MM3Z2V4ST1 Equivalent & Substitute Parts

Part Overview

The MM3Z2V4ST1 is a Zener diode rated at 2.4 V nominal with 200 mW maximum power dissipation in a surface mount SOD-323 package. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications. Substitute parts must maintain electrical compatibility across zener voltage, power rating, and thermal operating range while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.4	V
Tolerance	±4%	—
Power - Max	200	mW
Impedance (Max)	100	Ohms
Current - Reverse Leakage @ Vr	120	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the MM3Z2V4ST1 are classified based on electrical parameter alignment and product status. The primary substitution criteria are:

Critical Parameters for Substitution:

Zener voltage nominal value: 2.4 V
Package type: SOD-323 (SC-76)
Mounting type: Surface Mount
Operating temperature range: -65°C to 150°C
Impedance (Max): 100 Ohms

Substitution Categories:

Direct Manufacturer Substitute (Active Status): MM3Z2V4T1G maintains the same base product number (MM3Z2) and zener voltage specification. This part is manufactured by onsemi and carries active product status, providing long-term availability. The power rating increases to 300 mW, which is compatible with applications designed for the 200 mW part. Tolerance widens to ±8%, and reverse leakage current decreases to 50 µA @ 1 V.

Similar Manufacturer Substitute (Cross-Manufacturer): BZX384-C2V4,115 is manufactured by Nexperia USA Inc. and provides equivalent electrical performance with 300 mW power rating and ±5% tolerance. This part maintains the same zener voltage and package configuration with active product status.

Parametric Equivalents (Automotive Grade): GDZ2V4B-HG3-08 and GDZ2V4B-HG3-18 are manufactured by Vishay General Semiconductor - Diodes Division. Both parts match the original 200 mW power rating and 2.4 V zener voltage with improved ±2% tolerance. These parts carry AEC-Q101 automotive qualification and active product status. The primary difference between these two variants relates to packaging reel configuration (08 and 18 designations).

Parameter Comparison

Parameter	MM3Z2V4ST1 (Main)	MM3Z2V4T1G	BZX384-C2V4,115	GDZ2V4B-HG3-08	GDZ2V4B-HG3-18
Manufacturer	onsemi	onsemi	Nexperia USA Inc.	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - Zener (Nom)	2.4 V	2.4 V	2.4 V	2.4 V	2.4 V
Tolerance	±4%	±8%	±5%	±2%	±2%
Power - Max	200 mW	300 mW	300 mW	200 mW	200 mW
Impedance (Max)	100 Ohms	100 Ohms	100 Ohms	100 Ohms	100 Ohms
Current - Reverse Leakage @ Vr	120 µA @ 1 V	50 µA @ 1 V	50 µA @ 1 V	120 µA @ 1 V	120 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	1.1 V @ 100 mA	Not specified	Not specified
Operating Temperature	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
Package / Case	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	—	—	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

For Direct Replacement with Extended Availability: MM3Z2V4T1G is the primary substitute for the obsolete MM3Z2V4ST1. Both parts share the same manufacturer (onsemi) and base product number (MM3Z2). The MM3Z2V4T1G carries active product status with significantly higher inventory availability (32,400 pcs in stock versus 933 pcs for the original part). The increased power rating (300 mW versus 200 mW) provides design margin without affecting circuit compatibility. This part is ROHS3 compliant and suitable for new designs and production continuity.

For Cross-Manufacturer Compatibility: BZX384-C2V4,115 manufactured by Nexperia USA Inc. provides equivalent electrical performance with 300 mW power rating and ±5% tolerance. This part maintains all critical electrical parameters and is ROHS3 compliant. The higher inventory level (49,536 pcs) ensures long-term supply security. This option is suitable when multi-source qualification is required or when onsemi supply is constrained.

