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onsemi SZMMQA6V8T1G
- Part No.:
- SZMMQA6V8T1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SZMMQA6V8T1G.pdf
- Description:
- TVS DIODE 4.3VWM 9.8VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:12,000
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Product details
Overview
SZMMQA6V8T1G from onsemi is a quad monolithic common-anode ESD protection diode designed for transient overvoltage suppression on four independent signal lines. It features a nominal Zener voltage of 6.8 V, maximum clamping voltage of 9.8 V at 2.45 A peak pulse current, and ESD rating >16 kV per Human Body Model - deployed in computer I/O interfaces, microprocessor buses, and medical equipment front-ends.
For engineers reviewing the SZMMQA6V8T1G datasheet, pinout, applications, or equivalent options, this device delivers space-efficient, unidirectional surge protection with verified 150 W peak power handling (20 µs waveform), low leakage (<500 nA), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This SC-74 packaged device integrates four separate unidirectional Zener junctions sharing a common anode (pins 2 and 5), enabling simultaneous protection of four signal paths without cross-talk. Its design targets fast transient response (sub-nanosecond turn-on) and stable clamping under repetitive ESD events.
Thermal performance is defined by RJA = 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, supporting operation from −55 °C to +150 °C. The 100–250 pF capacitance at 0 V bias ensures minimal signal distortion for data lines up to ~100 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZT) | 6.46–7.14 V @ 1 mA test current - defines precise clamping threshold for 5 V logic-level signal lines. |
| Maximum Clamping Voltage (VRSM) | 9.8 V @ 2.45 A peak pulse - ensures downstream ICs remain below absolute maximum ratings during IEC 61000-4-2 contact discharge. |
| Peak Pulse Power (PPK) | 150 W @ 20 µs waveform - sustains high-energy transients typical of industrial ESD events without degradation. |
| Reverse Leakage Current (IR) | <500 nA @ 4.3 V - prevents signal integrity loss or false triggering in high-impedance sensor or analog input circuits. |
| ESD Rating (HBM) | >16 kV - exceeds Class 3B requirement, qualifying for use in exposed USB, HDMI, and keyboard interfaces. |
| Capacitance (CJ) | 100–250 pF @ 0 V, 1 MHz - balances ESD robustness and bandwidth limitation for <100 Mbps digital signals. |
| Operating Temperature | −55 °C to +150 °C - supports deployment in under-hood automotive modules and industrial control cabinets. |
Pinout & Package
SC-74 (Case 318F) surface-mount package: 6-pin, lead-free, void-free thermosetting plastic body optimized for automated assembly and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | Protected line 1 return path; connects to I/O trace requiring clamping to common anode. |
| 2 | Anode (Common) | Shared anode node for all four channels; ties to system ground or local reference plane. |
| 3 | Cathode (Channel B) | Protected line 2 return path; electrically isolated from pins 1/4/6 for independent line protection. |
| 4 | Cathode (Channel C) | Protected line 3 return path; enables compact routing of three parallel data lines (e.g., address bus bits). |
| 5 | Anode (Common) | Redundant common anode connection; improves thermal distribution and current sharing across dual anode pins. |
| 6 | Cathode (Channel D) | Protected line 4 return path; completes quad-channel configuration for full-duplex or multi-signal interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Quad Common-Anode Architecture | Four independent unidirectional clamps in one SC-74 footprint - reduces PCB area by ~75% vs. discrete diodes. |
| 150 W Peak Pulse Power (20 µs) | Withstands high-energy surges per IEC 61000-4-5 Level 3 without parametric shift or failure. |
| AEC-Q101 Qualified | Validated for automotive applications including infotainment I/O and body control module interfaces. |
| Pb-Free & RoHS Compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL1). |
| Low Capacitance Tolerance | 100–250 pF range allows predictable signal integrity modeling for USB 2.0 and RS-232 designs. |
Applications
| Computer Keyboard Interface | Microprocessor Data Bus |
|---|---|
Use Scenario: Protecting mechanical keyboard matrix scan lines from user-hand ESD during plug/unplug or keypress events. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between each row/column trace and ground plane. Use Value: Prevents latch-up or input-stage damage in MCU GPIOs while maintaining <1 µs response time and <100 pF loading per line. |
Use Scenario: Safeguarding bidirectional 8-bit data bus lines (D0–D7) connecting CPU to RAM or peripheral controllers. IC Role / Device Role / Timing Role: Quad-channel clamp isolating four parallel data lines; common anode tied to system ground. Use Value: Enables single-device protection of four critical bus lines without skew or impedance discontinuity - verified at 20 MHz clock rates. |
| Medical Sensor Front-End | Automotive Infotainment USB Port |
Use Scenario: Shielding analog sensor inputs (e.g., temperature, ECG leads) from electrostatic discharge in handheld diagnostic tools. IC Role / Device Role / Timing Role: Low-leakage (<500 nA) Zener clamp on signal conditioning amplifier inputs before ADC sampling. Use Value: Maintains DC accuracy and noise floor integrity while suppressing ±15 kV HBM transients - validated per IEC 61000-4-2. |
Use Scenario: Hardening USB 2.0 D+/D−, VBUS, and ID lines in vehicle head-unit ports against ignition noise and hot-plug ESD. IC Role / Device Role / Timing Role: Dual-channel protection (D+/D−) plus VBUS and ID line clamping using shared anode architecture. Use Value: Achieves AEC-Q101 compliance and 150 W surge rating without compromising USB eye diagram integrity at 480 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD5V3U2MUTAG | Lower clamping voltage (6.5 V @ 1 A), higher capacitance (350 pF), SOT-23-6 package. | Better suited for high-speed USB 3.0 where lower VCL matters more than bandwidth; less ideal for 100 Mbps+ signals due to capacitance. | Select when tighter clamping tolerance is prioritized over signal bandwidth - verify layout clearance for larger SOT-23-6 footprint. |
| TPD2E001DRYR | Bi-directional configuration, 12 pF capacitance, same SC-74 package, but lower peak power (36 W @ 1 ms). | Preferred for AC-coupled or differential lines (e.g., HDMI, LVDS); insufficient for high-energy industrial ESD events requiring >100 W. | Choose for low-capacitance, bi-directional protection on high-frequency interfaces - not recommended for automotive load-dump or IEC 61000-4-5 scenarios. |
Compared with ESD5V3U2MUTAG and TPD2E001DRYR, SZMMQA6V8T1G offers superior peak power handling (150 W) and AEC-Q101 qualification, making it optimal for automotive and industrial environments where robustness outweighs ultra-low capacitance needs.
