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

onsemi 2SD1145F-AE

Name: 2SD1145F-AE
Brand: onsemi
SKU: 2SD1145F-AE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SD1145F-AE

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body

Datasheet:: 2SD1145F-AE.pdf

Description:: TRANS NPN 20V 5A 3-MP

Quantity:: RFQ Add To RFQ list

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Inventory:15,000

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Product details

Overview

2SD1145F-AE from SANYO is an NPN epitaxial planar silicon transistor designed for high-current switching in relay, lamp, and motor driver circuits. It delivers 5 A collector current, 60 V collector-emitter breakdown voltage, 0.5 V saturation voltage at IC = 3 A / IB = 60 mA, 900 mW power dissipation, and operates across –55°C to +150°C junction temperature range.

For engineers reviewing the 2SD1145F-AE datasheet, pinout, applications, or equivalent options, key selection criteria include its low V_CE(sat), wide safe operating area (ASO), pulse-rated 8 A peak current capability, and suitability for DC-DC converter switching stages and solenoid/hammer drivers requiring robust thermal margin.

Technical Context

This discrete NPN bipolar junction transistor uses epitaxial planar construction for stable gain and low saturation voltage. Its h_FE is binned (F-grade: 100–200 at V_CE = 2 V, I_C = 0.5 A) and supports pulsed operation up to 8 A with 100 ms duty cycle.

The device exhibits f_T = 120 MHz at V_CE = 10 V, I_C = 50 mA, enabling use in medium-speed switching applications. Output capacitance C_ob is 54 pF at V_CB = 10 V, f = 1 MHz, supporting predictable turn-off behavior in inductive load circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum collector-emitter voltage before breakdown under open-base condition; sets upper limit for inductive flyback energy handling.
I_C	5 A - Continuous DC collector current rating; defines steady-state drive capability for relays, lamps, or small motors.
V_CE(sat)	0.5 V @ I_C = 3 A, I_B = 60 mA - Low saturation voltage minimizes conduction loss and heat generation in high-duty-cycle switching.
P_C	900 mW - Maximum power dissipation at T_a = 25°C; requires heatsinking above ~1.5 A continuous operation.
f_T	120 MHz - Gain-bandwidth product confirms suitability for switching frequencies up to ~1–2 MHz with adequate gain margin.
C_ob	54 pF @ V_CB = 10 V - Output capacitance impacts turn-off speed and EMI in hard-switched topologies.
T_j max	+150°C - Maximum junction temperature enables operation in high-ambient industrial environments without derating below 125°C ambient.

Pinout & Package

2SD1145F-AE is housed in a TO-126 (MP) plastic package with 3 leads: emitter (pin 1), collector (pin 2), base (pin 3). The collector tab is electrically connected to pin 2 and serves as primary thermal path.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit node	Connected to ground or low-side return; must handle full load current and support low-impedance emitter degeneration if used.
2 (Collector)	Current entry node	Connected to load supply rail; tab provides mechanical mounting and thermal conduction to heatsink.
3 (Base)	Control input	Receives current-limited drive signal; requires ≥60 mA for full saturation at 3 A load; sensitive to ESD.

Key Features

Feature	Design Value
Low V_CE(sat)	0.5 V at 3 A ensures <1.5 W conduction loss, reducing heatsink requirements in 24 V relay driver designs.
Wide ASO	Rated for 5 A DC and 8 A pulse (100 ms) at V_CE ≤ 20 V, enabling reliable operation under transient overloads in motor start-up.
High h_FE binning	F-grade (100–200) guarantees minimum current gain for consistent base drive sizing across production lots.
Robust thermal rating	Junction-to-ambient θ_JA ≈ 139°C/W (TO-126, no heatsink); allows direct PCB mounting in space-constrained industrial controls.

Applications

Relay Driver	Lamp Driver
Use Scenario: Driving 24 V, 1 A coil relays in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: High-current NPN switch sinking relay coil current to ground on command. Use Value: 0.5 V V_CE(sat) limits power loss to 0.5 W per relay, enabling dense packaging without forced air cooling.	Use Scenario: Switching incandescent indicator lamps (12 V, 500 mA) in automotive dashboards. IC Role / Device Role / Timing Role: Low-side switch controlling lamp current path during ignition and warning states. Use Value: F-grade h_FE ensures reliable turn-on with microcontroller GPIO drive, eliminating need for external base resistors in many cases.
DC-DC Converter	Motor Driver
Use Scenario: Low-side switch in non-synchronous buck converter (12 V input, 5 V/2 A output) for embedded power rails. IC Role / Device Role / Timing Role: Pulse-width modulated (PWM) switching element controlling energy transfer to output inductor. Use Value: 120 MHz f_T supports clean switching at 500 kHz PWM with minimal gain roll-off, improving regulation accuracy.	Use Scenario: H-bridge half-bridge leg driving 24 V, 3 A brushed DC motors in factory automation actuators. IC Role / Device Role / Timing Role: One quadrant of bidirectional current control, sinking motor current during active decay. Use Value: Wide ASO accommodates back-EMF spikes up to 40 V during motor commutation without secondary clamping.

Relay Driver

Lamp Driver

Use Scenario: Driving 24 V, 1 A coil relays in programmable logic controllers (PLCs).

IC Role / Device Role / Timing Role: High-current NPN switch sinking relay coil current to ground on command.

Use Value: 0.5 V V_CE(sat) limits power loss to 0.5 W per relay, enabling dense packaging without forced air cooling.

Use Scenario: Switching incandescent indicator lamps (12 V, 500 mA) in automotive dashboards.

IC Role / Device Role / Timing Role: Low-side switch controlling lamp current path during ignition and warning states.

