MMSZ4688 Zener Diode 4.7V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The MMSZ4688 is a surface mount Zener diode manufactured by onsemi, rated at 4.7V nominal Zener voltage with 500mW maximum power dissipation in SOD-123 package. The main part number MMSZ4688 is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 4.7V Zener regulation in compact surface mount form factor.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom) (Vz)	4.7	V
Tolerance	±5%	-
Power - Max	500	mW
Current - Reverse Leakage @ Vr	10 µA @ 3V	-
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-123	-

Substitute Part Grouping Explanation

Substitution eligibility for the MMSZ4688 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 4.7V (exact match required)
Power - Max: 500mW (exact match required)
Package / Case: SOD-123 (exact match required)
Mounting Type: Surface Mount (exact match required)
Operating Temperature Range: -55°C to 150°C (minimum requirement)

Secondary Compatibility Parameters:

Tolerance: ±5% (acceptable for standard applications)
Current - Reverse Leakage @ Vr: 10µA @ 3V (baseline specification)
Voltage - Forward (Vf) (Max) @ If: 900mV @ 10mA (baseline specification)

Substitute parts are grouped into three categories based on manufacturer origin and product qualification status:

Category 1: onsemi Standard Grade (Active Status) Parts meeting all primary criteria with active product status and RoHS3 compliance.

Category 2: onsemi Automotive Grade (Active Status) Parts with AEC-Q101 automotive qualification, meeting all primary criteria with active product status.

Category 3: Alternative Manufacturers (Active/Obsolete Status) Parts from other manufacturers meeting primary substitution criteria.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Vf @ 10mA (mV)	Ir @ Vr (µA)	Temp Range (°C)	Package	Status	Grade
MMSZ4688	onsemi	4.7	±5%	500	900	10 @ 3V	-55 to 150	SOD-123	Obsolete	Standard
MMSZ4688T1G	onsemi	4.7	-	500	900	10 @ 3V	-55 to 150	SOD-123	Active	Standard
MMSZ4688T3G	onsemi	4.7	-	500	900	10 @ 3V	-55 to 150	SOD-123	Active	Standard
MMSZ4V7T1G	onsemi	4.7	±5%	500	900	3 @ 2V	-55 to 150	SOD-123	Active	Standard
MMSZ5230BT1G	onsemi	4.7	±5%	500	900	5 @ 2V	-55 to 150	SOD-123	Active	Standard
SZMMSZ4688T1G	onsemi	4.7	±5%	500	900	10 @ 3V	-55 to 150	SOD-123	Active	Automotive
SZMMSZ4V7T1G	onsemi	4.7	±5%	500	900	3 @ 2V	-55 to 150	SOD-123	Active	Automotive
SZMMSZ5230BT1G	onsemi	4.7	±5%	500	900	5 @ 2V	-55 to 150	SOD-123	Active	Automotive
SZMMSZ4688T3G	onsemi	4.7	-	500	900	10 @ 3V	-55 to 150	SOD-123	Active	Automotive
CMHZ5230B TR13	Central Semiconductor Corp	4.7	±5%	500	900	5 @ 2V	-55 to 150	SOD-123	Obsolete	Standard
MMSZ4688-TP	Micro Commercial Co	4.7	±5%	500	950	10 @ 3V	-55 to 150	SOD-123	Active	Standard

Engineering Selection Recommendations

Primary Recommendation - onsemi Standard Grade Active Parts:

MMSZ4688T1G and MMSZ4688T3G are direct functional equivalents with active product status. Both parts maintain identical electrical specifications to the obsolete MMSZ4688 and carry RoHS3 compliance certification. These parts are suitable for new designs and ongoing production where standard grade qualification is acceptable.

Alternative Recommendation - onsemi Automotive Grade Active Parts:

SZMMSZ4688T1G and SZMMSZ4688T3G provide identical electrical performance with AEC-Q101 automotive qualification. These parts are required for automotive applications or designs requiring automotive-grade component certification. Product status is active with RoHS3 compliance.

Secondary Recommendation - Enhanced Leakage Performance:

MMSZ4V7T1G, MMSZ5230BT1G, SZMMSZ4V7T1G, and SZMMSZ5230BT1G offer reduced reverse leakage current specifications (3-5µA @ 2V versus 10µA @ 3V). These parts maintain all primary substitution criteria and active product status. Selection is appropriate when lower leakage performance provides circuit design benefits.

Alternative Manufacturer Option:

MMSZ4688-TP (Micro Commercial Co) meets all primary substitution criteria with active product status and RoHS3 compliance. Forward voltage specification is 950mV @ 10mA (50mV higher than baseline). This part is suitable where alternative manufacturer sourcing is acceptable.

Obsolete Status Parts:

CMHZ5230B TR13 (Central Semiconductor Corp) is classified as obsolete with RoHS non-compliant status. This part is not recommended for new designs or ongoing production.

Frequently Asked Questions (FAQ)

Q: Can MMSZ4688T1G directly replace the obsolete MMSZ4688?

A: Yes. MMSZ4688T1G is a direct functional equivalent with identical Zener voltage (4.7V), power rating (500mW), package (SOD-123), and operating temperature range (-55°C to 150°C). The part carries active product status and RoHS3 compliance.

Q: What is the difference between standard grade and automotive grade parts?

A: Automotive grade parts (SZMMSZ prefix) carry AEC-Q101 qualification and are required for automotive applications. Standard grade parts (MMSZ prefix) are suitable for general industrial and consumer applications. Electrical specifications are identical between corresponding part numbers.

Q: Are there performance differences between MMSZ4688T1G and MMSZ4V7T1G?

A: Both parts meet the primary substitution criteria of 4.7V Zener voltage and 500mW power rating in SOD-123 package. MMSZ4V7T1G specifies lower reverse leakage current (3µA @ 2V versus 10µA @ 3V). Selection depends on circuit leakage requirements.

Q: What does the packaging designation mean (TR, CT)?

A: TR indicates Tape & Reel packaging for automated assembly. CT indicates Cut Tape & Digi-Reel packaging. Both packaging formats contain identical components; selection is based on assembly process requirements.

Q: Is MMSZ4688-TP (Micro Commercial Co) compatible with onsemi MMSZ4688?

A: MMSZ4688-TP meets all primary substitution criteria with 4.7V Zener voltage, 500mW power rating, and SOD-123 package. Forward voltage is specified at 950mV @ 10mA (50mV higher than onsemi baseline of 900mV). Compatibility is confirmed for applications where this voltage difference is acceptable.

Q: Why is CMHZ5230B TR13 not recommended?

A: CMHZ5230B TR13 carries obsolete product status and RoHS non-compliant certification. New designs and ongoing production should utilize active status parts with current compliance certifications.

Q: Can I use automotive grade parts in non-automotive applications?

A: Yes. Automotive grade parts (SZMMSZ series) meet or exceed standard grade specifications and carry additional AEC-Q101 qualification. These parts are suitable for any application where standard grade parts are specified.

Q: What is the minimum operating temperature range requirement?

A: All substitute parts maintain the -55°C to 150°C operating temperature range specified for the original MMSZ4688. This range is consistent across all recommended substitutes.

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