MMBZ5232BQ-7-F Equivalent & Substitute Parts

Part Overview

The MMBZ5232BQ-7-F is a Zener diode manufactured by Diodes Incorporated, rated at 5.6 V nominal with 350 mW maximum power dissipation in a surface mount SOT-23-3 package. This component is classified as an automotive-grade device with AEC-Q101 qualification and is actively produced. Substitute parts are identified based on matching electrical specifications, package compatibility, and operational parameters to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.6	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	11	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 3 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the MMBZ5232BQ-7-F are classified into two categories based on electrical parameter alignment:

Direct Substitutes maintain all critical electrical specifications: 5.6 V nominal Zener voltage, ±5% tolerance, 350 mW maximum power, 11 Ohms maximum impedance, 5 µA reverse leakage at 3 V, and 900 mV forward voltage at 10 mA. These parts are interchangeable without circuit redesign.

Similar Substitutes share the 5.6 V nominal Zener voltage and SOT-23-3 package but differ in one or more of the following parameters: power rating (225 mW instead of 350 mW), impedance (40 Ohms instead of 11 Ohms), tolerance (±2% or ±7% instead of ±5%), or reverse leakage characteristics (1 µA at 2 V instead of 5 µA at 3 V). These parts are suitable for applications where the reduced power rating and modified impedance do not exceed circuit requirements.

All substitute parts maintain the same operating temperature range (-65°C to 150°C), surface mount SOT-23-3 package configuration, RoHS3 compliance, and automotive-grade qualification where applicable.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Reverse Leakage	Vf (Max) @ If	Grade	AEC-Q101
MMBZ5232BQ-7-F	Diodes Incorporated	5.6 V	±5%	350 mW	11 Ω	5 µA @ 3 V	900 mV @ 10 mA	Automotive	Yes
CMPZ5232B TR PBFREE	Central Semiconductor Corp	5.6 V	±5%	350 mW	11 Ω	5 µA @ 3 V	900 mV @ 10 mA	—	—
BZX84B5V6LT1G	onsemi	5.6 V	±2%	225 mW	40 Ω	1 µA @ 2 V	900 mV @ 10 mA	—	—
BZX84C5V6 TR PBFREE	Central Semiconductor Corp	5.6 V	±5%	350 mW	40 Ω	1 µA @ 2 V	900 mV @ 10 mA	—	—
BZX84C5V6ET3G	onsemi	5.6 V	±7%	225 mW	40 Ω	1 µA @ 2 V	900 mV @ 10 mA	—	—
SZBZX84B5V6LT1G	onsemi	5.6 V	±2%	225 mW	40 Ω	1 µA @ 2 V	900 mV @ 10 mA	Automotive	Yes
SZBZX84C5V6ET1G	onsemi	5.6 V	±7%	225 mW	40 Ω	1 µA @ 2 V	900 mV @ 10 mA	Automotive	Yes
SZBZX84C5V6ET3G	onsemi	5.6 V	±7%	225 mW	40 Ω	1 µA @ 2 V	900 mV @ 10 mA	Automotive	Yes
SZBZX84C5V6LT3G	onsemi	5.6 V	±7%	225 mW	40 Ω	1 µA @ 2 V	900 mV @ 10 mA	Automotive	Yes
SZMMBZ5232BLT1G	onsemi	5.6 V	±5%	225 mW	11 Ω	5 µA @ 3 V	900 mV @ 10 mA	Automotive	Yes

Engineering Selection Recommendations

Direct Substitution (Electrical Equivalence):

CMPZ5232B TR PBFREE is the only non-automotive direct substitute that matches all electrical parameters of the MMBZ5232BQ-7-F. This part is suitable for applications where automotive qualification is not required. Both parts maintain 350 mW power rating, 11 Ohms impedance, ±5% tolerance, and identical leakage characteristics.

Automotive-Grade Substitution:

SZMMBZ5232BLT1G is an automotive-grade AEC-Q101 qualified alternative that maintains the critical electrical specifications: 5.6 V nominal voltage, ±5% tolerance, 11 Ohms impedance, and 5 µA reverse leakage at 3 V. The power rating is reduced to 225 mW. This part is suitable for automotive applications where the lower power dissipation capacity does not exceed circuit thermal requirements.

Reduced Power Rating Alternatives:

Parts rated at 225 mW maximum power (BZX84B5V6LT1G, BZX84C5V6ET3G, SZBZX84B5V6LT1G, SZBZX84C5V6ET1G, SZBZX84C5V6ET3G, SZBZX84C5V6LT3G) are suitable for applications where continuous power dissipation does not exceed 225 mW. These parts feature 40 Ohms impedance and reduced reverse leakage (1 µA at 2 V). Automotive-grade versions with AEC-Q101 qualification are available from onsemi.

Impedance Variation Consideration:

BZX84C5V6 TR PBFREE maintains the 350 mW power rating and ±5% tolerance but features 40 Ohms impedance instead of 11 Ohms. This part is suitable for applications where impedance variation does not affect circuit performance.

All substitute parts maintain RoHS3 compliance, SOT-23-3 package compatibility, and the -65°C to 150°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can CMPZ5232B TR PBFREE replace MMBZ5232BQ-7-F in automotive applications?

A: CMPZ5232B TR PBFREE matches all electrical specifications but lacks automotive-grade qualification and AEC-Q101 certification. Use only in non-automotive applications. For automotive applications, select SZMMBZ5232BLT1G.

Q: What is the impact of using a 225 mW rated part instead of 350 mW?

A: The 225 mW rating limits continuous power dissipation to this level. Verify that circuit operating conditions do not exceed this power budget. Peak transient conditions may exceed this rating; refer to device datasheets for transient specifications.

Q: How does impedance difference affect circuit performance?

A: Impedance affects dynamic response and noise characteristics. Parts with 40 Ohms impedance (BZX84 series) exhibit different transient behavior than 11 Ohms parts (MMBZ5232 series). Verify impedance compatibility with circuit requirements before substitution.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes, all listed substitute parts are supplied in Tape & Reel (TR) packaging suitable for automated assembly.

Q: Which substitute parts carry automotive qualification?

A: SZBZX84B5V6LT1G, SZBZX84C5V6ET1G, SZBZX84C5V6ET3G, SZBZX84C5V6LT3G, and SZMMBZ5232BLT1G are AEC-Q101 qualified automotive-grade parts.

Q: What tolerance options are available among substitutes?

A: Tolerance options include ±2% (BZX84B5V6LT1G, SZBZX84B5V6LT1G), ±5% (CMPZ5232B TR PBFREE, BZX84C5V6 TR PBFREE, SZMMBZ5232BLT1G), and ±7% (BZX84C5V6ET3G, SZBZX84C5V6ET1G, SZBZX84C5V6ET3G, SZBZX84C5V6LT3G). Select based on circuit voltage regulation requirements.

Q: Is the SOT-23-3 package identical across all substitute parts?

A: Yes, all substitute parts use SOT-23-3 (TO-236-3, SC-59) surface mount package with identical pinout and footprint compatibility.

Q: What is the difference between reverse leakage specifications?

A: MMBZ5232BQ-7-F specifies 5 µA at 3 V, while most substitutes specify 1 µA at 2 V. Lower leakage at lower voltage indicates improved leakage characteristics. Verify leakage requirements for precision applications.

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