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Texas Instruments SNJ54ABT125FK
- Part No.:
- SNJ54ABT125FK
- Manufacturer:
- Texas Instruments
- Package:
- 20-CLCC
- Datasheet:
-
SNJ54ABT125FK.pdf
- Description:
- MILITARY 4-CH, 4.5-V TO 5.5-V BU
- Quantity:
- Payment:
- Shipping:
Inventory:4,293
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Product details
Overview
SNJ54ABT125FK from Texas Instruments is a military-grade quadruple bus buffer gate with 3-state outputs, designed for high-reliability aerospace and defense systems operating from −55°C to 125°C. It delivers −32-mA high-drive IOH and 64-mA IOL output capability, supports hot insertion via Ioff and power-up 3-state logic, and features <1-V output ground bounce (VOLP) at 5 V and 25°C.
For engineers reviewing the SNJ54ABT125FK datasheet, SNJ54ABT125FK pinout, SNJ54ABT125FK application, or SNJ54ABT125FK equivalent, key selection criteria include its LCCC-20 ceramic package, MIL-PRF-38535 qualification, latch-up immunity (>500 mA), and compatibility with 5-V TTL/CMOS bus interfaces in harsh-environment digital subsystems.
Technical Context
The SNJ54ABT125FK implements four independent noninverting buffers, each controlled by a dedicated output-enable (OE) input that places the Y output in high-impedance state when high. Its Ioff circuitry actively disables outputs during power-down to prevent backflow current, while power-up 3-state ensures outputs remain tri-stated during VCC ramp-up/down.
This device adheres to strict military electrical specifications: VIH = 2 V min, VIL = 0.8 V max, VOH = 2 V min at −32 mA, VOL = 0.55 V max at 64 mA, and propagation delays as low as 1 ns (tPLH/tPHL typ) under 5-V operation - all verified across −55°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL logic rails and immune to marginal supply droop |
| Output Drive | −32 mA IOH / 64 mA IOL - enables direct driving of heavy capacitive loads or multiple downstream inputs without external buffering |
| Propagation Delay | 1 ns min / 4.9 ns max (tPLH, tPHL @ 5 V) - supports high-speed data transfer in synchronous bus architectures |
| Hot-Insertion Support | Ioff and power-up 3-state - eliminates signal contention and backfeed damage during live board replacement in avionics backplanes |
| Latch-Up Immunity | >500 mA per JEDEC JESD17 - ensures robust operation in radiation-prone or ESD-intensive environments |
| Operating Temperature | −55°C to 125°C - qualified for extended-range military platforms including missile guidance and satellite payload electronics |
Pinout & Package
LCCC (Leadless Ceramic Chip Carrier) package with 20 terminals, hermetically sealed, 8.89 mm × 8.89 mm footprint, 1.27 mm pitch, and 2.03 mm maximum height - optimized for high-reliability PCB mounting with thermal stability and moisture resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 10, 11, 12, 13 | Input/Output Signal Pins | Correspond to 1A/1Y, 2A/2Y, 3A/3Y, 4A/4Y pairs - noninverting buffer paths with dedicated OE control per channel |
| 7, 8 | GND / VCC | Power return and supply pins - placed adjacent for low-inductance decoupling in high-speed layout |
| 9, 14, 15, 16 | OE Inputs | Independent 3-state enable controls (1OE–4OE) - active-low logic; high = high-Z output |
| 17–20 | No Connect (NC) | Internally unconnected terminals - must be left floating or tied to GND per design guidelines to avoid noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | −32 mA IOH / 64 mA IOL enables fan-out to ≥10 standard TTL loads without degradation in edge rate or voltage margin |
| Hot-Insertion Ready | Ioff + power-up 3-state eliminates need for external isolation circuitry in modular avionics chassis |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C reduces simultaneous switching noise in dense digital backplanes |
| MIL-PRF-38535 Qualified | Fully tested per military screening including burn-in, temperature cycling, and lot acceptance testing for Class B or S devices |
| ESD Robustness | 2000-V HBM / 200-V MM rating protects against handling damage in field maintenance and depot repair |
Applications
| Avionics Data Bus Interface | Military Radar Signal Conditioning |
|---|---|
Use Scenario: Isolating and buffering ARINC 429 or MIL-STD-1553B bus drivers in flight control computers. IC Role / Device Role / Timing Role: Quad noninverting buffer with per-channel 3-state control manages bidirectional data flow between processor and transceiver ICs. Use Value: Prevents bus contention during processor reset sequences and ensures clean signal integrity across wide temperature ranges. | Use Scenario: Driving high-capacitance analog-to-digital converter (ADC) control lines in phased-array radar front-ends. IC Role / Device Role / Timing Role: Level-shifting and current-boosting interface between FPGA I/O banks and ADC parallel bus inputs. Use Value: Maintains sub-nanosecond timing margins under thermal stress and suppresses ground bounce-induced sampling errors. |
| Satellite Onboard Computer Backplane | Tactical Vehicle Communication Module |
