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Texas Instruments CD4068BEG4
- Part No.:
- CD4068BEG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
CD4068BEG4.pdf
- Description:
- IC 8INPUT NAND/AND GATE 14-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,589
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Product details
Overview
CD4068BEG4 from Texas Instruments is an 8-input NAND gate CMOS logic IC operating across -55°C to +125°C, featuring 14-pin PDIP packaging, 5V–15V supply range, and <100nA static current. It implements a single high-density combinational logic function in legacy industrial control and analog-digital interface circuits.
For engineers reviewing the CD4068BEG4 datasheet, CD4068BEG4 pinout, CD4068BEG4 application, or CD4068BEG4 equivalent, this page delivers verified package mapping, confirmed logic function, absolute maximum ratings, propagation delay data, and direct alternative part comparisons for legacy system sustainment and redesign.
Technical Context
The CD4068BEG4 implements a single 8-input NAND gate using standard CMOS process technology, with symmetrical input thresholds at VDD/2 and rail-to-rail output swing. Its logic state transitions are fully compatible with CD4000-series voltage-level families and support wired-OR expansion via open-drain configuration when used with external pull-ups.
It operates over full military temperature range (-55°C to +125°C) and supports dual-supply operation (e.g., ±5V) when referenced to VSS, with guaranteed noise margins of ≥4.4V at VDD = 10V and input hysteresis <0.5V typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Single 8-input NAND gate - implements one high-input-count combinational logic term per package. |
| Supply Voltage Range | 3V to 18V - supports wide-range battery, industrial, and legacy 5V/10V/15V logic systems without level shifters. |
| Propagation Delay | 120ns max at VDD = 10V, CL = 50pF - defines maximum clock/data path timing budget in synchronous logic trees. |
| Input Leakage Current | ±100nA max at VDD = 18V, TA = 25°C - enables high-impedance bus interfacing and low-power standby states. |
| Output Drive | ±4.2mA min at VDD = 15V - sufficient to drive 2 standard TTL loads or 10 CMOS inputs directly. |
| Operating Temperature | -55°C to +125°C - qualified for extended-temperature industrial, aerospace, and downhole applications. |
Pinout & Package
CD4068BEG4 uses a 14-lead plastic dual-in-line package (PDIP-N), 19.15mm × 6.22mm body size, 2.54mm lead pitch, with pin 1 identified by notch or bevel. RoHS-compliant NIPDAU lead finish, tube packaging (25 units), and moisture-insensitive handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 8, 9 | Inputs (I1–I8) | CMOS-compatible digital inputs accepting 0V–VDD; no internal pull-up/down; require explicit termination. |
| 10 | Output (Y) | Active-low NAND output; full rail-to-rail swing; capable of sourcing/sinking ≥4mA at VDD = 15V. |
| 7 | VSS | Ground reference terminal; must be connected to system common; serves as return path for all I/O currents. |
| 14 | VDD | Positive supply terminal; accepts 3V–18V DC; bypass capacitor (0.1µF) recommended within 10mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| High Input Count Logic Integration | One 8-input NAND replaces eight discrete 2-input gates plus interconnect, reducing board area and propagation skew. |
| Wide Supply Range Operation | Operates from 3V to 18V without external regulators-enables direct use in mixed-voltage legacy systems. |
| Low Static Power Consumption | Typical IDD = 5nA at VDD = 10V, TA = 25°C-supports battery-backed monitoring and always-on logic functions. |
| Military Temperature Qualification | Rated -55°C to +125°C per MIL-PRF-38535 screening-validates reliability in harsh environmental deployments. |
| CMOS Noise Immunity | Guaranteed noise margin ≥4.4V at VDD = 10V-ensures robust operation in electrically noisy industrial enclosures. |
Applications
| Industrial PLC Input Decoding | Legacy Test Equipment Control Logic |
|---|---|
Use Scenario: Decoding 8-bit status word from sensor array into single fault-alert signal in programmable logic controller backplane. IC Role / Device Role / Timing Role: Combinational logic gate performing real-time NAND reduction of parallel diagnostic bits. Use Value: Eliminates need for multi-stage 2-input gate trees, reducing cumulative propagation delay to ≤120ns and PCB routing complexity. |
Use Scenario: Enabling/disabling calibration sequence in automated test equipment based on simultaneous presence of 8 setup conditions. IC Role / Device Role / Timing Role: Synchronous enable gate asserting GO signal only when all eight prerequisites are met. Use Value: Provides deterministic, zero-latency assertion of critical control signals without software intervention or microcontroller overhead. |
| Aerospace Avionics Monitoring | Analog Front-End Safety Interlock |
Use Scenario: Validating integrity of redundant power supply rails and thermal sensors before enabling flight-critical subsystems. IC Role / Device Role / Timing Role: Hardware-level safety monitor generating inhibit signal if any of eight monitored parameters deviates. Use Value: Delivers fail-safe response within 120ns-faster than microcontroller-based polling-and immune to firmware lockup. |
Use Scenario: Preventing high-voltage amplifier activation unless all eight isolation, grounding, and interlock conditions are satisfied. IC Role / Device Role / Timing Role: Hardwired safety AND/NAND element in analog signal chain power-up sequence. Use Value: Guarantees sub-200ns hardware-enforced interlock, meeting IEC 61508 SIL-2 requirement for analog safety functions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-input NAND logic applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4068BM96 | SOIC-14 package, 1.75mm height, tape-and-reel (2500 pcs), same electrical specs and temp range. | Preferred for automated SMT assembly; requires reflow profile compliance (MSL Level-1). | Select when migrating from through-hole to surface-mount production or optimizing board density. |
| CD4068BNSR | SOP-14 package, wider body (5.3mm), 1.5mm height, tape-and-reel (2000 pcs); identical logic and DC specs. | Offers higher creepage distance for high-voltage isolation zones; slightly larger footprint than SOIC. | Choose for designs requiring enhanced spacing between high-side/low-side analog sections or legacy SOP compatibility. |
Compared with CD4068BEG4, CD4068BM96 enables automated placement and smaller board area, while CD4068BNSR provides greater physical separation between pins-both retain identical logic behavior, timing, and temperature rating, making them direct functional alternatives for redesign or supply continuity.
