MMBZ5227B_D87Z Equivalent & Substitute Parts

Part Overview

The MMBZ5227B_D87Z is a Zener diode rated at 3.6 V nominal with 350 mW maximum power dissipation in a surface mount SOT-23-3 package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical specifications while offering improved availability and active product support.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.6	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	24	Ohms
Current - Reverse Leakage @ Vr	15	µA @ 1 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	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5227B_D87Z is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 3.6 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Forward voltage: 900 mV @ 10 mA

Secondary Compatibility Factors:

Power rating: 350 mW (exact match) or lower ratings with design margin verification
Impedance: 24 Ohms (preferred) or higher impedance variants
Reverse leakage: 15 µA @ 1 V (preferred) or lower leakage
Tolerance: ±5% (preferred) or tighter tolerance
Operating temperature range: -55°C to 150°C minimum

Substitute parts are grouped into three categories based on electrical equivalence:

Direct Equivalents: Parts matching all primary criteria with identical power ratings and impedance specifications.

Functional Equivalents: Parts matching primary criteria with reduced power ratings or modified impedance, suitable for applications with lower power dissipation requirements.

Cross-Manufacturer Equivalents: Parts from alternative manufacturers meeting primary criteria with potential variations in secondary parameters.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Leakage (µA @ 1V)	Vf (mV @ 10mA)	Temp Range (°C)	Product Status
MMBZ5227B_D87Z	onsemi	3.6	±5%	350	24	15	900	-55 to 150	Obsolete
MMBZ5227BLT1G	onsemi	3.6	±5%	225	24	15	900	-65 to 150	Active
MMBZ5227B-7-F	Diodes Incorporated	3.6	±5%	350	24	15	900	-65 to 150	Active
BZX84-A3V6,215	Nexperia USA Inc.	3.6	±1%	250	90	5	900	-65 to 150	Active
BZX84C3V6-7-F	Diodes Incorporated	3.6	±6%	300	90	5	900	-65 to 150	Active
BZX84C3V6-TP	Micro Commercial Co	3.6	±6%	350	90	5	900	-55 to 150	Active
CZRT5227B-G	Comchip Technology	3.6	±5%	300	24	15	900	-65 to 150	Active
CZRT55C3V6-G	Comchip Technology	3.6	±6%	350	90	5	900	-65 to 150	Active
MMBZ5227B-TP	Micro Commercial Co	3.6	±5%	350	24	15	900	-55 to 150	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

MMBZ5227B-7-F (Diodes Incorporated) and MMBZ5227B-TP (Micro Commercial Co) provide direct electrical equivalence to the MMBZ5227B_D87Z. Both parts maintain identical voltage regulation characteristics (3.6 V ±5%), power dissipation (350 mW), and impedance (24 Ohms). Both are active products with RoHS3 compliance and unlimited moisture sensitivity rating. MMBZ5227B-7-F extends the operating temperature range to -65°C, providing enhanced low-temperature performance.

Primary Functional Equivalent:

MMBZ5227BLT1G (onsemi) maintains the same manufacturer lineage with identical voltage tolerance (±5%) and impedance (24 Ohms). The reduced power rating (225 mW versus 350 mW) requires design verification for applications approaching maximum power dissipation limits. This part offers extended low-temperature operation (-65°C) and is actively manufactured.

Alternative Equivalents with Modified Characteristics:

CZRT5227B-G (Comchip Technology) matches the impedance specification (24 Ohms) and tolerance (±5%) with 300 mW power rating. This part is suitable for applications with moderate power dissipation requirements.

CZRT55C3V6-G (Comchip Technology) and BZX84C3V6-TP (Micro Commercial Co) provide 350 mW power ratings with increased impedance (90 Ohms). These parts are suitable for applications tolerant of higher dynamic impedance.

Precision Alternative:

BZX84-A3V6,215 (Nexperia USA Inc.) offers tighter voltage tolerance (±1%) with AEC-Q101 automotive qualification. The 250 mW power rating and 90 Ohms impedance require design margin assessment. This part is recommended for applications requiring enhanced voltage regulation precision.

All substitute parts maintain SOT-23-3 package compatibility, surface mount mounting type, and 900 mV forward voltage specification. Selection should be based on specific application requirements for power dissipation, impedance, and temperature range.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5227BLT1G replace MMBZ5227B_D87Z in all applications?

A: MMBZ5227BLT1G is electrically compatible for voltage regulation and impedance characteristics. The reduced power rating (225 mW versus 350 mW) requires verification that the application does not exceed this dissipation limit. If the design operates below 225 mW, direct substitution is valid.

Q: What is the difference between parts with 24 Ohms and 90 Ohms impedance?

A: Impedance affects the dynamic response of the Zener diode under transient conditions. Lower impedance (24 Ohms) provides faster voltage regulation response. Higher impedance (90 Ohms) results in slower transient response but may be acceptable in applications with stable load conditions. Selection depends on circuit requirements for voltage stability under load changes.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant. The original MMBZ5227B_D87Z does not specify RoHS status. All substitute parts carry unlimited moisture sensitivity rating (MSL 1).

Q: Can BZX84-A3V6,215 be used as a direct replacement?

A: BZX84-A3V6,215 maintains the 3.6 V nominal voltage and SOT-23-3 package. The tighter tolerance (±1%), reduced power rating (250 mW), and higher impedance (90 Ohms) represent functional differences. This part is suitable for applications requiring precision voltage regulation with lower power dissipation. Design verification is required for applications approaching 250 mW dissipation.

Q: What is the temperature range consideration for substitute selection?

A: The original MMBZ5227B_D87Z operates from -55°C to 150°C. Most substitute parts extend the low-temperature limit to -65°C, providing enhanced cold-temperature performance. All parts maintain the 150°C upper limit. Selection based on temperature range depends on application requirements.

Q: Are there packaging differences between substitute parts?

A: All substitute parts use SOT-23-3 package (also designated TO-236-3 or SC-59). Packaging is mechanically and electrically identical. Supplier device package designations may vary (SOT-23-3 versus SOT-23 versus TO-236AB) but refer to the same physical package.

Q: Which substitute part has the best availability?

A: MMBZ5227B-7-F (Diodes Incorporated) shows the highest inventory level at 264,218 pieces. MMBZ5227BLT1G (onsemi) has 80,100 pieces in stock. Both parts are actively manufactured with consistent supply.

Q: Can tolerance differences affect circuit performance?

A: The original part specifies ±5% tolerance. Substitute parts range from ±1% (BZX84-A3V6,215) to ±6% (BZX84C3V6-7-F, CZRT55C3V6-G). Tighter tolerance provides more precise voltage regulation. Wider tolerance may require circuit design margin adjustment. Selection depends on application sensitivity to voltage variation.

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