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onsemi KSH29CTF
- Part No.:
- KSH29CTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
KSH29CTF.pdf
- Description:
- TRANS NPN 100V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,272
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Product details
Overview
KSH29CTF from ON Semiconductor is an NPN epitaxial silicon transistor designed for general-purpose amplification and low-speed switching applications, with a 100 V collector-emitter sustaining voltage (VCEO(sus)), 1 A DC collector current (IC), and 15 W collector dissipation at TC = 25°C - commonly deployed in power supply regulation and relay driver circuits.
For engineers reviewing the KSH29CTF datasheet, pinout, applications, or equivalent options, key selection considerations include its I-PAK package thermal performance, 3 MHz fT bandwidth, VCE(sat) ≤ 0.7 V at IC = 1 A / IB = 125 mA, and compatibility with legacy TIP29C-based designs requiring surface-mount upgrade paths.
Technical Context
The KSH29CTF operates as a medium-power bipolar junction transistor with fixed NPN polarity and base-controlled current amplification. Its design supports linear amplification (hFE = 15–75 at IC = 0.2–1 A) and saturated switching (VBE(on) = 1.3 V, VCE(sat) = 0.7 V), validated under pulsed and DC conditions per JEDEC JESD22-A108.
Thermal management is defined by a 150°C maximum junction temperature and 1.56 W power dissipation at ambient (Ta = 25°C), requiring heatsinking in continuous high-current operation. Safe operating area (SOA) curves confirm robustness against secondary breakdown up to 100 V and 1 A with 1 ms pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO(sus) | 100 V - Sustaining voltage under switching conditions with IB = 0; defines maximum safe off-state collector-emitter voltage before avalanche conduction. |
| IC (DC) | 1 A - Continuous collector current rating; determines maximum steady-state load drive capability without thermal derating. |
| PC (TC=25°C) | 15 W - Maximum power dissipation at case temperature of 25°C; requires mechanical heatsink interface for full utilization. |
| hFE | 15–75 - DC current gain range at VCE = 4 V; enables predictable base drive sizing across production lots and operating points. |
| fT | 3 MHz - Current gain–bandwidth product at VCE = 10 V, IC = 200 mA; limits usable frequency for small-signal amplification. |
| VCE(sat) | ≤ 0.7 V - Collector-emitter saturation voltage at IC = 1 A, IB = 125 mA; directly impacts conduction loss and thermal rise in switching mode. |
Pinout & Package
KSH29CTF uses the I-PAK (TO-251AA) surface-mount package with standardized lead formation: 3-pin configuration, single-row straight leads, and exposed drain pad for thermal conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control electrode | Receives forward-biased current to modulate collector current; requires series resistor to limit IB ≤ 0.4 A peak. |
| 2 (Collector) | Output current terminal | Connected to load or supply rail; electrically tied to exposed thermal pad in I-PAK package for heat transfer. |
| 3 (Emitter) | Reference terminal | Common return path for collector and base currents; typically grounded or connected to low-impedance source. |
Key Features
| Feature | Design Value |
|---|---|
| Electrically similar to TIP29C | Enables drop-in replacement in legacy through-hole designs when used with adapter footprints or rework-compatible layouts. |
| I-PAK surface-mount package | Reduces PCB assembly cost vs. TO-220; provides 15 W thermal capability with standard FR-4 board copper and minimal heatsink area. |
| 150°C max junction temperature | Supports operation in industrial environments up to 105°C ambient with appropriate derating and thermal design. |
| Low VCE(sat) (0.7 V) | Minimizes conduction loss in switching applications, reducing power stage inefficiency and thermal stress on adjacent components. |
Applications
| Power Supply Regulation | Relay Driver Circuit |
|---|---|
|
Use Scenario: Linear pass transistor in adjustable 0–30 V, 1 A bench power supply with foldback current limiting. IC Role / Device Role / Timing Role: NPN power switch controlling output voltage via feedback loop; dissipates up to 12 W during regulation. Use Value: KSH29CTF's 15 W PC and 100 V VCEO(sus) allow safe operation across full input-output differential while maintaining stable hFE-based control. |
Use Scenario: Driving 24 VDC, 500 mA coil relay in programmable logic controller (PLC) output module. IC Role / Device Role / Timing Role: Low-speed saturated switch turning relay on/off with microcontroller GPIO; handles inductive kickback via snubber. Use Value: KSH29CTF's 3 A ICP pulse rating and 100 V VCEO(sus) tolerate relay flyback transients without clamping diode oversizing. |
| Motor Speed Control (DC) | Audio Power Amplifier Stage |
|
Use Scenario: Single-ended Class-A amplifier stage controlling 12 V, 500 mA brushed DC motor in HVAC damper actuator. IC Role / Device Role / Timing Role: Linear current source modulating motor torque; biased at 300 mA quiescent point. Use Value: KSH29CTF's hFE stability over IC = 0.2–1 A ensures consistent gain and minimal thermal drift across motor load variations. |
