MMSZ56T1 Equivalent & Substitute Parts

Part Overview

The MMSZ56T1 is a Zener diode rated at 56 V nominal voltage with 500 mW power dissipation in a surface mount SOD-123 package. This component is classified as obsolete, indicating that direct procurement from original inventory may be limited. Equivalent and substitute parts are necessary to ensure design continuity and maintain supply chain reliability for applications requiring 56 V Zener diode functionality.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	56 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	200 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 39.2 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123

Substitute Part Grouping Explanation

Substitution for the MMSZ56T1 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 56 V nominal
Tolerance: ±5%
Reverse leakage current: 50 nA @ 39.2 V
Forward voltage: 900 mV @ 10 mA
Operating temperature range: -55°C to 150°C minimum
Surface mount configuration

Direct Equivalents maintain all electrical parameters and package specifications. These parts are functionally interchangeable with the MMSZ56T1.

Parametric Equivalents meet all core electrical specifications but may include additional qualifications (such as automotive grade certifications) or packaging variations (Tape & Reel). These parts satisfy the functional requirements of the original design.

Similar Parts share the same Zener voltage and tolerance but differ in power rating or package variant. These parts are suitable for applications where the reduced power specification or alternative package does not conflict with design requirements.

Parameter Comparison

Parameter	MMSZ56T1	MMSZ56T1G	SZMMSZ56T1G	BZT52H-C56,115
Manufacturer	onsemi	onsemi	onsemi	Nexperia USA Inc.
Voltage - Zener (Nom) (Vz)	56 V	56 V	56 V	56 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	375 mW
Impedance (Max) (Zzt)	200 Ohms	200 Ohms	200 Ohms	120 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 39.2 V	50 nA @ 39.2 V	50 nA @ 39.2 V	50 nA @ 39.2 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C
Package / Case	SOD-123	SOD-123	SOD-123	SOD-123F
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	No	No	Yes (AEC-Q101)	Yes (AEC-Q101)

Engineering Selection Recommendations

MMSZ56T1G (onsemi) is the primary direct equivalent. This part maintains identical electrical specifications and SOD-123 packaging while offering active product status and ROHS3 compliance. Selection of MMSZ56T1G is appropriate for standard industrial applications requiring direct replacement of the obsolete MMSZ56T1.

SZMMSZ56T1G (onsemi) is a parametric equivalent with automotive-grade qualification (AEC-Q101) and ROHS3 compliance. This part is suitable for applications requiring automotive-grade components or enhanced reliability certifications while maintaining all core electrical parameters of the original design.

BZT52H-C56,115 (Nexperia USA Inc.) is a similar part with automotive-grade qualification and AEC-Q101 certification. This part differs in power rating (375 mW versus 500 mW) and impedance specification (120 Ohms versus 200 Ohms). Selection of BZT52H-C56,115 is appropriate only when the reduced power specification and lower impedance are compatible with circuit requirements. The SOD-123F package variant requires verification of PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can MMSZ56T1G be used as a direct replacement for MMSZ56T1?

A: Yes. MMSZ56T1G maintains identical Zener voltage (56 V), tolerance (±5%), power rating (500 mW), impedance (200 Ohms), reverse leakage current (50 nA @ 39.2 V), forward voltage (900 mV @ 10 mA), operating temperature range (-55°C to 150°C), and SOD-123 package specification. The primary difference is product status (active versus obsolete) and RoHS compliance.

Q: What is the difference between MMSZ56T1G and SZMMSZ56T1G?

A: Both parts share identical electrical specifications and SOD-123 packaging. SZMMSZ56T1G includes automotive-grade qualification (AEC-Q101) and is designated for automotive applications. Selection between these parts depends on whether automotive-grade certification is required for the application.

Q: Can BZT52H-C56,115 replace MMSZ56T1 in all applications?

A: BZT52H-C56,115 shares the same Zener voltage (56 V), tolerance (±5%), reverse leakage current (50 nA @ 39.2 V), and forward voltage (900 mV @ 10 mA). However, it differs in power rating (375 mW versus 500 mW) and impedance (120 Ohms versus 200 Ohms). Substitution is valid only when the circuit design accommodates the reduced power dissipation and lower impedance. The SOD-123F package requires PCB footprint verification.

Q: What does the SOD-123F package variant mean?

A: SOD-123F is a variant of the SOD-123 surface mount package. While both are surface mount configurations, the "F" designation indicates a specific package variant. PCB footprint compatibility must be verified before substitution.

Q: Are all substitute parts RoHS compliant?

A: MMSZ56T1G, SZMMSZ56T1G, and BZT52H-C56,115 are all ROHS3 compliant. The original MMSZ56T1 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the three substitute parts satisfy this criterion.

Q: Which substitute part should be selected for automotive applications?

A: SZMMSZ56T1G and BZT52H-C56,115 both carry automotive-grade qualification (AEC-Q101). Selection between these two depends on whether the reduced power rating (375 mW) and lower impedance (120 Ohms) of BZT52H-C56,115 are acceptable for the specific circuit design.

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