My Inquiry
My Account
onsemi CM1218-C4SE
- Part No.:
- CM1218-C4SE
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
CM1218-C4SE.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:40,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CM1218-C4SE from onsemi is a low-capacitance transient voltage suppressor array designed for ESD protection of four high-speed I/O lines. It delivers ±15 kV IEC 61000-4-2 contact discharge immunity, 7 pF typical channel capacitance, and 5.5 V reverse stand-off voltage in a 5-pin SOT-553 package-used to safeguard USB, IEEE1394, and serial interface ports.
For engineers reviewing the CM1218-C4SE datasheet, pinout, applications, or equivalent options, key selection criteria include I/O capacitance (7 pF), ESD rating (±15 kV contact), clamp voltage (6.8 V positive / −0.8 V negative), leakage current (≤1 µA at 5 V), and SOT-553 footprint compatibility with space-constrained PCB layouts.
Technical Context
The CM1218-C4SE integrates four independent TVS diodes configured as cathode-to-signal / common-anode architecture, enabling bidirectional clamping per channel. Its low dynamic resistance (0.57 Ω forward, 1.36 Ω reverse) ensures rapid energy diversion during ESD transients.
It operates across −40°C to +85°C and sustains >1000 ESD strikes per pin without degradation. The device is rated for 0.15 W package power dissipation and requires no external capacitors for specified capacitance measurements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Capacitance | 7 pF typical at 2.5 VDC, 1 MHz - enables signal integrity preservation on USB 2.0 and IEEE1394 interfaces |
| Reverse Stand-off Voltage | 5.5 V at IR = 10 µA - sets minimum operating voltage threshold before clamping activation |
| ESD Withstand (IEC 61000-4-2) | ±15 kV contact discharge - meets industrial-grade system-level ESD immunity requirements |
| Clamp Voltage (I = ±10 mA) | +6.8 V / −0.8 V - defines maximum voltage seen by protected IC during transient event |
| Leakage Current | ≤1 µA at VIN = 5.0 VDC - prevents measurable DC loading on data lines |
| Package Power Dissipation | 0.15 W - limits thermal rise under repeated ESD stress in SOT-553 footprint |
Pinout & Package
The CM1218-C4SE is housed in a RoHS-compliant, lead-free 5-lead SOT-553 package (Case 463B), measuring 1.60 × 1.60 × 0.55 mm with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CH1) | Cathode of Channel 1 TVS diode | Connected directly to protected signal line (e.g., USB D+) |
| 2 (VN) | Common anode node | Must be tied to system ground or low-impedance return path |
| 3 (CH2) | Cathode of Channel 2 TVS diode | Connected directly to second protected signal line (e.g., USB D−) |
| 4 (CH3) | Cathode of Channel 3 TVS diode | Connected directly to third protected signal line (e.g., VBUS sense or ID) |
| 5 (CH4) | Cathode of Channel 4 TVS diode | Connected directly to fourth protected signal line (e.g., GND reference or auxiliary control) |
Key Features
| Feature | Design Value |
|---|---|
| Four-channel ESD protection | Independent cathode terminals per channel enable discrete routing for differential pairs and single-ended signals |
| Low 7 pF input capacitance | Minimizes signal distortion and insertion loss on high-speed interfaces up to 480 Mbps (USB 2.0) |
| ±30 kV HBM ESD rating | Exceeds JEDEC JS-001 Class 3B requirement, supporting robust handling during board assembly |
| 1000+ ESD strike endurance | Ensures long-term reliability in field-deployed consumer electronics subject to repeated user contact events |
Applications
| USB 2.0 Port Protection | IEEE1394 (FireWire) Interface |
|---|---|
Use Scenario: Protecting upstream/downstream USB connectors against user-handling ESD in laptops, docking stations, and peripherals. IC Role / Device Role / Timing Role: Bidirectional TVS array clamping transient energy before it reaches USB transceiver IC pins. Use Value: Maintains 480 Mbps data integrity while meeting IEC 61000-4-2 Level 4 immunity without adding series impedance or timing skew. | Use Scenario: Shielding FireWire 400/800 data lanes in digital camcorders and audio interfaces exposed to frequent cable insertion/removal. IC Role / Device Role / Timing Role: Low-capacitance shunt protector placed adjacent to connector to minimize stub length and preserve signal rise/fall times. Use Value: 7 pF capacitance avoids degrading 1.6 Gbps FireWire eye diagram margin; ±15 kV contact rating covers real-world handling conditions. |
| Serial/Parallel Port ESD Guard | Proprietary Docking Interface |
Use Scenario: Adding ESD resilience to legacy RS-232, RS-485, or parallel printer ports in industrial HMIs and medical devices. IC Role / Device Role / Timing Role: Four-channel TVS array protecting TX/RX, RTS/CTS, or data/control lines simultaneously. Use Value: Single-component solution replaces multiple discrete diodes, reducing BOM count and layout area while ensuring uniform clamping behavior. | Use Scenario: Securing custom multi-pin docking connectors used in modular test equipment and enterprise tablets. IC Role / Device Role / Timing Role: Cathode-per-pin configuration allows flexible assignment to power, data, presence detect, and sideband signals within same footprint. Use Value: Enables compact, shielded connector design with guaranteed ±15 kV ESD survival-critical for field-replaceable modules requiring zero-failure insertion cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD4E001DRYR | 4-channel, 5.5 V VRWM, 6.5 pF CI/O, SOT-553 package, ±15 kV IEC 61000-4-2 | Lower capacitance but higher leakage (5 µA); optimized for ultra-low-noise analog sensor interfaces | Prefer when sub-6 pF is mandatory and DC leakage tolerance >1 µA |
| SP1002-04UTG | 4-channel, 5.0 V VRWM, 8.5 pF CI/O, SOT-553, ±12 kV IEC 61000-4-2 | Reduced ESD rating and higher capacitance; lower cost for non-critical consumer applications | Select where ±12 kV suffices and budget constraints outweigh marginal signal integrity gain |
Compared with TPD4E001DRYR and SP1002-04UTG, the CM1218-C4SE provides the optimal balance of 7 pF capacitance, ±15 kV ESD rating, and ≤1 µA leakage-making it preferred for USB 2.0 and IEEE1394 designs where both speed and robustness are required.
