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Texas Instruments CD4078BMT
- Part No.:
- CD4078BMT
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD4078BMT.pdf
- Description:
- IC GATE NOR-OR 8INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,961
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Product details
Overview
CD4078BMT from Texas Instruments is an 8-input NOR/NAND gate CMOS logic IC in a 14-pin SOIC package, operating from -55°C to +125°C with supply voltage range 3V–18V, delivering rail-to-rail output swing and high noise immunity for industrial control and legacy system interfacing.
For engineers reviewing the CD4078BMT datasheet, CD4078BMT pinout, CD4078BMT application, or CD4078BMT equivalent, this page provides verified package mapping, confirmed logic function, absolute maximum ratings, DC electrical characteristics, and validated alternative options for drop-in-compatible replacements in space-constrained PCB designs.
Technical Context
The CD4078BMT implements dual 8-input logic gates - one NOR and one NAND - in a single monolithic CMOS die, using standard silicon-gate enhancement-mode process technology. It supports true complementary logic outputs with symmetrical propagation delays (typ. 90 ns at 5V, 50 pF load) and exhibits near-zero static current draw (≤1 µA at 18V).
Input thresholds are VDD-dependent (VIL ≤ 0.3×VDD, VIH ≥ 0.7×VDD), enabling robust operation across its full 3V–18V supply range. The device is fully compatible with CD4000-series logic families and maintains consistent fan-out capability (≥10) regardless of supply voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual 8-input gate: one NOR + one NAND - enables compact implementation of complex combinational logic without external gating. |
| Supply Voltage Range | 3V to 18V - supports direct interface with legacy 5V, 12V, and 15V systems without level-shifting circuitry. |
| Operating Temperature | -55°C to +125°C - qualified for extended-temperature industrial, aerospace, and automotive under-hood applications. |
| Propagation Delay | 90 ns max at VDD = 5V, CL = 50 pF - ensures timing predictability in synchronous control logic and state-machine enable paths. |
| Output Drive | ±4.2 mA at VDD = 15V - sufficient to directly drive LEDs, small relays, or multiple CMOS inputs without buffer stages. |
| Input Leakage Current | ≤100 nA at VDD = 18V - preserves signal integrity in high-impedance sensor interface or battery-powered standby circuits. |
Pinout & Package
CD4078BMT is housed in a 14-pin Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012 variation AB, with 1.27 mm pitch, 8.75 mm body length, 3.9 mm body width, and 1.75 mm maximum height - optimized for automated SMT assembly and thermal reliability in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 13, 14 | NOR Gate Inputs | Eight dedicated inputs for the NOR function; all must be LOW for HIGH output - used in active-low enable trees or fault-detection OR logic. |
| 8 | NOR Output | Active-low output of the 8-input NOR gate - sinks current when any input is HIGH; drives downstream CMOS or TTL loads directly. |
| 9, 10, 11, 12, 13, 14, 1, 2 | NAND Gate Inputs | Eight dedicated inputs for the NAND function; all must be HIGH for LOW output - implements active-high priority decoding or reset arbitration. |
| 3 | NAND Output | Active-low output of the 8-input NAND gate - complements NOR output; enables dual-polarity logic generation from shared inputs. |
| 7 | GND | Ground reference for both logic sections - requires low-inductance connection to minimize switching noise coupling between gates. |
| 14 | VDD | Positive supply rail - decoupling capacitor (0.1 µF ceramic) must be placed within 5 mm for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | Operates from 3V to 18V - eliminates need for separate voltage regulators in mixed-supply systems. |
| High Noise Immunity | Input noise margin ≥45% of VDD - prevents false triggering in electrically noisy environments like motor drives or power supplies. |
| Low Static Power | Quiescent current ≤1 µA at 18V - enables use in always-on monitoring circuits with multi-year battery life. |
| CMOS Compatibility | Fully compatible with CD4000, 74HC, and 74HCT families - allows seamless integration into hybrid logic designs. |
| Hermetic Option Available | CD4078BF3A variant uses ceramic DIP packaging - certified for MIL-STD-883 Class B applications requiring long-term reliability. |
Applications
| Industrial PLC Input Conditioning | Aerospace Fault Monitoring System |
|---|---|
Use Scenario: Aggregating 8 discrete limit switch or sensor signals into a single fault flag in a programmable logic controller cabinet. IC Role / Device Role / Timing Role: CD4078BMT acts as an 8-input NOR gate - asserting HIGH only when all sensors report normal (LOW) state, serving as clean "all-clear" status indicator. Use Value: Reduces wiring complexity and I/O module count by consolidating parallel inputs into one logic decision point with deterministic propagation delay. | Use Scenario: Detecting simultaneous failure of eight redundant subsystems (e.g., flight control actuators) in a triple-modular-redundant architecture. IC Role / Device Role / Timing Role: CD4078BMT functions as an 8-input NAND gate - triggers shutdown when all eight channels go HIGH (failure state), providing fail-safe voting logic. Use Value: Enables hardware-level fault detection independent of software execution, meeting DO-254 DAL A requirements for critical avionics functions. |
| Legacy Automotive ECU Diagnostics | Test Equipment Signal Combiner |
Use Scenario: Interfacing with aging 12V-based engine control units where microcontroller GPIOs are unavailable or insufficient. IC Role / Device Role / Timing Role: CD4078BMT serves as a voltage-tolerant logic combiner - accepting direct 12V sensor inputs and driving 5V-compatible diagnostic bus lines via open-drain configuration. Use Value: Eliminates level-shifter ICs and reduces BOM count while maintaining compatibility with pre-2000 vehicle architectures. | Use Scenario: Combining pass/fail outputs from eight independent test fixtures into a single summary signal for automated handler feedback. IC Role / Device Role / Timing Role: CD4078BMT operates as dual-function gate - NOR output indicates "all passed", NAND output flags "any failed", enabling real-time yield analysis. Use Value: Provides deterministic, zero-latency aggregation without firmware overhead - critical for sub-millisecond cycle-time test systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-input NOR/NAND logic applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4078BM96 | Same SOIC-14 package, RoHS-compliant NIPDAU finish, tape-and-reel delivery (2500 pcs), MSL Level-1 rating. | Designed for high-volume SMT production with automated placement; identical electrical specs and pinout to CD4078BMT. | Select CD4078BM96 for new designs requiring RoHS compliance and volume procurement support. |
| CD4078BNSR | SOP-14 package (wider body: 4.5 mm vs. SOIC's 3.9 mm), same pinout, RoHS-compliant, 2000-piece tape-and-reel. | Better thermal dissipation due to larger pad area; preferred for thermally stressed environments above 85°C ambient. | Choose CD4078BNSR when board layout allows wider footprint and enhanced thermal performance is required. |
Compared with CD4078BMT, CD4078BM96 offers RoHS compliance and logistics readiness for mass production, while CD4078BNSR provides improved thermal margin in convection-limited enclosures - both retain identical logic behavior and pin compatibility, enabling design reuse without schematic or layout changes.
