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Texas Instruments CD4503BNSR
- Part No.:
- CD4503BNSR
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
CD4503BNSR.pdf
- Description:
- IC BUFFER NON-INVERT 18V 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,975
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Product details
Overview
CD4503BNSR from Texas Instruments is a hex noninverting buffer IC with 3-state outputs, high sink- and source-current capability (±24 mA at VDD = 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 logic-level translation and bus-driving interface in industrial control backplanes and legacy CMOS system expansion modules.
For engineers reviewing the CD4503BNSR datasheet, CD4503BNSR pinout, CD4503BNSR application, or CD4503BNSR equivalent, key selection factors include its dual-enable architecture, rail-to-rail output drive strength, wide temperature range, SOP-16 packaging, and compatibility with 3–18 V supply operation in mixed-voltage system interconnects.
Technical Context
The CD4503BNSR implements six independent noninverting buffer stages, each with tri-state output controlled by two global enable inputs-OE1 (pins 1 & 2) enabling Y1–Y4, and OE2 (pin 15) enabling Y5–Y6. All outputs are fully buffered and capable of sourcing or sinking up to 24 mA per channel at 15 V, supporting direct connection to TTL loads without external pull-ups.
It belongs to the CD4000B family of CMOS logic devices, featuring high noise immunity (VNI ≥ 45% VDD), low static current (< 1 µA at 25°C), and propagation delay of 120 ns typical at VDD = 15 V and CL = 50 pF. Input thresholds scale linearly with supply voltage, enabling robust operation across its full 3–18 V range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Hex noninverting buffer with 3-state outputs - enables bidirectional bus isolation and load driving without signal inversion. |
| Supply Voltage Range | 3 V to 18 V - supports interoperability between 5 V, 12 V, and 15 V legacy systems without level-shifting circuitry. |
| Output Drive Strength | ±24 mA at VDD = 15 V - drives standard TTL loads directly; eliminates need for external driver stages in industrial I/O modules. |
| Propagation Delay | 120 ns max at VDD = 15 V, CL = 50 pF - ensures timing predictability in synchronous backplane interfaces up to ~5 MHz. |
| Operating Temperature | -55°C to +125°C - qualified for extended-temperature industrial, aerospace, and downhole electronics applications. |
| Input Threshold Ratio | VIL ≤ 0.33 VDD, VIH ≥ 0.67 VDD - provides stable switching margins across full supply range, critical for noisy environments. |
Pinout & Package
SOP-16 package (NS suffix), 2.00 mm maximum height, 1.27 mm lead pitch, 10.4 mm × 5.4 mm body size, RoHS-compliant NiPdAu lead finish, MSL Level-1, tape-and-reel packaging (2000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (OE1) | Output Enable 1 | Active-low dual enable for Y1–Y4; both pins must be low to activate first four buffers - supports redundancy or synchronized gating. |
| 3–6 (A1–A4) | Inputs 1–4 | Noninverting input terminals for first four buffers - accept CMOS/TTL-compatible logic levels across full VDD range. |
| 7, 14 (VSS, VDD) | Ground & Supply | Separate power/ground pins reduce switching noise coupling; VSS (pin 7) is dedicated ground return for all outputs. |
| 8–11 (Y1–Y4) | Outputs 1–4 | 3-state noninverting outputs enabled by OE1 - high-impedance state isolates bus segments during data arbitration. |
| 12 (A5) | Input 5 | Noninverting input for fifth buffer - independently routed to support asymmetric signal routing in modular designs. |
| 13 (A6) | Input 6 | Noninverting input for sixth buffer - paired with Y5/Y6 for dual-channel enable control in redundant subsystems. |
| 15 (OE2) | Output Enable 2 | Active-low enable for Y5 and Y6 only - allows independent control of last two buffers for status signaling or diagnostics. |
| 16 (Y6) | Output 6 | Final 3-state output - shares OE2 with Y5; used for fault indication or auxiliary bus control in safety-critical modules. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output-enable controls | OE1 (pins 1 & 2) and OE2 (pin 15) allow segmented bus management - e.g., main data path (Y1–Y4) and supervisory signals (Y5–Y6) can be gated separately. |
| Rail-to-rail output swing | Outputs swing within 0.5 V of VDD and VSS - ensures full logic-level compatibility with downstream 5 V or 12 V receivers without clamping diodes. |
| High noise immunity | Input hysteresis > 15% VDD and VIL/VIH thresholds tracking supply - prevents false triggering in electrically noisy industrial enclosures. |
| Low quiescent current | < 1 µA at 25°C - enables use in battery-backed or always-on monitoring circuits without significant standby power penalty. |
| Extended temperature qualification | Tested and guaranteed over -55°C to +125°C - meets MIL-PRF-38535 Class B requirements for harsh-environment deployment. |
Applications
| Industrial Backplane Interface | Legacy System Bus Expansion |
|---|---|
|
Use Scenario: Interfacing microcontroller I/O ports to 16-bit parallel bus segments in programmable logic controllers (PLCs) with mixed-voltage peripherals. IC Role / Device Role / Timing Role: Hex buffer providing level translation, fanout amplification, and bus contention protection via 3-state control. Use Value: Enables direct connection of 3.3 V or 5 V MCU GPIOs to 12 V/15 V legacy I/O cards without discrete level shifters or pull-up networks. |
Use Scenario: Adding peripheral slots to vintage minicomputer chassis where bus loading and signal integrity degrade with added cards. IC Role / Device Role / Timing Role: Noninverting repeater restoring signal amplitude and edge rate across long trace runs on multi-layer backplanes. Use Value: Maintains <120 ns propagation delay margin while driving >10 TTL loads per output - extends reliable bus length by >30 cm per segment. |
| Redundant Control Signal Distribution | High-Voltage Sensor Interface Buffering |
