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Texas Instruments SNJ54LVTH240J
- Part No.:
- SNJ54LVTH240J
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54LVTH240J.pdf
- Description:
- 54LVTH240 3.3-V ABT OCTAL BUFFER
- Quantity:
- Payment:
- Shipping:
Inventory:4,061
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Product details
Overview
SNJ54LVTH240 from Texas Instruments is a military-grade 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation (5-V inputs/outputs with 3.3-V VCC). It features bus-hold on all data inputs, Ioff and power-up 3-state for hot insertion, and operates across −55°C to 125°C in CDIP (J) package. Used in ruggedized avionics backplane interfaces and high-reliability test equipment.
For engineers reviewing the SNJ54LVTH240 datasheet, SNJ54LVTH240 pinout, SNJ54LVTH240 application, or SNJ54LVTH240 equivalent, key selection criteria include its −55°C to 125°C operating range, 5-V tolerant inputs, bus-hold functionality eliminating external resistors, Ioff-enabled hot-swap capability, and compatibility with TTL-level systems interfacing to 3.3-V logic domains.
Technical Context
The SNJ54LVTH240 implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable (OE) control. Its ABT (Advanced BiCMOS Technology) architecture delivers TTL-compatible drive strength while maintaining 3.3-V core operation.
Bus-hold circuitry actively maintains valid logic states on unused inputs without external biasing, and the Ioff protection disables outputs during power-down to prevent current backflow-critical for live-insertion systems. Power-up 3-state ensures outputs remain high-impedance until VCC stabilizes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V without functional degradation |
| Input Voltage Tolerance | −0.5 V to 7 V - enables direct connection to 5-V TTL buses without level shifters |
| IOL (per output) | 48 mA - drives standard TTL loads with margin at VCC = 3.3 V, TA = 25°C |
| tPLH/tPHL | 0.9–4.7 ns - low propagation delay enables use in high-speed address/data buffering up to ~100 MHz |
| Bus-Hold Current | ±750 μA - provides sufficient overdrive to reliably switch input states under noise or floating conditions |
| ESD Protection | 2000-V HBM, 200-V MM - exceeds JEDEC JESD22-A114/A115 for robust handling in manufacturing and field environments |
| Latch-Up Immunity | >500 mA per JESD17 - prevents destructive latch-up during transient overvoltage events |
Pinout & Package
SNJ54LVTH240 is housed in a 20-pin Ceramic Dual In-line Package (CDIP-J), hermetically sealed for military temperature range (−55°C to 125°C) and high-reliability applications. Package dimensions: 24.2 mm × 6.99 mm × 4.45 mm (length × width × height), 2.54 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output Enable (active-low) | Independent controls for each 4-bit section; must be pulled high via resistor during power-up to ensure safe high-Z state |
| 1A1–1A4, 2A1–2A4 | Data Inputs | Eight buffered inputs with integrated bus-hold; eliminate need for external pullup/pulldown resistors |
| 1Y1–1Y4, 2Y1–2Y4 | 3-State Outputs | Noninverting buffered outputs; enter high-impedance when respective OE is high |
| VCC | Supply | 3.3-V core supply; accepts 2.7–3.6 V range for battery-backed or variable-voltage systems |
| GND | Ground | Signal reference plane; separate from power ground in layout best practice for noise isolation |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V/3.3-V interface | Accepts 5-V TTL inputs while powered from 3.3-V rail-enables seamless bridging between legacy and modern logic families |
| Hot-insertion support | Ioff and power-up 3-state prevent damaging current flow and bus contention during live board replacement |
| Integrated bus-hold | Eliminates external biasing components on all eight data inputs-reduces BOM count and PCB area |
| Low output ground bounce | VOLP < 0.8 V at VCC = 3.3 V ensures clean signal integrity during heavy switching transients |
| Military temperature grade | Qualified per MIL-PRF-38535 for −55°C to 125°C operation-certified for aerospace, defense, and harsh-environment systems |
Applications
| Aerospace Data Bus Interface | High-Reliability Test Equipment |
|---|---|
Use Scenario: Interfacing 5-V sensor subsystems to a 3.3-V flight computer data acquisition module in a satellite payload. IC Role / Device Role / Timing Role: Level-translating octal buffer isolating noisy analog sensor signals while preserving timing-critical digital handshaking. Use Value: Eliminates discrete level-shifters and pull-up networks, reducing component count by ≥6 parts per channel and improving thermal margin in confined avionics enclosures. | Use Scenario: Signal conditioning and routing in automated test equipment (ATE) mainframe backplanes where modules are hot-swapped during calibration. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling dynamic reconfiguration of measurement paths without system reset. Use Value: Ioff and power-up 3-state prevent bus glitches and short-circuits during insertion/removal-extending backplane connector life and avoiding test aborts. |
| Ruggedized Industrial Controller | Military Communications Chassis |
