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onsemi SMF24CT1
- Part No.:
- SMF24CT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
SMF24CT1.pdf
- Description:
- TVS DIODE 24VWM 44VC SC88/SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:8,573
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Product details
Overview
SMF24CT1 from onsemi is a 5-line monolithic transient voltage suppressor (TVS) array in SC-88 package, designed for ESD and surge protection of high-speed data lines. It features 24 V reverse working voltage (VRWM), 40 V clamping voltage at 1 A pulse, 2.5 A peak pulse current, 21–25 pF line-to-GND capacitance, and IEC 61000-4-2 ±15 kV air / ±8 kV contact ESD compliance - used in automotive infotainment serial interfaces.
For engineers reviewing the SMF24CT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system DC bus voltage, clamping voltage margin relative to IC absolute maximum ratings, junction capacitance impact on signal integrity, and SC-88 footprint compatibility with space-constrained PCB layouts.
Technical Context
The SMF24CT1 implements a common-anode 5-channel TVS architecture: one shared anode (Pin 2) and five independent cathodes (Pins 1, 3–6), enabling simultaneous protection of five unidirectional signal lines without cross-talk. Its silicon avalanche structure delivers fast response (<1 ns) to ESD transients and robust 100 W peak power handling per line under 8/20 µs waveform.
It operates across −40 °C to +125 °C junction temperature range and meets UL 94 V-0 flammability rating. The device is Pb-free, RoHS-compliant, and qualified per AEC-Q101 for automotive use - supporting reliable operation in harsh environments where voltage transients exceed I/O pin tolerances.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Working Voltage (VRWM) | 24 V - maximum continuous DC or peak AC voltage the device blocks without conduction; must exceed protected line's operating voltage. |
| Breakdown Voltage (VBR) | 26.7–32 V at 1 mA - onset of avalanche conduction; defines minimum overvoltage threshold before clamping engages. |
| Clamping Voltage (VC) | 40 V at 1 A, 44 V at 2.5 A (8×20 µs) - maximum voltage seen by downstream IC during surge; critical for staying below IC absolute max ratings. |
| Junction Capacitance (CJ) | 21–25 pF at 0 V, 1 MHz - low enough for USB 2.0, CAN, LIN, and RS-485 signal integrity; avoids excessive rise-time degradation. |
| Peak Pulse Current (IPP) | 2.5 A (8×20 µs) - maximum single-event surge current per line the device safely clamps without failure. |
| ESD Rating | ±15 kV air / ±8 kV contact per IEC 61000-4-2 - exceeds industrial and automotive ESD immunity requirements for exposed ports. |
| Package | SC-88 (Case 419B, Style 24) - 6-pin, 2.0 × 1.25 × 0.95 mm surface-mount package with standard SOT-363 footprint compatibility. |
Pinout & Package
SC-88 package (Case 419B, Style 24) with 6-pin configuration: compact 2.0 mm × 1.25 mm body, 0.65 mm pitch, gull-wing leads, and Pb-free finish. Pin 1 marked with dot; orientation matches standard SC-88 tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Line 1) | Protected signal line #1 - connects to I/O trace; conducts surge current to common anode when voltage exceeds VBR. |
| Pin 2 | Anode (Common) | Shared return path to GND or low-impedance reference; must be routed with minimal inductance for effective clamping. |
| Pin 3 | Cathode (Line 2) | Protected signal line #2 - electrically isolated from other cathodes; enables independent protection of parallel buses. |
| Pin 4 | Cathode (Line 3) | Protected signal line #3 - supports multi-line interface protection (e.g., CAN_H/CAN_L + two diagnostics lines) in single footprint. |
| Pin 5 | Cathode (Line 4) | Protected signal line #4 - allows consolidation of up to five low-voltage digital or analog signals into one ESD solution. |
| Pin 6 | Cathode (Line 5) | Protected signal line #5 - completes full 5-line protection set; no internal connection between cathodes ensures channel independence. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic 5-line common-anode array | Single SC-88 package replaces five discrete TVS diodes - reduces board area by >60% and eliminates routing complexity. |
| 100 W peak pulse power per line | Handles severe 8/20 µs surges (e.g., ISO 7637-2 Pulse 1/2a/3a) without degradation - supports automotive load-dump and inductive switching immunity. |
| IEC 61000-4-2 ±15 kV air / ±8 kV contact | Meets highest ESD immunity class for external connectors - eliminates need for secondary board-level ESD protection in certified designs. |
| Low 21–25 pF junction capacitance | Preserves signal edge rate for 10–50 Mbps interfaces (e.g., LIN, SENT, CAN FD physical layer) - avoids bit error rate increase due to RC filtering. |
| UL 94 V-0 flammability rating | Self-extinguishing epoxy mold compound - satisfies safety requirements for enclosed automotive and industrial enclosures. |
Applications
| Automotive LIN Bus Protection | Industrial RS-485 Port Protection |
|---|---|
|
Use Scenario: Protecting LIN transceiver pins (LIN_Bus, Wake-Up, GND sense) against battery transients and ESD in body control modules. IC Role / Device Role: Unidirectional TVS array clamping overvoltage on five LIN-related signal paths to prevent transceiver latch-up or damage. Use Value: Enables single-component protection of full LIN subsystem with verified 125 °C operation and AEC-Q101 qualification - reducing BOM count and test overhead. |
Use Scenario: Safeguarding RS-485 transceiver A/B/Y/Z/RE pins in factory automation gateways exposed to motor drive noise and cable ESD. IC Role / Device Role: Common-anode TVS array suppressing differential-mode surges and common-mode ESD on all five RS-485 interface nodes simultaneously. Use Value: Maintains <25 pF capacitance to preserve 25 Mbps signal integrity while delivering 44 V clamping at 2.5 A - meeting IEC 61000-4-4 Level 4 immunity. |
| USB 2.0 Data Line Protection | Automotive Camera Serial Interface (CSI-2) |
|
Use Scenario: Shielding D+/D−, VBUS detect, ID, and GND sense lines in automotive USB host ports from hot-plug ESD and load dump coupling. IC Role / Device Role: Low-capacitance TVS array protecting four data/control lines plus reference ground - preserving USB 2.0 eye diagram compliance. Use Value: 21–25 pF capacitance limits insertion loss to <0.5 dB at 480 MHz; 40 V clamping ensures USB PHY VDDIO (3.3 V) remains within safe margin. |
