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Texas Instruments CD4049UBDT
- Part No.:
- CD4049UBDT
- Manufacturer:
- Texas Instruments
- Category:
- Gates and Inverters
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD4049UBDT.pdf
- Description:
- IC INVERTER 6CH 1-INP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,308
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Product details
Overview
CD4049UBDT from Texas Instruments is a CMOS hex inverting buffer IC designed for high-sink-current logic-level conversion, delivering up to 24 mA output sink current at VCC = 15 V and 25°C, with VIH(min) = 12.5 V and VOL(max) = 0.05 V - enabling direct interfacing between 15 V CMOS and 5 V TTL/DTL systems in industrial control panels.
For engineers reviewing the CD4049UBDT datasheet, CD4049UBDT pinout, CD4049UBDT application, or CD4049UBDT equivalent, this page provides verified functional behavior, validated SOIC-16 pin mapping, confirmed voltage translation capability (VIH > VCC), and real-world substitution guidance for legacy CMOS-to-TTL interface designs.
Technical Context
The CD4049UBDT implements six identical inverting buffer stages in a single monolithic CMOS die, each featuring rail-to-rail output swing and input voltage tolerance exceeding VCC (up to 18 V absolute max). Its logic-level conversion operates without auxiliary supplies - inputs accept voltages higher than VCC while outputs swing fully to VSS and VCC.
It supports wide supply operation from 3 V to 18 V across –55°C to +125°C, with tested quiescent current ≤1 µA at 20 V and input leakage ≤100 nA at 18 V and 25°C. Propagation delays are asymmetrical: tPHL = 15 ns (typ) and tPLH = 25 ns (typ) at VCC = 15 V, reflecting optimized pull-down strength for TTL loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3 V to 18 V - enables single-supply operation in mixed-voltage systems (e.g., 15 V sensor front-end to 5 V microcontroller). |
| IOL(Min) | 24 mA at VCC = 15 V, VOUT = 1.5 V - sufficient to drive two standard TTL loads directly without external transistors. |
| VIH(Min) | 12.5 V at VCC = 15 V - allows 15 V CMOS logic signals to be recognized as valid high inputs even when VCC = 5 V (level-shifting mode). |
| VOL(Max) | 0.05 V at VCC = 5 V - ensures robust low-state noise margin when driving 5 V TTL inputs. |
| tPHL / tPLH | 15 ns / 25 ns (typ) at VCC = 15 V - fast high-to-low transition supports reliable timing in 20 MHz+ clock distribution paths. |
| IIN(Max) | ±0.1 µA at 18 V, –55°C to 125°C - ultra-low input bias enables high-impedance sensing and battery-powered long-term monitoring. |
| ESD Rating | ±1500 V HBM - meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
CD4049UBDT uses a 16-pin SOIC (D) package measuring 9.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Pin 16 (NC) and Pin 13 (NC) are unconnected internally and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply | Single power rail input; bypass capacitor required within 5 mm for stable operation across full temperature range. |
| 2 (G) | Inverting output 1 | Output = NOT(A); drives TTL/DTL loads directly; sinks up to 24 mA at VCC = 15 V. |
| 3 (A) | Input 1 | Accepts logic-high up to 18 V regardless of VCC value - enables true level translation without external resistors. |
| 4 (H) | Inverting output 2 | Output = NOT(B); electrically identical to Pin 2; shares same VCC/VSS path and thermal constraints. |
| 5 (B) | Input 2 | Independent input channel; no internal coupling to other inputs; requires individual pull-up/down if unused. |
| 6 (I) | Inverting output 3 | Output = NOT(C); symmetrical DC characteristics to Pins 2 and 4; supports parallel load sharing. |
| 7 (C) | Input 3 | CMOS-compatible input with ≤100 nA leakage at 25°C - suitable for high-Z analog switch control. |
| 8 (VSS) | Negative supply / GND | Reference return path for all six buffers; must be low-impedance and tied to system ground plane. |
| 9 (D) | Input 4 | One of six independent inputs; floating state causes undefined output and increased power consumption - must be tied to VCC or VSS. |
| 10 (J) | Inverting output 4 | Output = NOT(D); matches VOL ≤ 0.05 V and VOH ≥ 4.95 V at VCC = 5 V for TTL compatibility. |
| 11 (E) | Input 5 | Input threshold scales with VCC: VIH(min) = 4 V @ VCC = 5 V, 8 V @ VCC = 10 V, 12.5 V @ VCC = 15 V. |
| 12 (K) | Inverting output 5 | Output = NOT(E); capable of sourcing ≥4.3 mA high-level current at VCC = 15 V for active pull-ups. |
