HCC4556BDG STMicroelectronics Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
The HCC4556BDG is a radiation-hardened dual 1-of-4 decoder/demultiplexer with active-low outputs in a ceramic DIP-16 package from STMicroelectronics. It provides 2 independent 2-to-4 line decoding functions for space, military, and high-reliability digital systems.
- Manufacturer
- STMicroelectronics
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- HCC4556BDG 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
- Radiation-hardened dual 2-to-4 line decoder for space and hi-rel applications
- 2 independent decoder sections with active-low (inverted) outputs
- Standard CMOS 4000-series input conditioning for broad logic compatibility
- Ceramic metal-sealed DIP-16 package with hermetic protection
- 16-pin through-hole configuration for reliable board assembly in extreme environments
- YTEOL near end-of-life status requiring proactive procurement planning
Applications
The HCC4556BDG is designed for space satellite systems, military avionics, and defense electronics requiring radiation-hardened CMOS decoding logic in hermetically sealed packages. Its dual 1-of-4 structure is used for chip-select generation, data bus demultiplexing, and address decoding in rad-hard digital subsystems. High-reliability industrial control systems that demand long operational lifetimes in harsh thermal and radiation environments also utilize this device.
Specifications
| Manufacturer Package Code | DIL16 FP |
| YTEOL | 0 |
| Family | 4000/14000/40000 |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-CDIP-T16 |
| Logic IC Type | 2-LINE TO 4-LINE DECODER |
| Number of Functions | 2 |
| Output Polarity | INVERTED |
| Package Body Material | CERAMIC, METAL-SEALED COFIRED |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Supply Voltage-Max (Vsup) | 15V |
| Supply Voltage-Min (Vsup) | 3V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Terminal Form | THROUGH-HOLE |
| Terminal Position | DUAL |
| Total Dose | 100k Rad(Si) V |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | France |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the radiation hardening of HCC4556BDG differ from a standard 4556 CMOS decoder for satellite use?
The HCC4556BDG is specifically radiation-hardened to withstand total ionizing dose and single-event latch-up in space environments, unlike commercial 4556 variants. The ceramic metal-sealed DIP-16 package provides additional protection against outgassing and moisture ingress over satellite mission lifetimes that can exceed 15 years in orbit.
What output polarity does HCC4556BDG provide, and in which circuit topologies is active-low decoding preferred?
HCC4556BDG outputs are active-low (inverted polarity), meaning only the selected output is driven low while others remain high. This suits designs where chip-enable or chip-select inputs are active-low, such as SRAM or EEPROM memory banks in space-grade data recorders, where selecting one of 4 memory devices requires a single low-asserted enable signal.
Does HCC4556BDG's YTEOL status of 0 affect procurement strategy for long-term programs?
A YTEOL value of 0 indicates the HCC4556BDG is at or near end-of-life, which is a critical concern for space and defense programs with 10 to 20 year support horizons. Procurement teams should initiate a last-time-buy evaluation immediately, identify equivalent radiation-hardened alternatives, and execute lifetime buys to avoid mid-program component shortfalls.
How many independent decoding functions does HCC4556BDG provide, and what is the maximum fan-out per output?
The HCC4556BDG contains 2 independent 1-of-4 decoder sections, each accepting a 2-bit binary address and producing 4 active-low decoded outputs, for a total of 8 outputs across the 16-pin DIP package. In the 4000-series CMOS family, output drive capability is typically specified for at least 1 standard CMOS load at operating voltage, with exact current drive levels confirmed in the STMicroelectronics datasheet.
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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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