MMBZ5232BLT3 Equivalent & Substitute Parts

Part Overview

The MMBZ5232BLT3 is a Zener diode rated at 5.6 V nominal with 225 mW maximum power dissipation in a surface mount SOT-23-3 package. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, identifying equivalent and substitute parts with active product status is necessary to ensure design continuity and supply chain reliability for new production and ongoing applications.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	5.6 V
Tolerance	±5%
Power - Max	225 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°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MMBZ5232BLT3 are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical electrical specifications across all critical parameters: 5.6 V nominal Zener voltage, ±5% tolerance, 225 mW maximum power, 11 Ohms maximum impedance, 5 µA reverse leakage current at 3 V, and 900 mV forward voltage at 10 mA. These parts differ only in packaging format (Cut Tape, Tape & Reel) or product status (Active vs. Obsolete). Parametric equivalents include MMBZ5232BLT1G, SZMMBZ5232BLT1G, and SZMMBZ5232BLT3G.

Similar Parts share the same 5.6 V nominal Zener voltage and operating temperature range but differ in one or more of the following parameters: maximum power dissipation, impedance, reverse leakage current, or tolerance. These parts are suitable for applications where the increased power rating or modified electrical characteristics do not conflict with circuit requirements. Similar parts include BZX84-A5V6,215, BZX84-C5V6,235, BZX84C5V6-7-F, MMBZ5232B-7-F, MMBZ5232B-TP, MMBZ5232BQ-7-F, and MMBZ5232C-TP.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power - Max	Impedance (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Operating Temp	Product Status	RoHS Status
MMBZ5232BLT3	onsemi	5.6 V	±5%	225 mW	11 Ohms	5 µA @ 3 V	900 mV @ 10 mA	-65°C ~ 150°C	Obsolete	RoHS non-compliant
MMBZ5232BLT1G	onsemi	5.6 V	±5%	225 mW	11 Ohms	5 µA @ 3 V	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3 Compliant
SZMMBZ5232BLT1G	onsemi	5.6 V	±5%	225 mW	11 Ohms	5 µA @ 3 V	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3 Compliant
SZMMBZ5232BLT3G	onsemi	5.6 V	±5%	225 mW	11 Ohms	5 µA @ 3 V	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3 Compliant
BZX84-A5V6,215	Nexperia USA Inc.	5.6 V	±1%	250 mW	40 Ohms	1 µA @ 2 V	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3 Compliant
BZX84-C5V6,235	Nexperia USA Inc.	5.6 V	±5%	250 mW	40 Ohms	1 µA @ 2 V	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3 Compliant
BZX84C5V6-7-F	Diodes Incorporated	5.6 V	±7%	300 mW	40 Ohms	1 µA @ 2 V	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3 Compliant
MMBZ5232B-7-F	Diodes Incorporated	5.6 V	±5%	350 mW	11 Ohms	5 µA @ 3 V	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3 Compliant
MMBZ5232B-TP	Micro Commercial Co	5.6 V	±5%	350 mW	11 Ohms	5 µA @ 3 V	900 mV @ 10 mA	-55°C ~ 150°C	Active	ROHS3 Compliant
MMBZ5232BQ-7-F	Diodes Incorporated	5.6 V	±5%	350 mW	11 Ohms	5 µA @ 3 V	900 mV @ 10 mA	-65°C ~ 150°C	Active	ROHS3 Compliant
MMBZ5232C-TP	Micro Commercial Co	5.6 V	±1.96%	350 mW	11 Ohms	5 µA @ 3 V	900 mV @ 10 mA	-55°C ~ 150°C	Active	Not specified

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

MMBZ5232BLT1G, SZMMBZ5232BLT1G, and SZMMBZ5232BLT3G are parametric equivalents with identical electrical specifications to the MMBZ5232BLT3. All three are manufactured by onsemi with active product status and ROHS3 compliance. SZMMBZ5232BLT1G and SZMMBZ5232BLT3G carry AEC-Q101 automotive qualification, making them suitable for automotive applications. Selection between these three should be based on packaging format availability and supply chain requirements.

For Applications Requiring Higher Power Dissipation:

MMBZ5232B-7-F (Diodes Incorporated), MMBZ5232B-TP (Micro Commercial Co), and MMBZ5232BQ-7-F (Diodes Incorporated) provide 350 mW maximum power dissipation while maintaining the same 5.6 V nominal voltage, ±5% tolerance, 11 Ohms impedance, and reverse leakage characteristics. MMBZ5232BQ-7-F includes AEC-Q101 automotive qualification. These parts are suitable for circuits where the original 225 mW rating is insufficient.

