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onsemi CM1218-02S7
- Part No.:
- CM1218-02S7
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
CM1218-02S7.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:24,000
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Product details
Overview
CM1218-02S7 from onsemi is a two-channel low-capacitance transient voltage suppressor (TVS) array designed for ESD protection of high-speed I/O 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 data line protection in portable consumer electronics.
For engineers reviewing the CM1218-02S7 datasheet, pinout, applications, or equivalent options, key selection criteria include low signal-line capacitance, guaranteed ±30 kV HBM ESD robustness, SC70-3 package footprint compatibility, and verified clamping performance at ±10 mA.
Technical Context
The CM1218-02S7 implements dual unidirectional TVS diodes with a common anode configuration, enabling bidirectional ESD protection per channel using a single shared VN terminal. Its low 7 pF capacitance is achieved via optimized junction design and minimal parasitic layout, preserving signal integrity up to 480 Mbps in USB 2.0 applications.
Each channel operates with a 5.5 V reverse stand-off voltage and clamps to +6.8 V / −0.8 V at ±10 mA, ensuring safe voltage limiting during transients while maintaining compatibility with 5 V logic systems. The device meets MIL-STD-883H Method 3015 (±30 kV HBM) and IEC 61000−4−2 Level 4 (±15 kV contact), with leakage current ≤1 µA at 5.0 VDC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 2 independent ESD protection channels in common-anode configuration |
| Input Capacitance | 7 pF typical per channel - preserves USB 2.0 signal rise/fall times and minimizes bit error rate |
| Reverse Stand-off Voltage | 5.5 V - ensures no conduction during normal 5 V operation, preventing false triggering |
| ESD Withstand (IEC 61000−4−2) | ±15 kV contact discharge - exceeds industrial immunity requirements for handheld interfaces |
| HBM ESD Rating | ±30 kV - provides robust handling protection during board assembly and end-user handling |
| Clamp Voltage (±10 mA) | +6.8 V / −0.8 V - limits transient overvoltage to safe levels for downstream 5 V tolerant ICs |
| Leakage Current | ≤1 µA at 5.0 VDC - avoids loading of high-impedance signal paths or battery-powered circuits |
Pinout & Package
CM1218-02S7 is housed in a Pb-free SC-70-3 (CASE 419AB) surface-mount package measuring 2.05 × 1.25 × 0.95 mm, optimized for space-constrained USB port layouts and automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode of Channel 1 (CH1) | Connected to protected I/O line 1 (e.g., USB D+); conducts during positive transients |
| 2 | Anode (VN) | Common reference node tied to system ground; completes conduction path for both channels |
| 3 | Cathode of Channel 2 (CH2) | Connected to protected I/O line 2 (e.g., USB D−); conducts during positive transients |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel ESD protection | Enables simultaneous safeguarding of differential pairs (e.g., USB D+/D−) with one compact device |
| 7 pF typical I/O capacitance | Maintains signal integrity in high-speed digital interfaces without degrading eye diagram margins |
| ±15 kV IEC 61000−4−2 compliance | Meets highest international ESD immunity standard for consumer product certification |
| SC-70-3 footprint | Reduces PCB area by >30% vs. SOT-23-3 while supporting same reflow profiles and pick-and-place tooling |
| ≥1000 ESD strike endurance | Ensures long-term reliability across repeated electrostatic events in field-deployed devices |
Applications
| USB 2.0 Data Lines | Mobile Device Charging Ports |
|---|---|
Use Scenario: Protecting D+ and D− lines of USB 2.0 ports in smartphones, tablets, and accessories against user-handling ESD. IC Role / Device Role / Timing Role: Bidirectional transient voltage clamp placed directly at connector entry point to shunt ESD energy to ground before reaching PHY IC. Use Value: Prevents latch-up or damage to USB transceivers while maintaining <100 ps response time and <7 pF loading. | Use Scenario: Safeguarding power delivery and data pins in micro-USB or USB-C receptacles exposed to frequent plugging/unplugging. IC Role / Device Role / Timing Role: Low-capacitance ESD suppressor co-located with connector to minimize trace inductance and maximize clamping efficiency. Use Value: Enables compliance with IEC 61000−4−2 Level 4 without compromising charging speed or data throughput. |
| High-Speed Serial Interfaces | Industrial Control Panel I/O |
Use Scenario: Shielding UART, SPI, or I²C lines in wearables and IoT edge nodes where board space and ESD risk are critical. IC Role / Device Role / Timing Role: Two-channel TVS array protecting complementary signal pairs with matched capacitance and clamping behavior. Use Value: Eliminates need for discrete diodes per line, reducing BOM count and layout complexity while ensuring balanced signal propagation. | Use Scenario: Hardening front-panel buttons, LED indicators, or sensor inputs on factory HMIs subject to operator touch-induced discharges. IC Role / Device Role / Timing Role: Robust ESD guard for low-voltage DC I/O lines operating in harsh electromagnetic environments. Use Value: Guarantees ≥1000 strike endurance and <1 µA leakage-critical for battery-backed or low-power monitoring circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR | Single-channel, 10 pF typical capacitance, 5.5 V stand-off, SC-70-3 package | Requires two devices for differential pair protection; higher capacitance may affect USB 2.0 timing margins | Select when only one line needs protection or when slightly higher capacitance is acceptable for cost-sensitive designs |
| ESD5Z3.3T5G | Single-channel, 3.3 V stand-off, 12 pF capacitance, SOD-523 package | Lower stand-off voltage limits use to 3.3 V systems; larger package increases board area vs. SC-70-3 | Prefer for 3.3 V logic interfaces where tighter voltage clamping is required, but not for 5 V USB applications |
Compared with TPD2E001DRYR and ESD5Z3.3T5G, the CM1218-02S7 uniquely integrates dual-channel protection in a single SC-70-3 footprint with 7 pF capacitance and 5.5 V stand-off-making it the optimal choice for space-constrained, 5 V high-speed differential interface protection where board real estate and signal fidelity are prioritized.
