MMBZ5253B-E3-08 Equivalent & Substitute Parts

Part Overview

The MMBZ5253B-E3-08 is a Zener diode rated at 25 V nominal voltage with 225 mW power dissipation in a surface mount SOT-23-3 package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, equivalent substitute parts with identical or enhanced electrical specifications are available from active manufacturers. Substitutes maintain the same zener voltage, tolerance, and package form factor while offering improved long-term supply chain reliability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	25	V
Tolerance	±5%	%
Power - Max	225	mW
Impedance (Max)	35	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 19 V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5253B-E3-08 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage: 25 V nominal
Tolerance: ±5%
Impedance (Max): 35 Ohms
Reverse leakage current: 100 nA @ 19 V
Package / Case: SOT-23-3 (TO-236)

Acceptable Variations:

Power dissipation rating may be equal or greater than 225 mW
Operating temperature range may be extended (lower minimum or higher maximum)
Forward voltage specifications may be provided on active alternatives

All substitute parts listed maintain identical zener voltage, tolerance, impedance, and reverse leakage specifications. Packaging is mechanically and electrically compatible. Substitutes are sourced from active manufacturers with current production status, ensuring supply chain continuity.

Parameter Comparison

Parameter	MMBZ5253B-E3-08 (Vishay)	MMBZ5253BLT1G (onsemi)	SZMMBZ5253BLT1G (onsemi)	CMPZ5253B TR PBFREE (Central Semiconductor)
Voltage - Zener (Nom)	25 V	25 V	25 V	25 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	225 mW	225 mW	225 mW	350 mW
Impedance (Max)	35 Ohms	35 Ohms	35 Ohms	35 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 19 V	100 nA @ 19 V	100 nA @ 19 V	100 nA @ 19 V
Voltage - Forward (Vf) (Max) @ If	—	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature Range	-55 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Automotive Grade / AEC-Q101	—	—	Yes	—

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

MMBZ5253BLT1G and SZMMBZ5253BLT1G from onsemi are direct electrical equivalents with active product status. Both maintain all critical electrical parameters identical to the original part. SZMMBZ5253BLT1G carries automotive-grade qualification (AEC-Q101), making it suitable for applications requiring automotive component standards. Both offer extended operating temperature range (-65°C minimum versus -55°C) and are available in higher inventory quantities.

Enhanced Alternative:

CMPZ5253B TR PBFREE from Central Semiconductor Corp provides increased power dissipation capability (350 mW versus 225 mW) while maintaining all other electrical specifications. This part is suitable for applications where thermal margin or higher power handling is beneficial. It retains active product status and full compliance certifications.

Selection Basis:

All substitute parts are ROHS3 compliant, MSL 1 rated, and REACH unaffected. Selection between onsemi and Central Semiconductor alternatives depends on supply chain preference, inventory availability, and application-specific requirements for automotive qualification or enhanced power rating.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5253BLT1G directly replace MMBZ5253B-E3-08 in existing designs?

A: Yes. MMBZ5253BLT1G maintains identical zener voltage (25 V), tolerance (±5%), impedance (35 Ohms), reverse leakage current (100 nA @ 19 V), and SOT-23-3 package specifications. The part is electrically and mechanically compatible without design modification.

Q: What is the difference between MMBZ5253BLT1G and SZMMBZ5253BLT1G?

A: Both parts are electrically identical. SZMMBZ5253BLT1G carries automotive-grade qualification and AEC-Q101 certification, making it suitable for automotive applications. MMBZ5253BLT1G is the standard industrial-grade equivalent. Both are manufactured by onsemi and available in tape and reel packaging.

Q: Why is CMPZ5253B TR PBFREE rated at 350 mW instead of 225 mW?

A: CMPZ5253B TR PBFREE from Central Semiconductor Corp provides enhanced power dissipation capability. All other electrical parameters remain identical to the original specification. The higher power rating provides additional thermal margin and is suitable for applications with higher power requirements or thermal constraints.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's compliance status.

Q: What is the operating temperature range difference?

A: The original MMBZ5253B-E3-08 operates from -55°C to 150°C. All substitute parts extend the minimum operating temperature to -65°C while maintaining the 150°C maximum. This extended range provides improved performance in low-temperature environments.

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

A: Yes. All parts use the SOT-23-3 (TO-236) surface mount package. Mechanical footprint, pin configuration, and PCB layout compatibility are identical. No design changes are required for package substitution.

Q: Which substitute part should be selected for automotive applications?

A: SZMMBZ5253BLT1G is qualified to AEC-Q101 automotive standards and carries automotive-grade designation. This part is the appropriate selection for automotive circuit applications requiring component qualification documentation.

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