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Texas Instruments CD74HC4049PWT
- Part No.:
- CD74HC4049PWT
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD74HC4049PWT.pdf
- Description:
- IC BUFFER INVERT 6V 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,903
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Product details
Overview
CD74HC4049PWT from Texas Instruments is a high-speed CMOS hex inverting buffer with level-shifting capability, supporting 15-V input logic down-converted to 0–5-V output levels while operating from a 2–6-V VCC supply. It delivers 6ns typical propagation delay at 5V/15pF, operates across –55°C to 125°C, and drives up to 10 LSTTL loads per output. It is used in industrial interface translation between legacy high-voltage logic and modern low-voltage microcontrollers.
For engineers reviewing the CD74HC4049PWT datasheet, CD74HC4049PWT pinout, CD74HC4049PWT application, or CD74HC4049PWT equivalent, key selection considerations include its 15-V tolerant inputs, inverting logic function, TSSOP-16 package thermal performance (θJA = 108°C/W), and compatibility with HC-family timing and noise immunity specs (NIL/NIH = 30% of VCC).
Technical Context
The CD74HC4049PWT implements six independent inverting buffer stages using silicon-gate CMOS technology with modified input protection that enables robust high-to-low voltage level translation-e.g., 15-V input pulses converted to 0–5-V CMOS-compatible outputs. Its input structure withstands –0.5V to +16V, exceeding standard CMOS input limits.
It operates over full military temperature range (–55°C to 125°C) with supply voltage flexibility (2V–6V), balanced tPLH/tPHL and tTLH/tTHL transition times, and quiescent current under 40 µA at 6V. No internal pull-ups, latches, or enable controls are present-each channel is a direct inverting path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Hex inverting buffer - provides logical inversion and level translation without added control signals. |
| Input Voltage Range | –0.5 V to +16 V - supports direct interfacing to 12-V/15-V logic families (e.g., TTL, 4000-series) while powered from 5-V or lower rails. |
| Supply Voltage (VCC) | 2 V to 6 V - enables operation from single Li-ion cells (3.3 V) up to 5-V systems; not compatible with 3.3-V-only logic without derating. |
| Propagation Delay | 6 ns typical at VCC = 5 V, CL = 15 pF - ensures sub-10-ns timing for high-speed digital handshaking in mixed-voltage systems. |
| Output Drive | ±25 mA per output - sufficient to drive multiple LSTTL loads (10 fanout) or small capacitive buses without external buffers. |
| Operating Temperature | –55 °C to +125 °C - qualified for extended industrial, automotive under-hood, and aerospace applications requiring wide thermal margin. |
| Input Noise Immunity | NIL = NIH = 30% of VCC at VCC = 5 V - rejects >1.5-V noise spikes on inputs, improving reliability in electrically noisy environments. |
Pinout & Package
TSSOP-16 package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad optional, moisture sensitivity level 1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 9, 11, 13 | Input (1A–6A) | CMOS-compatible inputs accepting –0.5 V to +16 V; each drives one inverting buffer stage. |
| 2, 4, 6, 10, 12, 14 | Output (1Y–6Y) | Inverted buffered outputs referenced to VCC; rail-to-rail swing (0 V to VCC) with ±25 mA drive capability. |
| 7 | GND | Ground reference for all I/O and internal circuitry; must be low-impedance for noise immunity and timing stability. |
| 16 | VCC | Positive supply (2–6 V); powers all six buffers and defines output logic high level. |
| 8, 15 | NC | No-connect pins - internally unconnected; must remain floating or tied to GND/VCC only if required by board layout (no functional impact). |
Key Features
| Feature | Design Value |
|---|---|
| High-to-low level translation | Converts up to 15-V input signals to 0–VCC output logic levels using only a single low-voltage supply - eliminates need for dual-supply translators or discrete resistor-divider networks. |
| Extended input voltage tolerance | Withstands –0.5 V to +16 V on inputs regardless of VCC setting - protects against ESD, back-driving, and bus contention in mixed-voltage interconnects. |
| Low quiescent power | ICC ≤ 40 µA at 6 V and 125 °C - reduces system standby power in battery-operated or thermally constrained designs. |
| High noise immunity | NIL/NIH = 30% of VCC at 5 V - rejects common-mode noise and ground bounce better than standard LS-TTL or unbuffered CMOS. |
| Wide temperature operation | Specified from –55 °C to +125 °C - suitable for deployment in harsh environments including motor control, avionics, and downhole instrumentation. |
Applications
| Industrial PLC I/O Interface | Automotive Sensor Signal Conditioning |
|---|---|
Use Scenario: Interfacing 12-V discrete sensor outputs (limit switches, relay contacts) to a 3.3-V microcontroller GPIO input. IC Role / Device Role / Timing Role: Inverting level translator and noise-filtering buffer - converts 0/12-V signals to clean 0/3.3-V logic while rejecting EMI-induced glitches. Use Value: Eliminates external voltage dividers and Schmitt triggers; maintains <6 ns propagation delay for real-time response in safety-critical ladder logic scanning. | Use Scenario: Converting 5-V CAN transceiver TXD signals to 3.3-V MCU UART inputs in an engine control unit. IC Role / Device Role / Timing Role: Inverting logic-level shifter - ensures signal integrity during voltage domain crossing without adding latency or skew between channels. Use Value: Supports simultaneous multi-channel translation (e.g., 6x isolated UART lines) with matched tPLH/tPHL - avoids timing skew-induced framing errors. |
| Military Data Acquisition Systems | Legacy Equipment Modernization |
