MMSZ5226B Zener Diode 3.3V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The MMSZ5226B is a surface mount zener diode manufactured by onsemi, rated for 3.3 V nominal zener voltage with 500 mW maximum power dissipation in SOD-123 packaging. This component is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications. The substitute parts listed maintain electrical and mechanical compatibility while offering active product status and enhanced availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	28	Ohms
Current - Reverse Leakage @ Vr	25	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-55°C to 150°C	-
Mounting Type	Surface Mount	-
Package / Case	SOD-123	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on electrical and mechanical compatibility with the MMSZ5226B:

Direct Manufacturer Substitutes maintain identical electrical specifications (3.3 V nominal zener voltage, ±5% tolerance, 500 mW power rating, SOD-123 package, -55°C to 150°C operating range) with variations in packaging format (Tape & Reel or Cut Tape & Digi-Reel) and product status (Active vs. Obsolete). These parts are interchangeable at the circuit level.

Parametric Equivalents meet the core electrical requirements (3.3 V, 500 mW, SOD-123) but differ in tolerance specification (±2% instead of ±5%) or include automotive-grade qualification (AEC-Q101). These parts function identically in circuit applications while offering enhanced precision or automotive compliance.

Similar Parts maintain the 3.3 V zener voltage and SOD-123 package but differ in power rating (250 mW vs. 500 mW), impedance characteristics, or tolerance specification (±6%). These parts are suitable for applications with reduced power requirements or where impedance variation is acceptable.

Key Parameters for Substitution:

Voltage - Zener (Nom): 3.3 V (critical)
Power - Max: 500 mW (for direct substitutes) or 250 mW (for reduced-power applications)
Package / Case: SOD-123 (mechanical compatibility)
Operating Temperature Range: -55°C to 150°C (minimum requirement)
Mounting Type: Surface Mount (process compatibility)

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ Vr	Vf (Max)	Temp Range	Package	Status	Packaging Type
MMSZ5226B	onsemi	3.3 V	±5%	500 mW	28 Ω	25 µA @ 1 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Obsolete	-
MMSZ3V3T1G	onsemi	3.3 V	±5%	500 mW	95 Ω	5 µA @ 1 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Active	Tape & Reel
MMSZ4684T1G	onsemi	3.3 V	±5%	500 mW	-	7.5 µA @ 1.5 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Active	Cut Tape & Digi-Reel
MMSZ5226BT1G	onsemi	3.3 V	±5%	500 mW	28 Ω	25 µA @ 1 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Active	Cut Tape & Digi-Reel
SZMMSZ3V3T1G	onsemi	3.3 V	±5%	500 mW	95 Ω	5 µA @ 1 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Active	Tape & Reel
SZMMSZ4684T1G	onsemi	3.3 V	±5%	500 mW	-	7.5 µA @ 1.5 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Active	Tape & Reel
MMSZ5226CT1G	onsemi	3.3 V	±2%	500 mW	28 Ω	25 µA @ 1 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Active	Tape & Reel
SZMMSZ5226BT1G	onsemi	3.3 V	±5%	500 mW	28 Ω	25 µA @ 1 V	900 mV @ 10 mA	-55°C to 150°C	SOD-123	Active	Cut Tape & Digi-Reel
MMSZ5226B-7-F	Diodes Incorporated	3.3 V	±5%	500 mW	28 Ω	25 µA @ 1 V	900 mV @ 10 mA	-65°C to 150°C	SOD-123	Active	Cut Tape & Digi-Reel
BZT52C3V3-7-F	Diodes Incorporated	3.3 V	±6%	500 mW	95 Ω	5 µA @ 1 V	900 mV @ 10 mA	-65°C to 150°C	SOD-123	Active	Cut Tape & Digi-Reel
BZT52C3V3LP-7	Diodes Incorporated	3.3 V	±6%	250 mW	95 Ω	5 µA @ 1 V	900 mV @ 10 mA	-65°C to 150°C	0402 (1006 Metric)	Active	Tape & Reel

Engineering Selection Recommendations

Primary Recommendation for Direct Substitution:

MMSZ5226BT1G (onsemi) is the direct functional equivalent to MMSZ5226B. This part maintains identical electrical specifications (3.3 V nominal zener voltage, ±5% tolerance, 500 mW power rating, 28 Ω maximum impedance, 25 µA reverse leakage at 1 V) and SOD-123 package configuration. The primary difference is product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel). This part is suitable for new production and repair applications requiring exact electrical performance matching.

