SMJ64C16S-55JDM Legacy Hermetic 16K×8 CMOS Static RAM (SRAM) Overview
The SMJ64C16S-55JDM from Texas Instruments is a high-reliability 16K×8 static random-access memory (SRAM) engineered for legacy industrial, aerospace, and defense systems. Part of TI’s trusted portfolio of hermetic memory components, it provides fast temporary data storage with no power refresh needed—ideal for applications where environmental resilience and legacy compatibility are non-negotiable. Its J-lead DIP (JDM-24) package, 55ns access time, and wide temperature range ensure seamless integration with older electronics while enduring harsh conditions like high heat or corrosion. IC-fabrikant biedt deze geheugencomponent van industriële kwaliteit aan als onderdeel van zijn portfolio van vertrouwde Texas Instruments halfgeleiders.
Technical Parameters for SMJ64C16S-55JDM Industrial SRAM
| Parameter | Waarde | Eenheid |
|---|---|---|
| Functie | 16K×8 statisch willekeurig toegankelijk geheugen (SRAM) | |
| Geheugenconfiguratie | 16,384 × 8 | Bits (128 Kbits / 16 Kbytes totaal) |
| Toegangstijd (Max) | 55 | ns (bij 5V, 25°C) |
| Bereik voedingsspanning | 4,5 tot 5,5 | V (enkele voeding, CMOS-compatibel) |
| Ruststroomdissipatie (typisch) | 85 | mW (bij 5V, onbelast) |
| Type verpakking | JDM-24 (J-Lead Dual In-Line Package, 24-pins, hermetisch keramisch) | |
| Bedrijfstemperatuurbereik | -55 tot +125 | °C (industriële/militaire kwaliteit) |
Belangrijkste functionele kenmerken
| Kenmerk | Specificatie |
|---|---|
| Type interface | 8-bits parallel (CMOS-compatibele adres-/data-/besturingspennen) |
| Compatibiliteit logicafamilie | TI 74HC/74HCT CMOS, 54LS TTL (ondersteuning voor mixed-signal legacy systemen) |
| Geluidsmarge (min) | 0,4V (laag niveau); 0,5V (hoog niveau) (industriële stabiliteit) |
| Uitgangsstroom | -8mA (sink); +4mA (source) (typisch, CMOS-conform) |
| Betrouwbaarheidsnormen | Voldoet aan MIL-STD-883 (hermetisch, temperatuurbestendig, ESD-bescherming) |
Voordelen ten opzichte van alternatieve legacygeheugenoplossingen
The SMJ64C16S-55JDM outperforms generic SRAMs and plastic-packaged alternatives, starting with its hermetic JDM-24 package. Unlike plastic DIPs (which degrade in 2–3 years due to moisture or corrosion), its ceramic enclosure and vacuum seal ensure 10+ years of reliability—critical for systems where replacement is costly or dangerous. “We replaced generic plastic SRAMs with this component in our factory PLCs, and unplanned downtime from memory failures dropped by 80%,” confirms a senior engineer at a leading manufacturing firm.
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Its 55ns access time balances speed and efficiency for mid-speed legacy systems (e.g., 10–20MHz controllers). Slower 70ns SRAMs cause data lag, leading to unsynchronized machine control in production lines, while faster 40ns SRAMs waste power—unnecessary for non-high-speed applications. As a CMOS SRAM, it consumes 60% less power than TTL alternatives (85mW vs. 210mW), extending battery life in portable test tools by 25%.
The JDM-24’s J-lead design creates stronger solder joints than standard through-hole pins, reducing vibration-induced failures in automotive or aerospace systems. Unlike modern surface-mount SRAMs, it fits legacy PCBs designed for J-lead packages—avoiding costly redesigns or adapter boards that add size and complexity. Its -55°C to +125°C temperature range also outperforms commercial-grade SRAMs (limited to 0°C–70°C), ensuring performance in freezing warehouse sensors or hot desert-based industrial equipment.
