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Texas Instruments SNJ54LVCH245AJ
- Part No.:
- SNJ54LVCH245AJ
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54LVCH245AJ.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:4,267
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Product details
Overview
SNJ54LVCH245AJ from Texas Instruments is a military-grade 3.3-V ABT octal bus transceiver with 3-state outputs, designed for bidirectional data flow between A and B buses under ±55°C to +125°C operation. It supports mixed-mode signaling (5-V inputs/outputs with 3.3-V VCC), delivers <0.8 V typical output ground bounce at 3.3 V, and features bus-hold on all data inputs to eliminate external pull resistors.
For engineers reviewing the SNJ54LVCH245AJ datasheet, SNJ54LVCH245AJ pinout, SNJ54LVCH245AJ application, or SNJ54LVCH245AJ equivalent, key selection criteria include its MIL-PRF-38535 qualification, Ioff hot-insertion support, latch-up immunity >500 mA, JESD 22 ESD robustness (2000-V HBM), and compatibility with legacy 5-V TTL systems while operating from 2.7–3.6 V.
Technical Context
This device implements asynchronous bidirectional bus translation using a direction-control (DIR) input to select A→B or B→A data flow, and an output-enable (OE) input to place all outputs in high-impedance isolation. Its ABT logic family ensures TTL-compatible thresholds (VIL = 0.8 V, VIH = 2.0 V) while maintaining 3.3-V core operation.
Active bus-hold circuitry maintains valid logic states on floating A/B inputs without external components, and Ioff protection prevents backflow current during power-down. The design meets MIL-STD-883 requirements for temperature cycling, mechanical shock, and steady-state reliability across the full −55°C to +125°C range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Enables stable operation from unregulated batteries down to 2.7 V without brownout reset circuits. |
| Input Voltage Range | −0.5 V to 7 V - Supports 5-V TTL-level signals directly into 3.3-V logic, eliminating level-shifters in mixed-voltage systems. |
| Output Drive (IOL) | 48 mA per channel at VCC = 2.7 V - Sustains robust low-state drive into heavy capacitive loads or terminated buses. |
| Propagation Delay | 0.7–4.2 ns (tPLH/tPHL) - Ensures sub-5 ns timing for high-speed bus arbitration in real-time control subsystems. |
| Bus-Hold Current | ±750 μA (dynamic hold) - Actively clamps unused data lines to valid logic levels, preventing metastability in sparse-bus configurations. |
| Latch-Up Immunity | >500 mA per JESD 17 - Guarantees fault tolerance against transient overcurrent events in harsh industrial or aerospace environments. |
| ESD Protection | 2000-V HBM, 200-V MM per JESD 22 - Provides system-level ESD resilience without requiring external TVS diodes on data lines. |
Pinout & Package
SNJ54LVCH245AJ is supplied in a hermetically sealed 20-pin Ceramic Dual-In-Line Package (CDIP-J), rated for −55°C to +125°C operation and compliant with MIL-PRF-38535 Class B screening.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Data Inputs/Outputs | Bidirectional A-side bus interface; internally connected to transceiver core with bus-hold and 3-state control. |
| 11, 12, 13, 14, 15, 16, 17, 18 | B1–B8 Data Inputs/Outputs | Bidirectional B-side bus interface; electrically isolated from A side except during active data transfer. |
| 9 | DIR (Direction Control) | Logic-level input determining data flow direction: DIR = L → B-to-A; DIR = H → A-to-B. |
| 10 | OE (Output Enable) | Active-low control enabling/disabling all outputs; tied to VCC via pullup for safe power-up isolation. |
| 20 | VCC | 3.3-V supply input; must be decoupled locally to suppress ground bounce (<0.8 V typical). |
| 19 | GND | Signal reference plane; separate ground path required to minimize noise coupling into sensitive bus lines. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-Mode Signal Operation | Accepts 5-V TTL inputs and drives 5-V loads while powered from 3.3-V VCC, enabling seamless interface between legacy and modern voltage domains. |