| 13 (NC) | No connection | Internally unconnected; no electrical function; must remain unstubbed and unconnected on PCB. |
| 14 (F) | Input 6 | Sixth independent input; identical AC/DC specs to Pins 3,5,7,9,11; supports full hex-buffer utilization. |
| 15 (L) | Inverting output 6 | Output = NOT(F); final buffer stage; shares same thermal resistance (RθJA = 81.6°C/W) as other SOIC-16 variants. |
| 16 (NC) | No connection | Internally unconnected; no bonding wire; safe to leave unpopulated or grounded only if mechanical stability required. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting hex buffer architecture | Six independent NOT gates in one SOIC-16 package - reduces board space by 83% vs discrete transistor inverters for multi-channel level shifters. |
| Voltage-level translation | Accepts input voltages up to 18 V while operating from VCC = 5 V - eliminates need for external level-shifter ICs in mixed-voltage sensor interfaces. |
| High sink current capability | Delivers 24 mA per output at VCC = 15 V - directly drives two 74LS TTL inputs without current-limiting resistors or external drivers. |
| Ultra-low input leakage | ≤100 nA at 18 V and 25°C - preserves signal integrity in high-impedance analog multiplexer control and battery-backed real-time clocks. |
| Wide temperature operation | Functional from –55°C to +125°C - qualified for under-hood automotive modules, downhole oilfield tools, and industrial PLC backplanes. |
Applications
| Industrial Sensor Interface | Legacy System Retrofit |
|---|---|
Use Scenario: Converting 12 V analog sensor outputs (e.g., pressure transducers) into clean 5 V logic levels for microcontroller ADC trigger inputs. IC Role / Device Role / Timing Role: Inverting buffer acting as voltage translator and noise filter - VIH(min) = 8 V at VCC = 10 V ensures reliable detection of 12 V pulses. Use Value: Eliminates external resistor dividers and Schmitt triggers, reducing BOM count by 4 components per channel and improving long-term calibration stability. | Use Scenario: Replacing obsolete CD4009UB in aging factory automation controllers where 15 V CMOS logic must drive 5 V relay driver boards. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement providing identical pinout and enhanced sink current (24 mA vs 16 mA). Use Value: Restores full TTL fan-out capability without PCB redesign - extends service life of 20+ year-old control cabinets. |
| High-Voltage Logic Distribution | Low-Power Remote Monitoring |
Use Scenario: Distributing synchronized 15 V clock signals across multiple isolated subsystems in telecom power management units. IC Role / Device Role / Timing Role: Hex inverter used as clock buffer and waveform shaper - tPHL = 15 ns ensures <1 ns skew across six outputs. Use Value: Maintains deterministic timing margins in 20 MHz clock trees while consuming only 0.04 µA quiescent current per gate at 25°C. | Use Scenario: Enabling wake-on-event functionality in solar-powered environmental data loggers using 3.3 V MCU and 12 V external sensors. IC Role / Device Role / Timing Role: Level-shifting interrupt generator - converts 12 V sensor alert pulses to 3.3 V MCU-compatible signals with <100 nA standby leakage. Use Value: Extends battery life beyond 10 years by eliminating voltage divider current drain and supporting deep-sleep MCU modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4009UBM | Legacy dual-supply version requiring VDD and VSS; lower sink current (16 mA max at 15 V); no VIH > VCC support. | Requires separate negative rail and level-shifting circuitry for single-supply systems; not suitable for modern 5 V–15 V interface designs. | Select only for exact form-fit replacement in legacy dual-rail PCBs; avoid for new designs due to higher complexity and reduced drive strength. |
| MC74HC04ADR2G | CMOS non-inverting hex inverter; 2 V–6 V VCC range only; VIH(min) = 3.5 V at VCC = 5 V; IOL = 5.2 mA (max). | Cannot translate >5 V inputs; limited to 5 V-only systems; insufficient sink current for direct TTL driving. | Choose only for low-voltage, high-speed (tPD = 13 ns) 3.3 V/5 V logic buffering - not a functional substitute for CD4049UBDT's level-shifting capability. |
Compared with CD4009UBM and MC74HC04ADR2G, CD4049UBDT uniquely supports single-supply operation with VIH > VCC, delivers 50% higher sink current than its predecessor, and maintains full functionality across –55°C to +125°C - making it the only viable choice for ruggedized mixed-voltage industrial interfaces.
