CD74HC4538E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
CD74HC4538E is a dual retriggerable precision monostable multivibrator in the HC CMOS family, offering 2 independent one-shot channels in a 16-pin DIP package operating at 2 V to 6 V.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD74HC4538E Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2526(MOQ 1)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual independent retriggerable monostable channels allow overlapping pulse generation without resetting the output prematurely
- Precision external RC network sets pulse width from nanoseconds to seconds with high timing accuracy
- HC CMOS family provides 50 pF load drive at 2 V to 6 V supply with low quiescent current for power-sensitive systems
Applications
CD74HC4538E is used in embedded systems and industrial controllers to generate precise timing pulses for debouncing switch inputs, creating power-on reset delays, and producing missing-pulse detector windows. Each of the 2 monostable channels can be independently triggered from rising or falling edges, making it suitable for pulse-stretching and timeout generation in motor control sequencers. Its 16-pin DIP form factor simplifies through-hole prototyping and repair of legacy relay logic and PLC I/O interface boards.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Family | HC/UH |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | MONOSTABLE MULTIVIBRATOR |
| Max I(ol) | 0.0052A |
| Number of Bits | 2 |
| Number of Data/Clock Inputs | 2 |
| Number of Functions | 2 |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.08mA |
| Propagation Delay (tpd) | 375ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 4.5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia, Mexico |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for CD74HC4538E:
Frequently Asked Questions
How is the output pulse width set on CD74HC4538E and what component values are typically used?
The output pulse width on CD74HC4538E is determined by an external resistor and capacitor connected to the REXT and CEXT pins, following the relationship tw = 0.7 × R × C. A 100 kΩ resistor and 100 nF capacitor produce approximately 7 ms pulse width. Resistor values from 5 kΩ to 100 MΩ and capacitor values from 0 pF to several hundred microfarads allow pulse widths spanning nanoseconds to tens of seconds.
What advantage does the retriggerable characteristic of CD74HC4538E offer in a watchdog or missing-pulse detector circuit?
Because CD74HC4538E is retriggerable, each new input pulse before the timing period expires restarts the 16-pin device's output high interval without glitching. In a missing-pulse detector running at 50 Hz repetition, the output stays high as long as input pulses arrive within the set window of, for example, 25 ms. If a pulse is missed, the output transitions after the RC-programmed timeout, signaling a fault to a microcontroller interrupt pin.
When is CD74HC4538E a better choice than a microcontroller timer peripheral for pulse generation?
CD74HC4538E is preferred when a hardware one-shot is needed independent of software execution, such as generating a guaranteed 5 ms power-on reset pulse that must assert before the CPU clock starts. It draws only microamperes in standby at 3.3 V or 5 V supply, whereas keeping a microcontroller active solely for timing wastes milliamps continuously. For 2-channel needs with through-hole 16-pin DIP assembly, the CD74HC4538E is also significantly cheaper than adding an MCU.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.7196 | $0.72 |
| 25+ | $0.2879 | $7.20 |
| 100000+ | $0.2526 | $25260.00 |
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