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Texas Instruments SNJ54LS02FK
- Part No.:
- SNJ54LS02FK
- Manufacturer:
- Texas Instruments
- Category:
- Gates and Inverters
- Package:
- 20-CLCC
- Datasheet:
-
SNJ54LS02FK.pdf
- Description:
- IC GATE NOR 4CH 2-INP 20LCCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,332
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Product details
Overview
SNJ54LS02FK from Texas Instruments is a military-grade quad 2-input NOR gate IC in hermetically sealed LCCC-20 package, operating across -55°C to +125°C. It delivers TTL-compatible logic levels, 15 ns typical propagation delay (tPLH/tPHL), 16 mA output drive capability, and is qualified per MIL-PRF-38535 Class B for high-reliability aerospace and defense systems.
For engineers reviewing the SNJ54LS02FK datasheet, SNJ54LS02FK pinout, SNJ54LS02FK application, or SNJ54LS02FK equivalent, this page provides verified electrical specifications, military-grade thermal and packaging data, LCCC-20 terminal mapping, and direct alternatives with documented functional and qualification differences.
Technical Context
The SNJ54LS02FK implements four independent 2-input NOR gates using low-power Schottky (LS) TTL technology. Each gate features standard TTL input thresholds (VIL = 0.8 V, VIH = 2.0 V) and output voltage levels (VOL ≤ 0.5 V at IOL = 16 mA, VOH ≥ 2.7 V at IOH = 0.4 mA).
It operates from a single 5 V ± 5% supply, draws 19 mA maximum ICC (per gate), and maintains full functionality over its extended military temperature range without derating. The LCCC-20 ceramic package ensures hermeticity, zero moisture sensitivity (MSL N/A), and compatibility with high-reliability board assembly processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Low-Power Schottky (LS) TTL - enables interoperability with legacy 74LS and 54LS systems while reducing power vs standard TTL. |
| Function | Quad 2-input NOR gate - provides four independent Boolean OR-NOT logic functions in one package for compact combinatorial logic design. |
| Propagation Delay | 15 ns typical (VCC = 5 V, TA = 25°C) - supports reliable operation in synchronous digital systems up to ~30 MHz clock domains. |
| Output Drive | 16 mA sink / 0.4 mA source - sufficient to directly drive multiple TTL inputs or small LEDs without external buffers. |
| Operating Temperature | -55°C to +125°C - certified for use in avionics, missile guidance, and space-qualified ground support equipment. |
| Supply Voltage | 5 V ± 5% - requires stable regulated rail; no internal regulation or wide-VCC support. |
| Package | LCCC (FK), 20-terminal ceramic - hermetically sealed, leadless, RoHS-exempt (SNPB finish), MSL N/A, suitable for high-vacuum and radiation-prone environments. |
Pinout & Package
LCCC (FK) is a 20-terminal leadless ceramic chip carrier with 1.27 mm pitch, 8.89 mm × 8.89 mm body, and 2.03 mm max height. Terminals are arranged in a square grid (5×5), with Pin 1 located at top-left corner (quadrant Q1), and all terminals serving as I/O or power connections - no dedicated ground plane or thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 11, 12 | NOR Gate Inputs (A/B) | Eight total inputs across four gates; each pair (e.g., Pins 1&2 → Gate 1) accepts standard TTL logic levels. |
| 3, 6, 10, 13 | NOR Gate Outputs (Y) | Four active-low outputs; each drives up to 16 mA sink current into grounded loads or TTL inputs. |
| 7, 14 | VCC | Two dedicated 5 V supply pins - required for decoupling near both ends of the package to minimize switching noise. |
| 15, 16, 18, 19 | GND | Four ground terminals - provide low-inductance return paths for all gates and enable robust noise immunity in high-speed layouts. |
| 20 | No Connect (NC) | Unused terminal; must remain unconnected and unbonded per TI specification to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-38535 Class B Qualification | Guarantees screening for burn-in, temperature cycling, and hermeticity - required for flight-critical subsystems. |
| Hermetic LCCC-20 Package | Eliminates moisture ingress risk and enables long-term reliability in humid, high-vibration, or vacuum environments. |
| 15 ns Propagation Delay @ Full Temp Range | Ensures timing predictability across -55°C to +125°C without additional margining or derating. |
| TTL-Compatible Input/Output Levels | Direct drop-in replacement for legacy 54LS02 variants without level-shifting circuitry. |
| Zero Moisture Sensitivity (MSL N/A) | Removes bake-out requirements before reflow, simplifying high-reliability SMT assembly workflows. |
Applications
| Avionics Flight Control Logic | Military Radar Signal Processing |
|---|---|
Use Scenario: Implementing fault-detection voting logic in triple-modular redundant (TMR) flight computers. IC Role / Device Role / Timing Role: NOR gates perform real-time comparison of three sensor outputs to generate majority-vote error flags. Use Value: 15 ns propagation delay ensures sub-microsecond response to sensor discrepancies, meeting DO-254 timing constraints. |
Use Scenario: Pulse shaping and gating in radar pulse generator modules. IC Role / Device Role / Timing Role: NOR gates combine trigger signals and inhibit pulses to define precise transmit window timing. Use Value: Guaranteed -55°C to +125°C operation prevents timing drift during rapid environmental transitions in airborne radar housings. |
| Spacecraft Onboard Telemetry Encoder | Hardened Ground Test Equipment |
Use Scenario: Encoding telemetry status bits prior to downlink in radiation-tolerant satellite subsystems. IC Role / Device Role / Timing Role: NOR gates implement parity generation and status flag masking in command decode logic. Use Value: Hermetic LCCC package prevents latent failure from outgassing or condensation in vacuum storage and launch environments. |
