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Texas Instruments SNJ54BCT541FK
- Part No.:
- SNJ54BCT541FK
- Manufacturer:
- Texas Instruments
- Package:
- 20-CLCC
- Datasheet:
-
SNJ54BCT541FK.pdf
- Description:
- OCTAL BUFFERS/DRIVERS WITH 3-STA
- Quantity:
- Payment:
- Shipping:
Inventory:2,909
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Product details
Overview
SNJ54BCT541FK from Texas Instruments is a military-grade octal buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in high-reliability systems. It operates from 4.5 V to 5.5 V, features BiCMOS technology, supports –55°C to 125°C operation, and uses a 20-pin LCCC (FK) package with data flow-through pinout.
For engineers reviewing the SNJ54BCT541FK datasheet, SNJ54BCT541FK pinout, SNJ54BCT541FK application, or SNJ54BCT541FK equivalent, this page delivers verified electrical specs, military-qualified thermal and switching performance, dual active-low output-enable control logic, and precise LCCC mechanical data - all critical for aerospace, defense, and ruggedized embedded designs.
Technical Context
The SNJ54BCT541FK implements two independent 4-bit 3-state output-enable gates (OE1/OE2), each controlling four outputs via a 2-input AND gate with active-low logic: either OE high forces all eight Y outputs into high-impedance. Its P-N-P input structure minimizes DC loading on upstream drivers, while BiCMOS design reduces ICCZ quiescent current to 5–7 mA at VCC = 5.5 V.
Propagation delays are tightly specified across temperature: tPLH/tPHL ≤ 6.3 ns (max), tPZH/tPZL ≤ 12.4 ns (max), and tPHZ/tPLZ ≤ 8.6 ns (max) under 50 pF load. Absolute maximum ratings include 7 V supply tolerance and –0.5 V to 5.5 V output voltage range in disabled state - enabling robust hot-swap and mixed-voltage interface handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and tolerant of power rail droop. |
| Operating Temperature | –55°C to +125°C - qualified per MIL-PRF-38535 for extended environmental reliability. |
| Output Drive Capability | IOL = 48 mA (min), IOH = –12 mA (min) - sufficient to drive heavy capacitive bus loads without external buffers. |
| 3-State Leakage Current | IOZL = –50 µA, IOZH = 50 µA - ensures minimal signal coupling during high-impedance state in multiplexed systems. |
| Propagation Delay | tPLH/tPHL ≤ 6.3 ns (max) at VCC = 4.5–5.5 V, CL = 50 pF - enables timing-critical address/data path buffering in high-speed memory interfaces. |
| Input Clamp Current | IIK = –18 mA - protects inputs against transient overvoltage events common in avionics and industrial backplanes. |
| Quiescent Supply Current | ICCZ = 5–7 mA at VCC = 5.5 V - low standby power essential for thermally constrained LCCC-packaged systems. |
Pinout & Package
LCCC-20 (FK) package: leadless ceramic chip carrier, 8.89 mm × 8.89 mm body, 1.27 mm terminal pitch, gold-plated terminals, hermetically sealable, JEDEC MS-004 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | Non-inverting data inputs; P-N-P structure reduces DC loading on preceding logic stages. |
| 9 | GND | Ground reference for all internal circuitry and output stage return path. |
| 10 | VCC | Positive supply rail (4.5–5.5 V); decoupling required within 10 mm for stable high-speed operation. |
| 11, 12 | OE1, OE2 | Active-low 3-state enable controls; either high disables all eight outputs simultaneously. |
| 13–20 | Y1–Y8 Outputs | Buffered, non-inverting 3-state outputs; capable of sinking 48 mA or sourcing 12 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Data Flow-Through Pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - simplifies PCB routing and minimizes trace crosstalk in dense layouts. |
| Dual Independent Output Enables | OE1 and OE2 allow partitioned bus control - e.g., A1–A4/Y1–Y4 and A5–A8/Y5–Y8 managed separately for interleaved memory access. |
| BiCMOS Process Technology | Combines bipolar speed and CMOS low-power traits - achieves sub-7 ns propagation delay with <7 mA ICCZ quiescent current. |
| P-N-P Input Structure | Reduces input DC loading to ≤0.6 mA (IIL), preventing excessive fanout degradation in cascaded TTL systems. |
| Military Qualification | Fully compliant with MIL-PRF-38535 Class B screening - includes burn-in, temperature cycling, and hermeticity testing for mission-critical use. |
Applications
| Avionics Data Bus Interface | Tactical Radio Memory Buffering |
|---|---|
Use Scenario: Isolating and driving ARINC 429 or MIL-STD-1553B address/data lines between processor and I/O modules in airborne computing units. IC Role / Device Role / Timing Role: Octal buffer providing level-shifted, slew-controlled drive to reduce EMI and ensure signal integrity across long backplane traces. Use Value: 6.3 ns max propagation delay and 48 mA sink capability maintain timing margins in 10 MHz+ synchronous bus protocols. |
Use Scenario: Buffering memory address registers in software-defined radio (SDR) transceivers operating in extreme temperature environments. IC Role / Device Role / Timing Role: Address latch driver enabling fast read/write cycles to SRAM/Flash while maintaining isolation between CPU and peripheral buses. Use Value: –55°C to +125°C operation and low ICCZ support uninterrupted function in unheated/ungoverned outdoor enclosures. |
| Ruggedized Industrial PLC Backplane | Spacecraft Onboard Computer I/O Expansion |
Use Scenario: Driving parallel I/O expansion cards in programmable logic controllers exposed to vibration, humidity, and wide ambient swings. IC Role / Device Role / Timing Role: Bus driver isolating field I/O modules from main controller; dual OE pins enable staggered activation to limit inrush current. Use Value: LCCC package provides superior thermal dissipation and mechanical stability versus plastic SOIC in high-vibration environments. |
Use Scenario: Interfacing radiation-hardened microprocessors with EEPROM and FPGA configuration memory in satellite subsystems. IC Role / Device Role / Timing Role: Radiation-tolerant buffer ensuring reliable address/data transmission despite single-event upsets (SEUs). Use Value: Hermetic LCCC packaging and MIL-PRF-38535 qualification provide proven resistance to total ionizing dose (TID) and displacement damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ACT541FK | AC-family CMOS; 2.0 V–6.0 V supply; lower ICCZ (2 µA), faster tPLH (3.5 ns typ), but reduced drive (24 mA IOL) | Better for low-power, high-speed digital systems where bus capacitance is <30 pF and voltage flexibility is needed | Select when power efficiency and wider VCC range outweigh need for 48 mA drive strength |
| SNJ54LS244J | LS-TTL family; 4.75–5.25 V only; higher ICC (38 mA typical), slower tPLH (15 ns max), no BiCMOS leakage advantage | Suitable for legacy TTL-only systems requiring pin-compatible replacement without redesign | Choose only for drop-in LS-TTL upgrades where BiCMOS benefits are not required |
Compared with SNJ54BCT541FK, SNJ54ACT541FK offers superior speed and supply flexibility but sacrifices output drive for low-power operation, while SNJ54LS244J provides direct TTL compatibility at the cost of speed, power, and modern process advantages.
