onsemi CPH3122-TL-E

Overview

CPH3122-TL-E from onsemi is a PNP bipolar junction transistor rated for −30 V V_CEO, −3 A I_C, and −120 mV typical V_CE(sat) at I_C = −1.5 A / I_B = −75 mA, optimized for high-current switching in relay and motor driver circuits.

For engineers reviewing the CPH3122-TL-E datasheet, pinout, applications, or equivalent options, key selection criteria include low saturation voltage, 400 MHz f_T, SC-59 (CPH3) package compatibility, and −3 A continuous current capability in compact surface-mount designs.

Technical Context

This PNP transistor employs MBIT process technology to achieve high-speed switching (t_on = 50 ns, t_f = 27 ns) and stable DC current gain (h_FE = 200–560 at V_CE = −2 V, I_C = −500 mA), with robust thermal performance up to 150 °C junction temperature.

It operates within recommended conditions of V_CE ≤ −30 V, I_C ≤ −3 A, and ambient temperatures from −55 °C to +150 °C, delivering low output capacitance (C_ob = 25 pF at V_CB = −10 V) and high allowable power dissipation (0.9 W on 600 mm² ceramic substrate).

Key Specifications

Pinout & Package

CPH3122-TL-E is housed in the ultrasmall CPH3 package (JEITA/JEDEC SC-59, TO-236, SOT-23), measuring 2.9 × 1.6 × 0.9 mm with 0.95 mm lead pitch and 0.013 g mass. Mounting height is 0.9 mm, enabling ultra-thin PCB integration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP transistor switching applications.

Compared with MMBT3906LT1G and PN2907A, CPH3122-TL-E delivers 15× higher continuous current, sub-200 mV saturation voltage, and 10× faster switching-making it uniquely suited for compact, high-efficiency relay, lamp, and motor drivers requiring surface-mount scalability.

Availability

CPH3122-TL-E is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, and motor drivers requiring stable component supply, RoHS-compliant packaging, and high-volume tape-and-reel logistics (3,000 pcs./reel).

Supply support for CPH3122-TL-E 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 electronics, delivering power management, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.

CPH3122-TL-E belongs to onsemi's CPH series of high-performance PNP transistors, engineered specifically for miniaturized, high-current switching applications where low V_CE(sat), fast response, and SC-59 package compatibility are essential.

FAQ

What is the maximum continuous collector current for CPH3122-TL-E?

The CPH3122-TL-E supports a maximum continuous collector current of −3 A at T_a = 25 °C when mounted on a 600 mm² ceramic substrate. Derating applies above 25 °C ambient; the device maintains −1.5 A capability at 75 °C per the PC–Ta curve in the datasheet. This rating enables direct drive of medium-power loads without external heat sinking in most industrial PCB layouts.

Does CPH3122-TL-E have a built-in thermal pad or exposed metal tab?

No, CPH3122-TL-E does not feature a thermal pad or exposed collector tab. Its CPH3 package uses standard copper leadframe construction with plastic molding; thermal transfer occurs solely through the leads and PCB copper. For optimal thermal performance, use wide copper pours connected to pins 2 (Emitter) and 3 (Collector), and follow the land pattern example provided in the official outline drawing (Ordering No. EN7220B).

What is the typical V_CE(sat) of CPH3122-TL-E at I_C = −1.5 A?

The typical V_CE(sat) of CPH3122-TL-E is −120 mV at I_C = −1.5 A and I_B = −75 mA (I_C/I_B = 20), and −180 mV at I_C = −1.5 A and I_B = −30 mA (I_C/I_B = 50). These values are measured at T_a = 25 °C and confirm its suitability for low-loss switching in high-current driver stages.

Is CPH3122-TL-E compatible with lead-free reflow soldering processes?

Yes, CPH3122-TL-E is Pb-free and qualified for standard lead-free reflow soldering per J-STD-020. Its moisture sensitivity level (MSL) is 1, meaning it can be stored indefinitely at <30 °C/60% RH without baking. Peak reflow temperature must not exceed 260 °C, and the device meets JEDEC specifications for thermal cycling and intermetallic reliability in automated SMT lines.

Can CPH3122-TL-E replace a generic SOT-23 PNP transistor in existing designs?

CPH3122-TL-E uses the SC-59 (SOT-23) footprint and shares pinout (1=Base, 2=Emitter, 3=Collector) with industry-standard SOT-23 packages, but its −3 A rating and −120 mV V_CE(sat) exceed most general-purpose SOT-23 PNP transistors. Verify layout clearance, thermal relief, and drive strength before drop-in replacement-especially if substituting for lower-current devices like MMBT3906.