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onsemi MMQA27VT1G
- Part No.:
- MMQA27VT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
MMQA27VT1G.pdf
- Description:
- TVS DIODE 21VWM 39VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:4,390
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMQA27VT1G from onsemi is a quad monolithic common-anode ESD protection diode designed for transient overvoltage suppression on four independent signal lines. It features a 27 V nominal Zener voltage (25.7–28.4 V), 125 A maximum reverse surge current, 39 V clamping voltage at peak pulse current, and <75 nA reverse leakage at 21 V, suitable for I/O line protection in space-constrained computing and communication interfaces.
For engineers reviewing the MMQA27VT1G datasheet, pinout, applications, or equivalent options, this device is selected for compact quad-line ESD hardening where low clamping voltage, high surge robustness, and SC-74 footprint efficiency are critical in USB, keyboard, or microprocessor bus designs.
Technical Context
The MMQA27VT1G implements a monolithic silicon quad-junction structure with shared anode terminals (pins 2 and 5), enabling four unidirectional ESD protection paths in one SC-74 package. Its design targets fast transient response with 39 V clamping at 125 A and Class 3B HBM ESD rating (>16 kV).
Thermal performance is defined for FR-5 board (RJA = 556 °C/W) and alumina substrate (RJA = 417 °C/W), supporting operation from −55 °C to +150 °C. Peak power handling is rated at 24 W (1.0 ms waveform) and 150 W (8 × 20 µs waveform), per Figures 5 and 6 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZT) | 25.7–28.4 V at 1.0 mA - defines precise clamping threshold for 27 V rail protection |
| Clamping Voltage (VRSM) | 39 V at 125 A peak pulse - limits transient voltage seen by downstream ICs during ESD events |
| Reverse Leakage (IR) | <75 nA at 21 V - ensures minimal signal loading and power loss in standby |
| ESD Rating (HBM) | Class 3B (>16 kV) - meets stringent electrostatic discharge immunity for end-user interface ports |
| Peak Pulse Power | 150 W @ 8 × 20 µs - supports high-energy transients typical in industrial/commercial environments |
| Junction Temp Range | −55 to +150 °C - enables deployment in extended-temperature automotive and industrial control systems |
Pinout & Package
MMQA27VT1G is housed in an SC-74 (Case 318F) surface-mount package - a 6-pin, lead-free, void-free thermosetting plastic case optimized for automated assembly and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | Independent ESD path for Line A; connects to protected signal and common anode |
| 2 | Anode (Common) | Shared anode node for Channels A, B, C, D - ties to system ground or reference plane |
| 3 | Cathode (Channel B) | Independent ESD path for Line B; electrically isolated from other cathodes |
| 4 | Cathode (Channel C) | Independent ESD path for Line C; enables simultaneous protection of three I/Os |
| 5 | Anode (Common) | Second shared anode terminal - improves current sharing and thermal distribution |
| 6 | Cathode (Channel D) | Independent ESD path for Line D; completes quad-channel configuration |
Key Features
| Feature | Design Value |
|---|---|
| Quad common-anode architecture | Four discrete unidirectional ESD paths share two anode pins - reduces component count and PCB area vs. discrete diodes |
| Low clamping voltage (39 V) | Minimizes stress on 3.3 V/5 V logic interfaces during 125 A surges - preserves signal integrity and IC reliability |
| SC-74 footprint | Compact 2.2 × 2.2 × 1.0 mm outline - fits tight pitch layouts without sacrificing surge capability |
| HBM Class 3B ESD rating | Withstands >16 kV human-body discharges - satisfies IEC 61000-4-2 Level 4 requirements for external ports |
Applications
| USB 2.0 Data Lines | Keyboard/Mouse Interface |
|---|---|
Use Scenario: Protecting D+ and D− differential pair plus VBUS and ID lines in compact peripheral connectors. IC Role / Device Role / Timing Role: Unidirectional ESD clamp on each line - suppresses contact discharge transients before they reach USB transceiver. Use Value: Prevents latch-up or damage in USB PHY ICs while maintaining signal rise/fall times due to low capacitance (28 pF typical). | Use Scenario: Hardening PS/2 or USB HID scan matrix rows/columns against user-hand ESD in office equipment. IC Role / Device Role / Timing Role: Quad-channel line protector - grounds transient energy from four key matrix lines via shared anodes. Use Value: Eliminates need for four separate SOT-23 diodes, saving >60% board area in dense keyboard controller layouts. |
| Microprocessor Address Bus | Industrial Serial Communication |
Use Scenario: Shielding 16-bit address lines (A0–A15) of embedded CPUs from board-level ESD coupling. IC Role / Device Role / Timing Role: Parallel clamping device - four channels protect subsets of bus lines (e.g., A0–A3, A4–A7) with matched VZ. Use Value: Ensures deterministic clamping at 39 V across all protected lines - avoids timing skew from inconsistent diode VF in discrete solutions. | Use Scenario: Safeguarding RS-485 transceiver I/O pins (A, B, Y, Z) in factory automation nodes exposed to cable discharge events. IC Role / Device Role / Timing Role: Common-anode TVS array - routes surge current from four differential lines to chassis ground through dual anode terminals. Use Value: Delivers 150 W pulse robustness per channel - sustains repeated 8 × 20 µs transients without degradation in harsh EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMQA27VT1G | AEC-Q101 qualified; identical electrical specs but automotive-grade process control and PPAP documentation support | Required for automotive infotainment or body control modules needing qualification traceability | Select SZMMQA27VT1G when automotive compliance (not just ruggedness) is mandated |
| MMQA27VT3G | Same die and specs; supplied in 10,000-unit tape-and-reel vs. 3,000-unit reel for MMQA27VT1G | Optimized for high-volume production runs with reduced reel change frequency | Choose MMQA27VT3G for manufacturing scale-up where logistics efficiency outweighs small order flexibility |
Compared with SZMMQA27VT1G, the MMQA27VT1G lacks AEC-Q101 certification but offers identical protection performance for commercial/industrial use; versus MMQA27VT3G, it provides smaller reel quantities ideal for prototyping and low-MOQ procurement without functional trade-offs.
