XD74LS161 – Synchronous Counter – Xinluda

The Xinluda XD74LS161 is a synchronous 4-bit presettable binary counter (74LS161 type) in a DIP-16 package, featuring internal carry look-ahead and asynchronous clear for high-speed counting designs.

The XD74LS161 from Xinluda is a synchronous, presettable 4-bit binary counter belonging to the popular 74LS161 low-power Schottky TTL logic family. It provides synchronous counting with internal carry look-ahead, making it well suited to high-speed counting and frequency-division applications where coincident output transitions are required. As a functional equivalent to the industry-standard 74LS161, it serves as a cost-effective, drop-in option for legacy and new digital designs.

In the XD74LS161, all flip-flops are clocked simultaneously so the outputs change in unison under control of the count-enable inputs and internal gating. The device features an asynchronous (master reset) clear: a low level on the clear input forces all four flip-flop outputs low regardless of the clock, load, or enable inputs. Both count-enable inputs (P and T) must be high to count, and the T input is fed forward to enable the ripple-carry output for easy cascading of multiple stages.

Key Features

• Synchronous 4-bit binary counter (74LS161 type), modulo-16
• Fully synchronous operation — all flip-flops clocked simultaneously
• Internal carry look-ahead for high-speed counting designs
• Asynchronous clear (master reset)
• Fully programmable / presettable parallel data inputs
• Ripple-carry output for n-bit cascading
• Low-power Schottky (74LS) TTL logic family
• Recommended supply voltage (Vcc): 4.75 V to 5.25 V
• Operating free-air temperature range: 0°C to 70°C
• 16-pin DIP (DIP-16) package

Applications

• Frequency division and programmable timing circuits
• High-speed digital counters and event counting
• Address and sequence generation in control logic
• Industrial control and instrumentation
• Legacy TTL board repair and equipment maintenance

Why Source XD74LS161 from Pacific Component Xchange

The Xinluda XD74LS161 has limited authorized-distributor availability, which can stall production runs and field repairs. Pacific Component Xchange specializes in sourcing hard-to-find and obsolete logic devices and counter ICs like the XD74LS161. We focus on authenticity, traceable sourcing, and global shipping so engineers and buyers can keep their builds moving. Whether you need a single replacement or volume quantities for a production schedule, request a quote (RFQ) from Pacific Component Xchange and our team will respond with current availability and pricing.