SNJ54HC42J Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
Texas Instruments SNJ54HC42J is a military-grade HC-family 4-to-10 BCD decimal decoder/driver with 10 active-low outputs, 50 pF load capacitance, and 5.2 mA output sink current in a 16-pin ceramic DIP package rated for the full military temperature range. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SNJ54HC42J 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
- HC/UH family 4-to-10 BCD decimal decoder with 10 active-low outputs and 5.2 mA sink current per output, enabling direct LED or relay driving without buffer stages
- Military-grade 54HC logic family with full -55°C to +125°C temperature rating in a hermetically sealed ceramic DIP-16 package for defense and aerospace applications
- 50 pF load capacitance specification supports reliable operation on backplane buses in high-capacitance digital environments without signal degradation
Applications
The SNJ54HC42J is used in military and aerospace digital systems for BCD-to-decimal decoding in address selection, keyboard scanning, and display multiplexing circuits that must operate reliably from -55°C to +125°C. Its 10 active-low outputs with 5.2 mA sink capability allow direct driving of discrete indicator LEDs or opto-isolators on avionics control panels and ruggedized instrumentation equipment.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Family | HC/UH |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-GDIP-T16 |
| JESD-609 Code | e0 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | DECIMAL DECODER/DRIVER |
| Max I(ol) | 0.0052A |
| Number of Bits | 10 |
| Number of Functions | 1 |
| Output Polarity | INVERTED |
| 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) | 0.16mA |
| Prop. Delay@Nom-Sup | 38ns |
| Propagation Delay (tpd) | 225ns |
| Qualification Status | Not Qualified |
| Screening Level | MIL-PRF-38535 |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| 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
How many outputs does the SNJ54HC42J provide, and what logic level drives each output active?
The SNJ54HC42J provides 10 active-low outputs, one for each decimal digit 0 through 9. When a valid 4-bit BCD input code is applied, exactly one output goes low while the remaining 9 outputs stay high. Each output can sink up to 5.2 mA, allowing direct connection to indicator LEDs with a current-limiting resistor of approximately 470 ohms at 3.3 V supply.
What operating temperature range does the SNJ54HC42J cover, and which environments require this rating?
The SNJ54HC42J covers the full military temperature range of -55°C to +125°C, required for aerospace avionics, military ground vehicles, satellite systems, and harsh-environment industrial controllers where commercial parts rated only to 70°C would fail. The hermetic ceramic DIP-16 package also prevents moisture-induced failure in high-humidity or vacuum-cycling environments such as aircraft unpressurized bays.
How does the SNJ54HC42J handle invalid BCD input codes above binary 1001 (decimal 9)?
When a BCD input code greater than 9 is applied to the SNJ54HC42J (inputs A3-A0 encoding values 10 through 15), all 10 outputs remain high (inactive). This built-in invalid-code rejection prevents false activation of any output line, which is critical in fault-tolerant avionics decoding circuits where spurious output transitions could trigger unintended actuator or display responses.
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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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