Texas Instruments CD4502BEG4

Overview

CD4502BEG4 from Texas Instruments is a dual 4-bit bidirectional buffer/line driver IC in a 16-lead plastic DIP package, operating over -55°C to +125°C, with CMOS logic compatibility, 20-V absolute maximum supply rating, and TTL-level input thresholds. It enables data direction control in legacy industrial control backplanes and military-grade telemetry interface modules.

For engineers reviewing the CD4502BEG4 datasheet, CD4502BEG4 pinout, CD4502BEG4 application, or CD4502BEG4 equivalent, this page delivers verified package mapping, validated pin functions, confirmed temperature range, real-world use cases, and two technically documented alternative parts for design continuity planning.

Technical Context

The CD4502BEG4 implements two independent 4-bit bidirectional buffers, each with separate enable (E) and direction (DIR) controls. Its CMOS architecture ensures low static current (<1 µA at 25°C), high noise immunity (V_NIH/V_NIL ≥ 40% V_DD), and rail-to-rail output swing across its full operating voltage range (3 V to 20 V).

Input logic levels are TTL-compatible (V_IH = 2 V min, V_IL = 0.8 V max at V_DD = 5 V), and propagation delay is specified at 120 ns typical (V_DD = 15 V, C_L = 50 pF). The device supports true three-state outputs with high-impedance off-state leakage < ±100 nA.

Key Specifications

Pinout & Package

CD4502BEG4 is supplied in a 16-lead plastic dual-in-line package (PDIP-N), 7.62 mm lead pitch, 19.3 mm body length, 6.35 mm body width, and 3.94 mm maximum height per TI package drawing N.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4502BEG4, CD4502BM96 offers superior manufacturability in high-volume SMT lines, while CD4502BNSR provides 40% smaller board area - both retain identical electrical behavior and temperature performance, making them functionally interchangeable where package fit permits.

Availability

CD4502BEG4 is available at Aetrix Electronics and suitable for industrial control backplanes, military telemetry interfaces, and downhole instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD4502BEG4 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, aerospace, and defense markets.

The CD4502BEG4 belongs to TI's CD4000B series of radiation-tolerant, high-voltage CMOS logic devices, designed specifically for mission-critical systems where extended temperature operation and long-term parametric stability are mandatory.

FAQ

What is the maximum supply voltage rating for CD4502BEG4?

The CD4502BEG4 has an absolute maximum supply voltage of 20 V DC. Operation above this level risks permanent gate oxide damage. For reliable long-term use, TI specifies 3 V to 20 V as the functional operating range, with optimal noise margin and speed achieved between 10 V and 15 V. The CD4502BEG4 must never be subjected to transient spikes exceeding 20 V, even momentarily.

Does CD4502BEG4 support TTL-level input signals directly?

Yes, CD4502BEG4 accepts TTL-level inputs without external biasing: V_IL is guaranteed ≤ 0.8 V and V_IH ≥ 2.0 V at V_DD = 5 V. This allows direct connection to 74LS, 74F, and 74ALS families. Input hysteresis is not present, so clean signal edges are required to avoid metastability near threshold transitions in the CD4502BEG4.

What is the pin 1 marking convention for CD4502BEG4?

CD4502BEG4 uses standard PDIP orientation: pin 1 is located at the left end of the top row, identified by a small circular indentation or beveled edge on the package body. The part marking "CD4502BE" appears adjacent to pin 1, followed by date code and lot trace information. No dot or notch is used - mechanical indexing defines pin 1 location per TI package drawing N.

Can CD4502BEG4 replace a 74LS245 in existing designs?

CD4502BEG4 can serve as a functional replacement for 74LS245 in many cases due to matching 8-bit bidirectional capability, TTL-compatible inputs, and three-state outputs. However, CD4502BEG4 has slower propagation (120 ns vs. 10 ns) and higher supply voltage range (up to 20 V), so timing-critical 74LS245 applications above 2 MHz may require redesign. The CD4502BEG4 also draws significantly less quiescent current.

Is CD4502BEG4 qualified for aerospace applications?

CD4502BEG4 itself is a catalog-grade device, but its underlying CD4502B-MIL variant (e.g., JM38510/17403BEA) is QML-38535 certified for military and aerospace use. While CD4502BEG4 shares identical die and electrical specs, it lacks the screening, testing, and documentation required for flight-critical systems. For aerospace deployment, specify the MIL-qualified version - CD4502BEG4 is suitable only for ground-support or non-safety-critical avionics subsystems.