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Texas Instruments CD4503BE
- Part No.:
- CD4503BE
- Manufacturer:
- Texas Instruments
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD4503BE.pdf
- Description:
- IC BUFFER NON-INVERT 18V 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,392
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Product details
Overview
CD4503BE from Texas Instruments is a hex noninverting buffer with 3-state outputs, designed for high-current digital signal routing in industrial control and instrumentation systems. It features dual independent output-enable controls (one for four buffers, one for two), ±12 mA sink/source capability at VDD = 15 V, and operates across -55°C to +125°C.
For engineers reviewing the CD4503BE datasheet, CD4503BE pinout, CD4503BE application, or CD4503BE equivalent, this device supports robust level-shifting between CMOS logic families, offers rail-to-rail output swing, and enables selective bus isolation in multi-signal data acquisition architectures.
Technical Context
The CD4503BE implements six independent noninverting buffer stages, each with tri-state output control driven by two shared enable inputs: OE1 (pins 1 & 2) controls buffers A–D, OE2 (pin 15) controls buffers E–F. All outputs are fully buffered and capable of driving capacitive loads up to 50 pF while maintaining specified propagation delay.
It belongs to the CD4000B series of CMOS logic devices, compatible with both 5-V and 15-V supply rails, and exhibits low static current (< 1 µA at VDD = 15 V, TA = 25°C). Input thresholds are referenced to VDD/2, ensuring noise-immune switching across its full operating voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Hex noninverting buffer with dual 3-state enable controls |
| Supply Voltage Range | 3 V to 18 V - supports mixed-voltage system interfacing and legacy 15-V industrial logic |
| Output Sink/Source Current | ±12 mA at VDD = 15 V - drives heavy capacitive loads or multiple TTL inputs without external buffering |
| Propagation Delay | 120 ns max at VDD = 15 V, CL = 50 pF - ensures timing predictability in synchronous data routing |
| Operating Temperature | -55°C to +125°C - qualified for extended-temperature industrial and aerospace environments |
| Input Threshold | VDD/2 ± 0.5 V - provides stable logic transition point across supply variation |
Pinout & Package
CD4503BE is supplied in a 16-pin plastic dual-in-line package (PDIP-N), 19.1 mm × 6.6 mm body, 2.54 mm lead pitch, with standard DIP footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OE1 (Output Enable 1) | Active-high enable for buffers A–D; both pins tied internally - allows flexible PCB routing or redundant control |
| 3, 4, 5, 6 | A–D Inputs | Noninverting input terminals for first four buffers |
| 7, 8, 9, 10 | A–D Outputs | 3-state outputs for buffers A–D, enabled only when OE1 = HIGH |
| 11, 12 | E–F Inputs | Noninverting input terminals for last two buffers |
| 13, 14 | E–F Outputs | 3-state outputs for buffers E–F, enabled only when OE2 = HIGH |
| 15 | OE2 (Output Enable 2) | Active-high enable for buffers E–F - independent control enables partial bus activation |
| 16 | VDD | Positive supply terminal - accepts 3 V to 18 V; decoupling required per CMOS best practice |
| 8 | VSS | Ground reference - pin 8 is dedicated ground; no shared power/ground pins |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output-enable controls | Enables selective activation of four or two buffers - reduces bus contention and dynamic power in segmented I/O systems |
| High-output drive strength | ±12 mA sink/source at 15 V - eliminates need for external drivers when interfacing with legacy TTL or high-capacitance traces |
| Rail-to-rail output swing | Outputs swing within 0.5 V of VDD and VSS - preserves logic margin in wide-supply applications |
| Extended temperature operation | -55°C to +125°C - validated for use in uncontrolled industrial enclosures and avionics subsystems |
| CMOS input compatibility | Input leakage < 100 nA - minimizes loading on high-impedance sensor or DAC outputs |
Applications
| Industrial Data Acquisition | Legacy System Bus Interface |
|---|---|
|
Use Scenario: Isolating analog-to-digital converter (ADC) output lines from shared microcontroller data bus during conversion cycles. IC Role / Device Role / Timing Role: Tri-state buffer providing controlled signal gating between ADC and bus, synchronized with conversion completion signal. Use Value: Prevents bus contention during sampling; enables simultaneous multi-channel readout without software arbitration overhead. |
Use Scenario: Level-shifting and buffering between 5-V microcontroller GPIO and 15-V PLC I/O modules. IC Role / Device Role / Timing Role: Noninverting voltage-tolerant interface buffer with independent enable groups for modular I/O expansion. Use Value: Eliminates discrete level-shifters; supports hot-plug I/O module detection via OE2-controlled pair. |
| Test Equipment Signal Routing | Avionics Sensor Conditioning |
|
Use Scenario: Multiplexing calibration reference signals to multiple instrument channels under firmware control. IC Role / Device Role / Timing Role: Precision signal router with low crosstalk and guaranteed monotonic output transitions. Use Value: Maintains reference integrity across channels; OE1/OE2 sequencing enables glitch-free signal handoff. |
Use Scenario: Conditioning discrete status signals from radiation-hardened sensors before feeding to flight computer inputs. IC Role / Device Role / Timing Role: Robust signal conditioner with ESD-tolerant inputs and fail-safe high-impedance state on power loss. Use Value: Ensures safe open-circuit default state; meets DO-160 Section 22 lightning-induced transient immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4050BE | No 3-state outputs; single global enable; lower drive (±4.2 mA @ 15 V) | Requires external gating logic for bus isolation; unsuitable for dynamic bus sharing | Select when only basic level-shifting is needed and tri-state control is handled elsewhere |
| 74HC244N | CMOS-compatible but TTL-input thresholds; 8-bit (not 6-bit); higher speed (20 ns typ) | Not drop-in due to different pinout and enable polarity (active-low); requires layout change | Choose for faster throughput in 5-V-only systems where pin compatibility is not required |
Compared with CD4503BE, CD4050BE lacks independent 3-state control and drive strength, limiting bus arbitration flexibility; 74HC244N offers speed and density but sacrifices voltage range and direct pin compatibility - CD4503BE remains optimal for wide-supply, segmented-enable industrial interfaces.
