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

onsemi CPH3145-TL-E

Name: CPH3145-TL-E
Brand: onsemi
SKU: CPH3145-TL-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CPH3145-TL-E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: CPH3145-TL-E.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

CPH3145-TL-E from onsemi is a PNP bipolar junction transistor in SC-59 (SOT-23) package, rated for −50 V V_CEO, −2 A I_C, with V_CE(sat) = −130 mV at I_C = −1 A / I_B = −50 mA, f_T = 420 MHz, and ultralow mounting height of 0.9 mm - used in compact relay and lamp driver stages.

For engineers reviewing the CPH3145-TL-E datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP switching performance, low saturation voltage under pulsed load, thermal dissipation on ceramic substrate, and compatibility with high-density SMT layouts requiring sub-1 mm profile.

Technical Context

This device operates as a medium-power PNP switch optimized for fast turn-on/turn-off (t_on = 35 ns, t_f = 24 ns) with high DC current gain (h_FE = 200–560 at −100 mA) and robust breakdown ratings (V_(BR)CEO = −50 V, V_(BR)CBO = −50 V). It uses onsemi's MBIT process to achieve low V_CE(sat) and high allowable power dissipation (P_C = 0.9 W on 600 mm² ceramic).

The CPH3145-TL-E shares pinout and footprint with its NPN counterpart CPH3245-TL-E but differs in polarity, biasing, and saturation behavior - enabling complementary pair use in H-bridge or push-pull output stages without layout redesign.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V - supports reliable blocking in 24 V industrial control rails with 2× safety margin
I_C (DC)	−2 A - delivers sufficient drive current for small solenoids, LED arrays, or logic-level relay coils
V_CE(sat)	−130 mV max at −1 A / −50 mA - minimizes conduction loss and self-heating in continuous switching
f_T	420 MHz - enables stable operation up to ~100 MHz square-wave switching with controlled edge rates
t_on/t_f	35 ns / 24 ns - reduces transition losses and EMI in PWM-driven loads like motor commutation
P_C	0.9 W on 600 mm² ceramic - allows sustained operation without heatsink in space-constrained PCBs
Mounting height	0.9 mm - fits beneath low-profile shields or stacked modules in wearables and IoT sensors

Pinout & Package

CPH3145-TL-E is housed in SC-59 (SOT-23, TO-236) package with Pb-free finish, marked "BE", and specified for tape-and-reel delivery (3,000 pcs/reel). Dimensions: 2.4 mm × 1.4 mm × 0.9 mm (L × W × H), recommended solder footprint per Case 318BA.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires −50 mA base drive for full saturation at −1 A collector load
2	Emitter	Common reference terminal for PNP operation; connected to positive rail in high-side switch configuration
3	Collector	Output current sink; connects to load cathode (e.g., relay coil or LED anode) in typical switching topology

Key Features

Feature	Design Value
Ultrasmall profile (0.9 mm height)	Enables integration into ultra-thin consumer electronics and portable medical devices where Z-axis clearance is constrained
Low V_CE(sat) (−130 mV)	Reduces power loss by >40% vs. standard PNP transistors at 1 A, lowering thermal stress on adjacent components
High f_T (420 MHz)	Supports clean digital switching up to 50 MHz without parasitic oscillation or ringing in gate-drive applications
MBIT process technology	Delivers tighter h_FE distribution (200–560) and improved consistency across production lots for automated assembly
0.9 W power dissipation	Permits continuous DC operation at −1.5 A with <10°C junction rise on minimal ceramic substrate - no thermal via required

Applications

Relay Driver Stage	Lamp Driver Circuit
Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules with microcontroller GPIO. IC Role / Device Role / Timing Role: High-side PNP switch controlling relay coil current path to ground. Use Value: Low V_CE(sat) ensures <150 mW coil-side loss at 1 A, preventing thermal derating and extending relay contact life.	Use Scenario: Switching incandescent or halogen indicator lamps in automotive dashboards. IC Role / Device Role / Timing Role: Constant-current sink for lamp filament with fast turn-off to suppress inrush-induced voltage spikes. Use Value: 24 ns fall time limits inductive kick amplitude, reducing need for external snubbers or TVS diodes.
Motor Commutation Stage	Flash LED Power Control
Use Scenario: Half-bridge upper-leg switch in brushed DC motor drivers for robotics and power tools. IC Role / Device Role / Timing Role: Synchronized PNP switch paired with NPN CPH3245-TL-E for bidirectional current control. Use Value: Matched pinout and timing (t_on/t_f) enable precise dead-time management without layout asymmetry.	Use Scenario: High-current pulse driver for camera flash LEDs in mobile devices. IC Role / Device Role / Timing Role: Fast-switching current source delivering 2 A pulses with <35 ns turn-on delay. Use Value: 420 MHz f_T maintains gain stability during 10–100 μs flash bursts, avoiding brightness droop.

Relay Driver Stage

Lamp Driver Circuit

Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules with microcontroller GPIO.

IC Role / Device Role / Timing Role: High-side PNP switch controlling relay coil current path to ground.

Use Value: Low V_CE(sat) ensures <150 mW coil-side loss at 1 A, preventing thermal derating and extending relay contact life.

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

IC Role / Device Role / Timing Role: Constant-current sink for lamp filament with fast turn-off to suppress inrush-induced voltage spikes.

