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onsemi KSH122TM
- Part No.:
- KSH122TM
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
KSH122TM.pdf
- Description:
- TRANS NPN DARL 100V 8A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,542
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Product details
Overview
KSH122TM from onsemi is an NPN silicon Darlington transistor in TO-252 (DPAK) package, rated for 100 V VCEO, 8 A DC collector current, and 20 W power dissipation at TC = 25°C, with built-in emitter-collector damper diode and hFE ≥ 1000 at IC = 4 A - used as a high-gain power switch in DC-DC converter output stages.
For engineers reviewing the KSH122TM datasheet, pinout, applications, or equivalent options, key selection considerations include its Darlington architecture enabling low base drive requirements, integrated damper diode eliminating external snubber needs in inductive switching, and DPAK thermal performance suitable for surface-mount power regulation designs.
Technical Context
The KSH122TM implements a monolithic Darlington pair with internal base-emitter resistors (R1 ≈ 8 kΩ, R2 ≈ 0.12 kΩ), delivering high DC current gain while maintaining controlled saturation behavior. Its built-in damper diode connects emitter to collector, providing intrinsic flyback protection without external components.
It operates as a single-polarity, medium-power switching device with VCE(sat) = 2 V at IC = 4 A / IB = 16 mA and VBE(sat) = 4.5 V at IC = 8 A / IB = 80 mA - indicating significant base drive overhead but enabling robust gate-less control in legacy driver circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - supports switching in 48 V bus systems with margin against transients |
| IC (DC) | 8 A - delivers sufficient output current for medium-power SMPS primary-side switches |
| PC @ TC=25°C | 20 W - enables operation with heatsink at case temperatures ≤ 100°C per derating curve |
| hFE | 1000–12000 - reduces required base drive current by factor of >1000 vs. single BJT |
| VCE(sat) | 2 V @ IC=4 A - defines conduction loss of 8 W at full load, critical for thermal design |
| Integrated Diode | Emitter-to-collector damper - eliminates need for external freewheeling diode in flyback/boost converters |
Pinout & Package
Package: TO-252-3 (DPAK), surface-mount, exposed drain pad (collector-connected), lead-formed for gull-wing mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Left) | Base | Control input requiring ~80 mA for full 8 A switching; high-impedance Darlington input |
| 2 (Center) | Collector | High-current output node tied to exposed thermal pad; primary power path |
| 3 (Right) | Emitter | Power return node; internally connected to damper diode anode |
Key Features
| Feature | Design Value |
|---|---|
| Darlington configuration | Enables single-stage amplification with hFE ≥ 1000, reducing driver complexity in relay or motor control |
| Integrated E-C damper diode | Eliminates discrete flyback diode in inductive load switching, saving PCB area and BOM count |
| TO-252 (DPAK) package | Provides 20 W thermal capability with standard SMT reflow profile and accessible thermal pad |
| Electrically similar to TIP122 | Allows drop-in replacement in legacy through-hole designs adapted for surface mount via adapter or layout update |
Applications
| Switching Regulators | DC-DC Converters |
|---|---|
Use Scenario: High-efficiency buck regulator output stage handling 5–12 V output at up to 6 A. IC Role / Device Role / Timing Role: Main power switch controlling energy transfer to output inductor and capacitor. Use Value: Built-in damper diode prevents voltage spikes during turn-off, simplifying layout and improving reliability. | Use Scenario: Isolated flyback converter primary-side switch in industrial power supplies. IC Role / Device Role / Timing Role: Primary-side switching transistor synchronized with transformer reset cycle. Use Value: 100 V VCEO rating accommodates reflected output voltage plus leakage spike margin. |
| Power Amplifiers | Motor Driver Stages |
Use Scenario: Linear audio amplifier output stage driving 4 Ω or 8 Ω speakers at ≤10 W. IC Role / Device Role / Timing Role: Class AB output transistor delivering high-current, low-distortion analog signal. Use Value: High hFE ensures stable bias under varying load impedance without complex feedback networks. | Use Scenario: H-bridge low-side driver for 24 V brushed DC motors in automation equipment. IC Role / Device Role / Timing Role: Low-side switching element controlling motor current direction and PWM duty cycle. Use Value: 8 A IC rating supports peak stall currents while DPAK package allows direct heatsinking to chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TIP122G | TO-220 package, same electrical specs, no integrated damper diode | Requires external flyback diode; unsuitable for space-constrained SMT layouts | Select when through-hole assembly is preferred and board space permits discrete diode placement |
| STP16NF06L | N-channel MOSFET (60 V, 16 A), logic-level gate, no Darlington delay | Faster switching, lower VDS(on), but lacks built-in diode and requires gate driver for high-side use | Select when higher efficiency and faster PWM response are prioritized over simplicity and low-drive compatibility |
Compared with TIP122G, KSH122TM offers SMT compatibility and integrated protection; compared with STP16NF06L, it provides simpler base-drive interface and inherent diode functionality at the cost of slower switching and higher conduction loss.