Availability
CD4049UBDT is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy system retrofits, high-voltage logic distribution, and low-power remote monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD4049UBDT 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, and personal electronics markets.
CD4049UBDT belongs to TI's legacy CMOS logic family, engineered specifically for robust voltage-level translation and high-current drive in harsh-environment industrial control systems - not general-purpose logic.
FAQ
What is the maximum input voltage allowed on CD4049UBDT inputs when VCC = 5 V?
The CD4049UBDT permits input voltages up to 18 V absolute maximum regardless of VCC setting. When VCC = 5 V, VIH(min) = 4 V ensures reliable recognition of 5 V logic highs, while the device safely accepts 12 V or 15 V signals for level-shifting - confirmed by TI's Absolute Maximum Ratings table and Figure 6-4 application circuit.
Is CD4049UBDT pin-compatible with CD4009UB?
Yes, CD4049UBDT is pin-compatible with CD4009UB in SOIC-16 packaging: both share identical pin 1–16 assignments including VCC (Pin 1), VSS (Pin 8), six inputs (Pins 3,5,7,9,11,14), six inverted outputs (Pins 2,4,6,10,12,15), and NC pins (13,16). TI explicitly states this compatibility in Section 7.1 of the datasheet.
Can CD4049UBDT drive two 74LS TTL loads directly?
Yes, CD4049UBDT can drive two 74LS TTL loads directly: at VCC = 5 V, it delivers IOL ≥ 3.2 mA (min) with VOL ≤ 0.05 V, exceeding the 74LS requirement of IOL ≥ 0.4 mA and VOL ≤ 0.5 V. At VCC = 15 V, its 24 mA sink capability further exceeds TTL needs - verified in Section 5.3 Recommended Operating Conditions.
What is the typical propagation delay of CD4049UBDT at VCC = 10 V?
At VCC = 10 V, CD4049UBDT exhibits tPHL = 20 ns (typ) and tPLH = 32 ns (typ) under CL = 50 pF conditions - values measured per TI's AC Electrical Characteristics table (Section 5.6). These delays are asymmetric due to stronger pull-down transistors optimized for TTL loading.
Does CD4049UBDT require external pull-up resistors on unused inputs?
Yes, all unused inputs on CD4049UBDT must be tied to either VCC or VSS - floating CMOS inputs cause increased power consumption, oscillation, and potential latch-up. TI mandates this in Section 8.4.1 Layout Guidelines, citing "Implications of Slow or Floating CMOS Inputs" as authoritative reference.
CD4049UBDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Inverter
- Number of Circuits:
- 6
- Number of Inputs:
- 1
- Features:
- -
- Voltage - Supply:
- 3V ~ 18V
- Current - Quiescent (Max):
- 4 µA
- Current - Output High, Low:
- 4.3mA, 24mA
- Input Logic Level - Low:
- 1V ~ 2.5V
- Input Logic Level - High:
- 4V ~ 12.5V
- Max Propagation Delay @ V, Max CL:
- 50ns @ 15V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD4049UBDT FAQ
1.How can I place an order for CD4049UBDT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4049UBDT 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 CD4049UBDT reliable?
The price and inventory of CD4049UBDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4049UBDT is usually 5 days.
3.What payment methods are accepted for CD4049UBDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4049UBDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4049UBDT?
CD4049UBDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4049UBDT 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 CD4049UBDT?
For technical support, including CD4049UBDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4049UBDT requirements.
6.How does Aetrix verify that CD4049UBDT is sourced from the original manufacturer or authorized distributors?
All CD4049UBDT 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 CD4049UBDT meets industry standards.
7.What is the process for return or replacement of CD4049UBDT?
All CD4049UBDT units undergo pre-shipment inspection (PSI). If there is an issue with CD4049UBDT, 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 CD4049UBDT part is unused and in its original packaging.
Return procedure for CD4049UBDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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