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onsemi CM1248-04S9
- Part No.:
- CM1248-04S9
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOT-953
- Datasheet:
-
CM1248-04S9.pdf
- Description:
- TVS DIODE 6.1VWM 6.8VC SOT953
- Quantity:
- Payment:
- Shipping:
Inventory:6,487
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Product details
Overview
CM1248-04S9 from onsemi is a low-capacitance transient voltage suppressor (TVS) array designed for ESD protection of high-speed data lines. It features 4-channel unidirectional TVS diodes with 10 pF typical input capacitance at 0 V, ±15 kV IEC 61000-4-2 contact ESD rating, and 5.5 V reverse stand-off voltage - deployed in USB 2.0, HDMI, and MHL interface protection.
For engineers reviewing the CM1248-04S9 datasheet, pinout, applications, or equivalent options, key selection criteria include low I/O capacitance (<13 pF), guaranteed ±15 kV IEC ESD robustness, VN-common anode architecture, SOT-953 5-lead package footprint, and leakage current ≤0.75 µA at 5 V.
Technical Context
The CM1248-04S9 integrates four independent unidirectional TVS diodes sharing a common anode (VN), enabling compact protection of bidirectional signal pairs without polarity constraints on cathodes. Its low 10 pF channel capacitance minimizes signal integrity impact on 480 Mbps USB 2.0 channels.
It operates across −40 °C to +85 °C, withstands ≥1000 ESD strikes per I/O, and clamps transients to +6.8 V (positive) and −0.89 V (negative) at 10 mA - critical for safeguarding 3.3 V/5 V logic interfaces against fast-rising ESD events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 4 independent unidirectional TVS diodes, each protecting one I/O line |
| Input Capacitance | 10 pF typical at 0 V - preserves signal rise/fall times in USB 2.0 and HDMI 1.4 |
| ESD Rating | ±15 kV contact discharge per IEC 61000-4-2 - exceeds industrial immunity requirements |
| Reverse Stand-off Voltage | 5.5 V at IR = 10 µA - ensures no conduction during normal 5 V operation |
| Clamp Voltage | +6.8 V / −0.89 V at 10 mA - limits voltage excursion below 3.3 V I/O absolute max ratings |
| Leakage Current | ≤0.75 µA at 5.0 V - avoids DC loading on high-impedance sensor or analog lines |
Pinout & Package
CM1248-04S9 is housed in a Pb-free, RoHS-compliant 5-lead SOT-953 (Case 527AE) surface-mount package measuring 1.00 mm × 0.80 mm × 0.40 mm - optimized for space-constrained mobile and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH1 (Pin 1) | TVS cathode for Channel 1 | Connected to protected signal line (e.g., USB D+); clamps positive transients to VN |
| VN (Pin 2) | Common anode node | Must be tied to system ground or local reference plane; shared return path for all 4 channels |
| CH2 (Pin 3) | TVS cathode for Channel 2 | Connected to second protected signal (e.g., USB D−); enables differential pair protection |
| CH3 (Pin 4) | TVS cathode for Channel 3 | Supports third I/O line (e.g., HDMI TMDS clock or data); identical electrical behavior to CH1/CH2 |
| CH4 (Pin 5) | TVS cathode for Channel 4 | Completes quad-channel coverage (e.g., HDMI TMDS data lanes); no internal series resistance |
Key Features
| Feature | Design Value |
|---|---|
| Low I/O capacitance | 10 pF typical at 0 V - maintains >200 MHz bandwidth for USB 2.0 eye diagram compliance |
| IEC 61000-4-2 ESD robustness | ±15 kV contact discharge - eliminates need for secondary board-level ESD mitigation |
| VN-common architecture | Single anode (Pin 2) simplifies PCB grounding and reduces trace count vs. discrete diodes |
| ESD strike endurance | ≥1000 strikes per channel - supports production-line ESD testing and field reliability |
Applications
| USB 2.0 Interface Protection | HDMI 1.4 Data Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− differential pair in smartphones and tablets against electrostatic discharge during cable insertion. IC Role / Device Role / Timing Role: Unidirectional TVS array providing low-capacitance clamping to ground via shared VN node. Use Value: 10 pF capacitance prevents signal degradation at 480 Mbps; ±15 kV rating meets IEC 61000-4-2 Level 4 immunity. | Use Scenario: Safeguarding HDMI 1.4 TMDS data channels (Ch0–Ch2) and clock line against ESD in set-top boxes and monitors. IC Role / Device Role / Timing Role: Quad-channel TVS with common anode, placed directly at HDMI connector to minimize inductance. Use Value: 6.8 V positive clamp ensures TMDS receivers (VDDIO = 3.3 V) remain within absolute maximum ratings during ESD events. |
| MHL Interface Protection | Mobile Display Port (eDP) Lane Protection |
Use Scenario: ESD hardening of Mobile High-Definition Link (MHL) Alt Mode signals over USB Type-C connectors in docking stations. IC Role / Device Role / Timing Role: Four-channel TVS suppressing fast transients on MHL's bi-directional D+/D− and sideband use (SBUs) lines. Use Value: 0.19 pF differential capacitance at 2.5 V preserves MHL 3.0 timing margins and jitter performance. | Use Scenario: Protecting eDP main link lanes (LANE0–LANE3) in ultra-thin laptops where layout area is constrained. IC Role / Device Role / Timing Role: Compact SOT-953 quad TVS placed adjacent to eDP connector to reduce loop inductance. Use Value: 5-lead footprint occupies <0.8 mm² PCB area - 60% smaller than dual-SOT-23 alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD4E05U06DQAR | 4-channel, 0.5-pF typical capacitance, 5.5-V stand-off, but uses DQA (X2SON-10) package with 10 pins and separate GND pins | Requires dedicated ground routing per channel; better for ultra-high-speed (>5 Gbps) interfaces | Select when lower capacitance (<0.6 pF) is mandatory and board space allows larger footprint |
| ESD5Z3.3T5G | Single-channel, 3.3-V stand-off, 12-pF capacitance, SOD-523 package - not quad-channel or VN-common | Needs four discrete placements; higher total capacitance and layout complexity | Choose only if existing design uses SOD-523 and cannot accommodate SOT-953 footprint |
Compared with TPD4E05U06DQAR and ESD5Z3.3T5G, the CM1248-04S9 delivers optimal balance of low capacitance (10 pF), quad integration, and minimal footprint - making it preferred for cost-sensitive, space-constrained USB/HDMI designs where ±15 kV ESD immunity is required.
