MMSZ5246B Zener Diode 16V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The MMSZ5246B is a surface mount Zener diode rated at 16V nominal voltage with 500mW power dissipation in SOD-123 packaging. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, direct replacement with active production equivalents is necessary for new designs and ongoing procurement. Substitute parts maintain identical electrical specifications and mechanical compatibility while offering active product status and improved availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 12V	nA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	mV
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for MMSZ5246B are grouped based on strict electrical and mechanical compatibility criteria. All substitute parts maintain the following core parameters identical to the main part:

Critical Substitution Parameters:

Voltage - Zener (Nom): 16V
Tolerance: ±5%
Power - Max: 500mW
Package / Case: SOD-123
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C
Moisture Sensitivity Level: 1 (Unlimited)

Substitutes are categorized into three groups:

Group 1: Direct Manufacturer Equivalents (onsemi Active Production) Parts with identical impedance (17 Ohms) and reverse leakage specifications (100 nA @ 12V). These include MMSZ5246BT1G, MMSZ5246ET1G, and automotive-grade variants SZMMSZ5246BT1G and SZMMSZ5246ET1G.

Group 2: Parametric Equivalents (onsemi Alternative Impedance) Parts with 40 Ohms impedance and 50 nA reverse leakage at different voltage points. These include MMSZ16T1G and SZMMSZ16T1G, which maintain all critical electrical parameters within acceptable substitution range.

Group 3: Cross-Manufacturer Equivalents Parts from alternative manufacturers (Vishay, Micro Commercial Co) with identical specifications. MMSZ4703T1G, SZMMSZ4703T1G, MMSZ4703-E3-08, and MMSZ5246B-TP maintain full electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Reverse Leakage	Vf (Max)	Packaging	RoHS Status
MMSZ5246B	onsemi	Obsolete	16V	±5%	500mW	17Ω	100nA@12V	900mV@10mA	SOD-123	—
MMSZ5246BT1G	onsemi	Active	16V	±5%	500mW	17Ω	100nA@12V	900mV@10mA	CT & Digi-Reel	ROHS3
MMSZ5246ET1G	onsemi	Active	16V	±5%	500mW	17Ω	100nA@12V	900mV@10mA	Tape & Reel	ROHS3
MMSZ16T1G	onsemi	Active	16V	±5%	500mW	40Ω	[email protected]	900mV@10mA	Tape & Reel	ROHS3
MMSZ4703T1G	onsemi	Active	16V	±5%	500mW	—	[email protected]	900mV@10mA	Tape & Reel	ROHS3
SZMMSZ16T1G	onsemi	Active	16V	±5%	500mW	40Ω	[email protected]	900mV@10mA	Tape & Reel	ROHS3
SZMMSZ4703T1G	onsemi	Active	16V	±5%	500mW	—	[email protected]	900mV@10mA	Tape & Reel	ROHS3
SZMMSZ5246BT1G	onsemi	Active	16V	±5%	500mW	17Ω	100nA@12V	900mV@10mA	Tape & Reel	ROHS3
SZMMSZ5246ET1G	onsemi	Active	16V	±5%	500mW	17Ω	100nA@12V	900mV@10mA	Tape & Reel	ROHS3
MMSZ4703-E3-08	Vishay	Active	16V	±5%	500mW	—	[email protected]	—	CT & Digi-Reel	ROHS3
MMSZ5246B-TP	Micro Commercial Co	Active	16V	±5%	500mW	17Ω	100nA@12V	900mV@10mA	Tape & Reel	ROHS3

Engineering Selection Recommendations

For Standard Applications: MMSZ5246BT1G or MMSZ5246ET1G are primary selections. Both are onsemi active production parts with identical electrical specifications to MMSZ5246B, including 17 Ohms impedance and 100 nA reverse leakage. Both carry ROHS3 compliance. MMSZ5246BT1G is supplied in Cut Tape & Digi-Reel packaging; MMSZ5246ET1G is supplied in Tape & Reel packaging. Selection depends on procurement and assembly requirements.

