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

onsemi MCH3145-TL-E

Name: MCH3145-TL-E
Brand: onsemi
SKU: MCH3145-TL-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCH3145-TL-E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: MCH3145-TL-E.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MCH3145-TL-E from onsemi is a PNP bipolar junction transistor in MCPH3 (SC-70/SOT-323) package, rated for −50 V V_CEO, −2 A I_C, and 0.8 W power dissipation at T_a = 25°C on ceramic substrate. It delivers low V_CE(sat) of −165 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 MCH3145-TL-E datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, −50 V breakdown rating, ultrasmall 0.85 mm mounting height, and confirmed h_FE range of 200–560 at V_CE = −2 V / I_C = −100 mA.

Technical Context

The MCH3145-TL-E is a discrete PNP BJT optimized for medium-current switching in space-constrained applications. Its design emphasizes low saturation voltage (−165 to −330 mV), high DC current gain (h_FE = 200–560), and fast switching performance (t_on = 35 ns, t_f = 24 ns).

It operates within a junction temperature range of −55°C to +150°C and is characterized for reliable performance under pulsed conditions (I_CP = −4 A) and continuous DC bias. The device uses onsemi's MBIT process and is qualified for industrial ambient operation up to +75°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V - Maximum safe collector-emitter voltage before breakdown in open-base configuration.
I_C	−2 A - Continuous collector current rating defining maximum steady-state load drive capability.
V_CE(sat)	−165 mV (typ) at I_C = −1 A / I_B = −50 mA - Enables low conduction loss in saturated switch applications.
f_T	420 MHz - Gain-bandwidth product confirming suitability for high-frequency switching up to ~100 MHz practical use.
h_FE	200–560 at V_CE = −2 V / I_C = −100 mA - Ensures stable base drive requirements across production lots and temperature.
P_C	0.8 W on 600 mm² ceramic substrate - Defines thermal derating envelope for PCB-level power handling.
t_on/t_f	35 ns / 24 ns - Confirmed turn-on and fall times enabling sub-100 ns switching cycles in digital logic interfaces.

Pinout & Package

Package: MCPH3 (JEITA SC-70 / JEDEC SOT-323), ultrasmall surface-mount plastic package with 0.85 mm max mounting height and 0.65 mm pin pitch.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to saturate.
2	Emitter	Current source terminal in PNP configuration; connected to higher potential rail in typical high-side switch layouts.
3	Collector	Current sink terminal; connects to load return path; polarity-sensitive for correct biasing in circuit schematics.

Key Features

Feature	Design Value
Low V_CE(sat)	−165 mV typ at I_C = −1 A enables <170 mW conduction loss per switch, reducing thermal load in dense PCB layouts.
Ultrasmall footprint	MCPH3 package (2.1 × 1.6 × 0.85 mm) allows placement in <2.5 mm² board area, supporting miniaturized relay drivers and LED arrays.
High-speed switching	35 ns turn-on and 24 ns fall time support PWM frequencies >5 MHz in precision timing control loops.
Robust thermal rating	150°C max junction temperature and 0.8 W dissipation on ceramic substrate ensure reliability in sealed industrial enclosures.

Applications

Relay Driver Circuit	Lamp Driver Module
Use Scenario: Driving electromagnetic relays in programmable logic controllers where space and thermal budget are constrained. IC Role / Device Role / Timing Role: PNP switch controlling relay coil current with fast turn-off to prevent contact arcing. Use Value: Low V_CE(sat) reduces coil heating; high h_FE minimizes base drive current, easing microcontroller GPIO loading.	Use Scenario: Switching incandescent or halogen indicator lamps in automotive dashboards and industrial HMI panels. IC Role / Device Role / Timing Role: High-current PNP switch enabling direct lamp connection to battery rail with controlled inrush limiting. Use Value: −2 A rating handles cold-filament surge; 420 MHz f_T ensures clean PWM dimming without audible noise.
Motor Driver Stage	Flash LED Power Switch
Use Scenario: Low-side or high-side current control for small DC motors (<5 W) in portable medical devices and robotics. IC Role / Device Role / Timing Role: Discrete PNP switch in H-bridge half-bridge stage or direction-controlled enable path. Use Value: −50 V V_CEO accommodates back-EMF spikes; 0.85 mm height avoids interference with adjacent motor driver ICs.	Use Scenario: High-current pulse switching for camera flash LEDs in compact consumer electronics. IC Role / Device Role / Timing Role: Fast-saturating PNP switch delivering 2 A peak pulses with minimal delay and overshoot. Use Value: 35 ns t_on synchronizes precisely with image sensor exposure timing; low Cob (8 pF) prevents signal coupling into analog sensor paths.

Relay Driver Circuit

Lamp Driver Module

Use Scenario: Driving electromagnetic relays in programmable logic controllers where space and thermal budget are constrained.

IC Role / Device Role / Timing Role: PNP switch controlling relay coil current with fast turn-off to prevent contact arcing.

Use Value: Low V_CE(sat) reduces coil heating; high h_FE minimizes base drive current, easing microcontroller GPIO loading.

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

IC Role / Device Role / Timing Role: High-current PNP switch enabling direct lamp connection to battery rail with controlled inrush limiting.

Use Value: −2 A rating handles cold-filament surge; 420 MHz f_T ensures clean PWM dimming without audible noise.

Motor Driver Stage

Flash LED Power Switch

Use Scenario: Low-side or high-side current control for small DC motors (<5 W) in portable medical devices and robotics.

