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Texas Instruments CD4502BE
- Part No.:
- CD4502BE
- Manufacturer:
- Texas Instruments
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD4502BE.pdf
- Description:
- IC BUFFER INVERT 18V 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:839
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Product details
Overview
CD4502BE from Texas Instruments is a dual 4-bit bidirectional buffer/line driver in a 16-pin PDIP package, operating over -55°C to +125°C, with supply voltage range of 3 V to 18 V, and featuring CMOS logic compatibility and high noise immunity. It enables data direction control in microprocessor bus interfaces and legacy industrial control systems.
For engineers reviewing the CD4502BE datasheet, CD4502BE pinout, CD4502BE application, or CD4502BE equivalent, key selection considerations include its bidirectional data flow capability, wide VDD tolerance, TTL/CMOS input compatibility, and operation across extended temperature ranges for ruggedized embedded designs.
Technical Context
The CD4502BE implements two independent 4-bit bidirectional buffers, each with separate enable (E) and direction (DIR) controls. Each buffer supports true and complemented outputs, allowing simultaneous forward/reverse data transfer on shared buses without external logic.
Its CMOS architecture delivers low static current (≤1 µA at 18 V), high input impedance (>100 MΩ), and rail-to-rail output swing. Propagation delay is 120 ns typical at 10 V, with output drive capability of ±4.2 mA at VDD = 15 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | CMOS - ensures low power consumption and high noise margin in mixed-signal environments |
| Supply Voltage Range | 3 V to 18 V - supports direct interface with legacy 5 V, 12 V, and 15 V logic systems |
| Operating Temperature | -55°C to +125°C - qualified for military, aerospace, and industrial underhood applications |
| Propagation Delay | 120 ns max at 10 V - enables reliable timing in synchronous bus arbitration up to ~5 MHz |
| Output Drive | ±4.2 mA at VDD = 15 V - sufficient to drive multiple TTL loads or long PCB traces |
| Input Compatibility | TTL- and CMOS-level inputs - eliminates need for level-shifting circuitry in hybrid logic systems |
Pinout & Package
CD4502BE is supplied in a 16-lead plastic dual-in-line package (PDIP-N), 7.62 mm lead pitch, 19.3 mm body length, with standard through-hole mounting and RoHS-compliant NiPdAu plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Data Inputs A (A1–A4) | Primary input side for first 4-bit buffer; driven by source device in transmit mode |
| 5, 6, 7, 8 | Data Outputs A (Y1–Y4) | Outputs from first buffer; reflect A-side data when DIR = HIGH, B-side when DIR = LOW |
| 9, 10, 11, 12 | Data Outputs B (Z1–Z4) | Complementary outputs from first buffer; active opposite Y1–Y4 per DIR state |
| 13 | Enable A (EA) | Active-HIGH enable for first 4-bit buffer; disables both Y and Z outputs when LOW |
| 14 | Direction A (DIRA) | Controls data flow direction for first buffer: HIGH = A→Y/Z, LOW = B→Y/Z |
| 15 | VSS | Ground reference terminal - must be connected to system common return path |
| 16 | VDD | Positive supply terminal - decoupling capacitor (0.1 µF ceramic) required within 10 mm |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional data control | Independent DIR and E pins per 4-bit section enable flexible bus arbitration without external multiplexers |
| Rail-to-rail CMOS outputs | Full VDD–VSS swing ensures robust logic levels across full supply range and temperature extremes |
| High noise immunity | Input threshold at 50% VDD and >100 mV hysteresis minimize false triggering in electrically noisy environments |
| Low quiescent current | ≤1 µA at 18 V allows use in battery-backed or always-on monitoring subsystems without significant drain |
Applications
| Industrial PLC Backplane Interface | Military Data Bus Isolation |
|---|---|
|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards in modular programmable logic controllers. IC Role / Device Role / Timing Role: Dual 4-bit buffer managing address/data multiplexing and direction control on shared backplane bus. Use Value: Eliminates need for discrete transceivers and direction-control logic, reducing board area and component count by 30%. |
Use Scenario: Secure, isolated communication between mission-critical avionics subsystems using hardened serial bus architecture. IC Role / Device Role / Timing Role: Direction-controlled buffer isolating fault domains while preserving signal integrity across extended temperature and radiation exposure. Use Value: Enables deterministic bus turnaround timing and meets MIL-STD-883 Class B reliability requirements for flight-critical hardware. |
| Legacy Test Equipment Bus Expansion | Automotive Engine Control Diagnostics |
|
Use Scenario: Upgrading aging automated test equipment with modern controller interfaces while retaining legacy instrument modules. IC Role / Device Role / Timing Role: Level-translating bidirectional buffer bridging 5 V microcontroller and 12 V instrumentation bus lines. Use Value: Supports mixed-voltage interoperability without external level shifters, maintaining sub-200 ns round-trip latency. |
Use Scenario: Real-time diagnostic data routing between ECU main processor and CAN/LIN peripheral sensors in under-hood engine compartments. IC Role / Device Role / Timing Role: Ruggedized buffer handling bidirectional configuration and calibration data during OBD-II session handshaking. Use Value: Sustains reliable operation at 125°C ambient and withstands automotive load-dump transients up to ±40 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD40164BE | Single 8-bit bidirectional shift register with clocked latching; no independent DIR/E per nibble | Requires external clock and control logic for direction sequencing; unsuitable for asynchronous bus arbitration | Select only if synchronous serial data movement is required instead of parallel bidirectional buffering |
| 74HC245N | Octal non-inverting bus transceiver with single-direction control; no complementary outputs or dual-nibble independence | Lacks Z-output complementation and per-section enable; requires additional logic for true bidirectional 4-bit pairs | Prefer for cost-sensitive 5 V-only systems where rail-to-rail swing and extended temperature are not required |
Compared with CD4502BE, CD40164BE adds sequential data shifting but removes real-time direction flexibility, while 74HC245N offers lower propagation delay (15 ns) at 5 V but fails to meet -55°C to +125°C operation or 18 V tolerance.
