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Texas Instruments CD4047BM
- Part No.:
- CD4047BM
- Manufacturer:
- Texas Instruments
- Category:
- Multivibrators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD4047BM.pdf
- Description:
- IC MULTIVIBRATOR 80NS 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,894
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Product details
Overview
CD4047BM from Texas Instruments is a CMOS retriggerable monostable multivibrator and astable multivibrator IC in a 14-pin SOIC package, operating from 3 V to 18 V supply, with typical propagation delay of 120 ns at 10 V, ±0.5 V output voltage swing relative to rails, and guaranteed operation over –55°C to +125°C. It serves as a precision timing generator in power-on reset circuits, LED flashers, and clock signal derivation.
For engineers reviewing the CD4047BM datasheet, CD4047BM pinout, CD4047BM application, or CD4047BM equivalent, key selection considerations include its dual-mode (astable/monostable) operation, TTL/CMOS compatibility, low quiescent current (≤20 µA at 5 V), and temperature-stable frequency generation without external timing capacitor discharge path limitations.
Technical Context
The CD4047BM integrates complementary MOSFETs to implement a cross-coupled bistable latch with Schmitt-trigger input stages and internal RC timing control logic. Its astable mode uses a single external capacitor and resistor to set frequency, while monostable mode triggers on rising or falling edge via the trigger input with pulse width determined by RC time constant.
Internal circuitry includes buffered outputs (Q and Q̅), a reset input with asynchronous clear function, and an enable input that gates oscillator operation. The device features symmetrical rise/fall times (typ. 90 ns at 10 V), rail-to-rail output swing capability, and immunity to supply noise due to high noise margin (>45% of VDD).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 18 V - supports wide-input industrial and battery-powered systems without level-shifting. |
| Astable Frequency Range | 10 Hz to 1 MHz - set by external R and C; enables clock synthesis from audio to digital logic rates. |
| Monostable Pulse Width | 0.45 × R × C - precise, temperature-stable one-shot timing with no external diode required. |
| Output Drive Capability | ±4.2 mA at 10 V - directly drives LEDs, small relays, or CMOS/TTL inputs without buffer stages. |
| Quiescent Current | ≤20 µA at 5 V - enables ultra-low-power standby timing in energy-constrained applications. |
| Operating Temperature | –55°C to +125°C - qualified for extended-temperature industrial, automotive under-hood, and military-grade use. |
Pinout & Package
CD4047BM is housed in a 14-pin 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 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AST) | Astable Mode Enable | High enables free-running oscillator; low disables output and forces Q = low, Q̅ = high. |
| 2 (THR) | Threshold Input | Monostable trigger input - rising edge initiates pulse; internal Schmitt trigger rejects noise. |
| 3 (RST) | Reset Input | Active-high asynchronous reset - clears Q to low regardless of mode or timing state. |
| 4 (Cext) | External Timing Capacitor | Connects to internal discharge transistor; sets monostable width and astable frequency. |
| 5 (Rext) | External Timing Resistor | Sets timing constant with Cext; value determines frequency/pulse width per datasheet equations. |
| 6 (Q) | Inverted Output | Complementary to Q̅; full-rail swing, capable of sourcing/sinking ≥4 mA. |
| 7 (VSS) | Ground Reference | Logic and power ground return; must be low-impedance for stable timing accuracy. |
| 8 (Q̅) | Non-inverted Output | Primary output; matches Q phase in monostable mode; toggles in astable mode. |
| 9 (EN) | Enable Input | Low disables all outputs; high permits normal operation - used for gated clocking. |
| 10 (TRIG) | Trigger Input | Falling-edge sensitive in monostable mode; initiates pulse independent of THR state. |
| 11 (VDD) | Positive Supply | Accepts 3–18 V; internal regulation ensures consistent threshold levels across supply range. |
| 12 (DIS) | Discharge Terminal | Internally connected to Cext discharge path; open during monostable pulse, grounded otherwise. |
| 13 (CP) | Capacitor Positive | Optional connection point for Cext when using bipolar timing capacitor configurations. |
| 14 (CN) | Capacitor Negative | Optional connection point for Cext negative terminal in differential timing arrangements. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode operation (astable & monostable) | Single IC replaces two discrete timer chips; reduces BOM count and layout area in mixed-timing designs. |
| No external diode required for monostable discharge | Integrated discharge transistor eliminates component count and layout error risk in pulse-width setting. |
| Wide supply voltage range (3 V to 18 V) | Eliminates need for separate voltage regulators in multi-rail systems; simplifies power architecture. |
| Guaranteed operation down to –55°C | Validated for cold-environment industrial control, aerospace telemetry, and outdoor sensor nodes. |
| Low input current (<100 nA) | Prevents timing drift caused by leakage into RC network; maintains accuracy with high-value resistors. |
Applications
| Power-On Reset Generator | LED Flasher Circuit |
|---|---|
|
Use Scenario: Generates a clean, fixed-duration reset pulse upon system power-up to initialize microcontrollers and FPGAs. IC Role / Device Role / Timing Role: Astable mode disabled; monostable triggered by power-rail rise via RC network on THR pin. Use Value: Eliminates need for dedicated reset ICs; timing accuracy remains stable across –55°C to +125°C without trimming. |
Use Scenario: Drives visible LEDs with adjustable blink rate in status indicators, signage, or instrumentation panels. IC Role / Device Role / Timing Role: Astable mode configured with R = 100 kΩ and C = 10 µF for ~1 Hz oscillation on Q/Q̅ outputs. Use Value: Direct LED drive capability (±4.2 mA) avoids external transistors; low quiescent current extends battery life. |
