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Texas Instruments SNJ54AHC126J
- Part No.:
- SNJ54AHC126J
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SNJ54AHC126J.pdf
- Description:
- BUS DRIVER, AHC/VHC/H/U/V SERIES
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Product details
Overview
SNJ54AHC126J from Texas Instruments is a military-grade quadruple bus buffer gate with independent 3-state outputs, operating across –55°C to 125°C. It features 2-V to 5.5-V VCC supply range, ±25 mA output drive, 5.5 ns typical propagation delay (VCC = 5 V, CL = 15 pF), and JESD 17 latch-up immunity >250 mA - used in avionics data bus isolation and high-reliability system-level signal routing.
For engineers reviewing the SNJ54AHC126J datasheet, SNJ54AHC126J pinout, SNJ54AHC126J application, or SNJ54AHC126J equivalent, this page delivers verified electrical specs, CDIP-14 package details, MIL-PRF-38535 compliance context, and real-world design constraints including OE pulldown requirements and unused-input termination guidance.
Technical Context
The SNJ54AHC126J implements four independent noninverting buffers, each with dedicated active-high output-enable (OE) control. Its CMOS AHC logic family ensures rail-to-rail output swing, low static current (ICC ≤ 40 µA at VCC = 5.5 V), and noise margins exceeding 30% of VCC across temperature.
Each channel operates with matched tPLH/tPHL (≤6.5 ns at VCC = 5 V, CL = 15 pF) and fast 3-state enable/disable timing (tPZH/tPZL ≤6 ns, tPHZ/tPLZ ≤8 ns). Input transition rate tolerance is 20 ns/V at 5 V, supporting clean edge handling in mixed-signal backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports dual-supply systems and legacy 5-V TTL interfacing without level shifters |
| Operating Temperature | –55°C to 125°C - qualified per MIL-PRF-38535 for aerospace and defense platforms |
| tPD (A→Y) | 3.8 ns (min) to 6.5 ns (max) at VCC = 5 V, CL = 15 pF - enables <100-MHz bus clocking with margin |
| IOH/IOL | –8 mA / +8 mA at VCC = 5 V - drives 10+ LVTTL loads or 20+ CMOS inputs directly |
| Input Thresholds | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - ensures robust noise immunity (>1.3 V low-state margin) |
| 3-State Leakage | IOZ ≤ ±2.5 µA at VCC = 5.5 V - prevents bus contention during power sequencing |
| Power Dissipation | Cpd = 14 pF - predicts dynamic power as PD ≈ Cpd × VCC² × f at 1 MHz |
Pinout & Package
SNJ54AHC126J uses a 14-pin Ceramic Dual In-line Package (CDIP-J) with 0.3-inch body width, compliant with MIL-STD-1835. Pin 1 is top-left corner, with notch orientation marking pin 1 location. Package thermal resistance θJA is not specified for CDIP-J but exceeds plastic variants due to ceramic substrate.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE1–OE4 | Active-high output-enable controls; must be pulled low via resistor during power-up to guarantee high-Z state |
| 2, 5, 9, 12 | A1–A4 | Noninverting data inputs; all unused inputs require tie to VCC or GND per SCBA004 |
| 3, 6, 8, 11 | Y1–Y4 | 3-state buffered outputs; high-impedance when corresponding OE is low |
| 7 | GND | Signal ground reference; decoupling capacitor required within 10 mm of pin |
| 14 | VCC | Positive supply; bypassed with 0.1 µF ceramic capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple independent buffers | Enables isolated control of four bidirectional data paths without cross-talk or shared enable timing skew |
| MIL-PRF-38535 qualification | Guarantees full parameter testing over –55°C to 125°C, including latch-up immunity ≥250 mA per JESD 17 |
| 3-state output architecture | Allows time-multiplexed bus sharing; output leakage <2.5 µA prevents false logic states on floating lines |
| Wide VCC range (2–5.5 V) | Permits direct interface between 3.3-V microcontrollers and 5-V peripherals without external level translation |
| Low input capacitance (Ci = 10 pF) | Minimizes loading on upstream drivers, preserving signal integrity in high-speed parallel buses |
Applications
| Avionics Data Bus Isolation | Secure Test Equipment Interface |
|---|---|
|
Use Scenario: Isolating ARINC 429 transmitter/receiver lines in flight control computers during self-test sequences. IC Role / Device Role / Timing Role: SNJ54AHC126J acts as a controlled signal gate, enabling/disabling data flow between processor and transceiver under software command. Use Value: Prevents bus contention during reset; its –55°C to 125°C rating ensures operation across cabin pressurization cycles and external sensor environments. |
Use Scenario: Routing calibration signals between FPGA-based pattern generators and DUTs in automated test equipment. IC Role / Device Role / Timing Role: SNJ54AHC126J provides glitch-free signal pass-through with sub-7-ns propagation, synchronized to test clock edges. Use Value: Enables precise timing alignment across four independent channels, critical for multi-pin parametric testing accuracy. |
| Ruggedized Industrial PLC Backplane | Military Vehicle CAN Gateway Buffering |
|
Use Scenario: Level-shifting and isolating I/O modules on a 24-V PLC backplane where field-side logic runs at 5 V. IC Role / Device Role / Timing Role: SNJ54AHC126J serves as a fault-tolerant bus driver, with OE pins tied to watchdog-controlled GPIOs for fail-safe shutdown. Use Value: ±25 mA drive strength sustains signal integrity over 30-cm ribbon cable runs; ceramic package resists vibration-induced solder fatigue. |
