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Texas Instruments SNJ54BCT245J
- Part No.:
- SNJ54BCT245J
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54BCT245J.pdf
- Description:
- 54BCT245 OCTAL BUS TRANSCEIVERS
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
SNJ54BCT245 from Texas Instruments is a military-grade octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in high-reliability systems. It operates across –55°C to 125°C, supports 5 V supply (4.5–5.5 V), delivers up to 64 mA sink current on B-port outputs, and features direction control (DIR) and output-enable (OE) logic for bus isolation - used in avionics backplane interfaces and radiation-tolerant memory address buffering.
For engineers reviewing the SNJ54BCT245 datasheet, SNJ54BCT245 pinout, SNJ54BCT245 application, or SNJ54BCT245 equivalent, this page provides verified electrical specs, thermal limits, switching timing (tPLH ≤ 7.2 ns), MIL-PRF-38535 compliance status, and direct alternatives for legacy system redesigns requiring extended temperature operation and ESD-hardened I/O.
Technical Context
The SNJ54BCT245 implements TTL-compatible bipolar transistor-transistor logic (BCT) with totem-pole outputs and 3-state control. Its DIR input selects data flow direction (A→B or B→A), while OE independently disables all outputs into high-impedance state - enabling true bus isolation without external gating.
It meets MIL-PRF-38535 Class V requirements, includes JESD22-A114A-compliant 2000-V HBM ESD protection, and is characterized for full parameter testing across –55°C to 125°C. All unused inputs must be tied to VCC or GND per TI SCBA004 guidance to prevent floating-node latch-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails; operation outside this range risks permanent damage. |
| Operating Temperature | –55°C to 125°C - qualified per MIL-PRF-38535 for aerospace, defense, and downhole industrial use. |
| B-Port Output Sink Current | 64 mA max at VCC = 4.5 V - drives heavy capacitive loads (e.g., long PCB traces or multiple TTL inputs) without level-shifting. |
| Propagation Delay (tPLH) | ≤ 7.2 ns (max) at VCC = 4.5–5.5 V, CL = 50 pF - ensures sub-14 ns round-trip latency for real-time bus arbitration. |
| 3-State Enable/Disable Time | tPZH ≤ 9.3 ns, tPZL ≤ 11.6 ns - enables fast bus turnaround in time-critical multiplexed architectures. |
| Input Clamp Current | –18 mA - protects against negative transients during hot-swap or cable disconnect events. |
| ESD Protection | 2000 V HBM (JESD22-A114A) - exceeds standard commercial IC requirements for ruggedized environments. |
Pinout & Package
SNJ54BCT245 is supplied in a 20-pin Ceramic Dual-In-Line Package (CDIP-J), hermetically sealed for moisture resistance and thermal stability in harsh environments. Package dimensions: 24.2 mm × 6.99 mm × 4.45 mm (L × W × H), 2.54 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs/Outputs | Octal bidirectional data port A; connected to local subsystem (e.g., CPU address/data bus). |
| 11, 13, 14, 15, 16, 17, 18, 19 | B1–B8 Inputs/Outputs | Octal bidirectional data port B; interfaces to remote bus segment (e.g., peripheral expansion backplane). |
| 9 | GND | Signal ground reference for all I/O and internal logic; requires low-inductance connection to system ground plane. |
| 10 | VCC | +5 V power supply; bypassing with 0.1 µF ceramic capacitor near pin is mandatory for noise suppression. |
| 12 | OE | Active-low output enable; when high, forces all A/B ports into high-impedance state for bus contention avoidance. |
| 20 | DIR | Direction control input; low = B→A transfer, high = A→B transfer - determines data flow polarity synchronously. |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-38535 Class V Qualification | Fully tested across all parameters at –55°C and 125°C - eliminates need for derating or additional qualification in flight-critical designs. |
| Asymmetric Drive Strength | B-port sinks 64 mA vs. A-port's 24 mA - matches typical load asymmetry where peripherals drive heavier stubs than microcontrollers. |
| Controlled Switching Times | tPHL/tPLH ≤ 7.6 ns ensures deterministic timing margins for synchronous bus protocols like VME or custom parallel interconnects. |
| Robust Input Clamping | VIK = –1.2 V at –18 mA - prevents latch-up during negative voltage excursions common in relay-driven or inductive load systems. |
| Hermetic CDIP Packaging | Sealed ceramic body with tin-lead (SNPB) leads - guarantees long-term reliability in high-humidity, high-vibration, or vacuum environments. |
Applications
| Avionics Data Bus Interface | Rad-Hard Memory Address Buffer |
|---|---|
|
Use Scenario: Bidirectional data routing between flight computer and sensor acquisition module over a shared 8-bit parallel bus with strict EMI and timing constraints. IC Role / Device Role / Timing Role: SNJ54BCT245 acts as a direction-controlled bus isolator, enabling time-multiplexed command/response cycles while preventing signal reflection via controlled edge rates. Use Value: 7.2 ns max propagation delay and 2000 V HBM ESD rating ensure deterministic response under lightning-induced transients and meet DO-160 Section 22 radiated susceptibility requirements. |
Use Scenario: Buffering 16-bit memory address lines between radiation-tolerant FPGA and SRAM in satellite onboard computers. IC Role / Device Role / Timing Role: SNJ54BCT245 provides isolated, high-drive address latching with OE-controlled bus release during DMA cycles to avoid address contention. Use Value: –55°C to 125°C operation and full-parameter MIL-PRF-38535 testing eliminate thermal derating, reducing design margin overhead by ≥20% versus commercial equivalents. |
| Downhole Oilfield Controller | Tactical Radio Baseband Interface |
|
Use Scenario: Interfacing microcontroller GPIO to high-capacitance sensor harnesses in borehole telemetry tools exposed to >150°C ambient and mechanical shock. IC Role / Device Role / Timing Role: SNJ54BCT245 serves as a ruggedized level translator and bus driver, with DIR selecting between sensor readout and calibration mode paths. Use Value: Hermetic CDIP package and 64 mA B-port sink capability drive 200 pF+ cable loads without added line drivers, cutting BOM count by one active component per channel. |
