SN74HC161DIn StockTexas Instruments
SN74HC161D is a 4-bit synchronous binary counter IC with synchronous clear, load, and count enable inputs. Features RCO output for cascading, 25 MHz max frequency, 50 pF load capacitance, in SOIC-16 package. From $0.454, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC161D Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4540(MOQ 120)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4-bit synchronous binary counter with UP counting direction and RCO (Ripple Carry Output) for easy cascading
- Synchronous clear and load inputs enable precise control without clock glitches
- High-speed HC/UH family logic operating up to 25 MHz at 50 pF load capacitance
- Available in compact SOIC-16 (R-PDSO-G16) package ideal for space-constrained PCB designs
- Compatible with 2V to 6V supply range, meeting broad system voltage requirements
Applications
The SN74HC161D is widely used in digital systems requiring binary counting and sequencing, such as frequency dividers, address counters in memory controllers, and timing circuits. It is commonly found in microprocessor-based systems, programmable logic controllers, and FPGA peripheral designs where modular cascaded counting is needed. Its synchronous load and clear functions make it ideal for applications demanding precise state initialization and glitch-free operation.
Specifications
| YTEOL | 0 |
| Additional Feature | RCO OUTPUT |
| Count Direction | UP |
| Family | HC/UH |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 25000000Hz |
| Max I(ol) | 0.0052A |
| 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) | 0.08mA |
| Prop. Delay@Nom-Sup | 46ns |
| Propagation Delay (tpd) | 255ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| 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 | 29MHz |
| ## SN74HC161D Alternates Showing results | Image |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mexico |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HC161D:
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Frequently Asked Questions
What is the maximum operating frequency of the SN74HC161D?
The SN74HC161D supports a maximum clock frequency of 25 MHz (25,000,000 Hz) at a load capacitance of 50 pF. This makes it suitable for high-speed digital counting applications within HC-family logic systems operating at standard supply voltages.
Can SN74HC161D counters be cascaded for wider counting ranges?
Yes, the SN74HC161D features a Ripple Carry Output (RCO) specifically designed for cascading multiple devices. By connecting the RCO of one counter to the count enable inputs of the next, you can build 8-bit, 12-bit, or larger synchronous binary counters with minimal additional logic.
What package does the SN74HC161D come in, and what are its dimensions?
The SN74HC161D is available in a 16-pin SOIC (Small Outline IC) package, designated as R-PDSO-G16 per JESD-30. This package is a standard surface-mount form factor compatible with automated PCB assembly and is suitable for high-density board layouts.
What are common applications for the SN74HC161D?
The SN74HC161D is commonly used as a frequency divider, address counter, timing generator, and sequence controller in digital systems. Typical applications include memory address generation, microcontroller peripherals, digital clocks, and programmable timer circuits requiring 4-bit or cascaded binary counting.
What is the difference between the synchronous clear and synchronous load functions?
The synchronous clear resets all counter outputs to zero on the next rising clock edge, while the synchronous load transfers the data present on the parallel input pins (A, B, C, D) to the counter outputs on the next clock edge. Both operations are clock-synchronized, preventing glitches that would occur with asynchronous control signals.
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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 |
|---|---|---|
| 120+ | $0.6684 | $80.21 |
| 280+ | $0.6243 | $174.80 |
| 520+ | $0.5693 | $296.04 |
| 1000+ | $0.4811 | $481.10 |
| 4000+ | $0.4540 | $1816.00 |
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