Texas Instruments CD4503BEE4

Overview

CD4503BEE4 from Texas Instruments is a hex noninverting buffer IC with 3-state outputs, high sink- and source-current capability (±24 mA at V_DD = 15 V), dual independent output-enable controls (OE1 for buffers 1–4, OE2 for buffers 5–6), and operates across -55°C to +125°C. It serves as a level-shifting bus interface in mixed-voltage digital systems.

For engineers reviewing the CD4503BEE4 datasheet, CD4503BEE4 pinout, CD4503BEE4 application, or CD4503BEE4 equivalent, key selection factors include its dual enable architecture, wide supply range (3 V to 18 V), TTL/CMOS compatibility, and PDIP-16 packaging for prototyping and legacy industrial control designs.

Technical Context

The CD4503BEE4 implements six independent noninverting buffer stages, each with three-state output control. Its dual enable inputs (OE1, OE2) allow grouped output disabling-four buffers controlled by OE1, two by OE2-enabling selective bus isolation without external logic.

Designed for CMOS logic families, it features high noise immunity (V_IL = 0.33×V_DD, V_IH = 0.67×V_DD), rail-to-rail output swing, and input thresholds compatible with both TTL and CMOS voltage levels across its full 3 V–18 V supply range.

Key Specifications

Pinout & Package

CD4503BEE4 is supplied in a 16-lead plastic dual-in-line package (PDIP-16, package drawing N), with 0.3-inch body width and standard through-hole mounting footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex noninverting buffer applications.

Compared with CD4503BEE4, CD4050BE lacks 3-state capability and current drive, limiting bus-sharing use; SN74HC244N offers faster switching but sacrifices supply flexibility and temperature range-making CD4503BEE4 uniquely suited for mixed-voltage, high-reliability industrial interfaces.

Availability

CD4503BEE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, mixed-voltage sensor hubs, and legacy test equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant PDIP packaging.

Supply support for CD4503BEE4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The CD4503BEE4 belongs to TI's legacy CMOS logic portfolio, designed specifically for robust, wide-supply-range interfacing in harsh-environment control systems where reliability and voltage flexibility outweigh raw speed requirements.

FAQ

What is the maximum supply voltage rating for CD4503BEE4?

The CD4503BEE4 is rated for operation up to 18 V DC on V_DD, with guaranteed performance across the full -55°C to +125°C temperature range. Exceeding 18 V risks permanent damage to the internal oxide layers. The CD4503BEE4 datasheet specifies absolute maximum ratings and recommended operating conditions, and all designs must respect the 18 V ceiling to ensure long-term reliability.

Does CD4503BEE4 support true bidirectional data flow?

No, CD4503BEE4 is a unidirectional noninverting buffer - signals flow only from A-inputs to Y-outputs. It does not contain internal direction-control circuitry or bus transceivers. For bidirectional applications, external control logic or dedicated transceiver ICs (e.g., CD4060-based or 74LVC245) are required. The CD4503BEE4's dual OE structure supports selective output disabling but not reverse signal path activation.

Can CD4503BEE4 be used with 3.3 V logic inputs?

Yes, CD4503BEE4 accepts 3.3 V logic inputs when operated from a ≥5 V supply: its input threshold is V_IL ≤ 0.33×V_DD and V_IH ≥ 0.67×V_DD, so at V_DD = 5 V, V_IH = 3.35 V - safely above 3.3 V logic-high levels. However, at V_DD = 3.3 V, V_IH drops to ~2.2 V, risking marginal recognition. For guaranteed 3.3 V compatibility, operate CD4503BEE4 at V_DD ≥ 5 V.

What is the function of pins 1 and 2 on CD4503BEE4?

Pins 1 and 2 are both labeled OE1 and serve as the active-low output-enable input for buffers Y1 through Y4. They are internally connected and must be driven together - tying them simplifies PCB routing and ensures synchronized control. OE1 has no effect on Y5 or Y6, which are governed solely by OE2 (pin 15). This dual-enable architecture is a defining feature of the CD4503BEE4.

Is CD4503BEE4 pin-compatible with CD4503BE?

Yes, CD4503BEE4 and CD4503BE share identical PDIP-16 packaging, pinout, electrical specifications, and marking (both display "CD4503BE" on the device body). The "E4" suffix denotes tape-and-reel packaging per TI's ordering convention, while "E" indicates tube packaging - both use the same silicon die and mechanical form factor. Engineers may substitute CD4503BEE4 for CD4503BE without layout changes.