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Texas Instruments SNJ54AHC240J
- Part No.:
- SNJ54AHC240J
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54AHC240J.pdf
- Description:
- 54AHC240 OCTAL BUFFERS/DRIVERS W
- Quantity:
- Payment:
- Shipping:
Inventory:170
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Product details
Overview
SNJ54AHC240 from Texas Instruments is a military-grade octal buffer/driver with 3-state outputs, designed for high-density bus interfacing in memory-address, clock, and data transmission systems. It delivers 4.3 ns typical propagation delay at 5 V, supports 2–5.5 V supply operation, and provides ±25 mA output drive per channel across –55°C to +125°C.
For engineers reviewing the SNJ54AHC240 datasheet, SNJ54AHC240 pinout, SNJ54AHC240 application, or SNJ54AHC240 equivalent, this device is selected for high-speed, low-power, 3-state bus driving in aerospace, defense, and ruggedized industrial control where latch-up immunity (>250 mA) and wide temperature operation are critical.
Technical Context
The SNJ54AHC240 implements two independent 4-bit non-inverting buffers, each controlled by a dedicated output-enable (OE) input. Its CMOS AHC logic family ensures rail-to-rail output swing, 5.5 V-tolerant inputs, and balanced rise/fall times under light loads.
It operates in three functional states per channel: pass-through (OE low), high-impedance (OE high), and power-down safe mode when OE is pulled to VCC via external resistor. Input transition rate is specified up to 100 ns/V at 5 V, supporting clean signal integrity in fast-switching applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 5.5 V - enables interoperability with 2.5 V, 3.3 V, and 5 V logic domains |
| Propagation Delay (tPLH/tPHL) | 3.6 ns typ. at 5 V, CL = 15 pF - supports >100 MHz bus timing margins |
| Output Drive Current | ±25 mA per output - drives multiple TTL/CMOS loads or short PCB traces without buffering |
| Input Voltage Tolerance | Up to 5.5 V regardless of VCC - allows level translation from higher-voltage controllers into lower-VCC systems |
| Operating Temperature | –55°C to +125°C - qualified for extended military and aerospace environmental stress profiles |
| Latch-up Immunity | >250 mA per JESD 17 - prevents destructive latch-up during transient overvoltage or ESD events |
| ESD Rating (HBM) | ±2000 V - meets standard handling requirements for military assembly environments |
Pinout & Package
SNJ54AHC240 is supplied in a 20-pin Ceramic Dual-In-Line Package (CDIP, J package), measuring 24.2 mm × 7.62 mm (body: 24.2 mm × 6.92 mm), with through-hole mounting and SNPB (tin-lead) lead finish for military reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of each 4-bit buffer group; high = outputs in high-Z state |
| 1A1–1A4, 2A1–2A4 | Buffer input | Eight non-inverting digital inputs; 5.5 V tolerant regardless of VCC |
| 1Y1–1Y4, 2Y1–2Y4 | Buffer output | Eight 3-state CMOS outputs; ±25 mA drive capability per pin |
| VCC | Power supply | Single positive supply (2–5.5 V); requires local 0.1 µF bypass capacitor |
| GND | Ground reference | Common return path for all I/O and supply currents; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Low propagation delay | 4.3 ns typical at 25°C, 5 V - minimizes timing skew in synchronous bus architectures |
| Rail-to-rail output swing | VOL ≤ 0.36 V at 4 mA, VOH ≥ 2.58 V at –4 mA (3 V supply) - ensures robust noise margin in mixed-signal systems |
| High drive strength | ±25 mA per output - eliminates need for external drivers in point-to-point or lightly loaded stubbed buses |
| Wide supply range | 2 V to 5.5 V operation - supports legacy 5 V and modern low-voltage embedded subsystems |
| Input overvoltage tolerance | Inputs accept up to 5.5 V even at VCC = 2 V - enables seamless interface between disparate voltage domains |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating address signals and enabling time-multiplexed access. Use Value: Prevents bus contention during chip-select transitions and maintains signal integrity across 10+ cm trace lengths at 25 MHz. |
Use Scenario: Distributing a system clock to multiple peripheral ICs while maintaining edge fidelity. IC Role / Device Role / Timing Role: Low-skew, high-drive fanout buffer with configurable enable for clock gating. Use Value: Delivers sub-5 ns delay and <1 ns output skew, reducing jitter accumulation in multi-clock-domain systems. |
| Defense Avionics Data Bus | Rugged Industrial Control I/O |
|
Use Scenario: Interfacing flight computer outputs to MIL-STD-1553 or ARINC-429 transceivers requiring clean, isolated logic levels. IC Role / Device Role / Timing Role: Signal conditioning and isolation layer between processor and protocol-specific PHY. Use Value: Operates reliably across –55°C to +125°C and withstands >250 mA latch-up events common in aircraft power transients. |
Use Scenario: Buffering PLC CPU outputs to relay driver stages or analog front-end multiplexers in factory automation cabinets. IC Role / Device Role / Timing Role: Robust 3-state interface ensuring deterministic I/O state during firmware updates or watchdog resets. Use Value: High ESD immunity (±2 kV HBM) and 5.5 V input tolerance prevent field failures caused by induced noise on long I/O harnesses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHC240N | Commercial-grade (–40°C to +85°C), PDIP-20, RoHS-compliant NiPdAu finish | Not qualified for military temperature or reliability testing; unsuitable for aerospace deployment | Select for cost-sensitive industrial or test equipment where extended temperature is not required |
| SNJ54ACT240J | TTL-compatible input thresholds (VIH = 2 V min), same CDIP-20 package, identical military temp range | Higher ICC (40 µA max vs. 4 µA), slower propagation (6 ns typ.), less noise-immune inputs | Choose only when interfacing legacy TTL logic; otherwise prefer AHC for speed and power efficiency |
Compared with SNJ54AHC240, SN74AHC240N lacks military qualification and thermal range but offers RoHS compliance and lower unit cost, while SNJ54ACT240J trades speed and static power for TTL-level compatibility-neither is pin-compatible nor drop-in replaceable without validation.