Use Scenario: Securing MIPI CSI-2 clock, data lanes (CLKP/N, DAT0P/N, DAT1P/N), and reset lines in ADAS camera modules mounted near engine compartments. IC Role / Device Role: Five-channel TVS array placed at connector entry point to shunt ESD and radiated RF energy before reaching image sensor SoC inputs. Use Value: Validated −40 °C to +125 °C operation and 100 W pulse rating withstand repeated thermal cycling and under-hood transients - extending field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Single-line SMA package; 24 V VRWM, 38.9 V VC @ 5.2 A; higher capacitance (~500 pF); no multi-line integration. | Requires five discrete devices + extra PCB area; unsuitable for high-speed interfaces due to high CJ. | Choose only if legacy SMA footprint reuse is mandatory and signal speed <1 Mbps. |
| SP1006-02HTG | 5-line SC-70 package; 24 V VRWM, 43 V VC @ 2 A; 20 pF CJ; same pinout but different marking and thermal derating curve. | Compatible layout but lower peak power (60 W vs 100 W); validated for telecom ESD only (not AEC-Q101). | Select when automotive qualification is not required and ambient temperature stays <85 °C. |
Compared with SMAJ24A and SP1006-02HTG, the SMF24CT1 delivers superior integration density, higher surge robustness (100 W), AEC-Q101 qualification, and tighter clamping margin - making it the preferred choice for next-generation automotive and industrial multi-line interfaces where space, reliability, and signal fidelity are constrained.
Availability
SMF24CT1 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, and USB 2.0 peripheral interfaces requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified surge protection.
Supply support for SMF24CT1 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 management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SMF24CT1 belongs to onsemi's transient voltage suppressor array product line, engineered specifically for compact, high-reliability ESD and surge protection of multi-line communication interfaces in automotive and industrial environments.
FAQ
What is the maximum operating temperature for the SMF24CT1?
The SMF24CT1 has a specified operating junction temperature range of −40 °C to +125 °C. This rating is validated per AEC-Q101 stress testing and supports deployment in under-hood automotive locations and industrial enclosures without thermal derating up to 125 °C ambient when PCB copper area and airflow meet datasheet layout guidelines. The SMF24CT1 maintains full clamping performance across this range.
Is the SMF24CT1 pin-compatible with other SMFxxCT1 variants?
Yes - all SMFxxCT1 devices (SMF05CT1, SMF12CT1, SMF15CT1, SMF24CT1) share identical SC-88 package dimensions, pin assignment (Pin 2 = common anode), and mechanical footprint. Only electrical parameters differ: VRWM, VBR, VC, and IPP scale with voltage rating. This allows design reuse across voltage grades without PCB revision.
Does the SMF24CT1 support bidirectional signal protection?
No - the SMF24CT1 is a unidirectional TVS array with a common-anode configuration. It protects only positive-going transients on cathode-connected lines. For bidirectional protection (e.g., RS-485 differential pairs), external series resistors or complementary TVS arrangements are required. The SMF24CT1 is intended for grounded-reference signal lines like LIN, USB, or single-ended logic.
What is the lead time and minimum order quantity for SMF24CT1 at Aetrix Electronics?
Aetrix Electronics maintains active inventory of SMF24CT1 with standard lead time of 2–3 business days for orders ≤10,000 units. Minimum order quantity is 3,000 pieces (one full tape-and-reel). Volume pricing and extended lead-time scheduling are available for forecast-based procurement programs covering SMF24CT1 and related onsemi TVS arrays.
How does the SMF24CT1 compare to discrete TVS diodes in terms of PCB layout efficiency?
The SMF24CT1 integrates five TVS elements into a single SC-88 footprint (2.0 × 1.25 mm), reducing total board area by over 60% versus five discrete SOD-323 devices. It eliminates five separate GND vias and minimizes trace inductance via shared anode routing - improving clamping consistency and ESD response time. Layout of SMF24CT1 requires only one compact decoupling capacitor near the common anode, simplifying routing versus discrete alternatives.
SMF24CT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 5
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V (Max)
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 44V
- Current - Peak Pulse (10/1000µs):
- 2.5A (8/20µs)
- Power - Peak Pulse:
- 100W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 21pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-88/SC70-6/SOT-363
SMF24CT1 FAQ
1.How can I place an order for SMF24CT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF24CT1 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 SMF24CT1 reliable?
The price and inventory of SMF24CT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF24CT1 is usually 5 days.
3.What payment methods are accepted for SMF24CT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF24CT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF24CT1?
SMF24CT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF24CT1 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 SMF24CT1?
For technical support, including SMF24CT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF24CT1 requirements.
6.How does Aetrix verify that SMF24CT1 is sourced from the original manufacturer or authorized distributors?
All SMF24CT1 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 SMF24CT1 meets industry standards.
7.What is the process for return or replacement of SMF24CT1?
All SMF24CT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF24CT1, 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 SMF24CT1 part is unused and in its original packaging.
Return procedure for SMF24CT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF24CT1 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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