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Typical Applications of SMJ64C16S-55JDM
The SMJ64C16S-55JDM excels in legacy and mission-critical systems where ruggedness, speed, and compatibility are non-negotiable. Key use cases include:
- Lucht- en ruimtevaart en defensie (gegevensbuffers voor vliegtuigelektronica, geheugen voor raketgeleidingssystemen, loggers voor satellietgrondstations)
- Industrial Automation (legacy PLCs, factory machine data loggers, high-temperature process control systems)
- Testen en meten (robuuste signaalgeneratoren, testapparatuur voor omgevingsbelasting, verouderd oscilloscoopgeheugen)
- Energy and Power (oil/gas well monitoring controllers, high-voltage substation data processors, wind turbine sensor memory)
- Beveiliging en bewaking (sensorgegevensbuffers voor militaire perimeters, oude opnamemodules voor buitencamera's)
Texas Instruments' expertise in hermetisch CMOS-geheugen
As a Texas Instruments product, the SMJ64C16S-55JDM leverages TI’s 70+ years of leadership in industrial and military-grade semiconductors. TI’s hermetic CMOS SRAMs undergo rigorous testing to meet strict global standards: temperature cycling (-55°C to +125°C), humidity resistance (85% RH at 85°C for 1,000 hours), and electrostatic discharge (ESD) protection (2kV human-body model). This commitment to durability has made TI a trusted partner for Boeing, Siemens, and Lockheed Martin—all of which rely on TI’s legacy memory components to maintain critical older systems that cannot be easily replaced or upgraded.
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Veelgestelde vragen (FAQ)
What is the SMJ64C16S-55JDM, and how does it work in legacy systems?
The SMJ64C16S-55JDM is a 16K×8 hermetic CMOS SRAM that stores temporary data for legacy industrial, aerospace, and defense systems. It uses static memory technology—no power refresh is needed—to retain 16,384 independent 8-bit data values. Via parallel CMOS-compatible pins, it reads/writes data in 55ns, syncing with legacy controllers (e.g., 54LS TTL PLCs) to ensure real-time performance without lag.
Why is 55ns access time important for industrial data loggers?
Industrial data loggers capture sensor data at intervals as short as 2ms, requiring memory that can store/retrieve data quickly. A 55ns access time means the SRAM can process one data point in 55 billionths of a second—fast enough to keep up with 18MHz controller clock speeds. Slower 70ns SRAMs would cause buffer overflow, leading to lost data points that result in incomplete quality control records or machine health monitoring gaps.
Hoe verbetert het JDM-24 pakket de betrouwbaarheid in kust- of industriële omgevingen?
Coastal and industrial environments expose electronics to salt, dust, or chemicals that corrode plastic and metal. The JDM-24’s hermetic ceramic enclosure seals the SRAM in an inert gas, blocking contaminants. Its J-lead pins also create a larger solder joint area with PCBs than straight pins, resisting corrosion and vibration. This design ensures 10+ years of use vs. 2–3 years for plastic DIP SRAMs in these harsh conditions.
Welke voordelen biedt CMOS-technologie voor dit SRAM in vergelijking met TTL?
CMOS technology reduces power consumption by 60% (85mW vs. 210mW for TTL SRAMs), which is vital for battery-powered test tools or energy-constrained industrial systems. It also provides a wider noise margin (0.4V–0.5V vs. 0.3V for TTL), making the SRAM more resistant to electrical interference from factory motors or radar systems—cutting data corruption errors by 35%.
Is the SMJ64C16S-55JDM compatible with legacy mixed-signal systems?
Yes. It works seamlessly with mixed-signal legacy systems (e.g., TTL controllers paired with CMOS sensors) thanks to its dual compatibility with TI’s 54LS TTL and 74HC/74HCT CMOS logic families. Its CMOS input/output levels and wide noise margin eliminate the need for logic level translators. It also fits existing JDM-24 sockets, so technicians can replace older SRAMs without modifying PCBs—saving time and avoiding costly redesigns.