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onsemi CM1223-02SR
- Part No.:
- CM1223-02SR
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
CM1223-02SR.pdf
- Description:
- TVS DIODE 3.3VWM 8.8VC SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,483
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Product details
Overview
CM1223-02SR from onsemi is a 2-channel ESD protection diode array in SOT143-4 package, designed for high-speed data lines requiring ultra-low capacitance (1.0 pF typical), ±8 kV IEC 61000−4−2 contact ESD protection, and integrated backdrive current blocking. It protects USB 2.0 and HDMI signal paths by steering ESD transients to VP/VN rails while suppressing reverse current flow into unpowered subsystems.
For engineers reviewing the CM1223-02SR datasheet, pinout, applications, or equivalent options, key selection criteria include channel count, 1.0 pF input capacitance, 4-pin SOT143 footprint, ±15 kV HBM rating, and backdrive diode integration-critical for hot-plug interfaces like removable storage and digital video ports.
Technical Context
The CM1223-02SR implements a dual-diode series architecture per channel, with each I/O pin connected via stacked diodes to VP (positive rail) and VN (ground rail), enabling bidirectional ESD current steering. A Zener diode between VP and VN clamps positive surges and eliminates need for external bypass capacitors.
Integrated backdrive protection uses a dedicated diode between VP and VN to limit reverse current to ≤5 µA when an I/O pin voltage exceeds the supply rail-preventing unintended power-up of unpowered devices in HDMI or USB interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating (IEC 61000−4−2) | ±8 kV contact discharge - meets Level 4 system-level immunity without external TVS stacking |
| Channel Input Capacitance | 1.0 pF typical at 1 MHz - preserves signal integrity up to 480 Mbps (USB 2.0) with minimal rise-time degradation |
| Capacitance Matching | 0.02 pF typical difference between channels - enables precise differential pair protection without skew |
| Clamp Voltage (Positive) | +8.8 V at 1 A, 8/20 µs - limits transient overvoltage to safe levels for 3.3 V or 5 V interface ICs |
| Operating Supply Voltage | 3.3 V to 5.5 V (VP–VN) - supports both USB 2.0 and HDMI 1.4 logic-level domains |
| Backdrive Current Limit | ≤5 µA max when I/O > VP - prevents bulk capacitor charging in unpowered peripherals during hot-plug |
| HBM ESD Rating | ±15 kV - exceeds MIL-STD-883 Method 3015 for robust handling in manufacturing and field use |
Pinout & Package
CM1223-02SR is housed in a Pb-free 4-pin SOT143-4 package (case 318A), measuring 2.92 × 2.37 × 1.01 mm, optimized for space-constrained PCB layouts near high-speed connectors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VN | Ground reference rail - connects directly to system GND plane to provide low-inductance return path for ESD current |
| 2 | CH1 | Protected I/O channel - routes high-speed signal (e.g., USB D+) through internal diode stack to VP/VN |
| 3 | CH2 | Protected I/O channel - routes complementary signal (e.g., USB D−) with matched 0.02 pF capacitance delta |
| 4 | VP | Positive supply rail - accepts 3.3 V or 5 V bias; integrates Zener for rail clamping and eliminates external decoupling cap |
Key Features
| Feature | Design Value |
|---|---|
| Two-channel ESD + backdrive protection | Single 4-pin device replaces discrete diode + Zener + backdrive diode solution, reducing BOM count and layout area |
| 1.0 pF typical input capacitance | Enables full-speed USB 2.0 (480 Mbps) and HDMI 1.4 compliance without signal attenuation or jitter increase |
| 0.02 pF channel-to-channel capacitance mismatch | Maintains <1 ps skew across differential pairs - critical for DVI/HDMI TMDS clock/data eye stability |
| Zener-based VP rail clamping | Eliminates need for external 100 nF bypass capacitor, simplifying layout and improving high-frequency noise immunity |
| Pb-free SOT143-4 package | RoHS-compliant footprint compatible with standard reflow profiles and automated optical inspection (AOI) |
Applications
| USB 2.0 Port Protection | HDMI Source Interface |
|---|---|
Use Scenario: Protecting D+ and D− lines of a notebook USB 2.0 host port against ESD events during cable insertion/removal. IC Role / Device Role / Timing Role: ESD transient suppressor placed within 3 mm of USB connector, clamping surges before reaching USB transceiver PHY. Use Value: 1.0 pF loading ensures <1% rise-time degradation at 480 Mbps; ±8 kV contact rating satisfies IEC 61000−4−2 Level 4 system certification. |
Use Scenario: Shielding TMDS clock and data lanes of an HDMI source (e.g., set-top box GPU output) from user-handling ESD. IC Role / Device Role / Timing Role: Dual-channel protector applied to one TMDS differential pair, leveraging 0.02 pF matching to preserve common-mode rejection. Use Value: Mutual capacitance of 0.11 pF minimizes crosstalk between adjacent TMDS lanes; backdrive blocking prevents sink-side power leakage into unpowered displays. |
| DVI-D Interface Protection | PCIe Gen1 Hot-Plug Detection Line |
Use Scenario: Securing DVI-D transmitter outputs in LCD monitors against ESD during cable mating in industrial environments. IC Role / Device Role / Timing Role: Two independent ESD channels safeguarding TMDS+ and TMDS−, referenced to local 3.3 V rail (VP) and chassis ground (VN). Use Value: 8.8 V positive clamp voltage stays below absolute maximum ratings of TI TFP410 and similar DVI serializers; 0.11 pF mutual capacitance avoids inter-lane jitter coupling. |
Use Scenario: Protecting PCIe PERST# and WAKE# detection lines in embedded systems where hot-plug events induce backdrive currents. IC Role / Device Role / Timing Role: Single CM1223-02SR used across two control lines, using CH1/CH2 to block reverse current from powered slots into unpowered root complexes. Use Value: ≤5 µA backdrive leakage prevents false assertion of reset states; ±15 kV HBM rating ensures reliability during board-level handling and field service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR | 2-channel, 1.0 pF, ±8 kV IEC, but no integrated backdrive diode; requires external bias network for rail clamping | Lacks VP–VN Zener and backdrive blocking - unsuitable for HDMI hot-plug scenarios where reverse current must be suppressed | Select when only basic ESD protection is needed and system design allows separate rail decoupling and no backdrive risk |
| SP1002-02UTG | 2-channel, 0.6 pF, ±12 kV IEC, but no backdrive protection and no Zener rail clamp; uses different SOT-23-6 footprint | Lower capacitance benefits >1 Gbps links, but absence of backdrive function excludes use in powered-peripheral interconnects | Prefer for ultra-high-speed serial links (e.g., SATA III) where backdrive is not a concern and layout permits SOT-23-6 placement |
Compared with TPD2E001DRYR and SP1002-02UTG, the CM1223-02SR uniquely integrates backdrive current blocking and VP rail Zener clamping in a 4-pin SOT143, enabling single-component protection for hot-pluggable interfaces without external components or layout compromises.
