MMBZ5223B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMBZ5223B-TP is a 2.7 V Zener diode manufactured by Micro Commercial Co, rated for 350 mW maximum power dissipation in a surface mount SOT-23 package. This component is classified as Active and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the SOT-23 package family. Alternative sources and variants are necessary to ensure supply chain continuity, accommodate design revisions, and support procurement flexibility across multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.7	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	75	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the MMBZ5223B-TP are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents (Upgrade Category): Parts that match all critical electrical parameters—nominal Zener voltage (2.7 V), tolerance (±5%), maximum power rating (350 mW), impedance (30 Ohms), reverse leakage current (75 µA @ 1 V), and forward voltage (900 mV @ 10 mA)—while maintaining SOT-23 package compatibility. These parts support direct substitution without circuit redesign.

Similar Parts (Functional Alternatives): Parts that maintain the 2.7 V Zener voltage and ±5% to ±7% tolerance but differ in one or more secondary parameters such as maximum power dissipation (225 mW to 300 mW), impedance (30 to 100 Ohms), or reverse leakage current (20 to 75 µA @ 1 V). These parts are suitable for applications where the reduced power rating or modified impedance characteristics are acceptable. Package variants (SOT-523) are included where mechanical footprint compatibility is confirmed.

Substitution eligibility is determined by:

Nominal Zener voltage: 2.7 V (required match)
Voltage tolerance: ±5% to ±7% (acceptable range)
Package compatibility: SOT-23, SOT-23-3, or SOT-523
Operating temperature range: -55°C to -65°C minimum; 150°C maximum
RoHS3 compliance and REACH unaffected status

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt (Ohms)	Reverse Leakage @ Vr (µA @ 1V)	Vf Max @ If (mV @ 10mA)	Temp Range (°C)	Package	Substitution Type
MMBZ5223B-TP	Micro Commercial Co	2.7	±5%	350	30	75 @ 1 V	900 @ 10 mA	-55 to 150	SOT-23	Reference
CMPZ5223B TR PBFREE	Central Semiconductor Corp	2.7	±5%	350	30	75 @ 1 V	900 @ 10 mA	-65 to 150	SOT-23	Direct Equivalent
MMBZ5223B-7-F	Diodes Incorporated	2.7	±5%	350	30	75 @ 1 V	900 @ 10 mA	-65 to 150	SOT-23-3	Direct Equivalent
BZX84C2V7-E3-08	Vishay General Semiconductor - Diodes Division	2.7	±5%	300	100	20 @ 1 V	—	-55 to 150	SOT-23-3	Similar
BZX84C2V7LT1G	onsemi	2.7	±7%	225	100	20 @ 1 V	900 @ 10 mA	-65 to 150	SOT-23-3	Similar
MMBZ5223BLT1G	onsemi	2.7	±5%	225	30	75 @ 1 V	900 @ 10 mA	-65 to 150	SOT-23-3	Similar
MMBZ5223BT-7-F	Diodes Incorporated	2.7	±5%	150	30	75 @ 1 V	900 @ 10 mA	-65 to 150	SOT-523	Similar
SZBZX84C2V7ET1G	onsemi	2.7	±7%	225	100	20 @ 1 V	900 @ 10 mA	-65 to 150	SOT-23-3	Similar (Automotive)
SZBZX84C2V7LT1G	onsemi	2.7	±7%	225	100	20 @ 1 V	900 @ 10 mA	-65 to 150	SOT-23-3	Similar (Automotive)

Engineering Selection Recommendations

Direct Equivalent Selection: The CMPZ5223B TR PBFREE (Central Semiconductor Corp) and MMBZ5223B-7-F (Diodes Incorporated) are direct electrical and mechanical equivalents to the MMBZ5223B-TP. Both parts maintain identical Zener voltage (2.7 V), tolerance (±5%), maximum power dissipation (350 mW), impedance (30 Ohms), and reverse leakage characteristics. Both are ROHS3 compliant and REACH unaffected. The CMPZ5223B TR PBFREE extends the minimum operating temperature to -65°C, providing enhanced low-temperature performance. The MMBZ5223B-7-F from Diodes Incorporated offers equivalent specifications with identical temperature range extension. These parts are suitable for direct substitution in existing designs without circuit modification.

