My Inquiry
My Account
onsemi KSH41CITU
- Part No.:
- KSH41CITU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Datasheet:
-
KSH41CITU.pdf
- Description:
- TRANS NPN 100V 6A IPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,750
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
KSH41CITU from ON Semiconductor is a surface-mount NPN epitaxial silicon transistor rated for 100 V VCEO, 6 A DC collector current, and 20 W collector dissipation at TC = 25°C. It serves as a general-purpose amplifier and low-speed switching device in power supply output stages, motor drive interfaces, and relay drivers where robust thermal performance and proven ruggedness are required.
For engineers reviewing the KSH41CITU datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (D-PAK), confirmed terminal roles (Base–Collector–Emitter), absolute maximum ratings, real-world saturation behavior (VCE(sat) = 1.5 V @ 6 A/600 mA), and two validated alternative parts with documented functional trade-offs.
Technical Context
The KSH41CITU operates as a medium-power bipolar junction transistor with fixed gain structure optimized for linear amplification and hard-switching duty. Its hFE ranges from 30 to 75 at IC = 0.3 A and drops to 15–30 at IC = 3 A, indicating intentional gain compression under high-current conduction-critical for stable biasing in Class AB audio stages and regulated DC-DC feedback paths.
Thermal design is constrained by its D-PAK package's 1.75 W ambient-rated dissipation and 20 W case-rated limit, requiring heatsinking above ~1.2 A continuous operation. Safe operating area (SOA) curves confirm pulsed capability up to 10 A with ≤2% duty cycle, aligning with intermittent load switching in industrial control outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - Maximum sustainable collector-emitter voltage before breakdown; enables use in 48 V and 72 V DC bus switching applications. |
| IC (DC) | 6 A - Continuous collector current rating; defines maximum steady-state load handling without forced cooling. |
| VCE(sat) | 1.5 V @ IC = 6 A, IB = 600 mA - Low saturation voltage minimizes conduction loss in switching regulators and H-bridge half-bridges. |
| hFE | 30–75 @ VCE = 4 V - Gain range supports predictable base drive sizing across production lots and temperature extremes. |
| fT | 3 MHz - Bandwidth suitable for audio-frequency amplification and <100 kHz PWM switching, not RF or high-speed digital use. |
| PC (TC=25°C) | 20 W - Case-referenced power dissipation limit; requires direct thermal interface to heatsink for sustained >1.5 A operation. |
Pinout & Package
Package: D-PAK (TO-252AA), surface-mount, lead-formed for PCB assembly. Thermal pad on drain-side (Collector) enables efficient heat transfer to copper pour or heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Left) | Base | Control input requiring ~600 mA peak drive for full saturation at 6 A; must be current-limited to avoid damage. |
| 2 (Center) | Collector | Main power path output; electrically connected to thermal pad; requires low-inductance routing for switching stability. |
| 3 (Right) | Emitter | Reference node for base drive and load return; common connection point for emitter degeneration resistors in amplifier designs. |
Key Features
| Feature | Design Value |
|---|---|
| Electrically similar to TIP41C | Enables drop-in replacement in legacy through-hole designs when adapted to D-PAK footprint and thermal layout. |
| 150°C max junction temperature | Supports operation in sealed enclosures or high-ambient environments (e.g., automotive engine bays, industrial cabinets). |
| Low VBE(on) (2 V @ IC = 4 A) | Reduces base drive power loss and eases compatibility with 3.3 V or 5 V logic-level controllers. |
| SOA-rated for 10 A pulse | Validates short-duration surge tolerance (e.g., motor startup, solenoid energization) without secondary breakdown. |
Applications
| DC Power Supply Regulation | Industrial Relay Driver |
|---|---|
Use Scenario: Linear pass transistor in adjustable 0–30 V, 0–5 A bench power supply with foldback current limiting. IC Role / Device Role / Timing Role: Main series-pass element controlling output voltage via feedback loop; operates in active region with continuous conduction. Use Value: High VCEO and 20 W case dissipation allow safe regulation across wide input-output differentials without derating at 25°C ambient. |
Use Scenario: Driving 24 V DC industrial relays (100–500 mA coil) from microcontroller GPIO pins. IC Role / Device Role / Timing Role: Switching interface between low-voltage logic and inductive load; biased into saturation during ON state. Use Value: Verified VCE(sat) ≤ 1.5 V ensures minimal self-heating and reliable turn-off with standard RC snubbing. |
| Audio Amplifier Output Stage | Motor Speed Control Interface |
Use Scenario: Complementary Class AB output pair in 10 W mono audio amplifier feeding 4 Ω speaker load. IC Role / Device Role / Timing Role: NPN half of push-pull stage delivering peak current up to 3 A; biased near cutoff for low crossover distortion. Use Value: Stable hFE over IC = 0.3–3 A enables consistent quiescent current setting and thermal tracking with matched PNP partner. |
Use Scenario: Low-frequency PWM driver for brushed DC motor (12–48 V, 2–5 A) in conveyor or actuator system. IC Role / Device Role / Timing Role: Single-ended switch controlling motor direction via external H-bridge; operated at ≤5 kHz to stay within fT margin. Use Value: SOA compliance at 10 A pulse accommodates motor stall currents without secondary breakdown risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| FZT790A | Higher hFE (100 min @ IC = 1 A), lower VCE(sat) (1.2 V), but only 80 V VCEO. | Preferred in low-voltage (<40 V) high-gain linear circuits; unsuitable for 72 V bus applications. | Select FZT790A when gain stability at low IC and reduced base drive are prioritized over voltage headroom. |
| MJD127G | Same VCEO (100 V), higher IC (8 A), but larger TO-263 package and 30 W PC rating. | Better suited for higher-current, heatsink-mounted designs where board space allows larger footprint. | Choose MJD127G when >6 A continuous current or enhanced thermal margin is required without changing layout. |
Compared with FZT790A and MJD127G, the KSH41CITU offers balanced voltage/current capability in the compact D-PAK form factor-ideal for cost-sensitive, space-constrained 48–72 V industrial controls where moderate gain and proven reliability outweigh extreme parameter optimization.
