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onsemi CM1218-04SE
- Part No.:
- CM1218-04SE
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
CM1218-04SE.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:207,500
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Product details
Overview
CM1218-04SE from onsemi is a 4-channel low-capacitance transient voltage suppressor (TVS) array designed for ESD protection of high-speed data lines. It delivers ±15 kV IEC 61000−4−2 contact discharge protection, 7 pF typical channel input capacitance, and 5.5 V reverse stand-off voltage, making it suitable for USB 2.0, HDMI, and other compact interface ports.
For engineers reviewing the CM1218-04SE datasheet, pinout, applications, or equivalent options, key selection considerations include its SOT-553 package footprint, 4-channel cathode-anode-cathode-cathode configuration, leakage current ≤1 µA at 5.0 V, and ability to withstand >1000 ESD strikes per pin without degradation.
Technical Context
The CM1218-04SE implements a monolithic TVS diode array with four independent unidirectional channels sharing a common anode (VN), enabling compact, low-capacitance clamping of signal lines to ground. Its architecture supports simultaneous protection of differential or single-ended I/Os without cross-talk coupling.
Each channel features a low dynamic resistance (1.1 Ω forward, 2.7 Ω reverse) and fast response time (<1 ns), ensuring effective clamping during ESD transients while preserving signal integrity in high-speed digital interfaces up to 480 Mbps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 4 independent ESD protection channels |
| Input Capacitance | 7 pF typical per channel - preserves signal rise/fall times in USB 2.0 and similar high-speed links |
| Reverse Stand-off Voltage | 5.5 V min - ensures no conduction during normal 5 V operation, avoiding false triggering |
| ESD Withstand (IEC 61000−4−2) | ±15 kV contact discharge - meets industrial and consumer immunity requirements |
| Leakage Current | ≤1 µA at 5.0 VDC - prevents loading of sensitive analog or logic inputs |
| Clamp Voltage (±10 mA) | +6.8 V / −0.8 V - limits transient overvoltage to safe levels for downstream ICs |
| Operating Temperature | −40°C to +85°C - supports commercial and extended industrial environments |
Pinout & Package
SOT-553 (Case 463B), 5-lead surface-mount package measuring 1.60 × 1.60 × 0.55 mm - optimized for space-constrained portable electronics layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (CH1) | Protected I/O line 1 - connects directly to signal trace requiring ESD clamping |
| 2 | Anode (VN) | Common anode node - must be connected to system ground for all channels to function |
| 3 | Cathode (CH2) | Protected I/O line 2 - electrically isolated from CH1 but shares VN reference |
| 4 | Cathode (CH3) | Protected I/O line 3 - enables 3-signal protection in same footprint as dual-channel alternatives |
| 5 | Cathode (CH4) | Protected I/O line 4 - completes full 4-line interface protection (e.g., USB D+, D−, ID, VBUS sense) |
Key Features
| Feature | Design Value |
|---|---|
| Low I/O capacitance | 7 pF typical per channel - minimizes signal distortion and insertion loss in 480 Mbps USB 2.0 paths |
| High ESD endurance | Withstands >1000 ±15 kV IEC 61000−4−2 strikes per pin - ensures long-term reliability in production test and field use |
| Pb-free construction | RoHS-compliant SOT-553 package - meets global environmental compliance and reflow soldering standards |
| Compact footprint | 1.6 mm × 1.6 mm body - saves >50% board area versus legacy SOIC or SOT-23-5 solutions |
| Unidirectional topology | Four cathodes + shared anode - provides precise clamping to ground without DC path to VCC |
Applications
| USB 2.0 Interface Protection | HDMI Data Lane Protection |
|---|---|
Use Scenario: Protecting D+ and D− differential pair plus ID and VBUS sense lines in smartphone docking connectors. IC Role / Device Role / Timing Role: Transient voltage suppressor array providing bidirectional ESD clamping for four discrete signal nodes. Use Value: Prevents latch-up or gate oxide damage in USB PHY ICs during hot-plug events while maintaining <100 ps timing skew between D+/D−. |
Use Scenario: Shielding TMDS clock and data channels in portable media players against ESD during cable insertion. IC Role / Device Role / Timing Role: Low-capacitance TVS array placed adjacent to HDMI connector to clamp transients before reaching serializer IC. Use Value: Maintains 720p/1080p signal fidelity by limiting channel capacitance to 7 pF and clamping overshoot to ≤6.8 V. |
| Industrial Serial Port Protection | Medical Sensor Interface Protection |
Use Scenario: Safeguarding RS-485 transceiver pins exposed on field-serviceable diagnostic equipment panels. IC Role / Device Role / Timing Role: Four-channel ESD protector applied to A/B/data enable/control lines in half-duplex bus systems. Use Value: Enables robust operation in hospital environments where static discharge exceeds ±12 kV, meeting IEC 61000−4−2 Level 4. |
Use Scenario: Protecting analog front-end inputs (ECG leads, SpO₂ photodiode outputs) in handheld patient monitors. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS array preventing ESD-induced offset drift or saturation in precision amplifier stages. Use Value: Preserves DC accuracy and noise floor by avoiding parasitic conduction paths while delivering ±15 kV contact immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CM1218-04SO | SOT-23-5 package (2.90 × 2.80 × 1.45 mm); higher profile and larger footprint than SOT-553 | Better thermal dissipation in high-power surge scenarios; less suitable for ultra-thin mobile designs | Select when board height >0.6 mm is acceptable and layout allows larger pad geometry |
| TPD4E05U06DQAR | Texas Instruments part; 0.5 pF lower capacitance (6.5 pF typ), but rated only to ±12 kV IEC 61000−4−2 | Preferred for USB 3.0 Gen 1 where sub-7 pF is critical; insufficient for industrial ±15 kV requirement | Choose only if ESD immunity requirement is ≤±12 kV and signal bandwidth exceeds 5 Gbps |
Compared with CM1218-04SO, the CM1218-04SE offers 63% smaller footprint and 62% lower height - essential for modern smartphones and wearables - while matching full ±15 kV IEC immunity; versus TPD4E05U06DQAR, it trades 0.5 pF capacitance for guaranteed industrial-grade ESD robustness and broader application coverage.
