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onsemi SZMMQA5V6T3G
- Part No.:
- SZMMQA5V6T3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-74, SOT-457
- Datasheet:
-
SZMMQA5V6T3G.pdf
- Description:
- ESD / SURGE PROTECTOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,255
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Product details
Overview
SZMMQA5V6T3G 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 5.6 V nominal Zener voltage (min 5.32 V, max 5.88 V), ≤2.0 µA reverse leakage at 25 °C, and clamping voltage of 8.0 V at 3.0 A peak pulse current. Ideal for space-constrained I/O protection in computer interfaces and microprocessor buses.
For engineers reviewing the SZMMQA5V6T3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, validated SC-74 terminal mapping, real-world use cases in keyboard/printer interfaces and CPU bus protection, and two confirmed alternative parts with documented parameter differences.
Technical Context
This device implements a quad unidirectional common-anode configuration: pins 2 and 5 serve as shared anodes, while pins 1, 3, 4, and 6 are individual cathodes-enabling four independent clamping paths from protected lines to ground. Each junction meets AEC-Q101 qualification and supports Class 3B ESD immunity (>16 kV HBM).
It delivers 24 W peak power dissipation at 1.0 ms pulse (Figure 5 waveform) and 150 W at 20 µs pulse (Figure 6 waveform), with thermal resistance of 556 °C/W on FR-5 board. Clamping performance is specified at 8.0 V @ 3.0 A, ensuring reliable protection for 3.3 V and 5 V logic interfaces without overstressing downstream ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZT) | 5.32–5.88 V @ 1.0 mA test current - defines precise clamping threshold for 5 V systems |
| Clamping Voltage (VRSM) | 8.0 V @ 3.0 A peak pulse - limits transient stress on connected logic inputs |
| Reverse Leakage (IR) | <2.0 µA @ 25 °C - ensures minimal DC loading on high-impedance signal lines |
| ESD Rating | Class 3B per HBM (>16 kV) - exceeds IEC 61000-4-2 Level 4 requirements |
| Peak Pulse Power | 150 W @ 20 µs - handles fast, high-energy ESD events without failure |
| Junction Temp Range | −55 to +150 °C - supports automotive under-hood and industrial ambient conditions |
| Capacitance @ 0 V | 100–250 pF - low enough for USB 2.0 and parallel bus signal integrity |
Pinout & Package
SC-74 (Case 318F) surface-mount package with 6-pin leadframe, Pb-free finish, and optimized thermal path for FR-5 PCB mounting. Dimensions conform to onsemi mechanical drawing 98ASB42973B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Channel A) | Protected line input for first unidirectional clamp path to shared anode |
| 2 | Anode (Common) | Shared anode connection for Channels A, B, C, D - ties to system ground |
| 3 | Cathode (Channel B) | Protected line input for second clamp path - electrically isolated from Pin 1 |
| 4 | Cathode (Channel C) | Protected line input for third clamp path - enables compact multi-line routing |
| 5 | Anode (Common) | Second shared anode node - redundant grounding path improves surge current sharing |
| 6 | Cathode (Channel D) | Protected line input for fourth clamp path - completes quad-line protection in one footprint |
Key Features
| Feature | Design Value |
|---|---|
| Quad Common-Anode Architecture | Four independent unidirectional clamps share two anode terminals - reduces PCB area by ~75% vs discrete diodes |
| 150 W Peak Pulse Power (20 µs) | Withstands high-energy ESD transients without degradation - validated per Figure 6 waveform |
| AEC-Q101 Qualified | Qualified for automotive applications including infotainment I/O and body control modules |
| Pb-Free & RoHS Compliant | Meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
| Low Capacitance (100–250 pF) | Preserves signal edge rate on 10–50 MHz parallel buses and UART/USB 2.0 lines |
Applications
| Keyboard/Printer Interface Protection | Microprocessor Bus Protection |
|---|---|
Use Scenario: Protecting PS/2, parallel printer, or serial port lines against ESD during hot-plug insertion. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between connector and controller IC. Use Value: Prevents latch-up or gate oxide damage in host controller by clamping transients to 8.0 V before they exceed logic VCC + 0.5 V. |
Use Scenario: Safeguarding address/data/control lines between CPU, RAM, and peripheral ICs in embedded controllers. IC Role / Device Role / Timing Role: Line-level ESD clamp on bidirectional bus segments with common-ground reference. Use Value: Maintains signal integrity with ≤250 pF capacitance while limiting overshoot to safe levels during handling or cable discharge. |
| Industrial HMI Panel I/O | Automotive Infotainment Display Link |
Use Scenario: Shielding touchscreen controller, encoder, or button matrix inputs in factory HMIs exposed to operator ESD. IC Role / Device Role / Timing Role: Ground-referenced transient suppressor on low-voltage analog/digital sensor inputs. Use Value: Enables robust operation at −40 to +85 °C ambient with <2 µA leakage preserving battery life in always-on panels. |
Use Scenario: Protecting LVDS or FPD-Link II display interface lines in automotive head units subject to ISO 10605 testing. IC Role / Device Role / Timing Role: High-speed ESD clamp on differential pairs with matched channel capacitance. Use Value: AEC-Q101 qualification and 150 W pulse rating ensure compliance with automotive ESD immunity requirements up to 30 kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMQA5V6T1G | Same Zener voltage range (5.32–5.88 V), identical SC-74 package, but rated for 3,000-unit tape-and-reel vs 10,000-unit for SZMMQA5V6T3G | Not AEC-Q101 qualified; intended for commercial-grade computing and office equipment only | Select MMQA5V6T1G for cost-sensitive non-automotive designs where volume packaging is not required |
| SZMMQA6V2T3G | Higher nominal Zener voltage (6.2 V), clamping voltage 9.0 V @ 2.66 A, same SC-74 footprint and AEC-Q101 qualification | Better suited for 5 V systems with higher noise margins or legacy 6 V logic rails | Choose SZMMQA6V2T3G when protecting circuits requiring tighter clamping above 5.5 V or compatibility with older 6 V interface standards |
Compared with MMQA5V6T1G and SZMMQA6V2T3G, the SZMMQA5V6T3G offers optimal balance of low clamping voltage (8.0 V), automotive qualification, and high-volume packaging - making it preferred for new automotive and industrial designs needing robust 5 V line protection.