Availability
CM1248-04S9 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI 1.4 data line hardening, and MHL Alt Mode safeguarding requiring stable component supply and full RoHS compliance.
Supply support for CM1248-04S9 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 power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.
The CM1248-04S9 belongs to onsemi's low-capacitance ESD protection portfolio, engineered specifically for high-speed serial interfaces where signal integrity and board space are critical constraints.
FAQ
What is the maximum operating temperature range for the CM1248-04S9?
The CM1248-04S9 is rated for continuous operation from −40 °C to +85 °C, as specified in Table 3 of its datasheet. This range covers standard commercial and extended industrial environments. Thermal derating is not required within this span, and the device maintains full ESD performance and leakage specifications across the entire range. The CM1248-04S9 must not be operated outside these limits to ensure reliability and compliance with IEC 61000-4-2 test conditions.
Does the CM1248-04S9 support bidirectional signal lines like USB D+ and D−?
Yes - the CM1248-04S9 supports bidirectional data lines via its unidirectional TVS architecture with a common anode (VN). Each cathode (CH1–CH4) clamps positive transients to VN (ground), while negative transients are clamped by the forward conduction of the diode to ~−0.89 V. This configuration protects both polarities of signals such as USB 2.0 D+/D− without requiring external biasing. The CM1248-04S9 achieves this with no additional components or layout changes.
What is the meaning of "VN" in the CM1248-04S9 pinout?
VN is the common anode terminal (Pin 2) for all four integrated TVS diodes in the CM1248-04S9. It must be connected directly to the system ground plane with low-inductance routing to ensure effective ESD current shunting. Unlike discrete diodes with individual anodes, VN provides a single, shared return path - reducing PCB trace count and minimizing ground bounce. Proper VN connection is essential for the CM1248-04S9 to achieve its specified ±15 kV IEC 61000-4-2 performance.
Can the CM1248-04S9 be used for HDMI 2.0 or higher-speed interfaces?
No - the CM1248-04S9 is not recommended for HDMI 2.0 (6 Gbps) or higher-speed interfaces due to its 10 pF typical capacitance, which introduces excessive signal loss and jitter at multi-GHz frequencies. It is validated for HDMI 1.4 (up to 3.4 Gbps) and USB 2.0 (480 Mbps). For HDMI 2.0/2.1, onsemi offers lower-capacitance alternatives like the TPD4E05U06DQAR (0.5 pF). The CM1248-04S9 remains optimal for legacy and cost-sensitive HDMI 1.4 implementations.
Is the CM1248-04S9 RoHS compliant and lead-free?
Yes - the CM1248-04S9 is explicitly marked as Pb-free and RoHS compliant in the ordering information and marking diagram sections of its datasheet. It meets EU Directive 2011/65/EU and subsequent amendments, with homogeneous material analysis confirming lead content <1000 ppm. The SOT-953 package uses matte tin (Sn) termination, and the CM1248-04S9 is qualified per J-STD-020 moisture sensitivity level 1 (MSL-1), suitable for standard reflow profiles.
CM1248-04S9 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SOT-953
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 6.1V (Min)
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- 6.8V (Typ)
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-953
CM1248-04S9 FAQ
1.How can I place an order for CM1248-04S9 through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1248-04S9 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 CM1248-04S9 reliable?
The price and inventory of CM1248-04S9 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1248-04S9 is usually 5 days.
3.What payment methods are accepted for CM1248-04S9?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1248-04S9 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1248-04S9?
CM1248-04S9 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1248-04S9 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 CM1248-04S9?
For technical support, including CM1248-04S9 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1248-04S9 requirements.
6.How does Aetrix verify that CM1248-04S9 is sourced from the original manufacturer or authorized distributors?
All CM1248-04S9 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 CM1248-04S9 meets industry standards.
7.What is the process for return or replacement of CM1248-04S9?
All CM1248-04S9 units undergo pre-shipment inspection (PSI). If there is an issue with CM1248-04S9, 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 CM1248-04S9 part is unused and in its original packaging.
Return procedure for CM1248-04S9:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1248-04S9 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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