MMSZ15T1 Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ15T1 is a 15 V, 500 mW Zener diode manufactured by onsemi in SOD-123 surface mount packaging. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part operates across a temperature range of -55°C to 150°C with ±5% voltage tolerance and is RoHS non-compliant.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	15 V
Power - Max	500 mW
Tolerance	±5%
Impedance (Max)	30 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 10.5 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C
Package / Case	SOD-123
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MMSZ15T1 is determined by the following critical parameters: nominal Zener voltage (15 V), maximum power dissipation capability, voltage tolerance, impedance characteristics, reverse leakage current, forward voltage drop, operating temperature range, and package type (SOD-123 surface mount).

Substitute parts are grouped into two categories:

Direct Equivalents maintain all electrical parameters and differ only in product status (active vs. obsolete) or packaging format (Cut Tape vs. Tape & Reel). These parts are interchangeable without circuit redesign.

Parametric Equivalents maintain the core electrical specifications (15 V nominal, ±5% tolerance, 50 nA reverse leakage, 900 mV forward voltage) but may include automotive-grade qualification (AEC-Q101) and differ in packaging configuration. These are functionally equivalent for standard applications.

Similar Parts share the same nominal voltage and package type but differ in power rating, voltage tolerance, or impedance characteristics. These require application-level evaluation to confirm suitability.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Status	RoHS
MMSZ15T1	onsemi	15 V	500 mW	±5%	30 Ω	50 nA @ 10.5 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Obsolete	Non-compliant
MMSZ15T1G	onsemi	15 V	500 mW	±5%	30 Ω	50 nA @ 10.5 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
SZMMSZ15ET1G	onsemi	15 V	500 mW	±5%	30 Ω	50 nA @ 10.5 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
SZMMSZ15T1G	onsemi	15 V	500 mW	±5%	30 Ω	50 nA @ 10.5 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52C15-TP	Micro Commercial Co	15 V	200 mW	±6%	30 Ω	100 nA @ 10.5 V	900 mV @ 10 mA	-65°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52H-C15,115	Nexperia USA Inc.	15 V	375 mW	±5%	15 Ω	50 nA @ 10.5 V	900 mV @ 10 mA	-65°C ~ 150°C	SOD-123F	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MMSZ15T1G

The MMSZ15T1G is the direct successor to the obsolete MMSZ15T1. It maintains identical electrical specifications across all parameters while offering active product status and ROHS3 compliance. This part is available in Cut Tape and Digi-Reel packaging formats and represents the most straightforward replacement path.

Secondary Recommendations: SZMMSZ15ET1G and SZMMSZ15T1G

Both SZMMSZ15 variants are parametric equivalents with identical electrical performance to the MMSZ15T1. These parts include automotive-grade qualification (AEC-Q101) and are supplied in Tape & Reel packaging. Selection between these variants depends on packaging requirements and automotive application needs. Both are ROHS3 compliant and active products.

Alternative Consideration: BZT52H-C15,115

The BZT52H-C15,115 from Nexperia is an active, ROHS3-compliant alternative with 15 V nominal voltage and ±5% tolerance. This part differs in power rating (375 mW vs. 500 mW), impedance (15 Ω vs. 30 Ω), and package variant (SOD-123F vs. SOD-123). It includes automotive qualification (AEC-Q101) and operates across -65°C to 150°C. This part is suitable for applications where the lower power dissipation is acceptable.

Limited Suitability: BZT52C15-TP

The BZT52C15-TP from Micro Commercial Co shares the 15 V nominal voltage but differs significantly in power rating (200 mW vs. 500 mW) and voltage tolerance (±6% vs. ±5%). This part is suitable only for applications with reduced power requirements and can tolerate wider voltage tolerance.

Frequently Asked Questions (FAQ)

Q: Can MMSZ15T1G be used as a direct replacement for MMSZ15T1?

A: Yes. The MMSZ15T1G maintains identical electrical specifications including 15 V nominal voltage, 500 mW power rating, ±5% tolerance, 30 Ω impedance, and -55°C to 150°C operating range. The primary differences are active product status and ROHS3 compliance.

Q: What is the difference between MMSZ15T1G and SZMMSZ15T1G?

A: Both parts are electrically identical with 15 V nominal voltage, 500 mW power rating, and ±5% tolerance. The SZMMSZ15T1G includes automotive-grade qualification (AEC-Q101) and is supplied in Tape & Reel packaging, while MMSZ15T1G is available in Cut Tape and Digi-Reel formats. Selection depends on packaging requirements and automotive application needs.

Q: Is BZT52H-C15,115 a suitable replacement?

A: The BZT52H-C15,115 is functionally equivalent for voltage regulation at 15 V but differs in power dissipation capability (375 mW vs. 500 mW) and impedance (15 Ω vs. 30 Ω). It is suitable for applications where the lower power rating is acceptable. The part includes automotive qualification and operates across a wider temperature range (-65°C to 150°C).

Q: Why does BZT52C15-TP have lower power rating?

A: The BZT52C15-TP is designed for lower-power applications. With 200 mW maximum power dissipation compared to 500 mW in the MMSZ15T1, this part is suitable only for circuits with reduced power requirements. Additionally, it specifies ±6% voltage tolerance versus ±5% for the original part.

Q: What packaging options are available?

A: The MMSZ15T1G is available in Cut Tape (CT) and Digi-Reel packaging. The SZMMSZ15ET1G and SZMMSZ15T1G are supplied in Tape & Reel (TR) format. The BZT52H-C15,115 is also available in Cut Tape and Digi-Reel. The BZT52C15-TP is supplied in Tape & Reel. Selection depends on assembly equipment and production volume requirements.

Q: Are all substitute parts ROHS3 compliant?

A: The MMSZ15T1 is RoHS non-compliant. All recommended substitutes (MMSZ15T1G, SZMMSZ15ET1G, SZMMSZ15T1G, BZT52H-C15,115, and BZT52C15-TP) are ROHS3 compliant, meeting current regulatory requirements.

Q: Which part should be selected for automotive applications?

A: For automotive applications, SZMMSZ15ET1G, SZMMSZ15T1G, and BZT52H-C15,115 all include AEC-Q101 qualification. The SZMMSZ15 variants maintain the full 500 mW power rating, while BZT52H-C15,115 provides 375 mW with improved impedance characteristics (15 Ω).

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