MMSZ5227B Equivalent & Substitute Parts

Part Overview

The MMSZ5227B is a Zener diode rated at 3.6 V nominal with 500 mW power dissipation in a surface mount SOD-123 package. Manufactured by onsemi, this component is classified as obsolete. The identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and legacy system support. Substitute parts must maintain electrical compatibility across voltage regulation, power handling, and thermal operating ranges while accommodating packaging and qualification requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.6	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	24	Ohms
Current - Reverse Leakage @ Vr	15	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

Substitute parts are classified into four categories based on electrical and mechanical compatibility with the MMSZ5227B:

Direct Manufacturer Equivalents (onsemi): Parts maintaining identical electrical specifications (3.6 V nominal, ±5% tolerance, 500 mW power rating, 24 Ohms impedance, 15 µA reverse leakage) with active product status and RoHS3 compliance. These parts differ only in packaging format (Cut Tape & Digi-Reel or Tape & Reel) or include automotive-grade qualification (AEC-Q101).

Parametric Equivalents (onsemi Automotive): Parts with identical electrical specifications and automotive qualification (AEC-Q101) in Tape & Reel packaging, providing enhanced reliability for automotive applications while maintaining full electrical compatibility.

Cross-Manufacturer Upgrade (Diodes Incorporated): A part with matching electrical specifications and extended lower operating temperature limit (-65°C vs. -55°C), offering improved thermal performance in demanding environments.

Similar Parts (Vishay and Nexperia): Parts with matching 3.6 V nominal voltage and ±5% tolerance but reduced power ratings (410 mW or 375 mW) and different impedance characteristics. These are suitable for applications with lower power dissipation requirements. Nexperia part includes automotive qualification and SOD-123F package variant.

Substitution eligibility is determined by: nominal Zener voltage (3.6 V), tolerance (±5%), power rating (500 mW minimum for direct equivalents), impedance (24 Ohms for direct equivalents), reverse leakage current, forward voltage, operating temperature range, and package type (SOD-123 or SOD-123F).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	Status
MMSZ5227B	onsemi	3.6 V	±5%	500 mW	24 Ω	15 µA @ 1 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Obsolete
MMSZ3V6T1G	onsemi	3.6 V	±5%	500 mW	90 Ω	5 µA @ 1 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active
MMSZ4685T1G	onsemi	3.6 V	±5%	500 mW	—	7.5 µA @ 2 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active
MMSZ5227BT1G	onsemi	3.6 V	±5%	500 mW	24 Ω	15 µA @ 1 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active
SZMMSZ3V6T1G	onsemi	3.6 V	±5%	500 mW	90 Ω	5 µA @ 1 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active
SZMMSZ4685T1G	onsemi	3.6 V	±5%	500 mW	—	7.5 µA @ 2 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active
SZMMSZ5227BT1G	onsemi	3.6 V	±5%	500 mW	24 Ω	15 µA @ 1 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active
MMSZ5227B-7-F	Diodes Incorporated	3.6 V	±5%	500 mW	24 Ω	15 µA @ 1 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Active
BZT52B3V6-G3-18	Vishay	3.6 V	±2%	410 mW	95 Ω	—	—	-55 to 150°C	SOD-123	Active
BZT52C3V6-G3-18	Vishay	3.6 V	±5%	410 mW	95 Ω	—	—	-55 to 150°C	SOD-123	Active
BZT52H-C3V6,115	Nexperia	3.6 V	±5%	375 mW	95 Ω	5 µA @ 1 V	900 mV @ 10 mA	-65 to 150°C	SOD-123F	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): MMSZ5227BT1G is the primary direct substitute, offering identical electrical specifications (3.6 V, ±5%, 500 mW, 24 Ω impedance, 15 µA reverse leakage) with active product status and RoHS3 compliance. This part is available in Cut Tape & Digi-Reel packaging.

For Automotive Applications: SZMMSZ5227BT1G provides identical electrical specifications with automotive-grade qualification (AEC-Q101) and Tape & Reel packaging, suitable for automotive systems requiring enhanced reliability certification.

