HCC4515BDT STMicroelectronics Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
The HCC4515BDT is a radiation-hardened 4-bit latch and 4-to-16 line decoder with active-low outputs from STMicroelectronics. It operates from 3 V to 18 V supply and is housed in a ceramic DIP package for high-reliability aerospace and defense applications. The integrated latch enables address hold during decoding in radiation-exposed environments.
- Manufacturer
- STMicroelectronics
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 24
- Lifecycle
- ACTIVE
- Datasheet
- HCC4515BDT Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Radiation-hardened 4-bit latch and 4-to-16 line decoder in a single IC for space and defense systems
- Wide supply voltage range of 3 V to 18 V supporting both low-voltage logic and legacy high-voltage CMOS systems
- Active-low decoded outputs enabling direct connection to chip-select or enable inputs of memory and peripheral ICs
- Ceramic DIP package providing hermetic sealing and high-temperature operation above 125°C for mil-spec environments
- Integrated address latch eliminates external latch IC in multiplexed bus decoders for satellite or avionics designs
Applications
The HCC4515BDT is used in space satellite payload electronics, avionics computers, and nuclear facility control systems where ionizing radiation would cause single-event upsets in commercial CMOS decoders. Its 4-to-16 decoding with on-chip latching simplifies address demultiplexing in memory bus expansions for radiation-tolerant embedded computers. The ceramic hermetic package enables reliable operation across the full military temperature range from -55°C to +125°C in harsh environment deployments.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
For a satellite memory bus, how does HCC4515BDT's integrated latch simplify the decoder circuit compared to external solutions?
HCC4515BDT combines a 4-bit address latch with the 4-to-16 decoder in a single ceramic DIP IC, eliminating the need for a separate 74HC373 or equivalent latch chip on the board. This integration reduces component count by at least 1 IC, saves PCB area, and decreases the number of radiation-sensitive nodes by consolidating two critical functions into one rad-hard device rated for space environments above 10 kRad total ionizing dose.
What supply voltage range does HCC4515BDT support and how does this affect compatibility with different logic families?
HCC4515BDT operates from 3 V to 18 V, covering 3.3 V CMOS logic at the low end and legacy 12 V or 15 V CMOS systems at the high end. At 5 V, its outputs are TTL-compatible, enabling direct interfacing with 74LS or 74HC peripherals. At 12 V to 15 V, the higher swing can drive analog multiplexers and relay drivers directly, eliminating level-shift circuitry in high-voltage control panels.
How does the active-low output configuration of HCC4515BDT connect to SRAM chip-select inputs in memory expansion designs?
SRAM devices such as 62256 or IS61C256 have active-low chip-select (CS) inputs that assert the memory when pulled below 0.8 V. HCC4515BDT's 16 active-low decoded outputs connect directly to these CS pins without inverters, selecting one 64 KB SRAM bank per decoded address while holding the other 15 banks in deselected (high) state, implementing a 1 MB linear memory map with a single decoder IC.
What temperature range does HCC4515BDT's ceramic DIP package support for aerospace deployments?
The hermetic ceramic DIP package allows HCC4515BDT to operate reliably from -55°C to +125°C, meeting MIL-STD-883 Class B requirements for military and aerospace equipment. The ceramic body provides moisture resistance superior to plastic SOIC or DIP packages, preventing moisture-induced failures during thermal cycling between the cold vacuum of orbit (-40°C to -60°C) and internal electronics bay temperatures exceeding 100°C.
When would HCC4515BDT be specified over a commercial 74HC154 decoder in a power plant control system?
In nuclear power plant control rooms exposed to neutron and gamma radiation above 1 kRad/year, commercial 74HC154 CMOS may suffer parametric drift or latch-up within months of deployment. HCC4515BDT's radiation-hardened process tolerates total ionizing dose above 10 kRad without latch-up, maintaining guaranteed output switching thresholds across the full -55°C to +125°C temperature range required for IEC 61513 nuclear safety system qualification.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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