Passive & Discrete Components — Resistors, Capacitors, Inductors, MOSFETs, Transistors | BOM Procurement Service

Passive & Discrete Electronic Components — One Source, Every Value, Every Package

Keszoox stocks a comprehensive range of passive and discrete semiconductor components covering resistors, capacitors, inductors, MOSFETs, transistors, diodes, and power management ICs. Whether you are building a prototype, running a production BOM, or sourcing a hard-to-find replacement part, our warehouse holds millions of line items ready for same-day dispatch. Every component is 100% original, sourced directly from authorized channels, and passes our strict multi-stage quality control before shipment.

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Core Product Portfolio — Six Component Families

Component Family	Key Types	Common Packages	Typical Applications
Resistors	Thick-film chip, thin-film precision, wirewound, metal film, current sense, thermistor (NTC/PTC)	0201, 0402, 0603, 0805, 1206, 2512, TO-92, axial	Current limiting, voltage dividers, pull-up/pull-down, sensing, filtering
Capacitors	MLCC ceramic, electrolytic (Al), tantalum, film (PP/PET), supercapacitor (EDLC)	0201, 0402, 0603, 0805, 1206, radial, SMD can	Decoupling, filtering, energy storage, timing, power factor correction
Inductors	Power inductor (shielded/unshielded), ferrite bead, common-mode choke, toroidal, wirewound	0402, 0603, 0805, 1210, 1812, radial, SMD drum	DC-DC converters, EMI suppression, RF filtering, energy storage
MOSFETs	N-channel, P-channel, dual-channel, logic-level gate, high-voltage, ultra-low Rds(on)	SOT-23, SOT-223, TO-220, TO-252 (DPAK), TO-263 (D2PAK), SOP-8	Motor drive, power switching, synchronous rectification, load switching
Transistors & Diodes	NPN/PNP BJT, Schottky diode, Zener diode, TVS diode, rectifier diode, fast recovery diode	SOT-23, TO-92, TO-220, SMA, SMB, SMC, DO-41	Signal amplification, voltage clamping, ESD protection, rectification
Power Management ICs	LDO regulators, DC-DC buck/boost converters, PMIC, gate drivers, voltage references	SOT-23-5, SOT-223, TO-220, SOP-8, TSSOP-20, QFN-16	Power rails, battery management, LED drivers, motor control

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Resistors — Precision, Power & Specialty

Chip Resistors (SMD)

Size Code	Dimensions (mm)	Power Rating	Resistance Range	Tolerance
0201	0.6 × 0.3	1/20 W	1Ω – 10MΩ	±1%, ±5%
0402	1.0 × 0.5	1/16 W	0Ω – 10MΩ	±0.1%, ±1%, ±5%
0603	1.6 × 0.8	1/10 W	0Ω – 10MΩ	±0.1%, ±1%, ±5%
0805	2.0 × 1.25	1/8 W	0Ω – 10MΩ	±0.1%, ±1%, ±5%
1206	3.2 × 1.6	1/4 W	0Ω – 10MΩ	±1%, ±5%
2512	6.3 × 3.2	1 W	0.01Ω – 1Ω (current sense)	±1%

• 🔬 Thin-film precision — ±0.1% tolerance, ±25 ppm/°C TCR; ideal for instrumentation and ADC reference circuits
• 🌡️ NTC thermistors — 1kΩ–100kΩ; temperature sensing for battery management and HVAC
• ⚡ Current sense resistors — 1mΩ–100mΩ; 4-terminal Kelvin connection; AEC-Q200 qualified grades available
• 🔌 Wirewound power resistors — 1W–50W; TO-220 and axial packages; high-pulse capability

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Capacitors — Ceramic, Electrolytic, Tantalum & Film

MLCC Ceramic Capacitors

Dielectric	Capacitance Range	Voltage Range	Temperature Stability	Best Use
C0G / NP0	0.5pF – 100nF	16V – 2kV	±30 ppm/°C (Class I)	RF, timing, precision filtering
X5R	100pF – 100µF	4V – 50V	±15% (–55°C to +85°C)	Decoupling, bypass, general purpose
X7R	100pF – 47µF	4V – 100V	±15% (–55°C to +125°C)	Industrial decoupling, automotive
Y5V	1nF – 100µF	4V – 25V	+22%/–82%	Bulk bypass, non-critical filtering

