MMQA30VT1G Equivalent & Substitute Parts

Part Overview

The MMQA30VT1G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 30V reverse standoff voltage with a 43.3V maximum clamping voltage and 554mA peak pulse current rating. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

MMQA30VT1G

onsemiIn Stock: 902MMQA30VT1G Datasheet

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MMQA33VT1G

onsemiIn Stock: 35337MMQA33VT1G Datasheet

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ESDA14V2SC6

STMicroelectronicsIn Stock: 119498ESDA14V2SC6 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MMQA30VT1G is determined by the following critical parameters: reverse standoff voltage, breakdown voltage range, clamping voltage, peak pulse current capability, power dissipation rating, package type, and mounting configuration. Substitute parts must maintain functional equivalence within the electrical operating envelope of the original component.

The MMQA30VT1G has been grouped with two substitute options based on these criteria:

Group 1 - Direct Series Equivalent: MMQA33VT1G (onsemi MMQA series) maintains identical package geometry (SC-74), mounting type, channel configuration, and thermal operating range. This part operates within a compatible voltage window with comparable current and power ratings.

Group 2 - Alternative Package Solution: ESDA14V2SC6 (STMicroelectronics ESDA series) provides TVS protection with different voltage and package specifications, suitable only for applications where the lower voltage rating (12V standoff) and alternative package footprint (SOT-23-6) are acceptable.

Parameter Comparison

Engineering Selection Recommendations

MMQA33VT1G is the primary substitute for the MMQA30VT1G. Both components are manufactured by onsemi within the same MMQA series, share identical package geometry and thermal specifications, and maintain compatible electrical performance within the 25V to 30V standoff voltage range. The MMQA33VT1G is currently in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The 5V difference in reverse standoff voltage (25V vs. 30V) and corresponding clamping voltage variance (48.6V vs. 43.3V) must be evaluated against specific circuit protection requirements.

ESDA14V2SC6 is an alternative solution only for applications where the lower voltage rating (12V standoff) is compatible with the protected circuit. This STMicroelectronics component operates in a fundamentally different voltage class and requires package footprint redesign due to SOT-23-6 configuration versus SC-74. Selection of this part is appropriate only when circuit topology and voltage specifications explicitly permit operation at 12V protection levels.

Frequently Asked Questions (FAQ)

Q: Can MMQA33VT1G directly replace MMQA30VT1G without circuit modification?

A: MMQA33VT1G operates within a compatible voltage envelope for most general-purpose TVS applications. The 5V difference in reverse standoff voltage (25V vs. 30V) and 5.3V increase in clamping voltage (48.6V vs. 43.3V) must be evaluated against the specific protected circuit's voltage tolerance. Identical package geometry (SC-74) and thermal range (-55°C to 150°C) enable direct footprint compatibility.

Q: What are the key differences between MMQA33VT1G and ESDA14V2SC6?

A: MMQA33VT1G maintains the same voltage class as the original MMQA30VT1G (25V standoff), while ESDA14V2SC6 operates at 12V standoff—a significantly lower protection threshold. MMQA33VT1G uses SC-74 package; ESDA14V2SC6 requires SOT-23-6 footprint. ESDA14V2SC6 provides higher peak pulse power rating (300W vs. 150W) but operates at reduced temperature range (-40°C to 125°C vs. -55°C to 150°C).

Q: Is package compatibility a factor in substitution?

A: Yes. MMQA30VT1G and MMQA33VT1G both use SC-74 (SOT-457) package, enabling direct PCB footprint compatibility. ESDA14V2SC6 requires SOT-23-6 package, necessitating circuit board redesign and layout modification.

Q: What compliance certifications should be verified for new designs?

A: MMQA33VT1G and ESDA14V2SC6 are both ROHS3 compliant and REACH unaffected. Both carry EAR99 export classification and HTSUS code 8541.10.0080. Moisture sensitivity level is 1 (unlimited) for all three components.

Q: How does operating temperature range affect substitution decisions?

A: MMQA30VT1G and MMQA33VT1G both operate across -55°C to 150°C (junction temperature). ESDA14V2SC6 operates at -40°C to 125°C (ambient temperature), representing a narrower thermal envelope. Applications requiring full -55°C to 150°C operation must use MMQA33VT1G.