Use Scenario: Stimulus generation and pass/fail evaluation in ATE systems for missile guidance electronics. IC Role / Device Role / Timing Role: NOR gates synchronize test vectors and validate response windows under extreme thermal stress. Use Value: Dual VCC and quadruple GND terminals reduce ground bounce, ensuring measurement repeatability across 10,000+ test cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54LS02J | CDIP-14 package (14-pin ceramic DIP), same electrical specs and MIL-PRF-38535 Class B qualification. | Through-hole mounting only; larger footprint and higher inductance than LCCC-20; unsuitable for high-density or high-frequency PCBs. | Select when legacy through-hole assembly infrastructure exists or when manual prototyping is required. |
| SNJ54LS02W | CFP-14 package (14-pin ceramic flatpack), identical logic function and military qualification, but different pinout and mechanical form factor. | Surface-mount compatible but lacks LCCC's hermeticity assurance and zero-Moisture-Sensitivity advantage; limited thermal dissipation vs LCCC. | Select when CFP-14 footprint is already standardized in existing hardware and vacuum compatibility is not required. |
Compared with SNJ54LS02J and SNJ54LS02W, the SNJ54LS02FK offers superior high-frequency stability due to its symmetric LCCC layout, lower parasitic inductance from dual VCC/quad GND, and guaranteed hermeticity - making it the preferred choice for new designs demanding maximum reliability in harsh environments.
Availability
SNJ54LS02FK is available at Aetrix Electronics and suitable for avionics control units, military radar subsystems, and spacecraft telemetry encoders requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54LS02FK 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 SNJ54LS02FK belongs to TI's military-grade logic family, designed specifically for mission-critical systems where extended temperature operation, hermetic packaging, and MIL-PRF-38535 compliance are mandatory.
FAQ
What is the maximum operating frequency supported by SNJ54LS02FK?
The SNJ54LS02FK does not specify a maximum clock frequency in its datasheet because it is a combinational logic device without an internal clock. Its usable toggle rate is determined by propagation delay: with 15 ns typical tPLH/tPHL, the SNJ54LS02FK supports reliable operation in synchronous systems with clock periods ≥30 ns (i.e., ≤33 MHz). Actual system-level frequency depends on fanout, trace length, and loading.
Is SNJ54LS02FK RoHS compliant?
No, SNJ54LS02FK is not RoHS compliant. It uses SNPB (tin-lead) lead finish and is explicitly marked "No" for RoHS in TI's packaging documentation. This exemption supports solder joint reliability in high-reliability military and aerospace applications where lead-free alternatives may introduce tin whisker or intermetallic growth risks.
Can SNJ54LS02FK be used as a direct replacement for SN74LS02N?
No - SNJ54LS02FK is not a direct replacement for SN74LS02N. While both implement quad 2-input NOR logic, SNJ54LS02FK is a military-grade part (–55°C to +125°C, MIL-PRF-38535 Class B, LCCC-20), whereas SN74LS02N is commercial-grade (0°C to +70°C, PDIP-14, RoHS-compliant). Electrical specs match, but package, qualification, and temperature range differ significantly.
What is the purpose of the NC (No Connect) terminal on SNJ54LS02FK?
Pin 20 on the SNJ54LS02FK is designated NC (No Connect) and must remain unconnected. TI specifies that this terminal is not bonded internally and has no electrical function. Connecting it risks parasitic coupling or unintended current paths. Layout guidelines require leaving Pin 20 unmasked and un-soldered to maintain signal integrity and qualification compliance.
Does SNJ54LS02FK require external decoupling capacitors?
Yes - SNJ54LS02FK requires external ceramic decoupling capacitors. Due to its dual VCC pins (Pins 7 and 14) and high-speed switching, TI recommends placing a 0.1 µF X7R capacitor between each VCC pin and the nearest GND terminal (e.g., Pin 7–Pin 15, Pin 14–Pin 16). This minimizes supply noise and prevents logic glitches during simultaneous output transitions.
SNJ54LS02FK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54LS
- Package/Case:
- 20-CLCC
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- NOR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- 5.4 mA
- Current - Output High, Low:
- 400µA, 4mA
- Input Logic Level - Low:
- 0.7V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 15ns @ 5V, 15pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LCCC (8.89x8.89)
SNJ54LS02FK FAQ
1.How can I place an order for SNJ54LS02FK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LS02FK 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 SNJ54LS02FK reliable?
The price and inventory of SNJ54LS02FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS02FK is usually 5 days.
3.What payment methods are accepted for SNJ54LS02FK?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54LS02FK?
SNJ54LS02FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54LS02FK 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 SNJ54LS02FK?
For technical support, including SNJ54LS02FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS02FK requirements.
6.How does Aetrix verify that SNJ54LS02FK is sourced from the original manufacturer or authorized distributors?
All SNJ54LS02FK 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 SNJ54LS02FK meets industry standards.
7.What is the process for return or replacement of SNJ54LS02FK?
All SNJ54LS02FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS02FK, 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 SNJ54LS02FK part is unused and in its original packaging.
Return procedure for SNJ54LS02FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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