MMQA27VT1 Equivalent & Substitute Parts

Part Overview

The MMQA27VT1 is a quad transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 27V reverse standoff voltage rating and is housed in an SC-74 package. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility for new designs and production continuity.

Substiute Parts

MMQA27VT1

onsemiIn Stock: 1006MMQA27VT1 Datasheet

Current PartRFQ

MMQA27VT1G

onsemiIn Stock: 17949MMQA27VT1G Datasheet

DirectRFQ

PESD24VS4UD,115

Nexperia USA Inc.In Stock: 8239PESD24VS4UD,115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MMQA27VT1 is determined by the following critical parameters:

• Package compatibility: SC-74 surface-mount package with quad-channel configuration
• Voltage rating class: Reverse standoff voltage in the 21V–24V range with clamping voltages between 39V–52V
• Channel count: Four independent protection channels
• Compliance status: Active product status with current manufacturing availability
• Environmental specifications: Moisture sensitivity level 1 and RoHS compliance for modern supply chains

The MMQA27VT1G (onsemi) qualifies as a direct equivalent within the same MMQA series, maintaining identical package and channel architecture. The PESD24VS4UD,115 (Nexperia) functions as a functional substitute with comparable voltage ratings and enhanced current handling, though it uses a 6-TSOP package variant and includes automotive-grade qualification.

Parameter Comparison

Engineering Selection Recommendations

MMQA27VT1G is the primary direct substitute. It maintains identical SC-74 packaging and quad-channel architecture within the same MMQA series from onsemi. This part is currently in active production with 17,930 units in stock. It achieves ROHS3 compliance, addressing regulatory requirements that the obsolete MMQA27VT1 does not meet. The electrical parameters (21V standoff, 39V clamp, 615mA peak pulse) are suitable for applications requiring protection in the 27V voltage class.

PESD24VS4UD,115 serves as a functional alternative for designs requiring enhanced current handling (4A vs. 615mA) and higher clamping voltage (52V). This Nexperia component includes AEC-Q100 automotive qualification and operates across a wider temperature range (-65°C to 150°C). The 6-TSOP package differs from the SC-74, requiring PCB layout verification. This option is appropriate for automotive applications or systems demanding higher transient energy absorption.

For new designs, MMQA27VT1G is recommended due to package compatibility and series continuity. For applications with automotive requirements or higher current demands, PESD24VS4UD,115 provides enhanced specifications with appropriate qualification.

Frequently Asked Questions (FAQ)

Q: Can MMQA27VT1G directly replace MMQA27VT1 without PCB modifications?

A: Yes. Both parts use the SC-74 package with identical pinout and quad-channel configuration. No PCB layout changes are required.

Q: What is the primary reason to substitute MMQA27VT1?

A: The MMQA27VT1 is obsolete and no longer manufactured. MMQA27VT1G provides active production availability while maintaining functional equivalence.

Q: Does PESD24VS4UD,115 require PCB redesign?

A: Yes. PESD24VS4UD,115 uses a 6-TSOP package, whereas MMQA27VT1 uses SC-74. PCB footprint and routing must be updated accordingly.

Q: Are both substitutes RoHS compliant?

A: Yes. Both MMQA27VT1G and PESD24VS4UD,115 meet ROHS3 compliance standards. The original MMQA27VT1 is RoHS non-compliant.

Q: Which substitute is suitable for automotive applications?

A: PESD24VS4UD,115 carries AEC-Q100 automotive qualification. MMQA27VT1G is not automotive-qualified.

Q: What is the difference in peak pulse current handling?

A: MMQA27VT1G handles 615mA (8/20µs), while PESD24VS4UD,115 handles 4A (8/20µs). The Nexperia part provides approximately 6.5 times higher transient current capacity.

Q: Are the voltage ratings compatible with the original part?

A: MMQA27VT1G (21V standoff, 39V clamp) and PESD24VS4UD,115 (24V standoff, 52V clamp) both operate within the 27V protection class. Verify specific circuit voltage thresholds before selection.