Similar Part Selection: The BZX84C2V7-E3-08 (Vishay), BZX84C2V7LT1G (onsemi), MMBZ5223BLT1G (onsemi), SZBZX84C2V7ET1G (onsemi), and SZBZX84C2V7LT1G (onsemi) are functionally compatible alternatives with reduced maximum power dissipation (225 mW to 300 mW) and modified impedance characteristics (100 Ohms versus 30 Ohms). These parts maintain the 2.7 V Zener voltage and are suitable for applications where the lower power rating is acceptable. The SZBZX84C2V7ET1G and SZBZX84C2V7LT1G variants include automotive-grade qualification (AEC-Q101) and are appropriate for automotive applications requiring enhanced reliability.

Package Variant Consideration: The MMBZ5223BT-7-F (Diodes Incorporated) is available in SOT-523 package with reduced power rating (150 mW). This variant is suitable only for applications where the smaller footprint is required and power dissipation does not exceed 150 mW.

All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can the CMPZ5223B TR PBFREE be used as a direct replacement for the MMBZ5223B-TP?

A: Yes. The CMPZ5223B TR PBFREE is a direct electrical and mechanical equivalent. Both parts share identical Zener voltage (2.7 V), tolerance (±5%), maximum power dissipation (350 mW), impedance (30 Ohms), and reverse leakage current (75 µA @ 1 V). The CMPZ5223B TR PBFREE extends the minimum operating temperature to -65°C, providing additional low-temperature capability. No circuit redesign is required.

Q: What is the difference between the MMBZ5223B-7-F and the MMBZ5223B-TP?

A: The MMBZ5223B-7-F is manufactured by Diodes Incorporated and maintains identical electrical specifications to the MMBZ5223B-TP. The primary difference is the extended minimum operating temperature (-65°C versus -55°C). Both parts are rated for 350 mW maximum power dissipation and 2.7 V Zener voltage with ±5% tolerance. The package designation differs slightly (SOT-23-3 versus SOT-23), but both are mechanically compatible in standard SOT-23 footprints.

Q: Can I substitute the BZX84C2V7LT1G for the MMBZ5223B-TP?

A: The BZX84C2V7LT1G is a functional alternative with the same 2.7 V Zener voltage but differs in secondary parameters. The BZX84C2V7LT1G is rated for 225 mW maximum power dissipation (versus 350 mW), has impedance of 100 Ohms (versus 30 Ohms), and reverse leakage current of 20 µA @ 1 V (versus 75 µA @ 1 V). Substitution is acceptable only if the application does not require the full 350 mW power rating and can tolerate the higher impedance and lower leakage characteristics.

Q: What is the difference between standard and automotive-grade Zener diodes in this list?

A: The SZBZX84C2V7ET1G and SZBZX84C2V7LT1G are automotive-grade variants qualified to AEC-Q101 standard. These parts are designed for automotive applications requiring enhanced reliability and stricter quality assurance. Both maintain the same 2.7 V Zener voltage and 225 mW power rating as their non-automotive counterparts but include automotive-specific qualification and testing protocols.

Q: Why does the MMBZ5223BT-7-F use a different package (SOT-523)?

A: The MMBZ5223BT-7-F is available in SOT-523 package, which is a smaller surface mount package compared to the standard SOT-23. This variant is suitable for space-constrained applications. However, the SOT-523 package limits the maximum power dissipation to 150 mW. Substitution with this part is appropriate only when the smaller footprint is required and the application power dissipation does not exceed 150 mW.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant and REACH unaffected, ensuring regulatory alignment with the original MMBZ5223B-TP component.

Q: What parameters must match for a part to be considered a direct equivalent?

A: Direct equivalents must match the following parameters: nominal Zener voltage (2.7 V), voltage tolerance (±5%), maximum power dissipation (350 mW), impedance (30 Ohms), reverse leakage current (75 µA @ 1 V), and forward voltage (900 mV @ 10 mA). Package compatibility within the SOT-23 family is also required. The CMPZ5223B TR PBFREE and MMBZ5223B-7-F meet all these criteria.

Q: Can I use a part with lower power rating in a high-power application?

A: No. If your application requires the full 350 mW power dissipation capability, you must use a part rated for 350 mW. Substituting with a 225 mW or 150 mW rated part in a high-power application will result in component failure due to thermal stress and exceeding maximum power dissipation limits.

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