MMBZ5240BW-TP Equivalent & Substitute Parts

Part Overview

The MMBZ5240BW-TP is a Zener diode manufactured by Micro Commercial Co, rated at 10 V nominal with 200 mW maximum power dissipation. This component is designed for interface applications requiring voltage regulation and transient protection in surface mount configurations. The part is currently Active in product status with 1096 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility exist, enabling procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	10	V
Tolerance	±5%	%
Power - Max	200	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 8 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-70, SOT-323	—

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by equivalence across the following critical parameters:

Zener Voltage (Vz): Must match at 10 V nominal with ±5% tolerance
Package Type: Must be SC-70 or SOT-323 surface mount configuration
Impedance (Zzt): Maximum 17 Ohms
Reverse Leakage Current: 3 µA @ 8 V
Forward Voltage (Vf): 900 mV maximum @ 10 mA
Operating Temperature Range: Must support the application's thermal requirements

The CMSZ5240B TR PBFREE meets all electrical specifications for direct substitution. While the maximum power rating differs (275 mW versus 200 mW), this represents an enhancement in thermal capability and does not restrict substitution in applications designed for the 200 mW specification. Both parts share identical package geometry, zener voltage, impedance, leakage current, and forward voltage characteristics.

Parameter Comparison

Parameter	MMBZ5240BW-TP (Main)	CMSZ5240B TR PBFREE (Substitute)	Match Status
Manufacturer	Micro Commercial Co	Central Semiconductor Corp	Different
Voltage - Zener (Nom)	10 V	10 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	200 mW	275 mW	Compatible (Higher Rating)
Impedance (Max)	17 Ohms	17 Ohms	Equivalent
Current - Reverse Leakage @ Vr	3 µA @ 8 V	3 µA @ 8 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	Compatible (Wider Range)
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	SC-70, SOT-323	SC-70, SOT-323	Equivalent
Packaging Format	Bulk	Tape & Reel (TR)	Different
Product Status	Active	Active	Equivalent

Engineering Selection Recommendations

Both the MMBZ5240BW-TP and CMSZ5240B TR PBFREE are Active products suitable for direct substitution in 10 V Zener diode applications. Selection between these parts is based on the following factors:

MMBZ5240BW-TP is appropriate when:

Bulk packaging format is required for manufacturing processes
The 200 mW power rating is the specified design parameter
REACH Unaffected status is a procurement requirement

CMSZ5240B TR PBFREE is appropriate when:

Tape & Reel packaging is required for automated assembly
The extended operating temperature range (-65°C to 150°C) is beneficial
RoHS3 compliance is a system requirement
The higher 275 mW power rating provides additional thermal margin
Moisture Sensitivity Level 1 (Unlimited) is advantageous for storage and handling

Both parts carry REACH Unaffected and EAR99 ECCN classifications, indicating equivalent regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can CMSZ5240B TR PBFREE replace MMBZ5240BW-TP in existing designs?

A: Yes. Both parts share identical zener voltage (10 V), tolerance (±5%), impedance (17 Ohms maximum), reverse leakage current (3 µA @ 8 V), forward voltage (900 mV @ 10 mA), and package geometry (SC-70, SOT-323). The substitute part's higher power rating (275 mW) and wider operating temperature range (-65°C to 150°C) do not restrict compatibility with designs specified for the 200 mW part.

Q: What is the difference between Bulk and Tape & Reel packaging?

A: Bulk packaging contains loose components suitable for manual assembly or small-volume production. Tape & Reel (TR) packaging places components on continuous tape for automated pick-and-place assembly equipment. Both formats contain the same component; packaging selection depends on manufacturing process requirements.

Q: Are there compliance differences between these parts?

A: Both parts are REACH Unaffected and carry EAR99 ECCN classification. The CMSZ5240B TR PBFREE additionally carries RoHS3 compliance certification and specifies Moisture Sensitivity Level 1 (Unlimited), indicating superior moisture handling characteristics during storage and assembly.

Q: Does the higher power rating of the substitute part affect circuit performance?

A: No. The 275 mW rating of CMSZ5240B TR PBFREE represents increased thermal capability compared to the 200 mW specification of MMBZ5240BW-TP. In applications designed for 200 mW operation, the substitute part operates within its specifications and provides additional thermal margin without altering electrical performance.

Q: What determines whether a Zener diode can substitute for another?

A: Substitution is valid when the following parameters match: nominal zener voltage, voltage tolerance, maximum impedance, reverse leakage current, forward voltage characteristics, and package geometry. Operating temperature range and power rating may differ if the substitute provides equal or enhanced capability.

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