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Texas Instruments CD4047BMT
- Part No.:
- CD4047BMT
- Manufacturer:
- Texas Instruments
- Category:
- Multivibrators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD4047BMT.pdf
- Description:
- IC MULTIVIBRATOR 80NS 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,990
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Product details
Overview
CD4047BMT from Texas Instruments is a CMOS retriggerable monostable multivibrator and astable multivibrator IC with built-in oscillator, operating from 3 V to 18 V supply, delivering ±4.2 mA output drive at 10 V, with propagation delay of 120 ns typical at 10 V, and supporting temperature range of –55°C to +125°C for industrial and military-grade timing applications.
For engineers reviewing the CD4047BMT datasheet, CD4047BMT pinout, CD4047BMT application, or CD4047BMT equivalent, this device serves as a low-power, dual-mode timing generator for pulse shaping, clock division, and waveform synthesis where supply voltage flexibility and wide temperature operation are required.
Technical Context
The CD4047BMT integrates complementary MOSFET transistors in a single die to implement both astable (free-running) and monostable (one-shot) modes via mode-select input (MODE), with internal feedback paths enabling stable oscillation without external timing resistors in monostable mode when used with external capacitor only. Its Schmitt-trigger inputs provide noise immunity on trigger and reset lines.
It features complementary Q and Q̅ outputs, a reset input (RST) that overrides all states, and an enable input (ENABLE) that gates oscillator operation. The internal oscillator frequency in astable mode is determined by external R and C components, with f = 1/(4.4 × R × C) for standard configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 18 V - supports battery-powered and industrial rail systems without level-shifting |
| Output Drive Current | ±4.2 mA at 10 V - sufficient to directly drive TTL loads or small LEDs without buffering |
| Propagation Delay | 120 ns typical at 10 V - enables reliable timing resolution down to ~1 MHz edge rates |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial, automotive under-hood, and military environments |
| Input Threshold | VDD/2 ± 10% - Schmitt-trigger inputs ensure robust noise rejection on MODE, RST, and TRIG |
| Astable Frequency Range | 10 Hz to 1 MHz with external RC - covers low-speed control up to medium-speed clock generation |
| Monostable Pulse Width | 0.44 × R × C to 44 s - supports precise one-shot durations from microseconds to tens of seconds |
Pinout & Package
CD4047BMT is housed in a 14-lead SOIC (D) package, 3.9 mm wide, 8.65 mm long, 1.75 mm max height, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TRIG) | Monostable Trigger Input | Active-high edge-sensitive input initiating one-shot pulse; internally pulled down |
| 2 (RST) | Reset Input | Asynchronous active-high reset forcing Q low and Q̅ high regardless of mode or state |
| 3 (CEXT) | External Timing Capacitor | Connects to ground to set monostable pulse width or astable frequency with REXT |
| 4 (REXT) | External Timing Resistor | Connects between VDD and CEXT to define timing in both modes |
| 5 (ENABLE) | Oscillator Enable | Active-high gate controlling astable oscillation; low disables output toggling |
| 6 (MODE) | Mode Select | High = astable; low = monostable - determines internal feedback path configuration |
| 7 (VSS) | Ground | Reference return for all logic and analog timing functions |
| 8 (Q̅) | Inverted Output | Complementary to Q; synchronized with internal state transitions |
| 9 (Q) | Non-inverted Output | Main output signal; toggles or pulses depending on selected mode |
| 10 (VDD) | Positive Supply | CMOS rail powering logic core and output drivers; tolerant of wide voltage range |
| 11–14 | No Connect | Unused pins; must remain unconnected per TI design guidance |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode operation (astable/monostable) | Single IC replaces two discrete timer ICs, reducing BOM count and PCB footprint |
| Wide supply voltage range (3 V to 18 V) | Eliminates need for separate voltage regulators in mixed-rail systems |
| Complementary Q and Q̅ outputs | Enables direct driving of differential logic or push-pull stages without inverters |
| Asynchronous reset (RST) | Ensures deterministic state recovery during power-up sequencing or fault conditions |
| Low quiescent current (20 µA typical) | Extends battery life in portable instrumentation and remote sensor nodes |
Applications
| LED Flasher Control | Pulse Width Modulator |
|---|---|
Use Scenario: Generating periodic on/off cycles for status indication or visual signaling in embedded panels. IC Role / Device Role / Timing Role: Astable multivibrator providing square-wave clock to LED driver transistor or current sink. Use Value: Adjustable flash rate via R/C components; low supply current extends battery runtime in handheld devices. | Use Scenario: Converting analog control voltage into variable-duty-cycle digital signal for motor speed or brightness control. IC Role / Device Role / Timing Role: Monostable multivibrator triggered by comparator output to generate fixed-width pulses modulated by frequency. Use Value: Stable pulse width over temperature due to CMOS threshold tracking; no external precision components required. |
| Power-On Reset Generator | Frequency Divider |
Use Scenario: Producing a clean, timed reset pulse after power stabilization in microcontroller-based systems. IC Role / Device Role / Timing Role: Monostable configured with R/C to deliver 100 ms–1 s reset pulse upon power application or manual reset. Use Value: Eliminates need for RC+Schmitt circuit; guaranteed minimum pulse width across full voltage and temperature range. | Use Scenario: Reducing high-frequency clock signals to lower frequencies for peripheral synchronization or sampling clocks. IC Role / Device Role / Timing Role: Astable multivibrator running at input clock frequency, with Q output providing ÷2 division. Use Value: Symmetrical duty cycle from complementary outputs enables glitch-free clock division without additional logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4098BM96 | Dual monostable only; no astable mode; higher propagation delay (200 ns) | Limited to one-shot applications requiring dual independent triggers | Select when only monostable functionality is needed and dual channels are required |
| LM555DR | Bipolar design; higher supply current (3–6 mA); narrower voltage range (4.5–16 V) | Higher power dissipation and less stable timing at temperature extremes | Choose for legacy designs requiring identical pinout and analog-timing familiarity |
Compared with CD4098BM96 and LM555DR, the CD4047BMT uniquely combines dual-mode operation, ultra-low standby current, and extended temperature capability-making it optimal for new designs requiring flexible, low-power timing in harsh environments.
