Keszoox
Through-Hole Electronic Components & Capacitor Specialist — THT Resistors, Capacitors, Transistors, Regulators & Fuses | Repair, Hobby & Lab
Through-Hole Electronic Components & Capacitor Specialist THT Resistors, Capacitors, Transistors, Regulators & Fuses | Repair, Hobby & Lab
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Through-Hole Components & Capacitor Specialist — Every Value, Every Type, Ready to Ship
Not every circuit runs on surface-mount components. Through-hole (THT) components remain the backbone of power electronics, industrial control boards, audio equipment, legacy system repair, and hands-on electronics education. When you need a BC171B transistor, an L7808LC voltage regulator, a 2500µF electrolytic capacitor, or a glass tube fuse — Keszoox has it in stock, individually or in bulk.
We are a specialist stocking distributor for through-hole resistors, capacitors, transistors, voltage regulators, inductors, and fuses, serving board repair technicians, electronics hobbyists, university labs, and small-batch production teams worldwide.
SOT & Small-Outline Package Types — 12 Variants In Stock
Small-outline transistor (SOT) packages bridge the gap between through-hole and fine-pitch SMD. Our SOT inventory covers every standard variant used in discrete transistor, MOSFET, and small IC applications:
| Package | Pin Count | Typical Use | Footprint |
|---|---|---|---|
| SOT-23 / SOT231 | 3 pins | NPN/PNP BJT, MOSFET, LDO regulator | 2.9 × 1.3mm |
| SOT-89 | 3 pins | Medium-power transistor, LDO up to 500mA | 4.5 × 2.5mm |
| SOT-143 | 4 pins | Dual transistor, RF transistor | 2.9 × 1.3mm |
| SOT-220 / STO-220 | 3 pins | Power transistor, voltage regulator up to 2A | 10.4 × 4.7mm |
| SOT-223 | 4 pins | LDO regulator, power transistor up to 1A | 6.5 × 3.5mm |
| SOT-343 | 4 pins | Dual transistor, RF amplifier | 2.0 × 1.25mm |
| SOT-523 | 3 pins | Ultra-small BJT, ESD protection | 1.6 × 0.8mm |
| SOT-891 | 5 pins | Dual transistor, logic gate | 1.0 × 0.6mm |
| SSOP / SSOP-16L | 8–28 pins | Logic ICs, shift registers, interface ICs | 0.65mm pitch |
| TO-3 | 2+case | High-power transistor, metal can package | Bolt-down |
Inductors — SMD & Through-Hole, Full Range
Inductors are among the most physically diverse passive components. Our inventory covers every construction type and application:
SMD Power Inductors (Shielded)
- Values: 1µH (1R0), 1.5µH (1R5), 10µH (100), 22µH (220), 47µH (470), 100µH (101), 220µH (221), 470µH (471)
- Package sizes: 2520, 3015, 4020, 4040, 5050, 6060, 7070, 8080
- Saturation current: 0.5A to 20A; DCR from 8mΩ
SMD Ferrite Beads
- 0402, 0603, 0805; 25Ω–600Ω @ 100MHz; power rail and signal line EMI suppression
Axial Color-Ring Inductors (THT)
- 1µH to 10mH; ±10% tolerance; 0.1A to 2A; axial lead; color-coded like resistors
- Applications: RF chokes, audio crossovers, power supply filtering
I-Core / Drum-Core Wirewound Inductors (THT)
- 1µH to 1mH; high-current versions up to 10A; radial lead; power supply and motor drive
Toroidal Inductors
- High-efficiency; low EMI radiation; 10µH to 10mH; power supply and audio applications
Ceramic Chip Inductors (RF)
- 1nH to 100nH; 0402, 0603; RF impedance matching and filtering
Capacitors — Every Dielectric, Every Package
Capacitors are the most diverse passive component family. Our inventory covers 11 distinct capacitor types, from miniature SMD MLCCs to large AC motor-run capacitors:
(1) Radial Tantalum Capacitors
- THT radial; 0.1µF–100µF; 6.3V–35V; low ESR; audio and signal coupling
(2) AC Motor Run Capacitors
- Cylindrical can; 1µF–100µF; 250VAC–450VAC; CBB60/CBB65; motor start and run
(3) MKP Polypropylene Film Capacitors
- 0.001µF–10µF; 250V–1000V; ±1%, ±2%, ±5%; audio, power factor correction, snubber circuits
(4) Cement / Wirewound Resistors
- 2W–20W; ±5%; high-power braking, load, and current-limiting applications
(5) Green Polyester Film Capacitors (PET)
- 1nF–1µF; 63V–630V; ±10%; general purpose bypass, coupling, timing circuits
(6) SMD Tantalum Capacitors
- Case A/B/C/D; 0.1µF–330µF; 2.5V–35V; marked with capacitance code (e.g., 107 = 100µF)
(7) Red Polyester Film Capacitors
- 1nF–1µF; 100V–250V; compact radial; timing, coupling, bypass
(8) Large MLCC Capacitors
- 1812, 2220 package; 1nF–10µF; 500V–3kV; high-voltage snubber and EMI filter
(9) Glass Hermetic Capacitors
- Axial glass-sealed; 1pF–100pF; ±1%; military and aerospace grade; ultra-stable
(10) Green Polyester Box Capacitors
- 10nF–470nF; 63V–400V; ±5%, ±10%; PCB mount; audio and general purpose
(11) Electrolytic & CBB21 Film Capacitors
- Electrolytic: 1µF–100,000µF; 6.3V–450V; 85°C and 105°C; radial and snap-in
- CBB21 (Polypropylene): 1nF–10µF; 63V–630V; ±5%; low loss; audio and power supply
Through-Hole Transistors & Voltage Regulators
BJT Transistors — THT
- BC171B — NPN small-signal; TO-92; 45V, 100mA; low-noise audio and switching
- BC547 / BC548 / BC549 — NPN general purpose; TO-92; 45V–50V, 100mA
- BC557 / BC558 — PNP general purpose; TO-92; 45V–50V, 100mA