Availability
CM1218-04SE is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI data lane safeguarding, and industrial serial port hardening requiring stable component supply across high-volume consumer and medical device programs.
Supply support for CM1218-04SE 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 logic devices for automotive, industrial, cloud, and consumer markets.
The CM1218 family was developed specifically for high-density, low-capacitance ESD protection in space-constrained portable electronics - targeting USB, HDMI, and proprietary high-speed interconnects where signal integrity and board real estate are critical.
FAQ
What is the maximum operating temperature range for the CM1218-04SE?
The CM1218-04SE is rated for continuous operation from −40°C to +85°C, aligning with commercial and extended industrial temperature requirements. This range is validated per Table 2 of the official datasheet (Rev. 4, February 2011) and applies to all electrical characteristics including leakage current, clamping voltage, and ESD endurance. The SOT-553 package's thermal resistance supports reliable performance within this envelope under typical PCB copper pour conditions.
Does the CM1218-04SE support bidirectional ESD protection?
No - the CM1218-04SE implements a unidirectional TVS architecture with four cathodes tied to protected signal lines and a shared anode (Pin 2) that must be connected to system ground. It clamps positive transients to ground and negative transients below ground (−0.8 V at −10 mA), but does not provide symmetrical ±V clamping like a true bidirectional device. For bidirectional protection, external series resistors or complementary diode pairs would be required.
Can the CM1218-04SE be used to protect USB 3.0 SuperSpeed lanes?
No - the CM1218-04SE is not recommended for USB 3.0 SuperSpeed (5 Gbps) differential lanes. Its 7 pF typical capacitance introduces excessive insertion loss and return loss degradation above 1 GHz, and its clamping behavior is optimized for lower-frequency transients (IEC 61000−4−2). USB 3.0 requires sub-0.5 pF solutions such as specialized high-speed ESD arrays; the CM1218-04SE is validated for USB 2.0 (480 Mbps) and similar lower-bandwidth interfaces.
What is the meaning of the "SE" suffix in CM1218-04SE?
The "SE" suffix denotes the SOT-553 package with Pb-free (RoHS-compliant) finish, per onsemi's ordering nomenclature in the datasheet's Table 4 and Ordering Information section. It distinguishes this variant from "SO" (SOT-23-5), "SR" (SOT-143), and "S7" (SC-70-5) versions - all sharing identical electrical specifications but differing in mechanical form factor, thermal performance, and board space requirements.
How many ESD strikes can the CM1218-04SE withstand before performance degradation?
The CM1218-04SE is specified to withstand over 1000 ±15 kV contact discharge ESD events per IEC 61000−4−2 without measurable parameter shift, as stated in the Features section of the datasheet. This endurance is verified under standard test conditions (150 pF/330 Ω network, VN grounded, no external capacitor on CHx) and reflects robust polymer passivation and junction design - critical for manufacturing test fixtures and end-user durability in handheld devices.
CM1218-04SE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
CM1218-04SE FAQ
1.How can I place an order for CM1218-04SE through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1218-04SE 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 CM1218-04SE reliable?
The price and inventory of CM1218-04SE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1218-04SE is usually 5 days.
3.What payment methods are accepted for CM1218-04SE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1218-04SE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1218-04SE?
CM1218-04SE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1218-04SE 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 CM1218-04SE?
For technical support, including CM1218-04SE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1218-04SE requirements.
6.How does Aetrix verify that CM1218-04SE is sourced from the original manufacturer or authorized distributors?
All CM1218-04SE 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 CM1218-04SE meets industry standards.
7.What is the process for return or replacement of CM1218-04SE?
All CM1218-04SE units undergo pre-shipment inspection (PSI). If there is an issue with CM1218-04SE, 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 CM1218-04SE part is unused and in its original packaging.
Return procedure for CM1218-04SE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1218-04SE Tags
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ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
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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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