onsemi CM1244-04CP

Overview

CM1244-04CP from onsemi is a 4-channel ESD protection array in a 5-bump WLCSP (0.76 mm × 1.053 mm, 0.4 mm pitch) with ±15 kV IEC 61000−4−2 contact discharge and ±30 kV HBM ESD rating, 22–32 pF diode capacitance at 2.5 V, and 5.5 V reverse breakdown voltage - deployed for I/O port and keypad protection in wireless handsets and portable electronics.

For engineers reviewing the CM1244-04CP datasheet, pinout, applications, or equivalent options, key selection criteria include low-capacitance signal-line protection, chip-scale footprint compatibility with high-density portable PCBs, ground-referenced clamping architecture, and OptiGuard-coated reliability for reflow-soldered assemblies.

Technical Context

The CM1244-04CP integrates four independent bidirectional ESD protection diodes in a monolithic silicon die, each connected between an I/O line and common GND. It operates within –40°C to +85°C and supports signal voltages up to ±9.0 V clamping during transients while maintaining ≤100 nA leakage at 3.3 V.

Its WLCSP-5 package uses solder bumps for direct die-to-PCB interconnect, minimizing parasitic inductance (<0.3 nH typical) to preserve high-frequency ESD response. The OptiGuard coating enhances moisture resistance and mitigates intermetallic growth during thermal cycling.

Key Specifications

Pinout & Package

CM1244-04CP uses a 5-bump Wafer-Level Chip Scale Package (WLCSP5, Case 567AX), measuring 0.760 mm × 1.053 mm with 0.4 mm pitch and coplanar solder bumps. The package features OptiGuard coating for enhanced assembly reliability and Pb-free compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD4E001DRYR and ESD5451N-2/TR, the CM1244-04CP delivers the smallest footprint and highest IEC-rated ESD immunity among 4-channel CSP arrays, making it optimal for next-generation ultra-thin mobile devices where both space and robustness are constrained.

Availability

CM1244-04CP is available at Aetrix Electronics and suitable for wireless handsets, MP3 players, digital camcorders, and notebooks requiring stable component supply with guaranteed long-term manufacturability.

Supply support for CM1244-04CP 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and portable electronics.

The CM1244-04CP belongs to onsemi's OptiGuard ESD protection product line, engineered specifically for ultra-compact, high-reliability transient suppression in consumer portable devices with stringent size and performance requirements.

FAQ

What is the maximum operating temperature range for the CM1244-04CP?

The CM1244-04CP is rated for continuous operation from –40°C to +85°C, matching standard industrial temperature requirements for portable electronics. This range is validated across all electrical parameters including leakage current, clamping voltage, and ESD withstand capability - no derating is required within these limits. The WLCSP package's thermal performance supports this range without additional heatsinking.

Does the CM1244-04CP require external biasing or control signals?

No, the CM1244-04CP is a passive, unidirectional ESD protection device that requires no external power, bias, or control signals. Its four internal diodes conduct only during overvoltage transients, returning to high-impedance state (<100 nA leakage) under normal 3.3 V or 5 V signal conditions. This simplifies integration into existing signal paths without modifying host IC firmware or layout.

Can the CM1244-04CP be used for EMI filtering in addition to ESD protection?

Yes - the CM1244-04CP can contribute to EMI suppression when paired with external series resistance (e.g., 10–100 Ω) to form an RC low-pass filter, as noted in its official application guidance. Its 22–32 pF capacitance provides predictable high-frequency roll-off above ~100 MHz, but it must not be relied upon as a standalone EMI filter; system-level filtering still requires dedicated ferrites or capacitors.

What does the "CP" suffix indicate in CM1244-04CP?

The "CP" suffix in CM1244-04CP denotes a Pb-free, RoHS-compliant Chip Scale Package (WLCSP5) with OptiGuard coating. It distinguishes this variant from legacy leaded versions and confirms compliance with JEDEC J-STD-020 moisture sensitivity level (MSL) 1 - allowing unlimited floor life and standard reflow profiles without baking.

How is the ground connection implemented in the CM1244-04CP pinout?

The CM1244-04CP uses Pin B2 as the sole GND terminal - a dedicated, centrally located solder bump that must be connected to a low-impedance system ground plane. All four ESD channels share this common return path, so proper grounding is critical for clamping effectiveness; split or high-impedance ground traces will degrade ESD performance and increase clamping voltage.