Use Scenario: Output emitter-follower stage in 5 W audio amplifier feeding 8 Ω speaker load. IC Role / Device Role / Timing Role: Voltage buffer delivering low-impedance drive; operates in linear region with VCE > 2 V. Use Value: KSH29CTF's 3 MHz fT and low VCE(sat) preserve mid-band fidelity and minimize crossover distortion at 1 kHz–10 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD2955TF | PNP complement; identical I-PAK package, 60 V VCEO, 10 W PC; lower voltage rating and opposite polarity. | Requires circuit topology inversion (e.g., high-side vs. low-side switch); not interchangeable without schematic revision. | Select only for complementary pair designs where PNP functionality is explicitly required. |
| TIP29C | Through-hole TO-220 package; same VCEO(sus) = 100 V, IC = 1 A, but 15 W PC at TC = 25°C and higher thermal resistance. | Direct functional match but incompatible mounting; requires PCB redesign or adapter for surface-mount transition. | Choose for prototyping or legacy repair where through-hole assembly remains viable; KSH29CTF preferred for volume SMT production. |
Compared with MJD2955TF and TIP29C, KSH29CTF delivers superior thermal efficiency in SMT layouts, maintains identical electrical specs to TIP29C while enabling automated assembly, and avoids polarity mismatch issues inherent in PNP alternatives - making it optimal for new industrial control designs targeting reliability and manufacturability.
Availability
KSH29CTF is available at Aetrix Electronics and suitable for power supply regulation, relay driver circuits, and DC motor control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for KSH29CTF 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 management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power systems.
KSH29CTF belongs to ON Semiconductor's legacy power bipolar transistor family, originally developed by Fairchild Semiconductor to replace through-hole devices like TIP29C with surface-mount equivalents offering identical electrical behavior and enhanced thermal performance.
FAQ
What is the package type and lead configuration of KSH29CTF?
KSH29CTF uses the I-PAK (TO-251AA) surface-mount package with three straight leads in a single row. Pin 1 is Base, Pin 2 is Collector (tied to exposed thermal pad), and Pin 3 is Emitter. This configuration supports automated pick-and-place assembly and direct thermal coupling to PCB copper layers.
Does KSH29CTF have the same electrical specifications as TIP29C?
Yes, KSH29CTF matches TIP29C's core electrical parameters: VCEO(sus) = 100 V, IC = 1 A, PC = 15 W at TC = 25°C, and hFE = 15–75. However, KSH29CTF achieves this in an I-PAK package with lower thermal resistance than TO-220, improving power handling in compact layouts.
What is the maximum safe operating voltage for KSH29CTF in switching applications?
The maximum safe collector-emitter voltage for KSH29CTF in switching applications is 100 V, specified as VCEO(sus) with IB = 0. This value is validated under pulsed conditions and accounts for transient overvoltage tolerance, making it suitable for 24–48 V industrial bus applications with margin.
Can KSH29CTF be used in linear amplifier configurations?
Yes, KSH29CTF is rated for linear operation with hFE specified from IC = 0.2 A to 1 A at VCE = 4 V. Its 3 MHz fT and stable gain profile support audio and instrumentation amplifier stages, provided junction temperature remains below 150°C via proper heatsinking.
What is the thermal resistance from junction to case (RθJC) for KSH29CTF?
The junction-to-case thermal resistance (RθJC) for KSH29CTF in I-PAK package is 1.67°C/W, derived from PC = 15 W at TC = 25°C and TJ(max) = 150°C. This value assumes full thermal pad soldering to ≥1 in² of 2-oz copper on FR-4 PCB.
KSH29CTF 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
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 125mA, 1A
- Current - Collector Cutoff (Max):
- 50µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 15 @ 1A, 4V
- Power - Max:
- 1.56 W
- Frequency - Transition:
- 3MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
KSH29CTF FAQ
1.How can I place an order for KSH29CTF through Aetrix?
Please submit a Request for Quotation (RFQ) for KSH29CTF 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 KSH29CTF reliable?
The price and inventory of KSH29CTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSH29CTF is usually 5 days.
3.What payment methods are accepted for KSH29CTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSH29CTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSH29CTF?
KSH29CTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSH29CTF 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 KSH29CTF?
For technical support, including KSH29CTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSH29CTF requirements.
6.How does Aetrix verify that KSH29CTF is sourced from the original manufacturer or authorized distributors?
All KSH29CTF 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 KSH29CTF meets industry standards.
7.What is the process for return or replacement of KSH29CTF?
All KSH29CTF units undergo pre-shipment inspection (PSI). If there is an issue with KSH29CTF, 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 KSH29CTF part is unused and in its original packaging.
Return procedure for KSH29CTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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