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Texas Instruments SNJ54BCT244W
- Part No.:
- SNJ54BCT244W
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SNJ54BCT244W.pdf
- Description:
- 54BCT244 OCTAL BUFFERS/DRIVERS W
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Inventory:1,000
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Product details
Overview
SNJ54BCT244W from Texas Instruments is a military-grade octal noninverting 3-state buffer/line driver with two independent 4-bit sections, 5 V supply operation, −55°C to 125°C temperature range, and CFP (W) ceramic flatpack package. It drives memory address buses and clock distribution lines in high-reliability avionics and defense systems.
For engineers reviewing the SNJ54BCT244W datasheet, SNJ54BCT244W pinout, SNJ54BCT244W application, or SNJ54BCT244W equivalent, key selection criteria include output drive strength (64 mA sink), propagation delay (≤5.5 ns), high-impedance enable timing (tPZH/tPLZ ≤8.9 ns), and MIL-STD-883-compliant ESD protection (>2000 V).
Technical Context
The SNJ54BCT244W implements BiCMOS logic architecture combining bipolar input stages for low DC loading and CMOS output stages for high current drive and low ICCZ quiescent current (4–10 mA). Its P-N-P input structure minimizes input current draw under static conditions.
Each of its two 4-bit sections features active-low OE control enabling independent 3-state management of Y outputs. When OE is low, A→Y data passes transparently; when OE is high, outputs enter high-impedance state-critical for bus arbitration and memory address multiplexing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - supports standard 5 V TTL/CMOS system rails with margin for ripple and drop. |
| Output Drive (IOL) | 64 mA - sufficient to drive heavy capacitive loads (e.g., >50 pF) and multiple TTL inputs on shared buses. |
| Propagation Delay (tPHL/tPLH) | ≤5.5 ns at 5 V, 50 pF - enables reliable operation in high-speed address/data paths up to ~180 MHz toggle rate. |
| 3-State Enable/Disable Time | tPZH/tPLZ ≤8.9 ns - ensures fast bus release and acquisition, minimizing contention windows in multi-driver systems. |
| Operating Temperature | −55°C to 125°C - qualified per MIL-PRF-38535 for deployment in harsh-environment military platforms. |
| ESD Protection | >2000 V HBM - exceeds MIL-STD-883C Method 3015, reducing field failure risk in handling and system integration. |
| Input Clamp Current | −18 mA - allows safe operation with overvoltage transients up to 7 V without latch-up or damage. |
Pinout & Package
Ceramic Flatpack (CFP, W package), 20-pin, hermetically sealed, leadless, 0.51 mm pitch, 13.0 mm × 26.2 mm footprint, 6.22 mm height - designed for high-reliability board mounting with thermal stability and moisture resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control inputs | Independent gating of each 4-bit section; asserted low enables A→Y pass-through, high forces high-Z. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for respective buffer sections; accept TTL-compatible logic levels (VIH ≥2 V, VIL ≤0.8 V). |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive bus lines directly; sink up to 64 mA or source −15 mA while maintaining VOH ≥2 V and VOL ≤0.55 V. |
| VCC (Pin 10), GND (Pin 20) | Power supply terminals | Single 5 V rail; decoupling required near pins to suppress switching noise affecting adjacent channels. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Combines low-input-current P-N-P inputs with high-drive CMOS outputs, reducing ICCZ to 4–10 mA and enabling dense bus buffering without excessive power dissipation. |
| Symmetrical OE inputs | Both sections share identical active-low enable polarity and timing specs, simplifying control logic design and PCB layout for dual-bus applications. |
| High-impedance output isolation | IOZH/IOZL ≤ ±50 µA ensures minimal leakage during 3-state mode, preventing signal corruption on shared backplanes or memory address lines. |
| MIL-STD-883 qualified | Tested per Method 3015 (ESD), Method 2019 (thermal shock), and Method 2001 (steady-state life), confirming suitability for flight-critical hardware. |
Applications
| Avionics Flight Control Bus | Tactical Radio Memory Interface |
|---|---|
Use Scenario: Buffering and isolating CPU-generated memory address signals across redundant ARINC 429 or MIL-STD-1553B subsystems. IC Role / Device Role / Timing Role: Noninverting 3-state address driver managing bidirectional access to shared PROM/EEPROM banks in real-time control loops. Use Value: Sub-6 ns propagation delay and <9 ns 3-state transition ensure deterministic timing margins for 10+ MHz address strobes under full temperature range. | Use Scenario: Driving parallel address/data buses between baseband processor and RF front-end memory in encrypted SDR radios. IC Role / Device Role / Timing Role: Octal line driver enabling simultaneous access to dual-port SRAM and configuration registers across isolated voltage domains. Use Value: 64 mA sink capability supports 10+ TTL loads per output, eliminating need for additional fanout buffers in compact SWaP-constrained modules. |
| Missile Guidance System Clock Distribution | Ground Vehicle Mission Computer I/O Expansion |
