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Microchip Technology SMDA12-6E3/TR7
- Part No.:
- SMDA12-6E3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SMDA12-6E3/TR7.pdf
- Description:
- TVS DIODE 12VWM 24VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,485
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Product details
Overview
SMDA12-6E3/TR7 from Microsemi (now Microchip Technology) is a unidirectional transient voltage suppressor (TVS) array in SO-8 package, designed for board-level ESD and EFT protection of six I/O lines. It features 12 V standoff voltage (VWM), 13.3 V minimum breakdown voltage (VBR), 19.0 V clamping voltage at 1 A, 24 V at 5 A, and 185 pF capacitance at 1 MHz - ideal for safeguarding TTL/CMOS microprocessor I/O transceivers against IEC 61000-4-2 (±15 kV contact) and IEC 61000-4-4 (4 kV) transients.
For engineers reviewing the SMDA12-6E3/TR7 datasheet, SMDA12-6E3/TR7 pinout, SMDA12-6E3/TR7 application, or SMDA12-6E3/TR7 equivalent, key selection criteria include standoff voltage matching circuit operating voltage, clamping performance under 5 A surge, low leakage (<1 µA @ VWM), and SO-8 footprint compatibility with high-density I/O routing.
Technical Context
This TVS array implements six independent unidirectional avalanche diode junctions in a single SO-8 package, each configured as a cathode-to-rail clamp to ground. Its 8/20 µs pulse rating of 300 W per line enables robust suppression of fast-rising ESD and EFT events without latch-up or degradation.
The device operates across –55 °C to +150 °C and exhibits a positive temperature coefficient of VBR (+10 mV/°C), ensuring stable breakdown behavior over industrial temperature ranges. Pin 1 is marked by a dot on the package top, aligning with standard SO-8 orientation for automated placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 12.0 V - maximum continuous DC or RMS operating voltage the protected line may sustain without triggering conduction |
| Breakdown Voltage (VBR @ 1 mA) | 13.3 V min - guaranteed avalanche initiation threshold, ensuring reliable turn-on before downstream IC damage |
| Clamping Voltage (VC @ 1 A) | 19.0 V - peak voltage seen by protected circuit during 1 A 8/20 µs transient, limiting stress on I/O buffers |
| Clamping Voltage (VC @ 5 A) | 24.0 V - maximum clamped voltage under severe 5 A surge, critical for interface reliability in noisy environments |
| Leakage Current (ID @ VWM) | <1 µA - negligible standby power loss and signal integrity impact on high-impedance CMOS/TTL inputs |
| Capacitance (C @ 0 V, 1 MHz) | 185 pF - low enough to avoid signal distortion on moderate-speed digital lines (e.g., RS-232, SPI, parallel I/O) |
| Operating Temperature Range | –55 °C to +150 °C - supports deployment in automotive engine control units and industrial motor drives |
Pinout & Package
SO-8 surface-mount package (JEDEC MS-012AC), molded plastic body, 0.150 inch wide, 1.27 mm pitch, 0.050 inch lead thickness, weight ≈ 0.066 g. Pin 1 identified by dot marking on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | I/O Line 1 Cathode | Clamps transient energy from Line 1 to GND; connects to protected signal trace |
| 2 | GND | Common return path for all six TVS diodes; must be low-inductance connection to system ground plane |
| 3 | I/O Line 2 Cathode | Clamps transient energy from Line 2 to GND; electrically isolated from other lines |
| 4 | GND | Second ground terminal for thermal and current distribution; ties to same ground net as Pin 2 |
| 5 | I/O Line 3 Cathode | Clamps transient energy from Line 3 to GND; shares ground with Pins 2 and 4 |
| 6 | I/O Line 4 Cathode | Clamps transient energy from Line 4 to GND; maintains channel independence |
| 7 | I/O Line 5 Cathode | Clamps transient energy from Line 5 to GND; supports full 6-line protection in compact layout |
| 8 | I/O Line 6 Cathode | Clamps transient energy from Line 6 to GND; completes six-channel unidirectional array |
Key Features
| Feature | Design Value |
|---|---|