Availability
KSH122TM is available at Aetrix Electronics and suitable for switching regulators, DC-DC converters, and power amplifier designs requiring stable component supply, consistent parametric performance across production lots, and long-term industrial lifecycle support.
Supply support for KSH122TM 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 specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The KSH122TM belongs to onsemi's general-purpose power bipolar transistor family, designed specifically for cost-sensitive, high-reliability linear and switching power applications where Darlington gain and integrated protection simplify system-level implementation.
FAQ
What is the pin configuration of the KSH122TM?
The KSH122TM uses a TO-252-3 (DPAK) package with pin 1 = Base, pin 2 = Collector (connected to exposed thermal pad), and pin 3 = Emitter. This configuration matches standard DPAK footprint layouts and is verified in onsemi's official datasheet revision 3 (October 2017). The KSH122TM's pinout enables straightforward PCB routing for high-current paths and thermal management.
Does the KSH122TM include an integrated diode, and how is it connected?
Yes, the KSH122TM includes a built-in damper diode connected between emitter and collector (anode to emitter, cathode to collector). This diode is monolithically integrated and electrically verified per the equivalent circuit diagram in the official datasheet. It functions as a freewheeling path during inductive turn-off, eliminating the need for an external diode in applications like relay drivers or boost converters using the KSH122TM.
What is the maximum continuous collector current rating for the KSH122TM?
The KSH122TM is rated for 8 A DC collector current (IC) at case temperature TC = 25°C. Derating applies above 25°C per the published power derating curve - e.g., ~16 W at TC = 100°C. This rating is confirmed in the Absolute Maximum Ratings table of the KSH122TM datasheet and reflects sustained conduction capability under properly heatsinked conditions.
How does the KSH122TM compare to the TIP122 in terms of package and drive requirements?
The KSH122TM is the surface-mount (DPAK) counterpart to the through-hole TIP122, sharing identical electrical characteristics including VCEO = 100 V, IC = 8 A, and hFE ≥ 1000. Unlike the TIP122, the KSH122TM includes an integrated emitter-collector damper diode. Both require similar base drive (~80 mA for full 8 A), but the KSH122TM's DPAK package enables automated assembly and better thermal performance in compact layouts.
Is the KSH122TM suitable for linear amplifier applications?
Yes, the KSH122TM is specified for linear operation with VCE up to 100 V and junction temperature up to 150°C, and its high hFE and low VCE(sat) support stable Class AB biasing. The KSH122TM has been applied in audio output stages and precision current sources where gain stability and thermal robustness are required, as validated in onsemi's typical performance curves and application notes for Darlington transistors.
KSH122TM 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):
- 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
KSH122TM FAQ
1.How can I place an order for KSH122TM through Aetrix?
Please submit a Request for Quotation (RFQ) for KSH122TM 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 KSH122TM reliable?
The price and inventory of KSH122TM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSH122TM is usually 5 days.
3.What payment methods are accepted for KSH122TM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSH122TM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSH122TM?
KSH122TM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSH122TM 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 KSH122TM?
For technical support, including KSH122TM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSH122TM requirements.
6.How does Aetrix verify that KSH122TM is sourced from the original manufacturer or authorized distributors?
All KSH122TM 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 KSH122TM meets industry standards.
7.What is the process for return or replacement of KSH122TM?
All KSH122TM units undergo pre-shipment inspection (PSI). If there is an issue with KSH122TM, 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 KSH122TM part is unused and in its original packaging.
Return procedure for KSH122TM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSH122TM Tags
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MMBT3906LT1G
onsemi
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Diodes Incorporated
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MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
onsemi
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MMBT2222A-TP
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
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