MMSZ4705-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ4705-TP is an 18 V, 500 mW Zener diode manufactured by Micro Commercial Co in SOD-123 surface mount packaging. This component is an active product designed for voltage regulation and protection applications in electronic circuits. The part is supplied in Tape & Reel (TR) packaging format.

Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same product category. Alternative sources may be required due to inventory availability, supply chain considerations, or packaging format preferences while maintaining identical functional performance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	18	V
Tolerance	±5	%
Power - Maximum	500	mW
Current - Reverse Leakage @ Vr	50 nA @ 13.6 V	nA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by equivalence in the following critical parameters:

Zener Voltage (Vz): Must be 18 V nominal with ±5% tolerance
Power Dissipation Rating: Must be 500 mW maximum
Reverse Leakage Current: Must be 50 nA @ 13.6 V
Package Type: Must be SOD-123 surface mount
Operating Temperature Range: Must support -55°C to 150°C
Regulatory Compliance: Must maintain ROHS3 compliance and REACH unaffected status

The MMSZ4705T1G manufactured by onsemi meets all these electrical and mechanical requirements and is therefore a direct functional equivalent. The primary difference is the packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and manufacturer source.

Parameter Comparison

Parameter	MMSZ4705-TP (Micro Commercial Co)	MMSZ4705T1G (onsemi)	Match Status
Voltage - Zener (Nom)	18 V	18 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Current - Reverse Leakage @ Vr	50 nA @ 13.6 V	50 nA @ 13.6 V	Equivalent
Voltage - Forward (Vf) (Max) @ If	950 mV @ 10 mA	900 mV @ 10 mA	Within Specification
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	SOD-123	SOD-123	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The MMSZ4705T1G is a direct substitute for the MMSZ4705-TP based on electrical and mechanical equivalence. Both parts are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current and future applications.

The forward voltage specification for MMSZ4705T1G (900 mV @ 10 mA) is lower than the MMSZ4705-TP (950 mV @ 10 mA), which represents an improvement in forward conduction characteristics while remaining within acceptable operating parameters for Zener diode applications.

Selection between these parts should be based on packaging format availability and supply chain requirements. The MMSZ4705-TP is supplied in Tape & Reel format, while the MMSZ4705T1G is available in Cut Tape & Digi-Reel® format. Both formats are suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can MMSZ4705T1G replace MMSZ4705-TP in existing designs?

A: Yes. Both parts share identical Zener voltage (18 V), power rating (500 mW), reverse leakage current (50 nA @ 13.6 V), operating temperature range (-55°C to 150°C), and SOD-123 package specifications. The parts are electrically and mechanically interchangeable.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel® packaging?

A: Both are surface mount packaging formats suitable for automated assembly. Tape & Reel (TR) is a continuous reel format for high-volume production. Cut Tape & Digi-Reel® provides flexibility for lower-volume or mixed-component assembly. The electrical performance of the component is identical regardless of packaging format.

Q: Are there any compliance differences between these parts?

A: No. Both MMSZ4705-TP and MMSZ4705T1G are ROHS3 compliant, REACH unaffected, and carry identical regulatory certifications (ECCN: EAR99, HTSUS: 8541.10.0050).

Q: Does the forward voltage difference affect circuit performance?

A: The forward voltage difference (950 mV versus 900 mV @ 10 mA) is within normal Zener diode specification tolerances and does not affect substitution suitability. This parameter is secondary to the primary Zener voltage specification for voltage regulation applications.

Q: What is the Moisture Sensitivity Level (MSL) significance?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These components can be stored and handled without special moisture control measures, simplifying inventory and assembly logistics.

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