STMicroelectronics DALC208SC6

Overview

DALC208SC6 from STMicroelectronics is a low-capacitance, rail-to-rail ESD protection diode array for high-speed data lines, featuring 4-channel bidirectional protection per diode, 9 V peak reverse voltage (V_RRM), <5 pF input capacitance per channel, and compliance with IEC61000-4-2 Level 4 (±8 kV contact). It is deployed in USB interfaces, audio/video inputs, and microprocessor logic I/O to suppress ESD transients without signal distortion.

For engineers reviewing the DALC208SC6 datasheet, DALC208SC6 pinout, DALC208SC6 application, or DALC208SC6 equivalent, key selection criteria include clamping voltage behavior under IEC61000-4-2 surges, layout-sensitive rail-to-rail topology, low crosstalk (<100 mV pk-pk digital, <−45 dBm analog), and SOT23-6L footprint compatibility with high-density PCB routing.

Technical Context

The DALC208SC6 implements a monolithic rail-to-rail clamping architecture with two reference pins (REF1 = GND, REF2 = V_CC) enabling symmetric positive/negative surge suppression: V_CL+ = V_REF2 + V_F, V_CL− = V_REF1 − V_F. Its dynamic clamping diodes exhibit typical forward threshold V_T = 1.2 V and dynamic resistance R_d = 0.7 Ω.

It delivers <100 mV peak-to-peak digital crosstalk between adjacent I/O channels under 0–5 V, 5 ns edge conditions and maintains <−45 dBm analog crosstalk up to 100 MHz-enabling reliable protection of high-speed serial links including USB Full Speed and video timing signals without data corruption.

Key Specifications

Pinout & Package

Package: SOT23-6L (plastic, lead-free, ECOPACK® compliant; dimensions: 2.80–3.05 mm × 1.50–1.75 mm × 1.10–1.20 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESD5V3U2U-2/TR and TPD2E001DRYR, the DALC208SC6 uniquely delivers true rail-to-rail clamping at 9 V V_RRM with sub-10 pF capacitance-making it optimal for 5 V systems requiring symmetric transient suppression across multiple high-speed lines without signal degradation.

Availability

DALC208SC6 is available at Aetrix Electronics and suitable for USB interface protection, audio/video input protection, and microprocessor logic I/O protection requiring stable component supply and long-term industrial lifecycle support.

Supply support for DALC208SC6 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, power, and analog applications.

The DALC series targets high-speed interface protection, emphasizing ultra-low capacitance, rail-to-rail clamping, and system-level ESD robustness for data-intensive consumer and industrial electronics.

FAQ

What is the mandatory PCB layout requirement for optimal DALC208SC6 performance?

REF1 must be connected directly to GND and REF2 to V_CC using traces shorter than 10 mm and ≥0.5 mm wide. For positive surge suppression, a 100 nF capacitor must be placed between REF2 and GND, adjacent to the device. Layout violations increase clamping voltage by up to 144 V due to parasitic inductance.

Does DALC208SC6 support bidirectional signal transmission such as USB D+ and D−?

Yes. Its rail-to-rail architecture allows full bidirectional signal integrity preservation on AC-coupled or DC-biased differential lines. Measured crosstalk remains below 100 mV pk-pk for 0–5 V, 5 ns edges, and attenuation stays under −10 dB up to 100 MHz-validating use in USB Full Speed (12 Mbit/s) and video timing paths.

What is the maximum operating voltage range for protected data lines?

The DALC208SC6 supports continuous signal voltages from V_REF1 to V_REF2. With REF1 = 0 V and REF2 = 5 V, the safe operating range is 0 V to 5 V DC. Exceeding this range risks forward conduction or reverse breakdown; the device does not regulate or shift signal levels-it only clamps transients outside this window.

How does DALC208SC6 differ from standard TVS diodes in ESD protection?

Unlike unidirectional or symmetric TVS diodes, DALC208SC6 uses dedicated REF1/REF2 pins to establish a programmable clamping window. This enables precise rail-to-rail suppression with lower dynamic impedance and significantly lower capacitance (<10 pF vs. >30 pF typical for TVS), making it suitable for high-speed interfaces where signal fidelity is critical.