MMBZ5226B-TP Equivalent & Substitute Parts

Part Overview

The MMBZ5226B-TP is an active-status Zener diode manufactured by Micro Commercial Co, rated at 3.3 V nominal with 350 mW maximum power dissipation in a surface mount SOT-23 package. This component is designed for voltage regulation and protection applications in electronic circuits. Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when inventory constraints require component alternatives that maintain electrical and mechanical compatibility.

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 @ 1 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5226B-TP is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage (Vz) must be 3.3 V nominal
Voltage tolerance must be ±5%
Impedance (Zzt) must be 28 Ohms maximum
Reverse leakage current must be 25 µA @ 1 V
Forward voltage must be 900 mV maximum @ 10 mA

Mechanical Equivalence Criteria:

Package type must be SOT-23-3 (TO-236-3, SC-59)
Mounting type must be surface mount

Compliance Criteria:

RoHS3 compliance required
REACH unaffected status required
Active product status required

The MMBZ5226BLT1G from onsemi meets all electrical and mechanical equivalence criteria. The maximum power rating differs (225 mW versus 350 mW), which represents a derating condition. This substitute is suitable for applications where the 225 mW power specification is sufficient for the circuit design requirements.

Parameter Comparison

Parameter	MMBZ5226B-TP (Micro Commercial Co)	MMBZ5226BLT1G (onsemi)	Match Status
Voltage - Zener (Nom)	3.3 V	3.3 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	350 mW	225 mW	Substitute Derated
Impedance (Max)	28 Ohms	28 Ohms	Equivalent
Current - Reverse Leakage @ Vr	25 µA @ 1 V	25 µA @ 1 V	Equivalent
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	Equivalent
Operating Temperature Range	-55°C ~ 150°C	-65°C ~ 150°C	Substitute Extended
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

Primary Part Selection: The MMBZ5226B-TP remains the primary selection when the full 350 mW power rating is required by circuit design specifications and when Micro Commercial Co sourcing is preferred.

Substitute Part Selection: The MMBZ5226BLT1G from onsemi is a valid substitute when:

Circuit design power dissipation requirements do not exceed 225 mW
Extended lower operating temperature range (-65°C minimum) provides design margin
onsemi component availability or supply chain preference is a factor
Both parts maintain identical electrical characteristics for zener voltage, tolerance, impedance, leakage current, and forward voltage

Both parts are active-status products with current manufacturing support and full RoHS3 and REACH compliance. No obsolescence risk is present for either component.

Frequently Asked Questions (FAQ)

Q: Can the MMBZ5226BLT1G be used as a direct replacement for the MMBZ5226B-TP?

A: The MMBZ5226BLT1G is electrically and mechanically compatible with the MMBZ5226B-TP for all parameters except maximum power dissipation. The substitute part is rated at 225 mW versus 350 mW. Direct substitution is valid only when circuit power dissipation does not exceed 225 mW.

Q: What is the significance of the power rating difference between these parts?

A: The power rating indicates the maximum continuous power the diode can dissipate without exceeding its junction temperature limit. The MMBZ5226BLT1G at 225 mW represents a derated condition. If your circuit design requires the full 350 mW capability, the MMBZ5226B-TP must be used.

Q: Are the package dimensions identical between these parts?

A: Both parts use the SOT-23-3 package (also designated TO-236-3 or SC-59). Package dimensions and PCB footprints are identical, allowing direct board-level substitution without layout modifications.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the MMBZ5226B-TP and MMBZ5226BLT1G are RoHS3 compliant and REACH unaffected. Both parts meet the same regulatory and environmental standards.

Q: What is the difference in operating temperature range?

A: The MMBZ5226B-TP operates from -55°C to 150°C, while the MMBZ5226BLT1G operates from -65°C to 150°C. The onsemi part provides a 10°C lower minimum operating temperature, which may provide additional design margin in cold-temperature applications.

Q: Are the electrical characteristics identical for zener voltage and tolerance?

A: Yes. Both parts are specified at 3.3 V nominal with ±5% tolerance, 28 Ohms maximum impedance, 25 µA reverse leakage current at 1 V, and 900 mV maximum forward voltage at 10 mA. These parameters are identical across both parts.

Q: What packaging formats are available for each part?

A: The MMBZ5226B-TP is supplied in Tape & Reel (TR) format. The MMBZ5226BLT1G is supplied in Cut Tape (CT) and Digi-Reel® format. Both formats are standard surface mount packaging options suitable for automated assembly.

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