Availability
SNJ54AHC240 is available at Aetrix Electronics and suitable for aerospace avionics, defense electronics, and ruggedized industrial control requiring stable component supply across extended lifecycle commitments.
Supply support for SNJ54AHC240 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 logic solutions for industrial, automotive, and defense markets.
The SN54AHC240 product line delivers military-qualified, high-speed CMOS buffers optimized for mission-critical bus interfacing, clock distribution, and memory addressing in harsh-environment systems.
FAQ
What is the operating temperature range of the SNJ54AHC240?
The SNJ54AHC240 is rated for operation from –55°C to +125°C, meeting military specification requirements for extreme environmental conditions. This range is validated per MIL-PRF-38535 and applies to the CDIP (J) package variant. The device maintains full electrical performance-including propagation delay, drive strength, and noise immunity-across this entire span without derating.
Does the SNJ54AHC240 support 3.3 V logic systems?
Yes, the SNJ54AHC240 fully supports 3.3 V operation: it functions correctly with VCC = 3.3 V ± 0.3 V, delivers 4 mA output drive at –4 mA IOH, and exhibits 5.3 ns typical propagation delay (CL = 15 pF). Its 5.5 V-tolerant inputs allow direct connection to 5 V controllers without level-shifting circuitry, making it ideal for mixed-voltage board designs.
How does the output-enable function work on the SNJ54AHC240?
The SNJ54AHC240 features two independent active-low output-enable inputs: 1OE controls Y1–Y4, and 2OE controls Y5–Y8. When an OE pin is low, its corresponding four outputs pass the A-input values; when high, those outputs enter high-impedance state. To ensure defined high-Z during power-up, TI recommends pulling OE to VCC via a resistor sized per the driver's sink current capability.
Is the SNJ54AHC240 pin-compatible with other AHC240 variants?
No-SNJ54AHC240 (CDIP-20, J package) shares identical pinout and logic function with SN54AHC240 but differs physically from commercial SN74AHC240 variants (e.g., SOIC, TSSOP, PDIP), which use different footprints and thermal characteristics. While electrical behavior is consistent across the AHC240 family, mechanical compatibility requires matching the exact package type (J) for drop-in replacement.
What is the maximum capacitive load the SNJ54AHC240 can drive reliably?
The SNJ54AHC240 is characterized up to 50 pF load capacitance, with switching parameters guaranteed for CL = 15 pF and CL = 50 pF. At 5 V supply, tPLH/tPHL increases from 3.6 ns (15 pF) to 5.1 ns (50 pF). For reliable operation beyond 50 pF, external series termination or reduced edge rates are recommended to avoid ringing and overshoot on long or unterminated traces.
SNJ54AHC240J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54AHC
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SNJ54AHC240J FAQ
1.How can I place an order for SNJ54AHC240J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54AHC240J 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 SNJ54AHC240J reliable?
The price and inventory of SNJ54AHC240J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AHC240J is usually 5 days.
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SNJ54AHC240J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54AHC240J 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 SNJ54AHC240J?
For technical support, including SNJ54AHC240J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AHC240J requirements.
6.How does Aetrix verify that SNJ54AHC240J is sourced from the original manufacturer or authorized distributors?
All SNJ54AHC240J 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 SNJ54AHC240J meets industry standards.
7.What is the process for return or replacement of SNJ54AHC240J?
All SNJ54AHC240J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AHC240J, 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 SNJ54AHC240J part is unused and in its original packaging.
Return procedure for SNJ54AHC240J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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