MMSZ8V2T3G Equivalent & Substitute Parts

Part Overview

The MMSZ8V2T3G is a Zener diode rated at 8.2 V nominal voltage with 500 mW power dissipation in a surface mount SOD-123 package, manufactured by onsemi. This part is classified as obsolete and no longer in active production. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and design updates.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	8.2 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	15 Ohms
Current - Reverse Leakage @ Vr	700 nA @ 5 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MMSZ8V2T3G is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 8.2 V (exact match required)
Power - Max: 500 mW (exact match required)
Package / Case: SOD-123 (exact match required)
Operating Temperature Range: -55°C ~ 150°C (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Parameters:

Tolerance: ±5% (preferred for direct equivalence)
Impedance (Max): 15 Ohms or lower (lower impedance acceptable)
Current - Reverse Leakage: 700 nA @ 5 V or lower (lower leakage acceptable)
Voltage - Forward (Vf): 900 mV @ 10 mA (exact match)

Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (active production alternatives with identical electrical specifications) and Parametric Equivalents (active production parts meeting all critical parameters with minor variations in secondary characteristics).

Parameter Comparison

Part Number	Manufacturer	Product Status	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	RoHS	Grade
MMSZ8V2T3G	onsemi	Obsolete	8.2	±5%	500	15	700 nA @ 5 V	900 mV @ 10 mA	-55 to 150	SOD-123	N/A	Standard
MMSZ4694T1G	onsemi	Active	8.2	—	500	—	1 µA @ 6.2 V	900 mV @ 10 mA	-55 to 150	SOD-123	ROHS3	Standard
MMSZ5237BT1G	onsemi	Active	8.2	±5%	500	8	3 µA @ 6.5 V	900 mV @ 10 mA	-55 to 150	SOD-123	ROHS3	Standard
MMSZ5237ET1G	onsemi	Active	8.2	±5%	500	8	3 µA @ 6.5 V	900 mV @ 10 mA	-55 to 150	SOD-123	ROHS3	Standard
SZMMSZ4694T1G	onsemi	Active	8.2	±5%	500	—	1 µA @ 6.2 V	900 mV @ 10 mA	-55 to 150	SOD-123	ROHS3	Automotive
SZMMSZ5237BT1G	onsemi	Active	8.2	±5%	500	8	3 µA @ 6.5 V	900 mV @ 10 mA	-55 to 150	SOD-123	ROHS3	Automotive
SZMMSZ5237ET1G	onsemi	Active	8.2	±5%	500	8	3 µA @ 6.5 V	900 mV @ 10 mA	-55 to 150	SOD-123	ROHS3	Automotive
MMSZ8V2ET1G	onsemi	Active	8.2	±5%	500	15	500 nA @ 6 V	900 mV @ 10 mA	-55 to 150	SOD-123	ROHS3	Automotive
MMSZ8V2T1G	onsemi	Active	8.2	±5%	500	15	700 nA @ 5 V	900 mV @ 10 mA	-55 to 150	SOD-123	ROHS3	Standard
SZMMSZ8V2ET1G	onsemi	Active	8.2	±5%	500	15	700 nA @ 5 V	900 mV @ 10 mA	-55 to 150	SOD-123	ROHS3	Automotive
SZMMSZ8V2T1G	onsemi	Active	8.2	±5%	500	15	700 nA @ 5 V	900 mV @ 10 mA	-55 to 150	SOD-123	ROHS3	Automotive

Engineering Selection Recommendations

For Standard Industrial Applications:

MMSZ8V2T1G is the direct parametric equivalent to MMSZ8V2T3G. Both parts share identical electrical specifications including 15 Ohms maximum impedance and 700 nA reverse leakage at 5 V. MMSZ8V2T1G is in active production with ROHS3 compliance and offers superior availability (17,400 units in stock).

For Automotive Applications (AEC-Q101 Qualified):

SZMMSZ8V2T1G and SZMMSZ8V2ET1G are automotive-grade equivalents with AEC-Q101 qualification. SZMMSZ8V2T1G provides the closest electrical match to the original part with identical impedance and reverse leakage specifications. SZMMSZ8V2T1G has the highest inventory availability (77,300 units) among automotive options.

