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onsemi CM1224-02SR
- Part No.:
- CM1224-02SR
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
CM1224-02SR.pdf
- Description:
- TVS DIODE 3.3VWM 10VC SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,734
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Product details
Overview
CM1224-02SR from onsemi is a 2-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 10 V clamping voltage under 1 A transient current. It protects USB 2.0, IEEE1394, and DVI/HDMI interfaces by steering ESD current to VP/VN rails via dual-diode architecture with integrated Zener clamp.
For engineers reviewing the CM1224-02SR datasheet, pinout, applications, or equivalent options, this device is selected for high-speed port protection where sub-1 pF loading, differential signal integrity, and supply-rail self-protection without external bypass capacitors are critical design requirements.
Technical Context
The CM1224-02SR implements a dual-diode + Zener topology per channel: two series diodes steer positive/negative ESD transients to VP (3.3–5.5 V) or VN (GND), while an embedded Zener between VP and VN clamps supply rail surges and eliminates need for external decoupling. Its 0.02 pF typical capacitance matching enables precise differential pair protection.
It operates across –40°C to +85°C, supports 6 V max VP–VN differential, and delivers 1.08 Ω dynamic resistance during positive transients-critical for minimizing voltage overshoot at 1 A, 8/20 µs pulses. No external capacitor is required on VP due to internal Zener regulation, reducing BOM count and PCB area.
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 cascading. |
| Channel Input Capacitance | 0.7 pF typical at 1 MHz - preserves signal integrity up to 480 Mbps (USB 2.0) with negligible insertion loss. |
| Clamp Voltage (VCL) | +10 V at 1 A, 8/20 µs - limits protected line voltage to safe levels during fast-rising ESD events. |
| Dynamic Resistance (RDYN) | 1.08 Ω for positive transients - reduces voltage overshoot (ΔV = R × di/dt) in high-dI/dt scenarios. |
| Capacitance Matching | 0.02 pF typical - maintains common-mode rejection and timing skew < 0.5 ps in differential pairs like USB D+/D−. |
| Supply Voltage Range | VP − VN = 3.3 V to 5.5 V - compatible with standard logic I/O domains including 3.3 V and 5 V systems. |
| Leakage Current | ±1.0 µA max at 5 V - prevents DC loading or bias shift in sensitive analog or high-impedance signal paths. |
Pinout & Package
SOT143−4 package (Case 318A), 2.92 mm × 2.37 mm × 1.01 mm body, lead-free, RoHS compliant. Four-terminal configuration optimized for minimal trace inductance in high-speed layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VN | GND reference rail | Return path for negative ESD current; must be connected to low-inductance ground plane near connector entry point. |
| 2 - CH1 | I/O protection channel | Protected signal line (e.g., USB D+); bidirectional clamping to VP/VN via internal diode stack. |
| 3 - CH2 | I/O protection channel | Second protected signal line (e.g., USB D−); matched capacitance ensures differential signal fidelity. |
| 4 - VP | Positive supply rail | Clamped by internal Zener; no external bypass capacitor needed - simplifies layout and reduces component count. |
Key Features
| Feature | Design Value |
|---|---|
| Zener-integrated supply rail protection | Eliminates need for external 0.22 µF VP-to-GND capacitor - reduces PCB footprint and BOM cost. |
| 0.02 pF capacitance matching | Enables use in differential high-speed interfaces (USB 2.0, FireWire) without skew-induced jitter or eye closure. |
| Low 0.7 pF channel capacitance | Maintains >20 dB insertion loss margin at 240 MHz (USB 2.0 fundamental), preserving signal rise time. |
| 1000+ ESD strike endurance | Ensures long-term reliability in field-deployed devices subject to repeated handling and connector mating cycles. |
| Lead-free SOT143−4 package | Compatible with standard reflow profiles; 2.92 mm × 2.37 mm footprint fits tight spacing around USB connectors. |
Applications
| USB 2.0 Interface Protection | IEEE1394 (FireWire) Port Protection |
|---|---|
|
Use Scenario: Protecting D+/D− lines of USB 2.0 ports in notebooks and docking stations against human-body-model ESD events during cable insertion. IC Role / Device Role / Timing Role: Bidirectional ESD clamp placed within 3 mm of USB connector, routing transients to VP/VN rails while preserving 480 Mbps eye diagram integrity. Use Value: 0.7 pF capacitance and 0.02 pF matching prevent differential skew >0.3 ps, maintaining USB 2.0 compliance without signal conditioning. |
Use Scenario: Safeguarding 400/800 Mbps IEEE1394 data lanes in digital camcorders and external storage enclosures exposed to frequent hot-plug events. IC Role / Device Role / Timing Role: Dual-channel transient suppressor mounted adjacent to FireWire connector, clamping ±8 kV strikes before reaching PHY IC inputs. Use Value: Integrated Zener eliminates need for separate VP decoupling, enabling compact 2-layer PCB layout in space-constrained camcorder flex assemblies. |
| HDMI/DVI Data Lane Protection | Serial ATA (SATA) Interface Protection |
|
Use Scenario: Shielding TMDS clock/data channels in LCD monitors and set-top boxes from ESD induced during HDMI cable mating or EMI coupling. IC Role / Device Role / Timing Role: Low-capacitance array applied per differential pair (CLK+/CLK−, DATA0+/DATA0−), minimizing added jitter and insertion loss. Use Value: 10 V clamp voltage ensures protected lines stay below 1.2 V logic threshold during transients, preventing false edge detection in receiver circuits. |