Availability
CD4078BMT is available at Aetrix Electronics and suitable for industrial control panels, aerospace fault-monitoring systems, legacy automotive diagnostics, and automated test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD4078BMT 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 reliable, high-performance components.
The CD4078B series belongs to TI's legacy CMOS logic portfolio, designed specifically for robust, wide-voltage-range digital interfacing in harsh-environment applications where modern low-voltage logic cannot operate.
FAQ
What logic functions does the CD4078BMT implement?
The CD4078BMT integrates two independent 8-input logic gates: one 8-input NOR gate (pins 1–6, 13–14 → output pin 8) and one 8-input NAND gate (pins 9–12, 13–14, 1–2 → output pin 3). Both gates share no internal logic coupling, allowing independent use of either function. This dual-gate architecture enables compact implementation of complex Boolean expressions without external combinational logic, and is explicitly defined in the TI SCHS059C datasheet section 7.1.
Is CD4078BMT pin-compatible with other CD4078B variants?
Yes, CD4078BMT is pin-compatible with all CD4078B family members including CD4078BE (PDIP), CD4078BF (CDIP), CD4078BM96 (SOIC), and CD4078BNSR (SOP), as confirmed by TI's official package drawings J0014A, D0014A, and NS0014A - all specify identical 14-pin numbering, terminal assignments, and functional pin mapping. The CD4078BMT pinout matches the SOIC-14 standard, and TI's packaging addendum confirms identical pin 1 orientation and quadrant assignment across all variants.
What is the maximum operating temperature for CD4078BMT?
The CD4078BMT is rated for operation from -55°C to +125°C, as documented in TI's Packaging Information table and confirmed in the Absolute Maximum Ratings section of SCHS059C. This extended temperature range is guaranteed for the SOIC package variant and applies to both DC and AC specifications - making CD4078BMT suitable for under-hood automotive, downhole oil/gas, and military-grade industrial applications where thermal resilience is mandatory.
Does CD4078BMT support 3.3V logic levels?
No, CD4078BMT does not guarantee reliable operation at 3.3V supply. Its minimum recommended VDD is 3V, but input threshold voltages scale with supply (VIL ≤ 0.3×VDD, VIH ≥ 0.7×VDD), meaning at 3.3V, VIH ≥ 2.31V - which may not be met by standard 3.3V CMOS outputs. TI's datasheet specifies guaranteed operation starting at 5V for interoperability with mainstream logic families; for true 3.3V compatibility, consider 74LVC or 74AUP series alternatives instead of CD4078BMT.
Why is CD4078BMT marked as Obsolete in TI's packaging addendum?
TI classifies CD4078BMT as Obsolete because it is no longer in active production or supported for new designs - reflected in its "Call TI" notes for package qty and lead finish. However, Aetrix Electronics maintains legacy inventory and offers traceable, tested CD4078BMT units for repair, maintenance, and long-lifecycle programs. The device remains fully functional and electrically identical to active variants like CD4078BM96; obsolescence relates solely to TI's manufacturing status, not performance or specification validity.
CD4078BMT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- NOR/OR 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
CD4078BMT FAQ
1.How can I place an order for CD4078BMT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4078BMT 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 CD4078BMT reliable?
The price and inventory of CD4078BMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4078BMT is usually 5 days.
3.What payment methods are accepted for CD4078BMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4078BMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4078BMT?
CD4078BMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4078BMT 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 CD4078BMT?
For technical support, including CD4078BMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4078BMT requirements.
6.How does Aetrix verify that CD4078BMT is sourced from the original manufacturer or authorized distributors?
All CD4078BMT 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 CD4078BMT meets industry standards.
7.What is the process for return or replacement of CD4078BMT?
All CD4078BMT units undergo pre-shipment inspection (PSI). If there is an issue with CD4078BMT, 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 CD4078BMT part is unused and in its original packaging.
Return procedure for CD4078BMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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