MMSZ4712T1 Equivalent & Substitute Parts

Part Overview

The MMSZ4712T1 is a Zener diode rated at 28 V nominal voltage with 500 mW power dissipation in a surface mount SOD-123 package. This component is manufactured by onsemi and is classified as obsolete. Due to its obsolete product status, identifying functionally equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	28 V
Tolerance	±5%
Power - Max	500 mW
Current - Reverse Leakage @ Vr	10 nA @ 21.2 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature Range	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MMSZ4712T1 is determined by the following critical electrical and mechanical parameters:

Electrical Parameters:

Zener voltage rating (Vz): 28 V nominal with ±5% tolerance
Maximum power dissipation: 500 mW
Reverse leakage current specification
Forward voltage characteristics
Operating temperature range: -55°C to 150°C

Mechanical Parameters:

Surface mount mounting type
SOD-123 package configuration
Moisture sensitivity level MSL 1

The MMSZ4713T1G is identified as a substitute part. While it operates at a different nominal Zener voltage (30 V versus 28 V), it maintains identical power rating, package type, temperature range, and electrical characteristics that allow functional substitution in applications where the voltage differential is acceptable within circuit design tolerances.

Parameter Comparison

Parameter	MMSZ4712T1	MMSZ4713T1G
Manufacturer	onsemi	onsemi
Category	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom) (Vz)	28 V	30 V
Tolerance	±5%	±5%
Power - Max	500 mW	500 mW
Current - Reverse Leakage @ Vr	10 nA @ 21.2 V	10 nA @ 22.8 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-123
Supplier Device Package	SOD-123	SOD-123
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
HTSUS	8541.10.0050	8541.10.0050

Engineering Selection Recommendations

The MMSZ4712T1 is classified as obsolete, making the MMSZ4713T1G the primary substitute option. The MMSZ4713T1G maintains active product status with onsemi, ensuring long-term availability and supply chain continuity.

Compliance Considerations:

The MMSZ4713T1G is ROHS3 compliant, whereas the MMSZ4712T1 is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements mandating RoHS compliance, the MMSZ4713T1G is the appropriate selection.

Both parts share identical REACH and ECCN classifications (REACH Unaffected, EAR99), indicating equivalent regulatory treatment for export and environmental compliance purposes.

Voltage Rating Differential:

The primary electrical difference is the nominal Zener voltage: MMSZ4712T1 operates at 28 V while MMSZ4713T1G operates at 30 V. This 2 V differential must be evaluated within the context of the specific circuit application. Both maintain ±5% tolerance and identical power dissipation, forward voltage, and temperature operating ranges.

Frequently Asked Questions (FAQ)

Q: Can the MMSZ4713T1G directly replace the MMSZ4712T1 in all applications?

A: Direct substitution depends on circuit design tolerance for the 2 V Zener voltage difference. The MMSZ4713T1G operates at 30 V nominal versus 28 V for the MMSZ4712T1. Applications with voltage regulation margins accommodating this differential support direct substitution. Applications with strict voltage specifications require circuit re-evaluation.

Q: Are the package dimensions identical between these parts?

A: Both parts use the SOD-123 surface mount package with identical mechanical specifications. PCB layout and reflow soldering parameters remain unchanged.

Q: What is the significance of the RoHS compliance difference?

A: The MMSZ4712T1 is RoHS non-compliant while the MMSZ4713T1G is ROHS3 compliant. For new designs or applications subject to RoHS directives, the MMSZ4713T1G is the required selection. Existing designs using the obsolete MMSZ4712T1 may require compliance updates when transitioning to the substitute part.

Q: Are the electrical characteristics otherwise identical?

A: Yes. Both parts share identical power ratings (500 mW), forward voltage specifications (900 mV @ 10 mA), operating temperature ranges (-55°C to 150°C), and reverse leakage current specifications (10 nA at their respective reference voltages).

Q: What is the packaging format difference?

A: The MMSZ4712T1 is supplied in standard packaging, while the MMSZ4713T1G is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for high-volume production and automated assembly processes.

Q: Why is the MMSZ4712T1 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The MMSZ4713T1G, with active product status, represents the current production equivalent within the onsemi Zener diode portfolio.

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