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onsemi CM1218-02SO
- Part No.:
- CM1218-02SO
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
CM1218-02SO.pdf
- Description:
- LOW CAPACITANCE TRANSIENT VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:6,583
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Product details
Overview
CM1218-02SO from onsemi is a two-channel transient voltage suppressor (TVS) array designed for ESD protection of high-speed I/O lines. It features ±15 kV IEC 61000−4−2 contact discharge rating, 7 pF typical channel input capacitance, and 5.5 V reverse stand-off voltage - enabling robust protection without signal integrity degradation in USB 2.0 and serial interface applications.
For engineers reviewing the CM1218-02SO datasheet, pinout, applications, or equivalent options, key selection criteria include low capacitance for high-speed data lines, verified ±30 kV HBM ESD tolerance, dual-channel configuration with common anode topology, and SOT-23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The CM1218-02SO integrates two bidirectional TVS diodes sharing a common anode (VN), forming a dual-rail clamp architecture optimized for differential or independent I/O line protection. Its low 7 pF capacitance ensures minimal loading on 480 Mbps USB 2.0 signals and other high-frequency interfaces.
Each channel delivers precise clamping at 6.8 V (positive) and −0.8 V (negative) under 10 mA transient current, with leakage current ≤1 µA at 5.0 VDC. The device operates across −40°C to +85°C and is rated for ≥1000 ESD strikes per pin without performance degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 2 independent ESD protection channels with shared anode (VN) |
| ESD Rating (IEC 61000−4−2) | ±15 kV contact discharge - meets industrial and consumer immunity requirements |
| ESD Rating (HBM) | ±30 kV - exceeds JEDEC JS-001 Class 3A (≥8 kV) by >3× |
| Input Capacitance | 7 pF typical at 2.5 VDC/1 MHz - preserves signal integrity up to 480 Mbps USB 2.0 |
| Reverse Stand-off Voltage | 5.5 V at IR = 10 µA - ensures no conduction during normal 5 V bus operation |
| Clamp Voltage (I = ±10 mA) | +6.8 V / −0.8 V - limits transients below IC absolute maximum ratings |
| Leakage Current | ≤1 µA at 5.0 VDC - avoids DC loading on sensitive I/O pins |
Pinout & Package
SOT-23-3 package (Case 419AH), 2.92 × 2.37 × 1.01 mm, Pb-free, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CH1) | Cathode of Channel 1 TVS diode | Connects to protected I/O line 1; clamps positive/negative transients to VN rail |
| 2 (VN) | Common anode node | Must be tied to system ground or local reference plane; serves both channels |
| 3 (CH2) | Cathode of Channel 2 TVS diode | Connects to protected I/O line 2; enables independent dual-line protection |
Key Features
| Feature | Design Value |
|---|---|
| Low I/O capacitance | 7 pF typical - maintains rise/fall time integrity for USB 2.0, UART, and SPI signals |
| Dual-channel integration | Two TVS diodes in single SOT-23-3 footprint - reduces board area vs. discrete diodes |
| High ESD endurance | ≥1000 IEC 61000−4−2 strikes per pin - supports long-term field reliability |
| Pb-free construction | RoHS-compliant, lead-free termination - meets global environmental compliance mandates |
| Compact SMT package | SOT-23-3 (2.92 × 2.37 mm) - fits tight pitch layouts near connectors and ports |
Applications
| USB 2.0 Interface Protection | Serial Communication Port Protection |
|---|---|
Use Scenario: Protecting D+ and D− lines of a USB 2.0 upstream/downstream port against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Dual-channel TVS array providing symmetric clamping on differential pair while maintaining <7 pF loading. Use Value: Prevents latch-up or damage to USB transceivers without degrading 480 Mbps eye diagram margin. |
Use Scenario: Safeguarding RS-232 or UART TX/RX pins exposed on external headers or docking connectors. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor placed directly at connector entry point before level-shifting circuitry. Use Value: Enables reliable operation in industrial environments where ±15 kV contact ESD is routine. |
| Consumer Audio/Video Port Protection | Embedded System Debug Interface Protection |
Use Scenario: Shielding HDMI CEC, SPDIF, or proprietary audio sync lines in smart TVs and streaming devices. IC Role / Device Role / Timing Role: Two-channel ESD protector with sub-10 pF capacitance preserving signal fidelity on low-voltage digital control lines. Use Value: Eliminates intermittent resets caused by ESD-induced glitches on timing-critical control buses. |
Use Scenario: Hardening SWD/JTAG debug pins (SWCLK, SWDIO) on microcontroller evaluation boards and production modules. IC Role / Device Role / Timing Role: Compact dual-rail clamp preventing ESD-induced programming failure during lab or field firmware updates. Use Value: Ensures debug interface remains functional after repeated handling and probe contact in development labs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRSR | Single-channel, 0.85 pF capacitance, lower 5.5 V clamp voltage, SC-70-3 package | Better suited for ultra-high-speed (>1 Gbps) lines but requires two devices for dual-channel use | Select when minimizing capacitance is critical and board area allows dual placement |
| ESD5Z3.3T5G | Single-channel, 3.3 V stand-off, 12 pF capacitance, SOD-523 package | Higher capacitance limits use to <100 Mbps interfaces; lower stand-off suits 3.3 V logic only | Choose for cost-sensitive 3.3 V systems where speed is secondary to BOM simplicity |
Compared with TPD2E001DRSR and ESD5Z3.3T5G, the CM1218-02SO uniquely delivers dual-channel protection in one SOT-23-3 package with balanced 5.5 V stand-off and 7 pF capacitance - making it optimal for space-constrained USB 2.0 and mixed-voltage serial port designs where layout efficiency and interoperability matter.
