SN74F161ANS Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74F161ANS is a 4-bit synchronous binary counter with internal look-ahead circuitry, synchronous clear, and parallel load in a 16-pin SOP package. Operates on a 5 V supply for high-speed digital counting applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SN74F161ANS Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74F161ANS?
- Internal look-ahead carry circuitry enabling fast cascaded counting chains without external carry propagation delays
- Synchronous clear and parallel load inputs for precise counter initialization and preset operations
- Fast F-series TTL technology with typical propagation delay under 5 ns for high-speed digital logic
- 16-pin SOP package compatible with standard 5 V TTL and LSTTL digital systems
What is SN74F161ANS used for?
The SN74F161ANS is used in address generation circuits, frequency dividers, and state machine sequencers in digital logic systems requiring fast 4-bit binary counting. Its look-ahead carry output enables seamless cascading of multiple 74F161 devices to build 8-bit, 16-bit, or wider counters with minimal carry delay. Engineers also deploy it in timing circuits, clock dividers, and synchronous state machines within FPGA prototyping boards and embedded digital control designs.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the SN74F161ANS datasheet?
SN74F161ANS Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74F161ANS?
Compatible alternatives and drop-in replacements for SN74F161ANS:
Binary Counter, F/FAST Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, TTL, PDSO16
Binary Counter, F/FAST Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, TTL, PDSO16
Frequently Asked Questions
How does the SN74F161ANS look-ahead carry feature improve counter chain performance versus ripple carry designs?
The SN74F161ANS generates its carry output using internal look-ahead logic rather than waiting for ripple propagation through all 4 flip-flops. This reduces the carry propagation delay to under 5 ns, allowing designers to cascade multiple 74F161 devices into 8-bit or 16-bit counters operating at clock frequencies above 100 MHz without timing violations.
For a 5 V digital system requiring a modulo-12 counter, how can SN74F161ANS be configured using its parallel load input?
To implement a modulo-12 counter with SN74F161ANS, connect the terminal count output through a gate to the parallel load enable input, and preset the data inputs to 4 (binary 0100). When the counter reaches 15, the load signal resets it to 4, producing a 12-count sequence with 5 V logic levels and deterministic synchronous operation.
Can SN74F161ANS operate in mixed 5 V TTL and CMOS systems, and what drive capability does it provide?
The SN74F161ANS is an F-series TTL device operating at 5 V supply with output drive capability of 20 mA sink and 1 mA source, compatible with standard 74LS, 74ALS, and 5 V CMOS inputs. It is not directly compatible with 3.3 V CMOS systems without level translation, but interfaces cleanly with 74HC and HCT families at 5 V.
In a PCB with limited space, what footprint does the SN74F161ANS 16-pin SOP package provide?
The SN74F161ANS 16-pin SOP package occupies approximately 10 mm x 6 mm with 1.27 mm lead pitch, fitting on standard 0.05-inch grid footprints. This small-outline format is significantly more compact than the 16-pin DIP equivalent at 19 mm x 6 mm, making the SN74F161ANS suitable for dense digital logic boards where space is limited.
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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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