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onsemi MMQA6V8T1G
- Part No.:
- MMQA6V8T1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
MMQA6V8T1G.pdf
- Description:
- TVS DIODE 4.3VWM 9.8VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:3,204
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Product details
Overview
MMQA6V8T1G 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 a nominal Zener voltage of 6.8 V, maximum clamping voltage of 9.8 V at 2.45 A surge current, and ESD rating >16 kV per Human Body Model (HBM Class 3B), used in USB, keyboard, and microprocessor I/O line protection.
For engineers reviewing the MMQA6V8T1G datasheet, pinout, applications, or equivalent options, this device offers verified unidirectional surge protection with 24 W peak power (1 ms), low leakage (<500 nA), and compact quad-line integration ideal for space-constrained PCBs in computing and communication systems.
Technical Context
The MMQA6V8T1G implements a monolithic silicon quad-junction structure with shared anode (pins 2 and 5), enabling four independent cathode-anode paths (pins 1–2, 3–2, 4–5, 6–5) for simultaneous protection of four signal lines. Its unidirectional configuration supports DC-biased interfaces requiring reverse-polarity blocking and fast clamping response.
Thermal performance is defined for FR-5 board (RJA = 556 °C/W, PD = 225 mW) and alumina substrate (RJA = 417 °C/W, PD = 300 mW), with junction temperature range from −55 °C to +150 °C and Pb-free RoHS-compliant packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.46–7.14 V @ IZT = 1.0 mA - defines precise clamping threshold for 6.8 V nominal rail protection |
| Clamping Voltage (VRSM) | 9.8 V @ IRSM = 2.45 A - limits transient-induced overvoltage during 8/20 µs surge events |
| Peak Pulse Power | 150 W @ 20 µs waveform - sustains high-energy ESD transients without failure |
| Reverse Leakage (IR) | <500 nA @ VR = 4.3 V - ensures minimal signal loading and power loss in standby |
| ESD Rating (HBM) | >16 kV - exceeds IEC 61000-4-2 Level 4 immunity requirements for user-accessible ports |
| Junction Capacitance | 100–250 pF @ 0 V - balances ESD robustness and high-speed signal integrity for ≤10 Mbps interfaces |
| Operating Temperature | −55 °C to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
SC-74 (Case 318F) surface-mount package: 6-pin, small-outline, Pb-free, tape-and-reel compatible (3,000 units/reel). Designed for automated placement and reflow soldering on high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Channel A) | Protected line input for first unidirectional path; connects to signal trace needing clamp-to-ground |
| Pin 2 | Anode (Common Anode A) | Shared anode node for Channels A, B, and C; ties to system ground or bias reference |
| Pin 3 | Cathode (Channel B) | Protected line input for second unidirectional path; electrically isolated from Pin 1 |
| Pin 4 | Cathode (Channel C) | Protected line input for third unidirectional path; shares Pin 2 anode with Pins 1 and 3 |
| Pin 5 | Anode (Common Anode B) | Second shared anode node for Channel D; enables dual-anode architecture for flexible routing |
| Pin 6 | Cathode (Channel D) | Protected line input for fourth unidirectional path; uses Pin 5 as dedicated return |
Key Features
| Feature | Design Value |
|---|---|
| Quad Common-Anode Architecture | Four independent ESD paths in one SC-74 footprint - reduces component count and PCB area by 75% vs. discrete diodes |
| High-Energy Surge Handling | 150 W peak pulse power (20 µs) - protects against IEC 61000-4-5 surges and contact ESD events |
| Low-Leakage Protection | <500 nA reverse current at 4.3 V - preserves battery life and avoids false triggering in low-power sensor interfaces |
| HBM Class 3B Compliance | >16 kV ESD withstand - meets stringent end-equipment requirements for USB, HDMI, and keypad interfaces |
| Pb-Free & RoHS Compliant | Lead-free terminations and halogen-free molding compound - satisfies global environmental compliance mandates |
Applications
| USB 2.0 Data Lines | Keyboard/Mouse Interface |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in embedded USB peripherals against ESD discharge during plug/unplug cycles. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between data lines and chassis ground, clamping fast-rising HBM pulses before they reach PHY IC. Use Value: Maintains signal integrity up to 480 Mbps while limiting voltage excursion to ≤9.8 V, preventing latch-up or damage to USB transceivers. |
Use Scenario: Shielding matrix scan lines and interrupt lines in industrial keyboards from operator-induced ESD events. IC Role / Device Role / Timing Role: Quad-channel line protector with shared anodes routing all key scan outputs to common ground plane. Use Value: Eliminates need for four separate SOD-323 diodes, reducing layout area by >60% and simplifying BOM management. |
| Microprocessor I/O Bus | Printer Parallel Port |
Use Scenario: Safeguarding address/data/control bus lines (e.g., A0–A15, D0–D7, RD/WR) in legacy microcontroller-based systems. IC Role / Device Role / Timing Role: Low-capacitance (100–250 pF) clamp diode array tied to VSS, providing sub-1 ns response to transients on bidirectional buses. Use Value: Prevents data corruption and reset glitches during ESD events without degrading rise/fall times of 5 V TTL-level signals. |
Use Scenario: Hardening Centronics-style parallel port pins (STROBE, ACK, BUSY, DATA0–DATA7) against electrostatic discharge in office printers. IC Role / Device Role / Timing Role: Four-channel protection for critical control lines plus eight data lines - MMQA6V8T1G covers control subset, paired with additional arrays. Use Value: Enables single-package protection of timing-critical handshake signals, ensuring reliable handshaking even after repeated 15 kV contact discharges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA6V8T1G | AEC-Q101 qualified, PPAP-capable, identical electrical specs and pinout - differs only in automotive-grade traceability and process controls | Required for automotive infotainment I/O protection where qualification documentation and lot traceability are mandatory | Select SZMMQA6V8T1G when automotive OEM compliance (e.g., Tier-1 supply chain) is required; otherwise MMQA6V8T1G suffices for industrial/commercial use |
| MMQA6V2T1G | Lower nominal Zener voltage (6.2 V), tighter VZ tolerance (±5%), slightly higher leakage (700 nA), same package and pinout | Better suited for 5 V logic rails with tighter margin between operating voltage and clamping threshold | Choose MMQA6V2T1G for 5 V systems needing lower clamping onset; MMQA6V8T1G is optimal for 6.8 V or higher bias rails with greater noise margin |
Compared with SZMMQA6V8T1G, the MMQA6V8T1G lacks automotive qualification but offers identical protection performance and footprint for cost-sensitive commercial designs; versus MMQA6V2T1G, it provides higher VZ headroom for 6–7 V interfaces, reducing false triggering risk in noisy environments.