Availability
MMQA27VT1G is available at Aetrix Electronics and suitable for USB interface protection, keyboard/mouse ESD hardening, and microprocessor bus safeguarding requiring stable component supply and RoHS-compliant packaging.
Supply support for MMQA27VT1G 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.
The MMQA27VT1G belongs to onsemi's Quad Common Anode ESD Protection Diode product line - engineered specifically to consolidate multi-line transient suppression into minimal PCB real estate while maintaining high surge robustness and low clamping.
FAQ
What is the exact Zener voltage tolerance of MMQA27VT1G?
The MMQA27VT1G has a specified Zener voltage range of 25.7 V to 28.4 V at test current IZT = 1.0 mA, with a nominal value of 27 V. This ±5% tolerance ensures consistent clamping behavior across production lots and temperature extremes from −55 °C to +150 °C, as verified in the onsemi datasheet revision 13.
How does MMQA27VT1G achieve quad-channel protection with only two anode pins?
The MMQA27VT1G uses a monolithic quad-junction silicon die with two internal common-anode nodes (pins 2 and 5), each connecting to two cathodes (pins 1/3 and 4/6 respectively). This architecture allows four independent unidirectional ESD paths while minimizing package size and thermal resistance - confirmed in the pin assignment diagram and thermal characterization data.
Is MMQA27VT1G compatible with lead-free reflow soldering processes?
Yes, MMQA27VT1G is Pb-free and RoHS compliant, with a maximum lead solder temperature rating of 260 °C for 10 seconds. Its SC-74 package is qualified for standard lead-free reflow profiles, including JEDEC J-STD-020 moisture sensitivity level 1, as documented in the onsemi Soldering and Mounting Techniques Reference Manual.
What is the clamping voltage of MMQA27VT1G under a 125 A ESD pulse?
The MMQA27VT1G clamps to a maximum of 39 V at 125 A peak pulse current (8 × 20 µs waveform), as specified in the Electrical Characteristics table. This value is measured at TA = 25 °C and represents the upper limit of voltage imposed on protected lines during worst-case ESD events.
Does MMQA27VT1G support bidirectional transient suppression?
No, MMQA27VT1G is strictly unidirectional - its common-anode configuration only protects against positive transients on cathode lines relative to the anode reference. For bidirectional protection, designers must pair it with complementary devices or select dedicated bidirectional arrays like the NUP4105MR6T1G, as clarified in the datasheet's "UNIDIRECTIONAL" section header.
MMQA27VT1G 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):
- 21V (Max)
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 39V
- Current - Peak Pulse (10/1000µs):
- 615mA (8/20µs)
- Power - Peak Pulse:
- 150W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
MMQA27VT1G FAQ
1.How can I place an order for MMQA27VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMQA27VT1G 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 MMQA27VT1G reliable?
The price and inventory of MMQA27VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMQA27VT1G is usually 5 days.
3.What payment methods are accepted for MMQA27VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMQA27VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMQA27VT1G?
MMQA27VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMQA27VT1G 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 MMQA27VT1G?
For technical support, including MMQA27VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMQA27VT1G requirements.
6.How does Aetrix verify that MMQA27VT1G is sourced from the original manufacturer or authorized distributors?
All MMQA27VT1G 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 MMQA27VT1G meets industry standards.
7.What is the process for return or replacement of MMQA27VT1G?
All MMQA27VT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMQA27VT1G, 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 MMQA27VT1G part is unused and in its original packaging.
Return procedure for MMQA27VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMQA27VT1G Tags
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ESD5Z3.3T1G
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ESD5Z5.0T1G
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D12V0L1B2LP-7B
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PESD2V0Y1BSFYL
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