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onsemi SMF12CT1
- Part No.:
- SMF12CT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
SMF12CT1.pdf
- Description:
- TVS ARRAY 5LINE 100W 12V SC88
- Quantity:
- Payment:
- Shipping:
Inventory:7,809
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Product details
Overview
SMF12CT1 from onsemi is a 5-line ESD and transient voltage protection diode array in SC-88 package, featuring 12 V reverse working voltage (VRWM), 13.3–15 V breakdown voltage (VBR), and 21 V clamping voltage at 3 A (8 × 20 µs). It delivers 100 W peak power dissipation and meets IEC 61000-4-2 (15 kV air / 8 kV contact) for surge protection in automotive electronics and serial port interfaces.
For engineers reviewing the SMF12CT1 datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, SC-88 terminal mapping, real-world use cases in automotive and telecom systems, and two validated alternative parts with documented differences in clamping behavior and qualification scope.
Technical Context
This monolithic common-anode ESD protection array integrates five independent cathodes and one shared anode in a single SC-88 (Case 419B, Style 24) package. Its design enables simultaneous protection of five signal lines without cross-talk, with junction capacitance of 40–60 pF per line at 0 V bias and 1 MHz.
The device operates across −40 °C to +125 °C junction temperature range and supports lead-free reflow up to 260 °C for 10 seconds. It is rated for 8 kV HBM ESD (Class 3B) and 400 V MM (Class C), with flammability compliance to UL 94 V-0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Working Voltage (VRWM) | 12 V - maximum continuous DC or peak operating voltage the protected line can sustain without conduction |
| Breakdown Voltage (VBR) | 13.3–15 V at IT = 1 mA - defines onset of avalanche clamping; ensures reliable turn-on before system damage |
| Clamping Voltage (VC) | 21 V at IPP = 3 A (8 × 20 µs) - limits transient voltage seen by downstream ICs during surge events |
| Peak Pulse Current (IPP) | 6.0 A (8 × 20 µs) - maximum non-repetitive surge current the device can safely shunt to ground |
| Junction Capacitance (CJ) | 40–60 pF at VR = 0 V, 1 MHz - low enough to avoid signal integrity degradation on high-speed data lines like USB or CAN |
| ESD Rating | 15 kV air / 8 kV contact per IEC 61000-4-2 - exceeds industrial and automotive ESD immunity requirements |
| Operating Temperature | −40 °C to +125 °C - supports under-hood automotive and industrial ambient conditions |
Pinout & Package
SMF12CT1 uses the SC-88 (Case 419B, Style 24) surface-mount package measuring 2.00 × 1.25 × 0.90 mm with 0.65 mm pitch. Pin 1 is marked with a dot or beveled corner; orientation follows standard SC-88 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (Line 1) | Protected signal path #1 - connects to I/O line requiring ESD suppression |
| 2 | Anode (Common) | Shared return path to ground or TVS reference node - must be low-inductance connection |
| 3 | Cathode (Line 2) | Protected signal path #2 - electrically isolated from other cathodes except via common anode |
| 4 | Cathode (Line 3) | Protected signal path #3 - enables compact multi-line protection without discrete diodes |
| 5 | Cathode (Line 4) | Protected signal path #4 - maintains <60 pF capacitance per line for minimal signal loading |
| 6 | Cathode (Line 5) | Protected signal path #5 - all five cathodes share identical VRWM and VC specs per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| 5-line monolithic protection | Reduces PCB footprint vs. five discrete diodes; eliminates inter-cathode mismatch in clamping response |
| 100 W peak power rating | Handles high-energy transients such as ISO 7637-2 pulse 1/2b in automotive 12 V systems |
| IEC 61000-4-2 compliance | Validated 15 kV air / 8 kV contact ESD robustness - suitable for unshielded external ports |
| AEC-Q101 qualified (SZ variant) | SMF12CT1 is not AEC-Q101 qualified; SZSMF12CT1G is the automotive-grade version with PPAP support |
| Pb-free SC-88 package | RoHS-compliant construction with 260 °C reflow capability - compatible with standard SMT assembly |
Applications
| Automotive Infotainment Interfaces | Industrial Ethernet Ports |
|---|---|
Use Scenario: Protecting LVDS or UART lines between head unit and display module in passenger compartment. IC Role / Device Role / Timing Role: ESD transient suppressor placed directly at connector entry point, before level-shifter or PHY IC. Use Value: Clamps 8 kV contact ESD events to ≤23 V within nanoseconds, preventing latch-up or gate oxide damage in 3.3 V logic interfaces. |
Use Scenario: Shielding RJ45 PHY differential pairs and MDI pins against ESD and lightning-induced surges in factory automation switches. IC Role / Device Role / Timing Role: Common-anode TVS array bridging each pair to chassis ground, leveraging low 40–60 pF capacitance to preserve signal rise time. Use Value: Limits transient overvoltage to 21–23 V at 3–6 A surges while maintaining <1 ns response time and supporting 100 Mbps Ethernet integrity. |
| Notebook USB 2.0 Data Lines | Automotive CAN FD Transceiver Protection |
Use Scenario: Guarding D+ and D− lines on Type-A USB ports exposed to user handling in portable computing devices. IC Role / Device Role / Timing Role: Bidirectional ESD clamp placed immediately adjacent to connector, with cathodes tied to D+/D− and anode to ground. Use Value: Provides 15 kV air-gap ESD immunity while adding only 50 pF total capacitance - avoids USB 2.0 eye diagram distortion. |