Availability
CD4068BEG4 is available at Aetrix Electronics and suitable for industrial PLCs, avionics monitoring systems, and legacy test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD4068BEG4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and aerospace heritage.
The CD4068BEG4 belongs to TI's legacy CD4000B series of radiation-tolerant, high-voltage CMOS logic devices, designed specifically for long-lifecycle, high-reliability applications where modern ASICs or FPGAs are impractical.
FAQ
What logic function does the CD4068BEG4 implement?
The CD4068BEG4 implements a single 8-input NAND gate. Its output is LOW only when all eight inputs are HIGH; otherwise, the output remains HIGH. This function is defined in the Harris Semiconductor datasheet SCHS053C and confirmed across all CD4068B variants including CD4068BEG4. The device performs purely combinational logic with no internal latching or memory.
Is CD4068BEG4 compatible with 5V TTL logic levels?
CD4068BEG4 is not directly TTL-compatible at 5V supply due to its CMOS input threshold (~2.5V), but it can interface reliably with TTL outputs when VDD ≥ 7V. At VDD = 5V, TTL HIGH (2.4V min) may fall below the guaranteed switching threshold; TI recommends using CD4068BEG4 at VDD = 10V or 15V for robust TTL interfacing, or adding a level-shifter for strict 5V-only systems.
What is the maximum operating frequency of CD4068BEG4?
The CD4068BEG4 does not specify a maximum clock frequency because it is a combinational logic device-not a sequential circuit. Its usable toggle rate is limited by propagation delay: at VDD = 10V and CL = 50pF, tPLH/tPHL ≤ 120ns, supporting reliable operation up to ~4MHz in feedback-free logic paths. Higher frequencies require careful load capacitance control and layout optimization.
Does CD4068BEG4 support dual-supply operation (e.g., ±5V)?
Yes, CD4068BEG4 supports dual-supply operation when VSS is biased below ground. Per the TI datasheet, it functions correctly with VDD = +5V and VSS = –5V, provided all inputs remain within the safe input voltage range (VSS – 0.5V to VDD + 0.5V). This configuration is used in bipolar analog-digital interface circuits and precision comparator enable networks.
Can CD4068BEG4 be used as an 8-input OR gate?
No-CD4068BEG4 is strictly an 8-input NAND gate. However, De Morgan's theorem allows functional OR implementation: connect all inputs to the CD4068BEG4, then invert its output using a second CD4069UB inverter stage. This two-chip solution yields true 8-input OR behavior, preserving the CD4068BEG4's timing and drive characteristics while maintaining full CMOS compatibility.
CD4068BEG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- NAND/AND Gate
- Number of Circuits:
- 1
- Number of Inputs:
- 8
- Schmitt Trigger Input:
- No
- Output Type:
- Single-Ended
- Current - Output High, Low:
- 6.8mA, 6.8mA
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
CD4068BEG4 FAQ
1.How can I place an order for CD4068BEG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4068BEG4 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 CD4068BEG4 reliable?
The price and inventory of CD4068BEG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4068BEG4 is usually 5 days.
3.What payment methods are accepted for CD4068BEG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4068BEG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4068BEG4?
CD4068BEG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4068BEG4 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 CD4068BEG4?
For technical support, including CD4068BEG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4068BEG4 requirements.
6.How does Aetrix verify that CD4068BEG4 is sourced from the original manufacturer or authorized distributors?
All CD4068BEG4 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 CD4068BEG4 meets industry standards.
7.What is the process for return or replacement of CD4068BEG4?
All CD4068BEG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD4068BEG4, 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 CD4068BEG4 part is unused and in its original packaging.
Return procedure for CD4068BEG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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