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

onsemi KSD1588YTU

Name: KSD1588YTU
Brand: onsemi
SKU: KSD1588YTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSD1588YTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: KSD1588YTU.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSD1588YTU 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 - used in audio output stages and relay drivers.

For engineers reviewing the KSD1588YTU datasheet, pinout, applications, or equivalent options, key selection considerations include safe operating area (SOA) derating above 25 °C, V_CE(sat) ≤ 0.5 V at I_C = 5 A / I_B = 0.5 A, h_FE grade Y (100–200), and TO-220 Fullpack thermal interface requirements.

Technical Context

This device operates as a linear-mode NPN bipolar junction transistor optimized for Class AB audio amplifiers and industrial control switching. Its SOA is defined up to 100 V and 15 A (pulse), with thermal derating beginning at T_C > 25 °C per Figure 5 and Figure 6.

It features complementary pairing with KSB1097 (PNP), supports DC bias networks requiring stable h_FE across 3–5 A collector current, and requires external base current limiting due to absence of integrated protection circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - maximum continuous collector-emitter voltage before breakdown; sets rail limit in amplifier output stage design
I_C (DC)	7 A - steady-state collector current handling; determines heatsink sizing for continuous conduction
P_C (T_C = 25 °C)	30 W - case-referenced power dissipation; defines thermal interface requirement with heatsink
h_FE (I_C = 3 A)	100–200 (Grade Y) - current gain range used for base drive calculation accuracy in linear operation
V_CE(sat)	≤ 0.5 V at I_C = 5 A / I_B = 0.5 A - saturation voltage directly impacts conduction loss and thermal rise in switching mode
T_J max	150 °C - absolute junction temperature limit; constrains maximum allowable thermal resistance R_θJC + R_θCS + R_θSA

Pinout & Package

Package: TO-220 Fullpack (Case 221AT), 3-lead, Pb-free, through-hole mount with insulated tab. Thermal pad electrically connected to collector.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Current-controlled input terminal	Receives base drive current to enable controlled collector current flow; requires series resistor for current limiting
2 (Collector)	Main high-current output terminal	Connected to heatsink via insulated tab; carries full load current and dissipates majority of heat
3 (Emitter)	Reference terminal for base-emitter junction	Typically grounded or tied to low-side return path; establishes emitter-follower or common-emitter topology

Key Features

Feature	Design Value
Complementary PNP pair	Designed for matched operation with KSB1097 in push-pull amplifier stages
High DC current gain (h_FE)	Grade Y ensures h_FE ≥ 100 at I_C = 3 A, reducing required base drive power
Low V_CE(sat)	≤ 0.5 V enables <1 W conduction loss at 5 A, improving efficiency in linear/switching modes
Robust SOA	Rated for 100 V × 15 A pulse (PW ≤ 300 µs, duty ≤ 10%) - supports transient overload tolerance

Applications

Audio Power Amplifier	DC Motor Driver
Use Scenario: Final output stage in 10–20 W Class AB audio amplifiers driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: NPN power transistor in emitter-follower configuration delivering peak current >5 A into reactive load. Use Value: Low V_CE(sat) minimizes crossover distortion and thermal drift; h_FE consistency ensures stable bias point over temperature.	Use Scenario: Low-speed H-bridge half-bridge leg controlling 12–24 V brushed DC motors in industrial actuators. IC Role / Device Role / Timing Role: High-current switch turning motor winding on/off at ≤1 kHz PWM frequency. Use Value: 30 W case dissipation and SOA compliance allow sustained 7 A DC motor stall current without secondary breakdown.
Relay Driver	Power Supply Pass Transistor
Use Scenario: Driving high-coil-resistance relays (e.g., 12 V / 100 mA) in PLC I/O modules. IC Role / Device Role / Timing Role: Saturated switch providing >5× coil current gain to reduce microcontroller GPIO loading. Use Value: V_CEO = 60 V accommodates back-EMF suppression clamping; fast turn-on/turn-off reduces contact arcing.	Use Scenario: Series pass element in linear regulated power supplies delivering up to 5 A at 5–15 V output. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential. Use Value: 150 °C T_J max and 30 W P_C support continuous operation under worst-case dropout (e.g., 24 V in → 5 V out @ 5 A).

Audio Power Amplifier

DC Motor Driver

Use Scenario: Final output stage in 10–20 W Class AB audio amplifiers driving 4–8 Ω speakers.

IC Role / Device Role / Timing Role: NPN power transistor in emitter-follower configuration delivering peak current >5 A into reactive load.

Use Value: Low V_CE(sat) minimizes crossover distortion and thermal drift; h_FE consistency ensures stable bias point over temperature.

Use Scenario: Low-speed H-bridge half-bridge leg controlling 12–24 V brushed DC motors in industrial actuators.

IC Role / Device Role / Timing Role: High-current switch turning motor winding on/off at ≤1 kHz PWM frequency.

Use Value: 30 W case dissipation and SOA compliance allow sustained 7 A DC motor stall current without secondary breakdown.

