SZMMQA27VT1G Equivalent & Substitute Parts

Part Overview

The SZMMQA27VT1G is a 4-channel unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for surface mount applications in SC-74 packaging. This automotive-grade component operates across a temperature range of -55°C to 150°C and features a 21V reverse standoff voltage with 39V maximum clamping voltage at peak pulse current. The part is AEC-Q101 qualified and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this TVS diode category.

Substiute Parts

SZMMQA27VT1G

onsemiIn Stock: 2769SZMMQA27VT1G Datasheet

Current PartRFQ

MMQA27VT1G

onsemiIn Stock: 17949MMQA27VT1G Datasheet

DirectRFQ

BZA420A,115

Nexperia USA Inc.In Stock: 12207BZA420A,115 Datasheet

SimilarRFQ

BZA456A,115

Nexperia USA Inc.In Stock: 15343BZA456A,115 Datasheet

SimilarRFQ

BZA456A,135

Nexperia USA Inc.In Stock: 11108BZA456A,135 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of TVS diodes is determined by electrical parameter compatibility within the following criteria:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): Must match or exceed the main part specification
• Voltage - Clamping (Max) @ Ipp: Must be within acceptable tolerance of the main part
• Current - Peak Pulse (10/1000µs): Must meet or exceed the main part specification
• Unidirectional Channels: Must equal 4 channels
• Mounting Type: Must be Surface Mount
• Operating Temperature Range: Must encompass or match the main part range
• Package compatibility: SC-74 or equivalent footprint

Identified Substitute Parts:

Direct Equivalent: MMQA27VT1G (onsemi) — Identical electrical and mechanical specifications with higher inventory availability.

Similar Voltage Class Substitutes: BZA420A,115 and BZA456A variants (Nexperia USA Inc.) — These parts operate in different voltage classes (20V and 5.6V standoff respectively) and are listed as similar alternatives based on the provided substitute list, though they do not meet the primary electrical parameter matching criteria for direct substitution in applications requiring 21V standoff voltage.

Parameter Comparison

Engineering Selection Recommendations

MMQA27VT1G (onsemi) is the direct equivalent substitute for SZMMQA27VT1G. Both parts share identical electrical specifications, operating temperature range, and packaging. The MMQA27VT1G variant offers higher inventory availability (17,930 pcs vs. 2,674 pcs) while maintaining full compliance with ROHS3, MSL 1, and automotive-grade standards. No design modifications are required for this substitution.

BZA420A,115 (Nexperia USA Inc.) operates at 20V reverse standoff with 28V clamping voltage. This part is suitable only for applications where the lower voltage rating is acceptable. It maintains automotive qualification (AEC-Q100) and ROHS3 compliance but represents a different voltage class.

BZA456A,115 and BZA456A,135 (Nexperia USA Inc.) operate at 5.6V reverse standoff with 8V clamping voltage and 3A peak pulse current. These parts are in a significantly lower voltage class and are not suitable for direct substitution in circuits designed for 21V standoff protection. They are listed as similar alternatives only and require circuit re-evaluation for compatibility.

All substitute candidates maintain automotive-grade qualification and ROHS3 compliance. Selection should be based on specific circuit voltage protection requirements and available inventory.

Frequently Asked Questions (FAQ)

Q: Can MMQA27VT1G be used as a direct replacement for SZMMQA27VT1G?

A: Yes. MMQA27VT1G is the direct equivalent with identical electrical parameters (21V standoff, 39V clamping, 615mA peak pulse current), operating temperature range (-55°C to 150°C), and SC-74 surface mount packaging. Both are onsemi products with ROHS3 compliance and MSL 1 rating.

Q: What is the difference between SZMMQA27VT1G and MMQA27VT1G?

A: The primary difference is inventory availability. SZMMQA27VT1G has 2,674 pcs in stock, while MMQA27VT1G has 17,930 pcs. Electrical specifications and packaging are identical.

Q: Can BZA420A,115 replace SZMMQA27VT1G?

A: BZA420A,115 operates at 20V reverse standoff with 28V clamping voltage, compared to the main part's 21V standoff and 39V clamping. This represents a different voltage class and is not a direct substitute. Use only if circuit requirements permit lower voltage protection.

Q: Can BZA456A variants replace SZMMQA27VT1G?

A: No. BZA456A,115 and BZA456A,135 operate at 5.6V reverse standoff with 8V clamping voltage. These are significantly lower voltage devices and are not suitable for applications requiring 21V standoff protection.

Q: Are all substitute parts automotive qualified?

A: Yes. SZMMQA27VT1G is AEC-Q101 qualified. BZA420A,115, BZA456A,115, and BZA456A,135 are all AEC-Q100 qualified. All parts maintain automotive-grade status.

Q: Do all parts use the same package?

A: All parts use SC-74 or SOT-457 surface mount packaging, ensuring mechanical compatibility on PCB layouts designed for the main part.

Q: What is the operating temperature range for each part?

A: SZMMQA27VT1G and MMQA27VT1G operate from -55°C to 150°C. BZA420A,115, BZA456A,115, and BZA456A,135 operate from -65°C to 150°C, providing a wider low-temperature range.