MMSZ16T1 Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ16T1 is a 16 V, 500 mW surface mount zener diode in SOD-123 packaging manufactured by onsemi. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. 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)	16 V
Power - Max	500 mW
Tolerance	±5%
Impedance (Max)	40 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 11.2 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MMSZ16T1 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 16 V nominal
Package type: SOD-123 or SOD-123F
Operating temperature range: -55°C to 150°C minimum
Voltage tolerance: ±5% or tighter
Mounting type: Surface Mount

Secondary Compatibility Factors:

Power dissipation: 500 mW or greater
Impedance: 40 Ohms or lower
Reverse leakage current: 50 nA or lower at specified voltage
Forward voltage: 900 mV or lower at 10 mA

Substitute parts are grouped into three categories:

Direct Equivalent: Parts with identical electrical specifications and active product status (MMSZ16T1G, SZMMSZ16T1G).

Similar Substitutes: Parts meeting all primary matching criteria with minor variations in power dissipation, impedance, or reverse leakage current (BZT52 series, BZT52H-C16,115, CMHZ5246B).

Parametric Equivalents: Parts with automotive-grade qualification and AEC-Q101 certification (SZMMSZ16T1G, BZT52C16-HE3-08, BZT52H-C16,115).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Status	RoHS
MMSZ16T1	onsemi	16 V	±5%	500 mW	40 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Obsolete	Non-compliant
MMSZ16T1G	onsemi	16 V	±5%	500 mW	40 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
SZMMSZ16T1G	onsemi	16 V	±5%	500 mW	40 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52C16-E3-08	Vishay	16 V	±5%	410 mW	40 Ω	100 nA @ 12 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52C16-E3-18	Vishay	16 V	±5%	410 mW	40 Ω	100 nA @ 12 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52C16-G3-08	Vishay	16 V	±5%	410 mW	40 Ω	100 nA @ 12 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52C16-G3-18	Vishay	16 V	±5%	410 mW	40 Ω	100 nA @ 12 V	Not specified	-55°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52C16-HE3-08	Vishay	16 V	±5%	410 mW	40 Ω	100 nA @ 12 V	Not specified	-55°C ~ 150°C	SOD-123	Obsolete	ROHS3 Compliant
BZT52C16-TP	Micro Commercial Co	16 V	±6%	500 mW	40 Ω	100 nA @ 11.2 V	900 mV @ 10 mA	-65°C ~ 150°C	SOD-123	Active	ROHS3 Compliant
BZT52H-C16,115	Nexperia USA Inc.	16 V	±5%	375 mW	20 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-65°C ~ 150°C	SOD-123F	Active	ROHS3 Compliant
CMHZ5246B TR PBFREE	Central Semiconductor Corp	16 V	±5%	500 mW	17 Ω	100 nA @ 12 V	900 mV @ 10 mA	-65°C ~ 150°C	SOD-123	Active	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Direct Replacements:

MMSZ16T1G is the primary recommended substitute. This part is manufactured by onsemi, the original manufacturer of the MMSZ16T1, and provides identical electrical specifications with active product status and ROHS3 compliance. The part is available in Tape & Reel packaging.

SZMMSZ16T1G is an automotive-grade equivalent with AEC-Q101 qualification. This part maintains all electrical parameters of the original MMSZ16T1 and is suitable for applications requiring automotive-level reliability and compliance. Product status is active with ROHS3 compliance.

Alternative Substitutes for Non-Critical Applications:

BZT52C16-TP (Micro Commercial Co) provides 500 mW power dissipation matching the original part. Tolerance is ±6% versus ±5% on the original. Operating temperature range extends to -65°C. This part is active and ROHS3 compliant.

CMHZ5246B TR PBFREE (Central Semiconductor Corp) offers 500 mW power dissipation with improved impedance characteristics (17 Ω versus 40 Ω). Operating temperature range extends to -65°C. Product status is active with ROHS3 compliance.

Lower Power Alternatives:

BZT52 series parts (E3-08, E3-18, G3-08, G3-18 variants) from Vishay provide 410 mW power dissipation. These parts are suitable for applications where the full 500 mW capability is not required. All variants are active and ROHS3 compliant.

BZT52H-C16,115 (Nexperia USA Inc.) offers 375 mW power dissipation in SOD-123F packaging with AEC-Q101 automotive qualification. This part features lower impedance (20 Ω) and extended temperature range to -65°C.

Obsolete Parts to Avoid:

BZT52C16-HE3-08 is classified as obsolete and should not be selected for new designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can MMSZ16T1G be used as a direct replacement for MMSZ16T1?

A: Yes. MMSZ16T1G is a direct equivalent with identical electrical specifications, same SOD-123 package, and equivalent operating temperature range. The primary difference is active product status and ROHS3 compliance versus the obsolete, non-compliant status of the original part.

Q: What is the difference between MMSZ16T1G and SZMMSZ16T1G?

A: Both parts have identical electrical specifications and packaging. SZMMSZ16T1G includes automotive-grade qualification and AEC-Q101 certification, making it suitable for automotive applications requiring higher reliability standards. Both are active and ROHS3 compliant.

Q: Can BZT52C16 series parts replace MMSZ16T1?

A: BZT52C16 series parts meet the 16 V zener voltage, ±5% tolerance, and SOD-123 package requirements. However, power dissipation is reduced to 410 mW versus 500 mW on the original part. These parts are suitable for applications where 410 mW power handling is sufficient. All BZT52C16 variants are active and ROHS3 compliant.

Q: What is the significance of the SOD-123F package used in BZT52H-C16,115?

A: SOD-123F is a variant of the SOD-123 package with different mechanical dimensions. While electrically compatible, physical board layout and footprint must be verified before substitution. BZT52H-C16,115 is not a direct mechanical replacement without PCB redesign.

Q: Are there any compliance differences between substitute parts?

A: All active substitute parts listed are ROHS3 compliant. The original MMSZ16T1 is RoHS non-compliant. SZMMSZ16T1G and BZT52C16-HE3-08 include AEC-Q101 automotive qualification, while other substitutes do not carry this certification.

Q: Which substitute part has the lowest impedance?

A: CMHZ5246B TR PBFREE has the lowest impedance at 17 Ω, compared to 40 Ω on the original MMSZ16T1 and most substitutes. BZT52H-C16,115 has 20 Ω impedance. Lower impedance provides better voltage regulation characteristics.

Q: Can BZT52C16-TP be used in applications requiring -55°C minimum temperature?

A: BZT52C16-TP has an operating temperature range of -65°C to 150°C, which exceeds the -55°C to 150°C range of the original MMSZ16T1. This part is suitable for applications requiring -55°C minimum temperature operation.

Q: What is the impact of ±6% tolerance on BZT52C16-TP versus ±5% on MMSZ16T1?

A: BZT52C16-TP has ±6% voltage tolerance compared to ±5% on the original part. This represents a 20% wider tolerance band. Applications with tight voltage regulation requirements should use parts with ±5% tolerance such as MMSZ16T1G, SZMMSZ16T1G, or BZT52 series variants.

Q: Are packaging variants (Tape & Reel, Cut Tape, Digi-Reel) electrically equivalent?

A: Yes. Packaging variants represent different delivery and handling formats only. Electrical specifications remain identical across packaging options. Selection should be based on manufacturing process requirements and supply chain considerations.

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