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Texas Instruments SNJ54BCT541J
- Part No.:
- SNJ54BCT541J
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54BCT541J.pdf
- Description:
- OCTAL BUFFERS/DRIVERS WITH 3-STA
- Quantity:
- Payment:
- Shipping:
Inventory:3,042
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Product details
Overview
SNJ54BCT541J 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 data flow-through pinout with inputs and outputs on opposite package sides.
For engineers reviewing the SNJ54BCT541J datasheet, SNJ54BCT541J pinout, SNJ54BCT541J application, or SNJ54BCT541J equivalent, this device is selected for deterministic bus isolation, low-ICCZ standby current (5–7 mA), P-N-P input structure reducing DC loading, and dual active-low output-enable control enabling precise 3-state timing in avionics and defense computing.
Technical Context
The SNJ54BCT541J implements two independent 4-bit channels, each controlled by an active-low 2-input AND gate (OE1/OE2), ensuring all eight outputs enter high-impedance state if either enable is high. Its BiCMOS architecture combines bipolar output drivers for high sink current (96 mA per output) with CMOS input stages for low input current (±0.6 mA).
Input clamping (VIK = –1.2 V), output voltage limits (VOH ≥ 2.0 V at –12 mA, VOL ≤ 0.55 V at 48 mA), and propagation delays (tPLH/tPHL = 1.7–6.3 ns) are specified across the full –55°C to 125°C military temperature range, with absolute maximum ratings including 7 V supply tolerance and –0.5 V to 7 V input voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and tolerant of power rail variation in ruggedized systems. |
| Operating Temperature | –55°C to 125°C - qualified per MIL-PRF-38535 for use in aerospace, defense, and downhole industrial environments. |
| Output Drive | 96 mA sink per output - sufficient to drive heavy capacitive bus loads (e.g., >100 pF) without signal degradation. |
| 3-State Enable Logic | Active-low 2-input AND (OE1 & OE2) - enables flexible bus arbitration using either single or dual enable signals. |
| Propagation Delay | 1.7 ns min / 6.3 ns max (A→Y) - ensures tight timing margins in high-speed address/data latching applications. |
| Standby ICCZ | 5–7 mA - significantly lower than legacy TTL buffers, reducing system quiescent power in powered-down states. |
| Input Structure | P-N-P input stage - minimizes DC loading on upstream drivers, preserving fan-out capability in cascaded logic networks. |
Pinout & Package
SNJ54BCT541J is housed in a 20-pin Ceramic Dual-In-Line Package (CDIP-J), hermetically sealed, with 0.3-inch body width and through-hole mounting. Pin 1 is identified by a notch or beveled corner on the package top edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE1) | Output Enable 1 | Active-low control input for first four outputs (Y1–Y4); high forces Y1–Y4 into high-Z. |
| 2–9 (A1–A8) | Data Inputs | Eight non-inverting input terminals; A1–A4 feed Y1–Y4, A5–A8 feed Y5–Y8. |
| 10 (GND) | Ground Reference | Power return path for logic and output stages; must be low-inductance connection in noise-sensitive systems. |
| 11 (VCC) | Positive Supply | +4.5 V to +5.5 V supply for internal logic and output drivers; requires local 0.1 µF ceramic decoupling. |
| 12 (OE2) | Output Enable 2 | Active-low control input for second four outputs (Y5–Y8); high forces Y5–Y8 into high-Z. |
| 13–20 (Y1–Y8) | 3-State Outputs | Eight buffered, non-inverting outputs; each capable of sinking 96 mA while maintaining VOL ≤ 0.55 V. |
Key Features
| Feature | Design Value |
|---|---|
| Data Flow-Through Pinout | Inputs (A1–A8, OE1, OE2) on left side, outputs (Y1–Y8) on right side - simplifies PCB routing and reduces crosstalk in dense backplane layouts. |
| BiCMOS Output Stage | Combines bipolar pull-down transistors (for high sink current) with CMOS input logic - achieves TTL-compatible levels with CMOS-like input loading. |
| Dual Independent Enables | OE1 controls Y1–Y4; OE2 controls Y5–Y8 - allows partial bus gating without affecting parallel data paths. |
| P-N-P Input Structure | Reduces input current to ±0.6 mA - increases effective fan-out when driving multiple SNJ54BCT541J inputs from a single source. |
| MIL-STD-883 Qualified | Tested per Method 5005 for screening and Method 5006 for burn-in - ensures reliability in mission-critical hardware with extended field life. |
Applications
| Avionics Data Bus Interface | Secure Military Memory Subsystem |
|---|---|
Use Scenario: Isolating processor address lines from shared ARINC 429 or MIL-STD-1553 bus transceivers during mode switching. IC Role / Device Role / Timing Role: Octal buffer providing level-shifted, slew-controlled address latching with simultaneous 3-state disable via OE1/OE2 coordination. Use Value: Prevents bus contention during CPU reset or mode transitions while maintaining <6.3 ns propagation delay for real-time interrupt response. | Use Scenario: Driving encrypted memory address registers in tamper-resistant FPGAs used in secure comms modules. IC Role / Device Role / Timing Role: High-drive buffer isolating FPGA I/O banks from radiation-hardened SRAM arrays with precise OE-controlled tristate windows. Use Value: Delivers 96 mA sink current per line to overcome trace capacitance in multi-layer encrypted memory stacks operating at –55°C. |
| Ruggedized Industrial PLC Backplane | Tactical Vehicle Control Unit |
Use Scenario: Buffering I/O expansion module addresses across long, noisy backplane traces in oilfield drilling controllers. IC Role / Device Role / Timing Role: Bus driver with P-N-P inputs minimizing loading on microcontroller GPIOs and BiCMOS outputs sustaining signal integrity over 15 cm FR4 runs. Use Value: Maintains VOL ≤ 0.55 V under 48 mA load across temperature extremes, preventing false reads in safety-critical ladder logic execution. | Use Scenario: Interfacing vehicle health monitoring MCU to distributed sensor nodes via isolated CAN and discrete control buses. IC Role / Device Role / Timing Role: Address register buffer enabling dynamic reconfiguration of sensor polling sequences using dual OE control for channel partitioning. Use Value: Enables independent enable/disable of front/rear sensor clusters without software overhead, reducing ECU wake-up latency by 12 ns average. |
