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Texas Instruments SN54BCT126AJ
- Part No.:
- SN54BCT126AJ
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN54BCT126AJ.pdf
- Description:
- 54BCT126A QUADRUPLE BUS BUFFER G
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Product details
Overview
SN54BCT126AJ from Texas Instruments is a military-grade quadruple bus buffer gate with 3-state outputs, fabricated in BiCMOS technology. It operates across –55°C to 125°C, delivers 48 mA low-level output drive at 5 V, features 3.6 ns typical tPLH propagation delay, and supports bus line isolation via independent OE-controlled tri-state outputs in ceramic dual-in-line (CDIP) package.
For engineers reviewing the SN54BCT126AJ datasheet, SN54BCT126AJ pinout, SN54BCT126AJ application, or SN54BCT126AJ equivalent, key selection considerations include its military temperature rating, 3-state bus driving capability, BiCMOS power efficiency (ICCZ ≤ 10 mA), and compatibility with legacy TTL/CMOS memory address buffering systems.
Technical Context
The SN54BCT126AJ implements four independent non-inverting buffers, each with dedicated output-enable (OE) control enabling per-channel bus contention prevention. Its BiCMOS architecture combines bipolar input stages for TTL-compatible thresholds (VIH = 2 V, VIL = 0.8 V) and CMOS output stages for low ICCZ quiescent current (5–10 mA).
Each channel exhibits defined switching behavior: tPLH/tPHL ≤ 6.9 ns at VCC = 4.5–5.5 V and CL = 50 pF; output disable timing (tPZL/tPHZ) ranges 7.2–12.3 ns; and absolute maximum ratings include VI/O up to 7 V and output sink current up to 96 mA - all validated for sustained operation under full military environmental stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V logic rails and tolerance against supply ripple. |
| Operating Temp | –55°C to 125°C - qualified for aerospace, defense, and harsh-environment embedded control systems. |
| IOL / IOH | 96 mA sink / –12 mA source - drives heavy capacitive bus loads without external buffering. |
| tPLH / tPHL | ≤ 6.9 ns - enables synchronization in high-speed address/data multiplexing up to ~145 MHz system clock domains. |
| ICCZ | ≤ 10 mA - reduces standby power in multi-buffered backplane architectures versus bipolar-only alternatives. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - matches standard TTL logic families for seamless interface with legacy controllers. |
| ESD Rating | > 2000 V HBM - meets MIL-STD-883C Method 3015 for handling robustness in production and field maintenance. |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), 14-pin, hermetically sealed with glass-frit lid per MIL-STD-1835 GDIP1-T14; 5.08 mm max height; pin 1 identified by optional index mark on cap.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output Enable (OE) | Active-high enable per buffer; low forces high-impedance output state to prevent bus contention. |
| 2, 5, 11, 14 | Input (A) | Non-inverting data input; TTL-compatible thresholds ensure reliable latching from legacy controllers. |
| 3, 6, 12, 9 | Output (Y) | 3-state buffered output; capable of sinking 96 mA while maintaining VOL ≤ 0.55 V at full load. |
| 7 | GND | Signal reference and return path for all I/O and internal logic; requires low-inductance grounding for noise immunity. |
| 14 | VCC | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required within 1 cm for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| State-of-the-art BiCMOS design | Reduces ICCZ to ≤10 mA - cuts standby power by >50% vs. equivalent bipolar TTL buffers in multi-channel systems. |
| Independent 3-state control per channel | Enables selective bus arbitration without gating logic - simplifies PCB routing in memory address/data separation. |
| MIL-STD-883C ESD protection | Exceeds 2000 V HBM - eliminates need for external TVS diodes in field-replaceable modules and avionics LRUs. |
| Full military temperature characterization | Validated operation from –55°C to 125°C - supports deployment in engine-mounted ECUs and satellite payload interfaces. |
| TTL-compatible input thresholds | VIH = 2 V, VIL = 0.8 V - interoperates directly with 74LS, 74ALS, and microcontroller GPIO without level-shifting. |
Applications
| Aerospace Data Bus Interface | Military Vehicle Control Unit |
|---|---|
Use Scenario: Isolating CPU address lines from shared memory bus in flight computer backplanes. IC Role / Device Role / Timing Role: Quad non-inverting buffer with per-line OE control prevents address glitches during DMA transfers. Use Value: 6.9 ns max propagation delay ensures setup/hold timing margins for 16-bit address latches operating at 10 MHz. | Use Scenario: Buffering sensor input signals and actuator command lines in armored vehicle engine control modules. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface between microcontroller I/O and ruggedized CAN/RS-485 transceivers. Use Value: –55°C to 125°C rating and 2000 V ESD withstand eliminate thermal derating and field failure in desert/winter deployments. |
| Secure Communications Crypto Module | Radar Signal Processing Subsystem |
Use Scenario: Enabling/disabling cryptographic key registers during secure boot and runtime reconfiguration sequences. IC Role / Device Role / Timing Role: 3-state gate controlling physical access to volatile key storage locations on FPGA configuration bus. Use Value: Independent OE pins allow atomic key register isolation - preventing side-channel leakage during context switches. | Use Scenario: Driving high-capacitance analog-to-digital converter (ADC) sample-and-hold control lines in phased-array radar front ends. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer synchronizing ADC start pulses across 16-channel receive paths. Use Value: 96 mA sink current maintains clean 0.55 V VOL under 100 pF load - ensuring sub-nanosecond jitter in sampling edge transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54BCT126AJ | Identical electrical specs and pinout; differs only in TI's internal part numbering convention and device marking format. | No functional difference; both meet identical MIL-PRF-38535 Class B requirements and share same qualification test flow. | Select SN54BCT126AJ for standard procurement channels; SNJ54BCT126AJ may be available through legacy defense logistics pipelines. |
| 5962-9088901MCA | MIL-PRF-38535 certified QML-38535 Class V device; identical CDIP-14 package, same pinout, and fully compatible timing/electrical specs. | Required for programs mandating QML-V certification; includes extended reliability testing (e.g., burn-in, radiation hardness screening). | Choose 5962-9088901MCA when compliance with DoD acquisition directives (e.g., DFARS 252.246-7001) is contractually enforced. |
Compared with SNJ54BCT126AJ and 5962-9088901MCA, the SN54BCT126AJ provides identical core functionality and military temperature range but serves as the baseline qualified part for general-purpose defense applications where QML-V certification is not mandated - offering streamlined sourcing and lifecycle management.
