MMBZ5239B-TP Equivalent & Substitute Parts

Part Overview

The MMBZ5239B-TP is an active-status Zener diode manufactured by Micro Commercial Co, rated at 9.1 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, extended temperature range requirements, or alternative sourcing needs while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	9.1	V
Tolerance	±5%	%
Power - Max	350	mW
Impedance (Max)	10	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 7 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution eligibility for the MMBZ5239B-TP is determined by the following critical parameters:

Zener Voltage (Vz): Must be 9.1 V nominal with ±5% tolerance
Package Type: Must be SOT-23 / TO-236-3 / SC-59 surface-mount configuration
Impedance (Zzt): Maximum 10 Ohms
Reverse Leakage Current: 3 µA @ 7 V
Forward Voltage (Vf): 900 mV maximum @ 10 mA
RoHS3 Compliance: Required for regulatory equivalence

The substitute part MMBZ5239BLT1G, manufactured by onsemi, meets all critical electrical parameters and package requirements. The primary difference is reduced maximum power dissipation (225 mW versus 350 mW) and an extended lower operating temperature limit (-65°C versus -55°C). These differences establish application-specific suitability based on thermal and temperature requirements.

Parameter Comparison

Parameter	MMBZ5239B-TP (Micro Commercial Co)	MMBZ5239BLT1G (onsemi)	Compatibility
Voltage - Zener (Nom)	9.1 V	9.1 V	Identical
Tolerance	±5%	±5%	Identical
Power - Max	350 mW	225 mW	Substitute rated lower
Impedance (Max)	10 Ohms	10 Ohms	Identical
Current - Reverse Leakage @ Vr	3 µA @ 7 V	3 µA @ 7 V	Identical
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	Identical
Operating Temperature Range	-55°C to 150°C	-65°C to 150°C	Substitute extends lower limit
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical

Engineering Selection Recommendations

MMBZ5239B-TP (Micro Commercial Co) is selected for applications requiring the full 350 mW power dissipation rating within the -55°C to 150°C operating range. This part maintains active product status and ROHS3 compliance.

MMBZ5239BLT1G (onsemi) is selected for applications where:

Maximum power dissipation does not exceed 225 mW
Extended lower temperature operation to -65°C is required
onsemi sourcing or supply chain continuity is preferred

Both parts are active-status products with ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence. Selection between these parts depends on thermal design requirements and power budget constraints specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5239BLT1G replace MMBZ5239B-TP in all applications?

A: MMBZ5239BLT1G is electrically equivalent for Zener voltage, tolerance, impedance, and leakage characteristics. However, the reduced power rating (225 mW versus 350 mW) requires verification that circuit power dissipation does not exceed 225 mW. The extended lower temperature range (-65°C) is an additional capability with no negative impact on standard applications.

Q: Are the packages physically identical?

A: Both parts use the SOT-23 package (TO-236-3, SC-59). Pin configuration and footprint are identical, enabling direct PCB substitution without layout modification.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance indicates that the actual Zener voltage will fall within the range of 8.645 V to 9.555 V. Both the main part and substitute maintain this tolerance, ensuring equivalent voltage regulation performance.

Q: Are there compliance differences between these parts?

A: Both parts are ROHS3 compliant and REACH unaffected. No compliance differentiation exists between MMBZ5239B-TP and MMBZ5239BLT1G.

Q: How does the impedance specification affect substitution?

A: Impedance (Zzt) of 10 Ohms maximum defines the dynamic resistance of the Zener diode in the breakdown region. Both parts specify identical impedance, ensuring equivalent voltage regulation characteristics and load response behavior.

Q: What is the impact of the extended temperature range in MMBZ5239BLT1G?

A: The onsemi part operates from -65°C (versus -55°C minimum for the Micro Commercial Co part). This extended range provides additional margin for low-temperature applications without affecting performance at standard operating temperatures.

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