M74HC4520B1R STMicroelectronics Integrated Circuit (Dual-In-Line Packages) In Stock
The M74HC4520B1R is a dual 4-bit binary up-counter in the HC CMOS logic family, featuring gated clock inputs and Schmitt trigger clock inputs for noise-immune counting. It operates from 2 V to 6 V in a 16-pin DIP package for digital counting and timing circuits.
- Manufacturer
- STMicroelectronics
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- M74HC4520B1R 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 4-bit binary up-counter with independent enable and clock inputs
- Schmitt trigger on clock input for reliable counting in noisy environments
- Gated clock architecture supports synchronous enable/disable without glitches
- HC CMOS family operating from 2 V to 6 V supply
- 50 pF load capacitance specification for standard logic bus compatibility
- 16-pin DIP package for breadboard prototyping and through-hole assembly
Applications
The M74HC4520B1R is used in frequency division, event counting, and digital timing circuits in industrial equipment, educational electronics, and embedded control systems. Its dual independent counter structure and Schmitt trigger inputs make it well suited for debounce-free button event counters, clock dividers, and sequencing circuits in 5 V logic designs.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | GATED CLOCK; SCHMITT TRIGGER ON CLOCK INPUT |
| Count Direction | UP |
| Family | HC/UH |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | NO |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 20000000Hz |
| Max I(ol) | 0.004A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 2 |
| 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) | 50mA |
| Prop. Delay@Nom-Sup | 48ns |
| Propagation Delay (tpd) | 240ns |
| 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 |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 24MHz |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for M74HC4520B1R:
Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDIP16
Seven Segment Decoder/Driver, HC/UH Series, Configurable Output, CMOS, PDIP16
Frequently Asked Questions
How does the Schmitt trigger clock input on M74HC4520B1R improve counting reliability in noisy industrial environments?
The Schmitt trigger clock input provides hysteresis, typically around 0.9 V at 5 V supply, so slow-rising or noisy clock signals do not cause false counts, making the M74HC4520B1R reliable in motor drive and relay-switching environments.
Can the two 4-bit counters in M74HC4520B1R be cascaded to form an 8-bit counter?
Yes. The carry output of the first 4-bit counter can drive the clock input of the second counter on the same device, creating an 8-bit binary counter that counts up to 255 pulses before overflowing.
Is M74HC4520B1R in a through-hole DIP package suitable for prototype testing before migrating to an SMT design?
The 16-pin DIP package allows direct breadboard insertion for rapid prototyping and functional verification. Designers can later migrate to the SOIC or TSSOP SMT variants of the HC4520 family without changing logic design.
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