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

onsemi KSH127TM

Name: KSH127TM
Brand: onsemi
SKU: KSH127TM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSH127TM

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: KSH127TM.pdf

Description:: TRANS PNP DARL 100V 8A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSH127TM from ON Semiconductor is a PNP silicon Darlington transistor in D-PAK surface-mount package, rated for -100 V V_CEO, -8 A DC collector current, and 20 W collector dissipation at T_C = 25°C, with minimum h_FE of 1000 at I_C = -4 A. It integrates a built-in damper diode across collector-emitter and is used in high-current linear switching and relay driver circuits.

For engineers reviewing the KSH127TM datasheet, pinout, applications, or equivalent options, key selection criteria include its -100 V blocking capability, Darlington gain structure enabling low-base-drive requirements, integrated damper diode for inductive load protection, and D-PAK thermal performance suitable for industrial motor control and power supply output stages.

Technical Context

The KSH127TM implements a monolithic PNP Darlington pair with internal base-emitter resistors (R1 ≈ 8 kΩ, R2 ≈ 0.12 kΩ) and an integrated emitter-collector damper diode. Its Darlington configuration delivers high DC current gain (h_FE ≥ 1000) while maintaining V_CE(sat) ≤ -2 V at I_C = -4 A / I_B = -16 mA.

It operates within a junction temperature range of -65°C to +150°C and exhibits Cob = 300 pF at V_CB = -10 V, f = 0.1 MHz. The device is electrically similar to TIP127 but optimized for surface-mount assembly with lead-formed D-PAK footprint and enhanced thermal derating above 25°C case temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-100 V - Maximum sustainable collector-emitter voltage under open-base conditions, defining safe operation in high-voltage switching applications.
I_C (DC)	-8 A - Continuous collector current rating, supporting robust load driving without forced cooling in compact industrial modules.
P_C (T_C=25°C)	20 W - Maximum power dissipation at case temperature 25°C, requiring heatsinking for sustained high-current operation.
h_FE	1000 min - Minimum DC current gain at V_CE = -4 V, I_C = -4 A, enabling microcontroller-level base drive with minimal external components.
V_CE(sat)	-2 V max - Collector-emitter saturation voltage at I_C = -4 A / I_B = -16 mA, limiting conduction loss and self-heating in linear-regulator or lamp-driver use cases.
C_ob	300 pF - Output capacitance at V_CB = -10 V, influencing switching speed and EMI behavior in PWM-controlled loads.

Pinout & Package

D-PAK (TO-252) surface-mount package with three terminals: 1–Base, 2–Collector, 3–Emitter. Thermal pad on underside provides primary heat path to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input node	Drives Darlington pair; requires current-limited drive due to integrated R1/R2 bias network and low V_BE(on) (-2.8 V).
2 (Collector)	High-side switched output	Connected to load return path; shares internal damper diode anode with emitter terminal for flyback energy clamping.
3 (Emitter)	Power reference node	Common connection point for load high-side supply; internally tied to damper diode cathode and base resistor network.

Key Features

Feature	Design Value
Integrated damper diode	Eliminates need for external flyback diode in relay, solenoid, and inductive motor driver designs, reducing BOM count and PCB area.
D-PAK surface-mount package	Enables automated assembly and improves thermal transfer to PCB copper compared to through-hole TO-220 alternatives.
High h_FE (≥1000)	Reduces required base drive current by >10× versus single PNP transistors, easing interface with low-power logic or MCU GPIOs.
Complement to KSH122	Forms matched NPN/PNP pair for push-pull output stages in audio amplifiers or H-bridge drivers without discrete matching.

Applications

Industrial Relay Driver	DC Motor Direction Control
Use Scenario: Driving 24 V/5 A industrial relays in PLC output modules where inductive kick must be suppressed without external components. IC Role / Device Role / Timing Role: High-current PNP switch with integrated damper diode providing active clamping during relay coil de-energization. Use Value: Eliminates discrete flyback diode, reduces component count by one part per channel, and ensures consistent turn-off timing across temperature.	Use Scenario: Bidirectional 12 V brushed DC motor control in embedded motion systems using complementary KSH122/KSH127TM H-bridge topology. IC Role / Device Role / Timing Role: Upper-leg PNP switch in half-bridge configuration, delivering -8 A peak current with <2 V saturation drop. Use Value: Enables compact, thermally efficient motor driver layout with matched gain and voltage ratings versus its NPN complement.
Linear Voltage Regulator Pass Element	High-Voltage Lamp Dimmer
Use Scenario: Series pass transistor in adjustable 0–30 V, 3 A linear regulator for test equipment requiring low-noise, ripple-free output. IC Role / Device Role / Timing Role: Power regulation element operating in active region, leveraging high h_FE for stable loop gain and low base drive burden. Use Value: Maintains regulation accuracy over wide load range with minimal base current error contribution, improving line/load regulation.	Use Scenario: Phase-controlled dimming of 100 V incandescent lamps in commercial lighting controllers with zero-crossing synchronization. IC Role / Device Role / Timing Role: High-voltage, high-current switching element handling full AC half-cycle conduction with integrated damper for snubberless operation. Use Value: Supports direct mains-referenced switching up to -100 V V_CEO, reducing isolation complexity and enabling compact transformerless designs.

Industrial Relay Driver

DC Motor Direction Control

Use Scenario: Driving 24 V/5 A industrial relays in PLC output modules where inductive kick must be suppressed without external components.

IC Role / Device Role / Timing Role: High-current PNP switch with integrated damper diode providing active clamping during relay coil de-energization.

Use Value: Eliminates discrete flyback diode, reduces component count by one part per channel, and ensures consistent turn-off timing across temperature.

Use Scenario: Bidirectional 12 V brushed DC motor control in embedded motion systems using complementary KSH122/KSH127TM H-bridge topology.