| 6-line unidirectional protection | Enables discrete, non-interfering clamping for multiple I/O signals sharing one SO-8 footprint |
| IEC 61000-4-2 & -4-4 compliance | Validated for ±15 kV contact / ±25 kV air discharge ESD and 4 kV electrical fast transients |
| 300 W peak pulse power (8/20 µs) | Withstands repeated high-energy surges without parametric shift or failure |
| Low 185 pF line-to-ground capacitance | Preserves signal edge rate on data lines up to ~10 Mbps without measurable jitter or attenuation |
| –55 °C to +150 °C operation | Supports under-hood automotive and high-temperature industrial PCB environments |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Protecting 24 V digital input channels in programmable logic controller backplanes exposed to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Unidirectional TVS array clamping each input to chassis ground, placed adjacent to connector entry points. Use Value: Prevents latch-up and gate oxide damage in 74HC-series input buffers while maintaining <1 µA leakage at 24 V nominal. | Use Scenario: Safeguarding LIN bus transceiver I/O pins and sensor analog inputs in door module ECUs subjected to ISO 10605 pulses. IC Role / Device Role / Timing Role: Board-level transient suppressor mounted directly at connector interface, with low-capacitance design preserving LIN signal integrity. Use Value: Clamps 24 V transients to ≤24 V at 5 A, enabling reliable communication during load dump and ESD events without signal distortion. |
| Medical Patient Monitor Interfaces | Point-of-Sale Terminal Keypads |
Use Scenario: Shielding RS-232 and USB D+/D− lines in portable diagnostic devices from hospital-grade ESD events per IEC 60601-1-2. IC Role / Device Role / Timing Role: Six-channel TVS array placed at board edge connectors, providing simultaneous protection for serial and peripheral interfaces. Use Value: 185 pF capacitance avoids timing skew on 115.2 kbps UART lines; 12 V VWM matches typical interface rail voltages. | Use Scenario: Securing membrane keypad scan lines and display data bus in retail terminals exposed to frequent human touch ESD. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) unidirectional clamp on each keypad row/column line, minimizing false key detection. Use Value: Ensures >100,000 actuation cycles without parameter drift; SO-8 footprint allows dense routing beneath keypad flex cable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Single-line DO-214AC package; 12 V VWM, 13.3 V VBR, 19.9 V VC@1 A, 27.7 V VC@10 A; 100 pF | Requires six discrete placements vs. single SO-8; lower capacitance but higher board area and assembly cost | Prefer when ultra-low capacitance (<100 pF) is mandatory and space allows discrete layout |
| SP1003-010 | Unidirectional 6-channel SO-8; 12 V VWM, 13.5 V VBR, 23 V VC@1 A, 33 V VC@5 A; 30 pF | Lower clamping voltage margin but significantly reduced capacitance - optimized for high-speed USB 2.0 | Choose for USB or HDMI interfaces where <50 pF is required; not suitable for 24 V industrial I/O |
Compared with SMAJ12A and SP1003-010, the SMDA12-6E3/TR7 delivers balanced clamping performance (24 V @ 5 A), proven industrial temperature range, and optimal 185 pF capacitance for general-purpose digital I/O - making it the preferred choice for cost-sensitive, space-constrained board-level protection where moderate speed and robust surge handling are both required.
Availability
SMDA12-6E3/TR7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical patient monitor interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMDA12-6E3/TR7 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
Microsemi Corporation (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The SMDAxx-6 series was developed specifically for board-level transient suppression in high-density digital systems, emphasizing low-profile SO-8 integration, multi-line coordination, and compliance with international EMC immunity standards.
FAQ
What is the standoff voltage rating of the SMDA12-6E3/TR7?
