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onsemi KSH112TM
- Part No.:
- KSH112TM
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
KSH112TM.pdf
- Description:
- TRANS NPN DARL 100V 2A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,263
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Product details
Overview
KSH112TM from ON Semiconductor is an NPN silicon Darlington transistor in D-PAK surface-mount package, rated for 100 V VCEO, 2 A DC collector current, and 20 W collector dissipation at TC = 25°C, with built-in emitter-collector damper diode and minimum hFE of 500 at IC = 0.5 A - used in high-gain switching applications such as relay drivers and motor controls.
For engineers reviewing the KSH112TM datasheet, pinout, applications, or equivalent options, key selection criteria include its Darlington configuration enabling low-base-drive requirements, integrated damper diode eliminating external snubbing, and D-PAK thermal performance suitable for industrial power interface designs.
Technical Context
The KSH112TM implements a monolithic Darlington pair with internal base-emitter resistor network (R1 ≈ 10 kΩ, R2 ≈ 0.6 kΩ) and integrated emitter-collector damper diode. It operates with VBE(sat) = 4 V at IC = 4 A / IB = 40 mA and fT = 25 MHz under VCE = 10 V / IC = 0.75 A conditions.
Its safe operating area supports pulsed IC up to 4 A (duty cycle ≤2%, PW ≤300 µs), and thermal derating begins at TC > 25°C with linear reduction to zero dissipation at TC = 175°C. Junction temperature is rated to 150°C with storage range from –65°C to 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - Maximum sustainable collector-emitter voltage before breakdown under open-base condition. |
| IC (DC) | 2 A - Continuous collector current capability with adequate heatsinking at TC = 25°C. |
| hFE | 500–12,000 - High DC current gain enables microcontroller-level base drive (e.g., 8 mA drives 2 A load). |
| VCE(sat) | 2–3 V - Low saturation voltage reduces conduction loss in switching applications. |
| Cob | 100 pF - Output capacitance at VCB = 10 V affects high-frequency turn-off behavior. |
| PC (TC=25°C) | 20 W - Thermal power handling with case-mounted heatsink; derates linearly above 25°C. |
| Package | D-PAK - Surface-mount thermally enhanced package with exposed drain pad for PCB copper thermal spreading. |
Pinout & Package
D-PAK package with three terminals: 1–Base, 2–Collector (tab-connected), 3–Emitter. Exposed collector tab provides low thermal resistance path to PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input node | Receives low-current drive signal; internal R1/R2 bias network simplifies external driver design. |
| 2 (Collector) | High-current output node | Connected to exposed metal tab; must be electrically isolated from other layers unless referenced to same potential. |
| 3 (Emitter) | Power return path | Internally tied to damper diode cathode; connects to load return or ground in high-side switch configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated damper diode | Eliminates need for external flyback diode in inductive load switching (e.g., solenoids, relays). |
| Monolithic Darlington structure | Provides hFE ≥500 at IC = 0.5 A, reducing required base drive current by two orders of magnitude vs. single BJT. |
| D-PAK thermal performance | Enables 20 W dissipation at TC = 25°C with PCB copper thermal spreading - superior to TO-220 in space-constrained layouts. |
| Lead-formed for SMT | Flat leads with gull-wing profile ensure reliable reflow soldering and mechanical stability on FR-4 boards. |
Applications
| Relay Driver Circuits | DC Motor Control (Low-Power) |
|---|---|
|
Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules and industrial control panels. IC Role / Device Role / Timing Role: High-gain switch amplifying logic-level signals to energize relay coils with minimal MCU GPIO loading. Use Value: Integrated damper diode clamps inductive kickback, preventing MCU reset or logic corruption without discrete components. |
Use Scenario: Bidirectional control of small brushed DC motors (<100 W) in HVAC actuators and office equipment. IC Role / Device Role / Timing Role: Single-ended switch in H-bridge half-leg or unidirectional PWM drive stage. Use Value: VCE(sat) ≤3 V at 4 A ensures <3 W conduction loss, supporting continuous duty at ambient temperatures up to 70°C. |
| Solenoid Actuator Interface | Power Supply Sequencing |
|
Use Scenario: Controlling fuel injectors, pneumatic valves, or locking mechanisms in automotive body electronics. IC Role / Device Role / Timing Role: High-current, fast-turn-on switch managing inductive loads with precise timing windows. Use Value: tON < 1 µs at IC = 2 A enables accurate pulse-width modulation for proportional flow control. |
Use Scenario: Enabling 12 V auxiliary rails in telecom power systems after primary supply stabilization. IC Role / Device Role / Timing Role: Soft-start and overcurrent-protected enable switch for secondary power domains. Use Value: Built-in damper diode absorbs back-EMF during fault shutdown, protecting upstream regulators and sense circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| FJD13009 | Higher VCEO (400 V), lower hFE (min. 20), no integrated damper diode. | Requires external flyback diode; suited for higher-voltage but lower-gain switching where speed is critical. | Select when operating above 100 V or needing faster switching than Darlington topology allows. |
| MJD122 | Same VCEO (100 V), lower IC (1.5 A), no damper diode, TO-252 package. | Limited current capacity and missing integrated protection increase BOM count and layout complexity. | Choose only if legacy TO-252 footprint compatibility is mandatory and damper diode can be added externally. |
Compared with FJD13009 and MJD122, the KSH112TM delivers higher DC gain and integrated protection in a thermally optimized D-PAK, reducing component count and improving reliability in 24 V industrial switching - but trades off maximum voltage rating and raw switching speed.
