MMQA30VT1 Equivalent & Substitute Parts

Part Overview

The MMQA30VT1 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 (8/20µs). The device is housed in an SC-74 (SOT-457) package and operates across a temperature range of -55°C to 150°C.

The MMQA30VT1 is classified as obsolete, making equivalent or substitute components necessary for new designs and ongoing production requirements. Identifying compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

MMQA30VT1

onsemiIn Stock: 1270MMQA30VT1 Datasheet

Current PartRFQ

ESDA6V1SC6

STMicroelectronicsIn Stock: 79946ESDA6V1SC6 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of TVS diodes is determined by strict alignment of electrical protection parameters and physical compatibility. The primary criteria for identifying suitable alternatives to the MMQA30VT1 are:

Critical Substitution Parameters:

• Voltage rating class (reverse standoff voltage and breakdown voltage range)
• Peak pulse current handling capability
• Package form factor and pin configuration
• Unidirectional channel configuration
• Operating temperature range compatibility
• RoHS and regulatory compliance status

The ESDA6V1SC6 operates in a fundamentally different voltage protection class (5.25V reverse standoff versus 30V), making it unsuitable as a direct functional equivalent for the MMQA30VT1. This substitute addresses different circuit protection requirements and cannot be interchanged in applications requiring 30V-class overvoltage suppression.

Parameter Comparison

Engineering Selection Recommendations

The MMQA30VT1 is an obsolete component, necessitating alternative sourcing strategies. When evaluating substitutes, the following factors apply:

Product Status Consideration: The ESDA6V1SC6 maintains active production status with STMicroelectronics, ensuring long-term availability and supply chain stability compared to the obsolete MMQA30VT1.

Regulatory Compliance: The ESDA6V1SC6 is ROHS3 compliant, whereas the MMQA30VT1 is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, the ESDA6V1SC6 provides compliance alignment.

Voltage Class Mismatch: The ESDA6V1SC6 operates at 5.25V reverse standoff voltage, which is incompatible with circuits requiring 30V protection. Direct substitution is not feasible for applications protecting 30V signal lines or power rails. Alternative 30V-class TVS diodes from active manufacturers must be sourced for functional equivalence.

Package Compatibility: The MMQA30VT1 uses SC-74 (SOT-457) packaging, while the ESDA6V1SC6 uses SOT-23-6. PCB layout modifications are required if substitution is attempted.

Frequently Asked Questions (FAQ)

Q: Can the ESDA6V1SC6 directly replace the MMQA30VT1 in existing designs?

A: No. The ESDA6V1SC6 operates at 5.25V reverse standoff voltage, while the MMQA30VT1 is rated for 30V. These components protect different voltage classes and are not functionally interchangeable. Direct substitution will result in inadequate overvoltage protection for 30V circuits.

Q: What is the primary reason for seeking alternatives to the MMQA30VT1?

A: The MMQA30VT1 is classified as obsolete, making it unavailable through standard distribution channels. New designs and production continuity require sourcing from active manufacturers.

Q: Are there package compatibility considerations between these parts?

A: Yes. The MMQA30VT1 uses SC-74 (SOT-457) packaging with a specific pin configuration, while the ESDA6V1SC6 uses SOT-23-6. These packages are physically and electrically distinct, requiring PCB redesign for any substitution attempt.

Q: What compliance advantages does the ESDA6V1SC6 offer?

A: The ESDA6V1SC6 is ROHS3 compliant, whereas the MMQA30VT1 is RoHS non-compliant. For applications subject to RoHS directives or customer environmental requirements, the ESDA6V1SC6 provides regulatory alignment.

Q: How do the operating temperature ranges compare?

A: The MMQA30VT1 operates from -55°C to 150°C (junction temperature), while the ESDA6V1SC6 operates from -40°C to 125°C (ambient temperature). The MMQA30VT1 supports a wider temperature range, which may be critical for extreme-environment applications.

Q: What should be considered when sourcing a true equivalent for the MMQA30VT1?

A: A functional equivalent must maintain 30V reverse standoff voltage, 4-channel unidirectional configuration, SC-74 package compatibility, and comparable peak pulse current and power ratings. The component should be sourced from an active manufacturer to ensure supply chain continuity and regulatory compliance.