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onsemi MMQA27VT1
- Part No.:
- MMQA27VT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
MMQA27VT1.pdf
- Description:
- TVS QUAD MI CA 24W 27V SC74-6
- Quantity:
- Payment:
- Shipping:
Inventory:6,820
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Product details
Overview
MMQA27VT1 from onsemi is a quad monolithic common-anode ESD protection diode designed for transient overvoltage suppression on four independent signal lines in space-constrained PCBs. It features a nominal Zener voltage of 27 V, maximum clamping voltage of 39 V at 125 A surge current, and ESD rating >16 kV per Human Body Model (HBM Class 3B). It is used in microprocessor I/O bus protection, keyboard/terminal interfaces, and communication port surge hardening.
For engineers reviewing the MMQA27VT1 datasheet, pinout, applications, or equivalent options, this device serves as a compact, unidirectional, SC-74 packaged TVS array optimized for board-level ESD immunity, low leakage (<75 nA), and fast response to 8/20 µs and 10/1000 µs transients in industrial and computing systems.
Technical Context
This device implements four independent unidirectional Zener junctions sharing a common anode connection (pins 2 and 5), enabling simultaneous protection of four signal lines referenced to a shared ground or supply rail. Its architecture avoids internal series resistance or integrated capacitance tuning - clamping behavior is defined solely by the silicon junction characteristics and package parasitics.
It operates strictly in unidirectional mode with forward conduction only when cathode-to-anode voltage exceeds ~0.9 V; reverse breakdown initiates at 25.7 V (min) and clamps up to 39 V under 125 A 8/20 µs surge. Thermal performance is specified for FR-5 and alumina substrates, with RJA = 556 °C/W and 417 °C/W respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZT) | 25.7–28.4 V @ 1 mA test current - defines precise reverse conduction onset for 27 V nominal rail protection |
| Clamping Voltage (VRSM) | 39 V @ 125 A, 8/20 µs waveform - limits peak line voltage during surge events to safe levels for downstream ICs |
| Peak Pulse Power | 150 W @ 20 µs pulse - supports high-energy transient suppression without thermal runaway |
| Reverse Leakage (IR) | <75 nA @ 21 V - ensures negligible standby current draw on protected signal lines |
| ESD Rating (HBM) | >16 kV - meets IEC 61000-4-2 Level 4 immunity requirements for user-accessible ports |
| Junction Temp Range | −55 °C to +150 °C - enables operation in extended industrial and automotive under-hood environments |
| Capacitance @ 0 V | 28 pF - low enough to avoid signal integrity degradation on USB 2.0 or UART lines up to ~48 MHz |
Pinout & Package
MMQA27VT1 is housed in an SC-74 (Case 318F) surface-mount package - a 6-pin, 2.2 mm × 2.2 mm × 1.0 mm thermoset plastic body optimized for automated placement and reflow soldering. The package supports high-density routing with 0.95 mm pin pitch and Pb-free (RoHS-compliant) terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | Protected signal line input for first unidirectional path; connects to I/O trace requiring clamping to common anode |
| 2 | Anode (Common) | Shared reference node - must be tied to system ground or stable supply rail for all four channels |
| 3 | Cathode (Channel B) | Second protected line; electrically isolated from Pin 1 but shares same anode reference (Pin 2) |
| 4 | Cathode (Channel C) | Third protected line; enables three-line protection without additional package footprint |
| 5 | Anode (Common) | Redundant anode connection - improves current sharing and reduces bond wire inductance during surge |
| 6 | Cathode (Channel D) | Fourth protected line; completes quad-channel configuration in single SC-74 outline |
Key Features
| Feature | Design Value |
|---|---|
| Quad Common-Anode Architecture | Four independent unidirectional TVS paths share two anode pins (2 & 5), reducing PCB real estate by ~75% vs discrete diodes |
| Low Clamping Ratio (VRSM/VZT) | 1.44 (39 V / 27 V) - minimizes voltage overshoot during surge, preserving margin for 3.3 V or 5 V logic interfaces |
| HBM ESD Robustness | Class 3B (>16 kV) - exceeds IEC 61000-4-2 requirement for consumer and industrial equipment ports |
| Thermal Derating Support | FR-5 board power derating curve provided - enables accurate lifetime estimation under repeated surge stress |
| Pb-Free & RoHS Compliance | Meets EU Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 - suitable for lead-free reflow |
Applications
| Microprocessor I/O Bus Protection | Keyboard/Peripheral Interface |
|---|---|
Use Scenario: Protecting address/data/control buses between CPU and peripheral ICs against ESD events during hot-plug or handling. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed directly at connector or IC pad to clamp surges before reaching sensitive CMOS inputs. Use Value: Prevents latch-up or gate oxide damage in microcontrollers operating at 3.3 V or 5 V, leveraging 39 V clamping headroom and 28 pF capacitance compatible with ≤48 MHz bus speeds. |
Use Scenario: Shielding PS/2, USB, or serial interface lines on keyboards, terminals, or point-of-sale devices from user-induced ESD. IC Role / Device Role / Timing Role: Quad-channel common-anode TVS array connected between each signal line and chassis ground to shunt HBM discharges. Use Value: Eliminates need for four separate SOD-323 diodes - saves 3.5 mm² PCB area while maintaining <75 nA leakage to avoid pull-up resistor loading. |
| Industrial Communication Port | Medical Equipment Signal Line |
Use Scenario: Hardening RS-232, RS-485, or CAN physical layer transceivers against lightning-induced surges and cable discharge events. IC Role / Device Role / Timing Role: Front-end protection element placed before transceiver ICs to limit transient energy entering the IC's ESD structures. Use Value: Withstands 150 W (20 µs) pulses and clamps to 39 V, ensuring transceiver survival during 4 kV contact discharge per IEC 61000-4-5 Level 3. |