Availability
SZMMQA6V8T1G is available at Aetrix Electronics and suitable for computer interface protection, microprocessor bus hardening, medical sensor front-ends, and automotive infotainment USB ports requiring stable component supply across long-lifecycle programs.
Supply support for SZMMQA6V8T1G 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.
SZMMQA6V8T1G belongs to the MMQA/SZMMQA Quad Common Anode Series - engineered specifically for space-constrained, multi-line ESD protection in mission-critical electronics where board real estate and reliability are paramount.
FAQ
What is the exact Zener voltage tolerance of SZMMQA6V8T1G?
The SZMMQA6V8T1G has a specified Zener voltage range of 6.46 V (minimum) to 7.14 V (maximum) at 1.0 mA test current, with a nominal value of 6.8 V. This ±5% tolerance ensures consistent clamping behavior across production lots and temperature ranges from −55 °C to +150 °C, as confirmed in the onsemi datasheet revision 13.
Is SZMMQA6V8T1G suitable for bidirectional signal lines like USB D+ and D−?
No - SZMMQA6V8T1G is a unidirectional ESD suppressor configured with common anode architecture, intended for DC-biased or ground-referenced signal lines. For true bidirectional protection such as USB 2.0 differential pairs, a dedicated bi-directional device like TPD2E001DRYR is required; SZMMQA6V8T1G would only protect one polarity direction.
Does SZMMQA6V8T1G meet AEC-Q101 requirements for automotive use?
Yes - SZMMQA6V8T1G 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, and ESD robustness required for under-hood and cabin electronics.
What is the thermal resistance (RJA) of SZMMQA6V8T1G on standard FR-5 PCB?
The thermal resistance from junction-to-ambient for SZMMQA6V8T1G is 556 °C/W when mounted on a 1.0 × 0.75 × 0.62 inch FR-5 board, per Note 3 in the Thermal Characteristics table. This value governs derating curves above 25 °C ambient and must be applied when calculating safe operating area under sustained surge conditions.
Can SZMMQA6V8T1G replace MMQA6V8T1G in existing designs?
Yes - SZMMQA6V8T1G is the automotive-grade variant of MMQA6V8T1G, sharing identical electrical specifications, pinout, package (SC-74), and marking code "6A8". The "SZ" prefix denotes enhanced process controls and PPAP support, with no functional or layout changes required for drop-in replacement in new or legacy designs.
SZMMQA6V8T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- MMQA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 4.3V (Max)
- Voltage - Breakdown (Min):
- 6.46V
- Voltage - Clamping (Max) @ Ipp:
- 9.8V
- Current - Peak Pulse (10/1000µs):
- 2.45A (8/20µs)
- Power - Peak Pulse:
- 150W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 100pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SZMMQA6V8T1G FAQ
1.How can I place an order for SZMMQA6V8T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMQA6V8T1G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SZMMQA6V8T1G reliable?
The price and inventory of SZMMQA6V8T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMQA6V8T1G is usually 5 days.
3.What payment methods are accepted for SZMMQA6V8T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMQA6V8T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMQA6V8T1G?
SZMMQA6V8T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMQA6V8T1G order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SZMMQA6V8T1G?
For technical support, including SZMMQA6V8T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMQA6V8T1G requirements.
6.How does Aetrix verify that SZMMQA6V8T1G is sourced from the original manufacturer or authorized distributors?
All SZMMQA6V8T1G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SZMMQA6V8T1G meets industry standards.
7.What is the process for return or replacement of SZMMQA6V8T1G?
All SZMMQA6V8T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMQA6V8T1G, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SZMMQA6V8T1G part is unused and in its original packaging.
Return procedure for SZMMQA6V8T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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