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onsemi CM1223-04SO
- Part No.:
- CM1223-04SO
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOT-23-6
- Datasheet:
-
CM1223-04SO.pdf
- Description:
- TVS DIODE 3.3VWM 8.8VC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:6,137
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Product details
Overview
CM1223-04SO from onsemi is a 4-channel ESD protection diode array with integrated backdrive protection, designed for high-speed data lines requiring ultra-low capacitance (1.0 pF typical), ±8 kV IEC 61000−4−2 contact discharge rating, and rail-to-rail clamping via VP/VN supply pins. It protects USB 2.0, HDMI, and DVI interfaces in notebooks and digital displays.
For engineers reviewing the CM1223-04SO datasheet, pinout, applications, or equivalent options, key selection criteria include channel count, input capacitance matching (0.02 pF typical), mutual capacitance (0.11 pF), clamp voltage (+8.8 V / −1.4 V at 1 A), and MSOP-10 package compatibility with high-density PCB layouts.
Technical Context
The CM1223-04SO implements a dual-diode steering architecture per channel-directing positive ESD transients to VP and negative transients to VN-combined with an embedded Zener diode between VP and VN to absorb supply-rail ESD strikes. Backdrive protection is achieved via an integrated diode blocking reverse current flow from I/O pins to VP when VP is unpowered.
Each channel delivers symmetrical clamping (VSCL = +6.7 V / −0.60 V at 8 mA), low dynamic resistance (0.7 Ω positive / 0.4 Ω negative), and stable capacitance across temperature and bias voltage-critical for maintaining signal integrity on differential high-speed links like HDMI and USB 2.0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating | ±8 kV contact discharge (IEC 61000−4−2 Level 4); enables robust system-level ESD compliance without external TVS. |
| Channel Input Capacitance | 1.0 pF typical at 1 MHz; preserves signal rise/fall times on 480 Mbps USB 2.0 and 800 Mbps FireWire links. |
| Capacitance Matching | 0.02 pF typical difference between I/O-to-GND paths; minimizes skew in differential pairs (e.g., HDMI TMDS). |
| Mutual Capacitance | 0.11 pF typical between adjacent signal pins; reduces crosstalk in tightly spaced high-speed port layouts. |
| Clamp Voltage | +8.8 V / −1.4 V at 1 A (8/20 µs pulse); limits transient overvoltage to safe levels for downstream 3.3 V or 5 V logic. |
| Supply Voltage Range | VP − VN = 3.3 V to 5.5 V; supports both 3.3 V and 5 V interface rails without level-shifting circuitry. |
| Backdrive Current Limit | ≤5 µA per I/O pin when VIN > VP; prevents unintended power-up of unpowered subsystems (e.g., HDMI sink during source standby). |
Pinout & Package
CM1223-04SO is housed in a lead-free MSOP-10 package (3.0 mm × 3.0 mm × 0.85 mm), optimized for space-constrained high-speed port designs. Its pinout features four independent I/O channels with dedicated VP and VN supply rails, plus six no-connect (NC) terminals enabling flexible PCB routing and noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CH1 | ESD-protected bidirectional I/O line; connects directly to protected signal (e.g., USB D+). |
| 2 | NC | No internal connection; may be left floating or grounded for mechanical stability or thermal relief. |
| 3 | VP | Positive supply rail input; ties to system VCC (3.3 V or 5 V) and provides clamping reference for positive transients. |
| 4 | CH2 | ESD-protected bidirectional I/O line; used for second signal in differential pair (e.g., USB D−). |
| 5 | NC | No internal connection; isolates CH2 from CH3 to minimize inter-channel coupling. |
| 6 | CH3 | ESD-protected bidirectional I/O line; supports third high-speed signal (e.g., HDMI Clock). |
| 7 | NC | No internal connection; separates CH3 and VN to reduce ground bounce coupling. |
| 8 | VN | Negative supply rail input; connects to system GND and serves as clamping reference for negative transients. |
| 9 | CH4 | ESD-protected bidirectional I/O line; completes 4-channel protection set (e.g., HDMI Data2+). |
