onsemi CM1241-04D4

Overview

CM1241-04D4 from onsemi is a 4-channel low-capacitance dual-voltage ESD protection array in an 8-lead WDFN package, featuring three 1.5 pF low-voltage I/O channels (Pins 1–3) rated for ±8 kV contact discharge and one high-voltage channel (Pin 4) with 53 pF input capacitance and ±15 kV contact discharge capability, deployed in USB 2.0 data line and industrial sensor interface protection.

For engineers reviewing the CM1241-04D4 datasheet, pinout, applications, or equivalent options, key selection criteria include low-voltage channel clamp voltage (+9.64 V / –1.75 V at 1 A), dynamic resistance (0.72 Ω positive / 0.59 Ω negative for LV channels), HV breakdown voltage (14.6–17.7 V), leakage current (<100 nA at 3.3 V), and thermal stability of capacitance across –40°C to +85°C.

Technical Context

The CM1241-04D4 integrates three identical low-voltage Zener-based ESD clamps (CH1–CH3) with matched input capacitance (1.2–1.5 pF) and one dedicated high-voltage rail clamp (VCC) using a higher-breakdown Zener structure. Each LV channel exhibits <0.02 pF capacitance mismatch and minimal voltage/temperature drift.

It employs a monolithic silicon design with shared VN (negative supply rail) connection across Pins 6–8 and die-attach pad (DAP) tied to GND. The architecture eliminates need for external bypass capacitors by integrating low-leakage (<1 µA) internal bias paths and robust 1000-strike ESD endurance per IEC61000-4-2 Level 4.

Key Specifications

Pinout & Package

CM1241-04D4 uses an 8-lead WDFN package (Case 511BF), 1.7 mm × 1.35 mm × 0.8 mm, with exposed die-attach pad (DAP) electrically connected to GND. Pin 1 marked with microdot; pins down orientation in tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD2E001DRYR and SP3222-04UTG, the CM1241-04D4 uniquely delivers integrated dual-voltage protection (±8 kV LV + ±15 kV HV) in a compact 1.7×1.35 mm WDFN-8, eliminating discrete count and enabling single-component safeguarding of both signal and supply rails.

Availability

CM1241-04D4 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial sensor signal conditioning, and automotive body control modules requiring stable component supply and guaranteed long-term manufacturability.

Supply support for CM1241-04D4 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, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The CM1241-04D4 belongs to onsemi's ESD protection portfolio designed specifically for high-density, high-speed interface protection where low capacitance, multi-channel integration, and dual-voltage rail coverage are critical.

FAQ

What is the maximum operating voltage for the low-voltage channels of the CM1241-04D4?

The CM1241-04D4 low-voltage channels (Pins 1–3) have a maximum DC voltage rating of 6.0 V, verified per Absolute Maximum Ratings table. This allows safe operation on 3.3 V and 5 V logic buses without risk of forward conduction or parametric shift. The CM1241-04D4 maintains stable leakage (<100 nA) and capacitance (1.2–1.5 pF) within this range across –40°C to +85°C.

Does the CM1241-04D4 require external decoupling capacitors on its VCC pin?

No, the CM1241-04D4 does not require external bypass capacitors on Pin 4 (VCC). Its internal architecture integrates low-leakage bias circuitry and a high-voltage Zener diode that stabilizes the clamp threshold without external components. This feature reduces bill-of-materials count and PCB area versus legacy arrays requiring discrete 100 nF ceramics, as confirmed in the Features section of the CM1241-04D4 datasheet.

How many ESD strikes can the CM1241-04D4 withstand on its low-voltage pins?

The CM1241-04D4 is validated to withstand over 1000 ±8 kV contact discharge ESD strikes on Pins 1–3 under IEC61000-4-2 Level 4 test conditions - 1000 pulses at 1-second intervals in a continuous run. Post-test verification confirms all electrical parameters remain within specification, confirming robustness for high-reliability industrial deployments. This endurance applies specifically to the CM1241-04D4 and is not extrapolated from family-level data.

What is the function of Pins 6, 7, and 8 on the CM1241-04D4?

Pins 6, 7, and 8 of the CM1241-04D4 are all designated VN (Negative Voltage Supply Rail) and form a low-impedance common cathode node for the three low-voltage ESD clamps (CH1–CH3). They must be connected to the system's negative reference - typically GND or a negative rail - to complete the clamping path. This triple-terminal configuration lowers inductance and improves transient response versus single-pin alternatives, as detailed in the Pin Descriptions table of the CM1241-04D4 datasheet.

Is the CM1241-04D4 compatible with lead-free reflow soldering processes?

Yes, the CM1241-04D4 is Pb-free and RoHS compliant, with a matte tin lead finish qualified for standard lead-free reflow profiles per J-STD-020. Its WDFN-8 package (Case 511BF) has a maximum peak temperature rating of 260°C, and the device undergoes full qualification including thermal cycling and moisture sensitivity level (MSL) 1 testing. This ensures reliable solder joint formation without voiding or delamination during CM1241-04D4 assembly.