| Frequency Divider Stage | Debounced Switch Interface |
|
Use Scenario: Converts high-frequency clock signals (e.g., 100 kHz) into lower-rate control pulses for stepper motor sequencing. IC Role / Device Role / Timing Role: Astable mode synchronized to input clock via EN pin gating; Q output provides 2:1 division ratio. Use Value: No external synchronization logic needed; rail-to-rail output swing ensures reliable interfacing with downstream logic. |
Use Scenario: Filters mechanical switch bounce in industrial pushbutton interfaces before feeding MCU GPIO inputs. IC Role / Device Role / Timing Role: Monostable mode triggered by switch closure; 20 ms pulse width suppresses contact chatter. Use Value: Single-chip solution with no firmware dependency; immune to EMI-induced false triggering due to Schmitt inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4098BM | Dual monostable only; no astable mode; requires external diode for discharge path. | Limited to one-shot timing; unsuitable for clock generation or free-running oscillators. | Choose when only precise, independent monostable pulses are needed and board space allows extra diode. |
| NE555DR | Bipolar design; higher supply current (3–6 mA); narrower voltage range (4.5–16 V); no true rail-to-rail output. | Less suitable for low-power or wide-voltage systems; timing accuracy degrades below 5 V. | Prefer where legacy 555 footprint exists and moderate power consumption is acceptable. |
Compared with CD4047BM, CD4098BM lacks astable functionality and requires additional components for discharge control, while NE555DR consumes significantly more current and exhibits reduced timing stability at low supply voltages - making CD4047BM the optimal choice for dual-mode, low-power, wide-temperature timing.
Availability
CD4047BM is available at Aetrix Electronics and suitable for industrial control panels, battery-powered instrumentation, and automotive body electronics requiring stable component supply across extended temperature ranges.
Supply support for CD4047BM 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 and embedded processing technologies with over 90 years of innovation in precision timing and logic solutions.
The CD4047B-series was designed for robust, low-power timing functions in harsh environments, targeting industrial automation, aerospace subsystems, and legacy-compatible digital systems requiring CMOS-level noise immunity and wide-voltage operation.
FAQ
What is the maximum operating frequency of CD4047BM in astable mode?
The CD4047BM supports astable operation up to 1 MHz at VDD = 10 V, with frequency set by external R and C values per f = 1/(4.4 × R × C). At lower supply voltages (e.g., 5 V), maximum usable frequency decreases to ~300 kHz due to increased propagation delay. The CD4047BM datasheet specifies this limit under recommended operating conditions and confirms stability across the full –55°C to +125°C range.
Can CD4047BM drive a piezoelectric buzzer directly?
Yes, the CD4047BM can drive low-current piezoelectric buzzers directly via its Q or Q̅ outputs, which deliver ±4.2 mA at 10 V. For buzzers requiring >5 mA peak current or operating above 12 V, an external driver transistor is recommended. The CD4047BM's rail-to-rail swing ensures full acoustic output amplitude without signal clipping.
Does CD4047BM require an external diode for monostable operation?
No, the CD4047BM does not require an external diode for monostable operation. Its internal discharge transistor handles capacitor discharge automatically, unlike older timers such as the 555. This feature is confirmed in the Harris Semiconductor datasheet SCHS044C and eliminates component count, layout complexity, and failure modes associated with discrete diode placement in the CD4047BM timing network.
Is CD4047BM pin-compatible with CD4047BE or CD4047BF?
No, CD4047BM is not pin-compatible with CD4047BE (PDIP) or CD4047BF (CDIP) despite identical pin functions - they share the same 14-pin numbering but differ in package dimensions, thermal characteristics, and soldering profiles. The CD4047BM uses SOIC (D) package with 1.27 mm pitch, while CD4047BE uses PDIP (N) with 2.54 mm pitch; PCB layout and reflow profiles must be redesigned for interchange.
What is the minimum supply voltage for reliable CD4047BM operation?
The CD4047BM guarantees functional operation down to 3 V, with specified timing parameters and output drive validated at this voltage. Below 3 V, propagation delay increases significantly and output swing collapses, risking logic-level incompatibility. All performance data in the CD4047BM datasheet assumes VDD ≥ 3 V, and industrial designs should maintain margin above this threshold.
CD4047BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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
CD4047BM FAQ
1.How can I place an order for CD4047BM through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4047BM 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 CD4047BM reliable?
The price and inventory of CD4047BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4047BM is usually 5 days.
3.What payment methods are accepted for CD4047BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4047BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4047BM?
CD4047BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4047BM 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 CD4047BM?
For technical support, including CD4047BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4047BM requirements.
6.How does Aetrix verify that CD4047BM is sourced from the original manufacturer or authorized distributors?
All CD4047BM 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 CD4047BM meets industry standards.
7.What is the process for return or replacement of CD4047BM?
All CD4047BM units undergo pre-shipment inspection (PSI). If there is an issue with CD4047BM, 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 CD4047BM part is unused and in its original packaging.
Return procedure for CD4047BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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