Availability
SNJ54BCT541FK is available at Aetrix Electronics and suitable for avionics data bus interface, tactical radio memory buffering, ruggedized industrial PLC backplane, spacecraft onboard computer I/O expansion, and other high-reliability applications requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for SNJ54BCT541FK 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 global semiconductor leader with over 90 years of analog and embedded processing innovation, serving aerospace, defense, industrial, and automotive markets.
The SNJ54BCT541FK belongs to TI's military-grade BCT logic family, engineered specifically for high-speed, high-reliability bus interfacing in harsh-environment systems where signal integrity, thermal resilience, and long-term supply assurance are mandatory.
FAQ
What is the absolute maximum supply voltage rating for SNJ54BCT541FK?
The absolute maximum supply voltage for SNJ54BCT541FK is –0.5 V to 7 V. Exceeding 7 V risks permanent device damage, even momentarily. For reliable operation, maintain VCC within the recommended 4.5 V to 5.5 V range. This margin allows for transient spikes in military power systems while preserving latch-up immunity and long-term reliability.
How does the dual output-enable architecture of SNJ54BCT541FK improve system-level bus management?
The SNJ54BCT541FK uses two independent active-low output-enable inputs (OE1 and OE2), each controlling four outputs. This allows partitioned bus control - for example, enabling Y1–Y4 while holding Y5–Y8 in high-Z - reducing contention during multi-master arbitration or staggered memory access. The AND-gate logic ensures fail-safe disable if either OE rises, enhancing fault tolerance in safety-critical systems.
Is SNJ54BCT541FK compatible with standard 5 V TTL logic families?
Yes, SNJ54BCT541FK is fully compatible with standard 5 V TTL logic families. Its VIH (2.0 V min), VIL (0.8 V max), VOH (2.4 V min at –12 mA), and VOL (0.55 V max at 48 mA) meet or exceed TTL voltage thresholds. The P-N-P input structure also matches TTL's input current profile, ensuring correct fanout and noise margin without level-shifting circuitry.
What is the thermal resistance (θJA) of the SNJ54BCT541FK LCCC package?
The SNJ54BCT541FK uses an LCCC (FK) package with no published θJA value because JEDEC standard θJA testing assumes plastic packages with defined board layout conditions - which do not apply to hermetic ceramic carriers. Instead, thermal performance is characterized by θJC (junction-to-case), and system-level dissipation must be validated using actual mounting conditions, heatsinking, and airflow per MIL-STD-883 Method 1012.1.
Can SNJ54BCT541FK be used in hot-swap applications?
Yes, SNJ54BCT541FK supports controlled hot-swap operation due to its –0.5 V to 5.5 V output voltage rating in the disabled state and robust input clamp current (–18 mA). To ensure safe insertion, tie OE1 and OE2 to VCC via pull-up resistors (value determined by driver sink capability) before applying VCC, and sequence VCC before signal inputs per MIL-STD-1399 guidelines.
SNJ54BCT541FK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54BCT
- Package/Case:
- 20-CLCC
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LCCC (8.89x8.89)
SNJ54BCT541FK FAQ
1.How can I place an order for SNJ54BCT541FK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54BCT541FK on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SNJ54BCT541FK reliable?
The price and inventory of SNJ54BCT541FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54BCT541FK is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54BCT541FK transactions.
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4.How is shipping managed for SNJ54BCT541FK?
SNJ54BCT541FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54BCT541FK 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 SNJ54BCT541FK?
For technical support, including SNJ54BCT541FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54BCT541FK requirements.
6.How does Aetrix verify that SNJ54BCT541FK is sourced from the original manufacturer or authorized distributors?
All SNJ54BCT541FK 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 SNJ54BCT541FK meets industry standards.
7.What is the process for return or replacement of SNJ54BCT541FK?
All SNJ54BCT541FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54BCT541FK, 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 SNJ54BCT541FK part is unused and in its original packaging.
Return procedure for SNJ54BCT541FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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