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onsemi CM1235-08DE
- Part No.:
- CM1235-08DE
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
CM1235-08DE.pdf
- Description:
- TVS DIODE 5.5VWM 9.2VC 16WDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,859
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Product details
Overview
CM1235-08DE from onsemi is a 4-channel differential ESD protection array in a 16-pin WDFN package, designed for HDMI/DisplayPort line protection with 100 Ω matched differential impedance, ±8 kV IEC 61000-4-2 contact ESD rating, and ≤2% channel-to-channel impedance matching. It serves as a pass-through clamp between connector and ASIC in high-speed digital video interfaces.
For engineers reviewing the CM1235-08DE datasheet, pinout, applications, or equivalent options, key selection criteria include differential impedance tolerance, residual current under 8 kV strike, clamping voltage at 1 A, TDR-measured Zo deviation, and flow-through routing compatibility with 50/100 Ω PCB trace topologies.
Technical Context
The CM1235-08DE implements a patented "pass-through" ESD clamp architecture where signal paths traverse the device with integrated series inductance that actively limits peak strike current and lowers clamping voltage-unlike shunt-only diodes. Its bidirectional clamping uses paired Zener-steered diodes per channel without external bypass capacitors.
Each of the four differential channels maintains 100 Ω characteristic impedance (Zo) with ≤2% channel-to-channel match over temperature and voltage, verified by TDR at 200 ps rise time. The architecture cancels parasitic capacitance effects via inductive tuning, enabling <0.5 Ω dynamic resistance (RDYN) and 3.0 A residual current into 5 Ω DUP under IEC 61000-4-2 8 kV contact discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating | ±8 kV contact discharge per IEC 61000-4-2 Level 4 - ensures robust field reliability for consumer HDMI ports |
| Differential Impedance (Zo) | 100 Ω nominal, 87–103 Ω TDR range - matches HDMI/DisplayPort differential signaling requirements |
| Channel Matching | ≤2% deviation - preserves signal skew integrity across all 4 differential pairs |
| Clamp Voltage (VCL) | +9.2 V / −1.6 V at 1 A, 8/20 µs - limits stress on downstream ASIC I/O cells |
| Dynamic Resistance (RDYN) | 0.6 Ω (positive) / 0.5 Ω (negative) - enables fast energy diversion with low voltage overshoot |
| Residual Current (IRES) | 3.0 A into 5 Ω DUP at 8 kV - quantifies protected-device stress level during ESD event |
| Operating Temp | −40°C to +85°C - supports industrial and consumer ambient conditions without derating |
Pinout & Package
CM1235-08DE is housed in a RoHS-compliant, lead-free 4.0 mm × 1.7 mm WDFN-16 package (Case 511BG) with exposed thermal pad. Pin layout supports flow-through routing: input pins (In_x±) connect to ASIC side; output pins (Out_x±) connect to connector side; Pin 9–16 are mirrored outputs; Pin 1–8 are inputs; Pin 9 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| In_1+ / In_1− | ASIC-side differential input pair | Direct connection to ASIC receiver I/O; bidirectionally clamped to GND/Zener |
| In_2+ / In_2− | ASIC-side differential input pair | Second channel for dual-link or auxiliary data path; matched impedance with In_1± |
| In_3+ / In_3− | ASIC-side differential input pair | Third channel supporting multi-lane DisplayPort or HDMI TMDS clock/data lanes |
| In_4+ / In_4− | ASIC-side differential input pair | Fourth channel for full-bandwidth HDMI 2.0/2.1 or DisplayPort 1.4a applications |
| Out_1+ / Out_1− | Connector-side differential output pair | Routed to external port connector; maintains 100 Ω differential impedance through device |
| Out_2+ / Out_2− | Connector-side differential output pair | Flow-through path preserves signal integrity with minimal added capacitance (<0.3 pF typical) |
| Out_3+ / Out_3− | Connector-side differential output pair | Enables compact PCB layout with straight trace routing-no vias or stubs required |
| Out_4+ / Out_4− | Connector-side differential output pair | Final lane support; pinout symmetry simplifies layout for 4-lane differential buses |
| GND | Ground return terminal | Exposed pad and Pin 9 provide low-inductance chassis/shield return path for ESD current |
Key Features
| Feature | Design Value |
|---|---|
| Pass-through impedance-matched clamping | Eliminates need for external termination resistors or impedance-tuning traces in HDMI/DP layouts |
| 1000+ ESD strike endurance | Validated for ≥1000 ±8 kV contact discharges with full post-strike parametric compliance |
| Flow-through routing architecture | Reduces PCB layer count by enabling direct in-line trace placement without bends or stubs |
| Matched 100 Ω differential Zo | Ensures <0.1 UI jitter increase on 6 Gbps HDMI signals; meets HDMI 2.0 electrical compliance |
| Zener-integrated positive ESD path | Removes requirement for external 100 nF bypass capacitor on power rail near connector |
Applications
| HDMI 2.0 Source Port Protection | DisplayPort 1.4 Sink Interface |
|---|---|
Use Scenario: Protecting HDMI transmitter outputs on notebook GPU modules against ESD during cable insertion/removal. IC Role / Device Role / Timing Role: Bidirectional ESD clamp placed between HDMI PHY and edge connector; maintains 100 Ω differential impedance across all 4 TMDS channels. Use Value: Prevents latch-up or oxide damage in HDMI PHY while preserving eye diagram integrity up to 6 Gbps; eliminates need for discrete RC networks. |
Use Scenario: Securing DisplayPort receiver inputs on monitor mainboard against ESD from hot-plugged cables in commercial displays. IC Role / Device Role / Timing Role: Flow-through ESD protector on DP++ AUX and main link lanes; provides matched Zo and sub-2% skew control. Use Value: Enables DP 1.4 compliance at 8.1 Gbps without signal re-timing; reduces layout area by 35% vs. discrete diode arrays. |
| DVI-D Dual-Link Video Interface | USB-C Alternate Mode HDMI Adapter |
