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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi CPH3245-TL-E

Name: CPH3245-TL-E
Brand: onsemi
SKU: CPH3245-TL-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CPH3245-TL-E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: CPH3245-TL-E.pdf

Description:: TRANS NPN 50V 2A 3-CPH

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Product details

Overview

CPH3245-TL-E from onsemi is a dual NPN bipolar junction transistor in an ultrasmall SC-59 (SOT-23) package, rated for −50 V V_CEO, −2 A I_C, and 0.9 W power dissipation at T_a = 25°C with ceramic substrate mounting. It delivers low V_CE(sat) of −130 mV (typ) at I_C = −1 A / I_B = −50 mA and supports high-speed switching with t_on = 35 ns and f_T = 420 MHz - used in compact relay and lamp driver circuits.

For engineers reviewing the CPH3245-TL-E datasheet, pinout, applications, or equivalent options, key selection factors include its PNP/NPN complementary pair configuration (with CPH3145), verified −50 V breakdown rating, 0.9 mm mounting height, and confirmed SOT-23 pin assignment (1=Base, 2=Emitter, 3=Collector) for space-constrained DC load switching designs.

Technical Context

The CPH3245-TL-E is an NPN transistor fabricated using onsemi's MBIT process, optimized for high-current switching with low saturation voltage and fast transient response. Its electrical behavior is characterized under defined test conditions: V_CE = −2 V, I_C = −100 mA for h_FE = 200–560; V_CE = −10 V, I_C = −300 mA for f_T = 420 MHz; and V_CB = −10 V, f = 1 MHz for C_ob = 8 pF (typ).

It operates as a discrete current amplifier/switch in grounded-emitter configuration, with validated thermal limits (T_j = 150°C max) and absolute ratings including V_(BR)CEO = −50 V, I_C = −2 A DC, and I_CP = −4 A pulsed - all specified at T_a = 25°C per JEDEC JESD78 compliance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V - maximum safe collector-to-emitter voltage before avalanche breakdown in open-base condition
I_C	−2 A - continuous DC collector current capability with derating above T_a = 25°C
V_CE(sat)	−130 mV (typ) at I_C = −1 A / I_B = −50 mA - enables <130 mW conduction loss per device in saturated switch mode
f_T	420 MHz - usable gain-bandwidth product for high-speed digital switching up to ~100 MHz edge rates
h_FE	200–560 at V_CE = −2 V, I_C = −100 mA - ensures reliable base drive margin for 10:1 to 20:1 current gain applications
t_on/t_f	35 ns / 40 ns - verified turn-on and fall times support ≤10 MHz PWM operation with minimal overlap loss
Package	SC-59 (SOT-23) - 3-pin surface-mount package with 0.9 mm max height, compatible with standard pick-and-place and reflow processes

Pinout & Package

CPH3245-TL-E uses the SC-59 (SOT-23) package with standardized 3-pin layout and 0.9 mm profile. Pin 1 is Base, Pin 2 is Emitter, Pin 3 is Collector - confirmed by onsemi's official marking diagram and mechanical drawing CASE 318BA.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input terminal; requires ≥50 mA base drive for full saturation at 1 A collector load
2	Emitter	Common reference node in grounded-emitter configuration; connected to system ground or low-side return path
3	Collector	High-current output terminal; switches loads up to −2 A DC between collector and V_CC rail

Key Features

Feature	Design Value
Ultrasmall SC-59 package	0.9 mm max mounting height enables use in ultra-thin consumer and portable electronics where board space is constrained
Low V_CE(sat)	−130 mV (typ) reduces conduction losses and self-heating during sustained on-state operation
High f_T	420 MHz bandwidth supports clean switching edges in motor control and LED flash timing circuits
High allowable power dissipation	0.9 W on 600 mm² × 0.8 mm ceramic substrate allows >1 W pulsed operation with proper thermal design
Complementary pairing	Designed for matched operation with CPH3145 (PNP) to form push-pull or H-bridge driver stages

