MM3Z27VT3G Equivalent & Substitute Parts

Part Overview

The MM3Z27VT3G is an active-status Zener diode manufactured by onsemi, rated for 27 V nominal Zener voltage with 300 mW maximum power dissipation in a surface mount SOD-323 package. This component is designed for voltage regulation and protection applications requiring precise voltage reference characteristics. Substitute parts are identified based on matching electrical specifications, package compatibility, and compliance certifications to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	27 V
Tolerance	±5%
Power - Max	300 mW
Impedance (Max) (Zzt)	80 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 18.9 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SC-76, SOD-323
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MM3Z27VT3G are qualified based on the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage: 27 V nominal
Power rating: 300 mW maximum
Impedance: 80 Ohms maximum
Reverse leakage current: 50 nA @ 18.9 V
Operating temperature range: -65°C to 150°C
Package type: SOD-323 surface mount

Compliance Criteria:

RoHS3 compliance
Moisture sensitivity level 1 (unlimited shelf life)
Active product status

Parts meeting these specifications are functionally equivalent and can be substituted in applications where the MM3Z27VT3G is specified. Variations in tolerance (±2% versus ±5%), forward voltage characteristics, and packaging format (tape & reel versus cut tape) do not affect functional substitutability but may influence procurement and assembly considerations.

Parameter Comparison

Parameter	MM3Z27VT3G	MM3Z27VT1G	SZMM3Z27VT1G	BZX384-B27,115	BZX384-C27,115
Manufacturer	onsemi	onsemi	onsemi	Nexperia USA Inc.	NXP Semiconductors
Voltage - Zener (Nom) (Vz)	27 V	27 V	27 V	27 V	27 V
Tolerance	±5%	±5%	±5%	±2%	±5%
Power - Max	300 mW	300 mW	300 mW	300 mW	300 mW
Impedance (Max) (Zzt)	80 Ohms	80 Ohms	80 Ohms	80 Ohms	80 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 18.9 V	50 nA @ 18.9 V	50 nA @ 18.9 V	50 nA @ 18.9 V	50 nA @ 18.9 V
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and full RoHS3 compliance, ensuring long-term availability and regulatory conformance. The following considerations apply to component selection:

onsemi MM3Z27VT1G: Identical electrical specifications to the primary part with tape & reel packaging. Suitable for high-volume production environments requiring automated assembly processes.

onsemi SZMM3Z27VT1G: Meets all electrical specifications with automotive-grade qualification (AEC-Q101) and tape & reel packaging. Appropriate for applications requiring automotive-level reliability and traceability.

Nexperia BZX384-B27,115: Provides tighter tolerance specification (±2% versus ±5%) with identical electrical performance. Cut tape and Digi-Reel packaging format. Forward voltage specification differs at higher current levels (1.1 V @ 100 mA versus 900 mV @ 10 mA).

NXP BZX384-C27,115: Matches tolerance specification (±5%) with identical electrical performance. Forward voltage specification differs at higher current levels (1.1 V @ 100 mA versus 900 mV @ 10 mA). Highest inventory availability among substitute options.

Frequently Asked Questions (FAQ)

Q: Can MM3Z27VT1G replace MM3Z27VT3G directly?

A: Yes. Both parts share identical electrical specifications: 27 V nominal Zener voltage, ±5% tolerance, 300 mW power rating, 80 Ohms maximum impedance, and SOD-323 package. The primary difference is packaging format (tape & reel versus individual packaging). Functional substitution is complete.

Q: What is the difference between ±2% and ±5% tolerance specifications?

A: Tolerance defines the acceptable deviation range from the nominal 27 V Zener voltage. BZX384-B27,115 with ±2% tolerance maintains voltage between 26.46 V and 27.54 V. MM3Z27VT3G with ±5% tolerance maintains voltage between 25.65 V and 28.35 V. Applications requiring tighter voltage regulation benefit from the ±2% specification.

Q: Are forward voltage differences significant for substitution?

A: Forward voltage specifications are measured at different current levels. MM3Z27VT3G specifies 900 mV @ 10 mA, while BZX384 series specifies 1.1 V @ 100 mA. These measurements occur at different operating points and do not prevent functional substitution in Zener diode applications where reverse-bias operation is primary.

Q: Does SZMM3Z27VT1G automotive qualification affect non-automotive applications?

A: No. AEC-Q101 qualification indicates enhanced reliability testing and traceability. Parts meeting automotive standards function identically in non-automotive applications. Automotive-qualified components are suitable for any application requiring the specified electrical characteristics.

Q: What packaging format should be selected for assembly?

A: Tape & reel packaging (MM3Z27VT1G, SZMM3Z27VT1G) is standard for automated pick-and-place assembly. Cut tape and Digi-Reel packaging (BZX384-B27,115) accommodates both automated and manual assembly processes. Selection depends on production equipment and volume requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed parts maintain ROHS3 compliance and moisture sensitivity level 1 (unlimited shelf life), ensuring regulatory conformance and extended storage capability without special handling requirements.

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