CD74HC243E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The CD74HC243E is a high-speed CMOS quad bidirectional bus transceiver with 3-state outputs and independent output-enable control for each direction, rated for a 50 pF load capacitance. It is housed in a 14-pin PDIP package ideal for through-hole prototyping. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 14
- Lifecycle
- ACTIVE
- Datasheet
- CD74HC243E Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.3611(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 CD74HC243E?
- Quad bidirectional 3-state outputs with independent direction enables for flexible bus sharing
- HC/UH CMOS family delivers high-speed switching with low quiescent current for power-sensitive designs
- 14-pin PDIP package with 50 pF load capacitance supports reliable signal integrity on shared data buses
What is CD74HC243E used for?
The CD74HC243E is used in microprocessor and microcontroller systems where bidirectional data buses must be shared among multiple peripherals, with independent enable control preventing bus contention. It fits naturally into backplane designs, memory-expansion boards, and FPGA development platforms that require buffered 3-state interfaces. The device also supports legacy 5 V CMOS system upgrades where through-hole PDIP components remain preferred for reworkability.
What are the specifications of CD74HC243E?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | WITH INDEPENDENT OUTPUT ENABLE FOR EACH DIRECTION |
| Control Type | INDEPENDENT CONTROL |
| Count Direction | BIDIRECTIONAL |
| Family | HC/UH |
| JESD-30 Code | R-PDIP-T14 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS TRANSCEIVER |
| Max I(ol) | 0.0078A |
| Number of Bits | 4 |
| Number of Functions | 4 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP14,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 20ns |
| Propagation Delay (tpd) | 135ns |
| Qualification Status | Not Qualified |
| Schmitt Trigger | NO |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 4.5V |
| 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, Mexico |
Where can I find the CD74HC243E datasheet?
CD74HC243E Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HC243E?
Compatible alternatives and drop-in replacements for CD74HC243E:
Bus Transceiver, HC/UH Series, 4-Func, 4-Bit, True Output, CMOS, PDIP14
Frequently Asked Questions
How does the independent output-enable control of the CD74HC243E prevent bus contention in shared-bus designs?
The CD74HC243E provides separate output-enable pins for each of the two data-flow directions, so the designer can disable one direction before enabling the other, ensuring no two drivers fight over the same bus line simultaneously. This architecture supports robust 50 pF load bus sharing in systems with multiple masters or mixed-direction data transfers without requiring external arbitration logic.
What load capacitance and logic-family characteristics make the CD74HC243E suitable for high-speed backplane applications?
The CD74HC243E is rated for a 50 pF load capacitance and belongs to the HC/UH CMOS family, which delivers propagation delays typically under 10 ns at 5 V supply. These characteristics allow it to drive moderate-length PCB traces on shared backplanes in industrial controllers and embedded systems, where fast 3-state switching is needed to multiplex 4 data channels between devices.
When is the 14-pin PDIP package of the CD74HC243E a practical choice compared to surface-mount alternatives?
The 14-pin PDIP package is preferred during prototype and evaluation phases because it inserts directly into breadboards and through-hole PCBs without soldering, enabling rapid circuit validation. It also suits low-volume production in industrial or laboratory equipment where rework and manual assembly are common, and where the 50 pF-rated quad bus transceiver function must be verified before committing to a smaller SMD footprint.
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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+ | $0.4920 | $0.49 |
| 11+ | $0.4100 | $4.51 |
| 100000+ | $0.3611 | $36110.00 |
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