onsemi CM1242-07CP

Overview

CM1242-07CP from onsemi is a single-channel ultra-small 0201 WLCSP ESD protection device with <5.8 pF input capacitance, ±17 kV IEC 61000-4-2 contact/air discharge rating, and ±5.0 V standoff voltage, deployed in high-density mobile interface lines such as USB 2.0 and HDMI.

For engineers reviewing the CM1242-07CP datasheet, pinout, applications, or equivalent options, key selection criteria include low clamping voltage (+9.8 V / −9.8 V at 1 A), dynamic resistance <1.5 Ω, and 0.60 mm × 0.30 mm footprint for space-constrained PCB layouts.

Technical Context

The CM1242-07CP implements bidirectional TVS-based ESD suppression in a 2-bump WLCSP2 package, with symmetrical breakdown voltage (±6.0 to ±9.0 V) and leakage current ≤±100 nA at ±5.0 V. It operates across −40 °C to +85 °C and supports peak pulse currents per IEC 61000-4-2 Level 4.

Its TLP-derived IV characteristics show sharp turn-on behavior and stable clamping under 8/20 µs surge transients. The device exhibits minimal insertion loss (<−0.5 dB up to 1 GHz), confirming suitability for high-speed signal paths without signal integrity degradation.

Key Specifications

Pinout & Package

CM1242-07CP uses a 2-bump WLCSP2 (Case 567AV) package with bottom-solder bumps. The device has no leads; electrical connection is made via two solder bumps labeled A and B on the underside.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD1E05U06DPYR and ESD5Z3.3T5G, the CM1242-07CP delivers superior ESD robustness (±17 kV) in the smallest available footprint, making it optimal for next-generation mobile interfaces where board space and system-level immunity are critical constraints.

Availability

CM1242-07CP is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI signal line safeguarding, and MIPI D-PHY data lane ESD suppression requiring stable component supply and consistent tape-and-reel delivery.

Supply support for CM1242-07CP 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 mobile markets.

The CM1242-07CP belongs to onsemi's ultra-miniature ESD protection portfolio, designed specifically for high-speed, space-constrained mobile interfaces where traditional discrete TVS devices fail to meet size or capacitance targets.

FAQ

What is the maximum operating temperature range for the CM1242-07CP?

The CM1242-07CP is rated for continuous operation from −40 °C to +85 °C. This range supports deployment in consumer handheld devices, including smartphones and tablets, where ambient and self-heating conditions remain within these bounds. The device's thermal stability is validated per JEDEC JESD22-A104 reliability testing, and its WLCSP2 package provides efficient heat dissipation through solder joints to the PCB.

Does the CM1242-07CP require external biasing or control signals?

No, the CM1242-07CP is a passive bidirectional TVS diode and requires no external biasing, power supply, or control signals. It functions automatically upon detection of overvoltage transients, clamping when voltage exceeds ±6.0 V breakdown threshold. Its zero-bias operation makes integration seamless into signal paths such as USB D+ and D− lines without altering existing circuit topology or power architecture.

How does the CM1242-07CP compare to standard SOD-323 ESD protectors in terms of PCB area?

The CM1242-07CP occupies only 0.18 mm² (0.60 mm × 0.30 mm), less than 15% of the 1.2 mm × 0.8 mm (0.96 mm²) area of a typical SOD-323 ESD protector. This reduction enables placement directly at high-speed connector pads without trace stubs, minimizing parasitic inductance and preserving signal fidelity - a critical advantage in USB 2.0 and MIPI D-PHY designs where layout real estate is severely constrained.

Is the CM1242-07CP compatible with lead-free reflow soldering processes?

Yes, the CM1242-07CP features a pure tin finish and is qualified for standard Pb-free reflow profiles, including JEDEC J-STD-020D-compliant peak temperatures up to 260 °C. Its WLCSP2 package is designed for reliable solder joint formation using SnAgCu paste, and the device's mechanical specifications (including bump coplanarity and thermal expansion match to FR-4) ensure high first-pass yield in automated SMT assembly lines.

Can the CM1242-07CP be used for protecting 5 V logic lines?

Yes, the CM1242-07CP has a ±5.0 V standoff voltage and ±6.0 to ±9.0 V breakdown range, making it suitable for protecting 5 V tolerant I/O lines. Its low leakage (<±100 nA at ±5.0 V) prevents DC loading, and its ±17 kV ESD rating exceeds system-level requirements for industrial and consumer equipment. However, verify that the downstream IC's absolute maximum ratings accommodate the +9.8 V / −9.8 V clamping voltage under worst-case 1 A transients.