Use Scenario: Safeguarding analog sensor inputs (e.g., ECG leads, temperature probes) and digital control lines in FDA-regulated medical devices. IC Role / Device Role / Timing Role: Low-leakage (75 nA), low-capacitance (28 pF) ESD clamp on patient-connected or diagnostic signal paths. Use Value: Maintains signal fidelity and meets IEC 60601-1-2 ESD immunity requirements without introducing offset error or bandwidth loss in sub-10 kHz biosignal paths. |
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, PPAP-capable, identical electrical specs and pinout - differs only in automotive-grade traceability and control flow | Required for automotive infotainment or ADAS module designs needing certified component sourcing | Select SZMMQA27VT1G when automotive qualification (AEC-Q101) and PPAP documentation are mandatory |
| MMQA27VT1G | Same die, identical SC-74 package, Pb-free marking "G" suffix - functionally identical to MMQA27VT1 with updated RoHS compliance labeling | No functional difference; "G" suffix indicates full RoHS compliance per latest onsemi manufacturing standards | Prefer MMQA27VT1G for new designs requiring documented Pb-free status and compatibility with modern reflow profiles |
Compared with MMQA27VT1, SZMMQA27VT1G adds automotive qualification and process controls without altering electrical behavior, while MMQA27VT1G provides identical performance with formal RoHS labeling - both retain the same 27 V Zener, 39 V clamping, and quad common-anode SC-74 layout.
Availability
MMQA27VT1 is available at Aetrix Electronics and suitable for microprocessor I/O protection, industrial communication port hardening, and medical signal line safeguarding requiring stable component supply across long-lifecycle embedded programs.
Supply support for MMQA27VT1 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 management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
MMQA27VT1 belongs to the MMQA Quad Common Anode Series - engineered specifically for high-density, multi-line ESD protection in space-constrained computing and industrial control systems where minimizing footprint and simplifying layout are critical.
FAQ
What is the exact Zener voltage tolerance for MMQA27VT1?
The MMQA27VT1 has a guaranteed Zener voltage range of 25.7 V (minimum) to 28.4 V (maximum) at 1.0 mA test current, with a nominal value of 27 V. This ±5% tolerance ensures reliable triggering across temperature and production lots while maintaining compatibility with 24–30 V system rails. All MMQA27VT1 units meet this specification per onsemi datasheet Rev. 13.
Does MMQA27VT1 support bidirectional transient suppression?
No, MMQA27VT1 is strictly unidirectional - it conducts only when cathode voltage exceeds anode voltage by ≥0.9 V (forward bias) or when reverse voltage exceeds the Zener breakdown threshold (25.7–28.4 V). It does not protect against negative-going transients on the anode side. For bidirectional protection, a separate device such as the NUP4105 or PUSB3FR must be used.
What is the maximum surge current rating for MMQA27VT1?
MMQA27VT1 is rated for a maximum non-repetitive peak reverse surge current (IRSM) of 125 A under the 8/20 µs waveform (per Figure 6), with corresponding clamping voltage of 39 V. This rating is validated at TA = 25 °C and assumes proper PCB thermal relief per FR-5 or alumina substrate guidelines in the datasheet.
Can MMQA27VT1 be used in automotive applications?
MMQA27VT1 itself is not AEC-Q101 qualified; however, its automotive-grade variant SZMMQA27VT1G is fully qualified and PPAP-capable. While MMQA27VT1 shares identical electrical and mechanical specifications, only SZMMQA27VT1G meets the stress testing, traceability, and process control requirements for automotive use. Use SZMMQA27VT1G for infotainment, body control, or ADAS modules.
How does the dual-anode pin configuration (Pins 2 and 5) affect layout?
The dual-anode design (Pins 2 and 5) in MMQA27VT1 reduces inductive impedance during surge events by providing parallel bond wire paths to the common anode node. Layout best practice requires short, low-inductance traces connecting both pins to the same ground or supply plane - splitting them degrades clamping performance. This configuration is electrically equivalent to a single anode but improves current sharing and thermal distribution.
MMQA27VT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- MMQA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMQA27VT1 FAQ
1.How can I place an order for MMQA27VT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMQA27VT1 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 MMQA27VT1 reliable?
The price and inventory of MMQA27VT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMQA27VT1 is usually 5 days.
3.What payment methods are accepted for MMQA27VT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMQA27VT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMQA27VT1?
MMQA27VT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMQA27VT1 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 MMQA27VT1?
For technical support, including MMQA27VT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMQA27VT1 requirements.
6.How does Aetrix verify that MMQA27VT1 is sourced from the original manufacturer or authorized distributors?
All MMQA27VT1 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 MMQA27VT1 meets industry standards.
7.What is the process for return or replacement of MMQA27VT1?
All MMQA27VT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMQA27VT1, 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 MMQA27VT1 part is unused and in its original packaging.
Return procedure for MMQA27VT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMQA27VT1 Tags
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D12V0L1B2LP-7B
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