MMSZ2V7T1 Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ2V7T1 is a 2.7 V zener diode rated at 500 mW in a surface mount SOD-123 package, manufactured by onsemi. This component is classified as obsolete, indicating that direct procurement from original inventory may be limited. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications requiring 2.7 V zener regulation in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.7	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	100	Ohms
Current - Reverse Leakage @ Vr	20	µA @ 1 V
Voltage - Forward (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 MMSZ2V7T1 is determined by the following critical parameters:

Electrical Parameters (Must Match or Exceed):

Zener voltage: 2.7 V nominal
Voltage tolerance: ±5% or tighter
Power dissipation: minimum 500 mW
Impedance: 100 Ohms maximum
Reverse leakage current: 20 µA @ 1 V maximum
Forward voltage: 900 mV @ 10 mA maximum
Operating temperature range: -55°C to 150°C minimum

Mechanical Parameters (Must Match):

Mounting type: Surface Mount
Package / Case: SOD-123 or compatible variants (SOD-123F acceptable with form factor verification)

Substitute parts are grouped into two categories:

Direct Equivalents: Parts meeting all electrical and mechanical specifications with identical or superior performance characteristics and active product status.

Similar Alternatives: Parts meeting core electrical specifications (2.7 V zener voltage, surface mount SOD-123 family) but with variations in power rating, tolerance, or package variant. These require application-level verification for power budget compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Product Status	RoHS Status	Automotive Grade
MMSZ2V7T1	onsemi	2.7	±5%	500	100	SOD-123	Obsolete	Non-compliant	—
MMSZ2V7T1G	onsemi	2.7	±5%	500	100	SOD-123	Active	ROHS3 Compliant	—
SZMMSZ2V7T1G	onsemi	2.7	±5%	500	100	SOD-123	Active	ROHS3 Compliant	AEC-Q101
SZMMSZ2V7ET1G	onsemi	2.7	±5%	500	100	SOD-123	Active	ROHS3 Compliant	AEC-Q101
BZT52C2V7-TP	Micro Commercial Co	2.7	±7%	200	100	SOD-123	Active	ROHS3 Compliant	—
BZT52H-C2V7,115	Nexperia USA Inc.	2.7	±5%	375	83	SOD-123F	Active	ROHS3 Compliant	AEC-Q101
PZU2.7BA,115	NXP USA Inc.	2.7	±5%	320	100	SOD-323	Active	—	—

Engineering Selection Recommendations

Recommended Direct Substitutes (Identical Electrical and Mechanical Specifications):

MMSZ2V7T1G (onsemi) — Active product status with ROHS3 compliance. Identical electrical specifications and SOD-123 package. Preferred for non-automotive applications requiring direct form-fit-function replacement.
SZMMSZ2V7T1G (onsemi) — Active product status with ROHS3 compliance and AEC-Q101 automotive qualification. Identical electrical specifications and SOD-123 package. Preferred for automotive applications or designs requiring automotive-grade component certification.
SZMMSZ2V7ET1G (onsemi) — Active product status with ROHS3 compliance and AEC-Q101 automotive qualification. Identical electrical specifications and SOD-123 package. Functionally equivalent to SZMMSZ2V7T1G with alternative packaging configuration (Tape & Reel).

Acceptable Similar Alternatives (Electrical Variations Requiring Application Verification):

BZT52H-C2V7,115 (Nexperia USA Inc.) — Active product with AEC-Q101 automotive qualification and ROHS3 compliance. Meets zener voltage and tolerance specifications. Power rating of 375 mW is lower than the 500 mW original specification; suitable only for applications with reduced power dissipation requirements. Package variant SOD-123F requires mechanical compatibility verification.
BZT52C2V7-TP (Micro Commercial Co) — Active product with ROHS3 compliance. Meets zener voltage specification but with ±7% tolerance (versus ±5% original) and reduced 200 mW power rating. Suitable only for low-power applications with relaxed tolerance requirements.
PZU2.7BA,115 (NXP USA Inc.) — Active product with identical zener voltage and tolerance. Power rating of 320 mW is lower than original specification. Package variant SOD-323 differs from SOD-123; mechanical compatibility and PCB layout modifications required.

Frequently Asked Questions (FAQ)

Q: Can MMSZ2V7T1G be used as a direct replacement for MMSZ2V7T1?

A: Yes. MMSZ2V7T1G is a direct equivalent with identical electrical parameters (2.7 V, ±5%, 500 mW, SOD-123) and superior product status (Active vs. Obsolete). ROHS3 compliance provides additional regulatory advantage for new designs.

Q: What is the difference between SZMMSZ2V7T1G and MMSZ2V7T1G?

A: Both parts are electrically identical with matching specifications. SZMMSZ2V7T1G includes AEC-Q101 automotive qualification and is designated for automotive applications. MMSZ2V7T1G is suitable for general industrial and consumer applications. Selection depends on application requirements and automotive compliance mandates.

Q: Why is the power rating important when selecting a substitute?

A: The power rating (500 mW for the original) determines the maximum continuous power dissipation the diode can handle. Substitutes with lower power ratings (such as BZT52C2V7-TP at 200 mW) are only suitable for applications where actual power dissipation remains below the substitute's rating. Exceeding the power rating causes thermal failure and circuit malfunction.

Q: Can BZT52H-C2V7,115 replace MMSZ2V7T1 in all applications?

A: BZT52H-C2V7,115 meets the zener voltage and tolerance requirements but has a lower power rating (375 mW vs. 500 mW) and uses a SOD-123F package variant instead of SOD-123. Substitution is valid only if application power dissipation remains below 375 mW and PCB layout accommodates the SOD-123F package footprint.

Q: What does ±5% tolerance mean for zener voltage?

A: Zener voltage tolerance of ±5% means the actual zener voltage will fall within the range of 2.565 V to 2.835 V (2.7 V ± 5%). Parts with ±7% tolerance have a wider acceptable range. Tighter tolerance specifications provide more precise voltage regulation.

Q: Is ROHS3 compliance required for my application?

A: ROHS3 compliance is mandatory for products sold in the European Union and many other regulated markets. If your application or end-market requires ROHS compliance, select ROHS3-compliant substitutes (MMSZ2V7T1G, SZMMSZ2V7T1G, SZMMSZ2V7ET1G, BZT52H-C2V7,115, or BZT52C2V7-TP). The original MMSZ2V7T1 is non-compliant.

Q: What is AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts bearing this qualification have undergone rigorous testing for reliability, temperature cycling, and performance stability in automotive environments. Select AEC-Q101-qualified parts (SZMMSZ2V7T1G, SZMMSZ2V7ET1G, or BZT52H-C2V7,115) for automotive applications.

Q: Can I use PZU2.7BA,115 as a substitute?

A: PZU2.7BA,115 meets the zener voltage specification but uses a different package (SOD-323 vs. SOD-123). This requires PCB layout modification and mechanical compatibility verification. The 320 mW power rating is also lower than the original 500 mW specification. Substitution is valid only if application power dissipation is below 320 mW and PCB redesign is acceptable.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape suitable for automated pick-and-place assembly equipment. Cut Tape (CT) and Digi-Reel packaging provide smaller quantities on tape segments. Both formats contain identical components; selection depends on production volume and assembly equipment compatibility.

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