Use Value: F-grade h_FE ensures reliable turn-on with microcontroller GPIO drive, eliminating need for external base resistors in many cases.

DC-DC Converter

Motor Driver

Use Scenario: Low-side switch in non-synchronous buck converter (12 V input, 5 V/2 A output) for embedded power rails.

IC Role / Device Role / Timing Role: Pulse-width modulated (PWM) switching element controlling energy transfer to output inductor.

Use Value: 120 MHz f_T supports clean switching at 500 kHz PWM with minimal gain roll-off, improving regulation accuracy.

Use Scenario: H-bridge half-bridge leg driving 24 V, 3 A brushed DC motors in factory automation actuators.

IC Role / Device Role / Timing Role: One quadrant of bidirectional current control, sinking motor current during active decay.

Use Value: Wide ASO accommodates back-EMF spikes up to 40 V during motor commutation without secondary clamping.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN high-current switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SD1047	Higher V_CEO = 100 V, lower h_FE (60–120), same TO-126 package.	Better suited for higher-voltage flyback protection in solenoid drivers; less gain margin for marginal base drive.	Select when V_CE transients exceed 60 V but base drive current is ample.
MJD127G	Same V_CEO = 60 V, higher P_C = 1.5 W, h_FE = 1000 min, TO-220 package.	Superior thermal performance and gain stability; larger footprint and higher cost.	Choose for high-reliability industrial motor drives where heatsinking is available and gain consistency is critical.

Compared with 2SD1145F-AE, 2SD1047 trades gain for voltage headroom while maintaining identical form factor, whereas MJD127G offers significantly higher gain and power handling in a larger TO-220 package-making it preferable for thermally demanding, low-base-drive applications despite increased board area.

Availability

2SD1145F-AE is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, and DC-DC converter switching stages requiring stable component supply and long-term industrial availability.

Supply support for 2SD1145F-AE 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

SANYO Electric Co., Ltd. was a Japanese semiconductor manufacturer known for high-performance analog and power devices before its acquisition by Panasonic in 2012.

The 2SD1145F-AE belongs to SANYO's legacy general-purpose power transistor family, engineered specifically for industrial and automotive auxiliary load switching where reliability, thermal robustness, and predictable saturation behavior are prioritized over ultra-high speed.

FAQ

What is the maximum continuous collector current rating for the 2SD1145F-AE?

The 2SD1145F-AE has a maximum continuous collector current (I_C) rating of 5 A at T_a = 25°C. Derating is required above 25°C ambient; at 75°C, the usable I_C drops to approximately 3.5 A. This rating assumes proper PCB copper area or heatsinking to maintain junction temperature ≤150°C. The 2SD1145F-AE is also rated for 8 A pulsed (100 ms) under specified conditions.

Does the 2SD1145F-AE have a built-in base-emitter resistor?

No, the 2SD1145F-AE is a standard three-terminal NPN bipolar transistor without any integrated base-emitter resistor. External base drive circuitry-including current-limiting resistors and optional pull-down resistors-must be provided by the designer. This gives full control over switching speed and saturation depth but requires careful base current calculation to ensure full turn-on at the target load current.

What is the typical DC current gain (h_FE) of the 2SD1145F-AE at 0.5 A collector current?

The 2SD1145F-AE is binned by h_FE; the "F" suffix denotes a guaranteed range of 100–200 at V_CE = 2 V and I_C = 0.5 A. At I_C = 3 A, h_FE typically falls to 60–100. Designers should use the minimum value (100) for worst-case base drive sizing in the 2SD1145F-AE to ensure saturation across process and temperature variation.

Can the 2SD1145F-AE be used in a linear regulator application?

The 2SD1145F-AE is not optimized for linear regulation due to its relatively high V_CE(sat) and limited SOA in the linear region. While it can operate in the active region, its Safe Operating Area (SOA) curve shows significant derating above V_CE > 10 V at high currents. For linear regulators, dedicated pass transistors with wider SOA and lower saturation voltage-such as the 2N3055 or MJ15003-are more appropriate than the 2SD1145F-AE.

Is the collector tab of the 2SD1145F-AE electrically isolated?

No, the collector tab of the 2SD1145F-AE is electrically connected to pin 2 (collector). It is not insulated and must be mounted to a heatsink using an electrically isolating pad or washer if the heatsink is grounded or referenced to another potential. Failure to isolate may cause short circuits in the application circuit. Always verify isolation requirements before mechanical mounting of the 2SD1145F-AE.

2SD1145F-AE Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 20 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 60mA, 3A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 160 @ 500mA, 2V

Power - Max:: 900 mW

Frequency - Transition:: 120MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-MP

2SD1145F-AE FAQ

1.How can I place an order for 2SD1145F-AE through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SD1145F-AE 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 2SD1145F-AE reliable?

The price and inventory of 2SD1145F-AE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SD1145F-AE is usually 5 days.

3.What payment methods are accepted for 2SD1145F-AE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SD1145F-AE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SD1145F-AE?

2SD1145F-AE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SD1145F-AE 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 2SD1145F-AE?

For technical support, including 2SD1145F-AE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SD1145F-AE requirements.

6.How does Aetrix verify that 2SD1145F-AE is sourced from the original manufacturer or authorized distributors?

All 2SD1145F-AE 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 2SD1145F-AE meets industry standards.

7.What is the process for return or replacement of 2SD1145F-AE?

All 2SD1145F-AE units undergo pre-shipment inspection (PSI). If there is an issue with 2SD1145F-AE, 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 2SD1145F-AE part is unused and in its original packaging.

Return procedure for 2SD1145F-AE:

1.Submit a request within 90 days.

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

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