MMSZ11T1 Equivalent & Substitute Parts

Part Overview

The MMSZ11T1 is an 11 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. Active equivalent and substitute parts are available from multiple manufacturers with comparable or enhanced specifications.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	11 V
Power - Max	500 mW
Tolerance	±5%
Impedance (Max)	20 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 8 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MMSZ11T1 is determined by the following critical parameters: nominal Zener voltage (11 V), voltage tolerance (±5%), maximum power dissipation capability, impedance characteristics, reverse leakage current specifications, forward voltage characteristics, operating temperature range, and package type (SOD-123 or compatible variants).

Substitute parts are grouped into three categories:

Direct Equivalent (Parametric Match): Parts with identical electrical specifications and active product status, differing only in packaging format or manufacturer designation.

Similar Equivalent (Reduced Power Rating): Parts with matching Zener voltage, tolerance, and temperature range but reduced maximum power dissipation (410 mW versus 500 mW), suitable for applications with lower power requirements.

Alternative Equivalent (Different Package): Parts with matching Zener voltage and tolerance but different package types (SOD-123F, SOD-523) or impedance characteristics, applicable when package constraints permit substitution.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Status	RoHS
MMSZ11T1	onsemi	11 V	500 mW	±5%	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Obsolete	Non-compliant
MMSZ11T1G	onsemi	11 V	500 mW	±5%	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
SZMMSZ11T1G	onsemi	11 V	500 mW	±5%	20 Ω	100 nA @ 8 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52C11-E3-08	Vishay	11 V	410 mW	±5%	20 Ω	100 nA @ 8.5 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52C11-E3-18	Vishay	11 V	410 mW	±5%	20 Ω	100 nA @ 8.5 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52C11-G3-08	Vishay	11 V	410 mW	±5%	20 Ω	100 nA @ 8.5 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52C11-G3-18	Vishay	11 V	410 mW	±5%	20 Ω	100 nA @ 8.5 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52H-C11,115	Nexperia	11 V	375 mW	±5%	10 Ω	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	SOD-123F	Active	ROHS3 Compliant
CMHZ5241B BK PBFREE	Central Semiconductor	11 V	500 mW	±5%	22 Ω	2 µA @ 8.4 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
CMHZ5241B TR PBFREE	Central Semiconductor	11 V	500 mW	±5%	22 Ω	2 µA @ 8.4 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
DDZ9698T-7	Diodes Incorporated	11 V	150 mW	±5%	Not specified	50 nA @ 8.4 V	900 mV @ 10 mA	-65°C ~ 150°C	SOD-523	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

MMSZ11T1G (onsemi) and SZMMSZ11T1G (onsemi) are direct parametric equivalents with identical electrical specifications. Both are active products with ROHS3 compliance. MMSZ11T1G is available in Cut Tape and Digi-Reel packaging (3730 pcs inventory), while SZMMSZ11T1G is available in Tape & Reel format with AEC-Q101 automotive qualification (6400 pcs inventory). Selection between these two depends on packaging requirements and automotive qualification necessity.

Secondary Recommendation - Reduced Power Rating:

BZT52C11-E3-08, BZT52C11-E3-18, BZT52C11-G3-08, and BZT52C11-G3-18 (Vishay) provide 410 mW maximum power dissipation with identical Zener voltage, tolerance, impedance, and temperature range. These parts are suitable for applications where the full 500 mW capability is not required. All are active with ROHS3 compliance.

Alternative Recommendation - Different Package:

BZT52H-C11,115 (Nexperia) offers SOD-123F packaging with 375 mW power rating, lower impedance (10 Ω), and extended temperature range (-65°C to 150°C). This part includes AEC-Q101 automotive qualification. Selection is appropriate when package footprint compatibility with SOD-123F exists.

Impedance and Leakage Consideration:

CMHZ5241B variants (Central Semiconductor) match the 500 mW power rating and SOD-123 package but exhibit higher impedance (22 Ω) and reverse leakage current (2 µA @ 8.4 V) compared to the original specification. These parts are suitable only when circuit design accommodates these parameter variations.

Lower Power Alternative:

DDZ9698T-7 (Diodes Incorporated) provides 150 mW power dissipation in SOD-523 package. This part is applicable only for low-power applications where package size reduction is prioritized and power requirements are significantly lower than the original specification.

Frequently Asked Questions (FAQ)

Q: Can MMSZ11T1G directly replace MMSZ11T1 in existing designs?

A: Yes. MMSZ11T1G is a direct parametric equivalent with identical electrical specifications (11 V, 500 mW, ±5%, 20 Ω impedance, -55°C to 150°C). The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant). No circuit modifications are required.

Q: What is the difference between MMSZ11T1G and SZMMSZ11T1G?

A: Both parts are parametrically identical with 11 V, 500 mW specifications. The primary differences are packaging format (MMSZ11T1G: Cut Tape/Digi-Reel; SZMMSZ11T1G: Tape & Reel) and qualification (SZMMSZ11T1G includes AEC-Q101 automotive qualification). Selection depends on packaging requirements and automotive application needs.

Q: Can BZT52C11 series parts replace MMSZ11T1?

A: BZT52C11 series parts (Vishay) are suitable substitutes with matching 11 V Zener voltage, ±5% tolerance, 20 Ω impedance, and -55°C to 150°C temperature range. However, maximum power dissipation is reduced to 410 mW. Substitution is valid only when circuit design accommodates the lower power rating.

Q: What is the significance of the packaging designation (CT, TR, Bulk)?

A: Packaging designations indicate delivery format: Cut Tape (CT) and Digi-Reel are standard reel formats for automated assembly; Tape & Reel (TR) is a larger reel format; Bulk indicates loose components. Selection depends on manufacturing process requirements and assembly equipment compatibility.

Q: Is the BZT52H-C11,115 (SOD-123F package) compatible with SOD-123 footprints?

A: No. SOD-123F and SOD-123 are distinct package types with different physical dimensions and pin configurations. BZT52H-C11,115 requires PCB footprint redesign and is applicable only when SOD-123F package compatibility exists in the design.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. MMSZ11T1 is RoHS non-compliant, while all recommended substitutes are ROHS3 compliant, making them suitable for applications with RoHS compliance requirements.

Q: Can DDZ9698T-7 replace MMSZ11T1 in power-sensitive applications?

A: DDZ9698T-7 is applicable only in applications where maximum power dissipation is 150 mW or lower and SOD-523 package compatibility exists. The significantly reduced power rating and different package make this part unsuitable for general replacement of MMSZ11T1.

Q: What is the impact of impedance variation between substitute parts?

A: Impedance (Zzt) affects dynamic resistance and voltage regulation characteristics. MMSZ11T1 specifies 20 Ω maximum impedance. BZT52H-C11,115 offers lower impedance (10 Ω), providing improved voltage regulation. CMHZ5241B variants specify 22 Ω, slightly higher than the original. Circuit performance may vary with impedance changes in precision voltage regulation applications.

Q: Are all recommended substitutes available in equivalent quantities?

A: Inventory availability varies. SZMMSZ11T1G (6400 pcs) and CMHZ5241B TR PBFREE (12912 pcs) offer highest availability. MMSZ11T1G (3730 pcs) and BZT52C11-E3-08 (29019 pcs) provide substantial stock. Verify current inventory status with suppliers for production requirements.

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