Use Scenario: Interfacing radiation-hardened microprocessors with memory and peripheral modules on spacecraft mainframes. IC Role / Device Role / Timing Role: Hot-pluggable bus repeater enabling module replacement without system shutdown. Use Value: Ioff protection prevents power rail collapse during card extraction; LCCC package withstands launch vibration and vacuum outgassing. | Use Scenario: Buffering command-and-control signals between vehicle ECUs and encrypted radio transceivers in armored vehicles. IC Role / Device Role / Timing Role: Isolation gate for secure data path routing with deterministic enable/disable timing. Use Value: Guaranteed 3-state behavior during cold-start power sequencing avoids spurious radio activation or false fault reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ABT244FK | Octal (8-channel) noninverting buffer, same LCCC-20 package, identical temp range and drive strength | Higher channel count suits wider data buses (e.g., 16-bit memory interfaces); larger die area increases propagation delay slightly | Select when expanding bus width beyond 4 bits without changing board layout or thermal profile |
| SNJ54ABT240FK | Octal inverting buffer, same LCCC-20 package, identical temp range and drive specs | Provides polarity inversion required in legacy bus architectures (e.g., IEEE 1149.1 JTAG TDO path conditioning) | Choose only when signal inversion is explicitly needed in the data path; otherwise, SNJ54ABT125FK offers lower latency |
Compared with SNJ54ABT244FK and SNJ54ABT240FK, the SNJ54ABT125FK provides optimal channel density for 4-bit control bus isolation, minimizes propagation delay variance across channels, and simplifies timing closure in space-constrained military PCBs where octal variants introduce unnecessary routing complexity.
Availability
SNJ54ABT125FK is available at Aetrix Electronics and suitable for avionics data bus interface, military radar signal conditioning, and satellite onboard computer backplane applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54ABT125FK 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 defense markets.
The SNJ54ABT125FK belongs to TI's military logic family, engineered specifically for ruggedized digital interfacing in mission-critical systems where performance consistency under extreme environmental stress is non-negotiable.
FAQ
What is the operating temperature range for SNJ54ABT125FK?
The SNJ54ABT125FK is rated for operation from −55°C to 125°C, meeting MIL-PRF-38535 requirements for high-reliability military and aerospace applications. This extended range is validated through full temperature cycling and parametric testing across the entire specification envelope, ensuring consistent 3-state behavior and output drive capability at both extremes.
Does SNJ54ABT125FK support hot insertion, and how is it implemented?
Yes, SNJ54ABT125FK supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V to block damaging backflow current, and power-up 3-state holds outputs in high-impedance during VCC ramp-up/down. These functions are inherent to the silicon design and require no external components - confirmed in TI's SCBS182I datasheet Section 1.
What package type and pin count does SNJ54ABT125FK use?
SNJ54ABT125FK uses a 20-terminal Leadless Ceramic Chip Carrier (LCCC-FK) package measuring 8.89 mm × 8.89 mm with 1.27 mm pitch. Pinout includes four independent A/Y buffer pairs, four OE inputs, one VCC, one GND, and four NC terminals - fully documented in the "SN54ABT125 . . . FK PACKAGE (TOP VIEW)" diagram on page 1 of the datasheet.
How does SNJ54ABT125FK handle ground bounce, and what is the measured value?
SNJ54ABT125FK limits output ground bounce (VOLP) to <1 V under worst-case conditions: VCC = 5 V, TA = 25°C, and high-current switching. This is achieved through optimized output stage layout and internal grounding architecture, directly specified in the "Typical VOLP (Output Ground Bounce)" parameter on page 1 of the SCBS182I datasheet.
Is SNJ54ABT125FK compliant with JEDEC latch-up and ESD standards?
Yes, SNJ54ABT125FK exceeds JEDEC Standard JESD17 for latch-up immunity (>500 mA) and meets JESD22 for ESD protection: 2000-V Human-Body Model (A114-A) and 200-V Machine Model (A115-A). These ratings are guaranteed for every unit in production lots and appear in the "Features" section of the official TI datasheet.
SNJ54ABT125FK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54ABT
- Package/Case:
- 20-CLCC
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LCCC (8.89x8.89)
SNJ54ABT125FK FAQ
1.How can I place an order for SNJ54ABT125FK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ABT125FK 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 SNJ54ABT125FK reliable?
The price and inventory of SNJ54ABT125FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ABT125FK is usually 5 days.
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SNJ54ABT125FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ABT125FK 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 SNJ54ABT125FK?
For technical support, including SNJ54ABT125FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ABT125FK requirements.
6.How does Aetrix verify that SNJ54ABT125FK is sourced from the original manufacturer or authorized distributors?
All SNJ54ABT125FK 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 SNJ54ABT125FK meets industry standards.
7.What is the process for return or replacement of SNJ54ABT125FK?
All SNJ54ABT125FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ABT125FK, 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 SNJ54ABT125FK part is unused and in its original packaging.
Return procedure for SNJ54ABT125FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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