Availability
CM1223-02SR is available at Aetrix Electronics and suitable for USB 2.0 port protection, HDMI source interface hardening, and DVI-D transmitter safeguarding requiring stable component supply across industrial, consumer, and embedded design cycles.
Supply support for CM1223-02SR 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 specializing in energy-efficient power management, analog, sensor, and ESD protection solutions for automotive, industrial, and computing markets.
The CM1223 family was developed specifically for high-speed digital interface protection, addressing the need for sub-1.5 pF ESD arrays with integrated backdrive blocking in compact surface-mount packages.
FAQ
What is the maximum operating voltage range for the CM1223-02SR?
The CM1223-02SR supports an operating supply voltage (VP − VN) of 3.3 V to 5.5 V, with absolute maximum rating of 6.0 V. This range covers standard USB 2.0 (3.3 V) and HDMI 1.4 (5 V) interface logic levels. Operation outside this range may compromise ESD clamping performance or cause permanent damage. The CM1223-02SR must be biased within this window to ensure proper diode conduction and Zener clamping behavior.
Does the CM1223-02SR require external bypass capacitors on the VP rail?
No, the CM1223-02SR does not require external bypass capacitors on the VP rail because it integrates a Zener diode between VP and VN that absorbs positive ESD strikes and stabilizes the supply rail. This internal Zener eliminates the need for external 100 nF ceramic capacitors typically used with discrete ESD arrays, simplifying PCB layout and reducing component count. The CM1223-02SR achieves rail stabilization solely through its monolithic structure.
How does the backdrive protection function in the CM1223-02SR?
The CM1223-02SR incorporates a dedicated diode between VP and VN that blocks reverse current flow when an I/O pin voltage exceeds the VP supply level-limiting leakage to ≤5 µA. This prevents unpowered peripherals (e.g., HDMI displays) from inadvertently charging upstream power rails during hot-plug events. The backdrive protection is intrinsic to the CM1223-02SR die and requires no external circuitry or configuration.
Can the CM1223-02SR be used for differential signal protection such as USB D+/D−?
Yes, the CM1223-02SR is explicitly designed for differential signal protection: its 0.02 pF typical capacitance mismatch between CH1 and CH2 ensures balanced loading across D+ and D−, preserving signal symmetry and minimizing skew. With 1.0 pF typical input capacitance and 0.11 pF mutual capacitance, the CM1223-02SR maintains USB 2.0 eye diagrams and meets full-speed timing budgets without degrading jitter or rise time.
What is the thermal performance of the CM1223-02SR in SOT143-4 package?
The CM1223-02SR in SOT143-4 package has a specified package power rating of 225 mW under standard operating conditions. Its thermal resistance (θJA) is optimized for surface-mount operation on 2-layer PCBs with standard copper pour; derating is required above +85°C ambient. The CM1223-02SR's low dynamic resistance (0.7 Ω positive, 0.4 Ω negative) minimizes self-heating during ESD events, ensuring reliable clamping without thermal runaway.
CM1223-02SR 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:
- 8.8V (Typ)
- Current - Peak Pulse (10/1000µs):
- 1A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143
CM1223-02SR FAQ
1.How can I place an order for CM1223-02SR through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1223-02SR 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 CM1223-02SR reliable?
The price and inventory of CM1223-02SR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1223-02SR is usually 5 days.
3.What payment methods are accepted for CM1223-02SR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1223-02SR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1223-02SR?
CM1223-02SR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1223-02SR 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 CM1223-02SR?
For technical support, including CM1223-02SR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1223-02SR requirements.
6.How does Aetrix verify that CM1223-02SR is sourced from the original manufacturer or authorized distributors?
All CM1223-02SR 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 CM1223-02SR meets industry standards.
7.What is the process for return or replacement of CM1223-02SR?
All CM1223-02SR units undergo pre-shipment inspection (PSI). If there is an issue with CM1223-02SR, 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 CM1223-02SR part is unused and in its original packaging.
Return procedure for CM1223-02SR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1223-02SR 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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