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onsemi CM1224-04SO
- Part No.:
- CM1224-04SO
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOT-23-6
- Datasheet:
-
CM1224-04SO.pdf
- Description:
- TVS DIODE 3.3VWM 10VC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:262,728
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Product details
Overview
CM1224-04SO from onsemi is a 4-channel low-capacitance ESD protection array designed for high-speed data lines, featuring 0.7 pF typical channel input capacitance, ±8 kV IEC 61000−4−2 contact discharge rating, and integrated VP–VN Zener clamping to eliminate external bypass capacitors. It protects USB 2.0, HDMI, and Serial ATA interfaces in notebooks, digital TVs, and storage devices.
For engineers reviewing the CM1224-04SO datasheet, pinout, applications, or equivalent options, key selection criteria include channel count (4), ultra-low capacitance matching (0.02 pF typical), clamping voltage (±10 V / −1.8 V), dynamic resistance (1.08 Ω / 0.66 Ω), and SOT23-6 package compatibility with high-density PCB layouts.
Technical Context
The CM1224-04SO implements a dual-diode steering architecture per channel-each I/O pin connects via series diodes to VP (positive rail) and VN (ground rail)-enabling bidirectional ESD current diversion. Its embedded Zener diode between VP and VN actively clamps supply rail transients and suppresses inductive overshoot during fast-rising ESD events (e.g., 30 A in 1 ns).
It operates across –40°C to +85°C with 3.3 V or 5.5 V supply rails, delivers ≤±1.0 µA leakage at 5 V, and maintains stable 0.6–0.8 V forward voltage across diodes at 8 mA. Channel capacitance remains tightly matched (0.02 pF typical) and temperature/voltage invariant-critical for differential signal integrity in HDMI and USB 2.0 applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating | ±8 kV contact discharge per IEC 61000−4−2 Level 4 - ensures robust system-level ESD immunity without external TVS stacking. |
| Channel Input Capacitance | 0.7 pF typical at 1 MHz - preserves signal integrity up to 480 Mbps (USB 2.0) and 1.65 Gbps (HDMI 1.3) with minimal insertion loss. |
| Capacitance Matching | 0.02 pF typical - enables precise differential pair protection without skew-induced jitter in high-speed serial links. |
| Clamp Voltage (VCL) | +10 V / −1.8 V at 1 A (8/20 µs) - limits transient overvoltage seen by downstream PHY ICs during ESD strikes. |
| Dynamic Resistance (RDYN) | 1.08 Ω (positive) / 0.66 Ω (negative) - reduces voltage overshoot under fast ESD pulses by minimizing I×R drop across protection path. |
| Supply Voltage Range | 3.3 V to 5.5 V (VP–VN) - supports both 3.3 V logic domains and 5 V legacy interfaces without level-shifting. |
| Leakage Current | ±1.0 µA max at 25°C - prevents DC loading of sensitive analog or high-impedance data lines. |
Pinout & Package
SOT23-6 package (Case 527AJ), 2.90 mm × 2.80 mm × 1.45 mm body, lead-free, RoHS compliant. Designed for reflow soldering with standard SOT23 footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CH1 | I/O channel 1 - bidirectionally protected signal line connected to external connector or PHY interface. |
| 2 | VN | Negative supply rail (GND) - return path for negative ESD current and reference for Zener clamp operation. |
| 3 | CH2 | I/O channel 2 - second protected signal line, electrically isolated but capacitively matched to CH1 for differential use. |
| 4 | CH3 | I/O channel 3 - third protected line, enabling full DVI/HDMI TMDS lane protection (3 data + 1 clock) with one device. |
| 5 | VP | Positive supply rail (PWR) - provides clamping reference for positive ESD transients and powers internal Zener structure. |
| 6 | CH4 | I/O channel 4 - fourth protected line, supporting 4-lane interfaces like PCIe Gen1 or quad-SATA lanes. |
Key Features
| Feature | Design Value |
|---|---|
| Zener-supplied rail clamping | Eliminates need for external 0.22 µF VP-to-GND capacitor - reduces BOM count and PCB area in space-constrained designs. |
| 0.02 pF capacitance matching | Ensures <1 ps inter-channel skew in differential pairs - critical for HDMI 1.3+ and USB 2.0 eye diagram compliance. |
| Low 0.7 pF input capacitance | Minimizes high-frequency attenuation - maintains >15 dB insertion loss margin at 500 MHz for USB 2.0 full-speed signals. |
| 1000+ ESD strike endurance | Guarantees long-term reliability in production test environments and field-replaceable ports subject to repeated handling. |
| Lead-free SOT23-6 packaging | Enables automated pick-and-place assembly and meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1). |
Applications
| USB 2.0 Interface Protection | HDMI/DVI TMDS Lane Protection |
|---|---|
Use Scenario: Protecting D+ and D− data lines on USB 2.0 host/device ports in notebooks and docking stations. IC Role / Device Role / Timing Role: Bidirectional ESD shunt placed between connector and USB transceiver PHY, operating transparently during 480 Mbps signaling. Use Value: Prevents latch-up or gate oxide damage in USB PHY ICs while adding <0.1 dB insertion loss at 240 MHz fundamental frequency. |
Use Scenario: Shielding three TMDS data channels and one TMDS clock channel in HDMI source devices (e.g., set-top boxes, GPUs). IC Role / Device Role / Timing Role: Per-lane ESD clamp with matched capacitance preserving differential impedance (100 Ω) and common-mode rejection. Use Value: Maintains HDMI 1.3 compliance (eye height >40% at 74.25 MHz pixel clock) without requiring layout detuning or compensation. |
| Serial ATA Data Line Protection | PCI Express Gen1 Lane Protection |
Use Scenario: Safeguarding SATA I (1.5 Gbps) transmitter/receiver lanes in HDD enclosures and motherboard southbridge interfaces. IC Role / Device Role / Timing Role: Low-capacitance ESD barrier placed immediately after SATA connector, before AC coupling capacitors. Use Value: Adds <0.05 UI jitter at 1.5 GHz while delivering ±8 kV system-level ESD immunity per IEC 61000−4−2. |
