CD74AC161E Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The CD74AC161E is a synchronous presettable 4-bit binary counter with asynchronous reset in AC-family CMOS logic, operating from 3 V to 5.5 V with propagation delays as low as 5.5 ns. It includes a Terminal Count Output for cascading multiple stages and comes in a 16-pin PDIP package for through-hole applications. Available from major distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD74AC161E Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.6986(MOQ 266)
- 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 state initialization
- AC-family CMOS achieving propagation delays as low as 5.5 ns at 5 V, faster than HC or ACT equivalents
- Terminal Count Output (TCO) enabling direct multi-stage cascading without external carry logic
- 16-pin PDIP through-hole package ideal for prototyping, breadboard development, and repair of legacy boards
Applications
The CD74AC161E is suited to digital frequency dividers, address counters, and state-machine sequencers in 5 V embedded and industrial systems where high-speed counting above 100 MHz is required. Its AC-family logic delivers significantly lower propagation delay than HC or HCT alternatives, making it preferable in timing-critical designs with short clock periods. It is commonly found in legacy board repairs, educational lab kits, and low-volume industrial controllers where through-hole assembly is preferred.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | TCO OUTPUT |
| Count Direction | UP |
| Family | AC |
| 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 | 64000000Hz |
| Max I(ol) | 0.024A |
| Mode of Operation | SYNCHRONOUS |
| 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) | 207ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1.5V |
| 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 | 90MHz |
| 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 CD74AC161E:
Binary Counter, AC Series, Synchronous, Positive Edge Triggered, Up Direction, CMOS, PDIP16
Binary Counter, AC Series, Synchronous, Positive Edge Triggered, Up Direction, CMOS, PDIP16
Frequently Asked Questions
How does CD74AC161E compare to CD74ACT161E in a 5 V system clocked at 100 MHz?
CD74AC161E uses AC-family pure CMOS input thresholds (VIH = 3.15 V at 5 V supply) and achieves propagation delays as low as 5.5 ns, while CD74ACT161E has TTL-compatible thresholds (VIH = 2.0 V) and typical delays near 8 ns. At 100 MHz (10 ns clock period) the AC-family margin of approximately 4.5 ns is preferable, but ACT is better for boards with TTL-level driving sources.
How can two CD74AC161E devices be cascaded to build an 8-bit synchronous binary counter?
Connect the Terminal Count Output (TCO) of the first CD74AC161E to the Count Enable inputs of the second device. When the lower 4 bits overflow at count 15, TCO goes high for one clock cycle, enabling the upper nibble to increment by 1, creating a fully synchronous 8-bit counter covering 0 to 255 with no extra delay between stages.
What is the typical setup time for CD74AC161E data inputs before the active clock edge?
CD74AC161E requires a minimum data setup time of approximately 3 ns before the rising clock edge at 5 V supply and 50 pF load. This tight setup time allows the device to be clocked at frequencies up to 150 MHz in pipeline architectures where data changes close to the clock edge, with a hold time of approximately 1 ns.
For a repair application on a legacy 5 V PCB, is the 16-pin PDIP package of CD74AC161E easy to source and hand-solder?
CD74AC161E in the 16-pin PDIP (R-PDIP-T16) package uses 2.54 mm lead pitch and standard through-hole pads, making it readily available from distributors in single-unit quantities. Hand-soldering requires only a standard 30 W iron with a fine tip; the 2.54 mm pitch accommodates even novice technicians and fits directly into 600-mil wide DIP sockets.
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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 |
|---|---|---|
| 266+ | $1.1300 | $300.58 |
| 500+ | $0.7960 | $398.00 |
| 1000+ | $0.7700 | $770.00 |
| 3000+ | $0.7650 | $2295.00 |
| 100000+ | $0.6986 | $69860.00 |
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