MMBZ18VALT1 Equivalent & Substitute Parts

Part Overview

The MMBZ18VALT1 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional Zener diode operates with a 14.5V reverse standoff voltage and provides 25V clamping at peak pulse current, dissipating up to 40W during transient events. The part is packaged in SOT-23-3 (TO-236) configuration for compact circuit board integration.

The MMBZ18VALT1 is classified as obsolete. Locating direct replacements from current production inventory is necessary for new designs and ongoing procurement requirements. Active substitute parts maintain identical electrical specifications and mechanical compatibility while offering improved availability and compliance status.

Substiute Parts

MMBZ18VALT1

onsemiIn Stock: 784MMBZ18VALT1 Datasheet

Current PartRFQ

MMBZ18VALT1G

onsemiIn Stock: 125177MMBZ18VALT1G Datasheet

DirectRFQ

MMBZ18VAL,215

Nexperia USA Inc.In Stock: 10383MMBZ18VAL,215 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBZ18VALT1 is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff: 14.5V (typical)
• Voltage - Breakdown (Min): 17.1V
• Voltage - Clamping (Max) @ Ipp: 25V
• Current - Peak Pulse (10/1000µs): 1.6A
• Power - Peak Pulse: 40W
• Package / Case: SOT-23-3 (TO-236)
• Mounting Type: Surface Mount
• Unidirectional Channels: 2
• Operating Temperature Range: -55°C to 150°C

Both identified substitute parts meet all electrical specifications and mechanical requirements. Substitutes differ in manufacturer, product status, compliance certifications, and packaging format, but maintain full functional and pin compatibility with the original part.

Parameter Comparison

Engineering Selection Recommendations

MMBZ18VALT1G (onsemi) is the primary substitute for the obsolete MMBZ18VALT1. Both parts are manufactured by onsemi with identical electrical and mechanical specifications. The MMBZ18VALT1G is in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. This part is supplied in Cut Tape (CT) and Digi-Reel® packaging formats with 125,100 units in current inventory.

MMBZ18VAL,215 (Nexperia USA Inc.) is a secondary substitute offering cross-manufacturer compatibility. Manufactured by Nexperia, this part maintains all critical electrical parameters and SOT-23-3 package compatibility. The MMBZ18VAL,215 carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant. It is supplied in Tape & Reel (TR) format with 10,278 units in inventory. The Nexperia variant includes specified capacitance (70pF @ 1MHz) and automotive qualification, making it suitable for applications requiring automotive-grade components.

Both substitutes are electrically and mechanically interchangeable with the original part. Selection between them depends on supply chain preference, packaging requirements, and whether automotive qualification is required for the application.

Frequently Asked Questions (FAQ)

Q: Can MMBZ18VALT1G be used as a direct replacement for MMBZ18VALT1?

A: Yes. The MMBZ18VALT1G is a direct substitute with identical electrical specifications (14.5V standoff, 17.1V breakdown, 25V clamping, 1.6A peak pulse current) and mechanical compatibility (SOT-23-3 package, surface mount). The primary difference is product status: MMBZ18VALT1G is active production with ROHS3 compliance, while MMBZ18VALT1 is obsolete.

Q: What is the difference between MMBZ18VALT1G and MMBZ18VAL,215?

A: Both parts are electrically equivalent with identical voltage and current ratings. The key differences are manufacturer (onsemi vs. Nexperia), packaging format (Cut Tape/Digi-Reel vs. Tape & Reel), and certifications (MMBZ18VAL,215 includes automotive-grade AEC-Q101 qualification). The Nexperia part also specifies capacitance at 1MHz (70pF).

Q: Are there any package compatibility concerns when substituting these parts?

A: No. All three parts use the SOT-23-3 (TO-236) package with identical pin configuration and mechanical dimensions. They are fully interchangeable at the board level without layout modifications.

Q: Does the MMBZ18VAL,215 automotive qualification affect non-automotive applications?

A: No. Automotive qualification (AEC-Q101) indicates additional testing and quality assurance but does not restrict use in non-automotive applications. The part is suitable for any application requiring the specified electrical characteristics.

Q: What is the significance of the RoHS compliance difference?

A: The original MMBZ18VALT1 is RoHS non-compliant, while both substitutes (MMBZ18VALT1G and MMBZ18VAL,215) are ROHS3 compliant. For new designs and applications subject to RoHS regulations, the compliant substitutes are required.

Q: Can I mix these parts in the same production batch?

A: Yes, provided your application and supply chain procedures permit cross-manufacturer sourcing. All three parts meet identical electrical and mechanical specifications. However, verify that your quality and traceability requirements allow substitution between onsemi and Nexperia sources.