The SMDA12-6E3/TR7 has a standoff voltage (VWM) of 12.0 V, meaning it remains non-conductive up to this DC or RMS voltage level. This value is selected to match or exceed the normal operating voltage of protected circuits - such as 12 V I/O rails - ensuring no interference during steady-state operation while guaranteeing activation during overvoltage transients. The SMDA12-6E3/TR7's precise 12.0 V rating enables accurate alignment with common industrial and automotive interface voltage domains.
How does the SMDA12-6E3/TR7 meet IEC 61000-4-2 ESD requirements?
The SMDA12-6E3/TR7 is characterized and qualified to withstand ±15 kV contact discharge and ±25 kV air discharge per IEC 61000-4-2, verified through standardized testing of its clamping response and post-stress parametric stability. Its 300 W peak pulse power rating and sub-24 V clamping at 5 A ensure protected circuits remain below failure thresholds during ESD events. The SMDA12-6E3/TR7 achieves this without external components, delivering certified board-level immunity when placed within 2 cm of I/O connectors.
Can the SMDA12-6E3/TR7 protect bidirectional signal lines like USB D+ and D−?
No - the SMDA12-6E3/TR7 is a unidirectional TVS array, with each channel configured as a cathode-to-ground clamp. It is unsuitable for true bidirectional lines unless used in conjunction with additional components (e.g., series resistors or complementary diodes). For USB 2.0, HDMI, or other bidirectional interfaces, a dedicated bidirectional array such as the SP1003-010 or SMA6J12A would be required. The SMDA12-6E3/TR7 is intended for unidirectional I/O like GPIO, address/data buses, or LIN bus TX/RX lines referenced to ground.
What is the thermal derating behavior of the SMDA12-6E3/TR7 above 25 °C?
The SMDA12-6E3/TR7 exhibits a positive temperature coefficient of breakdown voltage (+10 mV/°C), meaning VBR increases linearly with junction temperature - improving overvoltage margin at elevated temperatures. Power dissipation capability decreases gradually above 25 °C per SO-8 thermal resistance (RθJA ≈ 120 °C/W); at 85 °C ambient, derated peak pulse power is approximately 240 W for 8/20 µs pulses. The SMDA12-6E3/TR7 maintains full functionality across its –55 °C to +150 °C operating range without parameter inversion or failure mode shift.
Is the SMDA12-6E3/TR7 compatible with lead-free reflow soldering processes?
Yes - the SMDA12-6E3/TR7 uses lead-free terminations and is rated for standard Pb-free reflow profiles, including peak temperatures up to 260 °C for 10 seconds per JEDEC J-STD-020. Its SO-8 package meets IPC/JEDEC moisture sensitivity level (MSL) 1, eliminating bake requirements prior to assembly. The SMDA12-6E3/TR7's molding compound and internal wire bonds are qualified for repeated thermal cycling, ensuring mechanical and electrical integrity after lead-free reflow, wave, and hand-soldering processes.
SMDA12-6E3/TR7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- TVSarray™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 6
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 24V
- Current - Peak Pulse (10/1000µs):
- 5A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 185pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SMDA12-6E3/TR7 FAQ
1.How can I place an order for SMDA12-6E3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDA12-6E3/TR7 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 SMDA12-6E3/TR7 reliable?
The price and inventory of SMDA12-6E3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDA12-6E3/TR7 is usually 5 days.
3.What payment methods are accepted for SMDA12-6E3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDA12-6E3/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDA12-6E3/TR7?
SMDA12-6E3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDA12-6E3/TR7 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 SMDA12-6E3/TR7?
For technical support, including SMDA12-6E3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDA12-6E3/TR7 requirements.
6.How does Aetrix verify that SMDA12-6E3/TR7 is sourced from the original manufacturer or authorized distributors?
All SMDA12-6E3/TR7 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 SMDA12-6E3/TR7 meets industry standards.
7.What is the process for return or replacement of SMDA12-6E3/TR7?
All SMDA12-6E3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with SMDA12-6E3/TR7, 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 SMDA12-6E3/TR7 part is unused and in its original packaging.
Return procedure for SMDA12-6E3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDA12-6E3/TR7 Tags
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