MMSZ4686 Equivalent & Substitute Parts

Part Overview

The MMSZ4686 is a Zener diode rated at 3.9 V nominal with 500 mW power dissipation in a surface mount SOD-123 package. This part is classified as obsolete, though 3500 pieces remain in stock as new original inventory. The obsolete status necessitates identification of active equivalent and substitute components to ensure design continuity and supply chain reliability for applications requiring 3.9 V Zener regulation in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.9	V
Tolerance	±5	%
Power - Max	500	mW
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	mV @ mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	SOD-123
Current - Reverse Leakage @ Vr	5 µA @ 2 V	µA @ V

Substitute Part Grouping Explanation

Substitution eligibility for the MMSZ4686 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 3.9 V
Power - Max: 500 mW
Package / Case: SOD-123
Mounting Type: Surface Mount
Tolerance: ±5%
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA
Operating Temperature Range: -55°C to 150°C

Substitute parts are classified into two categories:

Direct Equivalents: Parts meeting all primary matching criteria with identical electrical specifications and active product status. These include onsemi variants (MMSZ4686T1G, MMSZ3V9T1G), automotive-qualified variants (SZMMSZ4686T1G, SZMMSZ3V9T1G), and cross-manufacturer equivalents (DDZ9686-7, MMSZ4686-TP).

Functional Equivalents: Parts meeting core voltage, power, and package requirements with minor variations in secondary parameters such as impedance or reverse leakage current. These include MMSZ5228BT1G, SZMMSZ5228BT1G, and MMSZ5228B-TP, which maintain 3.9 V nominal voltage and 500 mW power rating but exhibit different impedance characteristics.

Similar Parts: Parts with matching voltage and package specifications but reduced power rating (370 mW vs. 500 mW), such as BZT52C3V9-13-F, suitable only for applications with lower power dissipation requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vz (Nom)	Tolerance	Power Max	Vf (Max) @ If	Temp Range	Package	RoHS Status
MMSZ4686	onsemi	Obsolete	3.9 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Not Specified
MMSZ4686T1G	onsemi	Active	3.9 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	ROHS3 Compliant
MMSZ3V9T1G	onsemi	Active	3.9 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	ROHS3 Compliant
MMSZ5228BT1G	onsemi	Active	3.9 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	ROHS3 Compliant
SZMMSZ3V9T1G	onsemi	Active	3.9 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	ROHS3 Compliant
SZMMSZ4686T1G	onsemi	Active	3.9 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	ROHS3 Compliant
SZMMSZ5228BT1G	onsemi	Active	3.9 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	ROHS3 Compliant
DDZ9686-7	Diodes Incorporated	Active	3.9 V	±5%	500 mW	900 mV @ 10 mA	-65 to 150°C	SOD-123	ROHS3 Compliant
MMSZ4686-TP	Micro Commercial Co	Active	3.9 V	±5%	500 mW	950 mV @ 10 mA	-55 to 150°C	SOD-123	ROHS3 Compliant
MMSZ5228B-TP	Micro Commercial Co	Active	3.9 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	ROHS3 Compliant
BZT52C3V9-13-F	Diodes Incorporated	Active	3.9 V	±5.13%	370 mW	900 mV @ 10 mA	-65 to 150°C	SOD-123	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalents:

MMSZ4686T1G (onsemi) and MMSZ3V9T1G (onsemi) are the preferred direct substitutes. Both are active products with ROHS3 compliance, identical electrical specifications to the obsolete MMSZ4686, and substantial inventory availability (35,300 and 18,645 pieces respectively). These parts maintain full parameter compatibility including 3.9 V nominal voltage, 500 mW power rating, and SOD-123 packaging.

Automotive Applications:

For designs requiring automotive-grade components, SZMMSZ4686T1G and SZMMSZ3V9T1G are qualified to AEC-Q101 standard with automotive grade designation. These variants provide equivalent electrical performance with automotive supply chain assurance.

Cross-Manufacturer Alternative:

DDZ9686-7 (Diodes Incorporated) provides an active equivalent with extended lower operating temperature limit (-65°C vs. -55°C), ROHS3 compliance, and 18,048 pieces in stock. This part is suitable for applications requiring broader temperature coverage.