IC Role / Device Role / Timing Role: Upper-leg PNP switch in half-bridge configuration, delivering -8 A peak current with <2 V saturation drop.

Use Value: Enables compact, thermally efficient motor driver layout with matched gain and voltage ratings versus its NPN complement.

Linear Voltage Regulator Pass Element

High-Voltage Lamp Dimmer

Use Scenario: Series pass transistor in adjustable 0–30 V, 3 A linear regulator for test equipment requiring low-noise, ripple-free output.

IC Role / Device Role / Timing Role: Power regulation element operating in active region, leveraging high h_FE for stable loop gain and low base drive burden.

Use Value: Maintains regulation accuracy over wide load range with minimal base current error contribution, improving line/load regulation.

Use Scenario: Phase-controlled dimming of 100 V incandescent lamps in commercial lighting controllers with zero-crossing synchronization.

IC Role / Device Role / Timing Role: High-voltage, high-current switching element handling full AC half-cycle conduction with integrated damper for snubberless operation.

Use Value: Supports direct mains-referenced switching up to -100 V V_CEO, reducing isolation complexity and enabling compact transformerless designs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127G	Same V_CEO (-100 V), lower I_C (-5 A), no integrated damper diode, DPAK package	Requires external flyback diode; less suitable for space-constrained relay drivers	Select when damper diode is already present in system design or when lower current rating suffices
TIP127	Identical electrical specs, TO-220 through-hole package, no damper diode	Not surface-mountable; requires manual assembly and larger heatsink footprint	Select for prototyping or legacy through-hole designs where rework tolerance and thermal mass outweigh SMT benefits

Compared with MJD127G and TIP127, the KSH127TM uniquely combines D-PAK surface-mount compatibility, -8 A current capability, and integrated damper diode-reducing component count and board area while maintaining full -100 V blocking and high-gain drive efficiency in production-grade industrial controls.

Availability

KSH127TM is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor direction control, linear voltage regulators, high-voltage lamp dimmers, and programmable power supplies requiring stable component supply and long-term manufacturability.

Supply support for KSH127TM 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The KSH127TM belongs to ON Semiconductor's legacy Fairchild PNP Darlington transistor product line, designed specifically for high-reliability industrial switching applications demanding integrated protection, high current gain, and surface-mount thermal performance.

FAQ

What is the maximum continuous collector current rating for the KSH127TM?

The KSH127TM has a maximum continuous collector current (I_C) rating of -8 A at T_C = 25°C. This rating assumes proper heatsinking and derates linearly above 25°C case temperature per the published power derating curve. Operation beyond this limit risks thermal runaway or permanent junction damage. Always verify actual thermal conditions in the final application before committing to full-rated current in the KSH127TM design.

Does the KSH127TM include an integrated damper diode, and how is it connected?

Yes, the KSH127TM includes a built-in damper diode connected between collector and emitter, with cathode at emitter and anode at collector. This configuration clamps inductive flyback voltage during turn-off, eliminating the need for an external diode in relay, solenoid, or motor coil drive applications. The diode is monolithically integrated and shares the same thermal environment as the Darlington junction, ensuring coordinated reliability in the KSH127TM.

What is the DC current gain (h_FE) specification for the KSH127TM, and under what conditions is it guaranteed?

The KSH127TM guarantees a minimum DC current gain (h_FE) of 1000 at V_CE = -4 V and I_C = -4 A. A second gain bin of 100–12,000 is specified under identical conditions. This high gain enables low-base-drive operation, making the KSH127TM compatible with standard logic-level outputs without additional driver stages in most applications.

Can the KSH127TM be used as a direct replacement for the TIP127 in existing designs?

The KSH127TM matches the TIP127's core electrical specifications (V_CEO, I_C, h_FE, V_CE(sat)) but uses a D-PAK surface-mount package instead of TO-220. While functionally equivalent, the KSH127TM is not a drop-in mechanical replacement due to different footprint and thermal mounting. A PCB redesign is required to accommodate the D-PAK layout and thermal pad. However, the integrated damper diode adds functional value not present in the TIP127.

What is the safe operating area (SOA) limitation for the KSH127TM at DC and pulse conditions?

The KSH127TM SOA is defined by its maximum collector dissipation (20 W at T_C = 25°C), V_CEO limit (-100 V), and peak pulse current (-16 A). At DC, operation must remain within the derated power envelope shown in Figure 6 and Figure 7 of the datasheet. For pulses ≤300 µs with ≤2% duty cycle, the device supports higher instantaneous current but remains constrained by secondary breakdown limits. Always validate SOA compliance in the KSH127TM's actual switching waveform and thermal environment.

KSH127TM Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 8 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 4V @ 80mA, 8A

Current - Collector Cutoff (Max):: 10µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 1000 @ 4A, 4V

Power - Max:: 1.75 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

KSH127TM FAQ

1.How can I place an order for KSH127TM through Aetrix?

Please submit a Request for Quotation (RFQ) for KSH127TM 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 KSH127TM reliable?

The price and inventory of KSH127TM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSH127TM is usually 5 days.

3.What payment methods are accepted for KSH127TM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSH127TM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSH127TM?

KSH127TM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSH127TM 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 KSH127TM?

For technical support, including KSH127TM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSH127TM requirements.

6.How does Aetrix verify that KSH127TM is sourced from the original manufacturer or authorized distributors?

All KSH127TM 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 KSH127TM meets industry standards.

7.What is the process for return or replacement of KSH127TM?

All KSH127TM units undergo pre-shipment inspection (PSI). If there is an issue with KSH127TM, 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 KSH127TM part is unused and in its original packaging.

Return procedure for KSH127TM:

1.Submit a request within 90 days.

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

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