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onsemi CM1238-08DE
 Exposed Pad.jpg)
- Part No.:
- CM1238-08DE
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
CM1238-08DE.pdf
- Description:
- TVS DIODE 5.5V 10V 16TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,116
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Product details
Overview
CM1238-08DE from onsemi is a PicoGuard XS ESD clamp array for high-speed differential data lines, providing ±20kV contact / ±25kV air IEC 61000-4-2 Level 4 ESD protection across four matched 100Ω differential channels, with 2% channel-to-channel impedance match and ≤3.8A residual current at 8kV strike-used in HDMI/DVI port protection in digital TVs and set-top boxes.
For engineers reviewing the CM1238-08DE datasheet, pinout, applications, or equivalent options, key selection criteria include differential impedance matching (100Ω), multi-strike endurance (>1000 ESD events), low dynamic clamping resistance (0.7–2.0Ω), and TDFN-16 flow-through routing for signal integrity preservation.
Technical Context
The CM1238-08DE implements a pass-through "PicoGuard XS" architecture where signal paths route directly through the device, enabling 100Ω differential characteristic impedance matching and reducing residual current via series inductive tuning of ESD diodes. Its bidirectional clamping uses paired diodes per channel without external bypass capacitors.
Each of its eight I/O pins supports ±20kV contact discharge per IEC 61000-4-2, with clamp voltage of +10V (positive) and –1.9V (negative) at 1A, and dynamic resistance as low as 0.7Ω (negative transients). Channel-to-channel impedance deviation is limited to 2% for both differential and single-ended (50Ω) configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Rating | ±20kV contact / ±25kV air per IEC 61000-4-2 Level 4 - ensures robust front-end protection against real-world electrostatic discharge events. |
| Differential Impedance | 100Ω ±2% - maintains signal integrity for HDMI/DVI differential pairs without requiring external termination or layout compensation. |
| Clamp Voltage | +10V (positive) / –1.9V (negative) at 1A - limits voltage stress on downstream ASIC I/O cells during ESD transients. |
| Dynamic Resistance | 0.7Ω (negative) / 2.0Ω (positive) - enables fast, low-impedance shunting of ESD current away from protected circuitry. |
| Residual Current | 3.8A at 8kV, RDUP = 5Ω - quantifies peak current reaching protected device, critical for ASIC survivability validation. |
| Multi-Strike Endurance | ≥1000 ESD strikes at ±8kV contact - guarantees sustained protection capability over product lifetime without parameter drift. |
| Operating Temp | –40°C to +85°C - supports deployment in consumer electronics enclosures with passive thermal management. |
Pinout & Package
CM1238-08DE is housed in a RoHS-compliant, lead-free 16-lead TDFN package (4.0 × 1.6 × 0.75 mm, 0.5 mm pitch) with exposed end pads for thermal and grounding performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | In_1+ to In_4− | Bidirectional ESD clamps connected to ASIC-side differential lanes - placed adjacent to IC to minimize trace inductance before protection. |
| 9–16 | Out_4− to Out_1+ | Bidirectional ESD clamps connected to connector-side differential lanes - enables flow-through routing from port to ASIC. |
| PAD | GND | Exposed thermal pad tied to system ground plane - provides low-inductance return path for ESD current and improves thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through signal routing | Eliminates stubs and discontinuities, preserving signal integrity for >1.65 Gbps HDMI data rates without added PCB layer complexity. |
| 100Ω differential impedance match | Reduces reflection-induced jitter and eliminates need for discrete termination resistors or controlled-impedance trace tuning. |
| 2% channel-to-channel Zo match | Minimizes skew between differential pairs, critical for timing-critical interfaces like HDMI TMDS clock and data lanes. |
| No external bypass capacitor required | Integrated Zener-based clamping structure handles positive ESD transients internally, simplifying BOM and reducing board area. |
| 16-pin TDFN with exposed pad | Enables compact placement near connectors while supporting thermal dissipation and low-inductance grounding for ESD current return. |
Applications
| HDMI Port Protection | DVI Interface Protection |
|---|---|
|
Use Scenario: Protecting HDMI source/sink ports in LCD TVs and Blu-ray players against user-handling ESD events during cable insertion. IC Role / Device Role / Timing Role: Bidirectional ESD clamp placed between HDMI connector and SoC PHY, maintaining 100Ω differential impedance across all four TMDS channels. Use Value: Prevents latch-up or gate oxide damage in HDMI transceivers while preserving eye diagram integrity up to 2.25 Gbps. |
Use Scenario: Securing DVI-D dual-link outputs in graphics cards and industrial monitors exposed to frequent cable hot-plug cycles. IC Role / Device Role / Timing Role: Flow-through ESD protection array routing DVI clock and data lanes with matched 100Ω differential impedance and <2% skew. Use Value: Enables reliable operation at 165 MHz pixel clock without signal degradation or post-ESD parameter drift. |
| Set-Top Box Video Outputs | Removable Storage Interfaces |
|
Use Scenario: ESD hardening of HDMI and component video outputs in cable/satellite STBs operating in living-room environments. IC Role / Device Role / Timing Role: Front-end protection device with 1000+ strike endurance, placed within 3 mm of HDMI connector per layout guidelines. Use Value: Eliminates field returns due to ESD-induced video dropouts or HDCP handshake failures after repeated cable connects. |
