MMBZ5236B_D87Z Equivalent & Substitute Parts

Part Overview

The MMBZ5236B_D87Z is a Zener diode manufactured by onsemi, rated at 7.5 V nominal with 350 mW maximum power dissipation in a surface mount SOT-23-3 package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement. Equivalent parts maintain identical electrical specifications, while substitute parts provide functional alternatives with acceptable parameter variations within engineering tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	7.5	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	6	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 6 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5236B_D87Z is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 7.5 V nominal
Package type: SOT-23-3 surface mount
Mounting type: Surface mount
Tolerance: ±5% or tighter

Secondary Compatibility Factors:

Power dissipation: 350 mW or greater
Impedance: 6 Ohms or lower preferred; up to 15 Ohms acceptable with circuit validation
Reverse leakage current: 3 µA @ 6 V or lower
Forward voltage: 900 mV @ 10 mA maximum
Operating temperature range: Must encompass -55°C to 150°C or equivalent

Substitute parts are grouped into three categories:

Direct Equivalents (Active Status): Parts with identical electrical specifications and active product status, suitable for direct replacement without circuit modification.
Functional Substitutes (Higher Power Rating): Parts with 350 mW or greater power rating, matching impedance characteristics, and active status.
Functional Substitutes (Alternative Impedance): Parts with 7.5 V nominal rating and SOT-23-3 package but with impedance up to 15 Ohms, requiring circuit validation for applications sensitive to dynamic impedance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Status	RoHS
MMBZ5236B_D87Z	onsemi	7.5 V	±5%	350 mW	6 Ω	900 mV @ 10 mA	-55 to 150°C	Obsolete	—
MMBZ5236BLT1G	onsemi	7.5 V	±5%	225 mW	6 Ω	900 mV @ 10 mA	-65 to 150°C	Active	ROHS3
MMBZ5236B-7-F	Diodes Incorporated	7.5 V	±5%	350 mW	6 Ω	900 mV @ 10 mA	-65 to 150°C	Active	ROHS3
MMBZ5236BQ-7-F	Diodes Incorporated	7.5 V	±5%	350 mW	6 Ω	900 mV @ 10 mA	-65 to 150°C	Active	ROHS3
BZX84-A7V5,215	Nexperia USA Inc.	7.5 V	±1%	250 mW	15 Ω	900 mV @ 10 mA	-65 to 150°C	Active	ROHS3
BZX84C7V5-7-F	Diodes Incorporated	7.5 V	±6%	300 mW	15 Ω	900 mV @ 10 mA	-65 to 150°C	Active	ROHS3
BZX84C7V5-TP	Micro Commercial Co	7.5 V	±5%	350 mW	15 Ω	900 mV @ 10 mA	-55 to 150°C	Active	ROHS3
CZRT5236B-G	Comchip Technology	7.5 V	±5%	300 mW	6 Ω	900 mV @ 10 mA	-65 to 150°C	Active	ROHS3
CZRT55C7V5-G	Comchip Technology	7.5 V	±6%	350 mW	15 Ω	900 mV @ 10 mA	-65 to 150°C	Active	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Preferred):

MMBZ5236B-7-F (Diodes Incorporated) and MMBZ5236BQ-7-F (Diodes Incorporated) are the primary recommended substitutes. Both parts maintain identical electrical specifications to the MMBZ5236B_D87Z, including 7.5 V nominal voltage, ±5% tolerance, 350 mW power rating, and 6 Ohm impedance. Both are active products with ROHS3 compliance and extended operating temperature range (-65 to 150°C). MMBZ5236BQ-7-F carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components.

Tier 2 - Functional Substitutes (Lower Power Rating):

MMBZ5236BLT1G (onsemi) provides an active alternative from the original manufacturer with identical electrical characteristics except for reduced power rating (225 mW versus 350 mW). This part is suitable for applications where the 350 mW rating is not required. Extended temperature range (-65 to 150°C) and ROHS3 compliance are provided.

Tier 3 - Functional Substitutes (Alternative Impedance):

BZX84C7V5-TP (Micro Commercial Co), BZX84C7V5-7-F (Diodes Incorporated), CZRT55C7V5-G (Comchip Technology), and BZX84-A7V5,215 (Nexperia USA Inc.) are functional alternatives with 7.5 V nominal voltage and SOT-23-3 packaging. These parts feature impedance values of 15 Ohms, which is higher than the 6 Ohm specification of the main part. Circuit validation is required for applications where dynamic impedance characteristics affect performance. BZX84-A7V5,215 offers tighter tolerance (±1%) and AEC-Q101 automotive qualification.

Tier 4 - Functional Substitutes (Reduced Power Rating with Alternative Impedance):

CZRT5236B-G (Comchip Technology) provides 300 mW power rating with 6 Ohm impedance, suitable for applications where the full 350 mW is not required but low impedance is necessary.

All recommended substitutes are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5236BLT1G replace MMBZ5236B_D87Z in all applications?

A: MMBZ5236BLT1G is electrically equivalent except for power dissipation rating (225 mW versus 350 mW). It is suitable for applications where the circuit does not require the full 350 mW power handling capability. Verify that the maximum power dissipation in your application does not exceed 225 mW.

Q: What is the difference between parts with 6 Ohm and 15 Ohm impedance?

A: Impedance affects the dynamic response of the Zener diode during transient conditions. Lower impedance (6 Ohms) provides faster voltage regulation and lower noise. Higher impedance (15 Ohms) may result in slightly slower transient response. For applications sensitive to voltage ripple or transient overshoot, parts with 6 Ohm impedance are preferred.

Q: Are MMBZ5236B-7-F and MMBZ5236BQ-7-F interchangeable?

A: Yes, both parts are electrically identical with 7.5 V nominal, ±5% tolerance, 350 mW power rating, and 6 Ohm impedance. MMBZ5236BQ-7-F includes AEC-Q101 automotive qualification. Select MMBZ5236BQ-7-F for automotive applications; either part is acceptable for general industrial use.

Q: Why does BZX84-A7V5,215 have ±1% tolerance instead of ±5%?

A: BZX84-A7V5,215 is manufactured to tighter tolerance specifications, providing more precise Zener voltage regulation. This part is suitable for applications requiring higher voltage accuracy. The tighter tolerance does not affect functional compatibility but may impact cost and availability.

Q: Can I use BZX84C7V5-TP if my circuit operates at -65°C?

A: BZX84C7V5-TP has an operating temperature range of -55 to 150°C. It is not rated for operation below -55°C. For applications requiring -65°C operation, select MMBZ5236B-7-F, MMBZ5236BQ-7-F, MMBZ5236BLT1G, BZX84-A7V5,215, BZX84C7V5-7-F, CZRT5236B-G, or CZRT55C7V5-G, all of which support -65°C minimum operating temperature.

Q: Is the SOT-23-3 package identical across all substitute parts?

A: All substitute parts use SOT-23-3 surface mount packaging (also designated TO-236-3 or SC-59). Package dimensions and pin configurations are standardized, ensuring mechanical compatibility on printed circuit boards. Verify footprint compatibility with your PCB design.

Q: Which substitute part has the best availability?

A: BZX84C7V5-7-F (Diodes Incorporated) has the highest inventory level at 54,300 pieces. MMBZ5236BLT1G (onsemi) has 179,100 pieces in stock. Both parts are suitable for high-volume procurement.

Q: Do all substitute parts comply with RoHS and REACH regulations?

A: All active substitute parts listed are ROHS3 compliant and REACH unaffected. The original MMBZ5236B_D87Z does not specify RoHS status. Verify regulatory compliance requirements for your specific application and region.

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