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Texas Instruments CD74HC4049EE4
- Part No.:
- CD74HC4049EE4
- Manufacturer:
- Texas Instruments
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HC4049EE4.pdf
- Description:
- 6-CH, 2-V TO 6-V INVERTERS 16-PD
- Quantity:
- Payment:
- Shipping:
Inventory:1,485
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Product details
Overview
CD74HC4049EE4 from Texas Instruments is a high-speed CMOS hex inverting buffer with level-shifting capability, supporting 15-V input down-conversion to 0–5-V logic levels while operating from a 2–6-V supply. It delivers 6ns typical propagation delay at 5V/15pF, −55°C to 125°C operation, and drives up to 10 LSTTL loads per output. It serves in industrial interface translation between legacy high-voltage logic and modern low-voltage microcontrollers.
For engineers reviewing the CD74HC4049EE4 datasheet, CD74HC4049EE4 pinout, CD74HC4049EE4 application, or CD74HC4049EE4 equivalent, key selection criteria include its 16-V absolute input voltage rating, inverted level translation function, PDIP-16 package compatibility, and guaranteed operation across extended temperature ranges without external biasing.
Technical Context
The CD74HC4049EE4 implements six independent inverting buffer stages with modified input protection enabling safe 0–15-V input signal handling while powered from a low-voltage VCC (2–6 V). Its silicon-gate HC process ensures balanced rise/fall times and noise immunity of 30% of VCC at 5V.
This device operates as a unidirectional high-to-low voltage translator - inputs accept up to 16V (absolute max), outputs swing rail-to-rail between GND and VCC, and no external components are required for translation. It is not bidirectional and does not support low-to-high level shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Hex inverting buffer with high-voltage tolerant inputs (15-V max DC input) |
| Supply Voltage Range | 2 V to 6 V - enables direct interfacing with 3.3-V or 5-V systems |
| Propagation Delay | 6 ns typical at VCC = 5 V, CL = 15 pF - supports >30 MHz toggle rates in clean layouts |
| Input Voltage Range | −0.5 V to 16 V - allows direct connection to 12-V or 15-V logic without clamping diodes |
| Output Drive | ±25 mA per output - sufficient to drive multiple LSTTL loads or small capacitive buses |
| Operating Temperature | −55 °C to +125 °C - qualified for aerospace, automotive under-hood, and industrial control environments |
| Input Leakage | ±1 µA max at 15 V input - minimizes loading on high-impedance source circuits |
Pinout & Package
CD74HC4049EE4 is supplied in a 16-pin plastic dual in-line package (PDIP) with standard 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner when the notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 9, 11, 13 | Inverting Input (1A–6A) | Accepts 0–15-V logic signals; internally protected against negative ESD |
| 2, 4, 6, 10, 12, 14 | Inverting Output (1Y–6Y) | Swings 0–VCC; provides rail-to-rail CMOS output compatible with downstream 5-V or 3.3-V logic |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry |
| 16 | VCC | Positive supply rail (2–6 V); powers internal logic and defines output high level |
| 8, 15 | NC | No internal connection; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| High-to-low logic level translation | Converts 15-V input signals to 0–VCC output levels without external resistors or power supplies |
| Extended temperature operation | Guaranteed functionality from −55°C to +125°C enables use in harsh environmental applications |
| High noise immunity | 30% of VCC noise margin at both input thresholds ensures robust operation in electrically noisy industrial settings |
| Low quiescent current | Max 40 µA ICC at 125°C reduces standby power in battery-backed or energy-sensitive systems |
| ESD-protected inputs | Modified input structure withstands negative electrostatic discharge, eliminating need for external TVS devices |
Applications
| Industrial PLC I/O Interface | Automotive Sensor Signal Conditioning |
|---|---|
Use Scenario: Interfacing 12-V discrete sensor outputs (e.g., limit switches, relay contacts) to a 3.3-V microcontroller GPIO. IC Role / Device Role / Timing Role: Inverting level translator and buffer - converts 0/12-V signals to 0/3.3-V logic-compatible levels while providing current gain and noise rejection. Use Value: Eliminates need for discrete resistor dividers or optocouplers, reducing BOM count and PCB area while maintaining timing integrity (6 ns delay). | Use Scenario: Reading analog sensor status lines from legacy 15-V automotive subsystems (e.g., HVAC controls, body modules) into a 5-V CAN node MCU. IC Role / Device Role / Timing Role: High-voltage tolerant input conditioner - accepts 15-V open-collector or push-pull signals and delivers clean, inverted 0–5-V CMOS outputs synchronized to MCU clock domain. Use Value: Enables direct integration without voltage scaling networks, preserving signal edge fidelity and simplifying layout in space-constrained engine bay electronics. |
| Military Data Acquisition Front-End | Test Equipment Signal Isolation Stage |
Use Scenario: Conditioning TTL-compatible trigger pulses from legacy military test gear (15-V logic) before feeding into a radiation-hardened FPGA with 2.5-V I/O banks. IC Role / Device Role / Timing Role: Inverting translator and fanout buffer - provides level shift, signal inversion, and load isolation across six independent channels. Use Value: Supports full military temperature range (−55°C to +125°C) and eliminates timing skew between channels due to matched propagation delays (±2 ns typical variation). | Use Scenario: Isolating high-voltage digital stimulus signals (e.g., 12-V pulse generators) from sensitive 3.3-V logic analyzers or oscilloscope trigger inputs. IC Role / Device Role / Timing Role: Protective inverter stage - blocks DC and transient overvoltage from reaching measurement equipment while preserving pulse polarity and timing. Use Value: Prevents damage to test equipment inputs via built-in 16-V absolute maximum input rating and ESD-hardened inputs, avoiding costly external protection circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH162244DGGR | 16-bit non-inverting LVTH buffer; 3.3-V only supply; max 3.6-V input; no high-voltage translation | Designed for bus buffering in 3.3-V systems, not high-voltage level shifting | Select only if interfacing 3.3-V logic to other 3.3-V logic with high drive strength needs |
| 74LVC1G17GW,125 | Single Schmitt-trigger inverter; 1.65–5.5-V supply; max 5.5-V input; no 15-V tolerance | Provides hysteresis for noisy signals but lacks high-voltage input capability | Choose for noise-immune signal conditioning within low-voltage domains only |
Compared with SN74LVTH162244DGGR and 74LVC1G17GW,125, the CD74HC4049EE4 uniquely supports true 15-V-to-5-V inverting translation in a single 16-pin PDIP package without external components - making it irreplaceable for legacy system integration where input voltage exceeds standard logic rails.
