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Texas Instruments SNJ54AC245J
- Part No.:
- SNJ54AC245J
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54AC245J.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:3,731
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Product details
Overview
SNJ54AC245J from Texas Instruments is a military-grade octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data bus communication in harsh-environment systems. It operates from 2 V to 6 V, accepts inputs up to 6 V, delivers ≤7 ns propagation delay at 5 V, and supports –55°C to +125°C operation - enabling use in avionics backplanes and ruggedized industrial controllers.
For engineers reviewing the SNJ54AC245J datasheet, SNJ54AC245J pinout, SNJ54AC245J application, or SNJ54AC245J equivalent, key selection criteria include its wide VCC range, direction-controlled bidirectional flow, output-enable isolation, and CDIP-20 package compatibility with legacy MIL-STD-883 compliant layouts.
Technical Context
The SNJ54AC245J implements dual 8-bit bidirectional I/O paths controlled by a single DIR input and isolated via an active-low OE signal. Its CMOS architecture ensures balanced drive strength (±24 mA at 5 V) and low static current (≤80 µA), while slow edge rates minimize output ringing on unterminated traces.
It functions in three modes: A→B data transfer (DIR = H, OE = L), B→A transfer (DIR = L, OE = L), or high-impedance isolation (OE = H). Input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), supporting mixed-voltage interfacing without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - enables interoperability across 3.3 V and 5 V subsystems without external regulators |
| Max Propagation Delay | 7 ns at 5 V - supports >100 MHz bus toggle rates in synchronous control loops |
| Output Drive | ±24 mA per pin at 5 V - sufficient to drive 50 Ω transmission lines or multiple TTL loads |
| Input Voltage Tolerance | Up to 6 V independent of VCC - allows safe interfacing with higher-voltage logic or analog monitoring signals |
| Operating Temperature | –55°C to +125°C - qualified for extended-range military and aerospace deployments |
| ESD Rating | ±3000 V HBM - meets MIL-STD-883 Class 3001 requirements for handling robustness |
Pinout & Package
SNJ54AC245J uses a 20-pin Ceramic Dual In-line Package (CDIP) with 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner adjacent to the orientation notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: HIGH enables A→B data flow; LOW enables B→A flow |
| 2–9 | A1–A8 | Port A bidirectional I/O pins - connect to source bus (e.g., microcontroller data lines) |
| 10 | GND | Ground reference for all logic and power domains |
| 11–18 | B8–B1 | Port B bidirectional I/O pins - connect to destination bus (e.g., peripheral interface) |
| 19 | OE | Active-low output enable: LOW activates transceiver; HIGH places all A/B pins in high-Z state |
| 20 | VCC | Positive supply input - must be bypassed with ≥0.1 µF ceramic capacitor near the pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2 V–6 V operation eliminates need for separate voltage translators in mixed-supply systems |
| Asynchronous Bidirectional Control | Single DIR pin configures data path direction without clock or timing constraints |
| High-Impedance Isolation | OE pin fully disconnects both buses - prevents contention during hot-swap or power sequencing |
| Ringing-Suppressed Outputs | Slower edge rates reduce EMI and overshoot on long PCB traces or unterminated stubs |
| MIL-STD-883 Qualified | Tested per Method 5005 for temperature cycling, mechanical shock, and hermeticity - suitable for flight-critical hardware |
Applications
| Avionics Data Backplane | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Bidirectional data exchange between flight computer and sensor acquisition units over extended-length parallel buses. IC Role / Device Role / Timing Role: Bus transceiver managing time-critical telemetry packet routing with deterministic latency under thermal stress. Use Value: –55°C to +125°C rating and ±3000 V HBM ensure uninterrupted operation during rapid cabin depressurization or engine bay heat exposure. |
Use Scenario: Interfacing 3.3 V FPGA-based controller with legacy 5 V I/O modules in modular automation racks. IC Role / Device Role / Timing Role: Level-flexible bus bridge enabling voltage-domain translation without external biasing or timing compensation. Use Value: 2 V–6 V VCC range and 6 V-tolerant inputs eliminate discrete level-shifter components and reduce BOM count by one IC per channel pair. |
| Military Radio Baseband Interface | Ruggedized Test Equipment |
|
Use Scenario: Isolating digital baseband signals between RF front-end ASICs and host processor in portable SATCOM terminals. IC Role / Device Role / Timing Role: Direction-controlled data conduit with OE-gated isolation during RF transmit bursts to prevent coupling noise into sensitive analog sections. Use Value: Active-low OE allows fail-safe bus disconnection using simple pull-up networks - critical for EMI-hardened designs meeting MIL-STD-461G. |
Use Scenario: Configurable signal routing between DUT interface connectors and internal measurement engines in field-deployable diagnostic gear. IC Role / Device Role / Timing Role: Reconfigurable bus switch enabling dynamic test path selection via software-controlled DIR/OE states. Use Value: CDIP-20 package provides mechanical stability and thermal mass for repeated thermal cycling during environmental validation testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC245N | Commercial-grade (–40°C to +85°C), PDIP-20, RoHS-compliant NiPdAu finish | Lacks MIL-STD-883 qualification and extended temperature range; unsuitable for defense/aerospace deployment | Select when cost-sensitive industrial or lab equipment does not require military reliability screening |
| SNJ54ACT245J | TTL-compatible input thresholds (VIH = 2 V min), identical CDIP-20 package and temp range | Enables direct replacement in legacy TTL systems without redesigning input bias networks | Choose when interfacing with older 5 V TTL logic families where AC-series input hysteresis causes marginal setup times |
Compared with SNJ54AC245J, SN74AC245N trades military reliability for lower cost and RoHS compliance, while SNJ54ACT245J retains the same package and temperature capability but adds TTL input compatibility - making it preferable for brownfield upgrades of legacy 5 V systems.
