SN74LS161ADG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74LS161ADG4 is a synchronous 4-bit binary up counter from the LS logic family with parallel load capability and terminal count output. It operates at a maximum clock frequency of 25 MHz with a 15 pF load capacitance. Housed in a 16-pin SOIC package for surface-mount counting, frequency division, and sequencer applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS161ADG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74LS161ADG4?
- Synchronous 4-bit binary UP counter with parallel preset (load) input
- Maximum clock frequency: 25 MHz at nominal LS supply
- Terminal count output (TCO) for easy cascading to wider counters
- 15 pF load capacitance for standard LS bus drive capability
- 16-pin SOIC surface-mount package with 1.27 mm pitch
- LS family logic levels compatible with TTL and 5V CMOS systems
What is SN74LS161ADG4 used for?
SN74LS161ADG4 is used in digital frequency division, address sequencing, and event counting circuits in embedded systems and digital logic boards. Its synchronous load and terminal count output make it straightforward to cascade into 8-bit or wider counters for clock dividers, state machines, and programmable timer designs operating at up to 25 MHz.
What are the specifications of SN74LS161ADG4?
| YTEOL | 0 |
| Additional Feature | TCO OUTPUT |
| Count Direction | UP |
| Family | LS |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 15pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 25000000Hz |
| Max I(ol) | 0.008A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 32mA |
| Prop. Delay@Nom-Sup | 27ns |
| Propagation Delay (tpd) | 27ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 25MHz |
| 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 |
Where can I find the SN74LS161ADG4 datasheet?
SN74LS161ADG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74LS161ADG4?
Compatible alternatives and drop-in replacements for SN74LS161ADG4:
Binary Counter, LS Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, TTL, PDSO16
Binary Counter, LS Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, TTL, PDSO16
Frequently Asked Questions
Where does SN74LS161ADG4 fit in digital logic designs?
Use SN74LS161ADG4 as a 4-bit synchronous binary counter for address sequencing, frequency division, or state machines running up to 25 MHz.
Which package and loading details should be checked?
Confirm the 16-pin SOIC footprint, LS family supply assumptions, and 15 pF load capacitance before replacing a counter on an existing PCB.
How can procurement avoid a wrong substitute?
Require a synchronous 4-bit up counter with parallel load, terminal count output, and compatible 16-pin surface-mount packaging before approving alternates.
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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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