IC Role / Device Role / Timing Role: Discrete PNP switch in H-bridge half-bridge stage or direction-controlled enable path.

Use Value: −50 V V_CEO accommodates back-EMF spikes; 0.85 mm height avoids interference with adjacent motor driver ICs.

Use Scenario: High-current pulse switching for camera flash LEDs in compact consumer electronics.

IC Role / Device Role / Timing Role: Fast-saturating PNP switch delivering 2 A peak pulses with minimal delay and overshoot.

Use Value: 35 ns t_on synchronizes precisely with image sensor exposure timing; low Cob (8 pF) prevents signal coupling into analog sensor paths.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MBT3906DW1T1G	Same MCPH3 package, but −40 V V_CEO, −200 mA I_C, lower f_T (250 MHz), and higher V_CE(sat) (−400 mV min).	Not suitable for −50 V systems or >500 mA loads; limited to low-power signal switching.	Select only when voltage/current stress is below 80% of MCH3145-TL-E ratings and speed is non-critical.
DXT3906-7-F	SOT-323 package, −40 V V_CEO, −200 mA I_C, −300 mV V_CE(sat) (typ), h_FE 100–300.	Lower power handling and gain; lacks pulsed current rating (I_CP = −4 A) and thermal robustness.	Acceptable for cost-sensitive, low-duty-cycle indicator applications where full MCH3145-TL-E performance is unused.

Compared with MBT3906DW1T1G and DXT3906-7-F, the MCH3145-TL-E provides 25% higher voltage margin, 10× higher continuous current, and 68% faster switching - making it the only option among the three qualified for industrial relay and flash LED pulse loads requiring −50 V/−2 A operation.

Availability

MCH3145-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 consistent parametric performance across production batches.

Supply support for MCH3145-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 specializing in energy-efficient power and signal management solutions, with leadership in automotive, industrial, and cloud power systems.

The MCH3145-TL-E belongs to onsemi's discrete bipolar transistor family engineered for high-reliability, space-constrained switching applications - emphasizing low saturation voltage, fast response, and thermal resilience in industrial control modules.

FAQ

What is the polarity and transistor type of the MCH3145-TL-E?

The MCH3145-TL-E is a PNP bipolar junction transistor. Its polarity is confirmed by negative voltage and current ratings throughout the datasheet: V_CEO = −50 V, I_C = −2 A, and V_CE(sat) = −165 mV (typ). This defines emitter as the most positive terminal in normal operation, with base driven negative relative to emitter to achieve saturation. The MCH3145-TL-E is not an NPN or MOSFET device.

What package does the MCH3145-TL-E use, and is it compatible with standard SOT-323 footprints?

The MCH3145-TL-E uses the MCPH3 package, which is mechanically identical to JEDEC SOT-323 and JEITA SC-70. Its dimensions (2.1 × 1.6 × 0.85 mm) and 0.65 mm pin pitch match industry-standard SOT-323 land patterns. The MCH3145-TL-E can be placed using standard SOT-323 reflow profiles and stencil apertures without modification.

Does the MCH3145-TL-E support pulsed operation, and what is its peak current rating?

Yes, the MCH3145-TL-E supports pulsed operation with I_CP = −4 A (collector current pulse) at duty cycle ≤1% and pulse width ≤10 μs. This rating is validated per the switching time test circuit in the datasheet and enables short-duration high-current loads such as flash LED bursts or relay coil energization without thermal runaway. The MCH3145-TL-E maintains safe junction temperature under these conditions when mounted per spec.

What is the guaranteed DC current gain (h_FE) range for the MCH3145-TL-E at room temperature?

The MCH3145-TL-E has a guaranteed h_FE range of 200 to 560 when measured at V_CE = −2 V and I_C = −100 mA, at T_a = 25°C. This range is specified in the Electrical Characteristics table and applies to every unit shipped. The MCH3145-TL-E does not have a minimum h_FE below 200 or maximum above 560 under those exact test conditions.

Is the MCH3145-TL-E lead-free and RoHS compliant?

Yes, the MCH3145-TL-E is lead-free and RoHS compliant, as explicitly stated in the Ordering Information section: "MCH3145-TL-E … Pb Free". The "TL" in the part number denotes tape-and-reel packaging, and the "-E" suffix confirms RoHS-compliant finish. The MCH3145-TL-E meets EU Directive 2011/65/EU and is suitable for environmentally regulated end equipment.

MCH3145-TL-E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SC-70, SOT-323

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:: 800 mW

Frequency - Transition:: 420MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 3-MCPH

MCH3145-TL-E FAQ

1.How can I place an order for MCH3145-TL-E through Aetrix?

Please submit a Request for Quotation (RFQ) for MCH3145-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 MCH3145-TL-E reliable?

The price and inventory of MCH3145-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 MCH3145-TL-E is usually 5 days.

3.What payment methods are accepted for MCH3145-TL-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCH3145-TL-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MCH3145-TL-E?

MCH3145-TL-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCH3145-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 MCH3145-TL-E?

For technical support, including MCH3145-TL-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCH3145-TL-E requirements.

6.How does Aetrix verify that MCH3145-TL-E is sourced from the original manufacturer or authorized distributors?

All MCH3145-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 MCH3145-TL-E meets industry standards.

7.What is the process for return or replacement of MCH3145-TL-E?

All MCH3145-TL-E units undergo pre-shipment inspection (PSI). If there is an issue with MCH3145-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 MCH3145-TL-E part is unused and in its original packaging.

Return procedure for MCH3145-TL-E:

1.Submit a request within 90 days.

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

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