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Microchip Technology SMDA12-6/TR7
- Part No.:
- SMDA12-6/TR7
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SMDA12-6/TR7.pdf
- Description:
- TVS DIODE 12VWM 24VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:547
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Product details
Overview
SMDA12-6/TR7 from Microsemi (now Microchip Technology) is a unidirectional transient voltage suppressor (TVS) array in SO-8 package, rated for 300 W peak pulse power (8/20 µs), 12 V standoff voltage (VWM), and clamping voltage of 19.0 V at 1 A - designed to protect six I/O lines in industrial and telecom interface circuits against ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges.
For engineers reviewing the SMDA12-6/TR7 datasheet, SMDA12-6/TR7 pinout, SMDA12-6/TR7 application, or SMDA12-6/TR7 equivalent, key selection criteria include verified 12 V working voltage margin, sub-1 µA leakage at VWM, 185 pF line capacitance at 1 MHz, -55°C to +150°C operating range, and SO-8 board-level mounting compatibility with standard I/O transceivers.
Technical Context
This TVS array implements six independent unidirectional suppression channels in a single SO-8 surface-mount package, each channel featuring an avalanche diode structure optimized for fast response (<1 ns) to electrostatic discharge events. It operates with a defined pin #1 dot marking and shares common ground terminals (Pins 2 & 3), enabling compact protection of bidirectional or single-ended data buses without signal inversion.
The device is characterized per-line at 25°C with guaranteed breakdown voltage (VBR) ≥13.3 V at 1 mA, clamping voltage ≤24 V at 5 A, and temperature coefficient of VBR = +10 mV/°C - ensuring stable overvoltage threshold across its full -55°C to +150°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 12.0 V - maximum continuous operating voltage before conduction begins; matches 12 V rail systems without false triggering |
| Breakdown Voltage (VBR) | 13.3 V min @ 1 mA - ensures reliable turn-on during transients exceeding normal operating margins |
| Clamping Voltage (VC) | 19.0 V max @ 1 A - limits surge voltage seen by protected ICs to safe levels during ESD/EFT events |
| Peak Pulse Power | 300 W @ 8/20 µs waveform - sustains high-energy surges without degradation in industrial environments |
| Leakage Current (ID) | 1 µA max @ VWM - negligible loading on low-power I/O lines such as RS-232 or CAN transceivers |
| Capacitance (C) | 185 pF @ 0 V, 1 MHz - compatible with data rates up to ~10 Mbps in UART, SPI, or parallel bus applications |
| Operating Temperature | -55°C to +150°C - supports deployment in under-hood automotive, industrial PLC, and outdoor telecom equipment |
Pinout & Package
SO-8 surface-mount package with molded plastic body, 0.150–0.158 inch width, 0.053–0.069 inch height, and pin #1 identified by dot marking on top surface. Weight: 0.066 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | I/O Line 1 Anode | Unidirectional TVS anode input for first protected line; connects to external signal trace |
| 2 | GND | Common cathode return path for Channels 1–3; must be low-inductance connection to system ground plane |
| 3 | GND | Common cathode return path for Channels 4–6; electrically tied to Pin 2 internally or externally |
| 4 | I/O Line 2 Anode | Unidirectional TVS anode input for second protected line |
| 5 | I/O Line 3 Anode | Unidirectional TVS anode input for third protected line |
| 6 | I/O Line 4 Anode | Unidirectional TVS anode input for fourth protected line |
| 7 | I/O Line 5 Anode | Unidirectional TVS anode input for fifth protected line |
| 8 | I/O Line 6 Anode | Unidirectional TVS anode input for sixth protected line |
Key Features
| Feature | Design Value |
|---|---|
| 6-channel unidirectional protection | Enables simultaneous safeguarding of six discrete I/O lines (e.g., RS-485 A/B, CAN H/L, GPIO banks) with shared ground returns |
| IEC 61000-4-2 & -4-4 compliance | Validated for ±15 kV air discharge and ±8 kV contact discharge ESD immunity, plus 4 kV EFT burst tolerance |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes voltage overshoot during surge events, reducing stress on downstream CMOS/TTL receivers |
| 185 pF line capacitance | Preserves signal integrity on moderate-speed digital interfaces without requiring layout compensation |
| SO-8 tape-and-reel packaging | Supports automated SMT assembly with EIA-481-1-A standard carrier (2500 pcs/reel) |
Applications
| Industrial Serial Interfaces | Telecom Line Cards |
|---|---|
Use Scenario: Protection of RS-485 transceiver pairs in factory automation controllers exposed to cable-induced surges and ground potential differences. IC Role / Device Role / Timing Role: Board-level transient suppressor placed directly at connector entry point, shunting surge current to ground before reaching MAX485 or SN65HVD7x ICs. Use Value: Prevents latch-up or permanent damage to transceivers during 4 kV EFT bursts or 15 kV ESD events while maintaining <10 Mbps data integrity. | Use Scenario: Input protection for analog/digital hybrid line cards handling T1/E1 framing signals in central office equipment. IC Role / Device Role / Timing Role: Front-end TVS array safeguarding differential receiver inputs (e.g., DS26LS31) against secondary lightning surges coupled via long copper runs. Use Value: Limits induced transients to ≤24 V at 5 A, preserving signal timing margins and avoiding false frame sync loss in G.703-compliant systems. |
| Automotive Body Control Modules | Medical Diagnostic Equipment |
Use Scenario: Surge protection for LIN bus nodes and sensor I/O lines in under-dash ECUs subject to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamp on LIN TX/RX lines upstream of MC33661 or TLE6232G transceivers, referenced to chassis ground. Use Value: Withstands 300 W 8/20 µs pulses without parametric shift, ensuring functional safety compliance per ISO 26262 ASIL-B requirements. | Use Scenario: ESD hardening of patient-connected analog front-end (AFE) inputs in portable ultrasound or ECG devices. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS array placed at connector interface to prevent static discharge from compromising 24-bit ADC reference stability. Use Value: 185 pF capacitance avoids gain error in high-Z instrumentation amplifiers while meeting IEC 61000-4-2 Level 4 (±15 kV air) test requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMDA12-6 (no suffix) | Identical electrical specs and SO-8 footprint; differs only in packaging - bulk vs. TR7 tape-and-reel | No functional difference; same PCB layout and thermal performance | Select SMDA12-6/TR7 for automated SMT production; choose SMDA12-6 for prototyping or low-volume hand assembly |
| SMCJ12A | Single-channel 12 V TVS diode (DO-214AB), 1500 W rating, 27.2 V clamping @ 23.3 A - higher power but discrete per-line routing required | Requires six separate placements and six ground traces; less space-efficient than integrated 6-line array | Use SMCJ12A only when individual line isolation or >300 W per line is mandatory; otherwise SMDA12-6/TR7 reduces BOM count and layout complexity |
Compared with SMDA12-6/TR7, the bare SMDA12-6 offers identical protection performance but lacks tape-and-reel logistics for pick-and-place; the SMCJ12A delivers higher single-line surge capacity but increases PCB area, component count, and ground loop risk - making SMDA12-6/TR7 optimal for compact, high-channel-count board-level ESD/EFT protection.
