SNJ54AS161J Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
The SNJ54AS161J is a 4-bit synchronous binary up-counter from Texas Instruments in the Advanced Schottky (AS) logic family, housed in a 16-pin ceramic DIP package. It features parallel load, synchronous reset, terminal count output (TCO), and 50 pF load capacitance, suitable for high-speed counting and frequency division. Designed for military, aerospace, and high-reliability digital systems requiring robust synchronous counting with look-ahead carry.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SNJ54AS161J Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4-bit synchronous binary up-counter with parallel load for flexible initialization
- Terminal Count Output (TCO) enables cascading multiple counters for extended counting ranges
- Advanced Schottky (AS) family provides fast propagation delay for high-speed applications
- 50 pF load capacitance with synchronous reset and preset for precise timing control
- 16-pin ceramic DIP package (R-GDIP-T16) for military and high-reliability environments
- Pb-free and JESD-609 e0 compliant for qualifying in hermetic ceramic assemblies
Applications
The SNJ54AS161J is used in military and aerospace digital control systems, high-speed frequency dividers, and programmable timing circuits where reliable synchronous counting with carry propagation is required. Its TCO output enables multi-stage cascading for building wider binary counters in rugged embedded system designs operating in harsh environments.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | TCO OUTPUT |
| Count Direction | UP |
| Family | AS |
| JESD-30 Code | R-GDIP-T16 |
| JESD-609 Code | e0 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 65000000Hz |
| Max I(ol) | 0.02A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 1 |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 53mA |
| Prop. Delay@Nom-Sup | 16.5ns |
| Propagation Delay (tpd) | 14ns |
| Qualification Status | Not Qualified |
| Screening Level | MIL-PRF-38535 |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | TTL |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 65MHz |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the SNJ54AS161J and what logic family does it belong to?
The SNJ54AS161J is a 4-bit synchronous binary up-counter from Texas Instruments, part of the Advanced Schottky (AS) logic family. It is housed in a 16-pin ceramic dual-in-line package and is designed for high-speed digital counting applications. The AS family offers improved speed and lower power consumption compared to standard Schottky TTL logic.
What are the key functional features of the SNJ54AS161J?
The SNJ54AS161J provides synchronous binary counting with parallel load capability, synchronous reset, and a terminal count output (TCO) for cascading multiple counters. It supports look-ahead carry logic for high-speed cascaded counter configurations. The device counts upward only and is rated for a 50 pF load capacitance.
What applications and environments is the SNJ54AS161J designed for?
The SNJ54AS161J is specifically designed for military, aerospace, and high-reliability industrial applications requiring operation across extreme temperature ranges. Its ceramic DIP package provides superior hermeticity and thermal performance compared to plastic packages. It is suitable for frequency division, address generation, event counting, and timing control in rugged digital systems.
How does the terminal count output (TCO) enable counter cascading in the SNJ54AS161J?
The terminal count output (TCO) goes high when the counter reaches its maximum count (15 in 4-bit binary), allowing it to be connected to the enable inputs of subsequent SNJ54AS161J devices. This enables straightforward construction of wider counters such as 8-bit or 16-bit configurations without additional external logic. The synchronous nature of the TCO ensures minimal propagation delay in cascaded arrangements.
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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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