My Inquiry
My Account
Texas Instruments SNJ54AHC245W
- Part No.:
- SNJ54AHC245W
- Manufacturer:
- Texas Instruments
- Package:
- 20-CFlatPack
- Datasheet:
-
SNJ54AHC245W.pdf
- Description:
- OCTAL BUS TRANSCEIVERS WITH 3-ST
- Quantity:
- Payment:
- Shipping:
Inventory:2,746
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SNJ54AHC245 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 from 2 V to 5.5 V, supports –55 °C to +125 °C temperature range, delivers ±8 mA output drive at 5 V, and features direction (DIR) and output-enable (OE) control for isolated bus communication in avionics and defense computing.
For engineers reviewing the SNJ54AHC245 datasheet, SNJ54AHC245 pinout, SNJ54AHC245 application, or SNJ54AHC245 equivalent, key selection criteria include its MIL-PRF-38535 compliance, latch-up immunity (>250 mA), 5.5 V tolerant inputs, 3-state timing parameters (e.g., tPLH = 4 ns @ 5 V), and CFP-20 package compatibility with legacy high-reliability board layouts.
Technical Context
The SNJ54AHC245 implements dual-rail CMOS logic with independent DIR and OE control lines enabling deterministic bus direction selection and high-impedance isolation. Its functional modes-A→B, B→A, and tri-state-are defined by synchronous logic levels on DIR and OE, with no internal clock or timing dependency.
It supports voltage translation from 5 V to 3.3 V systems via overvoltage-tolerant inputs (up to 5.5 V), slow edge-rate design minimizing output ringing, and balanced drive strength optimized for noise-sensitive backplane and inter-board interfaces in harsh-environment electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - Enables operation across legacy 5 V and modern mixed-voltage systems without level shifters. |
| Operating Temperature | –55 °C to +125 °C - Qualified per MIL-PRF-38535 for extended-range military and aerospace applications. |
| Output Drive | ±8 mA @ 5 V - Sufficient to drive standard TTL loads and moderate-capacitance buses without external buffers. |
| Propagation Delay | 4 ns (tPLH/tPHL, CL = 15 pF, VCC = 5 V) - Supports high-speed data handshaking in real-time control subsystems. |
| Input Voltage Tolerance | Up to 5.5 V regardless of VCC - Allows safe interfacing with 5 V peripherals while powered from 3.3 V rails. |
| Latch-up Immunity | >250 mA per JESD17 - Ensures robustness against transient current faults in electrically noisy platforms. |
| 3-State Enable Time | tPZH = 5.8 ns @ 5 V - Fast output disable enables precise bus arbitration and prevents contention during mode switching. |
Pinout & Package
SNJ54AHC245 is supplied in a 20-pin Ceramic Flatpack (CFP) package measuring 13.09 mm × 8.13 mm (body: 13.09 mm × 6.92 mm), with hermetically sealed construction and tin-lead (SNPB) lead finish suitable for high-reliability soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction Control Input | Logic level selects data flow direction: LOW enables B→A, HIGH enables A→B; critical for half-duplex bus arbitration. |
| OE (Pin 19) | Output Enable Input | Active-LOW signal disables all A and B I/Os into high-impedance state; must be pulled up during power-up to prevent bus contention. |
| A1–A8 (Pins 2–9) | Port A I/O Terminals | Bidirectional data lines connected to one bus segment; internally buffered with CMOS drivers and receivers. |
| B1–B8 (Pins 11–18) | Port B I/O Terminals | Bidirectional data lines connected to second bus segment; electrically isolated from Port A when OE is HIGH. |
| GND (Pin 10) | Ground Reference | Primary return path for all I/O and supply currents; requires low-inductance connection to system ground plane. |
| VCC (Pin 20) | Power Supply | Single-supply rail supporting full 2–5.5 V operating range; requires local 0.1 µF bypass capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-38535 Compliance | Full screening and testing per military specification ensures reliability in mission-critical avionics and defense electronics. |
| Overvoltage-Tolerant Inputs | Accepts up to 5.5 V on all I/O pins independent of VCC, enabling seamless 5 V ↔ 3.3 V bus bridging without external translators. |
| Slow Edge-Rate Outputs | Controlled slew rates minimize EMI and signal ringing on long traces or unterminated stubs in backplane architectures. |
| High-Impedance Isolation | Tri-state outputs achieve >10⁹ Ω off-state impedance, preventing leakage current and crosstalk between isolated bus domains. |
| Latch-Up Immunity | Exceeds 250 mA per JESD17, protecting against destructive current injection during ESD events or power sequencing anomalies. |
Applications
| Avionics Data Bus Interface | Defense Radar Signal Processing |
|---|---|
Use Scenario: Interfacing legacy 5 V sensor modules with modern 3.3 V FPGA-based processing units in airborne radar front-ends. IC Role / Device Role / Timing Role: Bidirectional voltage-translating bus transceiver managing command/data exchange between sensor interface ASIC and digital signal processor. Use Value: Eliminates need for discrete level-shifting components while maintaining signal integrity under wide temperature swings and vibration. | Use Scenario: Isolating high-speed ADC data lanes from control logic in phased-array radar beamforming subsystems. IC Role / Device Role / Timing Role: Octal 3-state buffer enabling time-multiplexed access to shared memory banks between analog front-end and digital backend. Use Value: Prevents bus contention during simultaneous read/write operations and supports deterministic latency via sub-5 ns propagation delay. |
| Tactical Communications Backplane | Spacecraft Onboard Computer Interconnect |
