MMSZ4703 Equivalent & Substitute Parts

Part Overview

The MMSZ4703 is a Zener diode rated at 16 V nominal voltage with 500 mW maximum power dissipation in a surface mount SOD-123 package. This component is classified as obsolete by the original manufacturer (onsemi). Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and legacy system support. Substitute parts must maintain electrical equivalence across voltage regulation, power handling, and thermal characteristics while accommodating different packaging formats and qualification levels.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the MMSZ4703 is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 16 V
Power - Max: 500 mW
Tolerance: ±5%
Package / Case: SOD-123
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA

Secondary Considerations:

Current - Reverse Leakage: Acceptable within specified test conditions
Impedance (Zzt): Varies by part series; lower impedance indicates improved performance characteristics
Product Status: Active parts are preferred over obsolete classifications
RoHS Compliance: ROHS3 Compliant status ensures regulatory alignment
Packaging Format: Tape & Reel (TR), Cut Tape (CT), or Digi-Reel® formats are interchangeable for manufacturing processes
Automotive Grade & AEC-Q101 Qualification: Available for applications requiring automotive-grade reliability

All substitute parts listed maintain full electrical equivalence to the MMSZ4703 across the primary substitution criteria. Differences in impedance, reverse leakage test conditions, and qualification levels do not affect functional interchangeability in standard applications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Vf (Max) @ If	Operating Temp	Package	Product Status	Packaging Format	Grade
MMSZ4703	onsemi	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Obsolete	—	Standard
MMSZ16T1G	onsemi	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Tape & Reel (TR)	Standard
MMSZ4703T1G	onsemi	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Tape & Reel (TR)	Standard
MMSZ5246BT1G	onsemi	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Cut Tape (CT) & Digi-Reel®	Standard
MMSZ5246ET1G	onsemi	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Tape & Reel (TR)	Standard
SZMMSZ16T1G	onsemi	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Tape & Reel (TR)	Automotive (AEC-Q101)
SZMMSZ4703T1G	onsemi	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Tape & Reel (TR)	Automotive (AEC-Q101)
SZMMSZ5246BT1G	onsemi	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Tape & Reel (TR)	Automotive (AEC-Q101)
SZMMSZ5246ET1G	onsemi	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Tape & Reel (TR)	Automotive (AEC-Q101)
MMSZ4703-TP	Micro Commercial Co	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Tape & Reel (TR)	Standard
MMSZ5246B-TP	Micro Commercial Co	16 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Tape & Reel (TR)	Standard

Engineering Selection Recommendations

For Standard Applications:

Select MMSZ4703T1G, MMSZ16T1G, MMSZ5246ET1G, or MMSZ5246BT1G from onsemi. These parts are in active production status and carry ROHS3 compliance. MMSZ4703T1G maintains the original base part number designation and offers the highest inventory availability (125,400 units). MMSZ5246 series variants feature lower impedance (17 Ohms maximum) compared to MMSZ16T1G and MMSZ4703T1G (40 Ohms maximum), providing superior high-frequency performance characteristics.

For Automotive Applications:

Select SZMMSZ4703T1G, SZMMSZ16T1G, SZMMSZ5246BT1G, or SZMMSZ5246ET1G. These parts carry automotive-grade designation with AEC-Q101 qualification, meeting automotive reliability and qualification standards. SZMMSZ4703T1G and SZMMSZ16T1G maintain 40 Ohms maximum impedance, while SZMMSZ5246 variants provide 17 Ohms maximum impedance.

For Alternative Manufacturers:

Micro Commercial Co supplies MMSZ4703-TP and MMSZ5246B-TP as active alternatives. Both maintain full electrical equivalence and ROHS3 compliance. Inventory availability is lower than onsemi equivalents (1,950 and 4,100 units respectively).

Packaging Format Selection:

Tape & Reel (TR) format is standard for high-volume manufacturing. Cut Tape (CT) & Digi-Reel® format (MMSZ5246BT1G) accommodates lower-volume or mixed-component assembly processes.

Frequently Asked Questions (FAQ)

Q: Can MMSZ4703 be directly replaced with MMSZ4703T1G?

A: Yes. MMSZ4703T1G is the active production equivalent of the obsolete MMSZ4703. Both parts share identical electrical specifications: 16 V nominal Zener voltage, 500 mW power rating, ±5% tolerance, and SOD-123 package. The primary difference is product status (active vs. obsolete) and packaging format (Tape & Reel vs. unspecified).

Q: What is the difference between MMSZ16T1G and MMSZ4703T1G?

A: Both parts are electrically equivalent with 16 V nominal voltage, 500 mW power rating, and SOD-123 package. The difference lies in the base part number designation (MMSZ16 vs. MMSZ4703) and impedance specification. MMSZ16T1G specifies 40 Ohms maximum impedance at 1 kHz, while MMSZ4703T1G does not list impedance as a specified parameter. Both are suitable for direct substitution.

Q: Why do MMSZ5246 series parts have lower impedance than MMSZ16/MMSZ4703 series?

A: MMSZ5246 series parts specify 17 Ohms maximum impedance compared to 40 Ohms for MMSZ16T1G and MMSZ4703T1G. Lower impedance indicates improved dynamic response and reduced voltage ripple in regulation circuits. This is a performance enhancement, not a deviation from specification. MMSZ5246 variants are fully interchangeable with MMSZ4703 in applications where the lower impedance provides additional margin.

Q: Are automotive-grade SZMMSZ parts suitable for non-automotive applications?

A: Yes. Automotive-grade parts with AEC-Q101 qualification exceed standard reliability requirements and are suitable for any application. The SZMMSZ prefix indicates automotive qualification; the electrical specifications remain identical to standard-grade equivalents. Use automotive-grade parts when enhanced reliability or qualification documentation is required.

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

A: Both formats contain the same component in SOD-123 package. Tape & Reel (TR) is continuous reel format optimized for high-speed automated assembly. Cut Tape (CT) & Digi-Reel® format provides flexibility for lower-volume or mixed-component pick-and-place operations. Electrical performance is identical; selection depends on assembly process requirements.

Q: Can I substitute a Micro Commercial Co part (MMSZ4703-TP) for an onsemi part?

A: Yes. MMSZ4703-TP from Micro Commercial Co is electrically equivalent to onsemi MMSZ4703T1G. Both maintain 16 V nominal voltage, 500 mW power rating, ±5% tolerance, SOD-123 package, and ROHS3 compliance. Reverse leakage test conditions differ slightly (50 nA @ 11.4 V vs. 50 nA @ 12.1 V), but this does not affect functional interchangeability.

Q: Which substitute part offers the best availability?

A: SZMMSZ16T1G offers the highest inventory availability at 370,051 units. MMSZ4703T1G provides 125,400 units. Both are suitable for immediate procurement. MMSZ5246 series variants (MMSZ5246BT1G and MMSZ5246ET1G) offer 133,400 and 19,145 units respectively.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 Compliant status. The original MMSZ4703 does not specify RoHS status, but all active production equivalents meet RoHS3 requirements.

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