| Hot-Insertion Support | Ioff and power-up 3-state circuitry prevent damaging current backflow and bus contention during live board insertion or removal. |
| Integrated Bus-Hold | Eliminates need for 10-kΩ external pullup/pulldown resistors on A/B data lines, reducing BOM count and PCB area in space-constrained designs. |
| MIL-PRF-38535 Qualification | Fully tested per military specification including temperature cycling, burn-in, and parametric screening-no test omissions per production data sheet. |
| Robust ESD/Latch-Up | 2000-V HBM ESD rating and >500 mA latch-up immunity ensure field reliability in high-noise avionics, radar, and defense electronics. |
Applications
| Avionics Data Bus Interface | Tactical Radios with Legacy Backplanes |
|---|---|
Use Scenario: Interfacing a modern 3.3-V FPGA-based signal processor to a legacy 5-V MIL-STD-1553B or ARINC 429 backplane. IC Role / Device Role / Timing Role: Bidirectional voltage-level translator and bus isolator, synchronizing data flow under DIR/OE control with sub-5 ns propagation delay. Use Value: Enables drop-in replacement of obsolete 5-V transceivers without redesigning power or logic-level infrastructure. |
Use Scenario: Integrating new 3.3-V encryption modules into existing 5-V radio chassis with shared data/address buses. IC Role / Device Role / Timing Role: Hot-pluggable bus transceiver providing electrical isolation and direction control during module insertion/removal. Use Value: Prevents bus contention and backdrive damage during field maintenance, supported by Ioff and power-up 3-state. |
| Spacecraft Onboard Computer I/O | Ground-Based Radar Signal Processing |
Use Scenario: Routing sensor telemetry between radiation-hardened 3.3-V processors and 5-V analog front-end subsystems in LEO satellites. IC Role / Device Role / Timing Role: Radiation-tolerant bus bridge with bus-hold stabilization for infrequent but critical command/data transfers. Use Value: Maintains deterministic logic states on floating inputs during single-event upsets, avoiding spurious bus activity. |
Use Scenario: Connecting high-speed ADC/DAC interfaces (5-V) to 3.3-V DSPs in phased-array radar beamforming units. IC Role / Device Role / Timing Role: Low-jitter, high-drive transceiver supporting burst-mode data bursts up to 100 Mbps. Use Value: Delivers 48 mA sink current and <0.8 V ground bounce to preserve signal integrity in multi-GHz sampling environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54LVTH245AJ | Same ABT architecture, identical pinout and DC specs, but lacks bus-hold circuitry on data inputs. | Requires external 10-kΩ pullup/pulldown resistors on all A/B lines to prevent floating inputs. | Select when bus-hold is unnecessary and legacy compatibility with non-bus-hold variants is required. |
| SN74LVCH245ADW | Commercial-grade (−40°C to +85°C), SOIC-20 package, same electrical specs but no MIL-PRF-38535 screening. | Not qualified for military/aerospace use; unsuitable for extended temperature or high-reliability deployments. | Choose for cost-sensitive industrial or telecom applications where extended temperature range is not required. |
Compared with SNJ54LVCH245AJ, SNJ54LVTH245AJ requires external biasing for floating inputs and lacks bus-hold, while SN74LVCH245ADW offers identical functionality at commercial temperature grade and lower cost-but without military screening or extended thermal performance.
Availability
SNJ54LVCH245AJ is available at Aetrix Electronics and suitable for avionics data bus interface, tactical radio backplane integration, spacecraft onboard computer I/O, and ground-based radar signal processing requiring stable component supply across extended temperature ranges and long lifecycle commitments.
Supply support for SNJ54LVCH245AJ 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 for industrial, automotive, and aerospace markets.