- 2N2222 / 2N2907 — NPN/PNP switching; TO-92, TO-18; 40V, 600mA
- 2N3904 / 2N3906 — NPN/PNP; TO-92; 40V, 200mA; industry standard
- TIP31C / TIP32C — NPN/PNP power; TO-220; 100V, 3A; audio output stage
- BD139 / BD140 — NPN/PNP medium power; TO-126; 80V, 1.5A
Voltage Regulators — Fixed & Adjustable
- L7808LC (8V) — TO-220; 1.5A; positive fixed; industrial and consumer power supply
- L78xx series: L7805 (5V), L7806 (6V), L7808 (8V), L7809 (9V), L7812 (12V), L7815 (15V), L7824 (24V)
- L79xx series: L7905 (−5V), L7912 (−12V), L7915 (−15V) — negative regulators
- LM317 — Adjustable 1.25V–37V; TO-220, TO-92; 1.5A; universal regulator
- LM337 — Adjustable negative; −1.25V to −37V; TO-220; 1.5A
- LM7805 / LM7812 — TO-220; 5V/12V; 1A; low-cost fixed regulator
NTC Thermistors
- 403Z and equivalents — Disc NTC; 40kΩ @ 25°C; inrush current limiting for power supplies
- 10kΩ, 47kΩ, 100kΩ @ 25°C; B-value 3380K–3950K; temperature sensing
Fuses — Glass Tube & Resettable
| Type | Size | Rating | Breaking Capacity |
|---|---|---|---|
| Glass tube fast-blow (F) | 5×20mm | 0.1A–30A; 250V | 35A @ 250VAC |
| Glass tube slow-blow (T) | 5×20mm | 0.1A–15A; 250V | 35A @ 250VAC |
| Ceramic tube | 6.3×32mm | 1A–30A; 500V | 1500A @ 500VAC |
| Resettable PTC fuse | SMD / THT | 0.05A–6A; 60V | Self-resetting |
| Blade fuse (automotive) | Mini / Standard / Maxi | 1A–40A; 32V | Automotive rated |
Component Size Reference — Real Scale Comparison
Understanding actual component dimensions is critical for PCB layout, enclosure design, and hand-assembly. Our size reference image shows common components against a millimeter ruler:
- Large QFP IC: ~28×28mm body; 0.8mm pitch leads; requires fine-pitch soldering
- SOP-16 IC: ~10×4mm body; 1.27mm pitch; hand-solderable
- SOD diode: ~3.5×1.7mm; SOD-123 package; smallest common diode
- SMD tantalum (yellow): Case B (3528); 3.5×2.8mm; visible polarity stripe
- SMD electrolytic: 6.3×5.4mm; V-chip; low-profile bulk storage
- SMD color-ring resistor: 0805 (2.0×1.25mm); readable color bands
- SMD inductor: 4040 shielded; 4.0×4.0mm; power inductor footprint
Who Buys Through-Hole Components from Keszoox
- 🔧 Board Repair Technicians — Replace failed capacitors, transistors, regulators, and fuses on consumer electronics, industrial PCBs, and power supplies
- 🔬 Electronics Hobbyists & Makers — Build circuits on breadboards and perfboards; through-hole components are hand-solderable without specialized equipment
- 🏫 University & Vocational Labs — Stock lab kits with resistors, capacitors, transistors, and LEDs for electronics fundamentals courses
- 🏭 Small-Batch Manufacturers — Wave-solder through-hole components for industrial control boards, power supplies, and audio equipment
- 💻 Vintage & Retro Electronics Restorers — Source NOS-equivalent through-hole components for vintage audio, radio, and computing restoration
- 🛠️ Field Service Engineers — Carry a component kit for on-site repair of industrial equipment and control panels
Frequently Asked Questions — Through-Hole Components
What is the difference between fast-blow and slow-blow fuses?
Fast-blow (F) fuses open immediately when the rated current is exceeded — ideal for protecting sensitive electronics. Slow-blow (T) fuses tolerate brief current surges (e.g., motor start-up inrush) before opening. Always match the fuse type to the load characteristics.
How do I identify the value of a film capacitor by its markings?
Film capacitors use a 3-digit code: the first two digits are significant figures, the third is the multiplier (number of zeros) in picofarads. For example, 104 = 10 × 10,000 = 100,000pF = 100nF = 0.1µF. Voltage rating is printed separately (e.g., 250V, 630V).
Can I substitute an SMD tantalum capacitor for a through-hole electrolytic?
In many cases yes, if the capacitance, voltage rating, and ESR requirements are met. SMD tantalum capacitors have lower ESR and smaller footprint but are polarity-sensitive and can fail short-circuit under voltage spikes. Consult the circuit requirements before substituting.
What is the L7808LC and what can it replace?
The L7808LC is a fixed +8V positive linear voltage regulator in TO-220 package, rated at 1.5A output current. It is pin-compatible with the full L78xx series and can replace any L7808 variant. Common applications include industrial sensor power rails, audio preamplifier supplies, and legacy industrial control boards.
Do you sell individual components or only in bulk?
Both. We sell individual components (single piece minimum) for repair and prototyping, as well as bulk quantities for production. Pricing scales with quantity — contact us for volume pricing on orders over 100 pieces per line item.
Are your through-hole components RoHS compliant?
Yes. All standard stocked through-hole components are RoHS 2.0 compliant (lead-free). If you require leaded (SnPb) components for specific applications (e.g., military, aerospace, or high-reliability wave soldering), contact us to check availability.