Use Scenario: Distributing synchronized clock and reset signals to multiple FPGAs and ADCs within inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Low-skew clock buffer with independent OE control for dynamic clock gating during power-save modes. Use Value: Matched tPHL/tPLH and tPZH/tPLZ specs minimize skew between channels (<0.5 ns typical), preserving setup/hold timing for high-speed sampling. | Use Scenario: Expanding GPIO and interrupt lines from a central mission computer to distributed sensor nodes in armored vehicle electronics. IC Role / Device Role / Timing Role: Bidirectional bus interface conditioner supporting hot-swap-capable peripheral add-on cards via controlled 3-state enable sequencing. Use Value: −55°C to 125°C operation and >2000 V HBM ESD rating ensure uninterrupted function during extreme thermal cycling and electromagnetic environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ACT244W | AC-series CMOS; higher speed (tPD ≤4.5 ns), lower drive (24 mA), wider VCC range (2–6 V), but no P-N-P input stage. | Better for low-power, wide-voltage systems; unsuitable where legacy TTL loading compatibility or high sink current is required. | Select SNJ54ACT244W only if system uses mixed 3.3/5 V logic and prioritizes speed over drive strength. |
| SNJ54LS244J | LS-TTL process; slower (tPD ≤25 ns), lower drive (8 mA), higher ICC (30 mA), no BiCMOS efficiency or ESD robustness. | Compatible with legacy LS designs but lacks MIL-STD-883 qualification and fails modern reliability requirements for new programs. | Choose SNJ54LS244J only for repair of obsolete equipment where form-fit-function match is mandatory and performance degradation is acceptable. |
Compared with SNJ54BCT244W, SNJ54ACT244W offers faster switching but reduced drive and no input loading advantage, while SNJ54LS244J provides pinout compatibility at the cost of speed, power efficiency, and ruggedness-making SNJ54BCT244W the optimal choice for new high-reliability 5 V bus designs.
Availability
SNJ54BCT244W is available at Aetrix Electronics and suitable for avionics flight control systems, tactical radio memory interfaces, and missile guidance clock distribution requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54BCT244W includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The SN54BCT family was developed to deliver military-qualified, high-speed, low-power bus interface ICs with enhanced ESD tolerance and thermal resilience-specifically targeting memory addressing, clock distribution, and data path conditioning in mission-critical systems.
FAQ
What is the maximum operating temperature range for SNJ54BCT244W?
The SNJ54BCT244W is characterized for operation from −55°C to 125°C, fully compliant with MIL-PRF-38535 Class B requirements. This range is validated across all electrical parameters including propagation delay, output drive, and 3-state leakage, making SNJ54BCT244W suitable for engine bay, radar, and space-qualified applications where thermal extremes are routine.
Does SNJ54BCT244W support 3.3 V logic inputs?
No, SNJ54BCT244W is a 5 V-only device with TTL-compatible input thresholds (VIH ≥2 V, VIL ≤0.8 V). While it may tolerate 3.3 V logic HIGH levels in some cases, it is not guaranteed to meet VIH minimums across temperature and voltage tolerances. For mixed-voltage systems, level-shifting circuitry or a 3.3 V–compatible alternative like SNJ54ACT244W is required-not SNJ54BCT244W.
What package type does SNJ54BCT244W use, and is it RoHS-compliant?
SNJ54BCT244W uses a ceramic flatpack (CFP, W package) with 20 leads, unsealed metal lid, and SNPB (tin-lead) lead finish. It is not RoHS-compliant due to lead content, consistent with its military specification status. The W package is hermetic, rated for high-reliability soldering profiles and long-term storage per MIL-STD-883.
Can SNJ54BCT244W replace SN74BCT244N in an existing design?
SNJ54BCT244W is not a direct replacement for SN74BCT244N due to differing temperature ranges (−55°C to 125°C vs. 0°C to 70°C), packaging (CFP vs. PDIP), and qualification level (MIL-PRF-38535 vs. commercial). While pinout and logic function match, SNJ54BCT244W requires revalidation of thermal, mechanical, and reliability performance-especially in non-military applications where cost and RoHS compliance matter.
What is the output current capability of SNJ54BCT244W, and how does it affect bus loading?
SNJ54BCT244W delivers up to 64 mA sink current per output (IOL) and −15 mA source current (IOH) at VCC = 4.5 V. This allows driving up to 10 standard TTL loads or 50+ pF of bus capacitance without signal degradation-critical for maintaining rise/fall times and noise margins in memory address or clock distribution networks where SNJ54BCT244W is deployed.
SNJ54BCT244W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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SNJ54BCT244W FAQ
1.How can I place an order for SNJ54BCT244W through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54BCT244W on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SNJ54BCT244W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54BCT244W is usually 5 days.
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Once your SNJ54BCT244W order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SNJ54BCT244W?
For technical support, including SNJ54BCT244W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54BCT244W requirements.
6.How does Aetrix verify that SNJ54BCT244W is sourced from the original manufacturer or authorized distributors?
All SNJ54BCT244W products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SNJ54BCT244W meets industry standards.
7.What is the process for return or replacement of SNJ54BCT244W?
All SNJ54BCT244W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54BCT244W, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SNJ54BCT244W part is unused and in its original packaging.
Return procedure for SNJ54BCT244W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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