CD74HC4538PWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The CD74HC4538PWG4 is a dual retriggerable precision monostable multivibrator IC from Texas Instruments in the high-speed CMOS HC logic family. It features complementary outputs, 2 clock inputs per channel, and a 16-pin TSSOP package. Available lead-free in tube format for global distribution.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HC4538PWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual retriggerable monostable multivibrator with independent timing for each channel, enabling precise pulse generation
- Complementary Q and Q-bar outputs per channel for maximum design flexibility in timing and sequencing circuits
- High-speed CMOS (HC) logic family with 2V to 6V supply range, offering low power and wide voltage compatibility
- Compact 16-pin TSSOP package at 0.25-inch body width for space-efficient surface-mount PCB designs
Applications
The CD74HC4538PWG4 is used in digital timing circuits, pulse stretching, and debouncing applications where precise controllable pulse widths are required. It is commonly applied in industrial automation, microcontroller peripheral interfaces, and sequential logic circuits where a clean, defined output pulse must be generated from an edge trigger. The dual-channel architecture also makes it suitable for two-phase timing generation and clock conditioning in embedded systems.
Specifications
| YTEOL | 0 |
| Family | HC/UH |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Logic IC Type | MONOSTABLE MULTIVIBRATOR |
| Number of Data/Clock Inputs | 2 |
| Number of Functions | 2 |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| 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 | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for CD74HC4538PWG4:
Frequently Asked Questions
What is the CD74HC4538PWG4 and what does it do?
The CD74HC4538PWG4 is a dual retriggerable precision monostable multivibrator from Texas Instruments. When triggered by a rising or falling edge, it generates a single output pulse whose duration is set by an external RC network. The retriggerable feature allows the output pulse to be extended if a new trigger arrives before the current pulse expires, making it useful for timing and pulse shaping applications.
What are the key specifications of the CD74HC4538PWG4?
The CD74HC4538PWG4 is part of the HC/UH logic family, operating from 2V to 6V supply. It features two independent monostable multivibrator channels, each with 2 clock inputs and complementary Q and Q-bar outputs. The device is packaged in a 16-pin TSSOP with 0.25-inch body width (JESD-30 code R-PDSO-G16), is RoHS-compliant with JESD-609 e4 rating, and uses a plastic/epoxy body.
How is the output pulse width set for the CD74HC4538PWG4?
The output pulse width of the CD74HC4538PWG4 is determined by an external resistor and capacitor connected to the Rext and Cext pins of each channel. The pulse duration is approximately equal to 0.7 x R x C. By selecting appropriate R and C values, users can set pulse widths from nanoseconds to seconds. Each channel has its own independent RC timing network for separate pulse control.
What applications is the CD74HC4538PWG4 designed for?
The CD74HC4538PWG4 is designed for use in pulse generation, signal debouncing, pulse stretching, and one-shot timing applications in digital logic systems. Common applications include microcontroller reset circuits, edge-triggered delay circuits, industrial control sequencing, and clock pulse conditioning. The dual-channel design allows simultaneous independent timing on two signal paths within the same IC.
What is the difference between the CD74HC4538PWG4 and similar monostable multivibrators?
The CD74HC4538PWG4 belongs to the HC CMOS family, which offers lower power consumption and broader supply voltage range (2V to 6V) compared to TTL-based monostables like the 74LS123. Compared to the CD74HCT4538, the HC version is CMOS-input-only while the HCT version has TTL-compatible inputs. The retriggerable feature distinguishes it from non-retriggerable monostables, allowing pulse extension on repeated triggers.
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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.
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