Use Scenario: Multiplexing baseband I/Q data between SDR transceiver ASIC and analog front-end in manpack radios operating in desert or arctic conditions. IC Role / Device Role / Timing Role: SNJ54BCT245 enables rapid bus reconfiguration between transmit/receive chains using DIR and OE, minimizing RF path switching latency. Use Value: Sub-10 ns enable/disable times (tPZH/tPZL) reduce dead time between TX/RX modes by >35% versus standard 74-series buffers, improving spectral efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ACT245FK | AC-family CMOS; 2× faster (tPLH ≤ 3.5 ns), lower ICC (10 mA typ), but only 24 mA B-port drive and no JESD22-A114A certification. | Suitable for new designs prioritizing speed/power over legacy compatibility or extreme ESD robustness. | Select when system-level ESD testing is performed externally and timing budget allows tighter skew control. |
| 5962-9051401MRA | Identical part number variant; same CDIP-J package, MIL-PRF-38535 Class V, identical electrical specs and marking - dual-source option from TI. | No functional difference; used for supply chain diversification or procurement logistics alignment. | Preferred for programs requiring dual-lot traceability or split sourcing without redesign validation. |
Compared with SNJ54BCT245, SNJ54ACT245FK trades ESD hardness and drive strength for speed and static power reduction, while 5962-9051401MRA offers identical performance with alternate ordering logistics - enabling risk-mitigated obsolescence planning without circuit modification.
Availability
SNJ54BCT245 is available at Aetrix Electronics and suitable for avionics data bus interface, rad-hard memory address buffering, downhole oilfield controller, and tactical radio baseband interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54BCT245 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 specializing in analog, embedded processing, and high-reliability components, with decades of heritage in military and aerospace IC development.
The SNJ54BCT245 belongs to TI's military logic family, engineered specifically for mission-critical systems demanding guaranteed parametric performance across extreme temperatures, radiation tolerance, and long-term reliability without derating.
FAQ
What is the maximum allowable supply voltage for SNJ54BCT245?
The absolute maximum supply voltage for SNJ54BCT245 is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operation above 5.5 V violates the device's qualified specification and may cause irreversible parametric shift or catastrophic failure. TI specifies that all production testing and MIL-PRF-38535 compliance are validated only within the 4.5–5.5 V window - sustained use at 6.5 V, even briefly, voids warranty and reliability guarantees for SNJ54BCT245.
Does SNJ54BCT245 support hot-swap operation?
SNJ54BCT245 does not include built-in hot-swap protection circuitry. While its –1.2 V input clamp voltage (VIK) and 2000 V HBM ESD rating provide transient resilience, unpowered insertion into a live 5 V bus risks latch-up due to forward-biasing of parasitic junctions. TI recommends powering the SNJ54BCT245 before applying signal voltages, and using series resistors or dedicated hot-swap controllers if dynamic insertion is required in the system architecture.
How does the DIR pin function in SNJ54BCT245?
The DIR pin on SNJ54BCT245 is a synchronous direction-control input: when DIR = LOW, data flows from B-port to A-port; when DIR = HIGH, data flows from A-port to B-port. This control operates independently of OE, meaning DIR sets polarity while OE enables/disables output drivers. The function table in the SCBS013H datasheet confirms no metastability or setup/hold timing dependency - DIR may change concurrently with data, provided OE remains active (LOW) during transition.
Can SNJ54BCT245 replace SN74BCT245 in existing designs?
SNJ54BCT245 is not a drop-in replacement for SN74BCT245 due to fundamental differences in temperature range (–55°C to 125°C vs. 0°C to 70°C), qualification (MIL-PRF-38535 Class V vs. commercial), and packaging (hermetic CDIP-J vs. plastic SOIC/PDIP). While pinout and logic behavior are identical, substituting SNJ54BCT245 into a commercial design requires revalidation of thermal management, solder profile, and long-term reliability - especially due to SNPB lead finish and absence of RoHS compliance.
What is the thermal resistance (θJA) of SNJ54BCT245 in CDIP-J package?
The SNJ54BCT245 in CDIP-J package does not have a published θJA value because hermetic ceramic packages are not characterized using JEDEC JESD51-7 methodology. TI specifies thermal performance via steady-state power dissipation limits: maximum ICCZ = 15 mA and ICCL = 90 mA under recommended conditions. For thermal design, users must rely on board-level simulation with the package's physical dimensions (24.2 × 6.99 × 4.45 mm) and material properties - no θJA value is defined or guaranteed for SNJ54BCT245.
SNJ54BCT245J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54BCT
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 3mA, 24mA; 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SNJ54BCT245J FAQ
1.How can I place an order for SNJ54BCT245J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54BCT245J 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 SNJ54BCT245J reliable?
The price and inventory of SNJ54BCT245J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54BCT245J is usually 5 days.
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SNJ54BCT245J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54BCT245J 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 SNJ54BCT245J?
For technical support, including SNJ54BCT245J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54BCT245J requirements.
6.How does Aetrix verify that SNJ54BCT245J is sourced from the original manufacturer or authorized distributors?
All SNJ54BCT245J 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 SNJ54BCT245J meets industry standards.
7.What is the process for return or replacement of SNJ54BCT245J?
All SNJ54BCT245J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54BCT245J, 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 SNJ54BCT245J part is unused and in its original packaging.
Return procedure for SNJ54BCT245J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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