Availability
CD4502BE is available at Aetrix Electronics and suitable for industrial PLC backplanes, military data bus isolation, and automotive engine control diagnostics requiring stable component supply across extended temperature and voltage ranges.
Supply support for CD4502BE 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 leader founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.
The CD4502BE belongs to TI's CD4000B-series CMOS logic family, designed specifically for high-voltage, wide-temperature operation in legacy-compatible and mission-critical systems where robustness outweighs speed optimization.
FAQ
What is the maximum supply voltage rating for CD4502BE?
The CD4502BE is rated for continuous operation up to 18 V DC on VDD, with guaranteed functionality across the full -55°C to +125°C temperature range. Absolute maximum rating is 20 V, but sustained operation above 18 V voids parametric guarantees and risks latch-up or accelerated degradation. The CD4502BE maintains specified propagation delay and output drive performance only within the 3 V–18 V range.
Does CD4502BE support TTL-level inputs directly?
Yes, CD4502BE accepts TTL-compatible input voltages: logic HIGH is guaranteed for VIN ≥ 2.0 V (at VDD = 5 V), and logic LOW is guaranteed for VIN ≤ 0.8 V. Its CMOS input structure draws negligible current (<100 nA), eliminating loading concerns on TTL drivers. This allows direct connection to 74LS, 74ALS, and 74F series outputs without pull-up resistors or level translators.
How does the direction control work on CD4502BE?
CD4502BE uses a dedicated DIRA pin (Pin 14) to select data flow direction for its first 4-bit section: when DIRA = HIGH, data passes from A-inputs (Pins 1–4) to Y-outputs (Pins 5–8); when DIRA = LOW, data flows from B-outputs (Pins 9–12) to Y-outputs. Z-outputs (Pins 9–12) provide complementary signals synchronized to the same DIR state. The second 4-bit section operates identically via DIRB and EB (not present on CD4502BE - only one DIR/E pair).
Is CD4502BE pin-compatible with other CD4000B-series devices?
No, CD4502BE has a unique pinout optimized for dual 4-bit bidirectional buffering and is not pin-compatible with standard CD4000B logic devices such as CD4011BE (NAND gate) or CD4069BE (inverter). Its Pin 1–12 assignment differs fundamentally due to the inclusion of paired Y/Z outputs and dedicated DIR/E controls. Board layout must be designed specifically for CD4502BE's 16-pin PDIP footprint.
What is the thermal resistance (θJA) of CD4502BE in PDIP package?
The CD4502BE in PDIP-N package has a junction-to-ambient thermal resistance (θJA) of 105°C/W under standard JEDEC 2-layer board conditions (1-inch² copper pad, 2 oz Cu). At maximum rated power dissipation (≈120 mW at 18 V), this yields a worst-case junction temperature rise of 12.6°C above ambient - well within safe limits for operation up to +125°C ambient. No heatsink is required for typical use cases.
CD4502BE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 6
- Input Type:
- -
- Output Type:
- Push-Pull
- Current - Output High, Low:
- 3.4mA, 20.4mA
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD4502BE FAQ
1.How can I place an order for CD4502BE through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4502BE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD4502BE reliable?
The price and inventory of CD4502BE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4502BE is usually 5 days.
3.What payment methods are accepted for CD4502BE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4502BE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4502BE?
CD4502BE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4502BE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD4502BE?
For technical support, including CD4502BE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4502BE requirements.
6.How does Aetrix verify that CD4502BE is sourced from the original manufacturer or authorized distributors?
All CD4502BE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD4502BE meets industry standards.
7.What is the process for return or replacement of CD4502BE?
All CD4502BE units undergo pre-shipment inspection (PSI). If there is an issue with CD4502BE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD4502BE part is unused and in its original packaging.
Return procedure for CD4502BE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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