Applications

Relay Drivers	Lamp Drivers
Use Scenario: Driving electromagnetic relays in industrial PLC I/O modules requiring fast coil energization/de-energization. IC Role / Device Role / Timing Role: NPN switch controlling relay coil current up to 2 A with <40 ns fall time to minimize contact arcing. Use Value: Low V_CE(sat) reduces coil power loss; high h_FE simplifies base drive circuitry and lowers MCU GPIO current demand.	Use Scenario: Switching incandescent or halogen indicator lamps in automotive dashboards and appliance panels. IC Role / Device Role / Timing Role: High-current NPN switch enabling direct lamp connection without external MOSFET buffering. Use Value: −50 V V_CEO withstands automotive load-dump transients; 0.9 mm profile fits behind thin front-panel overlays.
Motor Drivers	Flash Circuits
Use Scenario: Low-voltage DC motor commutation in battery-powered toys and small actuators (e.g., 12 V brushed motors). IC Role / Device Role / Timing Role: Single-ended switch in half-bridge topology, handling peak stall currents up to −4 A pulse-rated. Use Value: Verified t_stg = 330 ns and t_f = 40 ns limit shoot-through risk; high I_C rating avoids need for paralleling devices.	Use Scenario: Triggering xenon flash tubes in compact digital cameras and medical imaging equipment. IC Role / Device Role / Timing Role: Fast-switching NPN transistor discharging high-voltage capacitor through flash tube primary winding. Use Value: 420 MHz f_T ensures rapid turn-off after flash pulse; −50 V V_(BR)CBO accommodates >40 V trigger voltages.

Relay Drivers

Lamp Drivers

Use Scenario: Driving electromagnetic relays in industrial PLC I/O modules requiring fast coil energization/de-energization.

IC Role / Device Role / Timing Role: NPN switch controlling relay coil current up to 2 A with <40 ns fall time to minimize contact arcing.

Use Value: Low V_CE(sat) reduces coil power loss; high h_FE simplifies base drive circuitry and lowers MCU GPIO current demand.

Use Scenario: Switching incandescent or halogen indicator lamps in automotive dashboards and appliance panels.

IC Role / Device Role / Timing Role: High-current NPN switch enabling direct lamp connection without external MOSFET buffering.

Use Value: −50 V V_CEO withstands automotive load-dump transients; 0.9 mm profile fits behind thin front-panel overlays.

Motor Drivers

Flash Circuits

Use Scenario: Low-voltage DC motor commutation in battery-powered toys and small actuators (e.g., 12 V brushed motors).

IC Role / Device Role / Timing Role: Single-ended switch in half-bridge topology, handling peak stall currents up to −4 A pulse-rated.

Use Value: Verified t_stg = 330 ns and t_f = 40 ns limit shoot-through risk; high I_C rating avoids need for paralleling devices.

Use Scenario: Triggering xenon flash tubes in compact digital cameras and medical imaging equipment.

IC Role / Device Role / Timing Role: Fast-switching NPN transistor discharging high-voltage capacitor through flash tube primary winding.

Use Value: 420 MHz f_T ensures rapid turn-off after flash pulse; −50 V V_(BR)CBO accommodates >40 V trigger voltages.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT4401LT1G	V_CEO = 40 V (vs. −50 V); I_C = −600 mA (vs. −2 A); V_CE(sat) = −750 mV @ I_C = −150 mA	Lower voltage/current rating limits use in 24–48 V industrial loads and high-current lamp drivers	Select when lower cost and 40 V systems suffice; not suitable for −50 V or >1 A applications
ZTX653	V_CEO = −60 V; I_C = −2 A; but TO-92 package (4.5 mm height) vs. SOT-23 (0.9 mm)	Same electrical rating but incompatible footprint; requires PCB redesign and higher assembly cost	Choose only if legacy TO-92 compatibility is mandatory and height constraint is relaxed

Compared with MMBT4401LT1G and ZTX653, the CPH3245-TL-E uniquely combines −50 V rating, −2 A current, and 0.9 mm SOT-23 profile - making it optimal for space-limited, medium-voltage switching where both performance and miniaturization are critical.