Availability
MMQA6V8T1G is available at Aetrix Electronics and suitable for USB interface protection, keyboard/mouse ESD hardening, and microprocessor I/O bus safeguarding requiring stable component supply and long-term production continuity.
Supply support for MMQA6V8T1G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMQA6V8T1G belongs to onsemi's Quad Common Anode ESD Protection Diode family, engineered specifically to consolidate multi-line transient suppression into ultra-compact surface-mount packages for space-constrained digital interfaces.
FAQ
What is the exact Zener voltage range for MMQA6V8T1G?
The MMQA6V8T1G has a guaranteed breakdown voltage range of 6.46 V to 7.14 V at test current IZT = 1.0 mA, with nominal value 6.8 V. This range ensures consistent clamping behavior across manufacturing lots and temperature extremes, making MMQA6V8T1G suitable for precision 6.8 V rail protection where overvoltage margin must be tightly controlled.
Does MMQA6V8T1G support bidirectional ESD protection?
No, MMQA6V8T1G is strictly unidirectional - it conducts only when cathode voltage exceeds anode voltage. Its internal structure consists of four anode-cathode junctions configured for forward-biased clamping to ground. For bidirectional protection, separate back-to-back diode arrays or dedicated bidirectional TVS devices must be used; MMQA6V8T1G is not rated for reverse conduction.
How many independent protection channels does MMQA6V8T1G provide?
MMQA6V8T1G provides four independent unidirectional ESD protection channels in a single SC-74 package. Pins 1–2, 3–2, 4–2, and 6–5 form four distinct cathode-to-anode paths, with two shared anode nodes (Pins 2 and 5) enabling flexible PCB routing. This architecture allows simultaneous protection of four signal lines without cross-talk or shared impedance issues.
What is the maximum clamping voltage of MMQA6V8T1G under surge conditions?
The maximum clamping voltage (VRSM) of MMQA6V8T1G is 9.8 V at peak surge current IRSM = 2.45 A, measured using the 8/20 µs waveform per Figure 6. This value represents the upper limit of voltage seen by protected circuitry during worst-case ESD events, ensuring downstream components like USB PHYs or microcontroller GPIOs remain within safe absolute maximum ratings.
Is MMQA6V8T1G compatible with lead-free reflow soldering processes?
Yes, MMQA6V8T1G is Pb-free and RoHS compliant, qualified for standard lead-free reflow profiles with peak temperature up to 260 °C (10-second duration). Its thermosetting plastic case and corrosion-resistant finish ensure reliability during JEDEC J-STD-020-compliant thermal cycling, making MMQA6V8T1G suitable for modern high-volume SMT assembly lines without solderability concerns.
MMQA6V8T1G 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:
- General Purpose
- Capacitance @ Frequency:
- 250pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
MMQA6V8T1G FAQ
1.How can I place an order for MMQA6V8T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMQA6V8T1G 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 MMQA6V8T1G reliable?
The price and inventory of MMQA6V8T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMQA6V8T1G is usually 5 days.
3.What payment methods are accepted for MMQA6V8T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMQA6V8T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMQA6V8T1G?
MMQA6V8T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMQA6V8T1G 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 MMQA6V8T1G?
For technical support, including MMQA6V8T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMQA6V8T1G requirements.
6.How does Aetrix verify that MMQA6V8T1G is sourced from the original manufacturer or authorized distributors?
All MMQA6V8T1G 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 MMQA6V8T1G meets industry standards.
7.What is the process for return or replacement of MMQA6V8T1G?
All MMQA6V8T1G units undergo pre-shipment inspection (PSI). If there is an issue with MMQA6V8T1G, 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 MMQA6V8T1G part is unused and in its original packaging.
Return procedure for MMQA6V8T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMQA6V8T1G Tags
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