Electrolytic & Specialty Capacitors

• 🔋 Aluminum electrolytic — 1µF–10,000µF; 6.3V–450V; radial and SMD can; low-ESR grades for switching power supplies
• 💜 Supercapacitors (EDLC) — 0.1F–500F; 2.7V–5.5V; coin cell and cylindrical; energy backup and pulse power
• 🟤 Tantalum capacitors — 0.1µF–1000µF; 2.5V–50V; MnO₂ and polymer types; ultra-low ESR
• 🟡 Film capacitors — PP and PET; 1nF–100µF; 50V–2kV; high-frequency and power factor correction

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Inductors & Magnetics

Type	Inductance Range	Current Rating	Package	Application
Shielded power inductor	0.1µH – 1000µH	0.1A – 30A	0402 – 1812 SMD	DC-DC buck/boost converters
Unshielded power inductor	1µH – 10mH	0.05A – 10A	SMD drum core	General power filtering
Ferrite bead	10Ω – 2kΩ @ 100MHz	0.1A – 6A	0201 – 1206	EMI suppression, power line filtering
Common-mode choke	1mH – 100mH	0.1A – 10A	SMD, through-hole	Differential noise suppression, USB/HDMI lines
Toroidal inductor	1µH – 100mH	1A – 50A	Through-hole radial	High-current power supplies, PFC

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MOSFETs — N-Channel, P-Channel & Dual

Type	Vds Range	Id Range	Rds(on) Typical	Package
N-channel (low voltage)	20V – 60V	1A – 100A	1mΩ – 50mΩ	SOT-23, TO-252, TO-220
N-channel (high voltage)	100V – 1200V	1A – 50A	50mΩ – 5Ω	TO-220, TO-247, D2PAK
P-channel	–20V – –100V	–1A – –30A	20mΩ – 500mΩ	SOT-23, SOT-223, TO-252
Logic-level gate	20V – 60V	1A – 30A	5mΩ – 100mΩ	SOT-23, SOP-8, TO-252
Dual N+P (complementary)	20V – 60V	±1A – ±8A	50mΩ – 300mΩ	SOT-363, SOP-8, TSSOP-8

• ⚡ Ultra-low Rds(on) — Sub-1mΩ N-channel devices for synchronous rectification in high-efficiency converters
• 🚗 AEC-Q101 automotive grade — Qualified for –40°C to +175°C junction temperature; PPAP documentation available
• 🔒 ESD-protected gate — Built-in Zener gate protection on logic-level devices

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Transistors & Diodes

Bipolar Junction Transistors (BJT)

• NPN general purpose: 2N2222, BC547, S8050, MMBT3904 — SOT-23, TO-92; Vceo up to 40V, Ic up to 600mA
• PNP general purpose: 2N2907, BC557, S8550, MMBT3906 — SOT-23, TO-92; complementary pairs available
• NPN high-voltage: MJE13003, 2SC5200 — TO-220, TO-3P; Vceo up to 400V; switching and audio power
• Darlington pair: TIP120, TIP122 — TO-220; high current gain; relay and motor drive

Diodes

Diode Type	Key Parameter	Package	Application
Schottky rectifier	Vf = 0.2–0.4V; Trr < 10ns	SOD-123, SMA, SMB, TO-220	High-frequency rectification, reverse polarity protection
Zener diode	Vz = 2.4V – 200V; ±1% tolerance	SOD-123, SOD-323, DO-35, DO-41	Voltage regulation, reference, clamping
TVS diode	Unidirectional & bidirectional; 5V – 400V	SOD-123, SMA, SMB, SMC	ESD protection, transient suppression
Fast recovery diode	Trr < 200ns; If up to 30A	TO-220, TO-247, SMB	Freewheeling, snubber circuits, PFC
Bridge rectifier	1A – 50A; 50V – 1000V	DIP-4, GBU, KBPC	AC-DC power supply front-end

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Power Management ICs — PMIC, DC-DC & LDO

IC Type	Key Specs	Package	Application
LDO linear regulator	Vin up to 40V; Iout 100mA–5A; Vdropout < 300mV	SOT-23-5, SOT-223, TO-220, TO-252	Low-noise power rails, post-regulation
DC-DC buck converter	Vin 4.5V–60V; Iout 0.5A–20A; η > 90%	SOP-8, TSSOP-20, QFN-16, TO-263	Step-down regulation, battery-powered systems
DC-DC boost converter	Vin 0.9V–40V; Vout up to 60V; Iout 0.1A–5A	SOT-23-5, SOP-8, QFN-10	LED drivers, USB charging, battery boost
PMIC (multi-rail)	3–8 output rails; I²C/SPI programmable	QFN-24 to QFN-64, WLCSP	SoC power sequencing, IoT modules
Gate driver IC	4A–10A peak; 5ns–50ns propagation delay; bootstrap	SOP-8, SOIC-8, DIP-8	MOSFET/IGBT drive in inverters and converters
Voltage reference	1.25V–10V; ±0.05% initial accuracy; 5 ppm/°C	SOT-23-3, SOT-23-5, TO-92, DIP-8	ADC/DAC reference, precision measurement

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Why Choose Keszoox for Passive & Discrete Components?