Use Scenario: Protecting individual PCIe Gen1 (2.5 Gbps) lanes in add-in cards and server backplanes exposed to handling ESD. IC Role / Device Role / Timing Role: Point-of-entry ESD suppression on each differential pair, leveraging matched capacitance to avoid skew-induced bit errors. Use Value: Enables PCIe compliance testing pass at 2.5 GT/s with no BER degradation due to protection-induced intersymbol interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR (Texas Instruments) | 2-channel, 0.8 pF typical capacitance, ±8 kV ESD, SOT-5X3 package (1.6 mm × 1.6 mm). | Limited to dual-lane interfaces (e.g., USB only); lacks 4-channel integration for HDMI/TMDS or SATA x4. | Select when board space is constrained and only two high-speed lines require protection. |
| SP3203-04UTG (Littelfuse) | 4-channel, 0.5 pF typical capacitance, ±15 kV air/±8 kV contact, SOT23-6 package, higher clamp voltage (+12 V / −3 V). | Better ESD margin but higher VCL risks PHY damage in 3.3 V systems; tighter capacitance benefits ultra-high-speed (>3 Gbps) links. | Select for enhanced ESD robustness in industrial connectors where 3.3 V PHY tolerance allows +12 V clamping. |
Compared with TPD2E001DRYR, CM1224-04SO offers 4-channel integration and superior capacitance matching for multi-lane interfaces; compared with SP3203-04UTG, it delivers lower clamping voltage for safer 3.3 V PHY protection despite slightly higher capacitance.
Availability
CM1224-04SO is available at Aetrix Electronics and suitable for USB 2.0, HDMI, and Serial ATA applications requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle support for consumer electronics and industrial embedded platforms.
Supply support for CM1224-04SO 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, sensor, and ESD protection solutions for automotive, industrial, and computing markets.
The CM1224 family was engineered specifically for high-speed serial interface protection-balancing ultra-low capacitance, tight matching, and integrated rail clamping to replace discrete diode+capacitor ESD solutions in USB, HDMI, and SATA designs.
FAQ
What is the maximum operating voltage for CM1224-04SO?
The CM1224-04SO supports an operating supply voltage (VP − VN) of up to 6.0 V absolute maximum, with standard operation specified at 3.3 V or 5.5 V. Its electrical characteristics-including leakage current (±1.0 µA max), forward voltage (0.6–0.95 V), and clamping behavior-are validated across –40°C to +85°C at these nominal rails. Exceeding 6.0 V may cause permanent damage per Absolute Maximum Ratings.
Does CM1224-04SO require an external bypass capacitor on the VP pin?
No-CM1224-04SO integrates a Zener diode between VP and VN that clamps supply rail transients and eliminates the need for an external 0.22 µF bypass capacitor. This reduces BOM cost and PCB area. However, for lowest possible clamping voltage-especially when VP is biased significantly below the Zener breakdown-the datasheet recommends adding a 0.22 µF ceramic capacitor between VP and ground.
How many ESD strikes can CM1224-04SO withstand before degradation?
Each I/O pin of the CM1224-04SO is rated to withstand over 1000 ESD strikes at ±8 kV (IEC 61000−4−2 contact discharge) without performance degradation. This endurance is verified through accelerated life testing and ensures long-term reliability in production test fixtures and field-replaceable ports subjected to repeated human-handling events.
Is CM1224-04SO compatible with lead-free reflow soldering processes?
Yes-CM1224-04SO uses lead-free finishing and is qualified for standard Pb-free reflow profiles per JEDEC J-STD-020. Its SOT23-6 package (Case 527AJ) has a moisture sensitivity level (MSL) of 1, meaning it can be stored indefinitely at ≤30°C/60% RH without baking. Peak reflow temperature must not exceed 260°C for ≤30 seconds.
What is the significance of 0.02 pF channel capacitance matching in CM1224-04SO?
The 0.02 pF typical capacitance matching between channels in CM1224-04SO minimizes inter-pair skew in differential signaling (e.g., HDMI TMDS, USB D+/D−). This tight matching ensures <1 ps timing mismatch at 500 MHz, preserving eye diagram integrity and preventing jitter-induced bit errors-critical for maintaining HDMI 1.3 or USB 2.0 compliance without post-layout tuning.
CM1224-04SO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SOT-23-6
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 3.3V
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 10V (Typ)
- Current - Peak Pulse (10/1000µs):
- 1A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- Yes
- Applications:
- HDMI
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
CM1224-04SO FAQ
1.How can I place an order for CM1224-04SO through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1224-04SO 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 CM1224-04SO reliable?
The price and inventory of CM1224-04SO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1224-04SO is usually 5 days.
3.What payment methods are accepted for CM1224-04SO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1224-04SO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1224-04SO?
CM1224-04SO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1224-04SO 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 CM1224-04SO?
For technical support, including CM1224-04SO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1224-04SO requirements.
6.How does Aetrix verify that CM1224-04SO is sourced from the original manufacturer or authorized distributors?
All CM1224-04SO 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 CM1224-04SO meets industry standards.
7.What is the process for return or replacement of CM1224-04SO?
All CM1224-04SO units undergo pre-shipment inspection (PSI). If there is an issue with CM1224-04SO, 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 CM1224-04SO part is unused and in its original packaging.
Return procedure for CM1224-04SO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1224-04SO 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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