{"product_id":"74hct245-octal-bus-transceiver-ic-dip20-ttl-compatible-3-state","title":"74HCT245 Octal Bus Transceiver IC DIP-20 – TTL-Compatible, 3-State, Bidirectional","description":"\u003ch2\u003e74HCT245 Octal Bus Transceiver IC – DIP-20, TTL-Compatible, 3-State\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e74HCT245\u003c\/strong\u003e is an octal (8-bit) bidirectional bus transceiver with TTL-compatible inputs and 3-state outputs – the TTL-input version of the popular 74HC245. The key difference: the 74HCT245 accepts TTL logic levels (VIH = 2.0V) at its inputs, making it the correct choice for interfacing 5V TTL logic with CMOS systems, or for level shifting between 3.3V and 5V systems when the driving side uses TTL thresholds. Eight bidirectional buffers with direction control (DIR) and output enable (̅O̅E̅) in a single DIP-20 package.\u003c\/p\u003e\n\n\u003ch3\u003eElectrical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 74HCT245 \/ SN74HCT245N \/ MC74HCT245AN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage:\u003c\/strong\u003e DIP-20 (through-hole, 2.54mm pitch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChannels:\u003c\/strong\u003e 8 (bidirectional)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupply Voltage:\u003c\/strong\u003e 4.5V – 5.5V (5V operation)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput Thresholds:\u003c\/strong\u003e TTL (VIH = 2.0V, VIL = 0.8V)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Drive Current:\u003c\/strong\u003e ±25mA per pin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePropagation Delay:\u003c\/strong\u003e ~10ns (typical at 4.5V)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirection Control (DIR):\u003c\/strong\u003e HIGH = A→B, LOW = B→A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Enable (̅O̅E̅):\u003c\/strong\u003e Active LOW – pull HIGH to tri-state all outputs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e −40°C to +125°C\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e74HCT245 vs 74HC245 – When to Use Each\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e74HC245:\u003c\/strong\u003e CMOS inputs (VIH = 0.7×VCC) – use when driving from CMOS logic (Arduino, ESP32)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e74HCT245:\u003c\/strong\u003e TTL inputs (VIH = 2.0V) – use when driving from 5V TTL logic or for 3.3V↔5V level shifting\u003c\/li\u003e\n  \u003cli\u003eBoth have identical output specifications and pinout\u003c\/li\u003e\n  \u003cli\u003eUse 74HCT245 when the input signal may not reach 0.7×VCC (e.g., 3.3V signal driving a 5V 74HC245)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eData bus buffering:\u003c\/strong\u003e Bidirectional 8-bit data bus isolation and buffering\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3.3V ↔ 5V level shifting:\u003c\/strong\u003e Interface 3.3V microcontrollers with 5V peripherals\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBus isolation:\u003c\/strong\u003e Separate bus segments with tri-state control\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTTL to CMOS interface:\u003c\/strong\u003e Buffer 5V TTL signals for CMOS systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMemory interface:\u003c\/strong\u003e Data bus buffering for SRAM and EEPROM\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 74HCT245 DIP-20 octal bus transceiver IC\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eEight bidirectional TTL-compatible buffers with 3-state outputs – the 74HCT245 is the correct choice for 5V TTL bus buffering and 3.3V↔5V level shifting in digital systems.\u003c\/p\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":45674455662827,"sku":"","price":5.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/74HCT245-Bus-Transceiver-with-3-State-Outputs.jpg?v=1723007474","url":"https:\/\/keszoox.com\/products\/74hct245-octal-bus-transceiver-ic-dip20-ttl-compatible-3-state","provider":"Keszoox","version":"1.0","type":"link"}