For Extended Temperature Performance: MMSZ5227B-7-F (Diodes Incorporated) maintains all electrical specifications while extending the lower operating temperature to -65°C, providing improved performance in extreme cold environments.

For Lower Power Dissipation Applications: BZT52C3V6-G3-18 (Vishay) or BZT52H-C3V6,115 (Nexperia) are suitable when circuit design permits reduced power ratings (410 mW or 375 mW respectively). The Nexperia part includes automotive qualification and extended temperature range (-65°C).

Compliance Considerations: All recommended substitutes maintain RoHS3 compliance and REACH unaffected status. Automotive applications should prioritize parts with AEC-Q101 qualification (SZMMSZ5227BT1G or BZT52H-C3V6,115).

Frequently Asked Questions (FAQ)

Q: Can MMSZ3V6T1G or SZMMSZ3V6T1G replace MMSZ5227B directly? A: These parts maintain identical voltage (3.6 V), tolerance (±5%), power rating (500 mW), and operating temperature range. However, they differ in impedance (90 Ω vs. 24 Ω) and reverse leakage current (5 µA vs. 15 µA). Direct substitution is acceptable only if circuit design does not depend on the lower impedance or higher leakage characteristics of the original part.

Q: What is the difference between MMSZ5227BT1G and SZMMSZ5227BT1G? A: Both parts are electrically identical (3.6 V, ±5%, 500 mW, 24 Ω impedance). The primary difference is packaging: MMSZ5227BT1G is supplied in Cut Tape & Digi-Reel format, while SZMMSZ5227BT1G is supplied in Tape & Reel format. SZMMSZ5227BT1G includes automotive-grade qualification (AEC-Q101), making it suitable for automotive applications.

Q: Why do Vishay and Nexperia parts have lower power ratings? A: BZT52B3V6-G3-18, BZT52C3V6-G3-18, and BZT52H-C3V6,115 are rated at 410 mW or 375 mW respectively, compared to the MMSZ5227B's 500 mW. These parts are suitable only for applications where the circuit design accommodates the reduced power dissipation capability. Use these parts only if thermal analysis confirms adequate margin.

Q: Is the SOD-123F package compatible with SOD-123 footprints? A: SOD-123F is a variant of SOD-123 with enhanced thermal characteristics. While mechanically similar, PCB footprint compatibility must be verified with the specific component datasheet. The BZT52H-C3V6,115 (SOD-123F) may require footprint adjustment.

Q: Which substitute offers the best performance for automotive applications? A: SZMMSZ5227BT1G or BZT52H-C3V6,115 are recommended for automotive use. Both include AEC-Q101 qualification. SZMMSZ5227BT1G maintains identical electrical specifications, while BZT52H-C3V6,115 offers extended temperature range (-65°C) and automotive qualification with reduced power rating.

Q: Can MMSZ5227B-7-F (Diodes Incorporated) be used in place of the onsemi part? A: Yes. MMSZ5227B-7-F maintains identical electrical specifications (3.6 V, ±5%, 500 mW, 24 Ω impedance, 15 µA reverse leakage) and extends the lower operating temperature to -65°C. This cross-manufacturer substitute is suitable for applications requiring improved cold-temperature performance.

Q: What is the significance of impedance differences between substitute parts? A: Impedance (Zzt) affects the Zener diode's dynamic response and voltage regulation stability. The MMSZ5227B has 24 Ω impedance, while MMSZ3V6T1G and similar parts have 90 Ω. Lower impedance provides better voltage regulation under transient conditions. Substitution with higher impedance parts is acceptable only if circuit design does not require tight voltage regulation or fast transient response.

Q: Are all listed substitutes in active production? A: The original MMSZ5227B is obsolete. All recommended substitutes are in active production status with confirmed inventory availability. MMSZ5227BT1G and SZMMSZ5227BT1G are the closest active equivalents from onsemi.

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