Use Scenario: Bridging multiple 5 V communication controller modules (e.g., MIL-STD-1553B interface ICs) across a ruggedized backplane. IC Role / Device Role / Timing Role: Asynchronous bus transceiver providing galvanically isolated data routing between protocol-specific controllers and central host processor. Use Value: Maintains signal fidelity over 15 cm trace lengths and withstands thermal cycling from –55 °C to +125 °C without parameter drift. | Use Scenario: Enabling reconfigurable interconnect between radiation-hardened microprocessors and memory subsystems in satellite payload computers. IC Role / Device Role / Timing Role: Radiation-tolerant octal transceiver facilitating fault-containment zones by isolating failed bus segments during single-event latch-up recovery. Use Value: Leverages MIL-PRF-38535 qualification and >250 mA latch-up immunity to sustain operation after ionizing particle strikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ACT245W | TTL-compatible input thresholds (VIH = 2 V min), higher ICC (40 µA), same CFP-20 package and temp range. | Better suited for legacy TTL-driven systems requiring stricter VIH/VIL margins; less ideal for mixed-voltage CMOS environments. | Select when interfacing with older 5 V TTL logic families where AHC's CMOS thresholds may cause marginal noise margin. |
| SNJ54LS245J | Bipolar TTL technology, lower speed (tPLH = 15 ns), higher power (ICC = 34 mA), CDIP-20 only, –55 °C to +125 °C. | Used in legacy designs where pinout compatibility with existing LS footprints is mandatory and speed/power trade-offs are acceptable. | Choose only for drop-in replacement in proven LS-based hardware; avoid for new designs due to power and noise limitations. |
Compared with SNJ54ACT245W and SNJ54LS245J, SNJ54AHC245W offers superior speed-power efficiency, wider voltage tolerance, and lower static current-making it optimal for modern high-density, low-power military computing where signal integrity and thermal management are critical.
Availability
SNJ54AHC245W is available at Aetrix Electronics and suitable for avionics data bus interface, defense radar signal processing, tactical communications backplane, spacecraft onboard computer interconnect, and other high-reliability applications requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for SNJ54AHC245W 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and aerospace markets.
The SNJ54AHC245W belongs to TI's military-grade logic family, engineered specifically for high-reliability, extended-temperature applications in defense electronics, avionics, and space systems where performance consistency under stress is non-negotiable.
FAQ
What is the maximum operating voltage for SNJ54AHC245W?
The SNJ54AHC245W supports a supply voltage range of 2 V to 5.5 V. Its inputs tolerate up to 5.5 V regardless of VCC level, enabling robust interfacing with 5 V peripherals even when powered from lower rails. This overvoltage capability is confirmed in Section 5.3 Recommended Operating Conditions and Table 5-5 Electrical Characteristics of the official datasheet.
Does SNJ54AHC245W require external pull-up resistors on OE or DIR?
Yes - OE must be tied to VCC through a pull-up resistor during power-up to ensure outputs remain in high-impedance state until controlled. The minimum resistor value depends on the driver's sink capability; TI recommends evaluating based on system-level noise immunity and rise-time requirements. DIR may float only if externally driven, but best practice is to tie unused control inputs to VCC or GND.
Is SNJ54AHC245W compatible with commercial-grade SN74AHC245 packages?
No - SNJ54AHC245W uses a CFP-20 ceramic flatpack package with SNPB finish and MIL-PRF-38535 screening, whereas SN74AHC245 variants use plastic packages (e.g., SOIC, TSSOP, VQFN) with different thermal, mechanical, and reliability profiles. Pin count and basic function align, but PCB layout, soldering profile, and qualification scope are not interchangeable.
What is the latch-up immunity rating for SNJ54AHC245W?
SNJ54AHC245W exceeds 250 mA latch-up immunity per JESD17, as explicitly stated in the Features section of the datasheet. This rating applies across the full operating temperature range and is verified during MIL-PRF-38535 qualification, making it suitable for deployment in electrically noisy or high-transient environments such as radar transmitters and motor drive controls.
Can SNJ54AHC245W translate signals between 5 V and 3.3 V buses?
Yes - SNJ54AHC245W supports true down-translation: its inputs accept voltages up to 5.5 V irrespective of VCC, allowing 5 V signals to safely drive the device when powered from 3.3 V. Outputs swing rail-to-rail (0 V to VCC), so a 3.3 V-powered SNJ54AHC245W drives 3.3 V logic levels onto the B bus while receiving 5 V inputs on the A bus.
SNJ54AHC245W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54AHC
- Package/Case:
- 20-CFlatPack
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-CFP
SNJ54AHC245W FAQ
1.How can I place an order for SNJ54AHC245W through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54AHC245W 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 SNJ54AHC245W reliable?
The price and inventory of SNJ54AHC245W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AHC245W is usually 5 days.
3.What payment methods are accepted for SNJ54AHC245W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54AHC245W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54AHC245W?
SNJ54AHC245W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54AHC245W 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 SNJ54AHC245W?
For technical support, including SNJ54AHC245W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AHC245W requirements.
6.How does Aetrix verify that SNJ54AHC245W is sourced from the original manufacturer or authorized distributors?
All SNJ54AHC245W 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 SNJ54AHC245W meets industry standards.
7.What is the process for return or replacement of SNJ54AHC245W?
All SNJ54AHC245W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AHC245W, 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 SNJ54AHC245W part is unused and in its original packaging.
Return procedure for SNJ54AHC245W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SNJ54AHC245W Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
