My Inquiry
My Account
onsemi KSC2073
- Part No.:
- KSC2073
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
KSC2073.pdf
- Description:
- TRANS NPN 150V 1.5A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,174
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
KSC2073 from onsemi is an NPN epitaxial silicon power transistor designed for TV vertical deflection output stages, featuring VCBO = 150 V, VCEO = 150 V, IC = 1.5 A, PC = 25 W at TC = 25 °C, and hFE = 60–125 (H2 grade), used in high-voltage horizontal/vertical sweep circuits of CRT television systems.
For engineers reviewing the KSC2073 datasheet, pinout, applications, or equivalent options, this part supports high-voltage switching with low saturation voltage (VCE(sat) ≤ 1 V at IC = 500 mA / IB = 50 mA), stable gain across 0.1–1 A collector current, and Pb-free TO-220-3LD packaging compliant with legacy CRT timing requirements.
Technical Context
The KSC2073 operates as a medium-power, high-voltage NPN switch optimized for linear and saturated-mode deflection yoke drive. Its 150 V breakdown ratings (VCBO, VCEO), 4 MHz fT, and 50 pF Cob enable stable operation in resonant flyback and sawtooth generator topologies common in analog TV vertical output stages.
Thermal design relies on its TO-220-3LD package with case-to-ambient thermal resistance enabling 25 W dissipation at TC = 25 °C, derating linearly to zero at 150 °C junction temperature. Safe operating area (SOA) curves confirm single-pulse capability up to 100 V × 1 A with 1 ms pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO / VCEO | 150 V - supports full CRT vertical scan voltage swing without avalanche conduction |
| IC (max) | 1.5 A - delivers peak yoke current for 50/60 Hz vertical deflection in 21″–32″ CRT displays |
| PC (TC = 25 °C) | 25 W - enables direct heatsink mounting without forced air in compact TV chassis layouts |
| hFE (H2 grade) | 60–125 - ensures consistent base drive margin across production lots for reliable saturation |
| VCE(sat) | ≤1 V @ IC = 500 mA, IB = 50 mA - minimizes conduction loss and thermal stress during active scan period |
| fT | 4 MHz - sufficient bandwidth for clean switching edge control in 15.734 kHz horizontal sync-derived vertical timing |
| Cob | 50 pF @ VCB = 10 V - limits capacitive loading on driver stage while maintaining SOA stability |
Pinout & Package
Package: TO-220-3LD (Case 340AT), lead-free, with metal tab electrically connected to collector. Mounting hole centered on tab for mechanical stability and thermal transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Left) | Base | Low-impedance input for TTL/CMOS-compatible driver; requires ≥50 mA base current for full saturation |
| 2 (Center) | Collector | High-voltage output node tied to yoke primary; electrically connected to metal tab for heatsinking |
| 3 (Right) | Emitter | Ground-referenced return path; placed adjacent to base for minimal loop inductance in high-di/dt sweep current |
Key Features
| Feature | Design Value |
|---|---|
| TV vertical deflection optimization | SOA and thermal design validated for 60 Hz, 100 V–150 V, 1 A pulsed operation in CRT yoke drive |
| Complementary pairing with KSA940 | Matched breakdown (150 V), gain (hFE 60–125 vs. KSA940's 60–120), and package for push-pull output stages |
| Pb-free and halide-free construction | Meets RoHS Directive 2011/65/EU Annex II; no brominated flame retardants or chlorine-based flux residues |
| High DC current gain consistency | H2 classification guarantees hFE ≥60 at IC = 0.5 A, reducing base drive circuit complexity and component count |
Applications
| CRT Television Vertical Output | Monitor Vertical Deflection Circuit |
|---|---|
Use Scenario: Driving vertical deflection yoke in 50/60 Hz analog CRT TVs with 21″–29″ tubes. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling sawtooth current through yoke winding during vertical retrace and scan. Use Value: 150 V VCEO withstands flyback spikes; 25 W PC enables passive heatsinking; H2 hFE ensures stable base drive across temperature. |
Use Scenario: Generating vertical sweep in professional broadcast monitors requiring precise linearity and low jitter. IC Role / Device Role / Timing Role: Linear amplifier in feedback-controlled vertical ramp generator with dynamic load compensation. Use Value: 4 MHz fT supports sharp edge fidelity; 50 pF Cob minimizes phase shift in closed-loop integrator paths. |
| Legacy Video Projector Sweep Stage | Industrial CRT-Based Test Equipment |
Use Scenario: Vertical scanning in CRT-based overhead projectors with extended duty cycle and thermal cycling. IC Role / Device Role / Timing Role: Saturated switch in resonant vertical oscillator driving step-up transformer coupled to yoke. Use Value: TO-220-3LD package provides robust thermal interface; 150 °C TJ rating sustains 24/7 operation in enclosed projector chassis. |
Use Scenario: Oscilloscope and waveform analyzer CRT vertical amplifiers requiring long-term calibration stability. IC Role / Device Role / Timing Role: Precision current source in calibrated vertical deflection amplifier with DC-coupled feedback. Use Value: Tight hFE tolerance (60–125) reduces gain drift; low ICBO (≤10 µA) maintains baseline accuracy over storage intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN high-voltage switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2SC5200 | Higher IC (15 A), higher PC (150 W), but lower hFE (55–160) and larger TO-3P package; fT = 30 MHz | Designed for audio power amplification, not optimized for CRT vertical timing linearity or SOA pulse profiles | Use only if redesigning for higher power headroom and can accommodate larger footprint and different thermal path |
| KSC2690A | Same TO-220-3LD package, VCBO = 160 V, VCEO = 160 V, IC = 1.5 A, but hFE = 100–240 (broader spread), fT = 5 MHz | Targeted at general-purpose high-voltage switching; lacks TV-specific SOA validation and vertical deflection characterization | Acceptable drop-in for non-critical replacements where exact CRT timing linearity is not required |
Compared with KSC2073, 2SC5200 offers greater power handling but demands major PCB and heatsink changes, while KSC2690A provides tighter voltage margins and higher fT but less predictable gain behavior in legacy TV timing loops.