Availability
CM1218-02SO is available at Aetrix Electronics and suitable for USB 2.0 interface protection, serial communication port hardening, and consumer audio/video port safeguarding requiring stable component supply and RoHS-compliant sourcing.
Supply support for CM1218-02SO 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 connectivity solutions for automotive, industrial, cloud, and consumer markets.
The CM1218-02SO belongs to onsemi's low-capacitance TVS diode family, engineered specifically for high-speed data line ESD protection in portable and interface-dense electronics.
FAQ
What is the exact pin configuration of the CM1218-02SO?
The CM1218-02SO uses a 3-pin SOT-23-3 package with pin 1 = CH1 cathode, pin 2 = VN (common anode), and pin 3 = CH2 cathode. This configuration enables dual independent I/O protection paths referenced to a shared ground node, confirmed in the official onsemi package drawing CASE 419AH.
Does the CM1218-02SO support bidirectional ESD clamping?
Yes, the CM1218-02SO provides bidirectional clamping on both CH1 and CH2 channels. Each cathode-anode junction conducts during positive transients (clamping to VN), while the forward-biased path handles negative transients (clamping to ~−0.8 V), as specified in Table 3 of the CM1218 datasheet.
Can the CM1218-02SO be used on 3.3 V logic lines?
Yes, the CM1218-02SO is compatible with 3.3 V systems. Its 5.5 V reverse stand-off voltage ensures no conduction during normal operation, and its ±15 kV IEC 61000−4−2 rating protects against ESD events regardless of nominal rail voltage - validated across −40°C to +85°C operating range.
How does the CM1218-02SO compare to discrete TVS diodes in layout efficiency?
The CM1218-02SO replaces two discrete low-capacitance TVS diodes with a single SOT-23-3 footprint, reducing PCB area by ~40% and eliminating routing complexity between separate devices. Its integrated common-anode structure also minimizes ground loop inductance versus discrete solutions.
Is the CM1218-02SO compliant with RoHS and REACH regulations?
Yes, the CM1218-02SO is explicitly marked as Pb-free in the ordering information and conforms to RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, as confirmed in the "ORDERING INFORMATION" section and mechanical drawings of the CM1218 datasheet.
CM1218-02SO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 6.1V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- 6.8V (Typ)
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 7pF @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
CM1218-02SO FAQ
1.How can I place an order for CM1218-02SO through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1218-02SO 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 CM1218-02SO reliable?
The price and inventory of CM1218-02SO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1218-02SO is usually 5 days.
3.What payment methods are accepted for CM1218-02SO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1218-02SO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1218-02SO?
CM1218-02SO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1218-02SO 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 CM1218-02SO?
For technical support, including CM1218-02SO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1218-02SO requirements.
6.How does Aetrix verify that CM1218-02SO is sourced from the original manufacturer or authorized distributors?
All CM1218-02SO 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 CM1218-02SO meets industry standards.
7.What is the process for return or replacement of CM1218-02SO?
All CM1218-02SO units undergo pre-shipment inspection (PSI). If there is an issue with CM1218-02SO, 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 CM1218-02SO part is unused and in its original packaging.
Return procedure for CM1218-02SO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1218-02SO Tags
-
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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