MMBZ5240B-TP Equivalent & Substitute Parts

Part Overview

The MMBZ5240B-TP is an active-status Zener diode manufactured by Micro Commercial Co, rated at 10 V nominal with 350 mW maximum power dissipation in a surface-mount SOT-23 package. This component is designed for voltage regulation and protection applications requiring precise Zener voltage characteristics in compact form factors. Substitute parts are identified to address inventory availability, packaging format preferences, or specific thermal operating range requirements while maintaining electrical compatibility within defined parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	10	V
Tolerance	±5%	%
Power - Max	350	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 8 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236)	—

Substitute Part Grouping Explanation

Substitution eligibility for the MMBZ5240B-TP is determined by the following critical parameters:

Zener Voltage (Vz): Must equal 10 V nominal with ±5% tolerance
Package Type: Must be SOT-23-3 (TO-236, SC-59) surface-mount configuration
Impedance (Zzt): Must not exceed 17 Ohms maximum
Reverse Leakage Current: Must not exceed 3 µA @ 8 V
Forward Voltage (Vf): Must not exceed 900 mV @ 10 mA
Compliance Status: Must maintain ROHS3 and REACH Unaffected certifications

The MMBZ5240BLT1G qualifies as a direct substitute based on matching all critical electrical parameters. Differences in maximum power rating (225 mW vs. 350 mW) and operating temperature range (-65°C to 150°C vs. -55°C to 150°C) do not preclude substitution in applications where the lower power specification is acceptable.

Parameter Comparison

Parameter	MMBZ5240B-TP (Main)	MMBZ5240BLT1G (Substitute)	Match Status
Manufacturer	Micro Commercial Co	onsemi	Different
Voltage - Zener (Nom)	10 V	10 V	Match
Tolerance	±5%	±5%	Match
Power - Max	350 mW	225 mW	Substitute Lower
Impedance (Max)	17 Ohms	17 Ohms	Match
Current - Reverse Leakage @ Vr	3 µA @ 8 V	3 µA @ 8 V	Match
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	Match
Operating Temperature	-55°C to 150°C	-65°C to 150°C	Substitute Extended
Package / Case	SOT-23-3	SOT-23-3	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
REACH Status	REACH Unaffected	REACH Unaffected	Match

Engineering Selection Recommendations

MMBZ5240BLT1G (onsemi) is an active-status equivalent suitable for direct substitution in applications where the following conditions are met:

Circuit power dissipation requirements do not exceed 225 mW continuous operation
Operating environment encompasses the extended lower temperature range (-65°C minimum) or remains within the -55°C to 150°C specification
Packaging format acceptance includes Cut Tape (CT) and Digi-Reel® delivery options
Both components maintain identical ROHS3 and REACH compliance certifications

The substitute part carries higher inventory availability (23,400 units) compared to the main part (1,099 units), supporting supply chain continuity. Both components share the same base product number (MMBZ5240) and identical electrical performance in voltage regulation, impedance, and leakage characteristics.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5240BLT1G replace MMBZ5240B-TP in all applications?

A: Substitution is valid when circuit design does not require the full 350 mW power rating. The substitute part is rated for 225 mW maximum. If thermal analysis confirms power dissipation remains below 225 mW, electrical performance is equivalent across all specified parameters.

Q: What is the difference in packaging between these parts?

A: MMBZ5240B-TP is supplied in Tape & Reel (TR) format. MMBZ5240BLT1G is supplied in Cut Tape (CT) and Digi-Reel® format. Both use identical SOT-23-3 (TO-236) surface-mount packages with the same PCB footprint and land pattern requirements.

Q: Are there temperature range implications for substitution?

A: MMBZ5240BLT1G extends the lower operating temperature to -65°C compared to -55°C for the main part. Both maintain 150°C maximum junction temperature. Applications operating above -55°C experience no temperature-related constraints. Applications requiring operation below -55°C benefit from the extended range of the substitute.

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

A: Yes. Both MMBZ5240B-TP and MMBZ5240BLT1G are ROHS3 Compliant and REACH Unaffected. Both carry identical ECCN (EAR99) and HTSUS (8541.10.0050) classifications.

Q: What is the impact of the 125 mW power rating difference?

A: The 125 mW difference (350 mW vs. 225 mW) affects thermal design margins. Applications with calculated power dissipation below 225 mW experience no functional impact. Applications approaching or exceeding 225 mW require the main part or thermal management modifications.

Q: Are the electrical characteristics identical for voltage regulation?

A: Yes. Both parts share identical Zener voltage (10 V ±5%), impedance (17 Ohms max), reverse leakage (3 µA @ 8 V), and forward voltage (900 mV @ 10 mA). Voltage regulation performance is equivalent within specified tolerances.

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