Availability
CM1218-C4SE is available at Aetrix Electronics and suitable for USB port hardening, industrial docking interfaces, and high-speed serial link protection requiring stable component supply and long-term lifecycle assurance.
Supply support for CM1218-C4SE 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, and consumer markets.
The CM1218-C4SE belongs to onsemi's transient voltage suppressor portfolio, engineered specifically for low-capacitance, multi-channel ESD protection of high-speed digital interfaces in space-constrained portable and embedded systems.
FAQ
What is the maximum operating temperature range for the CM1218-C4SE?
The CM1218-C4SE is rated for continuous operation from −40°C to +85°C, aligning with industrial-grade environmental requirements. This range is validated per Standard Operating Conditions in the official datasheet and supports deployment in automotive infotainment head units, industrial HMIs, and outdoor-connected devices where ambient temperatures exceed commercial limits.
Does the CM1218-C4SE require external biasing or control signals?
No, the CM1218-C4SE is a passive TVS diode array with no active circuitry, control pins, or bias requirements. It functions solely via intrinsic PN junction behavior: clamping occurs automatically when voltage exceeds the reverse stand-off threshold (5.5 V). No external components or power rails are needed for CM1218-C4SE operation.
How many ESD strikes can the CM1218-C4SE withstand before performance degradation?
The CM1218-C4SE is characterized to survive over 1000 ESD strikes per I/O pin under IEC 61000-4-2 contact discharge conditions (±15 kV), with no measurable shift in leakage current, capacitance, or clamp voltage. This endurance is confirmed in the "Features" section of the datasheet and applies to all four channels independently.
Is the CM1218-C4SE compatible with lead-free reflow soldering processes?
Yes, the CM1218-C4SE is supplied in a RoHS-compliant, lead-free SOT-553 package and qualified for standard Pb-free reflow profiles per J-STD-020. Its maximum package power dissipation (0.15 W) and thermal mass are compatible with peak reflow temperatures up to 260°C, and the device carries the "SE" suffix denoting Pb-free finish per onsemi's packaging nomenclature.
Can the CM1218-C4SE protect differential signal pairs like USB D+/D− without skewing signal timing?
Yes-the CM1218-C4SE's matched 7 pF typical capacitance across CH1 and CH3 (assigned to D+ and D−) ensures balanced loading, preserving differential impedance and minimizing timing skew. Its low dynamic resistance (0.57 Ω forward) also guarantees symmetrical clamping response, maintaining USB 2.0 eye diagram compliance per USB-IF test specifications when implemented with proper layout practices.
CM1218-C4SE 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-C4SE FAQ
1.How can I place an order for CM1218-C4SE through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1218-C4SE 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-C4SE reliable?
The price and inventory of CM1218-C4SE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1218-C4SE is usually 5 days.
3.What payment methods are accepted for CM1218-C4SE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1218-C4SE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1218-C4SE?
CM1218-C4SE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1218-C4SE 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-C4SE?
For technical support, including CM1218-C4SE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1218-C4SE requirements.
6.How does Aetrix verify that CM1218-C4SE is sourced from the original manufacturer or authorized distributors?
All CM1218-C4SE 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-C4SE meets industry standards.
7.What is the process for return or replacement of CM1218-C4SE?
All CM1218-C4SE units undergo pre-shipment inspection (PSI). If there is an issue with CM1218-C4SE, 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-C4SE part is unused and in its original packaging.
Return procedure for CM1218-C4SE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1218-C4SE 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