For Automotive Applications: SZMMSZ5246BT1G or SZMMSZ5246ET1G are required selections. These parts carry automotive grade designation and AEC-Q101 qualification. Electrical specifications are identical to standard variants. Use when design requires automotive-qualified components.

For Alternative Impedance Tolerance: MMSZ16T1G or SZMMSZ16T1G provide 40 Ohms impedance with 50 nA reverse leakage. These are suitable when circuit design accommodates higher impedance. SZMMSZ16T1G includes automotive qualification.

For Cross-Manufacturer Sourcing: MMSZ5246B-TP (Micro Commercial Co) maintains identical specifications to MMSZ5246BT1G and MMSZ5246ET1G. MMSZ4703T1G and SZMMSZ4703T1G (onsemi) provide alternative part numbers with 50 nA reverse leakage. MMSZ4703-E3-08 (Vishay) is available for cross-manufacturer redundancy.

All substitute parts maintain SOD-123 package compatibility, -55°C to 150°C operating temperature range, and MSL 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5246BT1G directly replace MMSZ5246B in existing designs?

A: Yes. MMSZ5246BT1G maintains identical electrical specifications: 16V nominal voltage, ±5% tolerance, 500mW power rating, 17 Ohms impedance, and 100 nA reverse leakage at 12V. SOD-123 package and operating temperature range are identical. The primary difference is product status (active vs. obsolete) and packaging format (Cut Tape & Digi-Reel vs. original packaging).

Q: What is the difference between MMSZ5246BT1G and MMSZ16T1G?

A: Both are onsemi 16V 500mW Zener diodes in SOD-123 packaging. The key difference is impedance: MMSZ5246BT1G has 17 Ohms maximum impedance with 100 nA reverse leakage at 12V, while MMSZ16T1G has 40 Ohms impedance with 50 nA reverse leakage at 11.2V. Selection depends on circuit impedance requirements. Both are electrically and mechanically compatible.

Q: When should automotive-grade parts (SZMMSZ series) be used?

A: Automotive-grade parts carry AEC-Q101 qualification and are required for applications subject to automotive industry standards. SZMMSZ5246BT1G, SZMMSZ5246ET1G, SZMMSZ16T1G, and SZMMSZ4703T1G are automotive equivalents. Use these when design specifications mandate automotive qualification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active production substitute parts listed carry ROHS3 compliance status. The original MMSZ5246B does not specify RoHS status due to obsolete designation.

Q: What packaging options are available for substitutes?

A: Substitute parts are supplied in two packaging formats: Cut Tape & Digi-Reel (CT) and Tape & Reel (TR). MMSZ5246BT1G uses CT & Digi-Reel; MMSZ5246ET1G, MMSZ16T1G, MMSZ4703T1G, and automotive variants use Tape & Reel. Selection depends on assembly equipment and procurement requirements.

Q: Can MMSZ4703-E3-08 (Vishay) be used as a substitute?

A: Yes. MMSZ4703-E3-08 maintains 16V nominal voltage, ±5% tolerance, and 500mW power rating in SOD-123 packaging. Reverse leakage is 50 nA at 12.1V. This part is suitable for cross-manufacturer sourcing and redundancy planning.

Q: Is moisture sensitivity a concern for these parts?

A: No. All parts, including the original MMSZ5246B and all substitutes, carry MSL 1 (Unlimited) moisture sensitivity rating. This indicates no moisture sensitivity precautions are required during storage or handling.

Q: What is the inventory status of substitute parts?

A: MMSZ5246BT1G has 133,400 pieces in stock. MMSZ4703T1G has 125,400 pieces. SZMMSZ16T1G has 370,051 pieces. MMSZ5246ET1G has 19,145 pieces. All substitute parts maintain active production status with substantial inventory availability.

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