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 |
|---|---|---|---|
| SNJ54ACT541J | AC-series CMOS; 4.5–5.5 V supply; 24 mA output drive; faster tPLH (2.5 ns typ) but lower sink current. | Lower drive strength limits use in high-capacitance bus scenarios; better suited for low-power logic translation than heavy bus loading. | Select when power efficiency and speed outweigh drive requirement; verify VOL compliance at target load. |
| SNJ54LS244J | LS-TTL series; 4.75–5.25 V supply; 24 mA output drive; higher ICCZ (15 mA) and slower tPHL (15 ns max). | Lacks BiCMOS benefits; unsuitable for extended temperature operation beyond 70°C; higher static power in standby. | Acceptable only for legacy LS-TTL system upgrades where pin compatibility is mandatory and thermal margin exists. |
Compared with SNJ54ACT541J and SNJ54LS244J, the SNJ54BCT541J uniquely balances military-temperature operation, 96 mA sink capability, and sub-7 ns propagation-making it irreplaceable for high-reliability bus-driving where both drive strength and timing precision are non-negotiable.
Availability
SNJ54BCT541J is available at Aetrix Electronics and suitable for avionics data bus interface, secure military memory subsystems, ruggedized industrial PLC backplanes, and tactical vehicle control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54BCT541J 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 space-grade IC development.
The SNJ54BCT541J belongs to TI's 54BCT logic family, engineered specifically for high-drive, low-ICCZ, and extended-temperature operation in mission-critical computing and communication infrastructure.
FAQ
What is the recommended power-up sequence for SNJ54BCT541J to ensure reliable 3-state initialization?
To guarantee high-impedance outputs during power-up, tie OE1 and OE2 to VCC via pullup resistors (minimum value determined by driver sink capability). This prevents bus contention before system firmware asserts valid enable states. The SNJ54BCT541J does not include internal power-on reset circuitry, so external biasing is mandatory for robust initialization in avionics and defense platforms where SNJ54BCT541J is deployed.
Does SNJ54BCT541J support hot-swap or live-insertion in backplane applications?
No, SNJ54BCT541J is not rated for hot-swap operation. Its absolute maximum ratings do not cover powered insertion events, and the absence of bus-hold or Ioff protection means unpowered devices may experience latch-up or excessive current if VCC is applied after signal voltages. For backplane systems requiring live insertion, SNJ54BCT541J must be powered and enabled only after mechanical mating is complete and system power sequencing is verified.
How does the P-N-P input structure of SNJ54BCT541J affect fan-out when driving multiple inputs?
The P-N-P input stage reduces input current to –0.6 mA (low) and +20 µA (high), enabling one SNJ54BCT541J output to drive up to 10–12 other SNJ54BCT541J inputs without exceeding VIH/VIL thresholds. This directly improves fan-out versus standard TTL buffers and reduces loading on upstream microcontrollers in memory-address distribution trees where SNJ54BCT541J is used.
Can SNJ54BCT541J be operated at 3.3 V supply voltage?
No, SNJ54BCT541J is specified only for 4.5 V to 5.5 V operation. At 3.3 V, VOH falls below TTL high-level threshold (2.0 V minimum), and internal BiCMOS gate biasing fails to activate output transistors reliably. Using SNJ54BCT541J outside its rated supply range risks functional failure and is not supported-even temporarily-for any duration in systems relying on SNJ54BCT541J performance guarantees.
What packaging and marking details confirm authenticity of SNJ54BCT541J?
Authentic SNJ54BCT541J devices are supplied in CDIP-J packages with "SNJ54BCT541J" laser-marked on the top surface, accompanied by TI's logo and date code. Counterfeit risk is mitigated by verifying the MIL-STD-883 test certification label, lead finish (SnPb per J-STD-006), and tube packaging marked "TI" and "5962-9074901MRA". Aetrix Electronics provides full traceability documentation for every SNJ54BCT541J shipment.
SNJ54BCT541J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54BCT
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SNJ54BCT541J FAQ
1.How can I place an order for SNJ54BCT541J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54BCT541J 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 SNJ54BCT541J reliable?
The price and inventory of SNJ54BCT541J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54BCT541J is usually 5 days.
3.What payment methods are accepted for SNJ54BCT541J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54BCT541J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54BCT541J?
SNJ54BCT541J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54BCT541J 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 SNJ54BCT541J?
For technical support, including SNJ54BCT541J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54BCT541J requirements.
6.How does Aetrix verify that SNJ54BCT541J is sourced from the original manufacturer or authorized distributors?
All SNJ54BCT541J 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 SNJ54BCT541J meets industry standards.
7.What is the process for return or replacement of SNJ54BCT541J?
All SNJ54BCT541J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54BCT541J, 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 SNJ54BCT541J part is unused and in its original packaging.
Return procedure for SNJ54BCT541J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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