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Texas Instruments SN74LS161ANSR — Analog & Data Acquisition
Texas Instruments

SN74LS161ANSR 74LS 4-Bit Binary Counter, 25 MHz, 16-SOIC

MPNSN74LS161ANSR
End of Life

Texas Instruments 74LS series SN74LS161ANSR, synchronous 4-bit binary counter, positive-edge triggered, asynchronous reset, 25 MHz count rate, 4.75 V to 5.25 V supply, 0°C to 70°C, 16-SOIC surface-mount package.

$0.99Ref. price · indicative, final on quote
SN74LS161ANSR datasheet
Packaging16-SOIC (0.209", 5.30mm Width)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

SN74LS161ANSR Technical Specifications
ParameterValue
Series74LS
Logic typeBinary Counter
Trigger typePositive Edge
Mounting typeSurface Mount
Voltage4.75 V ~ 5.25 V
Operating temperature0°C ~ 70°C
ResetAsynchronous
TimingSynchronous
PackageTape & Reel (TR); Cut Tape (CT)
DirectionUp
Count rate25 MHz
Case16-SOIC (0.209\", 5.30mm Width)
Number of elements1
Number of bits per element4

Product details

Synchronous 4-bit binary counter with asynchronous reset

The Texas Instruments SN74LS161ANSR is a 74LS-series synchronous 4-bit binary counter that increments on the positive edge of the clock. It includes an asynchronous reset (active low) that clears the outputs independently of the clock. The 25 MHz maximum count rate sets the timing budget for the system bus or sensor edge rate.

It is not rated for automotive under-hood, outdoor telecom cabinets, or industrial motor drives where ambient temperatures exceed 70°C or drop below freezing. The 16-SO supplier device package matches standard SOIC-16 land patterns.

Frequently asked questions

What is the difference between SN74LS161AN and SN74LS161ANSR?

The SN74LS161AN is the through-hole DIP version, while the SN74LS161ANSR is the surface-mount 16-SOIC variant. The package suffix 'SR' indicates the SOIC reeled format.

Can SN74LS161ANSR be used as a replacement for 74LS161?

Yes, the SN74LS161ANSR is a direct functional replacement for the generic 74LS161 — same synchronous 4-bit binary counter with asynchronous reset, same 25 MHz count rate, same 5 V supply. The 'SN' prefix indicates Texas Instruments manufacturing; the 'SR' suffix specifies the 16-SOIC surface-mount package. If your existing 74LS161 is in a DIP package, the footprint differs.