MMSZ4710T1 Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ4710T1 is a 25 V, 500 mW Zener diode in SOD-123 surface mount packaging manufactured by onsemi. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to support ongoing design requirements, maintenance operations, and production continuity where this diode was previously specified.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	25	V
Tolerance	±5	%
Power - Maximum	500	mW
Current - Reverse Leakage @ Vr	10 nA @ 19 V	nA
Voltage - Forward (Max) @ If	900 mV @ 10 mA	mV
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—

Substitute Part Grouping Explanation

Substitution of the MMSZ4710T1 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage rating: 25 V nominal with ±5% tolerance
Power dissipation capability: 500 mW minimum
Package type: SOD-123 surface mount
Reverse leakage current: 10 nA @ 19 V
Forward voltage: 900 mV @ 10 mA maximum
Operating temperature range: -55°C to 150°C

Substitution Categories:

Direct Equivalent: Parts meeting all primary criteria with identical electrical specifications and SOD-123 packaging.

Functional Equivalent: Parts with different zener voltage ratings or power ratings that may serve similar circuit functions but require design verification for specific applications.

Package Variant: Parts with alternative surface mount packages (SOD-123F) that differ from the original SOD-123 specification.

Parameter Comparison

Parameter	MMSZ4710T1	MMSZ4710T1G	MMSZ4712-TP	BZT52H-C24,115
Manufacturer	onsemi	onsemi	Micro Commercial Co	Nexperia USA Inc.
Voltage - Zener (Nom)	25 V	25 V	28 V	24 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	375 mW
Current - Reverse Leakage @ Vr	10 nA @ 19 V	10 nA @ 19 V	10 nA @ 21.2 V	50 nA @ 16.8 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	950 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-55 to 150°C	-55 to 150°C	-55 to 150°C	-65 to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-123	SOD-123	SOD-123F
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MMSZ4710T1G (onsemi): This part is the direct equivalent replacement for the obsolete MMSZ4710T1. It maintains identical electrical specifications across all critical parameters: 25 V zener voltage, 500 mW power rating, 10 nA reverse leakage current, and 900 mV forward voltage. The MMSZ4710T1G is currently in active production status with ROHS3 compliance and 2100 units in stock. This part is available in Cut Tape and Digi-Reel packaging options. Selection of this part requires no circuit redesign.

MMSZ4712-TP (Micro Commercial Co): This part provides functional equivalence with a 28 V zener voltage rating compared to the 25 V specification of the original part. The 500 mW power rating and SOD-123 package match the original specification. The 28 V rating represents a 12% increase in zener voltage, which may be acceptable in applications with voltage regulation tolerance margins. This part is in active production with ROHS3 compliance and 917 units in stock. Circuit analysis is required to confirm voltage tolerance compatibility.

BZT52H-C24,115 (Nexperia USA Inc.): This part offers a 24 V zener voltage rating with reduced power dissipation capability (375 mW versus 500 mW). The package differs from the original specification, using SOD-123F instead of SOD-123. The 24 V rating represents a 4% decrease in zener voltage. This part includes automotive qualification (AEC-Q101) and extended operating temperature range (-65°C to 150°C). Selection of this part requires verification of power dissipation requirements and physical package compatibility with the PCB layout.

Frequently Asked Questions (FAQ)

Q: Can MMSZ4710T1G be used as a direct replacement for MMSZ4710T1?

A: Yes. The MMSZ4710T1G maintains identical electrical specifications for zener voltage (25 V), power rating (500 mW), reverse leakage current (10 nA @ 19 V), forward voltage (900 mV @ 10 mA), and operating temperature range (-55°C to 150°C). Both parts use SOD-123 packaging. The primary difference is product status: MMSZ4710T1G is active production while MMSZ4710T1 is obsolete. ROHS3 compliance of the MMSZ4710T1G provides regulatory advantage over the non-compliant original part.

Q: What is the difference between SOD-123 and SOD-123F packaging?

A: SOD-123 and SOD-123F are distinct surface mount packages with different physical dimensions and lead configurations. SOD-123F is a variant with modified lead geometry. PCB layouts designed for SOD-123 may not accommodate SOD-123F without physical redesign. Verification of footprint compatibility is required before selecting BZT52H-C24,115.

Q: Can MMSZ4712-TP replace MMSZ4710T1 in all applications?

A: MMSZ4712-TP has a 28 V zener voltage rating compared to the 25 V specification of MMSZ4710T1. This 3 V difference represents a 12% increase in regulation voltage. Substitution is application-dependent. Circuits with strict voltage regulation requirements or narrow tolerance specifications may not accept this voltage deviation. Circuits with broader voltage tolerance margins may accommodate this part. Circuit analysis is required to determine compatibility.

Q: Why does BZT52H-C24,115 have lower power rating than the original part?

A: BZT52H-C24,115 is rated for 375 mW maximum power dissipation compared to 500 mW for MMSZ4710T1. This 25% reduction in power handling capability may limit its use in high-current applications. Selection of this part requires verification that circuit operating conditions do not exceed 375 mW power dissipation in the zener diode.

Q: What compliance advantages does MMSZ4710T1G offer?

A: MMSZ4710T1G carries ROHS3 compliance certification, whereas the original MMSZ4710T1 is non-compliant. ROHS3 compliance is required for many commercial and industrial applications, particularly in regulated markets. MMSZ4710T1G also maintains REACH Unaffected status. These certifications support regulatory requirements for new designs and production continuity.

Q: Are there inventory considerations for part selection?

A: MMSZ4710T1G has 2100 units in stock, MMSZ4712-TP has 917 units, and BZT52H-C24,115 has 6100 units available. Inventory levels support production requirements across all three active alternatives. The original MMSZ4710T1 has 1073 units in stock but is obsolete and should not be selected for new designs.

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