74LVC245 and 74LS245 Bus Transceiver ICs and Logic Kits

74LVC245 bus transceivers and related 245-series logic parts

Shop individual octal bus transceiver ICs, selected mixed logic-IC assortments and related interface components. The 74LVC245 name points to a particular low-voltage CMOS bus-transceiver family, but the actual listings here also include 74LS245, 74HC245, 74HCT245, 74CB3T3245 and other 74-series choices. Some later listings offer CAN-interface boards or unrelated components through mixed-model variants. The selected model and pack determine what is supplied. This is not a collection in which every item is an SN74LVC245 or an interchangeable 3.3 V-to-5 V breakout module.

Start with the exact logic family

74LVC245 / SN74LVC245A: Selected products list DIP-20 SN74LVC245AN, TSSOP-20 SN74LVC245APW/APWR and SOP/SOIC-20 74LVC245AD forms. These are bare eight-bit, noninverting, tri-state bidirectional bus-transceiver ICs for PCB or socket integration, not assembled voltage-conversion modules. Suffixes identify specific vendor, packaging and ordering forms; confirm exact marking, drawing and electrical specification before substituting parts. A seller's “new original” phrase does not establish provenance, authorization, inspection or traceable manufacturing.

74LS245: Numerous variants select SN74LS245N or HD74LS245P in DIP-20 and SN74LS245DWR/DM74LS245WM in surface-mount forms. LS is a different TTL logic family, with different supply, input-threshold and output characteristics from LVC. A 74LS245 selected option is not an LVC245 just because this collection's search term contains LVC. Some 74LS assortments combine it with counters, gates, latches and buffers in a stated kit; a single-chip variant in a multi-model parent listing is not the entire assortment.

74HC245 and 74HCT245: Additional choices include HC245D and HCT245D/PW/N packages. HC and HCT need separate threshold and supply checks: HCT is commonly selected where TTL-compatible input thresholds are important, but that does not make it a universal direct replacement for LS, HC or LVC at every voltage and load. Check output-current, timing and operating-voltage requirements against the exact suffix and vendor datasheet.

SN74CB3T3245: A ten-piece listing describes SN74CB3T3245PW/PWR in a surface-mount package. This is a bus-switch/translation architecture, not simply a repackaged 74LVC245 octal buffered transceiver. Examine signal path, pass behavior, enable/control and voltage limits before considering it for the same design.

Other 74-series functions: 74LS244, 74HC244 and 74LVC244 are buffers; 74LS373/374 and LVC373/374 are storage/latch or flip-flop functions; 74LVC540/541, 74LS273, 74LS247, 74HC595 and many other numbers describe their own logic functions. A selection such as “74LVC245APW TSSOP20” is one part; “74LVC244APW” is a different one. Similar 20-pin packages do not establish identical pin functions or supply limits.

How a 245-style bus interface works

A conventional 245-family octal transceiver presents eight A-side and eight B-side data paths. Its DIR input selects the intended transfer direction, while an output-enable control can put its outputs into a high-impedance state for bus sharing. Exact pin names and active polarity vary with the named device. This is direction-controlled bus transfer, not independent automatic direction sensing on every wire. If eight lines in one bus need different simultaneous directions, select an architecture that explicitly supports that arrangement rather than assuming a single DIR-controlled part can do it.

“Tri-state” means outputs can be disabled; it does not isolate grounds, convert a protocol, protect against surges or create a power rail. A bidirectional 245 chip does not infer which side is sending, and its output drive can be contested if external devices drive the enabled bus against it. Determine power-up default states for OE and DIR, allowable bus contention, decoupling and timing in the target design. Check input and output tolerances individually. An LVC device's use in a 3.3 V circuit does not automatically mean every input is 5 V tolerant under all power states; use the exact manufacturer's ratings, especially for powered-off and partial-power conditions.

Package and quantity are engineering specifications

DIP-20 variants suit a matching through-hole footprint or socket. TSSOP-20 and SOP/SOIC-20 offerings require different surface-mount land patterns and assembly processes; their similar “20” pin counts do not make the footprints interchangeable. Inspect case width, lead pitch, orientation, suffix and reel versus loose-piece packaging before designing a PCB. A listing that says “DIP-14” in a generic parent title can still contain a selected 20-pin 74LS245; the chosen part's datasheet and package marking govern its footprint, not the umbrella wording.

