surface mount packaging. Selection should prioritize Active product status to ensure long-term supply availability.

Frequently Asked Questions (FAQ)

Q: Can MMSZ3V9T1G replace MMSZ5228B directly in all applications?

A: MMSZ3V9T1G meets the core electrical specifications (3.9 V, 500 mW, ±5% tolerance) and operating temperature range. However, it specifies 90 Ohm impedance versus 23 Ohms for the original part, and 3 µA reverse leakage versus 10 µA. These differences are acceptable in most voltage regulation and protection circuits, but circuit-specific validation is required for applications with tight impedance or leakage requirements.

Q: What is the difference between MMSZ5228BT1G and MMSZ3V9T1G?

A: Both are onsemi Active products with identical 3.9 V, 500 mW specifications. MMSZ5228BT1G maintains the original 23 Ohm impedance and 10 µA leakage, while MMSZ3V9T1G specifies 90 Ohm impedance and 3 µA leakage. MMSZ5228BT1G is the direct electrical equivalent; MMSZ3V9T1G is a functional alternative with different impedance characteristics.

Q: Are automotive-grade parts (SZMMSZ series) required for non-automotive applications?

A: Automotive-grade parts are not required for non-automotive applications. The SZMMSZ series includes AEC-Q101 qualification and automotive-specific testing. For general industrial or consumer applications, standard onsemi parts (MMSZ series) or cross-manufacturer alternatives are appropriate.

Q: Can BZT52C3V9-13-F be used as a substitute for MMSZ5228B?

A: BZT52C3V9-13-F is a similar part with the same 3.9 V zener voltage but reduced power rating (370 mW vs. 500 mW). This part is suitable only for applications where maximum power dissipation does not exceed 370 mW. Circuits designed for 500 mW operation cannot use this part without thermal redesign.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in two packaging formats: Cut Tape & Digi-Reel (CT) for lower-volume applications and Tape & Reel (TR) for high-volume production. Both formats use the same SOD-123 component package. Selection depends on procurement volume and assembly equipment compatibility.

Q: Does MMSZ5228B-7-F from Diodes Incorporated offer any advantages over onsemi alternatives?

A: MMSZ5228B-7-F maintains identical electrical specifications to the original MMSZ5228B and extends the lower operating temperature to -65°C (versus -55°C). This extended temperature range is beneficial for applications operating in extreme cold environments. The part is available in higher inventory quantities (137,300 pcs) compared to other alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are RoHS3 compliant and REACH Unaffected. The original MMSZ5228B does not specify RoHS status, but all Active alternatives meet current environmental compliance requirements.

Q: What is the significance of the impedance (Zzt) parameter in substitution?

A: Impedance affects the dynamic response of the zener diode under transient load conditions. Lower impedance (23 Ohms) provides faster voltage regulation response, while higher impedance (90 Ohms) results in slower response. For precision voltage reference applications, 23 Ohm impedance is preferred. For general protection circuits, 90 Ohm impedance is acceptable.

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