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Texas Instruments CD74HCT368MT
- Part No.:
- CD74HCT368MT
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT368MT.pdf
- Description:
- IC BUFFER INVERT 5.5V 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,049
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Product details
Overview
CD74HCT368MT from Texas Instruments is a high-speed CMOS hex inverting buffer/line driver with three-state outputs, designed for bus interface and data routing in industrial control and instrumentation systems. It features dual independent three-state enable controls (1OE, 2OE), 4.5 V to 5.5 V operation, typical propagation delay of 11 ns at VCC = 5 V and CL = 15 pF, and drives up to 15 LSTTL loads.
For engineers reviewing the CD74HCT368MT datasheet, CD74HCT368MT pinout, CD74HCT368MT application, or CD74HCT368MT equivalent, this device is selected for robust 5-V logic-level translation, high-current bus driving, and wide-temperature (-55°C to +125°C) digital signal conditioning where inverting buffering with output disable control is required.
Technical Context
The CD74HCT368MT implements six independent inverting buffer gates grouped into two controllable sections: four gates (1Y1–1Y4) enabled by 1OE, and two gates (2Y1–2Y2) enabled by 2OE. Each output supports high-current drive (±4 mA at VOH/VOL) and exhibits balanced rise/fall times under 15 ns at 5 V.
It operates strictly within the HCT family's LSTTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), ensuring direct interoperability with legacy TTL logic while delivering CMOS power efficiency (ICC ≤ 160 μA over full temperature range) and noise immunity (NIL/NIH = 30% of VCC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and mixed-voltage logic systems without level-shifting. |
| Propagation Delay (tpd) | 11 ns (typ) at VCC = 5 V, CL = 15 pF - Enables reliable operation in high-speed digital buses up to ~45 MHz clock-equivalent rates. |
| Output Drive | ±4 mA (IOH/IOL) - Sustains signal integrity when driving heavy capacitive loads (e.g., >100 pF) or multiple LSTTL inputs (up to 15). |
| Operating Temperature | -55°C to +125°C - Qualified for extended industrial, aerospace, and automotive under-hood applications without derating. |
| Three-State Leakage (IOZ) | ±10 μA max at -55°C to +125°C - Minimizes bus contention current and power loss during output disable states. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - Guarantees unambiguous logic recognition from standard TTL outputs without external biasing. |
| Power Dissipation Cap. (CPD) | 42 pF - Used to calculate dynamic power: PD = VCC² × fi × (CPD + CL); enables accurate thermal modeling at known toggle rates. |
Pinout & Package
CD74HCT368MT is supplied in a 16-pin SOIC (D) package with nominal body size 9.90 mm × 3.90 mm, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) Level-1 (unlimited floor life at <30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1OE, 2OE - Output Enable Inputs | Active-low controls: 1OE enables Y1–Y4; 2OE enables Y1′–Y2′. Both must be low for output assertion; either high forces associated outputs to high-impedance. |
| 2, 4, 6, 9, 12, 14 | A1–A4, A1′, A2′ - Data Inputs | Respective inverted inputs to each buffer stage; all CMOS-compatible with II ≤ 1 μA and TTL-compatible thresholds. |
| 3, 5, 7, 10, 11, 13 | Y1–Y4, Y1′, Y2′ - Inverting Outputs | True-inverted buffered outputs with three-state capability; capable of sourcing/sinking ±4 mA while maintaining VOL ≤ 0.4 V and VOH ≥ 3.7 V. |
| 8, 16 | GND, VCC - Power Supply | Single 5-V supply rail; requires local 0.1-μF bypass capacitor at VCC pin to suppress switching noise and ensure stable timing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent three-state enables | Allows selective isolation of two functional groups (4+2 buffers) on shared bus lines without external gating logic. |
| LSTTL-input compatible voltage thresholds | Eliminates need for pull-up resistors or level translators when interfacing with legacy 74LS/74ALS families. |
| High fanout (15 LSTTL loads) | Reduces gate count in bus-driving applications-replaces multiple discrete buffers or line drivers in backplane designs. |
| Wide temperature range (-55°C to +125°C) | Supports deployment in harsh environments including motor control enclosures, avionics bays, and downhole instrumentation. |
| Low quiescent ICC (≤160 μA) | Enables use in always-on subsystems (e.g., watchdog interfaces, sensor multiplexers) without significant standby power penalty. |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
|
Use Scenario: Expanding digital input/output capacity in programmable logic controllers using shared parallel data buses. IC Role / Device Role / Timing Role: Inverting three-state buffer isolating CPU data bus from field I/O modules; enables hot-swap-safe module insertion/removal. Use Value: Dual OE pins allow independent enable/disable of group A (4 channels) and group B (2 channels), simplifying modular firmware-driven bus arbitration. |
Use Scenario: Interfacing microcontroller GPIOs to high-capacitance wiring harnesses in door module or lighting control units. IC Role / Device Role / Timing Role: Inverting buffer translating MCU logic levels to robust 5-V signals capable of driving long traces (>30 cm) with minimal edge degradation. Use Value: 4-mA drive strength and <15-ns transition time maintain signal fidelity across noisy vehicle electrical environments. |
| Test Equipment Signal Routing | Avionics Data Acquisition Interface |
|
Use Scenario: Multiplexing and conditioning digital test vectors between pattern generators and DUTs in automated test systems. IC Role / Device Role / Timing Role: Hex inverting buffer providing signal inversion and bus isolation between stimulus source and measurement front-end. Use Value: Guaranteed 11-ns propagation delay and matched tPLH/tPHL support precise timing alignment across multiple parallel channels. |