| 10 | NC | No internal connection; shields CH4 from adjacent traces and improves RF immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated backdrive protection | Blocks reverse current flow from powered I/O into unpowered VP rail-prevents false power-on reset in HDMI-connected devices. |
| Zener-based VP rail protection | Eliminates need for external 0.1 µF bypass capacitor on VP by absorbing ESD energy directly across supply rails. |
| Ultra-low and matched capacitance | 1.0 pF typical input capacitance with 0.02 pF channel-to-channel variation-ensures minimal timing skew on differential signals. |
| High ESD endurance | Withstands >1000 ±8 kV contact discharges per I/O pin-supports long-term reliability in field-deployed consumer electronics. |
| Pb-free MSOP-10 package | RoHS-compliant 3×3 mm footprint with 0.5 mm pitch-enables automated assembly and thermal performance up to 400 mW. |
Applications
| USB 2.0 Port Protection | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+/D− lines of a notebook's USB 2.0 host port against user-handling ESD events during cable insertion. IC Role / Device Role / Timing Role: ESD transient suppressor placed at connector entry point; clamps fast-rising ESD pulses (<1 ns response) before they reach USB transceiver PHY. Use Value: Maintains 480 Mbps signaling integrity with <1.0 pF loading and <0.02 pF channel mismatch-no signal degradation or eye diagram closure. |
Use Scenario: Safeguarding TMDS clock and data lanes of an LCD monitor's HDMI receiver against contact ESD during hot-plug events. IC Role / Device Role / Timing Role: Four-channel bidirectional protector covering CLK, DATA0, DATA1, DATA2; VP/VN rails tied to monitor's 3.3 V supply and chassis GND. Use Value: 0.11 pF mutual capacitance prevents crosstalk-induced jitter; ±8 kV IEC rating meets EN 55032 Class B emissions requirements. |
| DVI Port Protection | Serial ATA Interface Protection |
Use Scenario: Shielding DVI-D dual-link outputs in set-top boxes from ESD induced by metallic HDMI/DVI adapters. IC Role / Device Role / Timing Role: Channel-isolated ESD clamp on R/G/B/CLK lines; NC pins used as guard rings to isolate analog video paths from digital noise. Use Value: 1.0 pF input capacitance avoids RC filtering of 165 MHz pixel clocks; Zener VP protection eliminates need for discrete rail TVS. |
Use Scenario: Securing SATA TX/RX differential pairs in hard disk drive controllers against board-level ESD during manufacturing handling. IC Role / Device Role / Timing Role: Two-channel protection per differential pair (CH1/CH2 for TX+, TX−; CH3/CH4 for RX+, RX−); VP=3.3 V, VN=GND. Use Value: 0.02 pF capacitance matching ensures <1 ps skew between complementary signals-preserves SATA Gen II 3 Gbps eye opening. |
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, 1.0 pF typical capacitance, ±12 kV contact ESD rating, SOT-23-6 package (6-pin, smaller footprint than MSOP-10). | Lacks integrated backdrive protection and VP-VN Zener; requires external 0.1 µF VP bypass capacitor. | Preferred where higher ESD margin (±12 kV) is required and board space is constrained-but not suitable for backdrive-sensitive systems like HDMI sinks. |
| SP3203-04UTG | 4-channel, 0.8 pF typical capacitance, ±8 kV contact ESD, SOT-23-6 package; includes integrated backdrive diode but no VP-VN Zener. | Requires external TVS on VP rail; lower capacitance benefits >5 Gbps interfaces but adds BOM cost and layout complexity. | Best for PCIe or DisplayPort designs needing sub-1 pF loading; avoid when VP rail protection must be self-contained without external components. |
Compared with TPD4E001DRYR and SP3203-04UTG, CM1223-04SO uniquely integrates both backdrive blocking and VP-VN rail clamping in a single MSOP-10 device-reducing component count, eliminating external capacitors, and simplifying layout for HDMI/USB 2.0 ports where supply-rail ESD immunity is critical.
Availability
CM1223-04SO is available at Aetrix Electronics and suitable for USB 2.0, HDMI, and Serial ATA interface protection requiring stable component supply, RoHS compliance, and high-volume tape-and-reel delivery (4000 units per reel).
