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Diodes Incorporated SM12-7
- Part No.:
- SM12-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SM12-7.pdf
- Description:
- TVS DIODE 12VWM 19VC SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:17,865
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Product details
Overview
SM12-7 from Diodes Incorporated is a dual common-anode transient voltage suppression (TVS) diode designed for bidirectional ESD and surge protection on data and power lines. It delivers 300 W peak pulse power (8/20 μs), clamps at 19 V under 1 A surge, exhibits 95 pF capacitance at 0 V, and operates across –65 °C to +150 °C - deployed in USB 2.0 interface protection and industrial sensor I/O conditioning.
For engineers reviewing the SM12-7 datasheet, SM12-7 pinout, SM12-7 application, or SM12-7 equivalent, key selection criteria include its 12 V reverse working voltage, ±15 kV air/±8 kV contact ESD rating per IEC 61000-4-2, 13.3–15.75 V breakdown range, SOT23 package footprint, and dual-channel common-anode configuration for compact differential-line protection.
Technical Context
The SM12-7 integrates two TVS elements sharing a common anode terminal, enabling symmetrical clamping of both polarities on a single signal pair without external biasing. Its silicon avalanche structure provides fast response (<1 ns) to ESD transients and robust 40 A electrical fast transient (EFT) immunity per IEC 61000-4-4.
Designed for surface-mount use on FR-4 PCBs with Diodes' AP02001 pad layout, it maintains thermal resistance of 500 °C/W (junction-to-ambient) and derates linearly above 25 °C ambient - supporting reliable operation in automotive under-hood and industrial control environments where temperature cycling and surge exposure coexist.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 300 W (8/20 μs waveform): sustains repeated surges without degradation in USB or RS-485 line protection |
| Reverse Working Voltage | 12.0 V: matches standard 12 V logic and supply rails, preventing leakage during normal operation |
| Clamping Voltage | 19 V @ 1 A: limits transient overvoltage to safe levels for downstream 3.3 V/5 V interface ICs |
| ESD Rating | ±15 kV air / ±8 kV contact (IEC 61000-4-2): exceeds industrial immunity requirements for exposed connectors |
| Capacitance | 95 pF @ 0 V, 1 MHz: low enough for USB 2.0 (480 Mbps) signal integrity with minimal jitter impact |
| Breakdown Voltage | 13.3–15.75 V @ 1 mA: ensures consistent avalanche initiation across production lots and temperature |
| Operating Temp Range | –65 °C to +150 °C: qualified per AEC-Q101, suitable for automotive engine control and industrial PLC modules |
Pinout & Package
Package: SOT23 - 3-pin plastic surface-mount package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (common) | Shared cathode return path for both TVS channels; connects to system ground or local reference plane |
| Pin 2 | Cathode (Channel A) | Protects first signal line (e.g., USB D+); clamps positive/negative transients to common anode |
| Pin 3 | Cathode (Channel B) | Protects second signal line (e.g., USB D−); enables differential-mode surge suppression in one device |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Reduces component count by 50% vs. discrete TVS pairs; eliminates need for external anode tie trace |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
| Halogen- and antimony-free "Green" construction | Meets <900 ppm Br/Cl and <1000 ppm Sb; compliant with global environmental regulations beyond RoHS |
| Low 0.0089 g weight | Minimizes mechanical stress on fine-pitch PCBs during thermal cycling and vibration |
| Lead-free matte tin plating | Ensures solderability per MIL-STD-202 Method 208 and compatibility with Pb-free reflow profiles |
Applications
| USB 2.0 Interface Protection | Industrial Sensor I/O Conditioning |
|---|---|
Use Scenario: Protecting USB D+/D− lines on embedded host controllers against ESD events from hot-plug insertion and handling. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed directly at connector, clamping surges before they reach PHY or controller pins. Use Value: 95 pF capacitance preserves signal rise/fall times; 19 V clamping prevents latch-up in 3.3 V USB transceivers. | Use Scenario: Shielding analog 4–20 mA current loop inputs in programmable logic controllers from induced lightning surges and switching noise. IC Role / Device Role / Timing Role: Common-anode dual TVS shunting differential transients between loop wires while referencing system ground. Use Value: 300 W peak power withstands 1 kV/μs ring wave surges; –65 °C to +150 °C range supports outdoor cabinet deployment. |
| Automotive Body Control Module (BCM) | RS-485 Fieldbus Node Protection |