For Applications Accepting Modified Electrical Characteristics:

BZX84-C5V6,235 (Nexperia) maintains ±5% tolerance and 5.6 V nominal voltage with increased 250 mW power rating and includes AEC-Q101 automotive qualification. BZX84-A5V6,215 (Nexperia) offers tighter ±1% tolerance with 250 mW power and automotive qualification. BZX84C5V6-7-F (Diodes Incorporated) provides 300 mW power with ±7% tolerance. These alternatives are acceptable where impedance and reverse leakage variations do not impact circuit performance.

Compliance Considerations:

The original MMBZ5232BLT3 is RoHS non-compliant and obsolete. All recommended parametric equivalents and similar parts are ROHS3 compliant and carry active product status, ensuring regulatory compliance and supply continuity.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5232BLT1G be used as a direct replacement for MMBZ5232BLT3?

A: Yes. MMBZ5232BLT1G is a parametric equivalent with identical electrical specifications: 5.6 V nominal Zener voltage, ±5% tolerance, 225 mW maximum power, 11 Ohms impedance, and 5 µA reverse leakage at 3 V. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Both are manufactured by onsemi in SOT-23-3 packaging.

Q: What is the difference between MMBZ5232BLT1G and SZMMBZ5232BLT1G?

A: Both parts are parametric equivalents with identical electrical specifications and onsemi manufacture. SZMMBZ5232BLT1G includes AEC-Q101 automotive qualification, making it suitable for automotive applications. Selection depends on application requirements and packaging format availability (Cut Tape vs. Tape & Reel).

Q: Can I use MMBZ5232B-7-F instead of MMBZ5232BLT3?

A: MMBZ5232B-7-F is a similar part manufactured by Diodes Incorporated with the same 5.6 V nominal voltage and ±5% tolerance but with increased 350 mW maximum power dissipation compared to the original 225 mW. It is suitable for applications where higher power handling is required or beneficial. The impedance and reverse leakage characteristics remain identical at 11 Ohms and 5 µA @ 3 V respectively.

Q: What are the key differences between onsemi and Nexperia Zener diodes in this voltage range?

A: Nexperia BZX84 series parts (BZX84-A5V6,215 and BZX84-C5V6,235) maintain the 5.6 V nominal voltage but feature higher impedance (40 Ohms vs. 11 Ohms), lower reverse leakage (1 µA @ 2 V vs. 5 µA @ 3 V), and increased power ratings (250 mW vs. 225 mW). BZX84-A5V6,215 offers tighter ±1% tolerance. These differences may affect circuit performance in precision applications or high-impedance circuits.

Q: Are automotive-qualified alternatives available?

A: Yes. SZMMBZ5232BLT1G, SZMMBZ5232BLT3G, MMBZ5232BQ-7-F, BZX84-A5V6,215, and BZX84-C5V6,235 all carry AEC-Q101 automotive qualification. SZMMBZ5232BLT1G and SZMMBZ5232BLT3G are parametric equivalents with automotive qualification. MMBZ5232BQ-7-F provides higher power (350 mW) with automotive qualification. Nexperia parts offer automotive qualification with modified electrical characteristics.

Q: What packaging formats are available for equivalent parts?

A: Parametric equivalents are available in Cut Tape (CT) & Digi-Reel® format (MMBZ5232BLT1G) and Tape & Reel (TR) format (SZMMBZ5232BLT1G and SZMMBZ5232BLT3G). Similar parts are available in Tape & Reel and Bulk formats depending on manufacturer. All maintain SOT-23-3 surface mount packaging compatible with the original MMBZ5232BLT3.

Q: Is the operating temperature range a critical factor in part selection?

A: The original MMBZ5232BLT3 operates from -65°C to 150°C. Most equivalent and similar parts maintain this range. MMBZ5232B-TP and MMBZ5232C-TP (Micro Commercial Co) operate from -55°C to 150°C, which is acceptable for most commercial and industrial applications but may not be suitable for extended low-temperature military or aerospace applications requiring -65°C operation.

Q: Can I substitute a higher-power Zener diode in a circuit designed for 225 mW?

A: Yes, in most cases. Higher-power alternatives such as MMBZ5232B-7-F (350 mW) or BZX84-C5V6,235 (250 mW) are backward-compatible in circuits designed for lower power ratings. The circuit will operate safely with the higher-rated component. However, verify that impedance and reverse leakage characteristics do not conflict with circuit requirements, particularly in precision voltage reference or high-impedance applications.

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