MM3Z47VB Equivalent & Substitute Parts

Part Overview

The MM3Z47VB is a 47 V Zener diode manufactured by onsemi, rated for 200 mW maximum power dissipation in a surface mount SOD-323F package. This component is designed for voltage regulation and protection applications in electronic circuits. The part is currently active in production with 3,132 units in stock. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative packaging or performance requirements while maintaining functional compatibility within specified electrical parameters.

Substiute Parts

MM3Z47VB

onsemiIn Stock: 3190MM3Z47VB Datasheet

Current PartRFQ

BZT52H-C47,115

Nexperia USA Inc.In Stock: 3720BZT52H-C47,115 Datasheet

SimilarRFQ

BZX384-C47,115

Nexperia USA Inc.In Stock: 21392BZX384-C47,115 Datasheet

SimilarRFQ

BZX585-B47,115

Nexperia USA Inc.In Stock: 2650BZX585-B47,115 Datasheet

SimilarRFQ

BZX585-C47,115

Nexperia USA Inc.In Stock: 4200BZX585-C47,115 Datasheet

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BZX84J-C47,115

Nexperia USA Inc.In Stock: 3972BZX84J-C47,115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM3Z47VB is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Zener voltage (Nominal): 47 V (exact match required)
• Operating temperature range: -65°C to 150°C (minimum requirement)
• Surface mount mounting type
• RoHS3 compliance
• Active product status

Secondary Compatibility Factors:

• Power dissipation rating (equal to or greater than 200 mW)
• Voltage tolerance (±2% or ±5% acceptable)
• Package compatibility (SOD-323F, SOD-323, SOD-123F, or SOD-523)
• Impedance characteristics (170 Ohms or 90 Ohms acceptable)

All identified substitute parts maintain the 47 V nominal zener voltage and operate within the -65°C to 150°C temperature range. Substitutes are available in alternative surface mount packages with equal or higher power ratings, enabling direct functional replacement with potential package footprint modifications.

Parameter Comparison

Engineering Selection Recommendations

BZX585-B47,115 (Nexperia USA Inc.) This substitute provides ±2% tolerance matching the MM3Z47VB with increased power rating (300 mW vs. 200 mW). AEC-Q100 automotive qualification is included. Package change from SOD-323F to SOD-523 requires PCB layout modification. Suitable for applications requiring higher thermal margin and automotive-grade reliability.

BZX384-C47,115 (Nexperia USA Inc.) This substitute maintains SOD-323 package compatibility with the original SOD-323F footprint. Power rating increases to 300 mW with ±5% tolerance. No automotive qualification. Highest inventory availability (21,363 units). Recommended for non-automotive applications where package footprint similarity is prioritized.

BZX585-C47,115 (Nexperia USA Inc.) This substitute offers 300 mW power rating with ±5% tolerance and AEC-Q100 automotive qualification. SOD-523 package requires PCB modification. Suitable for automotive applications with thermal margin requirements.

BZX84J-C47,115 (Nexperia USA Inc.) This substitute provides the highest power rating (550 mW) with SOD-323F package compatibility to the original part. ±5% tolerance and AEC-Q101 automotive qualification included. Recommended for high-power applications or designs requiring maximum thermal headroom.

BZT52H-C47,115 (Nexperia USA Inc.) This substitute offers 375 mW power rating with ±5% tolerance and AEC-Q101 automotive qualification. SOD-123F package represents a significant footprint change. Suitable for automotive applications where package size reduction is acceptable.

Frequently Asked Questions (FAQ)

Q: Can BZX384-C47,115 directly replace MM3Z47VB without PCB modification? A: BZX384-C47,115 uses SOD-323 package while MM3Z47VB uses SOD-323F. Both are similar surface mount packages, but footprint verification against PCB design is required. The SOD-323 package may have minor dimensional differences affecting placement.

Q: What is the significance of the ±2% versus ±5% tolerance difference? A: MM3Z47VB and BZX585-B47,115 maintain ±2% zener voltage tolerance. Other substitutes (BZX384-C47,115, BZX585-C47,115, BZX84J-C47,115, BZT52H-C47,115) operate at ±5% tolerance. Applications requiring tighter voltage regulation should prioritize ±2% tolerance parts.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All identified substitute parts are RoHS3 compliant, matching the compliance status of MM3Z47VB.

Q: Which substitute provides the closest electrical match to MM3Z47VB? A: BZX585-B47,115 provides the closest match with identical ±2% tolerance, matching operating temperature range, and increased power rating (300 mW vs. 200 mW). Primary difference is package change from SOD-323F to SOD-523.

Q: Do automotive-qualified substitutes exist? A: Yes. BZX585-B47,115, BZX585-C47,115, BZX84J-C47,115, and BZT52H-C47,115 all carry automotive qualifications (AEC-Q100 or AEC-Q101). BZX384-C47,115 does not include automotive qualification.

Q: What is the impact of higher power ratings in substitute parts? A: Substitute parts with higher power ratings (300 mW, 375 mW, or 550 mW vs. 200 mW) provide increased thermal margin and can dissipate more heat without exceeding maximum junction temperature. This allows operation in higher-power applications or provides design safety margin in existing applications.

Q: Can BZT52H-C47,115 be used if PCB space is limited? A: BZT52H-C47,115 uses SOD-123F package, which is smaller than SOD-323F. However, this requires complete PCB layout redesign. Verify that the smaller package meets thermal and electrical requirements for your application.

Q: Which substitute has the highest inventory availability? A: BZX384-C47,115 has the highest inventory with 21,363 units in stock, compared to 3,132 units for MM3Z47VB.