MM5Z6V2ST1 Equivalent & Substitute Parts

Part Overview

The MM5Z6V2ST1 is a Zener diode rated at 6.2 V nominal with 200 mW maximum power dissipation in a surface mount SOD-523 package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement. The part is RoHS non-compliant and represents an older generation of Zener diode technology. Active alternatives with improved specifications and regulatory compliance are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.2	V
Tolerance	±2%	—
Power - Max	200	mW
Impedance (Max)	10	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 4 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-79, SOD-523	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MM5Z6V2ST1 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 6.2 V nominal
Package type: SOD-523 (SC-79) or compatible surface mount packages
Operating temperature range: -65°C to 150°C minimum
Mounting type: Surface mount

Secondary Compatibility Factors:

Power dissipation rating: Equal to or greater than 200 mW
Impedance (Zzt): 10 Ohms or lower preferred for circuit stability
Reverse leakage current: 3 µA @ 4 V or lower
Forward voltage: Consistent with 900 mV @ 10 mA specification

Substitute parts are grouped into two categories: Direct Package Equivalents (SOD-523 package) and Alternative Package Options (SOD-323F package). All listed substitutes maintain the 6.2 V Zener voltage specification and surface mount mounting type. Power ratings vary from 150 mW to 500 mW, providing options for different circuit requirements. Regulatory compliance status differs between parts, with active substitutes offering RoHS3 compliance and automotive qualifications where applicable.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Status	RoHS
MM5Z6V2ST1	onsemi	6.2	±2%	200	10	SOD-523	Obsolete	Non-compliant
MM5Z6V2ST1G	onsemi	6.2	±6%	500	10	SOD-523	Active	ROHS3
BZT585B6V2T-7	Diodes Incorporated	6.2	±2%	350	10	SOD-523	Active	ROHS3
BZX585-B6V2,115	Nexperia USA Inc.	6.2	±2%	300	10	SOD-523	Active	ROHS3
BZX585-B6V2,135	Nexperia USA Inc.	6.2	±2%	300	10	SOD-523	Active	ROHS3
EDZVFHT2R6.2B	Rohm Semiconductor	6.2	±2.18%	150	60	SOD-523	Active	ROHS3
PZU6.2B,115	NXP Semiconductors	6.2	±5%	310	30	SOD-323F	Obsolete	Non-compliant
PZU6.2B2,115	Nexperia USA Inc.	6.2	±2%	310	30	SOD-323F	Active	ROHS3

Engineering Selection Recommendations

Direct Package Equivalents (SOD-523):

The MM5Z6V2ST1G from onsemi is the primary direct successor, offering identical package compatibility with increased power rating (500 mW versus 200 mW). This part is active and RoHS3 compliant. The tolerance specification widens to ±6%, which may require circuit validation in precision applications.

The BZT585B6V2T-7 from Diodes Incorporated provides 350 mW power rating with ±2% tolerance matching the original specification. This part maintains the 10 Ohm impedance and is RoHS3 compliant and active.

The BZX585-B6V2,115 and BZX585-B6V2,135 from Nexperia USA Inc. both deliver 300 mW power rating with ±2% tolerance and 10 Ohm impedance. Both variants are active, RoHS3 compliant, and carry AEC-Q100 automotive qualification. These parts are suitable for applications requiring automotive-grade reliability.

The EDZVFHT2R6.2B from Rohm Semiconductor offers 150 mW power rating with ±2.18% tolerance. This part features higher impedance (60 Ohms) and lower reverse leakage current (1 µA @ 3 V). It is active, RoHS3 compliant, and carries AEC-Q101 automotive qualification. This option is appropriate for lower power applications.

Alternative Package Option (SOD-323F):

The PZU6.2B2,115 from Nexperia USA Inc. provides 310 mW power rating in a SOD-323F package with ±2% tolerance. This part is active, RoHS3 compliant, and carries AEC-Q100 automotive qualification. PCB layout modification is required for package transition from SOD-523 to SOD-323F.

Obsolete Parts to Avoid:

The PZU6.2B,115 is obsolete and RoHS non-compliant. This part should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can MM5Z6V2ST1G directly replace MM5Z6V2ST1 in existing designs?

A: Yes, the MM5Z6V2ST1G is a direct package replacement with identical SOD-523 footprint and 6.2 V Zener voltage. The tolerance specification changes from ±2% to ±6%, which requires circuit validation if the design depends on tight voltage tolerance. The increased power rating (500 mW versus 200 mW) provides additional thermal margin.

Q: What is the difference between BZX585-B6V2,115 and BZX585-B6V2,135?

A: Both parts are electrically identical with 6.2 V Zener voltage, 300 mW power rating, ±2% tolerance, and SOD-523 package. The suffix designations (,115 and ,135) indicate different manufacturing or distribution batches. Both are active and RoHS3 compliant with AEC-Q100 automotive qualification.

Q: Why does EDZVFHT2R6.2B have higher impedance (60 Ohms) than other substitutes?

A: The EDZVFHT2R6.2B uses a different semiconductor technology (Rohm's design) that results in higher dynamic impedance. This characteristic affects circuit response to load transients. The lower power rating (150 mW) and lower reverse leakage current (1 µA @ 3 V) make this part suitable for precision, low-power applications where impedance characteristics are acceptable.

Q: Can PZU6.2B2,115 replace MM5Z6V2ST1 without PCB modification?

A: No. The PZU6.2B2,115 uses a SOD-323F package, which has a different footprint than the SOD-523 package of the original part. PCB layout modification is required. However, the electrical specifications (6.2 V Zener voltage, ±2% tolerance, 310 mW power rating) are compatible with the original design intent.

Q: Which substitute offers the best regulatory compliance for automotive applications?

A: The BZX585-B6V2,115, BZX585-B6V2,135, and PZU6.2B2,115 all carry AEC-Q100 automotive qualification and are RoHS3 compliant. The EDZVFHT2R6.2B carries AEC-Q101 qualification. All four parts are active and suitable for automotive-grade designs.

Q: What is the minimum power rating required for a direct replacement?

A: The original MM5Z6V2ST1 is rated at 200 mW. Any substitute with equal or greater power rating (200 mW or higher) is acceptable from a thermal perspective. The BZT585B6V2T-7 (350 mW), MM5Z6V2ST1G (500 mW), BZX585-B6V2,115 (300 mW), BZX585-B6V2,135 (300 mW), and PZU6.2B2,115 (310 mW) all exceed this requirement. The EDZVFHT2R6.2B (150 mW) is below the original rating and requires circuit analysis to confirm suitability.

Q: Is the MM5Z6V2ST1 still available for procurement?

A: The MM5Z6V2ST1 is classified as obsolete. While inventory may exist in distribution channels (954 pieces noted as in stock), new production has ceased. Active alternatives should be selected for new designs and long-term supply security.

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