Secondary Alternative:

MMSZ4686-TP (Micro Commercial Co) is an active equivalent with identical core specifications. Forward voltage specification is 950 mV @ 10 mA (versus 900 mV @ 10 mA for primary recommendations), representing a 50 mV maximum increase. This part is suitable for applications where this forward voltage variation is acceptable.

Functional Equivalents with Modified Impedance:

MMSZ5228BT1G, SZMMSZ5228BT1G, and MMSZ5228B-TP maintain 3.9 V nominal voltage and 500 mW power rating but exhibit lower impedance (23 Ohms maximum versus 90 Ohms for standard variants). These parts are suitable for applications where lower dynamic impedance is beneficial or required.

Not Recommended for Direct Substitution:

BZT52C3V9-13-F has reduced power rating (370 mW versus 500 mW) and is suitable only for applications with lower power dissipation requirements. This part should not be used as a direct substitute in designs requiring full 500 mW capability.

Frequently Asked Questions (FAQ)

Q: Can MMSZ4686T1G directly replace the obsolete MMSZ4686?

A: Yes. MMSZ4686T1G is an active equivalent with identical electrical specifications: 3.9 V nominal voltage, ±5% tolerance, 500 mW power rating, 900 mV forward voltage @ 10 mA, and SOD-123 package. The part is ROHS3 compliant and maintains the same operating temperature range (-55°C to 150°C).

Q: What is the difference between MMSZ4686T1G and MMSZ3V9T1G?

A: Both parts are onsemi equivalents with identical core specifications (3.9 V, 500 mW, SOD-123). The primary difference is the base product number designation (MMSZ4686 versus MMSZ3V9). Electrical performance and compatibility are equivalent. Selection between these parts may depend on supplier availability or internal design documentation references.

Q: When should I use automotive-qualified variants (SZMMSZ series)?

A: Automotive-qualified variants (SZMMSZ4686T1G, SZMMSZ3V9T1G, SZMMSZ5228BT1G) are designated as automotive grade and qualified to AEC-Q101 standard. These parts are required for designs subject to automotive supply chain requirements or quality standards. Non-automotive applications may use standard onsemi variants.

Q: What is the significance of the impedance difference between standard and MMSZ5228B variants?

A: Standard variants exhibit maximum impedance of 90 Ohms, while MMSZ5228B variants exhibit 23 Ohms maximum impedance. Lower impedance provides better dynamic response and lower output impedance at the Zener operating point. Selection depends on circuit requirements for transient response and noise filtering characteristics.

Q: Can MMSZ4686-TP be used if forward voltage specification is 950 mV instead of 900 mV?

A: MMSZ4686-TP (Micro Commercial Co) has a maximum forward voltage specification of 950 mV @ 10 mA, compared to 900 mV @ 10 mA for primary recommendations. This 50 mV difference is within typical circuit tolerance margins for most applications. Compatibility depends on specific circuit design requirements for forward voltage drop.

Q: Is BZT52C3V9-13-F a suitable substitute?

A: BZT52C3V9-13-F is not a direct substitute due to reduced power rating (370 mW versus 500 mW). This part is suitable only for applications with lower power dissipation requirements. Use this part only if circuit analysis confirms that maximum power dissipation does not exceed 370 mW.

Q: What packaging options are available for these substitutes?

A: Substitute parts are available in Cut Tape (CT) & Digi-Reel packaging and Tape & Reel (TR) packaging. All parts maintain SOD-123 surface mount package format. Packaging selection depends on manufacturing process requirements and volume handling procedures.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original MMSZ4686 (obsolete) does not specify RoHS status. All recommended substitutes meet current RoHS3 environmental compliance requirements.

Q: What is the temperature range difference between DDZ9686-7 and other substitutes?

A: DDZ9686-7 (Diodes Incorporated) operates from -65°C to 150°C, compared to -55°C to 150°C for most onsemi variants. The extended lower temperature limit (-65°C versus -55°C) provides 10°C additional cold-temperature margin. This extended range is beneficial for applications in extreme cold environments or military specifications.

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