MMBZ18VAL-7 Equivalent & Substitute Parts

Part Overview

The MMBZ18VAL-7 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 14.5V reverse standoff voltage, 25V maximum clamping voltage, and 1.6A peak pulse current capability in a compact SOT-23-3 package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines to maintain design continuity and ensure supply chain availability.

Substiute Parts

MMBZ18VAL-7

Diodes IncorporatedIn Stock: 12242MMBZ18VAL-7 Datasheet

Current PartRFQ

MMBZ18VAL,215

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

MFR RecommendedRFQ

MMBZ18VALT1G

onsemiIn Stock: 125177MMBZ18VALT1G Datasheet

MFR RecommendedRFQ

SZMMBZ18VALT1G

onsemiIn Stock: 22724SZMMBZ18VALT1G Datasheet

MFR RecommendedRFQ

SZMMBZ18VALT3G

onsemiIn Stock: 10747SZMMBZ18VALT3G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBZ18VAL-7 is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 14.5V
• Voltage - Breakdown (Min): 17.1V
• Voltage - Clamping (Max) @ Ipp: 25V
• Current - Peak Pulse (10/1000µs): 1.6A
• Power - Peak Pulse: 40W
• Package / Case: TO-236-3, SC-59, SOT-23-3
• Unidirectional Channels: 2
• Type: Zener

All identified substitute parts maintain identical electrical specifications and package compatibility. Variations in product status, compliance certifications, and temperature operating ranges are noted but do not affect functional interchangeability for the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts maintain full electrical and mechanical compatibility with the MMBZ18VAL-7. Selection among alternatives should be based on the following factors:

Product Availability and Status: MMBZ18VALT1G and SZMMBZ18VALT1G from onsemi offer the highest inventory levels (125,100 and 22,702 units respectively) and active product status, ensuring long-term supply chain continuity. MMBZ18VAL,215 from Nexperia (10,278 units) and SZMMBZ18VALT3G from onsemi (10,728 units) provide secondary sourcing options.

Compliance Requirements: All substitute parts are ROHS3 compliant, addressing modern regulatory requirements. The original MMBZ18VAL-7 is RoHS non-compliant; substitution with any listed alternative improves compliance posture.

Automotive Qualification: MMBZ18VAL,215, SZMMBZ18VALT1G, and SZMMBZ18VALT3G carry AEC-Q101 automotive qualification and automotive grade designation. MMBZ18VALT1G does not specify automotive qualification. Selection of automotive-qualified variants is appropriate for applications requiring automotive-grade components.

Temperature Operating Range: The original part specifies -65°C to 150°C (junction temperature). All substitutes operate across -55°C to 150°C, representing a narrower lower temperature bound. Applications requiring operation below -55°C require design review.

Packaging Format: MMBZ18VALT1G is supplied in Cut Tape & Digi-Reel format. MMBZ18VAL,215, SZMMBZ18VALT1G, and SZMMBZ18VALT3G are supplied in Tape & Reel format. Packaging selection depends on assembly process requirements and volume considerations.

Frequently Asked Questions (FAQ)

Q: Can MMBZ18VAL,215 from Nexperia be used as a direct replacement for MMBZ18VAL-7?

A: Yes. Both parts share identical electrical specifications (14.5V reverse standoff, 17.1V breakdown minimum, 25V clamping maximum, 1.6A peak pulse current, 40W peak power) and are packaged in TO-236-3/SOT-23-3. The Nexperia part is ROHS3 compliant and carries AEC-Q101 automotive qualification, making it suitable for direct substitution.

Q: What is the difference between MMBZ18VALT1G and SZMMBZ18VALT1G from onsemi?

A: Both parts are electrically identical and packaged in SOT-23-3. The primary difference is packaging format: MMBZ18VALT1G is supplied in Cut Tape & Digi-Reel format, while SZMMBZ18VALT1G is supplied in Tape & Reel format. Both carry AEC-Q101 automotive qualification. Selection depends on assembly process compatibility and volume requirements.

Q: Are there temperature operating range differences that affect substitution?

A: The original MMBZ18VAL-7 specifies -65°C to 150°C junction temperature operation. All substitute parts operate across -55°C to 150°C. For applications requiring operation below -55°C, the narrower temperature range of substitutes must be evaluated against design requirements.

Q: Do all substitute parts meet RoHS compliance?

A: Yes. All four substitute parts are ROHS3 compliant. The original MMBZ18VAL-7 is RoHS non-compliant. Substitution with any listed alternative satisfies modern RoHS regulatory requirements.

Q: Which substitute part offers the best supply chain continuity?

A: MMBZ18VALT1G from onsemi provides the highest inventory level (125,100 units) and active product status, offering optimal long-term availability. SZMMBZ18VALT1G (22,702 units) and SZMMBZ18VALT3G (10,728 units) provide secondary sourcing options with active status.

Q: Can these parts be used interchangeably in automotive applications?

A: MMBZ18VAL,215, SZMMBZ18VALT1G, and SZMMBZ18VALT3G carry AEC-Q101 automotive qualification and automotive grade designation. MMBZ18VALT1G does not specify automotive qualification. For automotive applications, selection of AEC-Q101 qualified variants is appropriate.