Supply support for CM1223-04SO 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 silicon solutions for automotive, industrial, cloud, and consumer electronics.
The CM1223 family was developed specifically for high-speed serial interface ESD protection-targeting applications where minimal capacitive loading, rail-to-rail clamping, and backdrive immunity are mandatory for signal integrity and system reliability.
FAQ
What is the maximum operating voltage range for CM1223-04SO?
The CM1223-04SO supports an operating supply voltage range of VP − VN = 3.3 V to 5.5 V, with absolute maximum rating of 6.0 V. This allows direct integration into both 3.3 V and 5 V interface rails without level shifters. The device remains functional across the full −40°C to +85°C industrial temperature range, and its clamp voltage (VSCL) is specified at 3.3 V and 5.5 V bias conditions-ensuring consistent protection behavior in CM1223-04SO deployments.
Does CM1223-04SO require external bypass capacitors on the VP pin?
No, CM1223-04SO does not require external bypass capacitors on the VP pin because it integrates a Zener diode between VP and VN that absorbs ESD energy directly across the supply rails. This design eliminates the need for discrete 0.1 µF ceramic capacitors typically used with other ESD arrays, reducing BOM count and PCB area. All electrical characteristics-including clamp voltage and leakage current-are validated with VP floating (no external capacitor), as confirmed in Table 4 Note 4 of the CM1223-04SO datasheet.
How does the backdrive protection in CM1223-04SO function in practice?
The CM1223-04SO incorporates an integrated backdrive diode between VP and VN that blocks reverse current flow from a powered I/O pin into an unpowered VP rail. For example, when an HDMI source is off but the display remains on, the CM1223-04SO limits backdrive current to ≤5 µA per I/O pin-even if the I/O voltage exceeds VP-preventing unintended charging of downstream bulk capacitance and avoiding improper power-on-reset behavior. This functionality is verified under conditions where VIN > VP, as detailed in the BACKDRIVE PROTECTION section of the CM1223-04SO datasheet.
Can CM1223-04SO be used for differential signal protection such as HDMI TMDS pairs?
Yes, CM1223-04SO is explicitly designed for differential signal protection, including HDMI TMDS lanes. Its 0.02 pF typical channel-to-channel capacitance mismatch ensures minimal skew between complementary signals, while 0.11 pF mutual capacitance between adjacent pins suppresses crosstalk. The device's 1.0 pF typical input capacitance preserves signal integrity at HDMI's 165 MHz pixel clock frequency, and its pinout (CH1–CH4 with isolated NC pins) supports clean routing of differential pairs without shared return paths-making CM1223-04SO a validated solution for HDMI 1.4 and earlier interfaces.
What is the thermal performance limit of CM1223-04SO in MSOP-10 package?
The CM1223-04SO in MSOP-10 package has a rated package power dissipation of 400 mW, as specified in Table 3 of the datasheet. This rating assumes standard PCB layout with adequate copper pour on VP and VN pads for heat spreading. The device operates reliably from −40°C to +85°C ambient, and its thermal resistance (θJA) is optimized for the 3.0 mm × 3.0 mm MSOP-10 footprint-enabling sustained operation under repeated ESD stress without thermal runaway. Derating is not required below 85°C, and the CM1223-04SO maintains full ESD performance specifications across this range.
CM1223-04SO 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:
- 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-23-6
CM1223-04SO FAQ
1.How can I place an order for CM1223-04SO through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1223-04SO 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 CM1223-04SO reliable?
The price and inventory of CM1223-04SO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1223-04SO is usually 5 days.
3.What payment methods are accepted for CM1223-04SO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1223-04SO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1223-04SO?
CM1223-04SO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1223-04SO 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 CM1223-04SO?
For technical support, including CM1223-04SO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1223-04SO requirements.
6.How does Aetrix verify that CM1223-04SO is sourced from the original manufacturer or authorized distributors?
All CM1223-04SO 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 CM1223-04SO meets industry standards.
7.What is the process for return or replacement of CM1223-04SO?
All CM1223-04SO units undergo pre-shipment inspection (PSI). If there is an issue with CM1223-04SO, 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 CM1223-04SO part is unused and in its original packaging.
Return procedure for CM1223-04SO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1223-04SO 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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