Availability
CD74HC4049EE4 is available at Aetrix Electronics and suitable for industrial PLC I/O interface, automotive sensor signal conditioning, military data acquisition front-end, and test equipment signal isolation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC4049EE4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
The CD74HC4049EE4 belongs to TI's legacy high-speed CMOS (HC) logic family, designed specifically for robust, low-power, high-voltage-tolerant interfacing in mission-critical industrial and defense systems where reliability across extreme temperatures is mandatory.
FAQ
What is the maximum input voltage the CD74HC4049EE4 can safely handle?
The CD74HC4049EE4 has an absolute maximum input voltage rating of −0.5 V to 16 V, with functional operation specified up to 15 V DC. This allows direct connection to 12-V or 15-V logic sources without external attenuation. Exceeding 16 V risks permanent damage, and inputs below −0.5 V require current limiting to avoid exceeding −20 mA diode current limits. The CD74HC4049EE4's modified input protection structure enables this high-voltage tolerance while maintaining CMOS compatibility.
Does the CD74HC4049EE4 support bidirectional level translation?
No, the CD74HC4049EE4 supports only unidirectional high-to-low level translation: inputs accept 0–15-V signals, outputs swing 0–VCC. It cannot translate low-voltage signals to higher voltages, nor does it support reverse signal flow. Each channel is strictly inverting and isolated - there is no internal feedback path or bidirectional control logic. For bidirectional translation, discrete solutions or dedicated translators like TXB0108 must be used instead of the CD74HC4049EE4.
Can the CD74HC4049EE4 operate from a 3.3-V supply while accepting 12-V inputs?
Yes, the CD74HC4049EE4 operates correctly from a 3.3-V supply while accepting 12-V inputs on its A pins. Its input protection structure isolates the high-voltage input from the internal 3.3-V logic core, allowing safe down-translation. Outputs will swing 0–3.3 V, fully compatible with 3.3-V CMOS receivers. This behavior is explicitly validated in the datasheet's operating conditions and absolute maximum ratings tables for the CD74HC4049EE4.
What is the purpose of the NC pins on the CD74HC4049EE4?
Pins 8 and 15 of the CD74HC4049EE4 are designated No Connect (NC) and have no internal bond wire or circuit connection. They must remain unconnected in PCB layout - routing traces to or placing vias on these pins may cause mechanical stress or unintended coupling. The NC designation is confirmed in the functional diagram, pinout diagram, and ordering information table for the CD74HC4049EE4, and deviating from this violates TI's recommended usage guidelines.
How does the CD74HC4049EE4 differ from the CD74HC4050EE4?
The CD74HC4049EE4 provides six inverting buffers, while the CD74HC4050EE4 provides six non-inverting buffers - identical in voltage ratings, timing, packaging, and temperature range. Both share the same pinout except for logic polarity. If signal inversion is required (e.g., correcting active-low logic conventions), CD74HC4049EE4 is appropriate; otherwise, CD74HC4050EE4 preserves input polarity. Neither performs level translation in the opposite direction.
CD74HC4049EE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74HC4049EE4 FAQ
1.How can I place an order for CD74HC4049EE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC4049EE4 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 CD74HC4049EE4 reliable?
The price and inventory of CD74HC4049EE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC4049EE4 is usually 5 days.
3.What payment methods are accepted for CD74HC4049EE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC4049EE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC4049EE4?
CD74HC4049EE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC4049EE4 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 CD74HC4049EE4?
For technical support, including CD74HC4049EE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC4049EE4 requirements.
6.How does Aetrix verify that CD74HC4049EE4 is sourced from the original manufacturer or authorized distributors?
All CD74HC4049EE4 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 CD74HC4049EE4 meets industry standards.
7.What is the process for return or replacement of CD74HC4049EE4?
All CD74HC4049EE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC4049EE4, 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 CD74HC4049EE4 part is unused and in its original packaging.
Return procedure for CD74HC4049EE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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