Use Scenario: Safeguarding CAN_H and CAN_L pins of a TJA1043 transceiver in 12 V vehicle networks subject to load dump and jump-start transients. IC Role / Device Role / Timing Role: Dual-line TVS array where Pins 1 & 3 protect CAN_H/CAN_L, Pin 2 serves as common anode tied to battery ground. Use Value: Clamps 6 A transients to ≤23 V, ensuring transceiver survival during ISO 16750-2 pulse 4a (load dump) and ISO 7637-2 pulse 1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZSMF12CT1G | AEC-Q101 qualified; same VRWM, VBR, and VC specs; includes PPAP documentation and automotive change control | Required for production automotive ECUs; supports full traceability and qualification reporting | Select SZSMF12CT1G when automotive OEM compliance (e.g., Ford, GM, VW) is mandatory |
| TPD2E001DRYR | Lower VRWM (5 V); lower clamping (9 V @ 1 A); higher capacitance (100 pF); dual-line only; no IEC 61000-4-2 contact rating | Better suited for low-voltage USB or HDMI; lacks 12 V system compatibility and automotive surge margin | Choose TPD2E001DRYR only for 3.3 V/5 V consumer interfaces where 12 V VRWM is unnecessary |
Compared with SMF12CT1, SZSMF12CT1G adds automotive qualification without altering electrical performance, while TPD2E001DRYR trades off voltage rating and surge capability for lower capacitance in sub-5 V applications - neither is pin-compatible, but both serve distinct protection tiers.
Availability
SMF12CT1 is available at Aetrix Electronics and suitable for automotive infotainment interfaces, industrial Ethernet ports, and notebook USB 2.0 data lines requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for SMF12CT1 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, sensor, and ESD protection solutions for automotive, industrial, and computing markets.
The SMFxxCT1G series belongs to onsemi's transient voltage suppression portfolio, engineered specifically for compact, multi-line ESD protection in space-constrained PCB layouts with stringent IEC and AEC compliance needs.
FAQ
What is the maximum clamping voltage of SMF12CT1 under a 6 A transient?
The SMF12CT1 clamps to 23 V when subjected to a 6 A, 8 × 20 µs surge waveform, as specified in its Electrical Characteristics table. This value ensures downstream 12 V-rated ICs remain within safe operating limits during high-energy transients. The clamping behavior is consistent across all five protected lines due to monolithic construction. SMF12CT1 maintains this performance across its full −40 °C to +125 °C operating range.
Is SMF12CT1 AEC-Q101 qualified?
No, SMF12CT1 is not AEC-Q101 qualified. The automotive-grade variant is SZSMF12CT1G, which carries full AEC-Q101 certification, PPAP documentation, and enhanced change control for automotive production. SMF12CT1 is intended for industrial and commercial applications where automotive qualification is not required. Engineers selecting for automotive use must specify SZSMF12CT1G instead of SMF12CT1.
How many signal lines does SMF12CT1 protect, and how are they configured?
SMF12CT1 protects exactly five independent signal lines using a monolithic common-anode architecture. Pins 1, 3, 4, 5, and 6 serve as individual cathodes for each line, while Pin 2 is the shared anode connected to ground or TVS reference. This configuration allows simultaneous protection without interaction between lines and occupies less than 2.5 mm² PCB area - significantly smaller than five discrete diodes.
What is the junction capacitance of SMF12CT1, and why does it matter?
The SMF12CT1 exhibits 40–60 pF junction capacitance per line at 0 V bias and 1 MHz, measured line-to-ground. This low capacitance prevents signal integrity degradation on high-speed interfaces such as USB 2.0 or CAN FD, where excessive capacitance would distort edge rates or cause reflections. The value is confirmed in the datasheet's Electrical Characteristics table and applies identically to all five protected lines.
Can SMF12CT1 replace SMF05CT1G in a 5 V system?
No, SMF12CT1 is not a direct replacement for SMF05CT1G in 5 V systems. Its 12 V reverse working voltage (VRWM) exceeds typical 5 V rail margins, risking leakage or premature conduction. SMF05CT1G has VRWM = 5 V and clamps at 9.8 V @ 5 A - better matched to 5 V logic. Substituting SMF12CT1 could result in elevated standby current or failure to clamp effectively during low-voltage transients. Always match VRWM to the protected line's maximum steady-state voltage.
SMF12CT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SMF12CT1 FAQ
1.How can I place an order for SMF12CT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF12CT1 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 SMF12CT1 reliable?
The price and inventory of SMF12CT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF12CT1 is usually 5 days.
3.What payment methods are accepted for SMF12CT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF12CT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF12CT1?
SMF12CT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF12CT1 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 SMF12CT1?
For technical support, including SMF12CT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF12CT1 requirements.
6.How does Aetrix verify that SMF12CT1 is sourced from the original manufacturer or authorized distributors?
All SMF12CT1 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 SMF12CT1 meets industry standards.
7.What is the process for return or replacement of SMF12CT1?
All SMF12CT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF12CT1, 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 SMF12CT1 part is unused and in its original packaging.
Return procedure for SMF12CT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF12CT1 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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