Pack choices shown across listings include 1, 5, 10, 20, 30, 50 and 100 pieces, with some multi-model assortments advertised as 25- or 50-piece sets. “5PCS-30PCS” does not mean 35 devices; choose either the 5PCS or 30PCS variant. A “50PCS/Set” listing may provide five each of ten distinct 74LS devices, not fifty 74LS245 chips. Conversely, a ten-piece listing with model options usually delivers the selected ten pieces of one part number, not all names in the title. Check the specific pack list and variant before ordering.

Other electronics currently represented in this collection

Some listings are broader than 245 bus transceivers. Mixed IC choices include 78xx/79xx linear regulators, audio and analog ICs, counters, MOSFETs and JFETs, logic gates, microcontrollers, memory devices and assorted 74-series chips. A variant marked “LM7805 TO-252,” “BF245B TO-92,” “L7905CV,” “STRX6759” or “BLF245” is that chosen part, not a 74LVC245. A used NUBM-series laser-module listing is also present; it is not a logic transceiver and must not be treated as a 245 device or casually integrated without product-specific safety assessment. Preserve this distinction even where a keyword match has placed the listing alongside logic chips.

CAN-related listings include TJA1050/TJA1051 transceiver ICs and modules, MCP2515-plus-TJA1050 controller boards, and an RS485/CAN HAT with a separately selectable MCP2515 module. A TJA1050 line transceiver handles the CAN electrical bus; an MCP2515 is a CAN controller communicating with a host over SPI. A module, bare SOP-8 IC, controller board and HAT are different delivered objects. None is a 74LVC245 octal parallel-bus transceiver or a plug-in substitute for its DIR/OE-controlled data bus. Select the actual CAN variant for a CAN application and verify board power, host interface and selected bundle independently; do not infer the HAT's RS-485 circuitry is included with an MCP2515-module-only variant.

Match part number to use case

1. For a parallel digital bus, identify the exact family (LVC, LS, HC, HCT or CB3T), transfer direction, output-enable behavior and I/O voltage domains. A “245” suffix alone is insufficient.
2. Decide whether the order should contain bare ICs or a mixed kit; read the selected part number and pack size before checkout. Most 245 products here are chips rather than preassembled converter boards.
3. Check data-direction and enable timing, voltage and threshold limits, output loading, bus contention and disabled-state behavior in the actual device datasheet. Do not transplant specifications between vendors or family variants.
4. Confirm package footprint and pinout from the exact ordering suffix, particularly DIP-20 versus SOP/SOIC-20 versus TSSOP-20, and distinguish buffers and latches from transceivers.
5. If you need a serial CAN controller, CAN physical-layer transceiver, voltage regulator or laser part, recognize those as separate product types and read the individual selected listing rather than using 74LVC245 guidance.
6. For repairs or substitutions, compare supply voltage, input threshold, output drive, propagation delay, maximum ratings and thermal conditions. Similar markings or pin counts are not proof of drop-in equivalence.

Frequently asked questions

Does every item contain 74LVC245? No. The selection ranges from LVC245 variants to LS/HC/HCT logic, mixed assortments and unrelated selected models, including CAN-interface hardware. Follow the exact option.

Can I use 74LS245 in place of 74LVC245? Not without a full electrical review. The logic families differ in supply and threshold behavior; pin similarity alone does not establish system compatibility.

Is 74LVC245 an automatic bidirectional level shifter? No. A typical 245 transceiver needs DIR and output-enable control. Choose a different architecture if independent automatic direction sensing is required.

Is a TSSOP-20 chip a ready-made module? No. A bare surface-mount IC needs a compatible PCB footprint and supporting circuit. A DIP-20 option likewise needs appropriate integration.

Will a “50-piece kit” give me fifty 74LS245 devices? Not necessarily. Some specified sets contain several distinct 74LS functions in smaller quantities each; check the particular kit contents.

Can a TJA1050 or MCP2515 CAN board replace a 74LVC245? No. CAN line transceivers and controllers perform different jobs from an eight-bit parallel bus transceiver.

Does a title mentioning many chips mean they all ship? Usually those names denote variant choices. The selected model, package and quantity identify the deliverable, except where a specific kit's packing list explicitly names multiple included parts.

Use this collection as a component-discovery starting point, then confirm the selected model's marking, packaging and manufacturer-level electrical requirements before specifying it in a circuit.