MMSZ5232BT1 Equivalent & Substitute Parts

Part Overview

The MMSZ5232BT1 is a Zener diode rated at 5.6 V nominal with 500 mW power dissipation in a surface mount SOD-123 package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.6	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	11	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 3 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—

Substitute Part Grouping Explanation

Substitution of the MMSZ5232BT1 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 5.6 V nominal
Power rating: 500 mW minimum
Impedance: 11 Ohms maximum
Reverse leakage current: 5 µA @ 3 V maximum
Forward voltage: 900 mV @ 10 mA maximum
Operating temperature range: -55°C to 150°C minimum
Package: SOD-123 surface mount

Substitution Categories:

Direct Manufacturer Equivalents maintain all electrical parameters and are manufactured by onsemi. These parts differ only in packaging format (Cut Tape & Digi-Reel® versus bulk) and product status (Active versus Obsolete).

Parametric Equivalents from onsemi and Vishay maintain all critical electrical specifications. Variations include tolerance grades (±2% versus ±5%), packaging formats (Tape & Reel versus Cut Tape), and series designations. Automotive-qualified variants (SZMMSZ5232BT1G) include AEC-Q101 certification.

Similar Parts from alternative manufacturers (NXP Semiconductors, Diodes Incorporated, Micro Commercial Co) meet the core electrical requirements but may exhibit variations in secondary parameters such as impedance, reverse leakage current, or operating temperature range. These parts are suitable for applications where the primary electrical specifications are the controlling factors.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If (mV)	Temp Range (°C)	Package	Status	RoHS
MMSZ5232BT1	onsemi	5.6	±5%	500	11	5 @ 3V	900 @ 10mA	-55 to 150	SOD-123	Obsolete	Non-compliant
MMSZ5232BT1G	onsemi	5.6	±5%	500	11	5 @ 3V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5232CT1G	onsemi	5.6	±2%	500	11	5 @ 3V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3 Compliant
SZMMSZ5232BT1G	onsemi	5.6	±5%	500	11	5 @ 3V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3 Compliant
BZT52H-C5V6,115	NXP Semiconductors	5.6	±5%	375	40	1 @ 2V	900 @ 10mA	-65 to 150	SOD-123F	Active	ROHS3 Compliant
MMSZ5232B-7-F	Diodes Incorporated	5.6	±5%	500	11	5 @ 3V	900 @ 10mA	-65 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5232B-E3-08	Vishay General Semiconductor	5.6	±5%	500	11	5 @ 3V	—	-55 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5232B-E3-18	Vishay General Semiconductor	5.6	±5%	500	11	5 @ 3V	—	-55 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5232B-G3-08	Vishay General Semiconductor	5.6	±5%	500	11	5 @ 3V	—	-55 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5232B-G3-18	Vishay General Semiconductor	5.6	±5%	500	11	5 @ 3V	—	-55 to 150	SOD-123	Active	ROHS3 Compliant
MMSZ5232B-TP	Micro Commercial Co	5.6	±5%	500	11	5 @ 3V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection: MMSZ5232BT1G (onsemi)

The MMSZ5232BT1G is the direct successor to the obsolete MMSZ5232BT1. It maintains identical electrical specifications across all critical parameters while offering Active product status and ROHS3 compliance. This part is the preferred choice for direct replacement in existing designs.

Tighter Tolerance Alternative: MMSZ5232CT1G (onsemi)

For applications requiring improved voltage accuracy, the MMSZ5232CT1G provides ±2% tolerance versus the standard ±5%. All other electrical parameters remain equivalent. This variant is suitable for precision voltage regulation circuits.

Automotive-Qualified Alternative: SZMMSZ5232BT1G (onsemi)

The SZMMSZ5232BT1G is qualified to AEC-Q101 automotive standards and carries the SZMMSZ series designation. Electrical specifications are identical to the MMSZ5232BT1G. This part is required for automotive applications or designs subject to automotive qualification requirements.

Multi-Source Alternatives: Vishay and Diodes Incorporated

The MMSZ5232B-E3-08, MMSZ5232B-G3-08, MMSZ5232B-G3-18 (Vishay) and MMSZ5232B-7-F (Diodes Incorporated) provide equivalent electrical performance with Active status and ROHS3 compliance. These parts differ in packaging format (Tape & Reel versus Cut Tape) and are suitable where supply chain diversification is required.