Use Scenario: Buffering CAN_H/CAN_L arbitration signals between multiple controller nodes in armored vehicle communication networks. IC Role / Device Role / Timing Role: SNJ54AHC126J isolates CAN controller outputs during firmware updates, preventing network disruption. Use Value: High-impedance state eliminates bus loading during reconfiguration; latch-up immunity protects against ESD events in vehicle EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ACT126J | TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V); higher ICC (160 µA max) | Better suited for legacy 5-V TTL systems; less noise margin in mixed-voltage designs | Select when interfacing with older 74LS/74F logic; avoid if low power or wide VCC range is required |
| SNJ54AHCT126J | TTL-input compatible (VIL ≤ 0.8 V, VIH ≥ 2.0 V) with AHC output drive; 5-V only operation | Enables drop-in replacement for 74LS126 in 5-V-only systems without redesigning input biasing | Choose for seamless migration from bipolar logic; not suitable for 3.3-V operation or extended temperature margin |
Compared with SNJ54ACT126J and SNJ54AHCT126J, the SNJ54AHC126J offers superior voltage flexibility (2–5.5 V), lower static power, and wider industrial temperature coverage - making it optimal for new designs requiring mixed-supply compatibility and MIL-grade reliability.
Availability
SNJ54AHC126J is available at Aetrix Electronics and suitable for avionics data bus isolation, secure test equipment interface, ruggedized industrial PLC backplane, and military vehicle CAN gateway buffering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54AHC126J 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 heritage.
The SNJ54AHC126J belongs to TI's military logic portfolio, designed specifically for high-reliability signal routing in space-constrained, thermally aggressive environments where latch-up immunity and guaranteed parameter performance are mandatory.
FAQ
What is the maximum operating temperature for SNJ54AHC126J?
The SNJ54AHC126J is rated for continuous operation from –55°C to 125°C ambient temperature, meeting MIL-PRF-38535 Class B requirements. This specification is validated across all electrical parameters in the datasheet, including propagation delay, output drive, and 3-state leakage, with no derating required at the extremes.
Does SNJ54AHC126J support 3.3-V operation?
Yes, SNJ54AHC126J fully supports 3.3-V operation: its VCC range is 2 V to 5.5 V, and all recommended operating conditions - including VIH/VIL thresholds, IOH/IOL drive, and propagation delay - are specified down to 2 V. At VCC = 3.3 V, tPD is 5.6–9.5 ns (CL = 15 pF) and output drive is ±4 mA.
How should unused inputs be handled on SNJ54AHC126J?
All unused inputs on SNJ54AHC126J must be tied to either VCC or GND to prevent floating nodes that cause excessive current draw or oscillation. TI Application Report SCBA004 explicitly mandates this practice for AHC-family devices; leaving inputs unconnected violates recommended operating conditions and risks functional failure.
Is SNJ54AHC126J pin-compatible with commercial SN74AHC126 variants?
Yes, SNJ54AHC126J shares identical pinout and logic function with SN74AHC126 in PDIP-N, SOIC-D, SSOP-DB, and TSSOP-PW packages. However, the CDIP-J package has different mechanical dimensions and thermal characteristics - PCB layout must accommodate 0.3-inch DIP footprint and ceramic package height.
What is the recommended pull-down resistor value for OE pins on SNJ54AHC126J?
Texas Instruments recommends tying OE pins to GND through a pulldown resistor to ensure high-impedance state during power-up. The minimum resistor value depends on the driver's current-sourcing capability; for standard CMOS drivers, 10 kΩ is typical. Values below 1 kΩ may increase static current unnecessarily without improving reliability.
SNJ54AHC126J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SNJ54AHC126J FAQ
1.How can I place an order for SNJ54AHC126J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54AHC126J 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 SNJ54AHC126J reliable?
The price and inventory of SNJ54AHC126J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AHC126J is usually 5 days.
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Once your SNJ54AHC126J 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 SNJ54AHC126J?
For technical support, including SNJ54AHC126J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AHC126J requirements.
6.How does Aetrix verify that SNJ54AHC126J is sourced from the original manufacturer or authorized distributors?
All SNJ54AHC126J 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 SNJ54AHC126J meets industry standards.
7.What is the process for return or replacement of SNJ54AHC126J?
All SNJ54AHC126J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AHC126J, 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 SNJ54AHC126J part is unused and in its original packaging.
Return procedure for SNJ54AHC126J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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