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JLCPCB’s component library is very large and live-updated, not a short fixed list. As of May 11, 2026, JLCPCB’s public All Components catalog shows 7,146,847 total results, while the PCBA-oriented SMT Parts Library view shows 669,297 items in total; the exact number you see depends on which page and filters are active. JLC Assembly classifies usable parts as Basic, Preferred, and Extended. Extended parts carry a $3 loading fee per part, while Basic and Preferred do not. (jlcpcb.com)
In practical terms, the library includes almost every category needed for typical PCB assembly: resistors, capacitors, inductors, crystals, diodes, transistors, power ICs, microcontrollers, logic, memory, interface ICs, connectors, relays, sensors, optoelectronics, RF/wireless modules, and signal-isolation parts. It also contains some ancillary/non-core categories such as hardware fasteners, consumables, tool equipment, and global-sourcing entries. (jlcpcb.com)
The most useful way to think about JLCPCB’s library is by major functional families rather than by individual manufacturer part numbers. The official catalog currently exposes these broad electronics categories: Capacitors, Resistors, Circuit Protection, Clock/Timing, Connectors, Crystals/Oscillators/Resonators, Embedded Processors & Controllers, Filters, Interface, IoT/Communication Modules, Logic, Memory, Power Management (PMIC), Relays, RF and Wireless, Sensors, Signal Isolation Devices, Switches, Transistors/Thyristors, Optoelectronics, plus several auxiliary sourcing categories. (jlcpcb.com)
A current snapshot of the library breadth from JLCPCB’s own category page looks like this: Resistors: 1,557,828, Connectors: 1,679,518, Capacitors: 1,008,517, Crystals/Oscillators/Resonators: 924,436, Power Management (PMIC): 181,349, Circuit Protection: 160,681, Transistors/Thyristors: 112,933, Optoelectronics: 83,478, Embedded Processors & Controllers: 79,563, Memory: 48,512, Logic: 47,960, Interface: 40,531, Sensors: 40,087, Filters: 41,458, Relays: 30,536, and IoT/Communication Modules: 5,850. These are catalog counts, not a guarantee that every item is suitable for every assembly service. (jlcpcb.com)
More concretely, here is what is available:
| Family | Examples visible in JLCPCB catalog |
|---|---|
| Passive parts | MLCC SMD capacitors, electrolytics, tantalums, film capacitors, chip resistors, current-sense resistors, resistor arrays, ferrite beads, common-mode filters, EMC/EMI filters, inductors, trimmers, resonators, oscillators, RTC/clock parts |
| Discretes | Schottky diodes, Zeners, switching diodes, bridge rectifiers, BJTs, digital transistors, Darlington devices, thyristor-family parts |
| ICs | op-amps/comparators, PMICs, DC-DC converters, LDOs, supervisors/reset ICs, voltage references, CAN/LIN/RS-232/RS-485/USB/Ethernet interface ICs, logic families, memory, MCU/MPU/SoC devices, DSP/DSC, CPLD/FPGA |
| Connectivity / electromechanical | pin headers, board-to-board connectors, FFC/FPC, USB, RJ45/RJ11, coax/RF connectors, terminal blocks, relays |
| Sensing / optical / wireless | temperature/humidity sensors, pressure sensors, image sensors, optocouplers, discrete LEDs, RGB LEDs, infrared emitters/receivers, Bluetooth modules, LoRa modules, GNSS modules, cellular modules, RF modules |
This summary is directly consistent with the live category and subcategory structure shown on JLCPCB’s catalog pages. (jlcpcb.com)
The Basic / Preferred / Extended distinction matters more than the raw category list when you are actually designing for JLC assembly. JLCPCB states that JLC Assembly has three types of parts: Basic, Preferred (sometimes called Extended Preferred), and Extended. The practical consequence is cost and setup behavior: Extended parts require a $3 loading fee per part, whereas Basic and Preferred do not. (jlcpcb.com)
The biggest current takeaway is that the library is dynamic. JLCPCB’s own help article explicitly instructs users to search by category or combination keywords and then check inventory availability and price sorting, because stock and visible matches are live-search dependent. (jlcpcb.com)
Another important current point is that older web posts quoting a single number such as “100k+”, “300k+”, or “680k+” are only snapshots. JLCPCB’s official pages now show multiple live figures depending on context: the broader catalog shows 7,146,847 total results, while the SMT/PCBA-facing search view shows 669,297 items in total. The correct engineering interpretation is: use the live JLC search and BOM tools, not stale blog numbers, when selecting production parts. (jlcpcb.com)
JLCPCB also supports a workflow where you can pre-order components, store them in a private parts library at no inventory cost, and use the BOM tool to check real-time prices and availability before assembly. (jlcpcb.com)
From a PCB designer’s perspective, the library is best treated as a manufacturing-qualified sourcing database. You do not merely ask “does JLC have a 10 kΩ resistor?”; you ask “does JLC have the exact package, tolerance, dielectric, voltage rating, lifecycle tier, and stock status I need for assembly?” JLC’s help documentation reflects this by recommending filtered searches by category and parameter, or a combined keyword search such as package + value + manufacturer. (jlcpcb.com)
For example:
One subtle but important point: the public catalog is broader than just “classic SMT parts.” It includes global sourcing parts, pre-ordered parts, and several non-electronic or support categories. So if your question is specifically about what can JLC assemble on a PCB, the answer is narrower than the raw “All Components” catalog count. That is why the PCBA-only framing and the Basic/Preferred/Extended tags matter. (jlcpcb.com)
The main practical/legal constraint is that JLCPCB’s parts ordering flow is for PCB assembly orders only; JLC states that parts ordered there cannot be shipped separately and pickup is not supported. For engineering teams, this affects procurement planning, traceability, and whether JLC is being used as an assembler versus a standalone distributor. (jlcpcb.com)
If your real question is “what should I use from JLC’s library for a buildable design?”, the best workflow is:
A good engineering rule is: choose the part by assembly compatibility first, then by electrical fit, then by cost. With JLCPCB, this usually means checking package, stock, tier, and service applicability before finalizing the schematic symbol field for the BOM. (jlcpcb.com)
The library is large enough that no static answer can list “all available parts.” The only precise answer is the live JLC catalog at the moment you search it. Also, different official JLC pages show different totals because they represent different scopes and filters, so any single count should be treated as a date-specific snapshot, not a permanent specification. (jlcpcb.com)
If you want a more actionable answer, I can help in one of these more engineering-useful ways:
Those are usually more valuable than a generic library overview.
JLCPCB’s library contains a very broad range of PCB-assembly parts, including passives, discretes, ICs, connectors, relays, sensors, optoelectronics, RF/wireless, and communication modules. Official pages currently show millions of catalog entries overall and hundreds of thousands in the PCBA-oriented search view, with part availability changing live. For actual production work, the key practical distinction is Basic vs Preferred vs Extended, because that affects assembly fees and manufacturability. (jlcpcb.com)
If you want, I can next give you a designer-focused list of the most useful JLC categories or help you find specific JLC-basic parts for your project.