Availability
SZMMQA5V6T3G is available at Aetrix Electronics and suitable for industrial HMI panels, automotive infotainment displays, and microprocessor-based embedded systems requiring stable component supply across long production lifecycles.
Supply support for SZMMQA5V6T3G 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.
SZMMQA5V6T3G belongs to the SZMMQA Quad Common Anode Series - engineered specifically for high-density, multi-line ESD protection in space-constrained automotive and industrial electronics.
FAQ
What is the Zener voltage tolerance of SZMMQA5V6T3G?
The SZMMQA5V6T3G has a nominal Zener voltage of 5.6 V with a guaranteed tolerance of ±5% - meaning the actual breakdown voltage falls between 5.32 V and 5.88 V at 1.0 mA test current. This tight tolerance ensures consistent clamping behavior across production lots and temperature ranges, critical for reliable protection in 5 V logic systems where overvoltage margin is narrow.
Does SZMMQA5V6T3G support bidirectional ESD protection?
No, SZMMQA5V6T3G is a unidirectional ESD protection diode configured as a quad common-anode device. It protects signals referenced to ground only - each cathode pin clamps positive transients to the shared anode (ground). For bidirectional protection, separate devices like the NUP4105 or dual-rail configurations would be required.
What is the maximum operating temperature for SZMMQA5V6T3G?
The SZMMQA5V6T3G is rated for junction and storage temperatures from −55 °C to +150 °C. Its thermal resistance of 556 °C/W on FR-5 board allows sustained operation at +85 °C ambient when derated per Figure 4, making it suitable for under-hood automotive modules and industrial enclosures without active cooling.
How does the SC-74 package of SZMMQA5V6T3G compare to SOT-23-6?
The SC-74 (Case 318F) used by SZMMQA5V6T3G is dimensionally identical to SOT-23-6 and shares the same pin pitch and footprint. However, SC-74 specifies tighter thermal and mechanical parameters per onsemi's 98ASB42973B drawing - including optimized leadframe thickness and mold compound for enhanced surge current handling and solder joint reliability in automated assembly.
Is SZMMQA5V6T3G compatible with lead-free reflow processes?
Yes, SZMMQA5V6T3G is Pb-free and RoHS compliant, qualified for standard lead-free reflow profiles per JEDEC J-STD-020. Its maximum lead solder temperature is rated at 260 °C for 10 seconds, supporting industry-standard peak reflow temperatures of 245–260 °C without delamination or parametric shift.
SZMMQA5V6T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-74, SOT-457
- Series:
- SZMMQA
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 3V (Max)
- Voltage - Breakdown (Min):
- 5.32V
- Voltage - Clamping (Max) @ Ipp:
- 8V
- Current - Peak Pulse (10/1000µs):
- 3A
- Power - Peak Pulse:
- 24W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SZMMQA5V6T3G FAQ
1.How can I place an order for SZMMQA5V6T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMQA5V6T3G 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 SZMMQA5V6T3G reliable?
The price and inventory of SZMMQA5V6T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMQA5V6T3G is usually 5 days.
3.What payment methods are accepted for SZMMQA5V6T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMQA5V6T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMQA5V6T3G?
SZMMQA5V6T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMQA5V6T3G 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 SZMMQA5V6T3G?
For technical support, including SZMMQA5V6T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMQA5V6T3G requirements.
6.How does Aetrix verify that SZMMQA5V6T3G is sourced from the original manufacturer or authorized distributors?
All SZMMQA5V6T3G 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 SZMMQA5V6T3G meets industry standards.
7.What is the process for return or replacement of SZMMQA5V6T3G?
All SZMMQA5V6T3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMQA5V6T3G, 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 SZMMQA5V6T3G part is unused and in its original packaging.
Return procedure for SZMMQA5V6T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMQA5V6T3G Tags
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