Availability
KSC2073 is available at Aetrix Electronics and suitable for CRT television repair, analog video monitor refurbishment, and industrial test equipment maintenance requiring stable component supply for legacy high-voltage analog signal paths.
Supply support for KSC2073 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, and consumer markets.
The KSC2073 belongs to onsemi's legacy TV deflection transistor product line, engineered specifically for reliability and timing precision in analog CRT vertical output stages from the 1990s–2000s.
FAQ
What is the pin configuration of the KSC2073?
The KSC2073 uses a TO-220-3LD package with standardized pinout: Pin 1 is Base, Pin 2 is Collector (connected to metal tab), and Pin 3 is Emitter. This layout matches JEDEC TO-220 mechanical standard and is confirmed in the official onsemi datasheet revision 3, page 1 marking diagram. The KSC2073 must be mounted with electrical isolation between tab and heatsink unless collector grounding is intentional.
Is the KSC2073 still in active production?
No - the KSC2073 is officially discontinued per onsemi's datasheet revision 3 (January 2026), marked "DISCONTINUED" in the Ordering Information table. However, Aetrix Electronics maintains legacy inventory and traceable second-source channels for KSC2073 to support repair and maintenance of installed CRT-based systems.
What does the 'H2' suffix mean in KSC2073H2TU?
The 'H2' in KSC2073H2TU denotes the hFE classification grade: guaranteed DC current gain of 60–125 at VCE = 10 V and IC = 0.5 A. This is distinct from the H1 grade (40–80). The full orderable part number KSC2073H2TU specifies Pb-free TO-220-3LD packaging with C2073-2 marking and tube packaging (1000 units).
Can the KSC2073 replace the KSC2073TU?
Yes - KSC2073H2TU is a functional and pin-compatible revision of KSC2073TU, differing only in hFE grading (H2 vs. unspecified grade in TU version) and marking (C2073-2 vs. C2073). Both share identical absolute maximum ratings, TO-220-3LD package, and electrical characteristics; no PCB or schematic changes are needed for substitution.
What is the safe operating area (SOA) limit for the KSC2073 at 100 °C case temperature?
At TC = 100 °C, the KSC2073's maximum continuous collector current drops to approximately 1.1 A at VCE = 50 V, per the Power Derating curve (Figure 6) and SOA graph (Figure 5) in the onsemi datasheet. Pulse operation (1 ms) extends usable range to 1.5 A at 100 V, constrained by secondary breakdown limits - critical for vertical retrace surge handling.
KSC2073 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 1V @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 10µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 500mA, 10V
- Power - Max:
- 25 W
- Frequency - Transition:
- 4MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
KSC2073 FAQ
1.How can I place an order for KSC2073 through Aetrix?
Please submit a Request for Quotation (RFQ) for KSC2073 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 KSC2073 reliable?
The price and inventory of KSC2073 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC2073 is usually 5 days.
3.What payment methods are accepted for KSC2073?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC2073 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSC2073?
KSC2073 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSC2073 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 KSC2073?
For technical support, including KSC2073 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC2073 requirements.
6.How does Aetrix verify that KSC2073 is sourced from the original manufacturer or authorized distributors?
All KSC2073 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 KSC2073 meets industry standards.
7.What is the process for return or replacement of KSC2073?
All KSC2073 units undergo pre-shipment inspection (PSI). If there is an issue with KSC2073, 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 KSC2073 part is unused and in its original packaging.
Return procedure for KSC2073:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSC2073 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…
