MMBZ5223B Zener Diode Equivalent & Substitute Parts

Part Overview

The MMBZ5223B is a 2.7 V Zener diode manufactured by onsemi, rated for 350 mW maximum power dissipation in a surface mount SOT-23-3 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Zener diodes in this voltage and power class are used for voltage regulation, overvoltage protection, and reference voltage applications in electronic circuits. The MMBZ5223B serves as a reference point for identifying compatible alternatives from active product lines that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	2.7	V
Tolerance	±5%
Power - Maximum	350	mW
Impedance (Maximum)	30	Ohms
Current - Reverse Leakage @ 1 V	75	µA
Voltage - Forward (Maximum) @ 10 mA	900	mV
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	SOT-23-3 (TO-236-3, SC-59)

Substitute Part Grouping Explanation

Substitution of the MMBZ5223B is determined by the following critical parameters:

Electrical Compatibility Requirements:

Zener voltage must be 2.7 V nominal
Voltage tolerance must be ±5% or tighter
Maximum power dissipation must be ≥350 mW
Impedance (Zzt) must be ≤30 Ohms
Reverse leakage current must be ≤75 µA @ 1 V
Forward voltage must not exceed 900 mV @ 10 mA

Mechanical Compatibility Requirements:

Package must be SOT-23-3 (TO-236-3 or SC-59 equivalent)
Surface mount configuration required
Operating temperature range must encompass -55°C to 150°C

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Equivalents: Parts with identical electrical specifications (2.7 V, ±5%, 350 mW, 30 Ohms impedance) from alternative manufacturers or packaging variants.

Similar Substitutes: Parts meeting all critical electrical parameters but with variations in power rating, impedance, or tolerance that remain within acceptable operating margins.

Upgraded Alternatives: Active production parts with enhanced specifications or compliance certifications suitable for replacement in new designs.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ 1V (µA)	Vf @ 10mA (mV)	Temp Range (°C)	Status
MMBZ5223B	onsemi	2.7	±5%	350	30	75	900	-55 to 150	Obsolete
MMBZ5223BLT1G	onsemi	2.7	±5%	225	30	75	900	-65 to 150	Active
MMBZ5223B-7-F	Diodes Incorporated	2.7	±5%	350	30	75	900	-65 to 150	Active
CMPZ5223B TR PBFREE	Central Semiconductor Corp	2.7	±5%	350	30	75	900	-65 to 150	Active
BZX84C2V7LT1G	onsemi	2.7	±7%	225	100	20	900	-65 to 150	Active
BZX84B2V7-7-F	Diodes Incorporated	2.7	±2%	300	100	20	900	-65 to 150	Active
BZX84B2V7-TP	Micro Commercial Co	2.7	±2%	350	100	20	900	-55 to 150	Active
BZX84C2V7-TP	Micro Commercial Co	2.7	±5%	350	100	20	900	-55 to 150	Active
BZX84-A2V7,215	Nexperia USA Inc.	2.7	±1%	250	100	20	900	-65 to 150	Active
CZRT5223B-G	Comchip Technology	2.7	±5%	300	30	75	900	-65 to 150	Active
MMBZ5223B-TP	Micro Commercial Co	2.7	±5%	350	30	75	900	-55 to 150	Active

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement:

MMBZ5223B-7-F (Diodes Incorporated) provides the closest electrical and mechanical match to the obsolete MMBZ5223B. This part maintains identical specifications across all critical parameters: 2.7 V nominal voltage, ±5% tolerance, 350 mW power rating, 30 Ohms impedance, and 75 µA reverse leakage current. The extended operating temperature range (-65°C to 150°C) provides improved thermal coverage. RoHS3 compliance and active product status ensure long-term availability.

Alternative for Cost-Optimized Designs:

CMPZ5223B TR PBFREE (Central Semiconductor Corp) offers identical electrical specifications with active status and RoHS3 compliance. This part is suitable for applications where the full 350 mW power rating is required with matching impedance characteristics.

For Automotive or High-Reliability Applications:

BZX84-A2V7,215 (Nexperia USA Inc.) is qualified to AEC-Q101 automotive standards with ±1% voltage tolerance, providing superior voltage regulation accuracy. While the 250 mW power rating is lower than the original, this part is appropriate for applications with reduced power dissipation requirements. The tighter tolerance supports precision voltage reference circuits.

For Lower Power Applications:

MMBZ5223BLT1G (onsemi) reduces power dissipation to 225 mW while maintaining ±5% tolerance and 30 Ohms impedance. This part is suitable for applications where the full 350 mW rating is not required, offering improved thermal performance and extended operating range (-65°C to 150°C).

For Impedance-Sensitive Applications:

Parts with 100 Ohms impedance (BZX84 series) exhibit different dynamic characteristics compared to the 30 Ohms impedance of the MMBZ5223B. These alternatives are suitable only when circuit design accommodates higher impedance values or when lower reverse leakage current (20 µA vs. 75 µA) is beneficial.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5223BLT1G replace MMBZ5223B in all applications?

A: MMBZ5223BLT1G is electrically compatible for applications where 225 mW power dissipation is sufficient. The reduced power rating limits use in high-current or high-dissipation circuits. Verify circuit power requirements before substitution.

Q: What is the difference between 30 Ohms and 100 Ohms impedance in Zener diodes?

A: Impedance (Zzt) affects the dynamic voltage regulation characteristics. Lower impedance (30 Ohms) provides better voltage stability under load changes. Higher impedance (100 Ohms) results in greater voltage variation with current changes. Select based on circuit regulation requirements.

Q: Are BZX84 series parts direct replacements for MMBZ5223B?

A: BZX84 series parts maintain the same 2.7 V nominal voltage and SOT-23-3 package but differ in impedance (100 Ohms vs. 30 Ohms) and reverse leakage current (20 µA vs. 75 µA). These differences affect circuit performance in voltage regulation and protection applications. Electrical simulation or testing is necessary to confirm compatibility in specific circuits.

Q: Why do some substitutes have lower power ratings?

A: Lower power ratings (225 mW vs. 350 mW) reflect different die designs and thermal characteristics. These parts are suitable for applications with lower power dissipation requirements. Verify that circuit operating conditions do not exceed the substitute part's power rating.

Q: What does ±1% tolerance mean compared to ±5%?

A: Tolerance specifies the allowable deviation from the nominal 2.7 V zener voltage. ±1% tolerance (BZX84-A2V7,215) provides tighter voltage regulation (±27 mV) compared to ±5% tolerance (±135 mV). Tighter tolerance is beneficial for precision voltage reference applications.

Q: Are all substitute parts RoHS3 compliant?

A: All listed active substitute parts are RoHS3 compliant. The obsolete MMBZ5223B does not carry RoHS3 designation. Compliance status is important for applications subject to environmental regulations or customer requirements.

Q: Can I use automotive-qualified parts (AEC-Q101) in non-automotive applications?

A: Yes. Automotive-qualified parts meet or exceed commercial specifications and are suitable for any application. BZX84-A2V7,215 carries AEC-Q101 qualification and can be used in commercial, industrial, or automotive designs.

Q: What is the significance of operating temperature range differences?

A: The MMBZ5223B operates from -55°C to 150°C. Most active substitutes extend the lower limit to -65°C, providing improved cold-temperature performance. Verify that application requirements fall within the selected part's temperature range.

Q: How do I determine which substitute is best for my circuit?

A: Identify the critical parameters for your application: required power dissipation, voltage regulation accuracy (tolerance), impedance sensitivity, and operating temperature range. Match these requirements to the substitute part specifications in the parameter comparison table.

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