MM5Z8V2ST1 Zener Diode 8.2V 200mW SOD-523 Equivalent & Substitute Parts

Part Overview

The MM5Z8V2ST1 is a surface mount Zener diode manufactured by onsemi, rated at 8.2 V nominal with 200 mW maximum power dissipation in SOD-523 packaging. This component is classified as obsolete product status. Due to its obsolete designation and limited availability relative to active alternatives, equivalent substitute parts with matching or superior electrical characteristics are necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	8.2	V
Tolerance	±2%	—
Power - Max	200	mW
Impedance (Max)	15	Ohms
Current - Reverse Leakage @ Vr	700	nA @ 5 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-523	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the MM5Z8V2ST1 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 8.2 V (exact match required)
Tolerance: ±2% (equivalent tolerance acceptable)
Mounting Type: Surface Mount
Package / Case: SOD-523 (mechanical compatibility)

Secondary Compatibility Criteria:

Power - Max: Equal to or greater than 200 mW
Impedance (Max): 15 Ohms or lower
Current - Reverse Leakage @ Vr: 700 nA @ 5 V or lower
Operating Temperature Range: Must encompass -65°C to 150°C

Substitute parts are grouped into two categories: Direct Upgrades (higher power rating, same package) and Functional Equivalents (matching electrical performance, alternative packages acceptable for space-constrained applications).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Package	Product Status	RoHS
MM5Z8V2ST1	onsemi	8.2 V	±2%	200 mW	15 Ω	700 nA @ 5 V	SOD-523	Obsolete	Non-compliant
MM5Z8V2ST1G	onsemi	8.2 V	±2%	500 mW	15 Ω	700 nA @ 5 V	SOD-523	Active	ROHS3 Compliant
BZT585B8V2T-7	Diodes Incorporated	8.2 V	±2%	350 mW	10 Ω	700 nA @ 5 V	SOD-523	Active	ROHS3 Compliant
BZX585-B8V2,115	Nexperia USA Inc.	8.2 V	±2%	300 mW	10 Ω	700 nA @ 5 V	SOD-523	Active	ROHS3 Compliant
BZX585-B8V2,135	Nexperia USA Inc.	8.2 V	±2%	300 mW	10 Ω	700 nA @ 5 V	SOD-523	Active	ROHS3 Compliant
EDZVFHT2R8.2B	Rohm Semiconductor	8.2 V	±2.07%	150 mW	30 Ω	500 nA @ 5 V	EMD2	Active	ROHS3 Compliant
PZU8.2B2,115	Nexperia USA Inc.	8.2 V	±2%	310 mW	10 Ω	500 nA @ 5 V	SOD-323F	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitute: MM5Z8V2ST1G

The MM5Z8V2ST1G from onsemi is the optimal direct replacement. It maintains identical electrical specifications (8.2 V, ±2% tolerance, SOD-523 package) while providing 500 mW power rating versus the original 200 mW. This part is in active product status with ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original MM5Z8V2ST1.

Recommended Secondary Substitutes: BZX585-B8V2,115 and BZX585-B8V2,135

Both Nexperia parts deliver 300 mW power dissipation in SOD-523 packaging with 8.2 V nominal voltage and ±2% tolerance. These components feature lower impedance (10 Ω maximum) and are AEC-Q101/AEC-Q100 qualified for automotive applications. Both are in active status with ROHS3 compliance.

Alternative Substitute: BZT585B8V2T-7

The Diodes Incorporated BZT585B8V2T-7 provides 350 mW in SOD-523 with 10 Ω maximum impedance. This part is active and ROHS3 compliant, offering intermediate power capability between the original specification and higher-rated alternatives.

Limited Compatibility Option: PZU8.2B2,115

The Nexperia PZU8.2B2,115 matches electrical performance (8.2 V, ±2%, 310 mW) but uses SOD-323F packaging instead of SOD-523. This part is suitable only for designs where package footprint differences are acceptable. It is AEC-Q100 qualified and ROHS3 compliant.

Not Recommended: EDZVFHT2R8.2B

The Rohm EDZVFHT2R8.2B has insufficient power rating (150 mW versus 200 mW required) and higher impedance (30 Ω maximum versus 15 Ω). While AEC-Q101 qualified and ROHS3 compliant, it does not meet the minimum power dissipation requirement for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can MM5Z8V2ST1G be used as a direct drop-in replacement for MM5Z8V2ST1?

A: Yes. Both parts share identical electrical specifications (8.2 V nominal, ±2% tolerance, 15 Ω maximum impedance) and SOD-523 packaging. The MM5Z8V2ST1G provides higher power rating (500 mW versus 200 mW), making it a superior direct replacement. No circuit modifications are required.

Q: What is the difference between BZX585-B8V2,115 and BZX585-B8V2,135?

A: Both parts are electrically identical (8.2 V, ±2%, 300 mW, SOD-523). The suffix designations indicate different qualification levels: BZX585-B8V2,115 is AEC-Q101 qualified, while BZX585-B8V2,135 is AEC-Q100 qualified. Selection depends on automotive qualification requirements for your application.

Q: Why is EDZVFHT2R8.2B not recommended as a substitute?

A: The EDZVFHT2R8.2B has a maximum power rating of 150 mW, which is below the original MM5Z8V2ST1 specification of 200 mW. Additionally, its impedance is 30 Ω maximum, exceeding the 15 Ω limit of the original part. This component cannot reliably handle the same thermal and electrical loads.

Q: Can PZU8.2B2,115 be used if SOD-523 packaging is not available?

A: PZU8.2B2,115 is electrically compatible (8.2 V, ±2%, 310 mW) but uses SOD-323F packaging instead of SOD-523. Substitution is possible only if the PCB layout can accommodate the different footprint. Verify mechanical compatibility with your board design before selection.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitutes (MM5Z8V2ST1G, BZT585B8V2T-7, BZX585-B8V2,115, BZX585-B8V2,135, PZU8.2B2,115) are ROHS3 compliant. The original MM5Z8V2ST1 is RoHS non-compliant. Compliance is mandatory for new designs and procurement in regulated markets.

Q: What is the impedance difference between substitute parts, and does it matter?

A: Impedance values range from 10 Ω (Nexperia and Diodes parts) to 30 Ω (Rohm part). Lower impedance provides better voltage regulation and faster transient response. For general applications, 10 Ω to 15 Ω impedance is functionally equivalent. The 30 Ω impedance of EDZVFHT2R8.2B represents a significant deviation and is not recommended.

Q: Which substitute has the lowest reverse leakage current?

A: PZU8.2B2,115 and EDZVFHT2R8.2B both specify 500 nA @ 5 V reverse leakage, compared to 700 nA @ 5 V for the original and most other substitutes. This difference is negligible for most applications and should not be the primary selection criterion.

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