Availability
KSH41CITU is available at Aetrix Electronics and suitable for DC power supply regulation, industrial relay driving, audio amplifier output stages, and motor speed control interfaces requiring stable component supply and long-term industrial lifecycle support.
Supply support for KSH41CITU 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 (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor components focused on automotive, industrial, cloud, and IoT applications.
The KSH41CITU belongs to ON Semiconductor's legacy power bipolar transistor family, designed specifically for robust, cost-effective linear amplification and low-speed switching in industrial power electronics and analog signal conditioning systems.
FAQ
What is the maximum continuous collector current for KSH41CITU at 75°C case temperature?
The KSH41CITU's power derating curve shows linear reduction from 20 W at 25°C to zero at 150°C. At TC = 75°C, allowable PC is ~13.3 W. Using VCE(sat) ≈ 1.5 V, maximum continuous IC is approximately 8.9 A-but absolute maximum IC remains 6 A per datasheet limits. Therefore, KSH41CITU must be operated ≤6 A regardless of temperature to avoid exceeding rated current stress.
Is KSH41CITU pin-compatible with the through-hole TIP41C?
No-KSH41CITU uses a D-PAK (TO-252AA) surface-mount package with terminals arranged Base–Collector–Emitter (left-to-right), while TIP41C uses TO-220 with Collector–Base–Emitter (center–left–right) pinout. Though electrically similar, KSH41CITU requires PCB redesign and thermal pad layout; it is not a pin-compatible drop-in replacement.
Does KSH41CITU support operation in avalanche mode?
No-KSH41CITU is not rated or characterized for repetitive avalanche energy. Its datasheet specifies only VCEO, VCBO, and VEBO as absolute maximums, with no EAS or IAR parameters. Inductive switching must include external clamping (e.g., flyback diode) to prevent destructive voltage overshoot beyond 100 V.
What is the typical base-emitter on voltage for KSH41CITU at 4 A collector current?
The datasheet specifies VBE(on) = 2 V at IC = 4 A and IB = 400 mA (implied by hFE ≥ 10). This value is measured under saturated conduction conditions and remains stable across production lots, enabling accurate base resistor calculation for microcontroller-driven switching applications using KSH41CITU.
Can KSH41CITU be used in Class D audio amplifier output stages?
No-KSH41CITU's fT of 3 MHz and relatively slow turn-on/turn-off times (tr, tf in µs range) make it unsuitable for Class D switching frequencies (>200 kHz). Its design targets linear amplification and low-speed switching; using KSH41CITU in Class D would cause excessive switching loss, thermal runaway, and audible distortion.
KSH41CITU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 6 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.5V @ 600mA, 6A
- Current - Collector Cutoff (Max):
- 50µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 15 @ 3A, 4V
- Power - Max:
- 1.75 W
- Frequency - Transition:
- 3MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- IPAK
KSH41CITU FAQ
1.How can I place an order for KSH41CITU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSH41CITU 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 KSH41CITU reliable?
The price and inventory of KSH41CITU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSH41CITU is usually 5 days.
3.What payment methods are accepted for KSH41CITU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSH41CITU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSH41CITU?
KSH41CITU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSH41CITU 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 KSH41CITU?
For technical support, including KSH41CITU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSH41CITU requirements.
6.How does Aetrix verify that KSH41CITU is sourced from the original manufacturer or authorized distributors?
All KSH41CITU 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 KSH41CITU meets industry standards.
7.What is the process for return or replacement of KSH41CITU?
All KSH41CITU units undergo pre-shipment inspection (PSI). If there is an issue with KSH41CITU, 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 KSH41CITU part is unused and in its original packaging.
Return procedure for KSH41CITU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSH41CITU Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
