CD4503BE Texas Instruments Logic Buffer/Driver ICs (PDIP-16) In Stock
CD4503BE is a CMOS 6-bit non-inverting 3-state buffer and line driver by Texas Instruments in the 4000 family. Key specs: 3 V to 18 V supply, 50 pF load capacitance, active-low enable, 16-pin DIP package. From $0.35, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- PDIP-16
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD4503BE Datasheet PDF
- Category
- Logic Buffer/Driver ICs
- Price
- From $0.4243(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 CD4503BE?
- 6-bit non-inverting 3-state buffer with active-low enable, allowing bus sharing across multiple drivers without contention
- Wide 3 V to 18 V supply range covering both legacy 5 V TTL-compatible and modern 3.3 V CMOS logic systems
- Rated for 50 pF load capacitance with 11.2 mA output sink current, ensuring reliable bus drive in noisy industrial environments
What is CD4503BE used for?
The CD4503BE is commonly used as a bus driver and line buffer in microprocessor and microcontroller systems where multiple devices share a common data or address bus, requiring tri-state control to prevent bus conflicts. Its wide 3 V to 18 V supply range makes it particularly useful in legacy industrial control panels, programmable logic controllers, and mixed-voltage backplane designs that combine older CMOS logic with newer 3.3 V subsystems. The device also serves as a level interface and fan-out buffer in test and measurement equipment needing controlled output enable.
What are the specifications of CD4503BE?
| YTEOL | 15 |
| Additional Feature | ONE FUNCTION WITH TWO BITS |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | 4000/14000/40000 |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.0112A |
| Number of Bits | 4 |
| Number of Functions | 6 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.12mA |
| Prop. Delay@Nom-Sup | 150ns |
| Propagation Delay (tpd) | 150ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 18V |
| Supply Voltage-Min (Vsup) | 3V |
| 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 | PDIP-16 |
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 CD4503BE datasheet?
CD4503BE Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD4503BE?
Compatible alternatives and drop-in replacements for CD4503BE:
Bus Driver, 4000/14000/40000 Series, 6-Func, 4-Bit, True Output, CMOS, PDIP16
Frequently Asked Questions
What supply voltage range does the CD4503BE support and why does that matter for legacy system integration?
The CD4503BE operates from 3 V to 18 V, covering both the 5 V TTL-compatible range used in legacy industrial PLCs and the 3.3 V domain common in modern CMOS designs. This makes it one of the few 6-bit buffers that can bridge mixed-voltage backplanes without external level shifters, reducing BOM complexity when retrofitting older 15 V CMOS logic boards with 5 V subsystems.
How does the active-low enable on the CD4503BE prevent bus contention in multi-driver designs?
When the active-low enable pin is driven high, all 6 output channels enter the high-impedance (tri-state) condition, effectively disconnecting the CD4503BE from the bus within nanoseconds. This allows multiple bus drivers to share a 6-bit data or address bus by asserting only one enable at a time, preventing short-circuit currents that would otherwise occur if two 11.2 mA sink-capable outputs drove opposing logic levels simultaneously.
For a 16-bit parallel data bus, how many CD4503BE devices are required and how are they typically wired?
A 16-bit parallel bus requires 3 CD4503BE devices: two handling 6 bits each and one providing the remaining 4 bits (with 2 unused channels tied off). Each device's enable pin is connected to the same bus-enable control signal, ensuring all 16 lines switch to high-impedance or active drive simultaneously. The 16-pin DIP footprint of each device occupies roughly 100 mm² per device on through-hole PCBs.
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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+ | $0.5890 | $0.59 |
| 9+ | $0.4712 | $4.24 |
| 25+ | $0.4500 | $11.25 |
| 93+ | $0.4243 | $39.46 |
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