Availability
SMDA12-6/TR7 is available at Aetrix Electronics and suitable for industrial serial interfaces, telecom line cards, automotive body control modules, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMDA12-6/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 TVS array product line was engineered specifically for board-level transient suppression in space-constrained, multi-line interface applications - emphasizing low capacitance, precise VWM matching, and robust IEC-compliant surge handling without sacrificing manufacturability.
FAQ
What is the standoff voltage rating of the SMDA12-6/TR7?
The SMDA12-6/TR7 has a standoff voltage (VWM) of 12.0 V, meaning it remains non-conductive under normal operation up to this DC or continuous peak AC voltage. This value is selected to match standard 12 V logic rails and interface buses while providing sufficient margin above typical operating voltages to avoid false triggering during noise or ripple events. The SMDA12-6/TR7 maintains this rating across its full -55°C to +150°C temperature range.
How does the SMDA12-6/TR7 differ from the SMDA12-6 without the /TR7 suffix?
The SMDA12-6/TR7 and SMDA12-6 share identical electrical specifications, thermal performance, and SO-8 mechanical dimensions. The /TR7 suffix denotes tape-and-reel packaging per EIA-481-1-A standard (2500 pieces per 13-inch reel), optimized for automated SMT placement. In contrast, the base SMDA12-6 is supplied in carrier tubes (95 pcs). No circuit or reliability differences exist between the two variants - the distinction is purely logistical and manufacturing-process oriented.
What is the clamping voltage of the SMDA12-6/TR7 at 5 A surge current?
The SMDA12-6/TR7 exhibits a maximum clamping voltage (VC) of 24 V when subjected to a 5 A transient current (8/20 µs waveform), as specified in the MSC0332A.PDF datasheet. This value defines the upper voltage limit imposed on protected lines during high-current surges, ensuring downstream components like RS-485 transceivers or microcontroller GPIOs remain within safe absolute maximum ratings. The clamping behavior is consistent across all six channels.
Is the SMDA12-6/TR7 suitable for protecting high-speed USB or HDMI signals?
No, the SMDA12-6/TR7 is not suitable for USB 2.0, USB 3.x, or HDMI signal lines due to its 185 pF line-to-ground capacitance, which would severely attenuate signals above ~10 Mbps and distort high-frequency eye diagrams. It is intended for moderate-speed interfaces such as RS-232, RS-485, CAN, LIN, and parallel I/O where bandwidth demands are below 20 MHz. For high-speed data lines, dedicated low-capacitance TVS arrays (e.g., <3 pF) are required - the SMDA12-6/TR7 does not meet those requirements.
Does the SMDA12-6/TR7 require external current-limiting resistors?
No, the SMDA12-6/TR7 does not require external series resistors for basic ESD/EFT protection. Its internal avalanche diode structure provides inherent dynamic resistance during clamping, and its 300 W peak power rating is validated without added impedance. However, in applications involving sustained overvoltage (e.g., prolonged 24 V fault conditions), a current-limiting resistor may be used upstream to prevent thermal runaway - but this is not part of standard ESD/EFT protection design using the SMDA12-6/TR7.
SMDA12-6/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
SMDA12-6/TR7 FAQ
1.How can I place an order for SMDA12-6/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDA12-6/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 SMDA12-6/TR7 reliable?
The price and inventory of SMDA12-6/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDA12-6/TR7 is usually 5 days.
3.What payment methods are accepted for SMDA12-6/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDA12-6/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDA12-6/TR7?
SMDA12-6/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDA12-6/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 SMDA12-6/TR7?
For technical support, including SMDA12-6/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDA12-6/TR7 requirements.
6.How does Aetrix verify that SMDA12-6/TR7 is sourced from the original manufacturer or authorized distributors?
All SMDA12-6/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 SMDA12-6/TR7 meets industry standards.
7.What is the process for return or replacement of SMDA12-6/TR7?
All SMDA12-6/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with SMDA12-6/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 SMDA12-6/TR7 part is unused and in its original packaging.
Return procedure for SMDA12-6/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDA12-6/TR7 Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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