MMSZ10T3 Equivalent & Substitute Parts

Part Overview

The MMSZ10T3 is a Zener diode manufactured by onsemi, rated at 10 V nominal voltage with 500 mW power dissipation in a surface mount SOD-123 package. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	10	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	20	Ohms
Current - Reverse Leakage @ Vr	200	nA @ 7 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 of the MMSZ10T3 is determined by the following critical parameters: nominal Zener voltage (10 V), power dissipation capability, package type, and operating temperature range. Parts are classified into two categories based on compatibility:

Parametric Equivalents maintain identical or superior electrical specifications across all key parameters, including voltage rating, power rating, impedance, leakage current, and forward voltage characteristics. These parts are direct functional replacements with no circuit redesign required.

Similar Parts share the same nominal Zener voltage (10 V) and forward voltage characteristics but differ in one or more of the following: power dissipation rating, package type (SOD-123F or SOD-323), impedance, tolerance, or operating temperature range. Selection of similar parts requires verification that the reduced power rating or package differences do not compromise circuit performance.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Status
MMSZ10T3	onsemi	10 V	±5%	500 mW	20 Ω	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Obsolete
MMSZ10T1G	onsemi	10 V	±5%	500 mW	20 Ω	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active
SZMMSZ10T1G	onsemi	10 V	±5%	500 mW	20 Ω	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active
SZMMSZ10T3G	onsemi	10 V	±5%	500 mW	20 Ω	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active
BZT52H-C10,115	Nexperia USA Inc.	10 V	±5%	375 mW	10 Ω	900 mV @ 10 mA	-65°C ~ 150°C	SOD-123F	Active
DDZ10C-7	Diodes Incorporated	10 V	±2.5%	310 mW	8 Ω	900 mV @ 10 mA	-65°C ~ 150°C	SOD-123	Active
PDZ10B,115	Nexperia USA Inc.	10 V	±2%	400 mW	10 Ω	1.1 V @ 100 mA	150°C (TJ)	SOD-323	Active
PZU10BA,115	Nexperia USA Inc.	10 V	±5%	320 mW	10 Ω	1.1 V @ 100 mA	-55°C ~ 150°C	SOD-323	Active

Engineering Selection Recommendations

Parametric Equivalent Selection (Direct Replacement)

MMSZ10T1G and SZMMSZ10T3G are parametric equivalents of MMSZ10T3, maintaining identical electrical specifications and SOD-123 package compatibility. Both parts are in active production status with RoHS3 compliance. SZMMSZ10T1G and SZMMSZ10T3G carry automotive-grade qualification (AEC-Q101), suitable for applications requiring automotive-level reliability. MMSZ10T1G is the standard commercial-grade equivalent without automotive qualification. Selection between these three parts depends on application requirements and supply availability.

Similar Part Selection (Application-Dependent)

BZT52H-C10,115 (Nexperia) provides equivalent voltage and tolerance specifications with extended lower operating temperature (-65°C vs. -55°C). Power dissipation is reduced to 375 mW, and package variant is SOD-123F. This part is suitable for applications where the reduced power rating does not exceed circuit requirements and where the package footprint change is acceptable.

DDZ10C-7 (Diodes Incorporated) offers improved tolerance (±2.5% vs. ±5%), lower impedance (8 Ω vs. 20 Ω), and extended lower operating temperature (-65°C). Power dissipation is reduced to 310 mW. This part is suitable for precision voltage regulation applications where tighter tolerance and lower impedance provide performance benefits, provided the reduced power rating is adequate.

PDZ10B,115 and PZU10BA,115 (Nexperia) use SOD-323 package, a smaller form factor than SOD-123. Both parts maintain 10 V nominal voltage. PDZ10B,115 offers 400 mW power dissipation with ±2% tolerance. PZU10BA,115 provides 320 mW power dissipation with ±5% tolerance and extended temperature range (-55°C to 150°C). Package change from SOD-123 to SOD-323 requires PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can MMSZ10T1G directly replace MMSZ10T3 without circuit modification?

A: Yes. MMSZ10T1G is a parametric equivalent with identical voltage rating (10 V), power dissipation (500 mW), impedance (20 Ω), and package (SOD-123). No circuit redesign is required. The primary difference is product status: MMSZ10T1G is active production while MMSZ10T3 is obsolete.

Q: What is the difference between MMSZ10T1G and SZMMSZ10T1G?

A: Both parts are parametric equivalents with identical electrical specifications and SOD-123 packaging. SZMMSZ10T1G carries automotive-grade qualification (AEC-Q101) and is designated for automotive applications. MMSZ10T1G is standard commercial-grade. Selection depends on application requirements and automotive compliance needs.

Q: Can I use BZT52H-C10,115 as a substitute if my circuit requires 500 mW power dissipation?

A: No. BZT52H-C10,115 is rated for 375 mW maximum power dissipation, which is 125 mW less than the MMSZ10T3 specification. Use of this part in a circuit designed for 500 mW operation may result in thermal stress and reduced component reliability. This part is suitable only for applications where actual power dissipation does not exceed 375 mW.

Q: What are the package differences between SOD-123 and SOD-323?

A: SOD-123 and SOD-323 are distinct surface mount packages with different physical dimensions and PCB footprints. SOD-323 is a smaller package. Parts using SOD-323 (PDZ10B,115 and PZU10BA,115) require PCB layout modification and cannot be used as direct drop-in replacements for SOD-123 packages without redesign.

Q: Does DDZ10C-7 offer any performance advantages over MMSZ10T3?

A: DDZ10C-7 provides tighter voltage tolerance (±2.5% vs. ±5%), lower impedance (8 Ω vs. 20 Ω), and extended lower operating temperature (-65°C vs. -55°C). These characteristics improve voltage regulation precision and temperature stability. However, power dissipation is reduced to 310 mW. This part is advantageous for precision applications where the lower power rating is acceptable.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (MMSZ10T1G, SZMMSZ10T1G, SZMMSZ10T3G, BZT52H-C10,115, DDZ10C-7, PDZ10B,115, and PZU10BA,115) are RoHS3 compliant. The original MMSZ10T3 is RoHS non-compliant, making transition to compliant alternatives necessary for new designs and regulatory compliance.

Q: What is the moisture sensitivity level (MSL) for all these parts?

A: All parts, including MMSZ10T3 and all substitutes, have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.

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