Relay Driver

Power Supply Pass Transistor

Use Scenario: Driving high-coil-resistance relays (e.g., 12 V / 100 mA) in PLC I/O modules.

IC Role / Device Role / Timing Role: Saturated switch providing >5× coil current gain to reduce microcontroller GPIO loading.

Use Value: V_CEO = 60 V accommodates back-EMF suppression clamping; fast turn-on/turn-off reduces contact arcing.

Use Scenario: Series pass element in linear regulated power supplies delivering up to 5 A at 5–15 V output.

IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential.

Use Value: 150 °C T_J max and 30 W P_C support continuous operation under worst-case dropout (e.g., 24 V in → 5 V out @ 5 A).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127G	TO-263 package, higher V_CEO (80 V), lower h_FE (20–100), same I_C rating	Suitable for surface-mount designs; less gain stability at high I_C	Prefer when board space is constrained and thermal interface allows D_PAK mounting
2SC5200	Higher P_C (150 W), larger TO-3P package, V_CEO = 230 V, h_FE = 80–160	Used in high-power audio amplifiers (>50 W); over-specified for 20 W applications	Select only when system-level SOA or voltage margin exceeds KSD1588YTU capability

Compared with MJD127G and 2SC5200, the KSD1588YTU offers optimal balance of TO-220 thermal performance, Grade Y h_FE consistency, and cost-effective through-hole assembly - making it preferred for mid-power linear and switching roles where footprint and gain predictability are critical.

Availability

KSD1588YTU is available at Aetrix Electronics and suitable for audio amplifiers, DC motor controllers, relay drivers, and linear power supplies requiring stable component supply and long-term industrial availability.

Supply support for KSD1588YTU 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, serving automotive, industrial, cloud, and IoT markets with discrete, analog, and logic solutions.

The KSD1588YTU belongs to onsemi's legacy power bipolar transistor family, engineered specifically for robust low-frequency amplification and switching in cost-sensitive industrial and consumer power systems.

FAQ

What is the pin configuration of the KSD1588YTU?

The KSD1588YTU uses a standard TO-220 Fullpack 3-lead configuration: Pin 1 is Base, Pin 2 is Collector (connected to the metal tab), and Pin 3 is Emitter. This layout is confirmed in the official onsemi mechanical drawing CASE 221AT and applies identically across all KSD1588 variants including KSD1588YTU.

Is the KSD1588YTU RoHS compliant and lead-free?

Yes, the KSD1588YTU is explicitly marked as a Pb-Free device in the onsemi datasheet (Rev. 2, January 2026), meeting RoHS Directive 2011/65/EU requirements. The "TU" suffix denotes tape-and-reel packaging with Pb-free termination, and the device carries no lead content in solderable surfaces or internal construction.

What does the "Y" in KSD1588YTU indicate?

Within the KSD1588YTU marking, the "Y" denotes the h_FE gain grade per onsemi's classification table: h_FE1 = 100–200 at V_CE = 1 V and I_C = 3 A. This grade ensures predictable base drive requirements and consistent linearity in amplifier bias networks - a verified specification for every KSD1588YTU unit.

Can the KSD1588YTU be used in parallel configurations?

The KSD1588YTU can be operated in parallel only with careful attention to emitter ballasting resistors and matched h_FE grading (e.g., same "Y" bin). Its positive temperature coefficient of V_BE provides inherent current-sharing stability, but datasheet Figure 2 shows h_FE variation across temperature - thus external balancing is required for reliable multi-device operation in the KSD1588YTU design.

Does the KSD1588YTU have built-in protection features like thermal shutdown or overcurrent limiting?

No, the KSD1588YTU is a discrete bipolar transistor with no integrated protection circuitry. It relies entirely on external design measures - such as base current limiting, heatsinking, SOA-aware biasing, and external fusing - to prevent secondary breakdown or thermal runaway. This behavior is consistent across all KSD1588 variants, including the KSD1588YTU.

KSD1588YTU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tube

Product Status:: Active

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:: 100 @ 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

KSD1588YTU FAQ

1.How can I place an order for KSD1588YTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSD1588YTU 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 KSD1588YTU reliable?

The price and inventory of KSD1588YTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD1588YTU is usually 5 days.

3.What payment methods are accepted for KSD1588YTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD1588YTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSD1588YTU?

KSD1588YTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSD1588YTU 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 KSD1588YTU?

For technical support, including KSD1588YTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD1588YTU requirements.

6.How does Aetrix verify that KSD1588YTU is sourced from the original manufacturer or authorized distributors?

All KSD1588YTU 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 KSD1588YTU meets industry standards.

7.What is the process for return or replacement of KSD1588YTU?

All KSD1588YTU units undergo pre-shipment inspection (PSI). If there is an issue with KSD1588YTU, 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 KSD1588YTU part is unused and in its original packaging.

Return procedure for KSD1588YTU:

1.Submit a request within 90 days.

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

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