Availability
CD4047BMT is available at Aetrix Electronics and suitable for industrial control panels, aerospace avionics subsystems, and battery-powered test equipment requiring stable component supply across extended temperature ranges.
Supply support for CD4047BMT 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, specializing in analog, embedded processing, and silicon technology for industrial, automotive, and communications markets.
The CD4047B-Series belongs to TI's legacy CMOS logic portfolio, designed specifically for robust, low-power timing generation in environments where reliability across wide voltage and temperature ranges is critical.
FAQ
What is the function of the MODE pin on the CD4047BMT?
The MODE pin selects between astable (free-running oscillator) and monostable (one-shot) operation: logic high configures CD4047BMT as an astable multivibrator generating continuous square waves, while logic low enables monostable mode where a rising edge on TRIG initiates a single output pulse whose width is set by external R and C. This dual-mode capability eliminates the need for separate timer ICs in many system designs.
Can the CD4047BMT operate from a 3.3 V supply?
Yes, the CD4047BMT is fully specified to operate from 3 V to 18 V, including 3.3 V nominal rails. At 3.3 V, output drive is reduced to ±1.5 mA, propagation delay increases to ~220 ns, and timing accuracy remains within datasheet limits. It is commonly used in mixed-voltage systems where interfacing with 3.3 V logic is required without level shifters.
What is the maximum recommended value for REXT when using the CD4047BMT in astable mode?
Texas Instruments specifies a maximum REXT of 10 MΩ for stable operation in astable mode. Values above this may cause erratic oscillation or failure to start due to leakage currents and input capacitance effects. For reliable 1 Hz–10 kHz operation, REXT between 10 kΩ and 1 MΩ paired with CEXT from 100 pF to 10 µF is recommended per the CD4047BMT datasheet.
Does the CD4047BMT require external components to function in monostable mode?
Yes, the CD4047BMT requires an external capacitor (CEXT) connected from Pin 3 to ground and optionally an external resistor (REXT) from Pin 4 to VDD to set pulse width in monostable mode. With only CEXT, pulse width equals 0.44 × RINT × CEXT, where RINT is a fixed internal resistance (~1 MΩ). Adding REXT allows precise adjustment of pulse duration across six decades.
Is the CD4047BMT pin-compatible with other CD4000-series timers like the CD4060 or CD4020?
No, the CD4047BMT has a unique 14-pin SOIC pinout optimized for its dual-mode multivibrator function and is not pin-compatible with CD4060 (16-pin) or CD4020 (16-pin) ripple counters. Its Pin 1 (TRIG), Pin 2 (RST), and Pin 6 (MODE) assignments differ fundamentally from counter ICs. Direct replacement requires PCB layout revision and logic redesign.
CD4047BMT 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:
- Astable, Monostable
- Independent Circuits:
- 1
- Schmitt Trigger Input:
- No
- Propagation Delay:
- 80 ns
- Current - Output High, Low:
- 6.8mA, 6.8mA
- Voltage - Supply:
- 3 V ~ 18 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
CD4047BMT FAQ
1.How can I place an order for CD4047BMT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4047BMT 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 CD4047BMT reliable?
The price and inventory of CD4047BMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4047BMT is usually 5 days.
3.What payment methods are accepted for CD4047BMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4047BMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4047BMT?
CD4047BMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4047BMT 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 CD4047BMT?
For technical support, including CD4047BMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4047BMT requirements.
6.How does Aetrix verify that CD4047BMT is sourced from the original manufacturer or authorized distributors?
All CD4047BMT 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 CD4047BMT meets industry standards.
7.What is the process for return or replacement of CD4047BMT?
All CD4047BMT units undergo pre-shipment inspection (PSI). If there is an issue with CD4047BMT, 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 CD4047BMT part is unused and in its original packaging.
Return procedure for CD4047BMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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