Use Scenario: Integrating MIL-STD-1553B-compatible 15-V pulse inputs into a radiation-tolerant FPGA-based data recorder. IC Role / Device Role / Timing Role: High-reliability inverting buffer with extended voltage and temperature rating - provides deterministic logic inversion under extreme thermal cycling. Use Value: Qualified to –55°C to +125°C with 16-V input tolerance - meets DO-254/DO-160 environmental requirements without derating or additional protection circuitry. | Use Scenario: Retrofitting aging test equipment with 5-V microcontrollers while retaining original 12-V front-panel switch matrix wiring. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for obsolete 4049B or 74LS04-based translators - preserves PCB layout and firmware logic polarity. Use Value: Maintains identical 16-pin TSSOP footprint and inverting function - enables field upgrade without redesign or calibration revalidation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVX4049PW | Lower VCC range (2–3.6 V), max input = 7 V, no 15-V tolerance; 5.5 ns typical delay at 3.3 V. | Suitable only for 3.3-V systems with ≤7-V inputs; not usable in 12-V/15-V legacy interface scenarios. | Select when interfacing exclusively with 3.3-V logic and lower power (<10 µA ICC) is critical - not a functional replacement for CD74HC4049PWT's high-voltage translation. |
| 74AC14PC | Schmitt-trigger inputs (not standard CMOS), 6-V max VCC, no >6-V input support; 7 ns typical delay at 5 V. | Provides hysteresis for noisy inputs but lacks high-voltage input tolerance and inverting-only function - requires external inverters for pure inversion. | Choose only when input signal conditioning (noise rejection via hysteresis) is prioritized over voltage translation - incompatible with 12-V/15-V source interfacing. |
Compared with SN74LVX4049PW and 74AC14PC, CD74HC4049PWT uniquely combines 15-V input tolerance, true inverting buffering, and full –55°C to +125°C operation in a single TSSOP-16 device - making it irreplaceable for legacy voltage domain bridging where input overvoltage resilience is mandatory.
Availability
CD74HC4049PWT is available at Aetrix Electronics and suitable for industrial PLC I/O interface, automotive sensor signal conditioning, military data acquisition systems, and legacy equipment modernization requiring stable component supply across extended temperature and voltage ranges.
Supply support for CD74HC4049PWT 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 CD74HC4049PWT belongs to TI's HC-series high-speed CMOS logic portfolio, designed specifically for robust voltage-level translation and noise-immune digital interfacing in demanding industrial, automotive, and defense applications.
FAQ
What is the maximum input voltage the CD74HC4049PWT can safely accept?
The CD74HC4049PWT supports an absolute maximum input voltage range of –0.5 V to +16 V, independent of VCC. This allows direct connection to 12-V or 15-V logic sources while operating from a 3.3-V or 5-V supply. Exceeding +16 V risks permanent damage per Absolute Maximum Ratings.
Does the CD74HC4049PWT require external pull-up or pull-down resistors on its inputs?
No, the CD74HC4049PWT does not require external pull-up or pull-down resistors. Its CMOS inputs have high impedance and defined thresholds (VIH ≥ 3.15 V, VIL ≤ 1.35 V at VCC = 4.5 V). Floating inputs are not recommended - unused inputs should be tied to VCC or GND to prevent oscillation and excess current draw.
Can the CD74HC4049PWT be used as a non-inverting buffer?
No, the CD74HC4049PWT is strictly an inverting hex buffer. Each of its six channels performs logical inversion (A → Y̅). To achieve non-inverting behavior, two CD74HC4049PWT stages must be cascaded per signal path - but this adds propagation delay and consumes extra pins. For non-inverting translation, CD74HC4050PWT is the functional counterpart.
Is the CD74HC4049PWT pin-compatible with older CD74HC4049 variants like CD74HC4049M or CD74HC4049E?
Yes, the CD74HC4049PWT shares identical pinout and logic functionality with other CD74HC4049 variants (e.g., PDIP CD74HC4049E, SOIC CD74HC4049M96). All use the same 16-pin configuration: six inverting pairs (A/Y), VCC, GND, and two NC pins. Only package dimensions and thermal characteristics differ - TSSOP offers higher density and better high-frequency performance.
What is the thermal resistance (θJA) of the CD74HC4049PWT in its TSSOP package?
The CD74HC4049PWT in the TSSOP-16 (PW) package has a specified junction-to-ambient thermal resistance (θJA) of 108°C/W under JEDEC-standard conditions. This value assumes a 2-layer PCB with minimal copper; actual θJA improves significantly with proper thermal vias and copper pour - critical for sustained operation near 125°C ambient.
CD74HC4049PWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 6
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- Push-Pull
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
CD74HC4049PWT FAQ
1.How can I place an order for CD74HC4049PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC4049PWT 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 CD74HC4049PWT reliable?
The price and inventory of CD74HC4049PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC4049PWT is usually 5 days.
3.What payment methods are accepted for CD74HC4049PWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC4049PWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC4049PWT?
CD74HC4049PWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC4049PWT 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 CD74HC4049PWT?
For technical support, including CD74HC4049PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC4049PWT requirements.
6.How does Aetrix verify that CD74HC4049PWT is sourced from the original manufacturer or authorized distributors?
All CD74HC4049PWT 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 CD74HC4049PWT meets industry standards.
7.What is the process for return or replacement of CD74HC4049PWT?
All CD74HC4049PWT units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC4049PWT, 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 CD74HC4049PWT part is unused and in its original packaging.
Return procedure for CD74HC4049PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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