MM3Z56VT1G Equivalent & Substitute Parts

Part Overview

The MM3Z56VT1G is a 56 V, 300 mW Zener diode manufactured by onsemi in SOD-323 surface mount packaging. This component is classified as an active product and is RoHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications in electronic circuits. Substitute parts are identified based on matching electrical characteristics and mechanical compatibility to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	56	V
Power - Maximum	300	mW
Impedance (Maximum)	200	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 39.2 V	nA
Voltage - Forward (Maximum) @ If	900 mV @ 10 mA	mV
Operating Temperature Range	-65 to 150	°C
Package / Case	SOD-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MM3Z56VT1G is determined by the following critical parameters:

Electrical Equivalence Criteria:

Nominal Zener voltage of 56 V
Maximum power dissipation of 300 mW
Maximum impedance of 200 Ohms
Reverse leakage current of 50 nA @ 39.2 V
Operating temperature range of -65°C to 150°C

Mechanical Compatibility Criteria:

SOD-323 package / SC-76 case
Surface mount mounting type
Tape & Reel packaging format

Compliance Criteria:

RoHS3 compliance
Active product status

All substitute parts listed below meet these criteria. Tolerance variations (±2%, ±5%, ±7%) represent acceptable deviations in Zener voltage specification and do not affect functional substitution in standard applications. Forward voltage differences at specified test conditions are within acceptable ranges for circuit operation.

Parameter Comparison

Parameter	MM3Z56VT1G (onsemi)	BZX384-B56,115 (Nexperia)	BZX384-B56F (Nexperia)	BZX384-B56Z (Nexperia)	BZX384-C56,115 (Nexperia)
Voltage - Zener (Nom)	56 V	56 V	56 V	56 V	56 V
Tolerance	±7%	±2%	±2%	±2%	±5%
Power - Max	300 mW	300 mW	300 mW	300 mW	300 mW
Impedance (Max)	200 Ohms	200 Ohms	200 Ohms	200 Ohms	200 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 39.2 V	50 nA @ 39.2 V	50 nA @ 39.2 V	50 nA @ 39.2 V	50 nA @ 39.2 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	1.1 V @ 100 mA	1.1 V @ 100 mA	1.1 V @ 100 mA	1.1 V @ 100 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Package / Case	SOD-323	SOD-323	SOD-323	SOD-323	SOD-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active products with RoHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the MM3Z56VT1G.

BZX384-B56,115, BZX384-B56F, and BZX384-B56Z are manufactured by Nexperia USA Inc. and feature ±2% tolerance specifications, providing tighter voltage regulation compared to the MM3Z56VT1G (±7% tolerance). These parts are suitable for applications requiring enhanced voltage accuracy.

BZX384-C56,115 is manufactured by Nexperia USA Inc. with ±5% tolerance, offering a middle-ground specification between the MM3Z56VT1G and the tighter tolerance variants.

All substitute parts maintain identical maximum power dissipation (300 mW), impedance characteristics (200 Ohms maximum), reverse leakage current (50 nA @ 39.2 V), and operating temperature range (-65°C to 150°C). All parts are packaged in SOD-323 surface mount format with Tape & Reel delivery.

Selection among substitute parts should be based on tolerance requirements specific to the application circuit. Tighter tolerance parts (±2%) are appropriate for precision voltage reference applications, while standard tolerance parts (±5% to ±7%) are suitable for general protection and regulation functions.

Frequently Asked Questions (FAQ)

Q: Can BZX384-B56,115 directly replace MM3Z56VT1G in my circuit?

A: Yes. Both parts share identical nominal Zener voltage (56 V), maximum power rating (300 mW), impedance (200 Ohms), reverse leakage current (50 nA @ 39.2 V), and operating temperature range (-65°C to 150°C). Both are packaged in SOD-323 surface mount format. The BZX384-B56,115 features ±2% tolerance versus the MM3Z56VT1G's ±7% tolerance, making it suitable for direct substitution with improved voltage accuracy.

Q: What is the difference between BZX384-B56F, BZX384-B56,115, and BZX384-B56Z?

A: All three parts are manufactured by Nexperia USA Inc. and share identical electrical specifications: 56 V nominal Zener voltage, 300 mW maximum power, 200 Ohms maximum impedance, and ±2% tolerance. The designations (B56F, B56,115, B56Z) represent different manufacturing codes or packaging variants within the BZX384 series. All are functionally equivalent for circuit applications.

Q: Why does BZX384-C56,115 have a different tolerance than other BZX384 variants?

A: The BZX384-C56,115 is specified with ±5% tolerance, while BZX384-B56,115, BZX384-B56F, and BZX384-B56Z are specified with ±2% tolerance. Both tolerance classes meet the electrical requirements for 56 V Zener diodes in SOD-323 packaging. Selection depends on the voltage accuracy requirements of the specific application.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The MM3Z56VT1G and all listed substitute parts (BZX384-B56,115, BZX384-B56F, BZX384-B56Z, BZX384-C56,115) are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: Can I use these parts interchangeably on the same PCB assembly?

A: Yes. All parts are packaged in SOD-323 surface mount format with identical pin configuration and footprint. They are mechanically and electrically interchangeable on PCB assemblies designed for SOD-323 components. No PCB layout modifications are required.

Q: What is the significance of the forward voltage difference between MM3Z56VT1G and BZX384 variants?

A: The MM3Z56VT1G specifies 900 mV @ 10 mA forward voltage, while BZX384 variants specify 1.1 V @ 100 mA. These measurements are taken at different test currents and do not indicate incompatibility. Both specifications fall within acceptable ranges for Zener diode forward conduction characteristics and do not affect circuit operation in standard applications.

Q: Which substitute part should I select for a precision voltage reference application?

A: For precision applications requiring tight voltage regulation, select BZX384-B56,115, BZX384-B56F, or BZX384-B56Z, all featuring ±2% tolerance. These parts provide superior voltage accuracy compared to the MM3Z56VT1G (±7% tolerance) and BZX384-C56,115 (±5% tolerance).

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