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onsemi MMQA30VT1
- Part No.:
- MMQA30VT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
MMQA30VT1.pdf
- Description:
- TVS DIODE 30VWM 43.3VC SC74
- Quantity:
- Payment:
- Shipping:
Inventory:3,894
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Product details
Overview
MMQA30VT1 from onsemi is a quad common-anode unidirectional transient voltage suppressor (TVS) diode array in SC−74 package, designed for ESD and surge protection of four independent signal lines. It features 30 V nominal breakdown voltage (28.5–31.5 V), 43.3 V maximum clamping voltage at 1.0 A peak pulse current, 150 W peak power dissipation at 20 µs, and <75 nA reverse leakage at rated voltage. It is used in compact I/O interfaces of computers, printers, and communication systems where board space is constrained.
For engineers reviewing the MMQA30VT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, validated SC−74 terminal mapping, real-world ESD protection use cases, and two confirmed alternative TVS arrays with documented parameter differences for signal-line overvoltage design.
Technical Context
The MMQA30VT1 implements a monolithic quad-junction structure with shared anode terminals (pins 2 and 5), enabling four independent cathode-anode paths (pins 1–2, 3–2, 4–2, 6–2). Each channel operates as a unidirectional Zener clamp with 30 V nominal breakdown and 43.3 V clamping at 1.0 A.
It supports Human Body Model (HBM) ESD rating >16 kV, exhibits low 0.554 Ω dynamic impedance at test current, and maintains stable performance across −55°C to +150°C junction temperature range. Thermal resistance is 556°C/W on FR-5 board and 417°C/W on alumina substrate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZT) | 28.5–31.5 V at 1.0 mA - defines minimum trigger threshold for transient clamping |
| Clamping Voltage (VRSM) | 43.3 V at 1.0 A peak pulse - limits maximum voltage seen by protected IC during 20 µs surge |
| Peak Pulse Power (PPK) | 150 W @ 20 µs - sustains high-energy transients without failure per Figure 6 waveform |
| Reverse Leakage (IR) | <75 nA @ 23 V - ensures negligible standby current draw in signal path |
| ESD Rating (HBM) | >16 kV - exceeds Class N requirement for robust electrostatic discharge immunity |
| Capacitance (CJ) | 32 pF @ 0 V - minimizes signal distortion on high-speed data lines up to ~100 MHz |
| Thermal Resistance (RJA) | 556°C/W on FR-5 board - determines safe operating ambient temperature under continuous power |
Pinout & Package
MMQA30VT1 uses the SC−74 (Case 318F−05) surface-mount plastic package, measuring 2.90 × 1.30 × 0.95 mm, optimized for automated placement and reflow soldering. Its six-pin configuration supports quad unidirectional protection with shared anodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Channel A) | Protected line input for first signal path; connects to external trace requiring ESD clamp |
| Pin 2 | Common Anode | Shared anode node for Channels A, B, C, D; must be tied to system ground or reference rail |
| Pin 3 | Cathode (Channel B) | Protected line input for second signal path; electrically isolated from Pin 1 except via common anode |
| Pin 4 | Cathode (Channel C) | Protected line input for third signal path; enables compact routing of three independent lines |
| Pin 5 | Common Anode | Redundant anode connection for improved current sharing and thermal distribution |
| Pin 6 | Cathode (Channel D) | Protected line input for fourth signal path; completes quad-channel layout in single footprint |
Key Features
| Feature | Design Value |
|---|---|
| Quad Common-Anode Architecture | Four independent unidirectional clamps share only two anode pins (2 and 5), reducing PCB routing complexity and component count |
| Low Clamping Voltage | 43.3 V at 1.0 A ensures downstream logic ICs (e.g., 3.3 V or 5 V microcontrollers) remain within absolute maximum ratings during surge events |
| High ESD Withstand | HBM rating exceeding 16 kV protects sensitive USB, UART, or GPIO interfaces from human-hand electrostatic discharge |
| SC−74 Footprint Efficiency | Single 2.9 × 1.3 mm package replaces four discrete SOD-323 TVS diodes, saving >60% board area |
| Pb-Free Compliant Construction | Meets RoHS Directive 2011/65/EU; compatible with lead-free reflow profiles up to 260°C peak solder temperature |
Applications
| USB 2.0 Interface Protection | Industrial Serial Port (RS-232/485) |
|---|---|
Use Scenario: Protecting D+ and D− data lines, VBUS, and ID pins of embedded USB host/device ports against ESD and cable-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS array clamping each line to ground before transient energy reaches USB transceiver or controller. Use Value: Prevents latch-up or permanent damage to USB PHY while maintaining signal integrity due to 32 pF capacitance and fast response time. | Use Scenario: Safeguarding RS-232 TX/RX and RS-485 A/B differential pairs in factory automation controllers exposed to long cable runs and noisy environments. IC Role / Device Role / Timing Role: Quad-channel transient suppressor providing line-to-ground clamping for four critical signal paths simultaneously. Use Value: Enables reliable operation in industrial settings by limiting surge voltages to ≤43.3 V, well below RS-232 ±15 V and RS-485 ±12 V absolute max ratings. |
| Keyboard/Mouse PS/2 Interface | Medical Equipment Front-Panel Controls |
Use Scenario: Shielding CLK and DATA lines of legacy PS/2 keyboard/mouse connectors from user-hand ESD during plug/unplug cycles. IC Role / Device Role / Timing Role: Dual-channel unidirectional clamp (using two of four channels) referenced to system ground, with fast sub-nanosecond response. Use Value: Eliminates false keypresses or interface resets caused by ESD-induced noise, verified to withstand >16 kV HBM pulses. | Use Scenario: Protecting tactile buttons, LED indicators, and touch-sensitive overlays on medical device front panels subject to repeated operator contact. IC Role / Device Role / Timing Role: Four-channel ESD suppressor deployed across multiple control inputs and status outputs to meet IEC 60601-1-2 immunity requirements. Use Value: Ensures uninterrupted operation during clinical use by clamping transients to 43.3 V before they disrupt microcontroller GPIO states or analog sensing circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A | Single-channel SMA package; 43.3 V clamping at 10.3 A (vs. MMQA30VT1's 1.0 A); higher 400 W peak power | Requires four separate devices and 4× PCB area; better suited for high-current power-line protection than signal-line ESD | Select when protecting individual high-energy lines (e.g., DC input) rather than space-constrained multi-signal I/O |
| TPD4E05U06DQAR | Quad-channel, 5.5 V working voltage; 12 V clamping at 1 A; 0.5 pF/channel capacitance; designed for USB 3.0/Type-C | Optimized for high-speed digital interfaces (<1 GHz); incompatible with 30 V rail protection due to lower breakdown | Select for ultra-low-capacitance, high-speed data lines (e.g., HDMI, USB 3.x); not a voltage-range substitute for MMQA30VT1 |
Compared with SMAJ30A and TPD4E05U06DQAR, MMQA30VT1 uniquely balances 30 V breakdown, quad integration in SC−74, and 43.3 V clamping for mid-voltage signal-line protection-making it optimal for compact 24–33 V interface designs where discrete count and board area are critical constraints.