Availability
KSH112TM is available at Aetrix Electronics and suitable for relay drivers, solenoid interfaces, low-power motor controls, and power sequencing circuits requiring stable component supply and long-term industrial availability.
Supply support for KSH112TM 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 energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The KSH112TM belongs to ON Semiconductor's legacy Fairchild power transistor portfolio, designed specifically for high-gain, medium-power switching in space-constrained industrial and automotive body electronics.
FAQ
What is the pin configuration of the KSH112TM?
The KSH112TM uses a D-PAK package with three terminals: Pin 1 is Base, Pin 2 is Collector (connected to the exposed metal tab), and Pin 3 is Emitter. The internal damper diode is connected between Emitter (anode) and Collector (cathode), confirmed in the device's equivalent circuit diagram.
Does the KSH112TM require an external flyback diode when driving inductive loads?
No - the KSH112TM integrates a damper diode between Emitter and Collector, explicitly stated in its datasheet features. This eliminates the need for an external flyback diode in relay, solenoid, or motor coil applications, reducing BOM count and PCB area.
What is the maximum continuous collector current for the KSH112TM at 70°C case temperature?
At TC = 70°C, the KSH112TM's maximum continuous collector current is approximately 1.3 A, derived from its 20 W PC rating at 25°C and linear derating curve (20 W → 0 W over 150°C range), yielding ~133 mW/°C slope and 13.3 W available at 70°C, supporting ~1.3 A at VCE(sat) ≈ 2.5 V.
Is the KSH112TM pin-compatible with the TIP112?
No - while the KSH112TM is electrically similar to the TIP112 per datasheet notes, it uses a surface-mount D-PAK package versus the through-hole TO-220 of the TIP112. No mechanical or soldering compatibility exists; PCB layout and thermal design must be re-optimized for the D-PAK footprint.
What is the typical fT value for the KSH112TM and how does it affect switching performance?
The KSH112TM has a typical fT of 25 MHz at VCE = 10 V and IC = 0.75 A. While usable for PWM frequencies up to several hundred kHz, its Darlington structure introduces slower turn-off (tOFF > 1 µs), making it less suitable for >50 kHz high-efficiency SMPS but well-suited for relay and actuator control where speed is secondary to gain and ruggedness.
KSH112TM 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:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 3V @ 40mA, 4A
- Current - Collector Cutoff (Max):
- 20µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 1000 @ 2A, 3V
- Power - Max:
- 1.75 W
- Frequency - Transition:
- 25MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
KSH112TM FAQ
1.How can I place an order for KSH112TM through Aetrix?
Please submit a Request for Quotation (RFQ) for KSH112TM 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 KSH112TM reliable?
The price and inventory of KSH112TM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSH112TM is usually 5 days.
3.What payment methods are accepted for KSH112TM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSH112TM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSH112TM?
KSH112TM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSH112TM 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 KSH112TM?
For technical support, including KSH112TM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSH112TM requirements.
6.How does Aetrix verify that KSH112TM is sourced from the original manufacturer or authorized distributors?
All KSH112TM 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 KSH112TM meets industry standards.
7.What is the process for return or replacement of KSH112TM?
All KSH112TM units undergo pre-shipment inspection (PSI). If there is an issue with KSH112TM, 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 KSH112TM part is unused and in its original packaging.
Return procedure for KSH112TM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSH112TM Tags
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