SNJ54LVCH245AJ belongs to TI's military ABT logic family, engineered specifically for high-integrity bidirectional bus translation in mission-critical systems operating across −55°C to +125°C with guaranteed parametric performance and MIL-PRF-38535 compliance.
FAQ
What is the operating temperature range for SNJ54LVCH245AJ?
SNJ54LVCH245AJ is rated for −55°C to +125°C free-air operating temperature, fully screened per MIL-PRF-38535 Class B requirements. This range is validated across all electrical parameters including propagation delay, output drive, and bus-hold functionality-making it suitable for extreme-environment applications such as missile guidance systems and satellite payloads where thermal cycling reliability is mandatory. The SNJ54LVCH245AJ datasheet specifies no derating within this span.
Does SNJ54LVCH245AJ support hot insertion?
Yes, SNJ54LVCH245AJ supports hot insertion via dual protection mechanisms: Ioff circuitry disables outputs when VCC = 0 V to prevent backflow current, and power-up 3-state ensures all outputs remain in high-impedance until VCC stabilizes. These features are production-tested per MIL-STD-883 Method 3015.8 and enable safe field replacement in deployed radar or communication systems without powering down adjacent modules. The SNJ54LVCH245AJ implementation exceeds standard hot-swap requirements.
How does the bus-hold feature work on SNJ54LVCH245AJ?
The bus-hold circuitry on SNJ54LVCH245AJ actively maintains the last-valid logic state on any unused A or B data input using ±750 μA dynamic feedback current-eliminating the need for external pullup or pulldown resistors. This function operates independently of DIR and OE controls and remains active even during power-down transitions. For SNJ54LVCH245AJ, bus-hold is integrated on all 16 data terminals (A1–A8, B1–B8), verified across the full −55°C to +125°C range per TI's SCBS130T datasheet.
What packaging and lead finish does SNJ54LVCH245AJ use?
SNJ54LVCH245AJ is supplied in a 20-pin Ceramic Dual-In-Line Package (CDIP-J) with tin-lead (SnPb) lead finish, compliant with MIL-PRF-38535 mechanical and environmental standards. The package features hermetic sealing, glass-to-metal leads, and is rated for 1000+ hours of unbiased HAST testing. No MSL rating applies due to its ceramic construction, and reflow is not applicable-only wave or hand soldering per MIL-STD-202 Method 210 is permitted for SNJ54LVCH245AJ.
Can SNJ54LVCH245AJ interface directly with 5-V TTL logic?
Yes, SNJ54LVCH245AJ accepts 5-V TTL input voltages (VI up to 7 V) and drives 5-V loads while operating from a 3.3-V VCC, enabling direct connection to legacy 5-V systems without external level shifters. Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) match standard TTL specifications, and output VOH/VOL values meet 5-V logic-high/low requirements under load. This mixed-mode capability is explicitly characterized and guaranteed for SNJ54LVCH245AJ across its full temperature range.
SNJ54LVCH245AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54LVC
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SNJ54LVCH245AJ FAQ
1.How can I place an order for SNJ54LVCH245AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LVCH245AJ 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 SNJ54LVCH245AJ reliable?
The price and inventory of SNJ54LVCH245AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LVCH245AJ is usually 5 days.
3.What payment methods are accepted for SNJ54LVCH245AJ?
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4.How is shipping managed for SNJ54LVCH245AJ?
SNJ54LVCH245AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54LVCH245AJ 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 SNJ54LVCH245AJ?
For technical support, including SNJ54LVCH245AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LVCH245AJ requirements.
6.How does Aetrix verify that SNJ54LVCH245AJ is sourced from the original manufacturer or authorized distributors?
All SNJ54LVCH245AJ 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 SNJ54LVCH245AJ meets industry standards.
7.What is the process for return or replacement of SNJ54LVCH245AJ?
All SNJ54LVCH245AJ units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LVCH245AJ, 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 SNJ54LVCH245AJ part is unused and in its original packaging.
Return procedure for SNJ54LVCH245AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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