Alternative Recommendations:

MMSZ5226CT1G (onsemi) provides enhanced precision with ±2% tolerance specification while maintaining all other electrical and mechanical parameters identical to MMSZ5226B. This part is appropriate for applications requiring tighter zener voltage control. Product status is Active with RoHS3 compliance.

SZMMSZ5226BT1G (onsemi) is an automotive-grade equivalent with AEC-Q101 qualification, maintaining identical electrical specifications to MMSZ5226B with Active product status. This part is suitable for automotive applications requiring qualified components.

MMSZ5226B-7-F (Diodes Incorporated) provides cross-manufacturer substitution with identical electrical specifications and extended lower operating temperature limit (-65°C vs. -55°C). This part is suitable for applications requiring broader temperature range coverage.

For Reduced Power Applications:

BZT52C3V3LP-7 (Diodes Incorporated) is suitable only for applications where 250 mW power dissipation is acceptable. This part features different package format (0402/1006 Metric) and should not be used as a direct replacement for 500 mW applications.

Compliance Status:

All recommended substitute parts maintain RoHS3 compliance and REACH Unaffected status consistent with the original MMSZ5226B specification.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5226BT1G be used as a direct replacement for MMSZ5226B?

A: Yes. MMSZ5226BT1G is electrically and mechanically identical to MMSZ5226B. Both parts feature 3.3 V nominal zener voltage, ±5% tolerance, 500 mW power rating, 28 Ω maximum impedance, and SOD-123 package. The primary difference is packaging format (Cut Tape & Digi-Reel vs. bulk) and product status (Active vs. Obsolete). Circuit performance is identical.

Q: What is the difference between MMSZ3V3T1G and MMSZ5226BT1G?

A: Both parts share identical zener voltage (3.3 V), tolerance (±5%), power rating (500 mW), and operating temperature range (-55°C to 150°C) in SOD-123 package. The primary electrical difference is impedance specification: MMSZ3V3T1G has 95 Ω maximum impedance with 5 µA reverse leakage at 1 V, while MMSZ5226BT1G has 28 Ω maximum impedance with 25 µA reverse leakage at 1 V. Selection depends on circuit impedance requirements.

Q: Are automotive-grade parts (SZMMSZ series) compatible with standard applications?

A: Yes. Automotive-grade parts (SZMMSZ5226BT1G, SZMMSZ3V3T1G, SZMMSZ4684T1G) with AEC-Q101 qualification maintain identical electrical specifications to their standard counterparts and are fully compatible with non-automotive applications. These parts offer enhanced reliability qualification and are suitable for any application requiring the specified electrical parameters.

Q: Can BZT52C3V3LP-7 replace MMSZ5226B?

A: No. BZT52C3V3LP-7 is not suitable as a direct replacement. While both parts feature 3.3 V zener voltage, BZT52C3V3LP-7 has 250 mW maximum power rating compared to 500 mW for MMSZ5226B. Additionally, BZT52C3V3LP-7 uses 0402 (1006 Metric) package instead of SOD-123. This part is suitable only for applications with reduced power requirements and compatible PCB footprints.

Q: What is the significance of tolerance differences (±2%, ±5%, ±6%)?

A: Tolerance specification defines the allowable variation in zener voltage from the nominal 3.3 V value. MMSZ5226CT1G (±2%) provides the tightest voltage control, MMSZ5226B and MMSZ5226BT1G (±5%) provide standard control, and BZT52C3V3-7-F (±6%) provides broader tolerance. Selection depends on circuit requirements for zener voltage accuracy. Tighter tolerance parts are suitable for precision voltage regulation applications.

Q: Are there packaging format differences between substitute parts?

A: Yes. Substitute parts are available in three packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and bulk. Tape & Reel format is suitable for automated assembly with reel-fed pick-and-place equipment. Cut Tape & Digi-Reel format accommodates both manual and automated assembly. Packaging format selection depends on production equipment and volume requirements but does not affect electrical performance.

Q: What is the operating temperature range difference between onsemi and Diodes Incorporated parts?

A: onsemi parts (MMSZ5226B, MMSZ5226BT1G, MMSZ3V3T1G) operate from -55°C to 150°C. Diodes Incorporated parts (MMSZ5226B-7-F, BZT52C3V3-7-F, BZT52C3V3LP-7) operate from -65°C to 150°C. The extended lower temperature limit (-65°C vs. -55°C) in Diodes Incorporated parts provides broader temperature coverage for applications requiring operation in extreme cold environments.

Q: Is RoHS3 compliance important for part selection?

A: RoHS3 compliance is a regulatory requirement for electronic components in many markets. All recommended substitute parts maintain RoHS3 compliance status consistent with MMSZ5226B. This compliance status should be verified against specific application and regional requirements.

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