Use Scenario: Protecting high-speed differential links in USB 2.0 or eSATA ports of external HDD enclosures and media players. IC Role / Device Role / Timing Role: Single-ended mode use of CM1238-08DE channels (50Ω match) for USB D+/D− or eSATA TX/RX lines. Use Value: Provides certified IEC 61000-4-2 Level 4 protection without degrading signal rise/fall times or adding measurable jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD12S521DBTR | 8-channel, 5V-rated, 0.5pF typical capacitance per line; no built-in impedance matching; requires external 100Ω termination. | Targeted at HDMI level-shift + ESD combo; lacks integrated 100Ω differential match and flow-through routing. | Select when level translation is needed alongside ESD protection; avoid if impedance-controlled routing is mandatory. |
| SP3204-01UTG | 4-channel, 5.5V working voltage, 0.35pF capacitance; ±15kV contact rating; no differential impedance specification or channel matching data. | General-purpose high-speed line protection; not validated for HDMI/DVI timing-critical skew or impedance requirements. | Use for cost-sensitive, non-HDMI applications where 100Ω match and <2% skew are not required. |
Compared with TPD12S521DBTR and SP3204-01UTG, the CM1238-08DE uniquely delivers certified 100Ω differential impedance with 2% channel matching and flow-through routing-enabling direct integration into HDMI/DVI reference designs without layout rework or external components.
Availability
CM1238-08DE is available at Aetrix Electronics and suitable for HDMI port protection, DVI interface hardening, and set-top box video output applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CM1238-08DE 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 CM1238-08DE belongs to the PicoGuard XS family-designed specifically for deep sub-micron, high-speed data line protection where ultra-low parasitic loading, precise impedance control, and multi-strike reliability are essential.
FAQ
What is the primary function of the CM1238-08DE in an HDMI design?
The CM1238-08DE serves as a bidirectional ESD protection array for HDMI differential data and clock lanes, providing ±20kV contact discharge protection while maintaining 100Ω differential impedance and <2% channel-to-channel match-ensuring signal integrity and compliance with IEC 61000-4-2 Level 4 without external components. The CM1238-08DE achieves this via its flow-through PicoGuard XS architecture.
Does the CM1238-08DE require external termination resistors for HDMI applications?
No, the CM1238-08DE integrates 100Ω differential characteristic impedance matching directly into its signal path, eliminating the need for external termination resistors or PCB trace impedance tuning. This feature is confirmed in the datasheet's Electrical Operating Characteristics table under Zo = 100Ω and ∆Zo = 2%. The CM1238-08DE sustains this match across temperature and voltage variations.
How many ESD strikes can the CM1238-08DE withstand without performance degradation?
The CM1238-08DE is rated for over 1000 ESD strikes at ±8kV contact discharge under IEC 61000-4-2 conditions, verified by continuous testing with 1-second intervals and post-test parametric validation. This multi-strike endurance applies to each I/O pin individually and is documented in the Functional Description section and Absolute Maximum Ratings table of the CM1238-08DE datasheet.
What package type and dimensions does the CM1238-08DE use?
The CM1238-08DE uses a 16-lead TDFN package with exposed end pads (EEP), measuring 4.0 × 1.6 × 0.75 mm and 0.5 mm pitch, compliant with JEDEC MO-229C except for specified dimensional tolerances. This compact, thermally enhanced package is optimized for placement adjacent to HDMI/DVI connectors and supports automated optical inspection. The CM1238-08DE's pinout enables flow-through routing without vias or stubs.
Can the CM1238-08DE be used for single-ended signal protection?
Yes-the CM1238-08DE supports single-ended operation with 50Ω characteristic impedance per channel, as explicitly stated in the datasheet: "When each of the channels is used individually for single-ended signal lines protection, the individual channel provides 50 characteristic impedance matching." This makes the CM1238-08DE suitable for USB 2.0 D+/D− or other 50Ω interfaces without redesign.
CM1238-08DE 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:
- 10V (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-TDFN EEP (4x1.6)
CM1238-08DE FAQ
1.How can I place an order for CM1238-08DE through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1238-08DE 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 CM1238-08DE reliable?
The price and inventory of CM1238-08DE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1238-08DE is usually 5 days.
3.What payment methods are accepted for CM1238-08DE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1238-08DE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1238-08DE?
CM1238-08DE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1238-08DE 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 CM1238-08DE?
For technical support, including CM1238-08DE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1238-08DE requirements.
6.How does Aetrix verify that CM1238-08DE is sourced from the original manufacturer or authorized distributors?
All CM1238-08DE 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 CM1238-08DE meets industry standards.
7.What is the process for return or replacement of CM1238-08DE?
All CM1238-08DE units undergo pre-shipment inspection (PSI). If there is an issue with CM1238-08DE, 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 CM1238-08DE part is unused and in its original packaging.
Return procedure for CM1238-08DE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1238-08DE Tags
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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
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D5V0L1B2WS-7
Diodes Incorporated
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