Use Scenario: Safeguarding LIN bus or CAN FD auxiliary lines in door modules and lighting control units exposed to load dump and ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS array suppressing fast transients on bidirectional communication lines without distorting signal edges. Use Value: AEC-Q101 qualification ensures survival under automotive temperature and vibration stress; ±15 kV ESD rating covers assembly-line handling. | Use Scenario: Protecting half-duplex RS-485 transceivers in building automation gateways from cable-induced surges and ground potential differences. IC Role / Device Role / Timing Role: Dual-channel clamp limiting differential and common-mode overvoltages on A/B bus lines relative to GND. Use Value: 40 A EFT immunity meets IEC 61000-4-4 Level 4; SOT23 footprint allows placement adjacent to connector for shortest possible path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Single-channel, 400 W PPP, 12 V VRWM, DO-214AC package (larger than SOT23) | Requires two devices and board area for dual-line protection; higher thermal mass slows response slightly | Choose when higher surge margin is needed and space permits larger package |
| TPD2E001DRYR | Single-channel, 3.6 V VRWM, 12 pF CT, 0.65 mm × 0.65 mm DSBGA | Optimized for high-speed digital interfaces (e.g., HDMI, MIPI); insufficient for 12 V line protection | Choose only for low-voltage, ultra-low-capacitance applications - not a functional substitute for SM12-7 |
Compared with SMAJ12A and TPD2E001DRYR, the SM12-7 uniquely combines dual-channel integration, 12 V operating voltage, and SOT23 size - making it optimal for space-constrained 12 V data line protection where board real estate and component count are critical.
Availability
SM12-7 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial sensor I/O conditioning, and RS-485 fieldbus node protection requiring stable component supply and long-term manufacturability.
Supply support for SM12-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions.
The SM12-7 belongs to Diodes' TVS Diode family, engineered specifically for compact, high-efficiency ESD and surge suppression in space-constrained industrial and automotive interfaces.
FAQ
What is the maximum clamping voltage of the SM12-7 under surge conditions?
The SM12-7 clamps to a maximum of 19 V when subjected to a 1 A, 8/20 μs surge current pulse. This value is measured at the device terminals and represents the peak voltage seen by downstream circuitry during transient events - critical for ensuring compatibility with 3.3 V or 5 V interface ICs.
Can the SM12-7 be used for unidirectional protection?
No - the SM12-7 is inherently bidirectional due to its dual common-anode structure. Each cathode pin conducts avalanche current for both positive and negative transients relative to the shared anode. For unidirectional protection, a single-channel TVS like SMAJ12A would be required.
Is the SM12-7 compatible with lead-free reflow soldering processes?
Yes - the SM12-7 features matte tin plating over Alloy 42 leadframe and is qualified for Pb-free reflow per JEDEC J-STD-020. Its moisture sensitivity level is 1, eliminating bake requirements prior to assembly, and it withstands peak temperatures up to 260 °C for 10 seconds.
How does the SM12-7's capacitance affect high-speed signal integrity?
With 95 pF total capacitance at 0 V and 1 MHz, the SM12-7 introduces minimal loading on USB 2.0 signals (480 Mbps), preserving edge rates and eye diagram margins. Its capacitance decreases with increasing reverse bias, further reducing impact during active data transmission.
SM12-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19V
- Current - Peak Pulse (10/1000µs):
- 12A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 95pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SM12-7 FAQ
1.How can I place an order for SM12-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM12-7 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 SM12-7 reliable?
The price and inventory of SM12-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM12-7 is usually 5 days.
3.What payment methods are accepted for SM12-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM12-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM12-7?
SM12-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM12-7 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 SM12-7?
For technical support, including SM12-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM12-7 requirements.
6.How does Aetrix verify that SM12-7 is sourced from the original manufacturer or authorized distributors?
All SM12-7 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 SM12-7 meets industry standards.
7.What is the process for return or replacement of SM12-7?
All SM12-7 units undergo pre-shipment inspection (PSI). If there is an issue with SM12-7, 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 SM12-7 part is unused and in its original packaging.
Return procedure for SM12-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM12-7 Tags
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ESD9B5.0ST5G
onsemi
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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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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