For Applications Requiring Lower Impedance:

MMSZ5237BT1G and MMSZ5237ET1G offer reduced impedance (8 Ohms maximum) while maintaining all other critical parameters. These parts are suitable for applications where lower dynamic impedance is beneficial. SZMMSZ5237BT1G provides the automotive-qualified equivalent with 47,400 units in stock.

For Applications with Relaxed Leakage Requirements:

MMSZ4694T1G and SZMMSZ4694T1G accept higher reverse leakage (1 µA @ 6.2 V) compared to the original specification. These parts are suitable for non-critical leakage applications and offer cost optimization opportunities.

All substitute parts maintain the SOD-123 surface mount package, -55°C to 150°C operating temperature range, and 900 mV forward voltage specification of the original MMSZ8V2T3G.

Frequently Asked Questions (FAQ)

Q: Can MMSZ8V2T1G be used as a direct replacement for MMSZ8V2T3G?

A: Yes. MMSZ8V2T1G is a parametric equivalent with identical electrical specifications: 8.2 V nominal voltage, ±5% tolerance, 500 mW power rating, 15 Ohms maximum impedance, 700 nA reverse leakage at 5 V, and SOD-123 package. The primary difference is product status (active vs. obsolete) and RoHS3 compliance.

Q: What is the difference between standard and automotive-grade parts (SZMMSZ prefix)?

A: Automotive-grade parts carry the SZMMSZ prefix and are qualified to AEC-Q101 standard. These parts undergo additional qualification testing and are suitable for automotive applications. Standard-grade parts (MMSZ prefix) are suitable for industrial and consumer applications. Electrical specifications remain identical between corresponding standard and automotive variants.

Q: Can I use MMSZ5237BT1G instead of MMSZ8V2T1G?

A: Yes, with consideration of impedance differences. MMSZ5237BT1G maintains all critical parameters (8.2 V, ±5%, 500 mW, SOD-123, -55°C to 150°C) but offers lower impedance (8 Ohms vs. 15 Ohms). Lower impedance is generally acceptable and may improve circuit performance in voltage regulation applications. Reverse leakage is higher (3 µA @ 6.5 V vs. 700 nA @ 5 V), which is acceptable for most applications.

Q: Are all substitute parts RoHS3 compliant?

A: All active production substitute parts listed are RoHS3 compliant. The original MMSZ8V2T3G (obsolete) does not carry RoHS certification status. RoHS3 compliance is standard for all current onsemi Zener diode production.

Q: What packaging options are available for these substitute parts?

A: Substitute parts are available in Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging formats. All parts use the SOD-123 surface mount package. Packaging format selection depends on production volume and assembly requirements.

Q: Is there a performance difference between MMSZ8V2ET1G and MMSZ8V2T1G?

A: Both parts share identical impedance (15 Ohms) and forward voltage specifications. MMSZ8V2ET1G has slightly lower reverse leakage (500 nA @ 6 V vs. 700 nA @ 5 V) and carries automotive qualification (AEC-Q101). For non-automotive applications, MMSZ8V2T1G is suitable. For automotive applications, MMSZ8V2ET1G or SZMMSZ8V2ET1G are required.

Q: Can MMSZ4694T1G be used in applications sensitive to reverse leakage?

A: MMSZ4694T1G has higher reverse leakage (1 µA @ 6.2 V) compared to MMSZ8V2T1G (700 nA @ 5 V). This part is suitable for applications where reverse leakage is not a critical parameter. For leakage-sensitive applications, MMSZ8V2T1G, MMSZ8V2ET1G, or MMSZ5237 series parts are recommended.

Q: What is the inventory status of substitute parts?

A: SZMMSZ8V2T1G has the highest availability (77,300 units). MMSZ8V2T1G has 17,400 units. SZMMSZ5237BT1G has 47,400 units. MMSZ4694T1G has 290,400 units. All substitute parts are in active production with continuous availability.

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