For Automotive and High-Reliability Applications: GDZ2V4B-HG3-08 and GDZ2V4B-HG3-18 manufactured by Vishay General Semiconductor are qualified to AEC-Q101 automotive standards. These parts maintain the original 200 mW power rating with improved ±2% tolerance and are ROHS3 compliant. The automotive qualification makes these parts suitable for automotive, industrial, and mission-critical applications. The two variants differ only in reel configuration; selection depends on packaging and handling requirements.

Compliance Considerations: All substitute parts are ROHS3 compliant, addressing the non-compliant status of the original MM3Z2V4ST1. All parts maintain REACH unaffected status and EAR99 export classification. Moisture sensitivity level remains at MSL 1 (Unlimited) across all options.

Frequently Asked Questions (FAQ)

Q: Can MM3Z2V4T1G directly replace MM3Z2V4ST1 in existing designs? A: Yes. MM3Z2V4T1G maintains identical zener voltage (2.4 V), impedance (100 Ohms), operating temperature range (-65°C to 150°C), and SOD-323 package configuration. The increased power rating (300 mW versus 200 mW) is compatible with applications designed for the 200 mW part. Both parts are manufactured by onsemi and share the same base product number.

Q: What is the difference between GDZ2V4B-HG3-08 and GDZ2V4B-HG3-18? A: Both parts are electrically identical with 2.4 V zener voltage, 200 mW power rating, ±2% tolerance, and AEC-Q101 automotive qualification. The numerical suffixes (08 and 18) designate different reel configurations for tape and reel packaging. Selection depends on your assembly equipment specifications and packaging requirements.

Q: Why do some substitutes have higher power ratings (300 mW) than the original (200 mW)? A: Higher power ratings provide design margin and improved thermal performance without affecting circuit operation. A 300 mW rated part can safely operate in applications designed for 200 mW. The zener voltage, impedance, and all other critical electrical parameters remain equivalent.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts listed (MM3Z2V4T1G, BZX384-C2V4,115, GDZ2V4B-HG3-08, and GDZ2V4B-HG3-18) are ROHS3 compliant. The original MM3Z2V4ST1 is RoHS non-compliant, making substitution necessary for new designs and regulatory compliance.

Q: Which substitute is best for automotive applications? A: GDZ2V4B-HG3-08 and GDZ2V4B-HG3-18 are qualified to AEC-Q101 automotive standards. These parts are the specified choice for automotive, industrial, and mission-critical applications requiring automotive-grade component qualification.

Q: What is the tolerance difference between substitutes, and does it matter? A: Tolerance specifications are ±4% (original), ±8% (MM3Z2V4T1G), ±5% (BZX384-C2V4,115), and ±2% (Vishay parts). Tighter tolerance (lower percentage) provides more precise zener voltage regulation. For most applications, all tolerances are functionally equivalent. Applications requiring tighter voltage regulation benefit from the ±2% Vishay parts.

Q: Can I use BZX384-C2V4,115 as a substitute? A: Yes. BZX384-C2V4,115 maintains the 2.4 V zener voltage, SOD-323 package, and operating temperature range. The 300 mW power rating and ±5% tolerance are compatible with the original design. This part is manufactured by Nexperia USA Inc. and carries active product status with high inventory availability.

Q: What is the reverse leakage current difference, and is it significant? A: The original MM3Z2V4ST1 specifies 120 µA @ 1 V reverse leakage. MM3Z2V4T1G and BZX384-C2V4,115 specify 50 µA @ 1 V, representing lower leakage current. GDZ2V4B-HG3-08 and GDZ2V4B-HG3-18 match the original at 120 µA @ 1 V. Lower leakage current improves efficiency in low-power applications but is not critical for most standard zener diode applications.

Q: Is the forward voltage specification important for substitution? A: Forward voltage is specified for MM3Z2V4ST1 (900 mV @ 10 mA) and MM3Z2V4T1G (900 mV @ 10 mA), indicating identical forward conduction characteristics. BZX384-C2V4,115 specifies 1.1 V @ 100 mA at a different test current. Vishay parts do not specify forward voltage. For zener diode applications, forward voltage is typically not a critical substitution parameter unless the design specifically operates in forward conduction mode.

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