CD74ACT161E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The CD74ACT161E is a synchronous presettable 4-bit binary counter with asynchronous reset, featuring ACT-family logic levels compatible with TTL and CMOS inputs. It operates at supply voltages from 4.5 V to 5.5 V with propagation delays as low as 8 ns. Available from major distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD74ACT161E Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.3881(MOQ 100)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Synchronous presettable 4-bit binary counter with asynchronous reset for flexible counting operations
- ACT-family logic compatible with both TTL and CMOS input levels at 5 V supply
- Fast propagation delay as low as 8 ns enabling high-frequency counting up to 100 MHz
- Terminal count output (TCO) for easy cascading of multiple counter stages
Applications
The CD74ACT161E is well suited for digital frequency dividers, event counters, and address sequencers in embedded systems. Its TTL-compatible ACT logic makes it ideal for interfacing legacy TTL boards with modern CMOS designs. It is also commonly used in programmable timing circuits and state-machine controllers operating from a 5 V rail.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | TCO OUTPUT |
| Count Direction | UP |
| Family | ACT |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 91000000Hz |
| Max I(ol) | 0.024A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 1 |
| 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 |
| Prop. Delay@Nom-Sup | 15ns |
| Propagation Delay (tpd) | 16.5ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 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 |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 80MHz |
| 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 CD74ACT161E:
Binary Counter, ACT Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDIP16
Frequently Asked Questions
What supply voltage range does the CD74ACT161E support, and how does it affect timing?
The CD74ACT161E operates from a 4.5 V to 5.5 V supply. At 5 V with a 50 pF load, propagation delay is typically 8 ns, allowing reliable operation at clock frequencies up to approximately 100 MHz in synchronous counter applications.
How can multiple CD74ACT161E counters be cascaded to build wider counting ranges?
The device provides a Terminal Count Output (TCO) that goes high when all 4 bits reach logic 1, enabling direct ripple-carry cascading. Two CD74ACT161E devices cascaded yield an 8-bit counter covering 0 to 255 counts with no additional glue logic required.
Which PCB package does CD74ACT161E use, and what are its pin dimensions?
CD74ACT161E comes in a 16-pin PDIP (R-PDIP-T16) through-hole package with 2.54 mm lead pitch and a body width of 6.35 mm, making it straightforward to prototype on breadboards or hand-solder on standard 100-mil pitch PCBs.
When is CD74ACT161E a better choice than a CD74HCT161 in a 5 V mixed-signal design?
CD74ACT161E uses ACT logic thresholds optimised for TTL-level inputs (VIL up to 0.8 V, VIH from 2.0 V), whereas HCT parts have similar input levels but slightly slower typical propagation delays near 14 ns at 5 V and 50 pF. Choose ACT when clock speed exceeds 50 MHz or when driving long PCB traces that degrade signal edges.
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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 |
|---|---|---|
| 100+ | $0.5128 | $51.28 |
| 250+ | $0.4435 | $110.88 |
| 500+ | $0.3881 | $194.05 |
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