CD74ACT245E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
Texas Instruments CD74ACT245E is an octal bidirectional non-inverting bus transceiver with 3-state outputs and direction control, operating from a 5 V supply in a 20-pin DIP package. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- CD74ACT245E Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4977(MOQ 1)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74ACT245E?
- 8 bidirectional non-inverting channels with a single DIR pin controlling simultaneous data-flow direction for all 8 bits, simplifying bus arbitration logic
- ACT-family CMOS with TTL-compatible input thresholds enables direct bridging between 5 V CMOS buses and legacy 5 V TTL systems without level-shifting
- 3-state outputs on all 8 channels allow multiple transceivers to share the same bus lines with a common OE (output enable) signal for wired-OR bus architectures
- 20-pin DIP through-hole package suits prototyping and repair applications where breadboard compatibility and hand-soldering access are required
What is CD74ACT245E used for?
The CD74ACT245E is used in microprocessor data bus buffering where 8 bidirectional channels with direction control isolate a CPU's local bus from a high-capacitance system bus, preventing signal degradation across backplane connectors or ribbon cables. Its TTL-compatible ACT-family inputs make it ideal for interfacing legacy 5 V TTL bus masters with CMOS memory or I/O expansion devices in industrial control systems and test equipment. PCB designers also use it in address/data multiplexed bus circuits for FPGA development boards where on/off bus access is controlled by a single OE signal per transceiver.
What are the specifications of CD74ACT245E?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | WITH DIRECTION CONTROL |
| Control Type | COMMON CONTROL |
| Count Direction | BIDIRECTIONAL |
| Family | ACT |
| JESD-30 Code | R-PDIP-T20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS TRANSCEIVER |
| Max I(ol) | 0.024A |
| Number of Bits | 8 |
| Number of Functions | 8 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 8.7ns |
| Propagation Delay (tpd) | 10ns |
| Qualification Status | Not Qualified |
| Schmitt Trigger | NO |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia |
Where can I find the CD74ACT245E datasheet?
CD74ACT245E Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74ACT245E?
Compatible alternatives and drop-in replacements for CD74ACT245E:
Frequently Asked Questions
How does the DIR pin of the CD74ACT245E control data flow across all 8 channels simultaneously?
The DIR (direction) pin is a common control shared across all 8 channels of the CD74ACT245E. When DIR is HIGH, data flows from the A-side inputs to the B-side outputs (A→B). When DIR is LOW, data flows from B-side inputs to A-side outputs (B→A). Toggling DIR in under 5 ns (ACT propagation delay) reverses all 8 channels simultaneously, enabling rapid bus turnaround in bidirectional memory and peripheral bus designs.
What advantage does the ACT family offer over the HC family for a mixed TTL and CMOS 5 V bus interface?
The ACT family uses TTL-compatible input thresholds (V_IH = 2 V minimum) rather than the CMOS thresholds of the HC family (V_IH = 3.15 V at 4.5 V). This means ACT devices reliably accept signals from 74LS and 74S TTL outputs with output high levels as low as 2.4 V, whereas HC parts may interpret TTL HIGH levels as indeterminate near their CMOS threshold. The CD74ACT245E therefore bridges 5 V TTL-output bus masters directly to CMOS-input peripherals without active level translation.
What is the output drive capability of the CD74ACT245E, and how many TTL loads can it drive per channel?
The CD74ACT245E provides a minimum output sink current of 24 mA at V_OL = 0.55 V (5 V supply, 50 pF load), which is sufficient to drive approximately 12 standard TTL loads (each drawing 2 mA) per channel. Its source current of 15 mA supports up to 7 LSTTL loads per output. This drive strength is well above what a typical CMOS gate can deliver, making the CD74ACT245E effective for buffering heavily loaded data buses in backplane and cable-drive applications.
When should the CD74ACT245E OE pin be used rather than relying solely on DIR for bus isolation?
The OE (output enable, active LOW) pin forces all 8 output channels into a high-impedance 3-state mode regardless of the DIR setting. It is used when the transceiver must release the bus entirely — for example, during DMA transfers when a second bus master takes control of the shared 8-bit data bus. DIR controls data direction only when OE is asserted; OE removes the transceiver from the bus completely, preventing contention between multiple drivers sharing the same bus lines.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.7700 | $0.77 |
| 100+ | $0.5800 | $58.00 |
| 1000+ | $0.5000 | $500.00 |
| 100000+ | $0.4977 | $49770.00 |
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