Use Value: 24 ns fall time limits inductive kick amplitude, reducing need for external snubbers or TVS diodes.

Motor Commutation Stage

Flash LED Power Control

Use Scenario: Half-bridge upper-leg switch in brushed DC motor drivers for robotics and power tools.

IC Role / Device Role / Timing Role: Synchronized PNP switch paired with NPN CPH3245-TL-E for bidirectional current control.

Use Value: Matched pinout and timing (t_on/t_f) enable precise dead-time management without layout asymmetry.

Use Scenario: High-current pulse driver for camera flash LEDs in mobile devices.

IC Role / Device Role / Timing Role: Fast-switching current source delivering 2 A pulses with <35 ns turn-on delay.

Use Value: 420 MHz f_T maintains gain stability during 10–100 μs flash bursts, avoiding brightness droop.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3906LT1G	V_CEO = −40 V, I_C = −200 mA, V_CE(sat) = −300 mV @ −50 mA - lower voltage rating and higher saturation loss	Not suitable for 24 V relay loads or >500 mA lamp drivers due to derating and thermal limits	Select only for low-voltage (<12 V), low-current (<150 mA) signal-level switching where cost is primary
BC807-40,215	V_CEO = −45 V, I_C = −500 mA, V_CE(sat) = −700 mV @ −100 mA - significantly higher conduction loss and lower current capability	Requires larger PCB area and heatsinking for same load; unsuitable for flash or motor pulse duty	Consider only when legacy design reuse mandates SOT-23-3 footprint with relaxed performance targets

Compared with MMBT3906LT1G and BC807-40,215, the CPH3145-TL-E delivers 2× higher current, 3× lower V_CE(sat), and 5× greater f_T, making it uniquely suited for miniaturized, high-efficiency PNP switching in space- and thermally constrained applications.

Availability

CPH3145-TL-E is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, motor commutation stages, and flash LED power control requiring stable component supply and consistent parametric performance across production batches.

Supply support for CPH3145-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 innovation for automotive, industrial, cloud, and IoT applications.

The CPH3145-TL-E belongs to onsemi's low-voltage, high-speed bipolar transistor family designed specifically for miniaturized switching circuits where low profile, low saturation voltage, and fast transient response are critical.

FAQ

What is the maximum continuous collector current for CPH3145-TL-E?

The CPH3145-TL-E is rated for −2 A continuous collector current (I_C) at T_a = 25°C when mounted on a 600 mm² ceramic substrate. Derating applies above 25°C ambient; at 100°C case temperature, maximum usable I_C drops to approximately −1.2 A per the thermal resistance curve in the official datasheet.

Is CPH3145-TL-E pin-compatible with CPH3245-TL-E?

Yes - CPH3145-TL-E and CPH3245-TL-E share identical SC-59 (SOT-23) pinout (Base–Emitter–Collector), marking orientation, and mechanical footprint. However, CPH3145-TL-E is PNP while CPH3245-TL-E is NPN, so biasing and circuit topology must be inverted when substituting.

Does CPH3145-TL-E support pulse operation beyond its DC rating?

Yes - CPH3145-TL-E supports −4 A pulsed collector current (I_CP) with duty cycle ≤1% and pulse width ≤20 μs. This enables short-duration flash or motor-start surge handling without exceeding junction temperature limits, provided thermal mass and PCB copper area meet onsemi's recommended layout guidelines.

What is the guaranteed minimum h_FE for CPH3145-TL-E at −100 mA?

The guaranteed minimum DC current gain (h_FE) for CPH3145-TL-E is 200 at V_CE = −2 V and I_C = −100 mA, per the Electrical Characteristics table in the official datasheet. Typical values reach 560, supporting robust drive margin in production designs.

Can CPH3145-TL-E be used in automotive applications?

CPH3145-TL-E meets AEC-Q101 stress test requirements for discrete semiconductors and is qualified for automotive underhood and cabin applications. Its 150°C junction rating, −55°C to +150°C storage range, and Pb-free SC-59 package make it suitable for engine control modules, lighting controllers, and body electronics where reliability and thermal resilience are essential.

CPH3145-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:: PNP

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

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

Vce Saturation (Max) @ Ib, Ic:: 330mV @ 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

CPH3145-TL-E FAQ

1.How can I place an order for CPH3145-TL-E through Aetrix?

Please submit a Request for Quotation (RFQ) for CPH3145-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 CPH3145-TL-E reliable?

The price and inventory of CPH3145-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 CPH3145-TL-E is usually 5 days.

3.What payment methods are accepted for CPH3145-TL-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CPH3145-TL-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CPH3145-TL-E?

CPH3145-TL-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CPH3145-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 CPH3145-TL-E?

For technical support, including CPH3145-TL-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CPH3145-TL-E requirements.

6.How does Aetrix verify that CPH3145-TL-E is sourced from the original manufacturer or authorized distributors?

All CPH3145-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 CPH3145-TL-E meets industry standards.

7.What is the process for return or replacement of CPH3145-TL-E?

All CPH3145-TL-E units undergo pre-shipment inspection (PSI). If there is an issue with CPH3145-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 CPH3145-TL-E part is unused and in its original packaging.

Return procedure for CPH3145-TL-E:

1.Submit a request within 90 days.

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

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