MMSZ6V2T1 Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ6V2T1 is a 6.2 V zener diode rated at 500 mW with ±5% tolerance, manufactured by onsemi in SOD-123 surface mount packaging. This component is classified as obsolete, indicating that the original part number is no longer in active production. Locating equivalent or substitute parts is necessary to support ongoing maintenance, repair, and new design requirements where this zener voltage and power rating are specified.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.2	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	10	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 4 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 MMSZ6V2T1 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 6.2 V nominal
Power dissipation rating: 500 mW or greater
Voltage tolerance: ±5% or tighter
Reverse leakage current: 3 µA @ 4 V or lower
Forward voltage: 900 mV @ 10 mA or lower
Operating temperature range: -55°C to 150°C or wider
Mounting type: Surface Mount
Package compatibility: SOD-123 or equivalent footprint

Parametric Equivalent Parts maintain all electrical specifications and package form factor, enabling direct substitution without circuit redesign.

Similar Parts meet the core zener voltage and functional requirements but differ in one or more secondary parameters such as power rating, tolerance, impedance, or package variant. These parts require engineering evaluation to confirm suitability for the specific application.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance (%)	Power (mW)	Zzt (Ohms)	Leakage @ Vr (µA)	Vf @ If (mV)	Temp Range (°C)	Package	Status
MMSZ6V2T1	onsemi	6.2	±5	500	10	3 @ 4 V	900 @ 10 mA	-55 to 150	SOD-123	Obsolete
MMSZ6V2T1G	onsemi	6.2	±5	500	10	3 @ 4 V	900 @ 10 mA	-55 to 150	SOD-123	Active
SZMMSZ6V2T1G	onsemi	6.2	±5	500	10	3 @ 4 V	900 @ 10 mA	-55 to 150	SOD-123	Active
BZT52C6V2-TP	Micro Commercial Co	6.2	±6	200	10	3 @ 4 V	900 @ 10 mA	-65 to 150	SOD-123	Active
BZT52H-C6V2,115	Nexperia USA Inc.	6.2	±5	375	10	3 @ 4 V	900 @ 10 mA	-65 to 150	SOD-123F	Active
PDZ6.2B,115	Nexperia USA Inc.	6.2	±2	400	50	500 nA @ 3 V	1.1 @ 100 mA	-55 to 150	SOD-323	Active

Engineering Selection Recommendations

Parametric Equivalent - Recommended Primary Substitutes:

MMSZ6V2T1G and SZMMSZ6V2T1G are direct parametric equivalents to the obsolete MMSZ6V2T1. Both parts maintain identical electrical specifications and SOD-123 packaging. MMSZ6V2T1G is the standard commercial-grade equivalent with RoHS3 compliance and active product status. SZMMSZ6V2T1G is the automotive-grade variant, qualified to AEC-Q101 and suitable for applications requiring automotive-level reliability and traceability.

Similar Parts - Application-Dependent Selection:

BZT52C6V2-TP (Micro Commercial Co) provides a 6.2 V zener in SOD-123 packaging with active status and RoHS3 compliance. The power rating is reduced to 200 mW, making this part suitable only for applications where the circuit design permits lower power dissipation. The tolerance is ±6%, which is wider than the original ±5%.

BZT52H-C6V2,115 (Nexperia USA Inc.) offers 6.2 V zener functionality in SOD-123F packaging with 375 mW power rating and AEC-Q101 automotive qualification. The package variant (SOD-123F versus SOD-123) requires verification of PCB footprint compatibility. The power rating of 375 mW falls between the original 500 mW and the BZT52C6V2-TP at 200 mW.

PDZ6.2B,115 (Nexperia USA Inc.) is a 6.2 V zener in SOD-323 packaging with superior tolerance (±2%) and lower impedance characteristics. The SOD-323 package is physically smaller than SOD-123, requiring PCB layout modification. The impedance of 50 Ohms is significantly higher than the 10 Ohms of the original part, affecting circuit performance in applications sensitive to dynamic impedance. This part is suitable for precision applications where tighter tolerance and lower leakage current are beneficial.

Frequently Asked Questions (FAQ)

Q: Can MMSZ6V2T1G be used as a direct replacement for MMSZ6V2T1?

A: Yes. MMSZ6V2T1G is a parametric equivalent with identical electrical specifications, voltage rating, power dissipation, tolerance, and SOD-123 packaging. The primary difference is product status: MMSZ6V2T1G is active production while MMSZ6V2T1 is obsolete. No circuit modifications are required.

Q: What is the difference between MMSZ6V2T1G and SZMMSZ6V2T1G?

A: Both parts are parametric equivalents with identical electrical specifications. SZMMSZ6V2T1G is automotive-grade and carries AEC-Q101 qualification, making it suitable for automotive and high-reliability applications. MMSZ6V2T1G is standard commercial-grade. Selection depends on application requirements and qualification standards.

Q: Can BZT52C6V2-TP replace MMSZ6V2T1 in all applications?

A: BZT52C6V2-TP shares the 6.2 V zener voltage and SOD-123 package, but the power rating is reduced to 200 mW compared to the original 500 mW. This part is suitable only for circuits designed to operate within 200 mW power dissipation limits. Applications requiring the full 500 mW rating cannot use this substitute without circuit redesign.

Q: Why does PDZ6.2B,115 have different impedance and leakage specifications?

A: PDZ6.2B,115 uses a different internal design and SOD-323 package technology. The impedance of 50 Ohms and leakage current of 500 nA reflect the characteristics of this particular device family. These differences affect circuit behavior in applications sensitive to dynamic impedance or requiring ultra-low leakage. Verification is required before substitution.

Q: Is the SOD-123F package compatible with SOD-123 PCB footprints?

A: SOD-123F and SOD-123 are related but distinct package variants. While both are surface mount diodes, the physical dimensions and lead configurations may differ. PCB footprint compatibility must be verified against the specific component datasheets and PCB design files before substitution.

Q: Which substitute part is recommended for new designs?

A: For new designs requiring the 6.2 V, 500 mW zener specification, MMSZ6V2T1G is the recommended choice. It is in active production, RoHS3 compliant, and maintains full parametric equivalence to the original part. For automotive applications, SZMMSZ6V2T1G with AEC-Q101 qualification is the appropriate selection.

Q: Can multiple similar parts be used interchangeably in the same circuit?

A: No. While all listed parts share the 6.2 V nominal zener voltage, differences in power rating, tolerance, impedance, and package type mean they are not interchangeable without circuit analysis. Each substitute must be evaluated individually for the specific application requirements.

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