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

onsemi KSD1588RTU

Name: KSD1588RTU
Brand: onsemi
SKU: KSD1588RTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSD1588RTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: KSD1588RTU.pdf

Description:: TRANS NPN 60V 7A TO-220F-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSD1588RTU from onsemi is an NPN epitaxial silicon power transistor designed for low-frequency power amplification and low-speed switching applications, with V_CEO = 60 V, I_C = 7 A (DC), P_C = 30 W at T_C = 25 °C, and h_FE ≥ 40 at I_C = 3 A - commonly used in audio output stages and relay drivers.

For engineers reviewing the KSD1588RTU datasheet, pinout, applications, or equivalent options, key selection considerations include safe operating area (SOA) compliance at 5 A/1 V, V_CE(sat) ≤ 0.5 V under I_C = 5 A / I_B = 0.5 A, thermal derating above 25 °C case temperature, and complementary pairing with KSB1097 for push-pull configurations.

Technical Context

This device operates as a medium-power bipolar junction transistor optimized for linear amplification and saturated switching in non-RF, low-dV/dt circuits. Its DC current gain (h_FE) is specified across two test points: ≥40 at I_C = 3 A and ≥20 at I_C = 5 A, supporting stable biasing in Class AB audio outputs.

The KSD1588RTU features a TO-220 Fullpack (Case 221AT) package with internal thermal resistance R_θJC enabling 30 W dissipation at T_C = 25 °C, and its SOA curve is defined for pulse widths up to 300 µs with ≤10% duty cycle - critical for motor drive snubber and solenoid control.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - maximum continuous collector-emitter voltage before breakdown; defines rail limit in amplifier or switch designs.
I_C (DC)	7 A - steady-state collector current handling; supports 15–20 W audio output into 4 Ω loads.
P_C @ T_C = 25 °C	30 W - usable power dissipation with heatsink; requires thermal interface design per R_θJA limits.
h_FE @ I_C = 3 A	40–200 - gain range per R/O/Y grade; R-grade (40–80) ensures predictable bias stability in fixed-gain stages.
V_CE(sat)	≤ 0.5 V @ I_C = 5 A, I_B = 0.5 A - low saturation loss enables >95% efficiency in switching mode below 10 kHz.
T_J max	150 °C - maximum junction temperature; sets upper bound for thermal design margin in enclosed enclosures.

Pinout & Package

Package: TO-220 Fullpack (Case 221AT), 3-lead, Pb-free, through-hole mount with integral heatsink tab (Collector-connected). Dimensions comply with Issue B mechanical outline dated 19 JAN 2021.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base drive current (max 3.5 A) to saturate or cut off the transistor; requires current-limiting resistor in fixed-bias designs.
2 (Collector)	Main power output terminal	Connected internally to metal tab; must be electrically isolated from heatsink unless circuit ground reference permits direct mounting.
3 (Emitter)	Current return path	Serves as common emitter node; low-impedance connection essential for minimizing parasitic inductance in high-current paths.

Key Features

Feature	Design Value
Complementary pair to KSB1097	Enables matched push-pull amplifier topologies without gain or V_BE mismatch penalties.
Low V_CE(sat) at high I_C	0.5 V max at 5 A reduces conduction loss and heat generation in relay/solenoid driver stages.
High I_C pulse rating	15 A peak (≤300 µs, ≤10% duty) supports short-duration surge loads like motor startup or lamp inrush.
TO-220 Fullpack thermal performance	30 W dissipation at T_C = 25 °C allows compact heatsinking in space-constrained industrial controls.

Applications

Audio Power Amplifier	DC Motor Driver
Use Scenario: Single-ended or push-pull output stage in 10–25 W audio amplifiers for public address or instrumentation. IC Role / Device Role / Timing Role: NPN power output transistor delivering current gain and voltage swing to 4–8 Ω loudspeakers. Use Value: h_FE ≥ 40 at 3 A ensures stable quiescent current setting; V_CE(sat) ≤ 0.5 V minimizes distortion at full output.	Use Scenario: H-bridge half-bridge leg or unidirectional PWM-controlled DC motor driver (up to 24 V, 5 A). IC Role / Device Role / Timing Role: Low-speed switching element controlling motor direction or speed via base-driven saturation. Use Value: 15 A pulse rating handles stall currents; SOA compliance prevents second-breakdown during PWM turn-off transients.
Relay/Solenoid Driver	Linear Voltage Regulator Pass Element
Use Scenario: Driving 12–24 V electromagnetic relays or solenoids requiring 500 mA–5 A coil current. IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to inductive load. Use Value: V_CEO = 60 V provides margin against flyback spikes; integrated base-emitter clamp not present, so external diode required.	Use Scenario: Series pass transistor in adjustable linear regulators delivering up to 5 A output current. IC Role / Device Role / Timing Role: Current-amplifying element controlled by error amplifier feedback loop. Use Value: 30 W thermal rating enables operation at 3–5 V dropout without forced air; h_FE consistency simplifies current mirror design.

Audio Power Amplifier

DC Motor Driver

Use Scenario: Single-ended or push-pull output stage in 10–25 W audio amplifiers for public address or instrumentation.

IC Role / Device Role / Timing Role: NPN power output transistor delivering current gain and voltage swing to 4–8 Ω loudspeakers.

Use Value: h_FE ≥ 40 at 3 A ensures stable quiescent current setting; V_CE(sat) ≤ 0.5 V minimizes distortion at full output.