Availability
MMQA30VT1 is available at Aetrix Electronics and suitable for USB interface protection, industrial serial port hardening, medical front-panel ESD shielding, and compact computing peripheral designs requiring stable component supply and consistent parametric performance across production lots.
Supply support for MMQA30VT1 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMQA series belongs to onsemi's transient voltage suppressor product line, engineered specifically for space-constrained, multi-line ESD protection in consumer and industrial electronics using monolithic quad-junction architecture.
FAQ
What is the exact breakdown voltage range specified for MMQA30VT1?
The MMQA30VT1 has a guaranteed breakdown voltage (VZT) range of 28.5 V to 31.5 V at 1.0 mA test current, measured per the datasheet's Electrical Characteristics table. This tolerance band ensures predictable clamping onset across manufacturing lots and temperature extremes, and is distinct from its 43.3 V maximum clamping voltage at 1.0 A surge current. The MMQA30VT1's specification aligns with IEC 61000-4-2 Level 4 ESD immunity testing requirements.
Can MMQA30VT1 be used for bidirectional transient suppression?
No, MMQA30VT1 is strictly a unidirectional TVS device, configured as four independent cathode-to-common-anode clamps. Its pinout (cathodes on pins 1, 3, 4, 6; anodes on pins 2 and 5) does not support reverse-bias conduction. For bidirectional protection, a dedicated symmetric device such as the PUSB3FR4 or SMAJ30CA would be required. The MMQA30VT1 datasheet explicitly specifies "Unidirectional" operation and provides clamping curves only for forward surge conditions.
What is the maximum allowable junction temperature for MMQA30VT1 during operation?
The MMQA30VT1 has a specified junction and storage temperature range of −55°C to +150°C. Its maximum steady-state junction temperature is therefore +150°C, limited by thermal resistance (556°C/W on FR-5 board) and ambient conditions. Derating begins above 25°C ambient per Figure 4 in the datasheet, and sustained operation near 150°C requires careful thermal design-including copper pour, airflow, or alumina substrate mounting-to avoid exceeding this limit. The MMQA30VT1's reliability is validated across this full range.
How does the SC−74 package of MMQA30VT1 compare to SOT-23 in size and thermal performance?
The SC−74 package measures 2.90 × 1.30 × 0.95 mm, identical in outline to standard SOT-23 but with six leads instead of three-enabling quad integration without increasing footprint. Thermally, MMQA30VT1's RJA is 556°C/W on FR-5 board, slightly higher than typical SOT-23 diodes (~400–500°C/W), due to internal monolithic junction layout and shared anode thermal path. However, its dual anode pins (2 and 5) improve current spreading, and the MMQA30VT1's 150 W 20 µs pulse rating confirms robust short-duration thermal handling despite the compact size.
Is MMQA30VT1 compliant with RoHS and REACH regulations?
Yes, MMQA30VT1 is Pb-free and RoHS-compliant per the datasheet's "Pb−Free Packages are Available" statement and marking code "30A" on the device body. It meets EU Directive 2011/65/EU (RoHS 2) and Regulation (EC) No. 1907/2006 (REACH), with no SVHC substances above threshold. The MMQA30VT1's lead finish and mold compound are qualified for lead-free reflow up to 260°C, and full compliance documentation is available through onsemi's material declarations portal.
MMQA30VT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- MMQA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 43.3V
- Current - Peak Pulse (10/1000µs):
- 554mA (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
MMQA30VT1 FAQ
1.How can I place an order for MMQA30VT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMQA30VT1 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 MMQA30VT1 reliable?
The price and inventory of MMQA30VT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMQA30VT1 is usually 5 days.
3.What payment methods are accepted for MMQA30VT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMQA30VT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMQA30VT1?
MMQA30VT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMQA30VT1 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 MMQA30VT1?
For technical support, including MMQA30VT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMQA30VT1 requirements.
6.How does Aetrix verify that MMQA30VT1 is sourced from the original manufacturer or authorized distributors?
All MMQA30VT1 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 MMQA30VT1 meets industry standards.
7.What is the process for return or replacement of MMQA30VT1?
All MMQA30VT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMQA30VT1, 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 MMQA30VT1 part is unused and in its original packaging.
Return procedure for MMQA30VT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMQA30VT1 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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