#	Advantage	What It Means for You
01	Technical Datasheet	Full manufacturer datasheet provided for every part number — no guesswork on specs
02	100% Original Parts	Direct authorized supply chain; zero-tolerance counterfeit policy; CoC included
03	PCB & PCBA Support	Component-level support for PCB assembly projects; BOM-to-board consultation available
04	Chip Replacement Service	Cross-reference and alternate sourcing for obsolete, EOL, or allocated components
05	In Stock, Fast Delivery	Millions of line items in warehouse; same-day dispatch; DHL/FedEx/UPS express available
06	Strict QC Testing	Multi-stage incoming inspection: visual, parametric, and AOI — every batch tested
07	Technical Support	Engineering team available for component selection, cross-reference, and application guidance
08	After-Sales Service	Dedicated account manager; replacement guarantee; full traceability on every shipment

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BOM List Procurement — One-Stop Solution, Save Time & Cost

Managing a multi-line BOM across dozens of suppliers wastes engineering time and inflates procurement cost. Keszoox consolidates your entire passive and discrete component BOM into a single purchase order, single shipment, and single point of contact.

1. Upload Your BOM — Send your Excel or CSV BOM with part numbers, quantities, and any preferred brands
2. Instant Quote & Alternative Suggestions — Line-by-line pricing within 24 hours; approved alternates offered for hard-to-find or over-priced parts
3. You Approve, We Deliver — Confirm the quote; we pick, inspect, kit, and ship — consolidated in one box
4. Strict Pre-Shipment Inspection — Every component re-verified against your BOM before packing
5. 100% Quality Guaranteed — Full replacement warranty; CoC and test reports included
6. Professional After-Sales Service — Dedicated support for any post-delivery queries or replacements

BOM Complexity	Line Items	Turnaround	Service Level
Prototype / R&D	1–30 lines	Same-day quote	Full stock match + datasheet pack
NPI / Pilot	30–150 lines	24–48 hours	BOM match + alternate suggestions
Small Production	150–500 lines	2–5 days	Full BOM analysis + hard-to-find sourcing
Volume Production	500+ lines	By agreement	Dedicated sourcing team + VMI option

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Technical Datasheet & Contact

Every component supplied by Keszoox comes with the full manufacturer technical datasheet — including electrical characteristics, package dimensions, land pattern, and application notes. For complex or specialty parts, our engineering team can provide additional application support and cross-reference documentation.

• 📄 Datasheet on request — Available for all stocked part numbers; delivered with your order confirmation
• 🔄 Cross-reference service — Submit a competitor part number; we identify the equivalent or superior alternative
• 📐 Land pattern & footprint files — Available for common SMD packages on request
• 🧪 Test reports — Batch-level parametric test data available for critical components

📩 Contact us for your BOM quote today — response within 24 hours, worldwide shipping to 100+ countries.

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Frequently Asked Questions

What is the minimum order quantity (MOQ) for passive components?

MOQ is 1 piece for most discrete components. Cut-tape minimum is typically 10 pieces for SMD resistors and capacitors. Full reel orders available for production volumes.

Can you supply AEC-Q200 / AEC-Q101 automotive-grade components?

Yes. We stock AEC-Q200 qualified passive components (resistors, capacitors, inductors) and AEC-Q101 qualified discrete semiconductors (MOSFETs, diodes, transistors) for automotive applications. PPAP documentation available on request.

Do you offer chip replacement / cross-reference for obsolete parts?

Yes. Our chip replacement service identifies functional equivalents for obsolete, EOL, or allocated components. Submit the original part number and we will provide a qualified alternate with full datasheet comparison.

How do I submit a BOM for quotation?

Send your BOM in Excel or CSV format via our contact page or email. Include part numbers, quantities, and any preferred brands or date code requirements. We will return a line-by-line quote within 24 hours.

What quality certifications do you hold?

Keszoox operates under ISO 9001 quality management. Third-party lab testing is available through SGS and Bureau Veritas accredited facilities. All shipments include a Certificate of Conformance (CoC).

Enjoy free standard shipping on all orders over $199 USD. Orders are processed within 1–2 business days.

Not satisfied? Return any item within 90 days of purchase for a full refund or exchange. Items must be in original condition.

We are committed to quality, reliability, and customer satisfaction. Every product is carefully selected and tested to meet the highest standards.