Availability
SN54BCT126AJ is available at Aetrix Electronics and suitable for aerospace data bus interface, military vehicle control unit, and secure communications crypto module applications requiring stable component supply across extended product lifecycles.
Supply support for SN54BCT126AJ 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and defense markets.
The SN54BCT126AJ belongs to TI's military-qualified BCT logic family, designed specifically for high-speed, low-power bus interfacing in mission-critical systems where environmental resilience and long-term component stability are mandatory.
FAQ
What is the maximum operating temperature range specified for the SN54BCT126AJ?
The SN54BCT126AJ is characterized for continuous operation from –55°C to 125°C, meeting full military temperature specifications per MIL-STD-883. This range is validated across all electrical parameters including propagation delay, output drive, and input thresholds - making SN54BCT126AJ suitable for engine bay, avionics, and space-qualified applications where thermal cycling exceeds commercial limits.
Does the SN54BCT126AJ support true 5 V TTL-compatible input levels?
Yes, the SN54BCT126AJ guarantees VIH = 2 V minimum and VIL = 0.8 V maximum at VCC = 4.5–5.5 V, fully compliant with standard TTL logic thresholds. This allows direct connection to legacy 74LS, 74ALS, and microcontroller GPIO without level translation - a key requirement confirmed in the device's recommended operating conditions table and function table.
What package type is used for the SN54BCT126AJ, and is it hermetically sealed?
The SN54BCT126AJ uses a ceramic dual-in-line package (CDIP) with 14 pins, designated "J" package per TI documentation. It is hermetically sealed using a ceramic lid and glass-frit bonding per MIL-STD-1835 GDIP1-T14, providing moisture resistance and long-term reliability in high-humidity or vacuum environments - critical for aerospace and defense deployments.
Can the SN54BCT126AJ drive a 50 pF bus load with guaranteed timing?
Yes, the SN54BCT126AJ specifies switching characteristics at CL = 50 pF with R1/R2 = 500 Ω, delivering tPLH ≤ 4.9 ns and tPHL ≤ 6.9 ns at VCC = 5 V and TA = 25°C. These values are maintained across the full military temperature range, ensuring deterministic timing for memory address latching and synchronous bus arbitration in real-time control systems.
Is the SN54BCT126AJ pin-compatible with commercial-grade SN74BCT126A devices?
No - while both share identical logic function and pin numbering, the SN54BCT126AJ (CDIP-J) and SN74BCT126A (PDIP-N or SOIC-D) use different package footprints and thermal/moisture sealing methods. The J-package has distinct mechanical dimensions, lead finish, and hermetic construction; PCB layout must be specific to CDIP-14, not reused from DIP-14 or SOIC-14 designs.
SN54BCT126AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- 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:
- -
SN54BCT126AJ FAQ
1.How can I place an order for SN54BCT126AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54BCT126AJ 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 SN54BCT126AJ reliable?
The price and inventory of SN54BCT126AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54BCT126AJ is usually 5 days.
3.What payment methods are accepted for SN54BCT126AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54BCT126AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54BCT126AJ?
SN54BCT126AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54BCT126AJ 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 SN54BCT126AJ?
For technical support, including SN54BCT126AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54BCT126AJ requirements.
6.How does Aetrix verify that SN54BCT126AJ is sourced from the original manufacturer or authorized distributors?
All SN54BCT126AJ 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 SN54BCT126AJ meets industry standards.
7.What is the process for return or replacement of SN54BCT126AJ?
All SN54BCT126AJ units undergo pre-shipment inspection (PSI). If there is an issue with SN54BCT126AJ, 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 SN54BCT126AJ part is unused and in its original packaging.
Return procedure for SN54BCT126AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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