Use Scenario: Isolating programmable logic controller (PLC) I/O expansion slots from the 3.3-V CPU bus in oilfield drilling control cabinets exposed to wide ambient swings. IC Role / Device Role / Timing Role: Octal buffer with bus-hold maintaining stable logic states during EMI-induced input float in electrically noisy motor-drive environments. Use Value: Prevents spurious I/O transitions that could trigger unsafe actuator commands-meeting IEC 61000-4-4 surge immunity requirements without added filtering. | Use Scenario: Interfacing legacy 5-V crypto modules to modern 3.3-V secure comms processors in tactical radio chassis. IC Role / Device Role / Timing Role: Secure, low-jitter data path buffer supporting deterministic encryption/decryption handshaking across voltage domains. Use Value: Guaranteed −55°C to 125°C operation and 2000-V HBM ESD rating ensure uninterrupted cryptographic key exchange in desert or arctic deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54LVTH244J | Noninverting octal buffer with identical pinout, but no bus-hold circuitry | Requires external pullup/pulldown resistors on all inputs; unsuitable for floating-bus scenarios | Select only if bus-hold is unnecessary and external biasing is acceptable in the design |
| SNJ54ACT240J | 5-V-only CMOS octal inverting buffer; no 5-V-tolerant inputs on 3.3-V supply | Cannot interface directly to 5-V sources without level translation; higher static power | Choose only for legacy 5-V-only systems where voltage translation is already implemented |
Compared with SNJ54LVTH244J and SNJ54ACT240J, SNJ54LVTH240 uniquely combines 5-V input tolerance, integrated bus-hold, and military-grade temperature performance-making it the sole option for hot-swappable, floating-input, mixed-voltage backplane designs requiring zero external bias components.
Availability
SNJ54LVTH240 is available at Aetrix Electronics and suitable for aerospace data bus interfaces, high-reliability test equipment, ruggedized industrial controllers, and military communications chassis requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54LVTH240 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 SNJ54LVTH240 belongs to TI's military-grade ABT logic family, engineered specifically for high-integrity mixed-voltage interfacing in mission-critical systems where reliability, hot-swap capability, and extended temperature operation are mandatory.
FAQ
What is the maximum operating temperature range for SNJ54LVTH240?
The SNJ54LVTH240 is rated for operation from −55°C to 125°C, meeting MIL-PRF-38535 requirements for military and aerospace applications. This full range is validated per the device's qualified temperature testing protocol-not derated or inferred-and applies to all electrical specifications in the datasheet, including propagation delay, drive strength, and bus-hold performance.
Does SNJ54LVTH240 require external pull-up resistors on its inputs?
No, SNJ54LVTH240 does not require external pull-up or pull-down resistors on its data inputs because it integrates active bus-hold circuitry on all eight A-inputs. This feature maintains valid logic states on unused or undriven inputs, eliminating BOM cost and PCB space associated with discrete biasing-confirmed in the device's functional description and electrical characteristics table (II(hold) ±750 μA).
Can SNJ54LVTH240 safely interface a 5-V microcontroller to a 3.3-V FPGA?
Yes, SNJ54LVTH240 safely bridges 5-V microcontrollers to 3.3-V FPGAs: its inputs tolerate up to 7 V (including 5-V TTL levels) while operating from a 3.3-V VCC, and its outputs swing rail-to-rail within the 3.3-V domain. The device's 5-V-tolerant input structure is explicitly verified in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the SCBS679K datasheet.
Is SNJ54LVTH240 pin-compatible with SN74LVTH240 variants?
No, SNJ54LVTH240 is not pin-compatible with commercial SN74LVTH240 variants due to differing package types: SNJ54LVTH240 uses a 20-pin CDIP (J) package with through-hole leads and military temperature qualification, whereas SN74LVTH240 variants use surface-mount packages (SOIC-DW, SSOP-DB, TSSOP-PW, etc.). Pin numbering and mechanical footprint differ fundamentally-no shared PCB layout.
What hot-insertion protections does SNJ54LVTH240 provide?
SNJ54LVTH240 provides two certified hot-insertion protections: Ioff circuitry disables outputs when VCC = 0 V to prevent back-current flow into powered-backplane traces, and power-up 3-state forces outputs into high-impedance during power ramp-up/down-verified in the device's functional description and absolute maximum ratings (Ioff ±100 μA, IOZPU/IOZPD ±100 μA).
SNJ54LVTH240J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SNJ54LVTH240J FAQ
1.How can I place an order for SNJ54LVTH240J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LVTH240J 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 SNJ54LVTH240J reliable?
The price and inventory of SNJ54LVTH240J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LVTH240J is usually 5 days.
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Once your SNJ54LVTH240J 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 SNJ54LVTH240J?
For technical support, including SNJ54LVTH240J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LVTH240J requirements.
6.How does Aetrix verify that SNJ54LVTH240J is sourced from the original manufacturer or authorized distributors?
All SNJ54LVTH240J 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 SNJ54LVTH240J meets industry standards.
7.What is the process for return or replacement of SNJ54LVTH240J?
All SNJ54LVTH240J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LVTH240J, 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 SNJ54LVTH240J part is unused and in its original packaging.
Return procedure for SNJ54LVTH240J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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