Availability

CPH3245-TL-E is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, motor drivers, and flash circuits requiring stable component supply across industrial, automotive, and consumer production programs.

Supply support for CPH3245-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 manufacturer specializing in energy-efficient power, analog, sensor, and logic solutions for automotive, industrial, cloud, and IoT applications.

The CPH3245-TL-E belongs to onsemi's general-purpose bipolar transistor product line, engineered for high-current, high-speed switching in compact surface-mount packages - targeting miniaturized power interface and load control designs.

FAQ

What is the pin configuration of the CPH3245-TL-E?

The CPH3245-TL-E uses a standard SC-59 (SOT-23) package with Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector - confirmed by onsemi's official mechanical drawing CASE 318BA and marking diagram on page 1 of the CPH3145_CPH3245/D datasheet. This pinout is consistent across all TL-E tape-and-reel variants.

Does the CPH3245-TL-E support complementary operation with a PNP device?

Yes, the CPH3245-TL-E is explicitly designed as the NPN complement to the CPH3145-TL-E (PNP), sharing identical SC-59 packaging, voltage ratings (−50 V V_CEO), and thermal specifications. Their matched parameters enable balanced push-pull and H-bridge configurations without layout asymmetry.

What is the maximum power dissipation for the CPH3245-TL-E under standard mounting conditions?

The CPH3245-TL-E has a maximum power dissipation of 0.9 W when mounted on a 600 mm² × 0.8 mm ceramic substrate at T_a = 25°C. Derating is required above 25°C ambient, with junction temperature limited to 150°C - verified per onsemi's absolute maximum ratings table on page 1 of the datasheet.

Can the CPH3245-TL-E be used in 24 V automotive applications?

Yes, the CPH3245-TL-E supports 24 V automotive applications due to its −50 V V_(BR)CEO rating, which exceeds typical 24 V system load-dump transients (up to +40 V). Its −2 A I_C rating and low V_CE(sat) also ensure robust operation in solenoid, lamp, and small-motor control nodes.

Is the CPH3245-TL-E RoHS-compliant and lead-free?

Yes, the CPH3245-TL-E is Pb-Free and RoHS-compliant, as stated in the ordering information table on page 5 of the CPH3145_CPH3245/D datasheet, which specifies "SC-59, SOT-23, TO-236 (Pb-Free)" for the CPH3245-TL-E variant.

CPH3245-TL-E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 2 A

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 260mV @ 50mA, 1A

Current - Collector Cutoff (Max):: 1µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 100mA, 2V

Power - Max:: 900 mW

Frequency - Transition:: 420MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 3-CPH

CPH3245-TL-E FAQ

1.How can I place an order for CPH3245-TL-E through Aetrix?

Please submit a Request for Quotation (RFQ) for CPH3245-TL-E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CPH3245-TL-E reliable?

The price and inventory of CPH3245-TL-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CPH3245-TL-E is usually 5 days.

3.What payment methods are accepted for CPH3245-TL-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CPH3245-TL-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CPH3245-TL-E?

CPH3245-TL-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CPH3245-TL-E order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CPH3245-TL-E?

For technical support, including CPH3245-TL-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CPH3245-TL-E requirements.

6.How does Aetrix verify that CPH3245-TL-E is sourced from the original manufacturer or authorized distributors?

All CPH3245-TL-E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CPH3245-TL-E meets industry standards.

7.What is the process for return or replacement of CPH3245-TL-E?

All CPH3245-TL-E units undergo pre-shipment inspection (PSI). If there is an issue with CPH3245-TL-E, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CPH3245-TL-E part is unused and in its original packaging.

Return procedure for CPH3245-TL-E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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