MMBZ33VAL-7 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The MMBZ33VAL-7 is a unidirectional Zener TVS diode manufactured by Diodes Incorporated, designed for transient voltage suppression in general-purpose applications. This component features a 26V reverse standoff voltage, 46V maximum clamping voltage, and 870mA peak pulse current capability in a surface-mount SOT-23-3 package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and supply chain reliability.

Substiute Parts

MMBZ33VAL-7

Diodes IncorporatedIn Stock: 3510MMBZ33VAL-7 Datasheet

Current PartRFQ

MMBZ33VAL,215

Nexperia USA Inc.In Stock: 33467MMBZ33VAL,215 Datasheet

MFR RecommendedRFQ

MMBZ33VALT1G

onsemiIn Stock: 305300MMBZ33VALT1G Datasheet

MFR RecommendedRFQ

SZMMBZ33VALT1G

onsemiIn Stock: 105470SZMMBZ33VALT1G Datasheet

MFR RecommendedRFQ

SZMMBZ33VALT3G

onsemiIn Stock: 28633SZMMBZ33VALT3G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBZ33VAL-7 is determined by strict equivalence across the following critical parameters:

• Voltage Rating: Reverse standoff voltage of 26V (typical), breakdown voltage minimum of 31.35V, and maximum clamping voltage of 46V
• Current Handling: Peak pulse current of 870mA at 10/1000µs pulse width
• Power Dissipation: Peak pulse power of 40W
• Package Compatibility: Surface-mount SOT-23-3 (TO-236-3, SC-59) footprint
• Diode Type: Unidirectional Zener configuration with 2 channels
• Electrical Characteristics: All substitute parts maintain identical voltage and current specifications

All identified substitute parts meet these criteria without deviation. Packaging format (tape & reel versus cut tape) and manufacturer differences do not affect electrical equivalence.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MMBZ33VALT1G (onsemi)

This part is the direct electrical equivalent with active product status, ROHS3 compliance, and extensive inventory availability (305,200 units). It maintains identical voltage and current specifications while offering improved supply chain continuity. The SOT-23-3 package is footprint-compatible with the original design.

Secondary Recommendation: MMBZ33VAL,215 (Nexperia)

This substitute provides equivalent electrical performance with active status and ROHS3 compliance. The TO-236AB package designation represents the same physical footprint as SOT-23-3. Inventory availability is substantial (33,360 units).

Automotive-Grade Options: SZMMBZ33VALT1G and SZMMBZ33VALT3G (onsemi)

Both parts are AEC-Q101 qualified and ROHS3 compliant, suitable for applications requiring automotive-grade components. Electrical specifications are identical to the original part. SZMMBZ33VALT1G offers higher inventory (105,400 units) compared to SZMMBZ33VALT3G (28,526 units).

Compliance Consideration:

The original MMBZ33VAL-7 is RoHS non-compliant. All substitute parts are ROHS3 compliant, representing an improvement in regulatory alignment for new designs or production runs.

Frequently Asked Questions (FAQ)

Q: Can MMBZ33VALT1G be used as a direct replacement for MMBZ33VAL-7?

A: Yes. Both parts are unidirectional Zener TVS diodes with identical voltage ratings (26V standoff, 31.35V breakdown minimum, 46V clamping maximum), current handling (870mA peak pulse), and power dissipation (40W). The SOT-23-3 package is footprint-compatible. The primary difference is product status: MMBZ33VALT1G is active while MMBZ33VAL-7 is discontinued.

Q: What is the difference between MMBZ33VAL,215 and MMBZ33VALT1G?

A: Both are electrically equivalent with identical voltage and current specifications. The primary differences are manufacturer (Nexperia versus onsemi) and packaging format (Tape & Reel versus Cut Tape & Digi-Reel). Electrical performance and PCB footprint compatibility are identical.

Q: Are the automotive-grade parts (SZMMBZ33VALT1G and SZMMBZ33VALT3G) necessary for non-automotive applications?

A: No. AEC-Q101 qualification is not required for general-purpose applications. The standard MMBZ33VALT1G provides equivalent electrical performance at potentially lower cost. Automotive-grade parts are specified only when design requirements explicitly mandate AEC-Q101 compliance.

Q: Does the operating temperature range difference affect substitution?

A: The original part specifies -65°C to 150°C (junction temperature). Substitute parts specify -55°C to 150°C (ambient or junction temperature). For applications operating below -55°C, verify that the substitute part's temperature rating meets system requirements. For standard industrial and commercial applications within -55°C to 150°C, substitution is valid.

Q: What is the impact of RoHS compliance differences?

A: The original MMBZ33VAL-7 is RoHS non-compliant. All substitute parts are ROHS3 compliant. For new designs or production runs subject to RoHS regulations, substitute parts provide regulatory alignment. Existing designs using the original part may continue operation without modification; however, future procurement should transition to ROHS3-compliant alternatives.

Q: Are there any package or pinout differences between these parts?

A: No. All parts use the SOT-23-3 (TO-236-3, SC-59) package with identical pinout and footprint. PCB layout modifications are not required for substitution.