MMBZ5254B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMBZ5254B-TP is a 27 V, 350 mW surface mount zener diode manufactured by Micro Commercial Co, supplied in Tape & Reel packaging with SOT-23 package configuration. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility exist within the zener diode category, enabling direct replacement in circuit applications where the primary part becomes unavailable or when alternative sourcing is required.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Power - Maximum	350	mW
Tolerance	±5%	—
Impedance (Maximum)	41	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 21 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of zener diodes is determined by equivalence in the following critical parameters: nominal zener voltage (Vz), maximum power dissipation rating (P-Max), voltage tolerance, package type, and mounting configuration. All identified substitute parts maintain the 27 V nominal zener voltage specification and SOT-23 surface mount package, ensuring mechanical and electrical compatibility.

The MMBZ5254B-TP substitutes are categorized as follows:

Upgrade Substitute: CMPZ5254B TR PBFREE maintains identical electrical specifications (27 V, 350 mW, ±5% tolerance) with extended lower operating temperature range (-65°C vs. -55°C) and lead-free construction.

Similar Substitutes: BZX84C27-E3-08 and BZX84C27-7-F both maintain 27 V nominal zener voltage and SOT-23 package compatibility. These parts operate at reduced maximum power (300 mW vs. 350 mW) and exhibit variations in tolerance and impedance characteristics.

Parameter Comparison

Parameter	MMBZ5254B-TP	CMPZ5254B TR PBFREE	BZX84C27-E3-08	BZX84C27-7-F
Manufacturer	Micro Commercial Co	Central Semiconductor Corp	Vishay General Semiconductor	Diodes Incorporated
Voltage - Zener (Nom)	27 V	27 V	27 V	27 V
Tolerance	±5%	±5%	±5%	±7%
Power - Max	350 mW	350 mW	300 mW	300 mW
Impedance (Max)	41 Ohms	41 Ohms	80 Ohms	80 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 21 V	100 nA @ 21 V	50 nA @ 18.9 V	100 nA @ 18.9 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-55 to 150°C	-65 to 150°C	-55 to 150°C	-65 to 150°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

CMPZ5254B TR PBFREE is the primary upgrade substitute for MMBZ5254B-TP. This part maintains identical electrical specifications (27 V, 350 mW, ±5% tolerance, 41 Ohms impedance) and package configuration. The extended lower operating temperature range (-65°C minimum vs. -55°C) provides enhanced thermal margin for applications requiring operation at lower ambient temperatures. Both parts are Active status, RoHS3 compliant, and REACH unaffected, ensuring regulatory equivalence.

BZX84C27-E3-08 (Vishay) and BZX84C27-7-F (Diodes Incorporated) are classified as similar substitutes due to reduced maximum power rating (300 mW vs. 350 mW) and increased impedance (80 Ohms vs. 41 Ohms). These parts maintain 27 V nominal zener voltage and SOT-23 package compatibility. BZX84C27-E3-08 retains ±5% tolerance matching the primary part, while BZX84C27-7-F operates at ±7% tolerance. Both parts are Active status and fully compliant with RoHS3 and REACH requirements. Selection of these similar substitutes is appropriate for applications where the 300 mW power rating is sufficient and the higher impedance characteristic is acceptable.

Frequently Asked Questions (FAQ)

Q: Can CMPZ5254B TR PBFREE directly replace MMBZ5254B-TP in all applications?

A: Yes. CMPZ5254B TR PBFREE maintains identical nominal zener voltage (27 V), maximum power dissipation (350 mW), voltage tolerance (±5%), impedance (41 Ohms), and package configuration (SOT-23). The extended lower operating temperature range (-65°C vs. -55°C) provides additional thermal capability without limiting functionality in standard applications.

Q: What are the key differences between MMBZ5254B-TP and the BZX84C27 series substitutes?

A: The primary differences are maximum power rating and impedance. MMBZ5254B-TP is rated for 350 mW with 41 Ohms impedance, while BZX84C27-E3-08 and BZX84C27-7-F are rated for 300 mW with 80 Ohms impedance. Both BZX84 parts maintain 27 V nominal zener voltage and SOT-23 package compatibility. BZX84C27-7-F operates at ±7% tolerance versus ±5% for the primary part.

Q: Are all substitute parts available in the same package configuration?

A: Yes. All listed substitute parts are supplied in SOT-23 surface mount package (TO-236-3, SC-59, SOT-23-3 designations) with Tape & Reel packaging, ensuring mechanical and assembly compatibility with MMBZ5254B-TP.

Q: Do the substitute parts meet the same regulatory compliance standards?

A: Yes. All substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of MMBZ5254B-TP. All parts are classified as Active product status.

Q: When should BZX84C27 series parts be selected over CMPZ5254B TR PBFREE?

A: BZX84C27 series parts are appropriate for applications where the 300 mW power rating is sufficient and the higher impedance (80 Ohms) is acceptable. These parts offer extended lower operating temperature range (-65°C) and are available in high inventory quantities. Selection depends on specific circuit power dissipation requirements and impedance tolerance specifications.

Q: What is the significance of the impedance difference between substitute options?

A: Impedance (Zzt) affects the dynamic resistance of the zener diode during operation. MMBZ5254B-TP and CMPZ5254B TR PBFREE both specify 41 Ohms maximum impedance, while BZX84C27 series parts specify 80 Ohms. Lower impedance provides better voltage regulation characteristics under varying load conditions. Applications requiring tighter voltage regulation should prioritize parts with lower impedance specifications.

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