onsemi CM1233-08DE

Overview

CM1233-08DE from onsemi is an ESD clamp array designed for high-speed differential data line protection in HDMI and DVI interfaces, featuring 4-channel differential ESD protection, ±8 kV IEC 61000-4-2 contact discharge rating, 100 Ω matched differential impedance per channel, and 2% channel-to-channel impedance matching. It serves as a pass-through signal path between connector and ASIC with minimal capacitive loading.

For engineers reviewing the CM1233-08DE datasheet, pinout, applications, or equivalent options, this device is critical for maintaining signal integrity while delivering robust multi-strike ESD resilience in high-bandwidth consumer and embedded video systems.

Technical Context

The CM1233-08DE implements a flow-through, impedance-matched clamp architecture where signal lines route directly through the device-In_x± to Out_x±-enabling 100 Ω differential and 50 Ω single-ended characteristic impedance. Its design eliminates need for external termination components by embedding matched Z_O and leveraging parasitic inductance to reduce residual current (I_RES = 3.2 A at 8 kV).

Each of its eight bidirectional I/O pins supports ≥1000 ESD strikes at ±8 kV under IEC 61000-4-2 Level 4, with clamping voltage of +10 V (positive) and −1.8 V (negative) at 1 A, and dynamic resistance of 0.9 Ω (positive) / 0.55 Ω (negative), ensuring low-voltage stress on protected ASICs.

Key Specifications

Pinout & Package

CM1233-08DE uses a RoHS-compliant, lead-free WDFN-16 package (6.0 × 4.0 × 0.75 mm, Case 511AY) with exposed thermal pad and 0.75 mm pitch. Pin numbering follows bottom-view orientation with Pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ESD clamp array applications.

Compared with TPD1E05U06DPYR and SP3203-01UTG, the CM1233-08DE uniquely delivers matched 100 Ω differential impedance, 2% channel tracking, and flow-through routing-making it the only option among the three qualified for HDMI 2.0 and DVI dual-link timing-critical applications.

Availability

CM1233-08DE is available at Aetrix Electronics and suitable for HDMI interface protection, DVI port hardening, and high-speed removable storage designs requiring stable component supply, long-term lifecycle support, and consistent RoHS-compliant sourcing.

Supply support for CM1233-08DE 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 focused on energy-efficient power management, analog, sensors, and logic solutions for automotive, industrial, cloud, and consumer markets.

The CM1233-08DE belongs to onsemi's high-speed ESD protection product line, engineered specifically to replace discrete diode arrays in HDMI, DVI, and other impedance-sensitive serial interfaces-prioritizing signal transparency and multi-strike reliability over generic surge suppression.

FAQ

What is the primary function of the CM1233-08DE in an HDMI design?

The CM1233-08DE functions as a bidirectional, impedance-matched ESD clamp array that routes HDMI TMDS differential signals directly through the device-In_x± to Out_x±-while providing ±8 kV IEC 61000-4-2 protection and maintaining 100 Ω differential impedance. This preserves signal integrity up to 6 Gbps without requiring external termination resistors, making CM1233-08DE ideal for space-constrained HDMI source ports in TVs and set-top boxes.

Does the CM1233-08DE support single-ended signal protection?

Yes, the CM1233-08DE supports single-ended operation: each individual channel provides 50 Ω characteristic impedance matching when used on non-differential lines such as USB 2.0 data pairs or LVDS clock lines. The device's datasheet explicitly confirms this mode, and its pinout allows independent use of In_x+/In_x− as separate 50 Ω paths-enabling flexible reuse in mixed-signal PCB layouts without redesign.

How does the CM1233-08DE achieve lower residual current than standard ESD protectors?

The CM1233-08DE achieves I_RES = 3.2 A (vs. >5 A in conventional clamps) by integrating parasitic bond-wire inductance into its protection architecture: L1 on the connector side opposes ESD current rise, limiting peak voltage, while L2 on the ASIC side steers current toward internal clamps. This arrangement lowers clamping voltage and dissipates less energy in the protected device-verified by normalized energy plots in the CM1233-08DE datasheet Figure 6.

What is the maximum continuous current rating for the CM1233-08DE signal paths?

The CM1233-08DE supports 100 mA continuous current per signal path (In_x to Out_x) under 1000-hour stress conditions, as specified in Table 2 of the official datasheet. This rating applies across the full operating temperature range (−40°C to +85°C) and ensures long-term reliability for DC-biased or low-frequency signaling in HDMI auxiliary channels, DDC lines, or sideband use cases-without derating or thermal throttling.

Is the CM1233-08DE pinout compatible with other WDFN-16 ESD arrays?

No, the CM1233-08DE pinout is not compatible with generic WDFN-16 ESD arrays: its unique "flow-through" layout places In_x± on Pins 1–8 and Out_x± on Pins 9–16 in reverse order (e.g., In_1+ = Pin 1, Out_1+ = Pin 16), with GND on Pin 9. Substituting with alternate WDFN-16 parts would require PCB redesign due to reversed signal direction and absence of impedance-matching architecture-only CM1233-08DE delivers this specific routing and Z_O control.