onsemi SZMMQA6V2T1G

Overview

SZMMQA6V2T1G from onsemi is a quad monolithic common-anode ESD protection diode in SC-74 package, designed for transient overvoltage suppression on four independent signal lines. It features 6.2 V nominal Zener voltage, ≤700 nA reverse leakage at 4.0 V, 9.0 V maximum clamping voltage at 2.66 A surge current, and 150 W peak pulse power (20 µs waveform), ideal for space-constrained I/O protection in communication interfaces.

For engineers reviewing the SZMMQA6V2T1G datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional clamping performance, SC-74 footprint compatibility, Class 3B HBM ESD rating (>16 kV), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This device implements a quad-junction common-anode architecture where Pin 2 and Pin 5 serve as shared anodes, and Pins 1/3/4/6 are individual cathodes-enabling four independent unidirectional TVS paths in one SC-74 package. Each channel operates with tight Zener voltage tolerance (±5% around 6.2 V) and low dynamic impedance (300 Ω max at test current).

Thermal design is supported by 556 °C/W junction-to-ambient resistance on FR-5 board and 417 °C/W on alumina substrate, enabling sustained 225 mW or 300 mW dissipation respectively at 25 °C ambient. Derating curves confirm stable operation across −55 °C to +150 °C junction temperature range.

Key Specifications

Pinout & Package

SC-74 package (Case 318F, Style 1) is a 6-pin small-outline surface-mount package with gull-wing leads, optimized for automated assembly and high-density PCB layouts. Its compact dimensions (2.2 mm × 1.35 mm × 0.95 mm) enable placement near connectors and I/O ports.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ESD protection applications.

Compared with SZMMQA6V2T1G, SZMMQA6V8T1G offers higher DC blocking margin but lower surge current capacity, while ESD5V3U2U-2/TR delivers comparable per-channel clamping at the cost of quadrupled placement area and no shared-anode efficiency.

Availability

SZMMQA6V2T1G is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial serial communication ports, and medical keypad interfaces requiring stable component supply and AEC-Q101-compliant ESD protection.

Supply support for SZMMQA6V2T1G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

SZMMQA6V2T1G belongs to the MMQA/SZMMQA Quad Common Anode Series-engineered specifically for high-density, multi-line ESD protection in space-constrained consumer, automotive, and industrial electronics.

FAQ

What is the exact Zener voltage tolerance of SZMMQA6V2T1G?

The SZMMQA6V2T1G has a specified breakdown voltage range of 5.89 V to 6.51 V at 1.0 mA test current, representing a ±5% tolerance around the nominal 6.2 V value. This tight tolerance ensures consistent clamping behavior across production lots and operating temperatures, critical for reliable protection of 5 V or 3.3 V I/O rails where overvoltage margin is constrained.

Is SZMMQA6V2T1G suitable for bidirectional signal lines like USB D+ and D−?

SZMMQA6V2T1G is configured as a unidirectional TVS diode array with common anodes (Pins 2 and 5). For true bidirectional protection on differential pairs, it must be used in conjunction with a series resistor or paired with a complementary device-its architecture clamps positive transients to ground but does not suppress negative excursions below ground. Designers should verify signal swing limits and consider layout symmetry when applying SZMMQA6V2T1G to USB lines.

Does SZMMQA6V2T1G meet AEC-Q101 requirements for automotive use?

Yes, SZMMQA6V2T1G carries the "SZ" prefix indicating automotive qualification, and the datasheet explicitly states it is AEC-Q101 qualified and PPAP capable. This includes stress testing for temperature cycling, humidity bias, mechanical shock, and ESD-validating its suitability for under-dash, infotainment, and body electronics applications where reliability under thermal and vibration stress is mandatory.

What is the maximum surge current SZMMQA6V2T1G can handle?

SZMMQA6V2T1G supports a maximum non-repetitive peak reverse surge current (I_RSM) of 2.66 A under the 8 × 20 µs waveform (Figure 6), corresponding to its 9.0 V clamping voltage. At the shorter 10 × 1000 µs waveform (Figure 5), it handles 3.0 A with 8.0 V clamping. These values are measured per JEDEC standards and define the absolute safe operating limit before parametric shift or failure.

How does the SC-74 package of SZMMQA6V2T1G compare to SOT-23-6 in layout terms?

The SC-74 (Case 318F) package used by SZMMQA6V2T1G measures 2.2 mm × 1.35 mm with 0.65 mm lead pitch-identical in footprint and soldering profile to standard SOT-23-6. This allows direct drop-in replacement in existing SOT-23-6 layouts without redesign, while delivering quad-channel functionality versus typical dual- or triple-channel SOT-23-6 TVS arrays.