MMBZ5227B Equivalent & Substitute Parts

Part Overview

The MMBZ5227B is a 3.6 V Zener diode rated at 350 mW in a surface mount SOT-23-3 package, manufactured by onsemi. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this Zener diode specification.

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	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5227B is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 3.6 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface mount
Tolerance: ±5% or tighter
Power rating: 350 mW or greater
Forward voltage: 900 mV @ 10 mA
Reverse leakage: 15 µA @ 1 V or lower
Operating temperature range: -55°C to 150°C minimum

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

Direct Equivalents: Parts with identical electrical specifications (3.6 V, 350 mW, ±5% tolerance, 24 Ohms impedance, 15 µA reverse leakage) from alternative manufacturers.

Similar Substitutes: Parts with 3.6 V Zener voltage and SOT-23-3 packaging but with variations in power rating, impedance, reverse leakage, or tolerance. These parts maintain functional compatibility within the specified voltage and package constraints.

Reduced Power Alternatives: Parts with lower power ratings (225 mW, 250 mW, 300 mW) suitable for applications where the full 350 mW capability is not required.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Reverse Leakage (µA @ 1V)	Temp Range (°C)	Status
MMBZ5227B	onsemi	3.6	±5%	350	24	15	-55 to 150	Obsolete
MMBZ5227BLT1G	onsemi	3.6	±5%	225	24	15	-65 to 150	Active
CMPZ5227B TR PBFREE	Central Semiconductor Corp	3.6	±5%	350	24	15	-65 to 150	Active
MMBZ5227B-7-F	Diodes Incorporated	3.6	±5%	350	24	15	-65 to 150	Active
BZX84-A3V6,215	Nexperia USA Inc.	3.6	±1%	250	90	5	-65 to 150	Active
BZX84C3V6 TR PBFREE	Central Semiconductor Corp	3.6	±5%	350	90	5	-65 to 150	Active
BZX84C3V6-7-F	Diodes Incorporated	3.6	±6%	300	90	5	-65 to 150	Active
BZX84C3V6-TP	Micro Commercial Co	3.6	±6%	350	90	5	-55 to 150	Active
CZRT55C3V6-G	Comchip Technology	3.6	±6%	350	90	5	-65 to 150	Active
MMBZ5225BW-7-F	Diodes Incorporated	3.0	±5%	200	30	50	-65 to 150	Active
MMBZ5227B_R1_00001	Panjit International Inc.	3.6	±5%	410	24	15	-55 to 150	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

CMPZ5227B TR PBFREE and MMBZ5227B-7-F are direct functional equivalents to the MMBZ5227B. Both parts maintain identical electrical specifications (3.6 V, 350 mW, ±5% tolerance, 24 Ohms impedance, 15 µA reverse leakage) and SOT-23-3 packaging. Both are active products with RoHS3 compliance and extended operating temperature ranges (-65°C to 150°C). MMBZ5227B-7-F offers the highest inventory availability (264,218 units).

Alternative with Enhanced Specifications:

MMBZ5227B_R1_00001 from Panjit International Inc. provides a 3.6 V Zener with increased power rating (410 mW) while maintaining the 24 Ohms impedance and 15 µA reverse leakage characteristics of the original part. This option is suitable for applications requiring additional thermal margin.

Lower Power Alternatives:

MMBZ5227BLT1G (225 mW) and BZX84C3V6-7-F (300 mW) are suitable for designs where full 350 mW dissipation is not required. These parts reduce thermal load while maintaining 3.6 V Zener voltage and SOT-23-3 packaging.

Higher Impedance Variants:

BZX84C3V6 TR PBFREE, BZX84C3V6-7-F, BZX84C3V6-TP, and CZRT55C3V6-G feature 90 Ohms impedance (compared to 24 Ohms in the original) and lower reverse leakage (5 µA). These parts are suitable for applications where lower leakage current is beneficial, though impedance differences must be evaluated for circuit performance.

Automotive-Grade Option:

BZX84-A3V6,215 from Nexperia USA Inc. is AEC-Q101 qualified and suitable for automotive applications. It provides ±1% tolerance (tighter than the original ±5%), though with reduced power rating (250 mW) and higher impedance (90 Ohms).

Not Recommended:

MMBZ5225BW-7-F operates at 3.0 V nominal Zener voltage, which differs from the 3.6 V specification and is not suitable as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5227BLT1G replace MMBZ5227B in all applications?

A: MMBZ5227BLT1G is electrically compatible with identical Zener voltage (3.6 V), tolerance (±5%), impedance (24 Ohms), and reverse leakage (15 µA). The primary difference is reduced power rating (225 mW versus 350 mW). Substitution is valid for applications where power dissipation does not exceed 225 mW. Thermal analysis of the specific circuit is required to confirm suitability.

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

A: Impedance (Zzt) affects the dynamic resistance of the Zener diode at operating current. Lower impedance (24 Ohms) provides better voltage regulation with changing load current. Higher impedance (90 Ohms) results in greater voltage variation across the diode with load changes. Selection depends on circuit requirements for voltage stability and regulation performance.

Q: Are BZX84C3V6 variants direct replacements for MMBZ5227B?

A: BZX84C3V6 variants maintain 3.6 V Zener voltage and SOT-23-3 packaging but differ in impedance (90 Ohms versus 24 Ohms) and reverse leakage (5 µA versus 15 µA). These parts are functionally compatible for voltage regulation but exhibit different dynamic characteristics. Circuit simulation or testing is recommended to confirm performance equivalence in the specific application.

Q: Why do some substitutes have wider operating temperature ranges?

A: Active production parts often feature extended temperature ranges (-65°C to 150°C) compared to the obsolete MMBZ5227B (-55°C to 150°C). Extended ranges provide additional design margin and are not detrimental to applications operating within the original temperature specification.

Q: Is MMBZ5227B_R1_00001 suitable for designs requiring exactly 350 mW?

A: MMBZ5227B_R1_00001 is rated at 410 mW, exceeding the 350 mW specification. This part is suitable for applications where the original 350 mW rating is required, as it provides additional thermal headroom. The higher power rating does not compromise functionality in circuits designed for 350 mW operation.

Q: What does RoHS3 compliance indicate?

A: RoHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive, restricting the use of lead, cadmium, mercury, and other hazardous materials. All active substitute parts listed are RoHS3 compliant, ensuring compatibility with modern manufacturing and environmental standards.

Q: Can MMBZ5225BW-7-F be used as a substitute?

A: MMBZ5225BW-7-F operates at 3.0 V nominal Zener voltage, which is outside the 3.6 V specification of MMBZ5227B. This part is not suitable as a direct substitute and would result in incorrect voltage regulation in the circuit.

Q: What packaging format is recommended for new designs?

A: All substitute parts are available in SOT-23-3 (TO-236-3, SC-59) surface mount packaging, consistent with the original MMBZ5227B. This packaging is standard for modern surface mount assembly processes. Tape & Reel (TR) packaging is available for high-volume production requirements.

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