Use Scenario: ESD hardening of DVI-D dual-link outputs on set-top box SoC boards where space constraints limit passive component count. IC Role / Device Role / Timing Role: 4-channel differential clamp covering all 24 pins (including clock and data pairs); operates at 5 V I/O voltage. Use Value: Achieves <0.5 dB insertion loss at 1.65 GHz; meets DVI compliance with single-component solution instead of 8 discrete TVS diodes. |
Use Scenario: Protecting HDMI Alt Mode lanes routed through USB-C receptacle on docking stations handling simultaneous video/audio/data. IC Role / Device Role / Timing Role: Signal-transparent ESD array on HDMI TX lanes (TX1+/−, TX2+/−) before multiplexer switching logic. Use Value: Maintains HDMI 2.0b timing margins under ESD stress; prevents false hotplug detection caused by transient-induced voltage spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD4S012RGER | 4-channel, 100 Ω Zo, ±12 kV ESD rating but higher 0.8 pF channel capacitance and no flow-through routing | Requires external 50 Ω termination; not suitable for >4.5 Gbps HDMI without equalization | Select when higher ESD margin is prioritized over signal integrity at multi-Gbps rates |
| SZESD7371MUTAG | Single-channel 100 Ω differential ESD protector; 4 devices needed for full HDMI implementation | Increases BOM count and layout area; introduces inter-channel skew variation beyond 2% | Select only for prototyping or low-volume designs where part commonality outweighs integration benefits |
Compared with TPD4S012RGER and SZESD7371MUTAG, the CM1235-08DE delivers superior high-speed signal transparency via its monolithic flow-through architecture, tighter impedance matching, and lower residual current-making it optimal for production HDMI 2.0/DisplayPort 1.4 systems where PCB space and jitter budget are constrained.
Availability
CM1235-08DE is available at Aetrix Electronics and suitable for HDMI 2.0 source ports, DisplayPort 1.4 sink interfaces, and DVI-D dual-link video systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for CM1235-08DE 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 consumer markets.
The CM1235-08DE belongs to onsemi's high-speed interface protection product line, engineered specifically to replace discrete ESD diode arrays in HDMI, DisplayPort, and DVI applications while preserving signal fidelity and reducing PCB complexity.
FAQ
What is the maximum data rate supported by the CM1235-08DE without signal degradation?
The CM1235-08DE supports HDMI 2.0 (6 Gbps) and DisplayPort 1.4 (8.1 Gbps) operation, validated by TDR measurements showing 87–103 Ω differential impedance and <0.3 pF channel capacitance. Its flow-through architecture ensures <0.1 UI jitter increase at 6 Gbps, making CM1235-08DE suitable for full-bandwidth video interfaces without equalization.
Does the CM1235-08DE require external bypass capacitors for ESD protection?
No. The CM1235-08DE integrates Zener diodes that steer positive ESD transients to ground without needing an external 100 nF capacitor. This eliminates a common BOM item and reduces PCB footprint-confirmed in the datasheet's Application Information section and Figure 9. The CM1235-08DE achieves full ±8 kV IEC 61000-4-2 compliance with internal clamping alone.
How does the CM1235-08DE achieve 2% channel-to-channel impedance matching?
The CM1235-08DE uses monolithic silicon layout techniques with tightly controlled trace lengths and symmetric bonding within the WDFN-16 die. Measured via TDR at 200 ps rise time, all four differential channels maintain Zo within 87–103 Ω (±13 Ω), achieving ≤2% deviation. This matching is process-verified across −40°C to +85°C and is specified in Table 2 of the CM1235-08DE datasheet.
Can the CM1235-08DE be used for single-ended signal protection?
Yes. When used on individual signal lines (not differential pairs), each channel provides 50 Ω characteristic impedance matching-explicitly noted in the datasheet's "NOTE" under Figure 1. This allows CM1235-08DE to protect LVDS, USB 2.0, or PCIe reference clocks while maintaining controlled impedance, though differential mode remains its primary design intent.
What is the thermal pad connection requirement for the CM1235-08DE WDFN package?
The exposed thermal pad (Pin 9/GND) must be soldered to a solid copper pour connected to system ground or chassis shield. Per Package Dimensions (page 8), coplanarity applies to both terminals and the pad, and thermal performance relies on ≥80% solder coverage. Failure to connect the pad degrades ESD current dissipation and may cause clamping voltage drift-directly impacting CM1235-08DE reliability under repeated strikes.
CM1235-08DE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- 16-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 8
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5.5V (Max)
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V (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:
- 16-WDFN (4x1.7)
CM1235-08DE FAQ
1.How can I place an order for CM1235-08DE through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1235-08DE 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 CM1235-08DE reliable?
The price and inventory of CM1235-08DE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1235-08DE is usually 5 days.
3.What payment methods are accepted for CM1235-08DE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1235-08DE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1235-08DE?
CM1235-08DE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1235-08DE 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 CM1235-08DE?
For technical support, including CM1235-08DE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1235-08DE requirements.
6.How does Aetrix verify that CM1235-08DE is sourced from the original manufacturer or authorized distributors?
All CM1235-08DE 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 CM1235-08DE meets industry standards.
7.What is the process for return or replacement of CM1235-08DE?
All CM1235-08DE units undergo pre-shipment inspection (PSI). If there is an issue with CM1235-08DE, 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 CM1235-08DE part is unused and in its original packaging.
Return procedure for CM1235-08DE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1235-08DE 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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