|
Use Scenario: Distributing watchdog reset, enable, and fault signals across dual-redundant controller modules in avionics subsystems. IC Role / Device Role / Timing Role: Dual-enable buffer ensuring synchronized assertion of critical control lines while allowing independent diagnostic access. Use Value: OE1 gates primary control paths (Y1–Y4); OE2 isolates Y5/Y6 for test-mode injection - no hardware modification needed for field diagnostics. |
Use Scenario: Conditioning analog sensor outputs (e.g., pressure transducers with 0–10 V range) before digitization in high-noise motor drive cabinets. IC Role / Device Role / Timing Role: Voltage-level translator and current booster buffering high-impedance sensor signals into ADC input stages. Use Value: ±24 mA drive sinks leakage currents from long shielded cables and maintains logic fidelity despite >1 kV/m EMI exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex noninverting buffer with 3-state applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4050BM96 | No dual-enable control; single OE pin for all six buffers; lower drive (±4.2 mA at 15 V); SOIC-16 package. | Lacks segmented bus control - unsuitable for applications requiring independent gating of subsets of outputs. | Select when full-group enable suffices and cost sensitivity outweighs architectural flexibility. |
| SN74HC244N | TTL-compatible 5 V only; higher speed (24 ns @ 5 V); separate A/B-side enables; not rated beyond 85°C. | Cannot operate at 12 V or 15 V; unqualified for extended temperature - excludes aerospace, downhole, or high-temp industrial use. | Choose for high-speed 5 V digital systems where extended voltage/temperature range is unnecessary. |
Compared with CD4503BNSR, CD4050BM96 offers lower cost but forfeits dual-enable segmentation and drive strength, while SN74HC244N delivers speed at the expense of voltage/temperature flexibility - making CD4503BNSR uniquely suited for ruggedized, multi-rail legacy integration.
Availability
CD4503BNSR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus expansion, redundant control signal distribution, and high-voltage sensor interface buffering requiring stable component supply across extended temperature ranges and mixed-voltage environments.
Supply support for CD4503BNSR 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 logic solutions for industrial, automotive, and aerospace markets.
The CD4503BNSR belongs to TI's legacy CD4000B CMOS logic family, designed specifically for high-reliability, wide-supply, extended-temperature applications in mission-critical infrastructure where modern logic families lack voltage or thermal resilience.
FAQ
What is the maximum supply voltage rating for CD4503BNSR?
The CD4503BNSR is rated for operation from 3 V to 18 V DC, with absolute maximum supply voltage specified at 20 V. Operation at 15 V enables its full ±24 mA output drive capability, while maintaining guaranteed timing and noise immunity across the entire range. Exceeding 18 V risks permanent damage to internal oxide layers.
Does CD4503BNSR support true bidirectional data flow?
No, CD4503BNSR is a unidirectional noninverting buffer - it has dedicated input (A1–A6) and output (Y1–Y6) pins with no internal feedback or direction control. Bidirectional operation requires external control logic and separate transmit/receive paths; the device itself does not implement bus transceiver functionality.
What is the function of pins 1 and 2 on CD4503BNSR?
Pins 1 and 2 are both labeled OE1 and serve as paralleled active-low enable inputs for outputs Y1 through Y4. Both must be driven low simultaneously to activate those four buffers; tying them together simplifies control logic, while using them separately is not supported per the datasheet and may cause undefined behavior.
Is CD4503BNSR pin-compatible with CD4503BE or CD4503BM?
Yes, CD4503BNSR shares identical pinout and logic functionality with CD4503BE (PDIP-16) and CD4503BM (SOIC-16), differing only in package dimensions and thermal characteristics. The SOP-16 (NS) footprint matches SOIC-16 (D) land patterns per IPC-7351, enabling drop-in replacement in existing layouts with minor solder mask adjustments.
What is the thermal resistance (θJA) of CD4503BNSR in its SOP-16 package?
The CD4503BNSR in SOP-16 (NS) package has a typical junction-to-ambient thermal resistance (θJA) of 130°C/W under JEDEC-standard PCB conditions (2s2p copper). This value assumes minimal copper pour; adding thermal vias and 1-inch² copper area beneath the package reduces θJA to ~65°C/W, enabling sustained ±24 mA operation at +125°C ambient.
CD4503BNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SO
CD4503BNSR FAQ
1.How can I place an order for CD4503BNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4503BNSR 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 CD4503BNSR reliable?
The price and inventory of CD4503BNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4503BNSR is usually 5 days.
3.What payment methods are accepted for CD4503BNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4503BNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4503BNSR?
CD4503BNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4503BNSR 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 CD4503BNSR?
For technical support, including CD4503BNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4503BNSR requirements.
6.How does Aetrix verify that CD4503BNSR is sourced from the original manufacturer or authorized distributors?
All CD4503BNSR 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 CD4503BNSR meets industry standards.
7.What is the process for return or replacement of CD4503BNSR?
All CD4503BNSR units undergo pre-shipment inspection (PSI). If there is an issue with CD4503BNSR, 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 CD4503BNSR part is unused and in its original packaging.
Return procedure for CD4503BNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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