Extended Temperature Range: MMSZ5232B-7-F (Diodes Incorporated)

This part extends the operating temperature range to -65°C to 150°C, providing additional margin for extreme environment applications while maintaining all other electrical specifications.

Secondary Alternative: BZT52H-C5V6,115 (NXP Semiconductors)

The NXP part meets the core voltage and power specifications but exhibits higher impedance (40 Ohms versus 11 Ohms) and lower reverse leakage current (1 µA @ 2V versus 5 µA @ 3V). This part is suitable for applications where these secondary parameter variations are acceptable. It is qualified to AEC-Q101 and uses the SOD-123F package variant.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5232BT1G be used as a direct replacement for MMSZ5232BT1?

A: Yes. The MMSZ5232BT1G is electrically identical to the obsolete MMSZ5232BT1 across all critical parameters: 5.6 V nominal voltage, ±5% tolerance, 500 mW power rating, 11 Ohms impedance, and SOD-123 package. The primary differences are Active product status and ROHS3 compliance.

Q: What is the difference between MMSZ5232BT1G and MMSZ5232CT1G?

A: Both parts are manufactured by onsemi and share identical electrical specifications except for voltage tolerance. The MMSZ5232BT1G provides ±5% tolerance, while the MMSZ5232CT1G provides tighter ±2% tolerance. Selection depends on circuit accuracy requirements.

Q: When should SZMMSZ5232BT1G be used instead of MMSZ5232BT1G?

A: The SZMMSZ5232BT1G is required for automotive applications or designs subject to automotive qualification standards. It carries AEC-Q101 certification and is electrically equivalent to the MMSZ5232BT1G. Non-automotive applications can use either part.

Q: Are Vishay and Diodes Incorporated parts fully compatible with onsemi parts?

A: Yes, for the specified electrical parameters. The Vishay MMSZ5232B-E3-08, MMSZ5232B-G3-08, MMSZ5232B-G3-18 and Diodes Incorporated MMSZ5232B-7-F maintain identical core specifications: 5.6 V, ±5% tolerance, 500 mW, 11 Ohms impedance, and SOD-123 package. Differences exist only in packaging format (Tape & Reel versus Cut Tape) and minor variations in operating temperature range.

Q: What is the significance of the SOD-123F package used by NXP?

A: The SOD-123F is a variant of the SOD-123 package. While mechanically similar, it may have minor dimensional differences. Verify PCB footprint compatibility before substitution. The NXP part also exhibits different secondary electrical characteristics (40 Ohms impedance versus 11 Ohms, and 1 µA reverse leakage versus 5 µA).

Q: Can BZT52H-C5V6,115 be used in place of MMSZ5232BT1?

A: The NXP part meets the primary voltage specification (5.6 V) and power rating (375 mW is lower than 500 mW but may be sufficient depending on circuit design). However, it exhibits higher impedance (40 Ohms versus 11 Ohms) and lower reverse leakage current (1 µA versus 5 µA). Substitution is possible only if circuit design tolerates these secondary parameter variations. The SOD-123F package requires footprint verification.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. All active substitute parts listed are ROHS3 compliant, while the original MMSZ5232BT1 is non-compliant. For new designs or applications subject to environmental regulations, ROHS3-compliant parts are required.

Q: How do packaging formats (Cut Tape, Tape & Reel, Bulk) affect substitution?

A: Packaging format affects supply chain logistics and handling but does not impact electrical performance or PCB assembly compatibility. All listed parts use the same SOD-123 surface mount package and are compatible with standard pick-and-place assembly equipment. Selection should be based on procurement volume and supplier availability.

Q: Is the MMSZ5232B-TP from Micro Commercial Co a suitable alternative?

A: Yes. The MMSZ5232B-TP maintains all critical electrical specifications identical to the MMSZ5232BT1: 5.6 V, ±5% tolerance, 500 mW, 11 Ohms impedance, SOD-123 package, and -55°C to 150°C operating range. It is Active and ROHS3 compliant, making it suitable for direct substitution.

Q: What factors should determine which substitute part to select?

A: Selection should be based on: (1) Product status (Active parts are preferred over obsolete); (2) Compliance requirements (ROHS3 compliance for regulated applications); (3) Automotive qualification (AEC-Q101 for automotive applications); (4) Supply chain availability; (5) Packaging format requirements; (6) Tolerance requirements (±2% versus ±5%); (7) Operating temperature range requirements; (8) Secondary electrical parameters (impedance, reverse leakage) if circuit design is sensitive to these values.

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