onsemi CPH3240-TL-E

Overview

CPH3240-TL-E from onsemi is an NPN bipolar junction transistor in a CPH3 (SOT-23) package, rated for −100 V V_CEO, 1 A I_C, and low 0.1–0.4 V V_CE(sat) at I_C = −400 mA / I_B = −40 mA. It delivers 120 MHz f_T, 140–400 h_FE, and 8.5 pF C_ob, optimized for high-speed switching in compact power control circuits.

For engineers reviewing the CPH3240-TL-E datasheet, pinout, applications, or equivalent options, key selection criteria include its NPN polarity, SOT-23 footprint compatibility, −100 V breakdown rating, low saturation voltage under 400 mA load, and 120 MHz gain-bandwidth performance in space-constrained DC-DC and motor drive stages.

Technical Context

The CPH3240-TL-E is a discrete NPN BJT fabricated using onsemi's MBIT process, supporting high-voltage operation up to −100 V V_CEO and pulsed current up to −2 A. Its design emphasizes fast switching with 80 ns turn-on, 850 ns storage, and 50 ns fall time, enabling efficient use in PWM-controlled loads.

Thermal performance is specified for mounting on a 600 mm² × 0.8 mm ceramic substrate, delivering 0.9 W P_C at T_a = 25°C. Junction temperature is rated to 150°C, with storage range from −55°C to +150°C - suitable for industrial ambient conditions without derating below 75°C.

Key Specifications

Pinout & Package

CPH3240-TL-E uses the CPH3 package - identical to JEITA SC-59 / JEDEC TO-236 / industry-standard SOT-23 - with 3-pin surface-mount configuration and Pb-free TL taping (3,000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT3904LT1G and ZTX653, the CPH3240-TL-E uniquely balances −100 V ruggedness, 1 A current handling, sub-0.4 V saturation, and SOT-23 miniaturization - making it optimal for space-limited industrial switching where both voltage margin and efficiency matter.

Availability

CPH3240-TL-E is available at Aetrix Electronics and suitable for industrial relay drivers, DC-DC converter switching, and small-motor H-bridge legs requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for CPH3240-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, with leadership in power management, analog, sensors, and connectivity solutions.

The CPH3240-TL-E belongs to onsemi's CPH series of high-voltage, high-speed bipolar transistors designed specifically for compact, high-reliability switching in industrial automation, power conversion, and motor control applications.

FAQ

What is the polarity and transistor type of CPH3240-TL-E?

The CPH3240-TL-E is an NPN bipolar junction transistor. Its part number suffix and electrical characteristics - including positive V_CE test conditions, negative current ratings, and matching curve families in the datasheet - confirm NPN configuration. This distinguishes it from the PNP CPH3140-TL-E in the same CPH3 package family. The CPH3240-TL-E operates as a current-controlled switch with base-emitter forward bias enabling collector-emitter conduction.

What is the maximum continuous collector current rating for CPH3240-TL-E?

The CPH3240-TL-E has a maximum continuous collector current (I_C) rating of −1 A at T_a = 25°C when mounted on a 600 mm² × 0.8 mm ceramic substrate. This rating assumes proper PCB thermal relief and is derated above 25°C ambient per the PC–Ta curve in the datasheet. Pulse current (I_CP) reaches −2 A for short durations, but sustained operation above −1 A requires thermal analysis and layout optimization.

Does CPH3240-TL-E have Pb-free construction and RoHS compliance?

Yes, the CPH3240-TL-E is Pb-free and RoHS-compliant, as explicitly stated in the "Ordering Information" table and "Embossed Taping Specification" section of the official datasheet. The "-E" suffix denotes Pb-free termination, and the device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for reflow soldering. Aetrix Electronics supplies only RoHS-compliant, fully traceable CPH3240-TL-E reels meeting IPC-J-STD-609 classification.

What is the typical gain-bandwidth product (f_T) of CPH3240-TL-E and how is it measured?

CPH3240-TL-E has a typical gain-bandwidth product (f_T) of 120 MHz, measured at V_CE = 10 V and I_C = −100 mA under small-signal AC conditions. This parameter reflects the frequency at which the transistor's short-circuit current gain drops to unity and directly informs usable switching frequency limits in amplifier or high-speed switch applications. The datasheet confirms this value applies specifically to CPH3240, not the CPH3140 variant.

Can CPH3240-TL-E be used as a direct replacement for MMBT3904 in existing SOT-23 designs?

CPH3240-TL-E shares the SOT-23 (CPH3) footprint and pinout (1=Base, 2=Emitter, 3=Collector) with MMBT3904, but it is not a direct functional replacement due to higher V_CEO (−100 V vs. 40 V) and higher V_CE(sat) (0.1–0.4 V vs. ~0.2 V typical). While mechanically compatible, circuit validation is required for voltage margin, base drive strength, and thermal performance - especially in 24 V+ systems where MMBT3904 would be overstressed. The CPH3240-TL-E offers enhanced ruggedness, not drop-in equivalence.