Use Scenario: Conditioning ARINC 429 or MIL-STD-1553B auxiliary control signals in flight data recorders and sensor concentrators. IC Role / Device Role / Timing Role: Robust 5-V logic buffer with radiation-tolerant SOIC packaging and -55°C to +125°C operation for non-critical command path conditioning. Use Value: Extended temperature qualification and low IOZ leakage (<10 μA) prevent false triggering in high-reliability, low-duty-cycle monitoring circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT368N | Same logic function, pinout, and DC specs; differs in package (PDIP-16 vs SOIC-16) and MSL rating (N/A vs Level-1). | Preferred for through-hole prototyping or legacy board rework where SOIC footprint unavailable. | Select SN74HCT368N only when manual soldering or socket-based validation is required; not suitable for automated SMT assembly. |
| CD74HC368M | Identical pinout and architecture but HC-family: 2–6 V operation, higher VIH/VIL thresholds (1.5 V/0.5 V @ 2 V), no LSTTL input compatibility. | Suitable for mixed-supply systems (e.g., 3.3-V MCU with 5-V peripherals) but requires external level shifting for TTL inputs. | Choose CD74HC368M only when operating outside 4.5–5.5 V range or when interfacing exclusively with CMOS sources. |
Compared with SN74HCT368N and CD74HC368M, CD74HCT368MT offers optimal balance of LSTTL compatibility, SOIC manufacturability, and extended temperature resilience-making it the preferred choice for new industrial and automotive SMT designs requiring guaranteed 5-V bus interfacing.
Availability
CD74HCT368MT is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and avionics applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CD74HCT368MT 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 decades of heritage in high-reliability logic families.
The CD74HCT368MT belongs to TI's CD74HCT high-speed CMOS logic portfolio, engineered for drop-in replacement of legacy TTL in industrial and military-grade systems demanding robust 5-V operation and wide-temperature performance.
FAQ
What is the maximum operating frequency supported by CD74HCT368MT?
The CD74HCT368MT does not specify a maximum clock frequency, but its typical propagation delay of 11 ns (at VCC = 5 V, CL = 15 pF) and output transition time of ≤18 ns support reliable data rates up to approximately 45 MHz in well-terminated bus configurations. System-level timing must account for board trace capacitance and load conditions per the switching characteristics table in the official datasheet.
Can CD74HCT368MT drive a 100-pF bus capacitance reliably?
Yes, CD74HCT368MT can drive 100-pF loads reliably: its high-current outputs (±4 mA) and low output impedance maintain signal integrity, and measured tpd increases only moderately-from 11 ns (CL = 15 pF) to ≤38 ns (CL = 50 pF). For 100-pF, expected tpd remains under 55 ns, preserving setup/hold margins in most synchronous designs.
Is CD74HCT368MT pin-compatible with CD74HC368M?
Yes, CD74HCT368MT and CD74HC368M share identical pinout, package (SOIC-16), and functional block diagram. However, they differ electrically: CD74HCT368MT accepts LSTTL inputs (VIL ≤ 0.8 V), while CD74HC368M requires CMOS-level inputs (VIL ≤ 0.5 V @ 2 V). Swapping them requires verifying source logic family compatibility.
Does CD74HCT368MT require external pull-up or pull-down resistors on unused inputs?
Yes, all unused inputs on CD74HCT368MT must be terminated-either to VCC or GND-to prevent floating nodes that cause increased ICC, erratic output behavior, or ESD susceptibility. TI recommends tying unused A-inputs to GND and unused OE inputs to VCC (to force outputs into high-Z) unless system logic dictates otherwise.
What is the thermal resistance (RθJA) of CD74HCT368MT in SOIC package?
The CD74HCT368MT in SOIC (D) package has a junction-to-ambient thermal resistance (RθJA) of 73°C/W, as specified in the Thermal Information section of the datasheet. This value assumes standard JEDEC PCB mounting conditions (2s2p copper layers); actual thermal performance improves with added copper pour or thermal vias beneath the pad.
CD74HCT368MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 2, 4 (Hex)
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HCT368MT FAQ
1.How can I place an order for CD74HCT368MT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT368MT 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 CD74HCT368MT reliable?
The price and inventory of CD74HCT368MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT368MT is usually 5 days.
3.What payment methods are accepted for CD74HCT368MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT368MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT368MT?
CD74HCT368MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT368MT 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 CD74HCT368MT?
For technical support, including CD74HCT368MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT368MT requirements.
6.How does Aetrix verify that CD74HCT368MT is sourced from the original manufacturer or authorized distributors?
All CD74HCT368MT 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 CD74HCT368MT meets industry standards.
7.What is the process for return or replacement of CD74HCT368MT?
All CD74HCT368MT units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT368MT, 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 CD74HCT368MT part is unused and in its original packaging.
Return procedure for CD74HCT368MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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