Use Scenario: H-bridge half-bridge leg or unidirectional PWM-controlled DC motor driver (up to 24 V, 5 A).

IC Role / Device Role / Timing Role: Low-speed switching element controlling motor direction or speed via base-driven saturation.

Use Value: 15 A pulse rating handles stall currents; SOA compliance prevents second-breakdown during PWM turn-off transients.

Relay/Solenoid Driver

Linear Voltage Regulator Pass Element

Use Scenario: Driving 12–24 V electromagnetic relays or solenoids requiring 500 mA–5 A coil current.

IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to inductive load.

Use Value: V_CEO = 60 V provides margin against flyback spikes; integrated base-emitter clamp not present, so external diode required.

Use Scenario: Series pass transistor in adjustable linear regulators delivering up to 5 A output current.

IC Role / Device Role / Timing Role: Current-amplifying element controlled by error amplifier feedback loop.

Use Value: 30 W thermal rating enables operation at 3–5 V dropout without forced air; h_FE consistency simplifies current mirror design.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD122G	V_CEO = 100 V, I_C = 8 A, TO-263 package; higher voltage rating but surface-mount only.	Requires PCB rework for SMT assembly; unsuitable for through-hole legacy designs.	Select when board space is constrained and 100 V standoff is needed over 60 V.
2SC5200	V_CEO = 230 V, I_C = 15 A, TO-3P package; higher power but larger footprint and different pinout.	Used in high-fidelity audio amplifiers; incompatible pin assignment (B-C-E vs B-E-C).	Choose for high-voltage, high-power audio where thermal mass and SOA exceed KSD1588RTU capability.

Compared with MJD122G and 2SC5200, the KSD1588RTU offers optimal balance of through-hole compatibility, 60 V/7 A rating, and TO-220 thermal performance for cost-sensitive industrial controls - avoiding SMT conversion or oversized heatsinks.

Availability

KSD1588RTU is available at Aetrix Electronics and suitable for audio power amplifiers, DC motor drivers, relay/solenoid drivers, and linear voltage regulator pass elements requiring stable component supply and long-term industrial availability.

Supply support for KSD1588RTU 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 discrete devices.

The KSD1588RTU belongs to onsemi's general-purpose bipolar power transistor product line, engineered for robust low-frequency amplification and switching in industrial, automotive, and consumer equipment where reliability and thermal stability are critical.

FAQ

What is the pin configuration of the KSD1588RTU?

The KSD1588RTU uses a TO-220 Fullpack package with pin 1 = Base, pin 2 = Collector (connected to metal tab), and pin 3 = Emitter. This configuration is confirmed in the official onsemi mechanical drawing CASE 221AT and matches the marking diagram showing "D1588−Y" with lead numbering adjacent to the tab.

Is the KSD1588RTU RoHS compliant and lead-free?

Yes, the KSD1588RTU is explicitly marked as a Pb-Free Device in the onsemi datasheet (Publication Order Number KSD1588/D, Rev. 2), and its ordering information confirms "(Pb-Free)" for the KSD1588YTU variant - the RTU suffix denotes tape-and-reel packaging, consistent with onsemi's RoHS-compliant manufacturing standards.

What is the hFE grade for the KSD1588RTU?

The "R" in KSD1588RTU indicates the h_FE1 classification grade: 40–80 at V_CE = 1 V and I_C = 3 A. This is defined in the datasheet's h_FE1 Classification table, where R-grade devices are binned for moderate, predictable gain - ideal for stable biasing in linear amplifier stages using the KSD1588RTU.

Can the KSD1588RTU replace the KSD1588YTU in a design?

Yes - the KSD1588RTU and KSD1588YTU share identical electrical specifications, package (TO-220 Fullpack), and thermal ratings; only packaging differs (tape-and-reel vs. tube). The KSD1588RTU retains the same R-grade h_FE, V_CEO, I_C, and SOA characteristics, making it a direct form-fit-function replacement for automated assembly lines using the KSD1588RTU.

Does the KSD1588RTU require an external flyback diode when driving inductive loads?

Yes, the KSD1588RTU does not integrate a built-in base-emitter or collector-emitter clamp diode. When switching relays, solenoids, or motors, an external fast-recovery diode (e.g., 1N4007 or MUR series) must be placed across the inductive load to suppress flyback voltage spikes - otherwise, V_CEO stress may exceed 60 V and cause premature failure of the KSD1588RTU.

KSD1588RTU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 7 A

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 500mA, 5A

Current - Collector Cutoff (Max):: 10µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 3A, 1V

Power - Max:: 2 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220F-3

KSD1588RTU FAQ

1.How can I place an order for KSD1588RTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSD1588RTU 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 KSD1588RTU reliable?

The price and inventory of KSD1588RTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD1588RTU is usually 5 days.

3.What payment methods are accepted for KSD1588RTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD1588RTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSD1588RTU?

KSD1588RTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSD1588RTU 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 KSD1588RTU?

For technical support, including KSD1588RTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD1588RTU requirements.

6.How does Aetrix verify that KSD1588RTU is sourced from the original manufacturer or authorized distributors?

All KSD1588RTU 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 KSD1588RTU meets industry standards.

7.What is the process for return or replacement of KSD1588RTU?

All KSD1588RTU units undergo pre-shipment inspection (PSI). If there is an issue with KSD1588RTU, 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 KSD1588RTU part is unused and in its original packaging.

Return procedure for KSD1588RTU:

1.Submit a request within 90 days.

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

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