MMBZ5226B Zener Diode 3.3V 350mW SOT-23-3 Equivalent & Substitute Parts

Part Overview

The MMBZ5226B is a surface mount Zener diode manufactured by onsemi, rated for 3.3V nominal Zener voltage with 350mW maximum power dissipation in a SOT-23-3 package. This component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts with active product status are necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical specifications while offering improved availability and compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	28	Ohms
Current - Reverse Leakage @ Vr	25	µA @ 1V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution logic for the MMBZ5226B is based on the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 3.3V (exact match required)
Package / Case: SOT-23-3 (mechanical and electrical compatibility)
Mounting Type: Surface Mount (assembly process compatibility)
Operating Temperature Range: Minimum -55°C to 150°C (functional envelope)

Secondary Compatibility Parameters:

Power - Max: 350mW or higher (equal or greater rating acceptable)
Impedance (Max): Electrical characteristic for circuit performance
Tolerance: ±5% or tighter (±2% or ±6% acceptable within design margin)
Reverse Leakage Current: Specified at 1V reference

Substitute parts are grouped into two categories:

Category 1: onsemi Active Alternatives Parts BZX84B3V3LT1G, BZX84C3V3LT1G, MMBZ5226BLT1G, and automotive-grade SZBZX84 series maintain the 3.3V Zener specification with active product status and RoHS3 compliance. Power ratings range from 225mW to 250mW, which are lower than the original 350mW but remain within acceptable substitution parameters for most applications.

Category 2: Cross-Manufacturer Direct Equivalents Parts BZX84C3V3-TP (Micro Commercial Co) and CMPZ5226B (Central Semiconductor Corp) provide direct electrical equivalence with 350mW power rating matching the original specification. These maintain identical Zener voltage, tolerance, and package specifications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Temp Range	Status	RoHS
MMBZ5226B	onsemi	3.3V	±5%	350mW	28Ω	-55 to 150°C	Obsolete	-
BZX84B3V3LT1G	onsemi	3.3V	±2%	250mW	95Ω	-65 to 150°C	Active	ROHS3
BZX84C3V3LT1G	onsemi	3.3V	±6%	250mW	95Ω	-65 to 150°C	Active	ROHS3
MMBZ5226BLT1G	onsemi	3.3V	±5%	225mW	28Ω	-65 to 150°C	Active	ROHS3
SZBZX84B3V3LT1G	onsemi	3.3V	±2%	250mW	95Ω	-65 to 150°C	Active	ROHS3
SZBZX84C3V3ET1G	onsemi	3.3V	±6%	225mW	95Ω	-65 to 150°C	Active	ROHS3
SZBZX84C3V3LT1G	onsemi	3.3V	±6%	225mW	95Ω	-65 to 150°C	Active	ROHS3
SZBZX84C3V3LT3G	onsemi	3.3V	±6%	225mW	95Ω	-65 to 150°C	Active	ROHS3
SZMMBZ5226BLT1G	onsemi	3.3V	±5%	225mW	28Ω	-65 to 150°C	Active	ROHS3
BZX84C3V3-TP	Micro Commercial Co	3.3V	±5%	350mW	83Ω	-55 to 150°C	Active	ROHS3
CMPZ5226B BK PBFREE	Central Semiconductor Corp	3.3V	±5%	350mW	28Ω	-65 to 150°C	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

BZX84C3V3-TP and CMPZ5226B BK PBFREE are direct equivalents maintaining the 350mW power rating and ±5% tolerance of the original MMBZ5226B. Both parts are active product status with RoHS3 compliance. BZX84C3V3-TP offers the highest inventory availability (158,720 pcs) and is manufactured by Micro Commercial Co. CMPZ5226B provides identical impedance characteristics (28Ω) matching the original design.

For Active onsemi Alternatives:

MMBZ5226BLT1G and SZMMBZ5226BLT1G maintain the original impedance specification (28Ω) with active product status and RoHS3 compliance. These parts operate at reduced power rating (225mW) but retain ±5% tolerance and extended temperature range (-65°C to 150°C). SZMMBZ5226BLT1G includes automotive-grade qualification (AEC-Q101).

For Automotive Applications:

SZBZX84B3V3LT1G, SZBZX84C3V3ET1G, SZBZX84C3V3LT1G, and SZBZX84C3V3LT3G are automotive-qualified alternatives with AEC-Q101 certification. These parts operate at 225mW to 250mW power ratings with extended temperature range and active product status.

For Tolerance-Critical Applications:

BZX84B3V3LT1G and SZBZX84B3V3LT1G offer ±2% tolerance specification, providing tighter Zener voltage control compared to the original ±5% specification.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower power rating (225mW or 250mW) instead of the original 350mW?

A: Substitution with lower power ratings is permissible if circuit design margins accommodate the reduced dissipation capability. The 3.3V Zener voltage specification remains identical. Circuit analysis must confirm that maximum current through the diode does not exceed the substitute part's power limit under worst-case conditions.

Q: What is the difference between onsemi BZX84 and SZBZX84 series?

A: The SZBZX84 series includes automotive-grade qualification (AEC-Q101) and is designed for automotive applications. Both series maintain identical electrical specifications for the 3.3V Zener voltage rating. Selection depends on application requirements and qualification standards.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant. The original MMBZ5226B does not specify RoHS status due to its obsolete designation. All active alternatives meet current environmental compliance requirements.

Q: Can I interchange parts with different impedance values (28Ω vs 95Ω)?

A: Impedance differences affect circuit performance characteristics. Parts with 28Ω impedance (MMBZ5226BLT1G, SZMMBZ5226BLT1G, CMPZ5226B) maintain the original specification. Parts with 95Ω impedance (BZX84 series) have different dynamic response characteristics and should be evaluated for specific circuit requirements.

Q: What is the difference between packaging options (Tape & Reel vs Cut Tape)?

A: Tape & Reel (TR) and Cut Tape (CT) packaging refer to supply format only. Electrical and mechanical specifications remain identical. Selection depends on assembly process requirements and order quantities.

Q: Is the operating temperature range important for substitution?

A: Operating temperature range defines the functional envelope. The original MMBZ5226B specifies -55°C to 150°C. Substitute parts with extended range (-65°C to 150°C) are fully compatible. Parts must not be used outside their specified temperature range.

Q: Can I use BZX84C3V3-TP from Micro Commercial Co as a direct replacement?

A: Yes. BZX84C3V3-TP maintains identical 3.3V Zener voltage, ±5% tolerance, 350mW power rating, and SOT-23-3 package. It is active product status with RoHS3 compliance and high inventory availability.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is the automotive electronics council qualification standard for discrete semiconductors. Parts with this certification meet automotive industry reliability and quality requirements. These parts are suitable for automotive applications requiring formal qualification documentation.

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