MMBZ5253BLT1 Equivalent & Substitute Parts

Part Overview

The MMBZ5253BLT1 is a Zener diode manufactured by onsemi, rated at 25 V nominal voltage with 225 mW maximum power dissipation in a surface mount SOT-23-3 package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. The part operates across a temperature range of -55°C to 150°C and is RoHS non-compliant.

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
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-55°C to 150°C	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5253BLT1 is determined by electrical and mechanical parameter equivalence. The primary substitute identified is the CMPZ5253B TR PBFREE manufactured by Central Semiconductor Corp. Substitution eligibility is established through matching of the following critical parameters:

Zener voltage rating: 25 V nominal with ±5% tolerance
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting configuration: Surface mount
Impedance specification: 35 Ohms maximum
Reverse leakage current: 100 nA @ 19 V
Forward voltage: 900 mV @ 10 mA

The CMPZ5253B TR PBFREE exceeds the power rating of the original part (350 mW versus 225 mW), providing enhanced thermal capability within the same physical package. Both components share identical electrical characteristics for zener voltage, tolerance, impedance, leakage current, and forward voltage specifications.

Parameter Comparison

Parameter	MMBZ5253BLT1 (onsemi)	CMPZ5253B TR PBFREE (Central Semiconductor)	Match Status
Voltage - Zener (Nom)	25 V	25 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	225 mW	350 mW	Substitute Rated Higher
Impedance (Max)	35 Ohms	35 Ohms	Equivalent
Current - Reverse Leakage @ Vr	100 nA @ 19 V	100 nA @ 19 V	Equivalent
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	Equivalent
Operating Temperature Range	-55°C to 150°C	-65°C to 150°C	Substitute Range Extended
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
RoHS Status	RoHS Non-Compliant	ROHS3 Compliant	Substitute Compliant
Product Status	Obsolete	Active	Substitute Active

Engineering Selection Recommendations

The CMPZ5253B TR PBFREE is a direct functional substitute for the MMBZ5253BLT1. Selection of this substitute part is supported by the following factors:

Electrical Compatibility: All critical electrical parameters match the original specification. The zener voltage, tolerance, impedance, reverse leakage current, and forward voltage are identical across both components.

Mechanical Compatibility: Both parts utilize the SOT-23-3 package with identical pinout and surface mount configuration, enabling direct board-level substitution without layout modification.

Enhanced Thermal Performance: The CMPZ5253B TR PBFREE provides 350 mW maximum power dissipation compared to 225 mW for the original part, offering improved thermal margin in the same package footprint.

Regulatory Compliance: The substitute part is ROHS3 compliant and carries active product status, addressing the obsolescence of the original MMBZ5253BLT1 while meeting current regulatory requirements.

Extended Temperature Range: The substitute operates from -65°C to 150°C, providing an expanded lower temperature operating boundary compared to the original -55°C to 150°C specification.

Frequently Asked Questions (FAQ)

Q: Can the CMPZ5253B TR PBFREE be used as a direct replacement for MMBZ5253BLT1 in existing designs?

A: Yes. The CMPZ5253B TR PBFREE is electrically and mechanically equivalent to the MMBZ5253BLT1. Identical zener voltage, tolerance, impedance, leakage current, and forward voltage specifications enable direct substitution. The SOT-23-3 package pinout is identical, requiring no circuit or layout modifications.

Q: What is the significance of the higher power rating on the substitute part?

A: The CMPZ5253B TR PBFREE is rated at 350 mW maximum power dissipation versus 225 mW for the original part. This higher rating provides additional thermal headroom and allows the component to dissipate greater power levels within the same physical package without exceeding maximum junction temperature limits.

Q: Are there packaging differences between the two parts?

A: Both parts are supplied in SOT-23-3 (TO-236-3, SC-59) surface mount packages. The MMBZ5253BLT1 is supplied in standard packaging, while the CMPZ5253B TR PBFREE is supplied in Tape & Reel (TR) format. The physical package dimensions and pinout are identical; the difference is in the delivery format for automated assembly processes.

Q: Does the extended temperature range of the substitute part affect compatibility?

A: No. The CMPZ5253B TR PBFREE operates from -65°C to 150°C, which encompasses the original part's -55°C to 150°C range. The extended lower temperature boundary provides additional operational margin and does not introduce compatibility issues.

Q: What is the compliance status difference between the two parts?

A: The MMBZ5253BLT1 is RoHS non-compliant and obsolete. The CMPZ5253B TR PBFREE is ROHS3 compliant and carries active product status, meeting current regulatory requirements and ensuring long-term availability for procurement.

Q: Are the electrical characteristics identical between the two parts?

A: Yes. Both parts share identical specifications for zener voltage (25 V), tolerance (±5%), impedance (35 Ohms maximum), reverse leakage current (100 nA @ 19 V), and forward voltage (900 mV @ 10 mA). These parameters determine functional equivalence in circuit operation.

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