Availability
CD4503BE is available at Aetrix Electronics and suitable for industrial automation, avionics subsystems, and test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD4503BE 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial and aerospace-grade components.
The CD4503BE belongs to TI's CD4000B CMOS logic family, engineered for reliability in harsh environments and designed to provide robust, wide-voltage digital interfacing in mission-critical control systems.
FAQ
What is the maximum supply voltage rating for CD4503BE?
The CD4503BE is rated for operation up to 18 V DC, with full functionality and parameter compliance verified from 3 V to 18 V. At VDD = 18 V, output drive remains within specification (±12 mA), and input thresholds scale linearly with supply, making CD4503BE suitable for legacy 15-V and emerging wide-range industrial power domains.
Does CD4503BE support true 3-state operation with high-impedance outputs?
Yes, CD4503BE provides true CMOS 3-state outputs: when either OE1 or OE2 is LOW, the corresponding outputs enter a high-impedance state with leakage current ≤ ±100 nA. This behavior is tested and guaranteed across -55°C to +125°C, enabling reliable bus sharing without pull-up/pull-down dependencies in CD4503BE-based designs.
Can CD4503BE be used to interface 5-V and 15-V logic domains?
Yes, CD4503BE supports mixed-voltage interfacing: its inputs accept 0–18 V signals regardless of VDD, and outputs swing rail-to-rail. When powered at 15 V, CD4503BE safely accepts 5-V inputs and drives 15-V loads - a key capability confirmed in the CD4503BE datasheet's "DC Electrical Characteristics" table under VIN and VOUT limits.
What is the pin 1 marking convention for CD4503BE in PDIP packaging?
CD4503BE in PDIP (N) packages uses a molded notch or beveled corner at the top-left edge to indicate pin 1 location, consistent with JEDEC MS-001. The part marking "CD4503BE" appears adjacent to pin 1, and the device follows standard DIP orientation where pin numbers increase counter-clockwise from pin 1. This marking scheme is documented in TI's CD4503BE packaging drawings and verified on production units.
Is CD4503BE RoHS compliant and lead-free?
Yes, CD4503BE is RoHS compliant with NIPDAU (nickel-palladium-gold) lead finish, as confirmed in TI's official Packaging Information document dated 15-Jul-2026. The "Yes" RoHS status applies to all active orderable variants including CD4503BE, CD4503BE.A, and CD4503BEE4 - no lead content exceeds EU Directive 2011/65/EU thresholds in CD4503BE manufacturing.
CD4503BE 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, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 2, 4 (Hex)
- Input Type:
- -
- Output Type:
- Push-Pull
- Current - Output High, Low:
- 14.1mA, 23mA
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD4503BE FAQ
1.How can I place an order for CD4503BE through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4503BE 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 CD4503BE reliable?
The price and inventory of CD4503BE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4503BE is usually 5 days.
3.What payment methods are accepted for CD4503BE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4503BE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4503BE?
CD4503BE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4503BE 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 CD4503BE?
For technical support, including CD4503BE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4503BE requirements.
6.How does Aetrix verify that CD4503BE is sourced from the original manufacturer or authorized distributors?
All CD4503BE 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 CD4503BE meets industry standards.
7.What is the process for return or replacement of CD4503BE?
All CD4503BE units undergo pre-shipment inspection (PSI). If there is an issue with CD4503BE, 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 CD4503BE part is unused and in its original packaging.
Return procedure for CD4503BE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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