Use Scenario: Securing SATA TX/RX differential pairs in desktop PCs and HDD enclosures against electrostatic discharge during drive replacement or board servicing. IC Role / Device Role / Timing Role: Two-channel protector deployed at SATA connector, shunting ESD energy away from SerDes PHY while maintaining 1.5–3 Gbps signal fidelity. Use Value: 1.08 Ω dynamic resistance limits peak overshoot to <12 V at 30 A/ns dI/dt - critical for avoiding PHY latch-up in Gen I/II SATA links. |
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) | Single-channel, 0.5 pF capacitance, ±8 kV rating, but no integrated Zener - requires external VP bypass capacitor. | Requires additional 0.1 µF ceramic capacitor on VP rail; less suitable for ultra-compact layouts where board space is constrained. | Select when lowest possible capacitance (<0.5 pF) is prioritized over BOM simplification and supply-rail autonomy. |
| ESD5Z3.3T5G (onsemi) | Single-channel Zener-based TVS, 3.3 V standoff, 12 V clamp, 15 pF capacitance - higher loading, no VP/VN rail steering architecture. | Not suitable for differential high-speed lines due to excessive capacitance; used only for single-ended low-speed I/O. | Choose only for non-high-speed, single-ended GPIO protection where cost is primary and capacitance tolerance >10 pF is acceptable. |
Compared with TPD2E001DRYR and ESD5Z3.3T5G, the CM1224-02SR uniquely combines dual-channel operation, sub-1 pF loading, and Zener-integrated supply protection - enabling complete ESD solution for USB 2.0 and FireWire with zero external passive components on VP.
Availability
CM1224-02SR is available at Aetrix Electronics and suitable for USB 2.0 interface protection, IEEE1394 port hardening, and HDMI/DVI data lane safeguarding requiring stable component supply and consistent lead-free manufacturing.
Supply support for CM1224-02SR 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 focused on energy-efficient innovation, serving automotive, industrial, cloud, medical, and IoT markets with discrete, analog, and power management solutions.
The CM1224-02SR belongs to onsemi's low-capacitance ESD protection array family, engineered specifically for high-speed serial interfaces where signal integrity, minimal board area, and autonomous supply rail protection are mandatory design criteria.
FAQ
What is the maximum operating temperature range for the CM1224-02SR?
The CM1224-02SR is rated for continuous operation from –40°C to +85°C, matching industrial-grade environmental requirements. This range is validated per Table 2 and Table 3 in the official datasheet, and applies to all electrical characteristics including leakage current, clamping voltage, and capacitance stability across temperature.
Does the CM1224-02SR require an external bypass capacitor on the VP pin?
No, the CM1224-02SR does not require an external bypass capacitor on the VP pin because it integrates a Zener diode between VP and VN. This Zener clamps supply rail transients and absorbs positive ESD energy directly - eliminating the need for external capacitance and reducing PCB component count and layout complexity.
How many ESD strikes can the CM1224-02SR withstand before degradation?
The CM1224-02SR is specified to withstand over 1000 ESD strikes at ±8 kV contact discharge (IEC 61000−4−2 Level 4) without performance degradation. This endurance is confirmed in the "Features" section of the datasheet and ensures long-term reliability in consumer electronics subject to repeated handling and connector insertion cycles.
What is the channel input capacitance matching specification for the CM1224-02SR?
The CM1224-02SR provides 0.02 pF typical channel input capacitance matching between CH1 and CH2 at 1 MHz, VP = 3.3 V, VN = 0 V, and VIN = 1.65 V. This tight matching minimizes differential skew and preserves signal integrity in high-speed differential interfaces such as USB 2.0 and IEEE1394.
Is the CM1224-02SR compatible with lead-free reflow soldering processes?
Yes, the CM1224-02SR is manufactured in a lead-free SOT143−4 package (Case 318A) and fully compatible with standard Pb-free reflow profiles. Its specifications and mechanical drawings confirm compliance with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and IPC/JEDEC reflow guidelines.
CM1224-02SR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-253-4, TO-253AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 2
- 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-143
CM1224-02SR FAQ
1.How can I place an order for CM1224-02SR through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1224-02SR 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 CM1224-02SR reliable?
The price and inventory of CM1224-02SR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1224-02SR is usually 5 days.
3.What payment methods are accepted for CM1224-02SR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1224-02SR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1224-02SR?
CM1224-02SR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1224-02SR 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 CM1224-02SR?
For technical support, including CM1224-02SR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1224-02SR requirements.
6.How does Aetrix verify that CM1224-02SR is sourced from the original manufacturer or authorized distributors?
All CM1224-02SR 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 CM1224-02SR meets industry standards.
7.What is the process for return or replacement of CM1224-02SR?
All CM1224-02SR units undergo pre-shipment inspection (PSI). If there is an issue with CM1224-02SR, 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 CM1224-02SR part is unused and in its original packaging.
Return procedure for CM1224-02SR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1224-02SR 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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