Availability
SNJ54AC245J is available at Aetrix Electronics and suitable for avionics data backplanes, industrial PLC I/O modules, and military radio baseband interfaces requiring stable component supply across extended lifecycle programs.
Supply support for SNJ54AC245J 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 logic solutions with over 50 years of aerospace and defense component experience.
The SNJ54AC245J belongs to TI's military logic family, engineered for high-reliability data routing in mission-critical platforms where extended temperature operation, hermetic packaging, and MIL-STD-883 compliance are mandatory.
FAQ
What is the operating temperature range of the SNJ54AC245J?
The SNJ54AC245J is rated for operation from –55°C to +125°C, meeting MIL-STD-883 requirements for extreme-environment deployment. This range is validated across all electrical parameters including propagation delay, drive strength, and input thresholds - ensuring consistent performance in avionics bays, engine control units, and space-qualified payloads where thermal cycling is severe.
Does the SNJ54AC245J support mixed-voltage interfacing?
Yes, the SNJ54AC245J supports mixed-voltage interfacing: its VCC range is 2 V to 6 V, and inputs tolerate up to 6 V regardless of supply voltage. This allows direct connection between 3.3 V microcontrollers and 5 V peripherals without level shifters. The SNJ54AC245J maintains valid logic thresholds (VIH = 0.7×VCC, VIL = 0.3×VCC) across the full supply range, preserving noise margins in heterogeneous systems.
How does the direction-control (DIR) pin function in the SNJ54AC245J?
The DIR pin on the SNJ54AC245J determines data flow direction: when DIR = HIGH, data passes from Port A to Port B; when DIR = LOW, data flows from Port B to Port A. This asynchronous control requires no clock or timing coordination. The SNJ54AC245J holds the selected path until DIR changes, enabling deterministic bus arbitration in real-time control systems where latency predictability is essential.
What is the maximum output drive capability of the SNJ54AC245J?
The SNJ54AC245J delivers ±24 mA per output at 5 V, with guaranteed VOL ≤ 0.44 V and VOH ≥ 3.76 V under that load. Total device output current is limited to ±75 mA. This drive strength supports direct connection to 50 Ω transmission lines, multiple TTL inputs, or LED indicators - verified across the full –55°C to +125°C range without derating, making the SNJ54AC245J suitable for high-noise industrial environments.
Is the SNJ54AC245J pin-compatible with other members of the '245 family?
Yes, the SNJ54AC245J shares identical pinout and function mapping with all 20-pin '245 variants including SN74AC245N, SNJ54ACT245J, and SN74AC245DBR. All use the same DIR/OE control scheme, A1–A8/B1–B8 I/O layout, and GND/VCC placement. However, only SNJ54AC245J and SNJ54ACT245J offer the –55°C to +125°C range and CDIP-20 package - confirming mechanical and functional interchangeability in legacy military designs.
SNJ54AC245J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54AC
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SNJ54AC245J FAQ
1.How can I place an order for SNJ54AC245J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54AC245J 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 SNJ54AC245J reliable?
The price and inventory of SNJ54AC245J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AC245J is usually 5 days.
3.What payment methods are accepted for SNJ54AC245J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54AC245J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54AC245J?
SNJ54AC245J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54AC245J 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 SNJ54AC245J?
For technical support, including SNJ54AC245J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AC245J requirements.
6.How does Aetrix verify that SNJ54AC245J is sourced from the original manufacturer or authorized distributors?
All SNJ54AC245J 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 SNJ54AC245J meets industry standards.
7.What is the process for return or replacement of SNJ54AC245J?
All SNJ54AC245J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AC245J, 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 SNJ54AC245J part is unused and in its original packaging.
Return procedure for SNJ54AC245J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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