Availability
CM1218-02S7 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, mobile device port hardening, and industrial control panel I/O requiring stable component supply and consistent Pb-free manufacturing.
Supply support for CM1218-02S7 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The CM1218 family was developed specifically for ultra-low-capacitance ESD protection of high-speed serial interfaces, targeting design needs in portable consumer electronics where signal integrity and miniaturization are paramount.
FAQ
What is the primary function of the CM1218-02S7 in circuit protection?
The CM1218-02S7 functions as a dual-channel transient voltage suppressor that provides bidirectional ESD protection for high-speed I/O lines. It clamps voltage spikes to safe levels-+6.8 V and −0.8 V at ±10 mA-while maintaining only 7 pF typical capacitance per channel. This enables reliable protection of USB 2.0, UART, and other differential interfaces without signal degradation. Each CM1218-02S7 unit safeguards two signal lines using a shared anode (VN) architecture.
Does the CM1218-02S7 meet international ESD immunity standards?
Yes, the CM1218-02S7 is rated for ±15 kV contact discharge per IEC 61000−4−2 and ±30 kV per MIL-STD-883H Method 3015 (HBM). These ratings are verified across all pins under standardized test conditions with VN grounded and no external capacitors on CHx lines. Compliance is documented in the official CM1218/D datasheet Rev. 4, confirming its suitability for CE, FCC, and other regulatory-marketed consumer electronics requiring Level 4 ESD immunity.
Can the CM1218-02S7 be used for USB 3.0 or higher-speed interfaces?
No, the CM1218-02S7 is not recommended for USB 3.0 or faster interfaces. Its 7 pF typical capacitance-while excellent for USB 2.0 (480 Mbps)-introduces excessive insertion loss and return loss at SuperSpeed frequencies (>5 Gbps). USB 3.0+ designs require sub-0.5 pF solutions such as specialized high-frequency TVS arrays or integrated ESD structures within the PHY. The CM1218-02S7 datasheet explicitly positions it for "high-speed consumer electronic ports" including USB 2.0, not Gen 2/3 protocols.
What is the thermal and power handling capability of the CM1218-02S7?
The CM1218-02S7 has a package power dissipation rating of 0.2 W in the SC-70-3 package (CASE 419AB), validated across −40°C to +85°C operating temperature. This supports transient energy absorption from ESD events without thermal runaway, given its short pulse duration (<100 ns) and low duty cycle. Continuous power dissipation is not applicable, as the device operates in clamping mode only during transients; steady-state leakage remains ≤1 µA at 5.0 VDC, minimizing self-heating in the CM1218-02S7.
How does the pin configuration of the CM1218-02S7 differ from other variants like CM1218-04S7?
The CM1218-02S7 uses a 3-pin SC-70-3 configuration: Pin 1 = CH1 cathode, Pin 2 = common anode (VN), Pin 3 = CH2 cathode. In contrast, CM1218-04S7 is a 5-pin SC-70-5 device supporting four channels with separate cathodes and shared VN. The CM1218-02S7's 3-pin layout simplifies routing for differential pairs but cannot protect more than two lines. This structural difference is defined in the "PACKAGE / PINOUT DIAGRAMS" section of the CM1218/D datasheet and confirmed by the marking diagram and mechanical drawings.
CM1218-02S7 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:
- -
CM1218-02S7 FAQ
1.How can I place an order for CM1218-02S7 through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1218-02S7 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 CM1218-02S7 reliable?
The price and inventory of CM1218-02S7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1218-02S7 is usually 5 days.
3.What payment methods are accepted for CM1218-02S7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1218-02S7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1218-02S7?
CM1218-02S7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1218-02S7 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 CM1218-02S7?
For technical support, including CM1218-02S7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1218-02S7 requirements.
6.How does Aetrix verify that CM1218-02S7 is sourced from the original manufacturer or authorized distributors?
All CM1218-02S7 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 CM1218-02S7 meets industry standards.
7.What is the process for return or replacement of CM1218-02S7?
All CM1218-02S7 units undergo pre-shipment inspection (PSI). If there is an issue with CM1218-02S7, 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 CM1218-02S7 part is unused and in its original packaging.
Return procedure for CM1218-02S7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1218-02S7 Tags
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ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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